Verfügbarkeit: Polymer processing

Polymer processing: principles and modeling

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Weitere Verfasser:	Agassant, Jean-François (MitwirkendeR), Avenas, Pierre (MitwirkendeR), Carreau, Pierre J. (MitwirkendeR)
Format:	Buch
Sprache:	English
Veröffentlicht:	Munich ; Cincinnati Hanser [2017]
Ausgabe:	2nd edition
Schlagworte:	Verarbeitung Kunststoffverarbeitung Polymere Kunststofftechnik
Online-Zugang:	Inhaltsverzeichnis
Beschreibung:	XLI, 841 Seiten Illustrationen, Diagramme
ISBN:	9781569906057

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Datensatz im Suchindex

_version_	1804177457024073728
adam_text	FOREWORD TO THE ENGLISH EDITION XXVII PREFACE TO THE THIRD FRENCH EDITION....................................................................XXIX ACKNOWLEDGEMENTS.............................................................................................. XXXI INTRODUCTION......................................................................................................... XXXV 1 CONTINUUM MECHANICS: REVIEW OF PRINCIPLES..................................................1 1.1 STRAIN AND RATE-OF-STRAIN TENSOR.......................................................................1 1.1.1 STRAIN TENSOR.......................................................................................... 1 1.1.1.1 PHENOMENOLOGICAL DEFINITIONS ............................................. 1 1.1.1.1.1 EXTENSION (OR COMPRESSION).................................................1 1.1.1.1.2 PURE SHEAR............................................................................2 1.1.1.2 DISPLACEMENT GRADIENT ........................................................ 2 1.1.1.3 DEFORMATION OR STRAIN TENSOR E ...........................................4 1.1.1.4 VOLUME VARIATION DURING DEFORMATION ............................... 5 1.1.2 RATE-OF-STRAIN TENSOR............................................................................ 6 1.1.3 CONTINUITY EQUATION.............................................................................. 7 1.1.3.1 MASS BALANCE........................................................................7 1.1.3.2 INCOMPRESSIBLE MATERIALS .................................................... 8 1.1.4 PROBLEM S................................................................................................8 1.1.4.1 ANALYSIS OF SIMPLE SHEAR FLOW ...........................................8 1.1.4.2 STUDY OF SEVERAL SIMPLE SHEAR FLOWS ................................. 9 1.1.4.2.1 FLOW BETWEEN PARALLEL PLATES (FIGURE 1 .6 ) ......................... 9 1.1.4.2.2 FLOW IN A CIRCULAR TUBE (FIGURE 1.7) .................................. 10 1.1.4.2.3 FLOW BETWEEN TWO PARALLEL D ISKS .................... 10 1.1.4.2.4 FLOW BETWEEN A CONE AND A P LATE ...................................... 11 1.1.4.2.5 COUETTE FLOW............................................ 12 1.1.4.3 PURE ELONGATIONAL FLOW ................................... 12 1.1.4.3.1 SIMPLE ELONGATION .............................................................. 12 1.1.4.3.2 BIAXIAL STRETCHING: BUBBLE INFLATION ................................... 13 1.2 STRESSES AND FORCE BALANCES ........................................................................... 14 1.2.1 STRESS TENSOR ........................................................................................ 14 1.2.1.1 PHENOMENOLOGICAL DEFINITIONS.............................................14 1.2.1.1.1 EXTENSION (OR COMPRESSION) (FIGURE 1.13)...........................14 1.2.1.1.2 SIMPLE SHEAR (FIGURE 1.14) ................................................ 15 1.2.1.2 STRESS VECTOR........................................................................ 15 1.2.1.3 STRESS TENSOR........................................................................16 1.2.1.4 ISOTROPIC STRESS OR HYDROSTATIC P RESSU RE ........................... 17 1.2.1.5 DEVIATORIC STRESS TENSOR ...................................................... 17 1.2.2 EQUATION OF MOTION ....................................... 18 1.2.2.1 FORCE BALANCES...................................................................... 18 1.2.2.2 TORQUE BALANCES.................................................................20 1.2.3 PROBLEM S.............................................................................................. 21 1.2.3.1 SHEAR STRESS AT THE SURFACE OF A TUBE................................21 1.2.3.2 STRESSES IN A SHELL............................................................... 21 1.3 GENERAL EQUATIONS OF MECHANICS..................................................................... 22 1.3.1 GENERAL CASE........................................................................................ 22 1.3.2 INCOMPRESSIBILITY ................................................................................ 23 1.3.3 PLANAR FLOW.......................................................................................... 23 1.3.4 PROBLEM: STRESS TENSOR IN SIMPLE SHEAR FLOW....................................24 1.4 APPENDICES................................. 25 1.4.1 APPENDIX 1: BASIC FORMULAE............................................................... 25 1.4.1.1 CYLINDRICAL COORDINATES ...................................................... 25 1.4.1.2 SPHERICAL COORDINATES .......................................................... 27 1.4.2 APPENDIX 2: INVARIANTS OF A TENSOR ..................................................... 28 1.4.2.1 DEFINITIONS............................................................................28 1.4.2.2 INVARIANTS USED IN FLUID MECHANICS..................................29 REFERENCES..................................................................................................................31 2 RHEOLOGICAL BEHAVIOR OF MOLTEN POLYMERS .......... ........................................ 33 2.1 VISCOSITY: EQUATIONS FOR NEWTONIAN FLUIDS .................................... 33 2.1.1 BASIC EXPERIMENT OF NEWTONIAN BEHAVIOR ............... 33 2.1.1.1 PHENOMENOLOGICAL DEFINITION OF NEWTON (1713) ............... 33 2.1.1.2 EXPERIMENT OF TROUTON: CONCEPT OF ELONGATIONAL VISCOSITY .............................................................................. 34 2.1.2 GENERALIZATION TO THREE DIMENSIONS ................................................... 35 2.1.2.1 CONSTITUTIVE EQUATION ............. . ...................... 35 2.1.2.2 SIMPLE SHEAR FLOW ........................................... 35 2.1.2.3 UNIAXIAL EXTENSIONS FLOW .................................................. 36 2.1.3 MAGNITUDES OF THE FORCES INVOLVED................................. 36 2.1.3.1 UNITS OF VISCOSITY AND ORDERS OF MAGNITUDE ..................... 36 2.1.3.2 REYNOLDS NUMBER................................................................37 2.1.3.3 EFFECT OF GRAVITY ................. 38 2.1.4 NAVIER-STOKES EQUATIONS.......................................................................38 2.1.5 PROBLEM S..............................................................................................39 2.1.5.1 SIMPLE SHEAR FLOW ......................................... 39 2.1.5.2 PLANAR PRESSURE FLOW..........................................................40 2.1.5.3 SUPERPOSITION OF A SIMPLE SHEAR FLOW AND A PLANAR PRESSURE FLOW .................................. 41 2.1.5.4 PRESSURE FLOW IN A TUBE......... . ...........................................43 2.1.5.5 SIMPLE SHEAR BETWEEN TWO PARALLEL DISKS.........................44 2.1.5.6 COUETTE FLOW............................................. 44 2.1.5.7 FLOW IN A DIHEDRON.............................................................46 2.1.5.8 FLOW IN A CONE..................................................................... 47 2.2 SHEAR-THINNING BEHAVIOR ....................... ......... . ............................................ 48 2.2.1 PHENOMENOLOGICAL DESCRIPTION . . .............. 48 2.2.2 RHEOLOGICAL MODELS IN ONE DIMENSION ............................................... 48 2.2.2.1 POWER-LAW M ODEL......................................... 49 2.2.2.2 CROSS MODEL ........ . .............................................................. 50 2.2.2.3 CARREAU MODEL.................................................................... 50 2.2.3 PHYSICAL EXPLANATION OF THE SHEAR-THINNING BEHAVIOR OF POLYMERS. .50 2.2.4 THREE-DIMENSIONAL CONSTITUTIVE EQUATIONS........................................52 2.2.5 APPLICATIONS OF THE POWER LAW TO SIMPLE FLOWS .................. 53 2.2.5.1 SIMPLE SHEAR FLOW ............................................................. 53 2.2.5.2 PRESSURE FLOW IN A TUBE ................. 53 2.2.6 PROBLEMS IN POWER-LAW FLUIDS ................................................... 55 2.2.6.1 SIMPLE SHEAR FLOW BETWEEN PARALLEL PLATES ........................ 55 2.2. OE.2 PRESSURE FLOW IN A TUBE......................................................56 2.2. OE.3 PLANAR PRESSURE FLOW ......................................................... 57 2.2. OE.4 SUPERPOSITION OF A SIMPLE SHEAR FLOW AND A PLANAR PRESSURE FLOW .................................................................... 