Method for manufacturing magnetic tape cassette

Details Method for manufacturing magnetic tape cassette Method for manufacturing magnetic tape cassette

1992-02-12

1998-08-04

Ortiz, Angela

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

264255, 2643287, 2643288, B29C 4516, B29C 4513

Patent

active

057889066

ABSTRACT:
A magnetic tape cassette and a method for manufacturing a magnetic tape cassette including a combination of upper and lower half cases each including a window part and a main body half, the main body half including a trapezoidal portion on a top side of the main body half extending along a length thereof and defining a portion of the cassette having an increased thickness. The cassette is produced in accordance with a process including the steps of providing a mold having a first injection space defining the main body half and a second injection space defining the window part, providing a first gate, communicating with the first injection space, in the metal mold at a position of the trapezoidal portion of the main body half, injecting a first resin into the first injection space through the first valve gate, providing a second valve gate, communicating with the second injection space, in the metal mold, and injecting a second resin into the second injection space through the second valve gate. The first gate is positioned centrally along the length of the trapezoidal space and the first and second resins have different colors.

REFERENCES:
patent: 4726758 (1988-02-01), Sekine
patent: 5084223 (1992-01-01), Morita et al.
patent: 5125816 (1992-06-01), Morita

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