Multi-cavity, co-injection molding apparatus

Details Multi-cavity, co-injection molding apparatus Multi-cavity, co-injection molding apparatus

1990-05-14

1991-07-02

Heitbrink, Jill L.

Plastic article or earthenware shaping or treating: apparatus

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

425547, 425559, 425564, 425572, B29C 4516

Patent

active

050282263

ABSTRACT:
An injection moulding apparatus (10) includes similar co-injection modules (12) each provided with common supplies (238-242) and supplied with different polymer materials at intermediate pressure by common plasticisers (14-18). Each module has a co-injection nozzle assembly (70) in wich each nozzle (148-154) is supplied with polymer at injection pressure by an injector (208) which receives polymer through a non-return valve (220). The injector is mounted alongside the nozzle on a polymer transfer plate (138-146), and has the position of its piston (212) controlled by a hydraulic actuator (214) under the control of a dedicated micro-processor (164) in accordance with a stored injection control program. Each polymer is injected by an injector (208) directly into the associated nozzle (148-154) and is controlled solely by injector operation, and without the use of any control valve between the injector and the nozzle. The module micro-processors are controlled by a host processor which organizes the operations of the apparatus.

REFERENCES:
patent: 3909169 (1975-09-01), Barrie
patent: 4124308 (1978-11-01), Sokolow
patent: 4717324 (1988-01-01), Schad et al.
patent: 4781954 (1988-11-01), Krishnakumar et al.

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