58 2.2. OE.5 SIMPLE SHEAR FLOW BETWEEN D ISK S......... ........................... 59 2.2.6.6 COUETTE FLOW ............................. 60 2.3 BEHAVIOR OF FILLED POLYMERS.......................................................... ................. 60 2.3.1 RHEOLOGICAL BEHAVIOR OF SUSPENSIONS . .............. 61 2.3.1.1 DILUTE SUSPENSIONS OF SPHERES..........................................61 2.3.1.2 CONCENTRATED SUSPENSIONS OF SPHERES .............................. 62 2.3.1.3 SPECIAL CASE OF FIBERS. ........ ...............................................63 2.3.1.3.1 ORIENTATION................................................ 63 2.3.1.3.2 RHEOLOGICAL BEHAVIOR.........................................................67 2.3.2 YIELD STRESS F LUIDS ...... .......... 68 2.3.3 PROBLEM: PRESSURE FLOW OF A YIELD STRESS FLUID IN A PIPE ................. 71 2.4 VISCOELASTIC BEHAVIOR......................................................................................72 2.4.1 PHYSICAL PHENOMENA.............................................................................72 2.4.1.1 EXTRUDATE SWELL..................................................................72 2.4.1.2 WEISSENBERG EFFECT............................................................. 73 2.4.1.3 TIME-DEPENDENT BEHAVIOR ................................................ 73 2.4.1.3.1 STRESS RETARDATION AND RELAXATION...................................74 2.4.1.3.2 RECOVERY OF DEFORMATION AFTER CESSATION OF STRESS ......... 74 2.4.1.3.3 RESPONSE OF A POLYMER TO A SINUSOIDAL M OTION ................ 75 2.4.2 LINEAR VISCOELASTICITY AND THE MAXWELL M ODEL..................................75 2.4.2.1 GENERAL INFORMATION ON LINEAR VISCOELASTIC MODELS ....... 75 2.4.2.2 BEHAVIOR OF A MAXWELL ELEMENT.........................................77 2.4.2.3 QUALITATIVE INTERPRETATION OF TIME-DEPENDENT PHENOMENA ................................................ 78 2.4.2.3.1 STRESS RELAXATION (FIGURE 2.30)..........................................78 2A2.3.2 STRESS RETARDATION (FIGURE 2.31).......................................78 2A2.3.3 STRAIN RECOVERY.................................................................. 78 2A2.3.4 RESPONSE TO A PERIODIC S TRA IN ...........................................79 2.4.3 NORMAL STRESS DIFFERENCE IN SIMPLE SHEAR..........................................81 2.4.4 EXTRUDATE SWELL.................................................................................... 83 2.4.5 CONVECTED MAXWELL MODEL...................................................................85 2.4.5.1 TRANSIENT BEHAVIOR............................................................ 86 2A5.2 VISCOMETRIC FUNCTIONS ................................................... .86 2A5.3 ELONGATIONAL VISCOSITY ...................................................... 87 2.4.6 VISCOELASTIC DIMENSIONLESS NUMBERS ................................................. 88 2.4.7 PHYSICAL INTERPRETATION OF THE VISCOELASTIC BEHAVIOR OF POLYMER MELTS......................................................................................................88 2.4.7.1 ROUSE MODEL (1953)........................................................... 89 2A7.2 TEMPORARY NETWORK MODELS...............................................90 2A7.3 MODELS OF COOPERATIVE MOTION OF A CHAIN AND ITS NEIGHBORS ...................................... 90 2A7.4 REPTATION MODELS............................................................... 90 2A7.5 POM-POM MODELS ................................................... 91 2.4.8 SOME VISCOELASTIC CONSTITUTIVE EQUATIONS..........................................92 2.4.8.1 DIFFERENT TYPES OF VISCOELASTIC CONSTITUTIVE EQUATIONS . .92 2.4.8.1.1 EQUATIONS WITH MEMORY FUNCTION OR INTEGRAL CONSTITUTIVE EQUATIONS ....................................................... 9,2 2.4.8.1.2 DIFFERENTIAL CONSTITUTIVE EQUATIONS ................................... 93 2A8.2 CHOICE OF A RHEOLOGICAL MODEL...........................................95 2.4.9 PROBLEMS IN THE CONVECTED MAXWELL MODEL ................... 95 2.4.9.1 MAXWELL FLUID IN SIMPLE SHEAR.........................................95 2A.9.2 SHEAR FLOW OF A MAXWELL FLUID BETWEEN PARALLEL DISKS.. .97 2.4.9.3 COUETTE FLOW OF A MAXWELL FLUID............................... 101 2.4.9.4 STRETCHING OF A MAXWELL FLUID..........................................103 2.5 MEASUREMENT OF THE RHEOLOGICAL BEHAVIOR OF POLYMER MELTS ..................... 108 2.5.1 CAPILLARY RHEOMETER: VISCOSITY MEASUREMENTS ................................ 108 2.5.1.1 PRINCIPLE OF THE MEASUREMENTS ....................................... 108 2.5.1.2 OBTAINING A VISCOSITY C URVE.............................................110 2.5.1.3 INFLUENCE OF TEMPERATURE ................................................. 114 2.5.1.3.1 ARRHENIUS EQUATION ........................................................ 115 2.5.1.3.2 WLF EQUATION..................................................................116 2.5.1.3.3 MASTER CURVES....................................................................117 2.5.1.4 INFLUENCE OF PRESSURE........................................................ 118 2.5.2 SLIT DIE RHEOMETER............................................................................ 119 2.5.3 FLOW WITH A WALL S LIP ........................................................................ 121 2.5.4 CONE-AND-PLATE RHEOMETER.................................................................123 2.5.4.1 PRESENTATION OF THE CONE-AND-PLATE RHEOMETER .............. 123 2.5.4.2 STEADY S HEAR .................................................................... 123 2.5.4.3 OSCILLATORY SHEAR (SAGS) ................................................. 126 2.5.4.4 TRANSIENT MODES...............................................................129 2.5.5 PARALLEL-PLATE RHEOMETER .................................................................. 130 2.5.5.1 STEADY S HEAR.............................................. 130 2.5.5.2 OSCILLATORY SHEAR (SAGS) . . ...............................................130 2.5.6 ELONGATIONAL RHEOMETRY .......... . ........................................................ 131 2.5.6.1 DIFFICULTIES IN ELONGATIONAL VISCOSITY MEASUREMENTS. . . 131 2.5. OE.2 ELONGATIONAL RHEOMETERS ................................................ 132 2.5. OE.3 OTHER MEASUREMENT METHODS.........................................133 2.5.6.3.1 ISOTHERMAL STRETCHING.......................................................134 2.5. OE.3.2 CONVERGING FLOWS............................................................134 2.5.7 NOTIONS OF RHEO-OPTICS ...................................................................... 135 2.5.7.1 FLOW BIREFRINGENCE . . ........................................................ 136 2.5.7.1.1 MEASUREMENT PRINCIPLE AND EXPERIMENTAL SETUP .......... 136 2.5.7.1.2 EXAMPLE OF EXPERIMENTAL RESULTS....................................138 2.5.7.2 LASER DOPPLER VELOCIMETRY .............................................. 140 2.5.7.2.1 MEASUREMENT PRINCIPLE AND EXPERIMENTAL SETUP .......... 140 2.5.7.2.2 EXAMPLE OF RESULTS ............................... 141 2.5.8 PERSPECTIVE............................... 142 2.6 APPENDICES........................................... . . ......................................................142 2.6.1 APPENDIX 1: PHYSICS OF VISCOSITY .............. 142 2.6.1.1 EYRING THEORY .................... 142 2.6.1.2 MOLECULAR WEIGHT DEPENDENCE OF THE VISCOSITY OF POLYMERS .......................................................................... 144 2.6.1.2.1 VISCOSITY OF POLYMERS HAVING A MOLECULAR WEIGHT LESS THAN MC .....................................................................145 2.6.1.2.2 VISCOSITY OF POLYMERS HAVING A MOLECULAR WEIGHT HIGHER THAN MC ................................................................. 147 2.6.1.3 FREE VOLUME THEORY........................................................ 148 2.6.2 APPENDIX 2: AN APPROACH TO VISCOELASTICITY: ELASTIC DUMBBELL MODEL.....................................................................149 2.6.2.1 INTEREST OF THE DUMBBELL MODELS......................................149 2.OE.2.2 MODEL DESCRIPTION............................................................150 2.6.2.3 DUMBBELL IN SIMPLE SHEAR ............................................... 151 2.6.2.3.1 HYDRODYNAMIC ACTIONS ..................................................... 151 2.6.2.3.2 FORCE DUE TO BROWNIAN MOTION ........ ................................. 152 2.OE.2.3.3 BALANCE OF FORCES AND CONSERVATION OF THE NUMBER OF MOLECULES...........................................................................152 2.OE.2.3.4 AVERAGE DEFORMATION OF THE MACROMOLECULE ................. 153 2.OE.2.3.5 COMMENTS............................................................. 154 2.6.2.4 MACROMOLECULE DEFORMATION IN COMPLEX FLOW S.............154 2.6.2.5 MACROMOLECULE DEFORMATION IN PLANAR EXTENSION ......... 156 2.6.2.OE CONCLUDING R EM ARKS ...................................................... 