US 11,981,117 B2
Liquid absorbing sheet
Shogo Nakada, Nagano (JP); Taiki Kono, Nagano (JP); and Akihiro Toya, Nagano (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 14, 2022, as Appl. No. 17/650,864.
Claims priority of application No. 2021-021508 (JP), filed on Feb. 15, 2021.
Prior Publication US 2022/0258451 A1, Aug. 18, 2022
Int. Cl. B32B 7/14 (2006.01); B32B 5/02 (2006.01); B32B 27/12 (2006.01); B41J 29/17 (2006.01)
CPC B32B 7/14 (2013.01) [B32B 5/02 (2013.01); B32B 27/12 (2013.01); B41J 29/17 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2307/718 (2013.01); B32B 2307/726 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A liquid absorbing sheet comprising:
a receiving base material which has a liquid permeability and which includes a first base material, a second base material, and a bonding portion at which at least a part of an outermost edge of the first base material and at least a part of an outermost edge of the second base material are bonded to each other, the first base material and the second base material being composed of a material including fibers; and
a water absorbing resin which has a water absorbing property, which is swelled in association with water absorption, and which is received in a portion between the first base material and the second base material surrounded by the bonding portion,
wherein
the bonding portion defines at least a part of an outermost edge of the liquid absorbing sheet and has a first breaking part having a width smaller than the other part of the bonding portion,
the at least the part of the outermost edge of the first base material and the at least the part of the outermost edge of the second base material are bonded by a water-soluble adhesive that is soluble to the liquid, and
the bonding portion is at least partially broken at the first breaking part when the water absorbing resin is swelled and the water-soluble adhesive is dissolved by the liquid so that the water absorbing resin flows out of the receiving base material through a broken section of the bonding portion.