US 12,110,622 B2
Inorganic fiber-formed article, mat for exhaust gas cleaning apparatus, and exhaust gas cleaning apparatus
Yusuke Kimura, Tokyo (JP); Hirokazu Morita, Tokyo (JP); Kazunori Kawahara, Tokyo (JP); Masanobu Yomogida, Tokyo (JP); and Hiromitsu Tsutsui, Tokyo (JP)
Assigned to MAFTEC CO., LTD., Tokyo (JP)
Filed by MAFTEC CO., LTD., Tokyo (JP)
Filed on Sep. 24, 2021, as Appl. No. 17/484,292.
Application 17/484,292 is a continuation of application No. PCT/JP2020/029992, filed on Aug. 5, 2020.
Claims priority of application No. 2019-144390 (JP), filed on Aug. 6, 2019; and application No. 2020-092409 (JP), filed on May 27, 2020.
Prior Publication US 2022/0010470 A1, Jan. 13, 2022
Int. Cl. D04H 1/46 (2012.01); D04H 1/4209 (2012.01); F01N 3/28 (2006.01)
CPC D04H 1/46 (2013.01) [D04H 1/4209 (2013.01); F01N 3/2835 (2013.01); F01N 3/2853 (2013.01); D10B 2101/02 (2013.01); D10B 2101/08 (2013.01); F01N 2330/06 (2013.01); F01N 2330/10 (2013.01); F01N 2340/00 (2013.01)] 8 Claims
OG exemplary drawing
 
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) the article has a basis weight of 1,800 g/m2 or more, and
(II-1) 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 0.5 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-2) an average volume per an 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 1.0 mm3 or more.