Method of injection-moulding by injection of an article composed

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

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264245, 264328, B29F 103

Patent

active

040524973

ABSTRACT:
The invention relates to a method for the manufacture by injection molding of articles composed of a plurality of layers of at least three distinct materials coated one over the other, the method comprising the steps of successive injection of a measured quantity of a first material adapted to form the skin of the article, a measured quantity of a second material to form the intermediate layer, and a measured quantity of a third material to form the body of the article, the materials being introduced into the mold coaxially so as to give a uniform distribution. The invention is especially applicable to the production of articles in which the external and internal materials are joined together by an intermediate material.

REFERENCES:
patent: 2418856 (1947-04-01), Stacy
patent: 3221373 (1965-12-01), Kwan
patent: 3513060 (1970-05-01), Krystof
patent: 3716612 (1973-02-01), Schrenk
patent: 3764642 (1973-10-01), Boutillier
patent: 3793415 (1974-02-01), Smith
patent: 3873656 (1975-03-01), Garner
patent: 3894823 (1975-07-01), Hanning
patent: 3906066 (1975-09-01), Barrie
patent: 3947177 (1976-03-01), Eckart

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