✦ LIBER ✦

Effects of cooling time and mold temperature on quality of moldings with precision contour

✍ Scribed by S. Y. Yang; L. Lien

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 595 KB
Volume: 15
Category: Article
ISSN: 0730-6679
DOI: 10.1002/(sici)1098-2329(199624)15:4<289::aid-adv2>3.0.co;2-p

No coin nor oath required. For personal study only.

✦ Synopsis

Injection molding is now used to mold plastic parts with precision contours such as lenses. Cooling conditions have critical effects on the quality and productivity of such precision parts. This article is devoted to investigate the effects of mold temperature and cooling time on quality. A two-cavity mold for molding convex lenses with square-looped cooling channels was used. Samples molded with different mold temperatures and cooling times were collected, and their contour conformity to those of the cavity was evaluated. Contour errors were defined. The correlation between mold temperature and cooling time and contour errors was analyzed. It has been found that for a given mold temperature, two critical cooling times can be defined at which the thermal and rigidity states pass through a transition. Most dramatic improvements in part conformity occur around such critical points. 0 1996

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