Supports: racks – Special article – Platelike
Patent
1998-09-08
2000-02-01
Brown, Peter R.
Supports: racks
Special article
Platelike
264572, B29C 4503, B65D 8530
Patent
active
060192313
ABSTRACT:
An improvement is proposed for an injection molding method for the preparation of a wafer cassette for holding single crystal silicon wafers in alignment. While such a wafer cassette has several thick-walled portions such as reinforcement ribs, each of which is provided with a positioning groove for accurate positioning of an automatic machine for loading and unloading of wafers, such thick-walled portions in the prior art cassettes are subject to thermal shrinkage or molding sink in molding so as to cause deformation of the positioning grooves disturbing reliable positioning of the automatic machine. The improvement of the invention can be accomplished by undertaking the gas-assist method in which a gas is introduced into the cavity of the metal mold so as to form hollow cavities behind the positioning grooves to thus avoid the thermal shrinkage or molding sink due to the large wall thickness.
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Brown Peter R.
Shin-Etsu Handotai & Co., Ltd.
Shin-Etsu Polymer Co. Ltd.
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