Apparatus for two-layered injection moulding

Details Apparatus for two-layered injection moulding Apparatus for two-layered injection moulding

1990-09-12

1991-12-10

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

2643287, 2643288, 425577, 425DIG5, B29C 4516

Patent

active

050713353

ABSTRACT:
In an injection moulding tool for the production of a magnetic tape cassette casing constructed, in part, in two layers the apparatus has a fixed core (1a) provided, on the rim, with a projection (5) which provides a sealing strip relative to the moving core (2a). After the injection moulding process into the first mould cavity (4), the moving core (2a) is moved axially downwards by about half the wall thickness, whereupon the second mould cavity (3, 3') is filled by injection through a second needle shut-off nozzle (FIG. 1b).

REFERENCES:
patent: 4650601 (1987-03-01), Brunner et al.
patent: 4726758 (1988-02-01), Sekine et al.
patent: 4801068 (1989-01-01), Graczoll et al.
patent: 4803031 (1989-02-01), Ochs et al.
patent: 4832254 (1989-05-01), Peuke et al.
patent: 4840760 (1989-06-01), Oishi
patent: 4867672 (1989-09-01), Sorensen

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