B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/06 (2006.01) B29C 45/16 (2006.01) B29C 49/08 (2006.01) B29C 49/22 (2006.01) B65D 35/08 (2006.01) B29C 45/00 (2006.01)
Patent
CA 2253168
A process is disclosed for manufacturing a tube preform by injection moulding. The inventor has discovered that it is possible to manufacture a tube with a sufficiently solid shoulder for a technical thread and with the desired degree of softness of the outer surface by injection moulding tube preforms which may be designed with one or several layers, then by stretching the preforms, in particular by heating and stretching them along two axes by means of compressed air.
L'invention concerne un procédé de fabrication d'une préforme tubulaire par moulage par injection. L'inventeur a découvert que l'on peut obtenir un tube dont l'épaulement a une solidité suffisante pour porter un filet technique et dont la surface extérieure a la souplesse voulue pour un tube, en fabriquant des préformes tubulaires à une ou plusieurs couches par moulage par injection, puis en les étirant, notamment en les chauffant et en les étirant le long de deux axes à l'aide d'air comprimé.
Kuhn Hans
Smart & Biggar
LandOfFree
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