Process for manufacturing an automotive trim piece having a...

B - Operations – Transporting – 29 – C

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B29C 69/00 (2006.01) B29C 63/44 (2006.01) B29C 65/66 (2006.01) B60R 13/04 (2006.01)

Patent

CA 2167086

A process for manufacture of an automotive trim piece having a polymeric skin (18) fastened to a substrate. The polymer, for example, polyvinyl chloride, has the property that upon cooling to a relatively rigid state the polymer shrinks. The process includes molding the polymeric skin separately from the substrate such that the skin has a rear face for abutment with an obverse face of the substrate and a pair of lips (27) extending from ends of the rear face. The lips are configured for engaging corresponding edges (29) of the substrate. The skin is cooled to a relatively elastic state, and the skin and substrate are assembled while the skin is in the relatively elastic state. On further cooling, shrinkage forces of the skin (18) and the skin lips (27) in abutment with the corresponding edges (29) of the substrate produce a snug fit from edge to edge of the skin to the substrate and the skin becomes relatively rigid.

Procédé de fabrication d'un élément de garniture d'automobile présentant une pellicule polymère fixée à un substrat. Le polymère, du polyvinylchlorure, notamment, se caractérise en ce qu'il présente un retrait en refroidissant et en acquérant un état relativement rigide. Le procédé consiste à mouler la pellicule polymère séparément du substrat de façon que ladite pellicule présente une face postérieure devant venir en butée avec une face opposée correspondante du substrat, ainsi qu'une paire de rebords s'étendant à partir des extrémités de cette face postérieure. Les rebords sont configurés de façon à venir en appui contre les rebords correspondants du substrat. La pellicule est refroidie jusqu'à acquérir un état relativement élastique et la pellicule et le substrat sont assemblés tandis que la pellicule présente un état relativement élastique. En refroidissant davantage, la pellicule présente un retrait qui sollicite cette dernière, ainsi que les rebords, en butée contre les bords correspondants du substrat pour produire un ajustement serré, de bord en bord, entre la pellicule et le substrat, ladite pellicule devenant alors relativement rigide.

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