Air bag tear seam and method of manufacture

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/16 (2006.01) B29C 59/00 (2006.01) B60R 21/20 (2006.01) B29C 35/08 (2006.01) B29C 71/04 (2006.01)

Patent

CA 2235930

An air bag cover (14) for use in a supplement inflatable restraint system includes an air bag cover skin made of a polymeric material. The cover skin includes a weakened tear seam region (16) for guiding the tearing of the air bag cover skin in response to air bag inflation. The tear seam region is weakened by photodegradation, i.e., selective exposure to ultraviolet light (20) which breaks polymer bonds within the polymeric material of the tear seam region. Photodegradation reduces the tensile strength and/or the percent elongation (measured at break) of the tear seam region (16) compared to the rest of the air bag cover skin (24).

Recouvrement (14) de sac de sécurité gonflable destiné à servir de dispositif gonflable de protection complémentaire, comprenant un film de recouvrement constitué d'un matériau polymère. Ce film de recouvrement présente une zone plus faible correspondant à une couture arrachable (16), conçue pour guider l'arrachement de ce film lors du gonflage du sac gonflable de sécurité. Cette zone correspondant à la couture arrachable est affaiblie par photodégradation, c'est-à-dire par une exposition sélective à une lumière ultraviolette (20) qui rompt les liaisons polymères du matériau polymère dans la zone occupée par la couture. La photodégradation réduit la résistance à la traction et/ou le coefficient d'allongement (mesurée à la rupture) de la zone correspondant à cette couture arrachable (16), par rapport au reste du film (24) de recouvrement du sac de sécurité gonflable.

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