Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1995-04-27
1996-07-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264318, 425130, B29C 4512, B29C 4516
Patent
active
055386784
ABSTRACT:
In order to produce a cassette, such as tape cassette, disc cassette or the like, the following steps are taken. First, fixed and movable dies are prepared which are unitable to define therewithin a shaped cavity. The movable die has at its inner surface a retaining ridge which includes a first portion immediately projected from the inner surface and a second portion immediately projected from the first portion. The second portion has side walls at least one of which has a laterally extending projection at the position remote from the first portion. Second, the fixed and movable dies are coupled to define the shaped cavity therewithin. Third, a plastic material is injected into the shaped cavity in such a manner that the retaining ridge is immersed in the injected plastic material. Fourth, the fixed and movable dies are uncoupled and a cured molded article of the plastic material thus produced is released from the movable die. Due to the unique configuration of the retaining ridge, undesirable burrs which are inevitably produced on the molded article are entirely positioned in a groove which is formed in the article by the retaining ridge.
REFERENCES:
patent: 2874412 (1959-02-01), Flemming et al.
patent: 3646190 (1972-02-01), Spyra
patent: 4399092 (1983-08-01), Snow, Sr. et al.
patent: 4402660 (1983-09-01), Prusak
patent: 4447381 (1984-05-01), Matey
patent: 4979891 (1990-12-01), Kitamura
Patent Abstracts of Japan, vol. 15, No. 480, Dec. 5, 1991 corres. to Japanese Publication No. JP3207068.
Maioli Jay H.
Ortiz Angela
Silbaugh Jan H.
Sony Corporation
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