Mat member, method for manufacturing the mat member, muffler and method for manufacturing the muffler
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United States of America Patent
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Nov 18, 2014
Issued Date -
N/A
app pub date -
Oct 6, 2008
filing date -
Apr 30, 2008
priority date (Note) -
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Abstract
A mat member includes inorganic fibers, a first surface and a second surface opposite to the first surface. The first surface has a plurality of needle penetration marks and/or a plurality of needle protrusion marks. The second surface has a plurality of needle protrusion marks and/or a plurality of needle penetration marks. A plurality of needle marks are formed in the mat member by needle punching and extend from the needle penetration mark to the needle protrusion mark. An inorganic fiber bundle which includes a plurality of the inorganic fibers oriented in a closed loop configuration is formed at the needle protrusion mark.
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