Method of injection-moulding by injection of an article...

Details Method of injection-moulding by injection of an article... Method of injection-moulding by injection of an article...

B - Operations, Transporting

29

C

18/702

B29C 45/16 (2006.01)

Patent

CA 1049721

ABSTRACT OF THE DISCLOSURE The invention relates to a method and apparatus for the manufacture by injection moulding of articles composed of a plurality of layers of at least three distinct materials coated one over the other, in which there is injected 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 mould coaxially so as to give a uniform distribution. The injection moulding apparatus includes an in- jection nozzle having a single discharge channel opening on the side of the mould and at least three coaxial chambers each connected to a separate supply circuit for each material to be injected. The invention is especially app- licable to the production of articles in which the external and internal materials are joined together by an intermediate material.

209706

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