Patent ID: 7425293
Filing Date: 2008-09-16
Classification: B29C,B29L,B30B

Abstract:
1. A method for forming an article of synthetic thermoplastic material by compression moulding, comprising at least the following operative stages: (a) inserting a first pellet of synthetic thermoplastic material in a plastic state into the first cavity of a mould having at least two cavities and comprising a punch suitable to be alternatively aligned with said cavities; (b) aligning said punch with the said first cavity with which it defines a first forming chamber for said first pellet; (c) pressing said pellet and cooling to obtain a first portion of the article, remaining rigid with the punch; (d) opening the mould and aligning said punch with a second cavity of the mould; (e) inserting a second pellet of synthetic material into said second cavity, the synthetic material of the second pellet being miscible with the synthetic thermoplastic material of the first pellet; (f) closing the mould by repositioning the punch relative to said second cavity to define a second forming chamber between the punch, having said first portion of the article rigid therewith, and said second mould cavity; (g) pressing said second pellet to form a second portion of the article; and (h) again opening the mould, and extracting said article from the punch.