Process for the injection moulding of multi-layered articles

Details Process for the injection moulding of multi-layered articles Process for the injection moulding of multi-layered articles

B - Operations, Transporting

29

C

18/687

B29C 45/14 (2006.01)

Patent

CA 1318098

ABSTRACT OF THE DISCLOSURE An injection moulding process for the manufacture of multi-layered articles, especially articles having barrier properties, is disclosed. The process comprises clamping a thermoplastic film over the cavity of a mould of an injection moulding process, the film being capable of being stretched. The film is then stretched within the mould by inserting the core of the mould, preferably using a core in which a central part enters the mould and partially stretches the film prior to the remainder of the core entering the mould. The mould is then closed, excess film is trimmed off and polymer is injected into the mould cavity. The resultant article is a multi-layered injection moulded article which, depending on the characteristics of the film and injected polymer, may have barrier properties to oxygen, liquids or the like that are superior to articles moulded from only the polymer. The process is particularly useful in the moulding of containers having a depth;width ratio of at least 0.5. DC-0216

588122

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