The device has a cutting device (3) for introducing cuts in a material web (1) and a bearing surface (2) for planar support of the material web. A measuring device is provided for determining a residual wall thickness of the remaining material thickness, d...

In order to provide a technique effective in reasonably constructing an airbag cover for covering a vehicle airbag, an ultrasonic machine 200 is used that includes an ultrasonic machining blade 216 for machining a tear line 102 in the cover rear surface 10...

Residual wall thickness (A2) of a material (70) is controlled on-line, during airbag weakening, when lines of weakness, or desired rupture- and penetration lines are formed. Residual wall thickness (A2) of the material (70) is controlled on-line, during ai...