Apparatus for the sandwich method of injection molding

Details Apparatus for the sandwich method of injection molding Apparatus for the sandwich method of injection molding

1994-07-11

1995-08-22

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

26432817, 425557, 425558, 425560, 425574, B29C 4516

Patent

active

054433789

ABSTRACT:
A standard injection molding machine is combined with an auxiliary plasticizing unit having a hot runner manifold that can be alternately connected with or disconnected from the main injection unit of the molding machine to perform sandwich molding. The injection unit retracts from the mold to connect with a hot runner and receive skin material from a non-reciprocating screw extruder directly into the barrel of the injection unit. The injection unit then disconnects from the hot runner and moves back into position for injection into the mold. Simultaneously with this movement, the injection unit plasticizes sufficient core material to complete the stacked arrangement of skin and core material necessary for sandwich molding. In an alternate embodiment, the sandwich molding apparatus includes an accumulator with a suitable valve and connections to the other components to supply a final shot of skin material into the mold, as well as provide the pack and hold functions of the injection cycle.

REFERENCES:
patent: 3888612 (1975-06-01), Schrewe et al.
patent: 4090836 (1978-05-01), von der Ohe et al.
patent: 4715802 (1987-12-01), Arai
patent: 4722679 (1988-02-01), Farrell
patent: 4978493 (1990-12-01), Kersemakers et al.
patent: 5034177 (1991-07-01), Niimi et al.
patent: 5215762 (1993-06-01), Eder et al.
patent: 5286184 (1994-02-01), Nakayama
patent: 5366366 (1994-11-01), Yokohama
Jaroschek, "New Ways With the Sandwich Method of Injection Molding", Kunststoffe/German Plastics, vol. 83, Jul. 1993.

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