Patent ID: 7431328
Filing Date: 2008-10-07
Classification: B23K,B60R

Abstract:
1. A method for generating a predetermined break line in a multilayer airbag covering with a carrier layer, a supporting layer and a decorative layer, in which the material of the carrier layer has a greater density than that of the supporting layer comprising the steps of: generating blind holes or microperforations which are spaced apart along a desired predetermined break line in the decorative layer by a laser which impinges upon the airbag covering with a beam diameter (a) and which has a Gaussian beam density distribution; providing that the material of the carrier layer is completely ablated along the predetermined break line, over a width (b), width (b) being defined as a dimension transverse to the break line, at least in the spaces of the blind holes or microperforations, where (b) is greater than (a); generating the spaced blind holes or microperforations through the openings created in the carrier layer by the laser; and allowing the combustion gases that occur to escape through the openings.