| 摘要 |
<p>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).</p> |