157 2.6.3 APPENDIX 3: MATERIAL AND CONVECTED DERIVATIVES...........................158 2.6.3.1 SUBSTANTIAL OR MATERIAL DERIVATIVE OF A T ENSOR ............. 158 2.OE.3.2 CONVECTED DERIVATIVE OF A TENSOR...................................158 2.OE.3.3 SPECIAL CASE OF THE ROTATION OF A DISK ABOUT ITS AXIS .. .160 2.6.4 APPENDIX 4: RABINOWITSCH CORRECTION (RABINOWITSCH, 1929)...........162 2.6.5 APPENDIX 5: FLOW OF A VISCOELASTIC FLUID IN A CONE-AND-PLATE GEOMETRY............................................................................................ 163 2.6.5.1 KINEMATICS HYPOTHESES ................ 164 2.OE.5.2 VISCOMETRIC FUNCTIONS .................................................... 165 2.6.5.3 DYNAMIC EQUILIBRIUM OF THE SYSTEM...............................165 2.OE.5.4 SMALL CONE ANGLE LIMIT............................ 166 2.6.6 APPENDIX 6: VISCOMETRIC FLOWS ....................................... 168 REFERENCES................................................................................................................169 3 ENERGY AND HEAT TRANSFER IN POLYMER P RO CESSES ..................................... 177 3.1 BASIC NOTIONS ON HEAT TRANSFER.................................................................... 177 3.1.1 FIRST LAW OF THERMODYNAMICS ...................................... 177 3.1.2 HEAT RECEIVED BY THE SYSTEM............................................................. 178 3.1.3 POWER GENERATED BY INTERNAL FORCES ................................................. 178 3.1.3.1 WORK DONE BY DEFORMATION ..................... 178 3.1.3.1.1 EXTENSION OR COMPRESSION................................................178 3.1.3.1.2 SIMPLE SHEAR ......................... 179 3.1.3.2 GENERALIZATION ........... . .......................................................179 3.1.3.3 POWER GENERATED BY INTERNAL FORCES (DISSIPATED POWER) 179 3.1.3.4 NEWTONIAN AND SHEAR-THINNING, POWER-LAW LIQUIDS ---- 180 3.1.4 EQUATION OF ENERGY.............................................................................180 3.1.5 INTERNAL ENERGY .................................... 181 3.1.5.1 TEMPERATURE-DEPENDENT INTERNAL ENERGY, E .................... 181 3.1.5.2 COMPRESSIBLE MATERIALS . ...................................................184 3.1.5.3 CHANGE OF STATE OR CHEMICAL REACTION ........................... 184 3.1.6 BOUNDARY CONDITIONS .............. 185 3.1.6.1 MATHEMATICAL CONDITIONS .................................................. 185 3.1.6.2 CONDITIONS DEPENDING ON THE ENVIRONMENT ................... 185 3.1.6.2.1 POLYMER IN CONTACT WITH A METALLIC SURFACE .................... 185 3.1.6.2.2 POLYMER IN CONTACT WITH A FLUID (AIR OR WATER) .............. 188 3.1.7 SOLUTIONS OF THE HEAT TRANSFER EQUATION.........................................189 3.2 COOLING IN MOLDS, IN AIR, AND IN WATER . .. ......... .......................................... 190 3.2.1 CONTEXT ................................................................. 190 3.2.2 HEAT TRANSFER EQUATION . . ................ 190 3.2.2.1 BODY AT REST ............................. 190 3.2.2.2 BODY IN MOTION .............................. 191 3.2.3 HEAT PENETRATION THICKNESS ................... 191 3.2.4 INTERFACIAL TEMPERATURE....................... 193 3.2.4.1 CONDUCTIVE HEAT TRANSFER: NOTION OF EFFUSIVITY..............193 3.2.4.2 CONDUCTIVE AND CONVECTIVE HEAT TRANSFER ...................... 196 3.2.5 HEATING (OR COOLING) OF A PLATE ...................................... 198 3.2.5.1 ISOTHERMAL BOUNDARY CONDITIONS ....... . ......................... 198 3.2.5.1.1 EXACT SOLUTION ................................................................ .198 3.2.5.1.2 APPROXIMATE SOLUTION....................................................... 199 3.2.5.2 CONVECTIVE BOUNDARY CONDITIONS ................................... 200 3.2.5.2.1 EXACT SOLUTION ......................................................... 200 3.2.5.2.2 APPROXIMATE SOLUTION. ............ ..................... 202 3.3 POLYMER FLOW AND HEAT TRANSFER........................................... . ..................... 203 3.3.1 IMPORTANCE OF VISCOUS HEATING: THE BRINKMAN NUMBER ................ 204 3.3.2 NOTION OF A THERMAL REGIME.................................................... 204 3.3.3 THE EQUATIONS.................................................... 205 3.3.3.1 ENERGY EQUATION ............... 205 3.3.3.2 CALCULATION OF THE DISSIPATED HEAT, W ............................206 3.3.3.2.1 NEWTONIAN BEHAVIOR .......... ... .........................................206 3.3.3.2.2 SHEAR-THINNING, POWER-LAW BEHAVIOR..............................206 3.3.4 EQUILIBRIUM REGIME . .............................. 207 3.3.4.1 EQUILIBRIUM REGIME FOR A NEWTONIAN POLYMER .............. 207 3.3.4.1.1 CONSTANT TEMPERATURE AT THE WALLS, T(R) - TW ................ 207 3.3.4.1.2 CONVECTIVE BOUNDARY CONDITION ..................................... 208 3.3.4.2 EQUILIBRIUM REGIME FOR A POWER-LAW POLYMER AND A CONSTANT WALL TEMPERATURE ............................................. 210 3.3.5 ADIABATIC REGIME.............................................................................. 211 3.3.6 TRANSITION REGIME FOR A NEWTONIAN FLUID ......................................... 213 3.3.6.1 AVERAGE TEMPERATURE WITH A CONVECTIVE BOUNDARY CONDITION .......................................................................... 213 3.3.OE.2 EVALUATION OF THE NUSSELT NUMBER (OR OF THE HEAT TRANSFER COEFFICIENT)................................214 3.3.6.2.1 EXPRESSION FOR NUE(?...........................................................214 3.3.6.2.2 CONTROL TEMPERATURE EQUAL TO THE INITIAL POLYMER TEMPERATURE.....................................................................215 3.3.6.2.3 CONTROL TEMPERATURE DIFFERENT FROM THE INITIAL POLYMER TEMPERATURE .............................................. 216 3.3.7 TRANSITION REGIME WITH A POWER-LAW FLUID ..................................... 219 3.3.8 COMPARISON WITH AN EXACT SOLUTION ................................................. 220 3.3.8.1 CALCULATIONS WITHOUT MECHANICAL-THERMAL COUPLING.. .220 3.3.8.1.1 NEWTONIAN POLYMER...........................................................220 3.3.8.1.2 SHEAR-THINNING POLYMER...................................................223 3.3.5.2 COMPUTATIONS WITH THERMAL COUPLING............................224 3.3.9 OTHER FLOW GEOMETRIES ...................................................................... 224 3.3.9.1 SIMPLE SHEAR FLOW BETWEEN PARALLEL PLATES .................... 224 3.3.9.1.1 THERMAL EQUILIBRIUM REGIME ......................................... 225 3.3.9.1.2 ADIABATIC REGIME.............................................................226 3.3.9.1.3 TRANSITION REGIME ................................ 226 3.3.9.2 HEAT GENERATION IN PLANAR PRESSURE FLOW ..................... 227 3.3.10 APPLICATION TO FLAT DIE EXTRUSION.................................................... 228 3.3.11 CONCLUSION.................. ................................................... ................... 231 3.4 APPENDICES.................................................................................................... 231 3.4.1 APPENDIX 1: CONVECTIVE HEAT TRANSFER ............................................. 231 3.4.1.1 FREE AND FORCED CONVECTION.............................................231 3.4.1.2 THE BENARD PROBLEM......................................................... 232 3.4.1.2.1 DESCRIPTION OF THE EXPERIMENTS ....................................... 232 3.4.1.2.2 DETERMINATION OF ATC (RAYLEIGH, 1916)............................233 3.4.1.3 HEAT TRANSFER BY FREE CONVECTION ................................... 235 3.4.1.3.1 GENERAL PRINCIPLES ...................................... 235 3.4.1.3.2 HORIZONTAL CYLINDER.........................................................235 3.4.1.3.3 VERTICAL PLATE OR CYLINDER.................................................236 3.4.1.3.4 HORIZONTAL PLATE................................................................ 236 3.4.1.4 EXAMPLE: DETERMINATION OF THE HEAT TRANSFER COEFFICIENT IN FREE CONVECTION...........................................................237 3.4.1.4.1 INTRODUCTION......................................................................237 3.4.1.4.2 PHYSICAL PROPERTIES OF AIR AND W ATER ............................. 238 3.4.1.4.3 EXAMPLE .............................................. 239 3.4.1.5 FORCED CONVECTION ............................................................ 239 3.4.1.5.1 INTRODUCTION ...................................................................... 239 3.4.1.5.2 GENERAL RELATIONSHIPS....................................................... 240 3.4.1.5.3 SPHERE ........... .................................................................. 240 3.4.1.5.4 CYLINDER PERPENDICULAR TO THE FLOW STREAM ................... 240 3.4.1.5.5 PLATE OR CYLINDER PARALLEL TO THE FLOW STREAM ............... 240 3.4.1.5.6 EXAMPLE: DETERMINATION OF THE HEAT TRANSFER COEFFICIENT IN FORCED CONVECTION.......................................................241 3.4.2 APPENDIX 2: RADIATION HEAT TRANSFER ............................................... 242 3.4.2.1 BLACKBODY ....................................................................... 