Sequentially injected multi-component core-back injection moldin

Details Sequentially injected multi-component core-back injection moldin Sequentially injected multi-component core-back injection moldin

1990-06-18

1991-09-17

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

2642972, 2643287, 2643288, 425120, 4251291, 425130, 425572, 425577, 425588, B29C 4512, B29C 4516

Patent

active

050493434

ABSTRACT:
A highly efficient and highly controllable method and an apparatus for core-back injection molding of multi-component plastic products. Core-back injection molding makes possible the injection of a first plastic material into a mold cavity, followed by retracting a barrier means, in order to enable injection of a second plastic material without separating any mold halves. The present invention enables very efficient injection molding because both injection units may be operated at the time, and the present invention enables very controlled injection because it is possible to inject only one half of the cavities by a specific injection unit at the same time, or even only one quarter of the cavities by a specific injection unit at the same time. The injection molding apparatus includes a first injection unit, a second injection unit, a right adjustable mold cavity with a first moveable barring means, a left adjustable mold cavity with a second moveable barring means, and a common standard clamping unit.

REFERENCES:
patent: 4416602 (1983-11-01), Neumeister
patent: 4726758 (1988-02-01), Sekine et al.
patent: 4803031 (1989-02-01), Ochs et al.

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