Apparatus for injection-molding three-layer moldings

Details Apparatus for injection-molding three-layer moldings Apparatus for injection-molding three-layer moldings

1996-12-04

1999-04-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

2643288, 425572, 425588, B29C 4522

Patent

active

058940235

ABSTRACT:
Apparatus of injection molding three-layer moldings, especially bottle blanks with an inner and an outer layer of polyethylene terephthalate and a middle layer of recycled polyethylene terephthalate, employing a mold with several cavities. The material (component A) for the inner and outer layers is supplied through one molten-component conveying channel and the material (component B) for the middle layer through another molten-component conveying channel. The channels are separately heated and their temperatures independently regulated. The melt for component A flows the same distance as the melt for component B. The melts flow into the injection-molding dies such as to ensure a uniform front.

REFERENCES:
patent: 3981672 (1976-09-01), Wilson
patent: 4492556 (1985-01-01), Crandell
patent: 4516927 (1985-05-01), Yoshida
patent: 4863665 (1989-09-01), Schad et al.
patent: 4869862 (1989-09-01), Bryan
patent: 5102602 (1992-04-01), Ziegler
patent: 5254305 (1993-10-01), Fernandez et al.
patent: 5389331 (1995-02-01), Uehara et al.
patent: 5443767 (1995-08-01), Cahill

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