Fibrous mat fixing structure

Abstract

A fibrous mat fixing structure in which a fibrous mat such as a non-woven fabric mat 30 is integrally attached to a resin molding 20 by ultrasonic welding is designed to reduce the working time and simplify working facilities while preventing any considerable surface defect such as irregularities in the surface of the resin molding 20. A luggage room side trim (sound absorbing member for a vehicle) 10 has a fibrous mat such as a non-woven fabric mat 30 welded and integrally attached to a luggage room side trim main molding by an ultrasonic horn 50. A sharp projecting thread 52 is formed on a flat pressing surface 51 of the ultrasonic horn 50. A V-groove 42 which bites into the resin molding 20 is formed in a weld portion 40 of the non-woven fabric mat 30 together with a flat weld surface 41, thereby enabling fibers in the non-woven fabric mat 30 to easily bite into the molten surface of the resin molding 20. A resulting anchoring effect can be expected and the V-groove 42 can be formed in a short time in the resin molding 20, thus improving the operability while preventing occurrence of a defect in appearance.

Dependencies are inferred from the claim text.