Contribution of flow deformation to the shrinkage of injection molded PVC

The viscoelastic nature of PVC cannot be ignored during the injection molding process. Strains imposed on the compound during the injection stage display recovery dynamics that are indicative of the temperature at which the strains were imposed. A mathematical model, employing “approximate” time‐tem...

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Bibliographic Details
Published in:Journal of vinyl & additive technology 1999-09, Vol.5 (3), p.116-124
Main Authors: Ray Jr, E. Harrell, Elleithy, Rabeh H., McFarland, Coleen A., Summers, James W.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Injection moulding
Machinery and processing
Moulding
Plastics
Polymer industry, paints, wood
Technology of polymers
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Summary:The viscoelastic nature of PVC cannot be ignored during the injection molding process. Strains imposed on the compound during the injection stage display recovery dynamics that are indicative of the temperature at which the strains were imposed. A mathematical model, employing “approximate” time‐temperature modulus relationships, provided the basis for interpreting the shrinkage data. A distribution map of the various relative temperatures attained within the part during injection was determined.
ISSN:1083-5601
1548-0585
DOI:10.1002/vnl.10320