242 3.4.2.2 NONBLACKBODIES ................................................................ 243 3.4.2.2.1 ABSORPTION OF NONBLACKBODIES ......................................... 243 3A2.2.2 RADIATION EMITTED BY A NONBLACKBODY ........................... 243 3.4.2.3 RADIATION HEAT EXCHANGE BETWEEN GRAY BODIES .............. 244 3.4.2.3.1 GENERALITIES...................................................................... 244 3.4.2.3.2 EXAMPLES.............................................. 245 3.4.2.4 DETERMINATION OF RADIATION HEAT TRANSFER COEFFICIENT. .246 3.4.3 APPENDIX 3: INTERNAL ENERGY FOR COMPRESSIBLE M ATERIALS .............. 246 REFERENCES......................... 248 4 APPROXIMATIONS AND CALCULATION METHODS ......... ........................................ 251 4.1 EQUATIONS FOR POLYMER PROCESSING ...................... 251 4.2 CHOICE OF A RELEVANT RHEOLOGICAL CONSTITUTIVE EQUATION..............................253 4.3 CHOICE OF BOUNDARY CONDITIONS ................... 255 4.3.1 KINEMATICS BOUNDARY CONDITIONS.....................................................255 4.3.2 HEAT TRANSFER BOUNDARY CONDITIONS.................................................256 4.3.3 INLET CONDITIONS..................................................................................256 4.3.4 EXIT CONDITIONS....................... 256 4.4 APPROXIMATION METHODS....................... 257 4.4.1 APPROXIMATIONS CONCERNING THE GEOMETRY OF THE FLOW ...... .. ..........257 4.4.1.1 UNWINDING OR FLATTENING OF AN ANNULAR OR A HELICAL GEOMETRY ............................ 257 4.4.1.2 DECOMPOSITION OF COMPLEX FLOW GEOMETRY IN SEVERAL SIMPLE FLOWS.................................................................... 258 4.4.2 KINEMATICS APPROXIMATIONS .......................................... 259 4.4.2.1 LUBRICATION APPROXIMATIONS ........................................... 259 4.4.2.2 HELE-SHAW APPROXIMATIONS .......... ...................................260 4.4.2.3 APPROXIMATION OF A SLENDER BODY (OR THIN FILM) ............ 263 4A.2.4 IMPORTANT REMARK.............................................................. 265 4.4.3 APPROXIMATIONS FOR THE TEMPERATURE ............................................... 265 4.4.4 CONCLUSION AND APPLICATION EXAMPLE ............................................... 266 4.4.5 PROBLEMS............................................................................................ 268 4.4.5.1 FLOW IN A DIHEDRON...........................................................268 4.4.5.2 FLOW IN A CONE...................................................................271 4.5 PRESSURE BUILDUP IN POLYMER FLOWS: HYDRODYNAMICS BEARINGS..................272 4.5.1 INTRODUCTION........................................................................................ 272 4.5.2 QUALITATIVE ANALYSIS OF SOME HYDRODYNAMICS BEARINGS ................... 273 4.5.2.1 RAYLEIGH BEARING................................................................273 4.5.2.2 REYNOLDS B EARING.............................................................273 4.5.2.3 FLOW BETWEEN TWO ROLLS ................................................... 274 4.5.3 PRESSURE GENERATED BY A SUDDEN FLOW RESTRICTION (RAYLEIGH B EARING) ............................................................................ 275 4.5.4 FLOW CALCULATION IN A BEARING OF VARIABLE GAP: THE REYNOLDS EQUATION . ......................................................................276 4.5.5 PROBLEM: REYNOLDS BEARING...............................................................277 4.6 CALCULATION METHODS......................................................................................279 4.6.1 CALCULATION METHODS AS FUNCTIONS OF THE TYPE OF FLOW .................... 279 4.6.1.1 SIMPLE SHEAR OR SIMPLE STRETCHING ISOTHERMAL FLOWS.. .279 4.6.1.2 UNIDIRECTIONAL ISOTHERMAL FLOWS ......... ........................... 279 4.6.1.3 NONISOTHERMAL SHEAR OR ELONGATION UNIDIRECTIONAL FLOW S................................................................................ 280 4.6.1.4 BIDIRECTIONAL THIN LAYER FLOWS (ISOTHERMAL OR NONISOTHERMAL) ....................................... 280 4.6.1.5 2D OR 3D FLOWS.................................................................. 280 4.6.2 SOLUTION OF UNIDIRECTIONAL FLOWS: SLAB METHOD (OR INCREMENTAL M ETHOD)...................................................................281 4.6.3 SOLUTION OF THE HELE-SHAW EQUATIONS ..................... 282 4.6.3.1 NEWTONIAN ISOTHERMAL CASE ............................................. 282 4.6.3.2 NON-NEWTONIAN ISOTHERMAL VISCOUS CASE........................284 4.OE.3.3 NONISOTHERMAL CASE (AVERAGE TEMPERATURE SOLUTION) . .285 4.6.4 2D AND 3D VISCOUS FLOW CALCULATIONS WITH A FINITE ELEMENTS METHOD................................................................................................287 4.6.4.1 MECHANICAL EQUATIONS ...................................................... 287 4.OE.4.2 MESHING......................................................... 287 4.6.4.3 FINITE ELEMENTS SOLUTION ............ .....................................289 4.6.4.4 FINITE ELEMENTS SOLUTION OF THE ENERGY EQUATION ........... 290 4.6.5 ISOTHERMAL FLOW VISCOELASTIC COMPUTATIONS ................................... 292 4.6.5.1 DIRECT SOLUTION METHODS .................................................... 292 4.OE.5.2 ITERATIVE M ETHODS.......................................... 293 4.7 APPENDIX........................................................................................................295 4.7.1 APPENDIX 1: ANALYSIS OF THE LUBRICATION APPROXIMATIONS .............. 295 4.7.1.1 INTRODUCTION......................................................................295 4.7.1.2 ANALYSIS OF THE RELATIVE WEIGHT OF THE TERMS OF THE RATE-OF-STRAIN TENSOR ....................................................... 295 4.7.1.3 SIMPLIFICATION OF THE EQUATIONS OF MOTION . ..................... 296 4.7.1.4 VALIDITY OF THE LUBRICATION APPROXIMATIONS .................... 297 REFERENCES...............................................................................................................298 5 SINGLE-SCREW EXTRUSION AND DIE FLOW S ....................................................... 301 5.1 SINGLE-SCREW EXTRUSION .................................................................................. 303 5.1.1 GEOMETRIC AND KINEMATIC DESCRIPTION ............................................. 303 5.1.1.1 THE DIFFERENT ZONES OF THE EXTRUDER ............................... 303 5.1.1.2 GEOMETRY OF THE SCREW .................................................... 304 5.1.1.3 DESCRIPTION OF THE SCREW CHANNEL ................................... 305 5.1.1.4 CLASSICAL APPROXIMATIONS. .............................................. 306 5.1.1.4.1 APPROXIMATION OF A FIXED BARREL AND A ROTATING SCREW .306 5.1.1.4.2 UNWOUND SCREW CHANNEL................................................. 307 5.1.1.4.3 RELATIVE VELOCITY OF THE BARREL.........................................308 5.1.1.5 REFERENCE EXTRUDER.......................................................... 309 5.1.2 FEEDING ZONE......................................................................................309 5.1.2.1 SOLID POLYMER CONVEYING ................................................ 309 5.1.2.2 POLYMER-METAL FRICTION .................................................. 310 5.1.2.3 ARCHIMEDES* SCREW...........................................................311 5.1.2.4 MODEL OF DARNELL AND MOLL (1956) ................................... 313 5.1.2.5 FLOW RATE CALCULATION AND OPTIMIZATION ....................... 315 5.1.2.6 ROLE OF PRESSU RE .................. 317 5.1.2.7 TECHNOLOGICAL CONSEQUENCES ........................................... 319 5.1.2.8 MODEL IMPROVEMENTS.............................................. 320 5.1.3 MELTING ZONE......................................................................................322 5.1.3.1 PHYSICAL DESCRIPTION OF THE PHENOMENA..........................322 5.1.3.1.1 EXPERIMENTAL OBSERVATIONS ............................................. 322 5.1.3.1.2 DELAY ZONE (KACIR AND TADMOR, 1972) ............................... 324 5.1.3.1.3 INITIATION OF THE MELTING BY MELT POOL..............................325 5.1.3.1.4 MELTING MECHANISM BY MELT POOL ................................... 325 5.1.3.2 INITIATION OF THE MELTING PROCESS BY MELT POOL ........ ........ 326 5.1.3.3 MELTING MODEL OF TADMOR AND KLEIN (1970) ................... 328 5.1.3.3.1 MELTING R ATE .................................................................... 328 5.1.3.3.2 CHANGES INDUCED BY THE CLEARANCE BETWEEN THE SCREW AND THE BARREL .......................... 331 5.1.3.3.3 LENGTH OF THE MELTING ZONE; ROLE OF COMPRESSION ......... 332 5.1.3.4 OTHER MODELS.................................................................... 335 5.1.3.5 TECHNOLOGICAL CONSEQUENCES: BARRIER SCREWS................336 5.1.4 FLOW OF THE MOLTEN POLYMER .............................................................. 