Patent ID: 8887863
Filing Date: 2014-11-18
Classification: D04H,F01N,Y02A,Y10T

Abstract:
1. A mat member for a muffler comprising: fibers consisting of inorganic fibers; a first surface having a plurality of needle penetration marks and/or a plurality of needle protrusion marks; and a second surface opposite to the first surface having a plurality of needle protrusion marks and/or a plurality of needle penetration marks, a plurality of needle marks being formed in the mat member by needle punching and extending from the needle penetration mark to the needle protrusion mark b using a needle having a plurality of spine-shaped intrusions that protrude toward a tip direction formed substantially all over a side surface of a tip portion, an inorganic fiber bundle formed at said needle protrusion mark and including a plurality of said inorganic fibers oriented in a closed loop configuration, the plurality of said inorganic fibers oriented in the closed loop configuration being formed by punching a sheet member which includes inorganic fiber precursor with the needle to form said inorganic fiber precursor oriented in a closed loop and by firing the inorganic fiber precursor oriented in the closed loop, wherein the inorganic fiber precursor is manufactured by spinning a spinning mixture containing at least an inorganic compound and an organic polymer and wherein the inorganic fiber precursor comprises the organic polymer and inorganic compound and firing removes the organic polymer.