Filter e.g. for use in vehicle occupant restraint system, has two cylindrical layers of embossed sheet material positioned adjacent with each other such that raised portions on one layer protrude towards other layer and vice-versa

摘要

A filter (58) has two cylindrical layers of embossed sheet material (200,201), each including base from which raised portions extend and define several openings. With the layers of sheet material positioned adjacent to each other, the raised portions of one layer protrude towards the other layer, while the raised portions of the other layer protrude towards one layer. A layer of filter material is interposed between the cylindrical layers.