A model for the filling of cold cavities with solidifying, semi-crystalline polymers
- Imperial Coll. of Science and Technology, London (United Kingdom). Dept. of Chemical Engineering and Chemical Technology
- Los Alamos National Lab., NM (United States)
A model for the filling stage of injection molding that includes wall solidification and crystallisation was used to investigate the interaction between solidification and pressure drop during the filling of a rectangular plate with high-density polyethylene. We find that wall solidification affects the pressure drop in a complex way, reflecting the interplay between reduction in the area available for flow and thermal insulation of the still-molten polymer. Development of crystallinity on the surface of the part is also modelled under conditions of uniform and spatially varying cooling. Results indicate that nonuniform cooling can results in complex crystallinity distributions which are determined by thermal history of solidified polymer, duration of filling stage and by exact dependence of crystallisation kinetics on temperature.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6715130
- Report Number(s):
- LA-UR-92-3668; CONF-930584-1; ON: DE93003817
- Resource Relation:
- Conference: ANTEC 93/Society of Plastics Engineers meeting, New Orleans, LA (United States), 9-13 May 1993
- Country of Publication:
- United States
- Language:
- English
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A model for the filling of cold cavities with solidifying semi- crystalline polymers
A model for the filling of cold cavities with solidifying semi- crystalline polymers
Related Subjects
POLYETHYLENES
MOLDING
THERMOPLASTICS
COOLING
CRYSTALLIZATION
INJECTION
KINETICS
MATHEMATICAL MODELS
FABRICATION
INTAKE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
PLASTICS
POLYMERS
POLYOLEFINS
SYNTHETIC MATERIALS
360101* - Metals & Alloys- Preparation & Fabrication