Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1992-04-22
1994-03-15
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
2643288, 26432812, B29C 6722, B29C 4516
Patent
active
052943852
ABSTRACT:
An injection mold for forming a thick-walled front cabinet which has a front frame panel and a cabinet portion integral with each other and which is used for an image display device containing a cathode ray tube therein. The mold has a cavity having a large depth corresponding to the large wall thickness of said cabinet, the depth of said cavity being reduced at at least a portion for forming an edge of said front frame panel contactable with said cathode ray tube, a sprue, a single runner communicating with said sprue, and a single film-type tunnel gate communicating with said runner and communicating with a portion of said cavity for forming an upper portion of said cabinet. First molten synthetic resin is first injected by a first cylinder of a sandwich injection molding machine through said tunnel gate into a portion of said cavity including said reduced depth portion. Then, second molten synthetic resin containing a blowing agent is injected by a second cylinder of the sandwich injection molding machine into said cavity through said tunnel gate. Said film-type tunnel gate may communicate with a front frame panel forming portion or a cabinet portion forming portion of the cavity.
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Kuhns Allan R.
Kyowa Electric & Chemical Co., Ltd.
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