339 5.1.4.1 PUMPING ZONE.................................................................. 339 5.1.4.1.1 REVIEW OF THE GEOMETRY...................................................340 5.1.4.1.2 FLOW EQUATIONS.................................................................340 5.1.4.1.3 STUDY OF THE TRANSVERSE F LOW ......................................... 341 5.1.4.1.4 STUDY OF THE LONGITUDINAL FLOW ....................................... 343 5.1.4.1.5 CONCEPT OF RESIDENCE TIME DISTRIBUTION ........................ 345 5.1.4.2 COMPRESSION Z O N E .......................................................... 348 5.1.4.3 ROLE OF THE SCREW/BARREL CLEARANCE................................350 5.1.4.4 STUDY OF THERMAL PHENOMENA ......................................... 352 5.1.4.5 CONCEPT OF CHARACTERISTIC CURVES ..................................... 355 5.1.4.6 MODEL IMPROVEMENTS ...................................................... 357 5.1.4.7 TECHNOLOGICAL CONSEQUENCES...........................................358 5.1.4.7.1 DEGASSING EXTRUDERS (TWO-STAGE VENTED SCREWS) .......... 358 5.1.4.7.2 MIXING ELEMENTS .............................................................. 359 5.1.5 OVERALL MODEL OF SINGLE-SCREW EXTRUSION.........................................361 5.1.5.1 INTRODUCTION......................................................................361 5.1.5.2 EXAMPLES OF RESULTS.........................................................361 5.1.5.2.1 REFERENCE EXTRUDER .......................................................... 361 5.1.5.2.2 OPTIMIZATION OF THE PUMPING ZONE ................................. 364 5.1.5.3 CONCLUSIONS...................................................................... 365 5.1.6 EXTRUSION PROBLEM S .......................................................................... 366 5.1.6.1 INITIATION OF THE MELTING BY MELT POOL..............................366 5.1.6.2 MELTING REGIME BY MELT POOL...........................................368 5.1.6.3 CRITERIA FOR CHOOSING AN EXTRUDER ................................... 373 5.2 EXTRUSION DIES............................................................................................... 378 5.2.1 INTRODUCTION: ROLE OF AN EXTRUSION DIE.............................................378 5.2.2 DESCRIPTION OF THE ENCOUNTERED GEOMETRIES ................................... 378 5.2.2.1 FILM-BLOWING DIES ............................................................ 378 5.2.2.2 PIPE D IES .......................................................................... 379 5.2.2.3 PLATE DIES (OR FLAT D IES)................................................... 380 5.2.2.4 PROFILE D IE S ...................................................................... 381 5.2.2.5 WIRE-COATING DIES.............................................................381 5.2.3 ASSUMPTIONS AND CALCULATION METHODS REVISITED ........ ................... 382 5.2.4 EXAMPLES OF RESULTS ...... ....................................................................383 5.2.4.1 FILM-BLOWING DIES.............................................................383 5.2.4.2 PIPE D IES.......................................................................... 388 5.2.4.3 FLAT DIES............................................................................ 392 5.2.4.4 WIRE-COATING DIES.............................................................395 S.2.4.5 PROFILE D IES........................................................................399 5.2.5 CONCLUSION ...................................... 402 5.2.6 DIE PROBLEMS......................................................................................403 5.2.6.1 FLOW IN A FLAT T-DIE...........................................................403 5.2.6.2 FLOW IN A FLAT COAT-HANGER D IE ....................................... 405 5.3 MULTILAYER FLOWS................................................ 408 5.3.1 INTEREST OF MULTILAYER FLOWS AND RELATED PROBLEMS .......................... 408 5.3.2 STUDY OF THE STEADY FLOW OF TWO VISCOUS FLUIDS BETWEEN PARALLEL P LATES................................................................................................. 410 5.3.2.1 CONTINUITY CONDITIONS AT THE INTERFACE ............................. 411 5.3.2.2 ISOTHERMAL NEWTONIAN TWO-LAYER FLOW ..........................411 5.3.2.3 GENERALIZATION TO POWER-LAW BEHAVIOR............................414 5.3.3 FLAT DIE COEXTRUSION.......................................................................... 416 5.3.3.1 PROCESS DESCRIPTION.........................................................416 5.3.3.2 ONE-DIMENSIONAL APPROACH ............................................. 417 5.3.3.3 TWO-DIMENSIONAL APPROACH ............................................. 420 5.3.3.4 TWO-DIMENSIONAL HELE-SHAW APPROACH..........................422 5.3.4 COEXTRUSION DIE PROBLEMS ................................................................ 423 5.3.4.1 THREE-LAYER COEXTRUSION FLOW BETWEEN PARALLEL PLATES .423 5.3.4.2 COEXTRUSION FLOW IN A CAPILLARY ..................................... 425 5.4 APPENDIX ............................................ 426 5.4.1 APPENDIX 1: CALCULATION OF SOLID VELOCITY IN SINGLE-SCREW EXTRUSION........................................................................................... 426 REFERENCES.............................................................................................................. 427 6 TWIN-SCREW EXTRUSION AND APPLICATIONS .................................................... 433 6.1 GENERAL DESCRIPTION OF TWIN-SCREW EXTRUSION PROCESS ............................... 433 6.1.1 DIFFERENT TYPES OF TWIN-SCREW EXTRUDERS ....................................... 433 6.1.2 FLOW TYPES......................................................................................... 434 6.1.3 SPECIFIC FEATURES OF COROTATING TWIN-SCREW EXTRUSION ................... 436 6.1.4 GEOMETRY OF SCREWS AND BARREL ........................................................ 438 6.1.5 CLASSICAL APPROXIMATIONS.................................................................. 442 6.1.6 DIFFERENT MODELING APPROACHES.........................................................443 6.1.7 REFERENCE EXTRUDER............................................................................443 6.2 SOLID CONVEYING AND MELTING........................................................................ 445 6.2.1 SOLID CONVEYING ZONE . . ..................................................................... 445 6.2.2 MELTING ZONE................................................ 447 6.3 MELT FLOW ...................................... 451 6.3.1 RIGHT- AND LEFT-HANDED SCREW ELEMENTS ................ 452 6.3.1.1 ONE-DIMENSIONAL MODELS .................................................. 452 6.3.1.2 TWO-DIMENSIONAL MODELS .................................................. 456 6.3.1.3 THREE-DIMENSIONAL M ODELS.............................................457 6.3.1.4 THERMAL EFFECTS................................................................ 459 6.3.2 MIXING ELEMENTS................................................................................ 460 6.3.2.1 ONE-DIMENSIONAL MODELS.................................................461 OE.3.2.2 TWO-DIMENSIONAL MODELS ................................................ 464 6.3.2.3 THREE-DIMENSIONAL M ODELS ............................................ 467 6.4 GLOBAL MODEL OF TWIN-SCREW EXTRUSION.........................................................469 6.4.1 GENERAL DESCRIPTION .......................................................................... 469 6.4.2 RESIDENCE TIME DISTRIBUTION.............................................................473 6.4.3 EXAMPLES OF RESULTS ......................................................................... 477 6.5 APPLICATION TO THE PRODUCTION OF POLYMER B LENDS ....................................... 481 6.5.1 BASIC MECHANISMS.............................................................................. 481 6.5.1.1 MECHANISMS OF RUPTURE .................................................. 482 6.5.1.2 MECHANISMS OF COALESCENCE .................... 484 6.5.2 MODELING ALONG THE EXTRUDER AND EXAMPLES OF RESULTS ................ 485 6.6 APPLICATION TO COMPOUNDING OPERATIONS.....................................................488 6.6.1 DIFFERENT TYPES OF MIXING.................................................................488 6.6.2 DISTRIBUTIVE MIXING ............................................................................ 489 6.6.3 DISPERSIVE MIXING: APPLICATION TO THE PRODUCTION OF NANOCOMPOSITES............................................................................ 492 6.7 APPLICATION TO REACTIVE EXTRUSION.................................................................499 6.8 OPTIMIZATION AND SCALE-UP ............................................................................ 506 6.9 CONCLUSION......................................................................................................508 6.10 PROBLEM: SIMPLIFIED MODEL OF THE FLOW AROUND A KNEADING DISK ................ 508 REFERENCES ......................... . ................................................................................... 