US 12,392,445 B2
Composite type heat insulator and method for producing the same
Naoyuki Oya, Osaka (JP); Kimihiko Sugiura, Osaka (JP); Shuya Kawaoka, Osaka (JP); Kenji Imae, Osaka (JP); and Yoshihiko Imae, Osaka (JP)
Assigned to IMAE INDUSTRY CO., LTD., Osaka (JP)
Appl. No. 17/299,992
Filed by IMAE INDUSTRY CO., LTD., Osaka (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009564
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2021/095279, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-206787 (JP), filed on Nov. 15, 2019.
Prior Publication US 2022/0018485 A1, Jan. 20, 2022
Int. Cl. F16L 59/02 (2006.01); B32B 5/02 (2006.01); B32B 9/04 (2006.01)
CPC F16L 59/028 (2013.01) [B32B 5/02 (2013.01); B32B 9/04 (2013.01); F16L 59/029 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2262/10 (2013.01); B32B 2307/304 (2013.01); B32B 2307/732 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A composite heat insulator comprising
a first cloth, a second cloth, and a heat insulating layer interposed between the first cloth and the second cloth, the first cloth being in direct contact with the heat insulating layer and the second cloth being in direct contact with the heat insulating layer,
wherein the first and second cloths comprise a plurality of silica fibers having a hydroxyl group,
wherein the heat insulating layer contains silica aerogel and a plurality of silica staple fibers each having a length in the range from 0.5 to 5 mm,
wherein the amount ratio of the silica staple fiber to the silica aerogel (silica staple fiber:silica aerogel) is in the range from 8:2 to 5:5 in weight in the absence of a film-forming binder, and
wherein the silica aerogel is held by the silica staple fibers.