Trw Occupant Restraint Systems Gmbh

Bernd Nusshor

Anton Fischer

Oliver Blumenschein

The invention relates to a gas bag cover for a vehicle occupant restraining system wherein said cover has a tear line extending from the inner side thereof as far as a predetermined residual wall thickness and to a method for the production thereof. The cover is characterized in that as a main component thereof it comprises one or more layers in a composite structure of a material selected from the group consisting of elastomer alloys of a thermoplastic polymer with a non-cross linked, partly cross-linked or completely cross-linked EPDM terpolymer, of block copolymers of alternating polyester and polyether blocks and of block copolymers of polystyrene and polyolefines, in that the residual wall thickness amounts to between 0.3 and 1 mm along the major part of the course of the tear line, and in that the tear line, starting from an inner side of the cover, steadily tapers toward an outer side thereof. The tear line is produced with the aid of a laser from the inner side of the cover.

Method for the manufacture of a gas bag cover using laser scoring

The invention relates to a cover for a gas bag of an occupant restraining system in vehicles which is provided with an emblem, obtainable by direct printing of a predetermined surface of the cover made of plastic with one or more printing inks and/or by stamping an embossing foil on the predetermined surface of the cover.

Method of preparing a gas bag cover with an emblem

Gas bag cover for a vehicle occupant restraining system and method for

The cover for a gas bag module comprises as its main part two layers of a fully vulcanized polyolefinic material, which are formed into a composite structure. This material consists of fully cross-linked rubber particles, which are distributed in a continuous matrix of thermoplastic material. The first layer is relatively hard with a hardness of approximately 32 to 43 Shore D and is essentially responsible for providing the desired structural strength. The second layer is relatively soft with a hardness of approximately 45 to 80 Shore A and ensures a pleasant, soft feeling when touched. It bears a coating of a two-component urethane lacquer system having a high scratch and abrasion resistance.

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Spraitbach, Germany

Bernd Nusshor