Injection molding apparatus for forming a composite, foam-skin,

Details Injection molding apparatus for forming a composite, foam-skin, Injection molding apparatus for forming a composite, foam-skin,

1974-05-16

1976-06-29

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425245R, 425817R, B29D 2700, B29E 300

Patent

active

039663728

ABSTRACT:
A first thermoplastic resin for forming the shell of an article is charged into the front portion of an injection cylinder and a second thermoplastic resin for forming the core of the article is charged into the rear portion of the injection cylinder. Both resins are substantially separated, being in contact only a central area of the cross-sectional plane of the injection cylinder. These thermoplastic resins are injected in a mass into a mold cavity with the second resin enveloped by the first resin, and finally solidified in the mold cavity resulting in a molded article having sandwich construction. Various sandwich articles can be obtained easily by means of a single injection molding machine. The process also allows repeated injection operations without exposure of the core material on the surface of the molded article.

REFERENCES:
patent: 2418856 (1947-04-01), Stacy
patent: 2804649 (1957-09-01), Hupfield
patent: 3097396 (1963-07-01), Ludwig
patent: 3339240 (1967-09-01), Corbett
patent: 3398436 (1968-08-01), Nouel
patent: 3436793 (1969-04-01), Trueblood
patent: 3894823 (1975-07-01), Hanning

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