Modelling of the Cooling of Semi-crystalline Polymers during their Processing
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N. Billon
Abstract
As a first step for the modelling of the processing of semi-crystalline polymers, it is proposed a new overall kinetic model which allows to calculate the evolution of the transformed volume fraction whatever the cooling conditions are. This model derives from initial Avrami-Evans' theory. The transformed volume fraction is calculated as a function of parameters which are measured during crystallizations at a constant cooling rate. This model is easy to use and can be introduced into a more complete thermomechanical calculation. For this purpose we propose to express the energy equation in terms of the enthalpy function. Two applications of our model are presented: the cooling of a polymer sheet (non-flowing polymer) and the cooling of the film on the chill-roll during the cast film extrusion process (flowing polymer).
© 1991, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Review Paper
- Existing Scale-up Rules for Single-screw Plasticating Extruders
- Internal Mixers
- Scale-up Effect in Internal Mixers
- Mixing and Extrusion of High Silica and all Silica-natural Rubber Compounds
- Screw Extrusion
- An Analytical Model of Partial and Thorough Melting in Single-screw Extruders
- Dimensionless Non-Newtonian Isothermal Simulation and Scale-up Considerations for Modular Intermeshing Corotating Twin Screw Extruders
- Erratum
- Die Extrusion
- Extrusion of Rubber Compounds and Highly Filled Thermoplastics through Coathanger Dies
- Pressure Oscillations during Capillary Extrusion of High Density Polyethylene
- Frequency Analysis of Pressure Fluctuations in a Single Screw Extruder
- Fibers and Films
- Orientation and Mechanical Property Development in the Melt Spinning of Fibers from Polyetherimide and Polyarylate
- Study on the Formation of β-Crystalline from Isotactic Polypropylene Fiber
- Biaxially-oriented Polyethylene Films by Compression of Injected Moldings
- Modelling of the Cooling of Semi-crystalline Polymers during their Processing
- Molding
- Non-isothermal Mold Filling and Curing Simulation in Thin Cavities with Preplaced Fiber Mats
- Predicting the Skin-Core Boundary Location in Injection Moldings
Artikel in diesem Heft
- Contents
- Contents
- Review Paper
- Existing Scale-up Rules for Single-screw Plasticating Extruders
- Internal Mixers
- Scale-up Effect in Internal Mixers
- Mixing and Extrusion of High Silica and all Silica-natural Rubber Compounds
- Screw Extrusion
- An Analytical Model of Partial and Thorough Melting in Single-screw Extruders
- Dimensionless Non-Newtonian Isothermal Simulation and Scale-up Considerations for Modular Intermeshing Corotating Twin Screw Extruders
- Erratum
- Die Extrusion
- Extrusion of Rubber Compounds and Highly Filled Thermoplastics through Coathanger Dies
- Pressure Oscillations during Capillary Extrusion of High Density Polyethylene
- Frequency Analysis of Pressure Fluctuations in a Single Screw Extruder
- Fibers and Films
- Orientation and Mechanical Property Development in the Melt Spinning of Fibers from Polyetherimide and Polyarylate
- Study on the Formation of β-Crystalline from Isotactic Polypropylene Fiber
- Biaxially-oriented Polyethylene Films by Compression of Injected Moldings
- Modelling of the Cooling of Semi-crystalline Polymers during their Processing
- Molding
- Non-isothermal Mold Filling and Curing Simulation in Thin Cavities with Preplaced Fiber Mats
- Predicting the Skin-Core Boundary Location in Injection Moldings
