Manufacturing method for magnetic tape cassette

Details Manufacturing method for magnetic tape cassette Manufacturing method for magnetic tape cassette

1988-01-28

1989-06-20

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

264 17, 264246, 264255, 2643287, 2643288, 26432812, B29C 4504, B29C 4516

Patent

active

048407607

ABSTRACT:
A method of manufacturing a magnetic tape cassette by using a molding die having a fixed part and a second part including a submarine gate and a plurality of movable cores. The method includes the steps of defining an initial opening in the molding die between the fixed part and the movable cores, filling a molten plastic for molding the body of the cassette into the initial opening in the molding die, selectively moving the plurality of cores to change the size of the initial opening to define a new opening connected to the submarine gate, and filling the new opening through the submarine gate with a molten plastic different from the plastic already filled into the initially formed opening in order to mold the body in a plurality of colors.

REFERENCES:
patent: 3822107 (1974-07-01), Wogerer
patent: 4726758 (1988-02-01), Sekine et al.

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