CPC D04H 1/46 (2013.01) [D04H 1/4209 (2013.01); F01N 3/2835 (2013.01); F01N 3/2853 (2013.01); B01D 65/10 (2013.01); D04H 3/105 (2013.01); D04H 5/02 (2013.01); D10B 2101/02 (2013.01); D10B 2101/06 (2013.01); D10B 2101/08 (2013.01); F01N 3/285 (2013.01); F01N 3/2857 (2013.01); F01N 3/2864 (2013.01); F01N 3/2867 (2013.01); F01N 13/148 (2013.01); F01N 2310/04 (2013.01); F01N 2330/06 (2013.01); F01N 2330/10 (2013.01); F01N 2330/102 (2013.01); F01N 2330/12 (2013.01); F01N 2340/00 (2013.01); F01N 2530/20 (2013.01)] | 8 Claims |
1. An article, comprising:
inorganic fibers; and
needle marks extending in a thickness direction and each including a vertical bundle comprising inorganic fibers extending in the thickness direction,
wherein
(I) an average volume of an effective vertical bundles per needle mark (v/n), determined by dividing a total volume of the effective vertical bundles in the region (v) by the number of the needle marks in the region (n), is 1.0 mm3 or more,
wherein the effective vertical bundles are vertical bundles having a diameter of 100 μm or more and a protruding length of 2 mm or more among vertical bundles protruding from peeled surfaces in a region measuring 50 mm×50 mm after a peel test is performed, and
in the peel test, a test specimen having a width of 50 mm and a length of 150 mm is cut out from the article, a cut having a depth of 30 mm is made in a middle of a thickness of an end face of the test specimen, and both ends formed by the cut are held by gripping jigs, mounted on a tensile testing machine, and pulled in opposite thickness directions at a speed of 500 mm/min into two pieces, or
(II) an average volume per the effective vertical bundle (V/N), determined by dividing the total volume of the effective vertical bundles (V) by the number of the effective vertical bundles (N), is 3.0 mm3 or more.
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