Agfa-gevaert Ag

Franz Gumplinger

Gerd Riedel

Gottfried Lutz

Rudolf Breuer

Helmut Peuke

Peter Graczoll

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).

Apparatus for two-layered injection moulding

An injection moulding tool with optimum temperature distribution as the result of an improved tempering duct system is obtained if the tool inserts (10, 11) are each made up of two or more plates, tempering ducts (12, 12', 12') are worked in from the external faces (F1, F2, F3), on which the parts are subsequently joined by the diffusion welding method. An injection moulding tool for VHS reel hubs produced by this method produces moulds for injection moulding with substantially reduced wobble and a reduced cycle time.

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Rottenburg, Germany

Franz Gumplinger