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A cooling time model for plastics processing operations
Author(s) -
Dietz Wolfgang
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760181310
Subject(s) - materials science , extrusion , composite material , blow molding , thermal diffusivity , high density polyethylene , molding (decorative) , diagram , volume (thermodynamics) , polyethylene , polymer , thermal conductivity , pressure drop , computer simulation , thermodynamics , mechanics , mold , computer science , physics , database
The cooling of a crystallizing polymer is analyzed taking into account the effect of pressure drop on the energy balance. Thermal conductivity and diffusivity of a low density polyethylene are determined at pressures between 0.1 and 150 MPa (1 and 1500 bars). Using a pressure, volume, temperature‐diagram, a complete set of material functions could be obtained. A numerical cooling model based on these material functions was established and tested experimentally. Good agreement between the model and experiment was obtained. The numerical algorithm of the model can be adapted easily to plastics processing operations, e.g., injection molding, blow molding, and extrusion.