Method for the manufacture of parts made of a synthetic...

B - Operations – Transporting – 29 – C

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Details

B29C 45/17 (2006.01) B60B 5/02 (2006.01)

Patent

CA 2543850

The invention relates to a method for the manufacture of parts which are made of a synthetic material and which have a hollow annular section, said parts being manufactured by prior injection of melted synthetic material into a mold, followed by injection of a pressurized fluid in order to force the melted material against the walls of the mold, finishing the filling of the mold. The invention also relates to the part thus obtained. The method is characterized in that it essentially consists in injecting melted synthetic material at the level of a nose or hub (3) by means of an opening in the mold, and in injecting a fluid close to the nose or hub (3) by means of at least one opening enabling a guiding zone (10) to be created for the axis of rotation. The invention can more particularly be applied to the production of hollow parts made of a synthetic material by injection.

La présente invention a pour objet un procédé de fabrication de pièces en matière synthétique à section annulaire creuse, réalisées par une injection préalable de matière synthétique fondue dans un moule, suivie par l'injection d'un fluide sous pression destiné à repousser la matière fondue contre les parois du moule, tout en terminant le remplissage de l'empreinte, ainsi que la pièce en matière synthétique obtenue. Procédé caractérisé en ce qu'il consiste essentiellement à réaliser l'injection de matière synthétique fondue, au niveau du nez ou moyeu (3), par l'intermédiaire d'un orifice prévu à cet effet dans le moule et en ce que l'injection d'un fluide est réalisée, à proximité du nez ou moyeu (3), à travers au moins un orifice prévu dans le noyau permettant la réalisation de la zone de guidage (10) de l'axe de rotation. L'invention est plus particulièrement applicable dans le domaine de la réalisation de pièces creuses en matière synthétique, par injection.

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