Movable molten mass guide sleeve to compensate for...

Details Movable molten mass guide sleeve to compensate for... Movable molten mass guide sleeve to compensate for...

1999-09-20

2002-05-21

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

C425S569000

Reexamination Certificate

active

06390803

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to hot runner systems for use in injection molding systems in connection with the treatment of thermoplastic materials.
BACKGROUND
Prior art systems have used rigidly mounted molten mass guide sleeves. The expansion of such guide sleeves must be calculated very precisely. This application requires extremely stringent mounting tolerances and often lead to mold cavity ruptures or leakage as a result of temperature differences. Moreover, higher temperatures may lead to ruptures since there is not enough room for the expansion. In addition, lower temperatures may lead to leakage since it results in excessive play between the sealing lip and the feed orifice of the mold cavity.


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Thornton et al., “Fundamentals of Engineering Materials”, 1985, Prentice-Hall., Inc., pp. 435, 442, 999.*
Rosato et al.: Injection Molding Handbook (2nd Ed.) 1995 Chapman & Hall (pp. 262-266 and 291).

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