512 7 INJECTION MOLDING............................................................................................. 521 7.1 DESCRIPTION...................................................................... 521 7.2 FILLING STAGE....................................................................................................526 7.2.1 PECULIARITIES OF THE FILLING PHASE....................................................... 526 7.2.2 MAIN HYPOTHESES AND GOVERNING EQUATIONS....................................526 7.2.2.1 PURELY VISCOUS FLOW BEHAVIOR.........................................526 7.2.2.2 INCOMPRESSIBILITY.............................................................527 7.2.2.3 NEGLIGIBLE GRAVITATIONAL AND INERTIAL FORCES ............... .527 7.2.2.4 EQUATIONS .......................................................................... 527 7.2.3 UNIDIRECTIONAL FLOWS .......................................................................... 528 7.2.3.1 INTRODUCTION...................................................................... 52,8 7.2.3.2 FILLING OF A CENTER-GATED DISK M OLD................................529 7.2.3.2.1 NEWTONIAN ISOTHERMAL BEHAVIOR ..................................... 530 7.2.3.2.2 ISOTHERMAL SHEAR-THINNING BEHAVIOR..............................531 7.2.3.2.3 NONISOTHERMAL GENERALIZED NEWTONIAN BEHAVIOR .......... 532 7.2.4 THIN FLOW OR HELE-SHAW M ODELS ....................................................... 540 7.2.5 3D COMPUTATIONS................................................................................ 544 7.3 PACKING AND HOLDING P HASE .......................................................................... 548 7.3.1 INTRODUCTION........................................................................................548 7.3.2 SIMPLIFIED CALCULATIONS OF THE PACKING P HASE..................................549 7.3.3 PHYSICAL DATA FOR THE PACKING-HOLDING CALCULATIONS ...................... 551 7.3.3.1 MEASUREMENTS OF PVT DATA ............................................. 551 7.3.3.2 MODELING............................................................ 552 7.3.4 CALCULATIONS........................................................................................553 7.3.4.1 THIN-FLOW APPROACHES.....................................................553 7.3.4.2 3D COMPUTATIONS...............................................................556 7.3.5 CONCLUSIONS........................................................................................557 7.4 RESIDUAL STRESSES AND DEFORMATIONS ............................................ 558 7.4.1 INTRODUCTION ....................................................................................... 558 7.4.2 MAIN PHYSICAL PHENOMENA INVOLVED ................................................. 558 7.4.2.1 THERMAL SHRINKAGE............................................................558 7.4.2.2 FROZEN-IN STRESSES.............................................................561 7.4.3 MEASUREMENT OF RESIDUAL STRESSES...................................................562 7.4.4 CALCULATIONS OF RESIDUAL STRESSES.....................................................563 7.5 NONSTANDARD INJECTION-MOLDING TECHNIQUES................................................. 564 7.5.1 GAS-ASSISTED INJECTION MOLDING (GAIM) ........................................... 564 7.5.2 WATER-ASSISTED INJECTION MOLDING (WAIM) ....................................... 566 7.5.3 MULTICOMPONENT INJECTION MOLDING...................................................567 7.6 INJECTION OF SHORT FIBER REINFORCED POLYMERS ............................................... 569 7.7 CONCLUSION..................................................................................................... 571 7.8 PROBLEMS......................................................................................................... 572 7.8.1 FILLING OF A CENTER-GATED D ISK .................................................... * 572 7.8.2 BALANCING OF A MULTICAVITY MOLD.......................................................575 REFERENCES.............................................................................................................. 580 8 CALENDERING................................................................................... 587 8.1 INTRODUCTION................................................................................................ .587 8.2 RIGID FILM CALENDERING PROCESS......................... 588 8.2.1 PRESENTATION........................................................................................588 8.2.2 CALENDERING PROBLEMS ...................................................................... 589 8.2.3 AIM OF CALENDERING PROCESS MODELING .......... . ................................. 591 8.2.4 KINEMATICS OF CALENDERING ................... 591 8.2.5 ISOTHERMAL NEWTONIAN MODEL BASED ON LUBRICATION APPROXIMATIONS. . .................... 594 8.2.5.1 REYNOLDS EQUATION...........................................................594 5.2.5.2 SPREAD HEIGHT CALCULATION ........ .......................................594 8.2.5.3 ROLL SEPARATING FORCE AND TORQUE EXERTED ON THE ROLL. .596 8.2.6 MORE GENERAL NEWTONIAN M ODELS ..................................................... 597 8.2.6.1 TWO-DIMENSIONAL MODEL ................................................... 597 8.2.6.2 INFLUENCE OF SLIPPAGE BETWEEN THE POLYMER AND THE ROLLS.................................................................................. 599 8.2.OE.3 CALENDERING ANALYSIS WHEN INTRODUCING A VELOCITY DIFFERENTIAL BETWEEN THE ROLLS ......................................... 600 8.2.6.4 CONCLUSIONS OF THE DIFFERENT NEWTONIAN MODELS ............ 601 8.2.7 SHEAR-THINNING CALENDERING M ODEL ................................................. 601 8.2.7.1 GENERALIZED REYNOLDS EQUATION.........................................602 5.2.7.2 INTEGRATED GENERALIZED REYNOLDS EQUATION .................... 603 8.2.8 THERMAL EFFECTS IN CALENDERING.........................................................604 8.2.9 VISCOELASTIC MODELS ............................................................................ 608 8.2.10 USE OF CALENDERING M ODELS ........................................ 608 8.3 POSTEXTRUSION CALENDERING PROCESS...............................................................610 8.3.1 PRESENTATION ........................................................................... 610 8.3.2 PROCESS MODELING .............................................................................. 611 8.3.2.1 PRESSURE FIELD CALCULATIONS .............................................. 611 5.3.2.2 TEMPERATURE FIELD CALCULATIONS .......... ............................. 612 8.4 APPENDIX.............................................................. 614 8.4.1 APPENDIX 1: CALCULATIONS OF TWO-DIMENSIONAL FLOW IN THE CALENDER BANK BY A FINITE ELEMENT METHOD ..................................... 614 8.4.1.1 THE STOKES EQUATIONS IN TERMS OF THE STREAM AND VORTICITY FUNCTIONS...........................................................614 8.4.1.2 SOLVING THE STREAM AND VORTICITY EQUATIONS FOR THE 2D CALENDERING PROBLEM (AGASSANT AND ESPY, 1985) .......... 615 REFERENCES............................................................................................................... 616 9 POLYMER STRETCHING PROCESSES..................................................................... 619 9.1 INTRODUCTION................................................................................................... 619 9.2 FIBER SPINNING................................................................................................619 9.2.1 DIFFERENT FIBER SPINNING SITUATIONS ................................................. 619 9.2.2 ISOTHERMAL MELT SPINNING OF A NEWTONIAN FLUID..............................621 9.2.2.1 KINEMATICS HYPOTHESES .................................................... 622 9.2.2.2 SET OF EQUATIONS...............................................................623 9.2.2.3 SOLUTION FOR ISOTHERMAL NEWTONIAN FIBER SPINNING ........ 623 9.2.2.4 APPLICATION EXAMPLES.......................................................624 9.2.2.5 VALIDITY OF THE APPROXIMATIONS U SED..............................625 9.2.2.5.1 NEGLECTING THE SHEAR COMPONENT....................................625 9.2.2.5.2 NEGLECTING THE GRAVITATIONAL (MASS) FORCE ...................... 625 9.2.2.5.3 NEGLECTING THE INERTIA F ORCE ........................................... 626 9.2.3 ISOTHERMAL MELT SPINNING OF A VISCOELASTIC FLUID ............................ 627 9.2.3.1 EQUATIONS..........................................................................627 9 2.3.2 DIMENSIONLESS EQUATIONS ................................................ 628 9.2.3.3 SOLUTION ............................................................................ 629 9.2.3.4 RESULTS.............................................................................. 630 9.2.4 DRAWING OF A VISCOUS FLUID IN NONISOTHERMAL CONDITIONS .............. 632 9.2.4.1 MECHANICAL EQUATIONS .................................................... 