Apparatus for two-layered injection moulding

US5071335A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Gerd Riedel · Munich, DE
• Gottfried Lutz · Hanerau-Hademarschen, DE
• Rudolf Breuer · Munich, DE
• Franz Gumplinger · Rottenburg am Neckar, DE

Key dates

• Filing date: Sep 12, 1990
• Grant date: Dec 10, 1991
• Expiry date: Sep 12, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S425/005
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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).