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Proceedings Paper

Application of thermographic temperature measurements in injection molding and blow molding of plastics
Author(s): Mark Prystay; Hao Wang; Andres Garcia-Rejon
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Paper Abstract

Infrared thermal analysis is used to characterize and optimize injection moulding and blow moulding of plastic parts colored with 2 - 4% carbon black. Thermographic and ultrasonic data show that during injection moulding shrinkage of the plastic in the mould creates a gap between the part and mould which produces a thermal contact resistance thereby reducing the cooling efficiency of the mould. The effect of shrinkage was minimized by using high packing pressures. Thermal analysis of blow moulding provides evidence of a 'skin' on the surface of the parison which affects the wetting of the part and mould. A high blow rate is required to maintain a parison that wets the mould surface well to promote the transfer of heat out of the part. In addition, under fixed operating conditions. The temperature field on thin walled parts can be used to obtain on-line thickness distributions and measure blow ratios. Results of the study have been applied to the analysis of automotive parts.

Paper Details

Date Published: 15 March 1996
PDF: 10 pages
Proc. SPIE 2766, Thermosense XVIII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (15 March 1996); doi: 10.1117/12.235399
Show Author Affiliations
Mark Prystay, National Research Council Canada (Canada)
Hao Wang, National Research Council Canada (Canada)
Andres Garcia-Rejon, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 2766:
Thermosense XVIII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications
Douglas D. Burleigh; Jane W. Maclachlan Spicer, Editor(s)

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