632 9.2.4.1.1 EQUATIONS OF MOTION........................................................632 9.2.4.1.2 FORCE BALANCE AT THE FILAMENT SURFACE ........................... 633 9.2.4.1.3 NEWTONIAN HYPOTHESIS .................................................... 634 9.2.4.2 HEAT TRANSFER EQUATION .................................................. 634 9.2.4.2.1 FORCED CONVECTION TERM...................................................635 9.2.4.2.2 RADIATIVE HEAT TRANSFER COEFFICIENT................................636 9.2A2.3 VISCOUS DISSIPATION RATE DURING DRAWING ..................... 636 9.2.4.3 SOLUTION FOR THE MOMENTUM AND HEAT TRANSFER EQUATIONS.......................................................................... 637 9.2.4.4 RESULTS..............................................................................637 9.2.5 MORE GENERAL MODELS OF FIBER SPINNING ........................................... 639 9.3 BIAXIAL DRAWING............................................................................................. 640 9.3.1 INTRODUCTION........................................................................................640 9.3.2 BIAXIAL STRETCHING OF A NEWTONIAN LIQUID ......................................... 640 9.4 CAST-FILM PROCESS......................................................................................... 642 9.4.1 PRESENTATION........................................................................................642 9.4.2 DIFFERENT KINEMATICS APPROACHES.....................................................643 9.4.2.1 TWO-DIMENSIONAL MEMBRANE APPROACH ......................... 643 9.4.2.2 ONE-DIMENSIONAL MEMBRANE APPROACH..........................644 9.4.2.3 ONE-DIMENSIONAL APPROACH ............................................. 645 9.4.3 ONE-DIMENSIONAL NEWTONIAN MODEL.................................................645 9.4.4 ONE-DIMENSIONAL MEMBRANE MODEL.................................................646 9.4.4.1 EQUATIONS OF THE NEWTONIAN MODEL.................................646 9.4.4.1.1 STRESS TENSOR.......................... 646 9.4.4.1.2 EQUATIONS ...... ............. ..................................................... 647 9.4.4.1.3 BOUNDARY CONDITIONS ...................... 647 9.4.4.2 RESULTS OF THE ONE-DIMENSIONAL NEWTONIAN MEMBRANE MODEL................................................................................648 9A4.3 EQUATIONS OF A VISCOELASTIC MODEL...................................649 9.4 A 4 RESULTS OF THE ONE-DIMENSIONAL VISCOELASTIC MEMBRANE MODEL................................................................................651 9.4.5 TWO-DIMENSIONAL MEMBRANE MODEL................................................. 652 9.4.5.1 EQUATIONS OF THE PROBLEM ................ 652 9A5.2 RESULTS OF THE TWO-DIMENSIONAL MEMBRANE MODEL ....... 653 9.4.5.3 NONISOTHERMAL MODEL ...................................................... 655 9.4.6 CONCLUSIONS........................................................................................ 657 9.4.7 PROBLEM S............................................................................................658 9.4.7.1 DRAWING OF A CONSTANT-WIDTH FILM .................................658 9.4.7.2 EXTRUSION OF TUBES...........................................................660 9.5 FILM-BLOWING PROCESS....................................................................................661 9.5.1 PROCESS DESCRIPTION .......................................................................... 661 9.5.2 FILM GEOMETRY.................................................................................... 664 9.5.3 EQUATIONS OF THE FILM-BLOWING P ROCESS ........................................... 665 9.5.3.1 KINEMATICS OF BUBBLE FORMATION ..................................... 665 9.5.3.2 STRESSES ACTING ON THE BUBBLE ......................................... 665 9.5.3.2.1 FORCE BALANCE IN THE DRAWING DIRECTION AND MERIDIAN S TRESS................................................................................ 665 9.5.3.2.2 FORCE BALANCE PERPENDICULAR TO THE FILM . ....................... 667 9.5.3.2.3 ORDER OF MAGNITUDE OF THE STRESS COMPONENTS .............. 668 9.5.3.3 HEAT BALANCE EQUATIONS ................................................... 669 9.5.4 NONISOTHERMAL NEWTONIAN MODEL ..................................................... 670 9.5.4.1 EQUATIONS..........................................................................670 9.5.4.2 EXAMPLES OF RESULTS......................................................... 671 9.5.5 NONISOTHERMAL VISCOELASTIC MODEL ................................................... 673 9.5.5.1 EQUATIONS..........................................................................673 9.5.5.2 EXAMPLES OF RESULTS.........................................................674 9.5.6 A SEMIEMPIRICAL MODEL OF THE BLOWN-FILM PROCESS .......................... 677 9.5.7 CONCLUSIONS........................................................................................ 678 9.6 MANUFACTURE OF HOLLOW PLASTIC BODIES........................................... ............... 679 9.6.1 VARIOUS BLOW-MOLDING PROCESSES ...................................................... 679 9.6.1.1 EXTRUSION BLOW MOLDING .................................................. 679 9.6.1.2 STRETCH BLOW-MOLDING PROCESS.........................................680 9.6.1.3 PROBLEMS ENCOUNTERED IN BLOW M OLDING ....................... 680 9.6.2 MODELING OF EXTRUSION BLOW MOLDING ............................................... 681 9.6.2.1 MEMBRANE OR THICK SHELL? .............................................. 681 9 6.2.2 CHOICE OF RHEOLOGICAL BEHAVIOR.......................................683 9 6.2.3 APPLICATION TO THE BLOWING OF A COMPLEX HOLLOW PART . .685 9.6.2.3.1 CURVILINEAR COORDINATES ................................................... 686 9.OE.2.3.2 DYNAMIC EQUILIBRIUM OF THE MEMBRANE ......................... 687 9 6.2.3.3 BOUNDARY CONDITIONS FOR THE PRESSURE ..... . ................... 688 9.OE.2.3.4 EXAMPLE............................................................................690 9.6.3 STRETCH BLOW-MOLDING PROCESS...........................................................692 9.6.3.1 INTRODUCTION......................................................................692 9.6.3.2 PROCESS MODELING.............................................................692 9.6.3.2.1 MODEL................................................................................693 9.OE.3.2.2 BOUNDARY CONDITIONS ...................................................... 694 9.OE.3.2.3 NUMERICAL SOLUTION .......................................................... 694 9.OE.3.3 EXAMPLE............................................................................695 9.6.4 CONCLUSIONS........................................................................................696 9.6.5 PROBLEM S............................................................................................697 9.6.5.1 INFLATION OF A NEWTONIAN SPHERICAL MEMBRANE . ............ 697 9.6.5.2 BLOWING OF A TUBULAR NEWTONIAN MEMBRANE OF CONSTANT LENGTH.............................................................................. 698 9.OE.5.3 BLOWING OF A THICK NEWTONIAN TUBE OF CONSTANT LENGTH 701 9.7 APPENDICES.....................................................................................................704 9.7.1 APPENDIX 1: SOLUTION OF THE ISOTHERMAL CAST-FILM EQUATIONS..........704 9.7.1.1 ONE-DIMENSIONAL MEMBRANE MODEL, NEWTONIAN CASE . .704 9.7.1.1.1 EQUATIONS ......................................................................... 704 9.7.1.1.2 DIMENSIONLESS VARIABLES ........ ....................................... 706 9.7.1.1.3 SOLUTION ........................................................................... 707 9.7.1.2 TWO-DIMENSIONAL MEMBRANE MODEL: VISCOELASTIC CASE .707 9.7.1.2.1 DIMENSIONLESS VARIABLES............................... 708 9.7.1.2.2 SOLUTION ........................................................................... 709 9.7.1.3 TWO-DIMENSIONAL MEMBRANE MODEL...............................709 9.7.2 APPENDIX 2: COOLING OF FILMS IN AIR OR W ATER ................................. 711 9.7.2.1 PROBLEM STATEMENT..........................................................711 9.7.2.2 SOLUTION......................................................................... .712 9.7.2.3 COOLING OF THE FILM IN AIR................................................. 712 9.7.2.3.1 HEAT TRANSFER COEFFICIENT BY CONVECTION . ....................... 712 9.7.2.3.2 HEAT TRANSFER COEFFICIENT BY RADIATION..........................713 9.7.2.5.3 COOLING CALCULATIONS.........................................................714 9.7.2.3.4 RESULTS . ........................................................... 714 9.7.2.4 COOLING OF THE FILM IN W ATER ........................................... 716 9.7.3 APPENDIX 3: SOLVING THE FILM BLOWING EQUATIONS . ........................... 718 9.7.3.1 NEWTONIAN CASE................................................................718 9.7.3.1.1 EQUATIONS AND UNKNOWNS........................... 718 9.7.3.1.2 DIMENSIONLESS VARIABLES ............................ 719 9.7.3.1.3 SOLUTION.............................. 721 9.7.3.2 VISCOELASTIC CASE ......................................... 722 9.7.3.2.1 EQUATIONS AND UNKNOWNS...............................................722 9.7.3.2.2 DIMENSIONLESS VARIABLES.................................................723 9.7.3.2.3 SOLUTION ........................................ 724 REFERENCES......................................................................................... ..................... 725 10 FLOW INSTABILITIES...........................................................................................731 10.1 EXTRUSION DEFECTS...................................................... ............. ..................... 731 10.1.1 DESCRIPTION OF THE VARIOUS DEFECTS OBSERVED IN CAPILLARY RHEOMETRY ................. 731 10.1.2 EXTRUSION DEFECTS OF LINEAR POLYMERS ............................................... 734 10.1.2.1 SHARKSKIN DEFECT...............................................................734 10.1.2.1.1 DESCRIPTION.......................................................................734 10.1.2.1.2 DEFECT QUANTIFICATION....................................................... 734 10.1.2.1.3 KEY PARAMETERS.................................................................737 10.1.2.1.4 INTERPRETATION...................................................................739 10.1.2.1.5 REMEDIES .......................................................................... 742 10.1.2.2 OSCILLATING DEFECT.............................................................745 10.1.2.2.1 PRESENTATION ........................................ 745 10.1.2.2.2 KEY PARAMETERS.................................................................747 10.1.2.2.3 BAGLEY CORRECTIONS...........................................................748 10.1.2.2.4 STRESS AT THE WALLS.............................................................749 10.1.2.2.5 DESCRIPTION OF THE OSCILLATING CYCLE................................750 10.1.2.2.6 INTERPRETATION AND MECHANISMS ..................................... 752 10.1.2.2.7 MOLECULAR INTERPRETATION ................................................. 755 10.1.2.2.8 EXAMPLE OF DESCRIPTIVE MODEL ......................................... 756 10.1.2.2.9 REMEDIES...........................................................................758 10.1.3 EXTRUSION DEFECTS OF BRANCHED POLYMERS ......................................... 759 10.1.3.1 DESCRIPTION.......................................................................759 10.1.3.2 WALL SHEAR S TRESS.............................................................761 10.1.3.3 INFLUENCE OF GEOMETRY..................................................... 762 10.1.3.4 INTERPRETATION...................................................................764 10.1.3.4.1 REMEDIES .......................................................................... 768 10.1.4 SUMMARY AND OUTLOOK.......................................................................769 10.2 COEXTRUSION DEFECTS ...... .............................. 770 10.2.1 INVESTIGATION OF COEXTRUSION INSTABILITIES ......................................... 770 10.2.1.1 INFLUENCE OF THE FLOW CONFIGURATION................................770 10.2.1.2 ANALYSIS OF THE FLOW WITHIN A COEXTRUSION D IE .............. 771 10.2.2 MODELING COEXTRUSION INSTABILITIES ................................................... 774 10.2.2.1 CONVECTIVE STABILITY INVESTIGATION....................................774 10.2.2.1.1 ASYMPTOTIC STABILITY ANALYSIS ......................................... 775 10.2.2.1.2 CONVECTIVE STABILITY ANALYSIS ........ ................................... 776 10.2.2.2 DIRECT NUMERICAL SIMULATION ........................................... 778 10.2.3 CONCLUSIONS.................................................................... 780 10.3 CALENDERING DEFECTS...................................................................................... 781 10.3.1 DIFFERENT TYPES OF DEFECTS.................................................................781 10.3.2 ANALYSIS OF THE MATTENESS D EFECT.....................................................783 10.3.3 ANALYSIS OF THE V-SHAPED DEFECT.......................................................784 10.3.4 ANALYSIS OF THE ROCKET DEFECT ...... . .................................................... 786 10.3.5 CONCLUSIONS...................................................................................... 788 10.4 DRAWING INSTABILITIES....................................................................................789 10.4.1 DESCRIPTION OF DRAWING INSTABILITIES ................................................. 789 10.4.1.1 EXAMPLE OF FIBER SPINNING ............................................... 789 10.4.1.2 EXAMPLE OF THE CAST-FILM PROCESS....................................791 10.4.1.3 EXAMPLE OF THE FILM-BLOWING PROCESS ............................. 792 10.4.1.4 CONCLUSIONS......................................................................794 10.4.2 MODELING FIBER SPINNING INSTABILITY ................................................. 795 10.4.2.1 STRETCHING OF A NEWTONIAN FLUID UNDER ISOTHERMAL CONDITIONS ........................................................................ 795 10.4.2.2 INFLUENCE OF THERMAL PHENOMENA...................................796 10.4.2.3 INFLUENCE OF VISCOELASTICITY ............................................. 798 10.4.3 MODELING CAST-FILM INSTABILITY.........................................................799 10.4.3.1 STABILITY OF A CONSTANT FILM WIDTH STRETCHING MODEL.. .799 10.4.3.2 STABILITY OF A ID MEMBRANE MODEL ACCOUNTING FOR NECK-IN.............................................................................. 800 10.4.3.3 STABILITY OF THE 2D MEMBRANE M ODEL..............................802 10.4.4 MODELING FILM-BLOWING INSTABILITIES ................................................. 803 10.4.5 CONCLUSION..........................................................................................806 REFERENCES............................................................................................................... 806 NOTATIONS.................................................................................................................... 817 COLOR SUPPLEMENT..................................................................................................... 827 SUBJECT INDEX, 837
any_adam_object	1
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spelling	Polymer processing principles and modeling Jean-François Agassant, Pierre Avenas, Pierre J. Carreau, Bruno Vergnes, Michel Vincent 2nd edition Munich ; Cincinnati Hanser [2017] © 2017 XLI, 841 Seiten Illustrationen, Diagramme txt rdacontent n rdamedia nc rdacarrier Verarbeitung (DE-588)4537851-4 gnd rswk-swf Kunststoffverarbeitung (DE-588)4114335-8 gnd rswk-swf Polymere (DE-588)4046699-1 gnd rswk-swf Kunststofftechnik (DE-588)4166076-6 gnd rswk-swf Kunststoffverarbeitung (DE-588)4114335-8 s DE-604 Polymere (DE-588)4046699-1 s Verarbeitung (DE-588)4537851-4 s 1\p DE-604 Kunststofftechnik (DE-588)4166076-6 s 2\p DE-604 Agassant, Jean-François (DE-588)112277837 ctb Avenas, Pierre ctb Carreau, Pierre J. ctb Erscheint auch als Online-Ausgabe 978-1-56990-606-4 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=029676960&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis 1\p cgwrk 20201028 DE-101 https://d-nb.info/provenance/plan#cgwrk 2\p cgwrk 20201028 DE-101 https://d-nb.info/provenance/plan#cgwrk
spellingShingle	Polymer processing principles and modeling Verarbeitung (DE-588)4537851-4 gnd Kunststoffverarbeitung (DE-588)4114335-8 gnd Polymere (DE-588)4046699-1 gnd Kunststofftechnik (DE-588)4166076-6 gnd
subject_GND	(DE-588)4537851-4 (DE-588)4114335-8 (DE-588)4046699-1 (DE-588)4166076-6
title	Polymer processing principles and modeling
title_auth	Polymer processing principles and modeling
title_exact_search	Polymer processing principles and modeling
title_full	Polymer processing principles and modeling Jean-François Agassant, Pierre Avenas, Pierre J. Carreau, Bruno Vergnes, Michel Vincent
title_fullStr	Polymer processing principles and modeling Jean-François Agassant, Pierre Avenas, Pierre J. Carreau, Bruno Vergnes, Michel Vincent
title_full_unstemmed	Polymer processing principles and modeling Jean-François Agassant, Pierre Avenas, Pierre J. Carreau, Bruno Vergnes, Michel Vincent
title_short	Polymer processing
title_sort	polymer processing principles and modeling
title_sub	principles and modeling
topic	Verarbeitung (DE-588)4537851-4 gnd Kunststoffverarbeitung (DE-588)4114335-8 gnd Polymere (DE-588)4046699-1 gnd Kunststofftechnik (DE-588)4166076-6 gnd
topic_facet	Verarbeitung Kunststoffverarbeitung Polymere Kunststofftechnik
url	http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=029676960&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
work_keys_str_mv	AT agassantjeanfrancois polymerprocessingprinciplesandmodeling AT avenaspierre polymerprocessingprinciplesandmodeling AT carreaupierrej polymerprocessingprinciplesandmodeling

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