	US 12,071,728 B2
	Method for manufacturing paper barrier base material
Yuri Oishi, Tokyo (JP); Kenta Watanabe, Tokyo (JP); Satoshi Tsuda, Tokyo (JP); Masashi Okamoto, Kauttua (FI); and Hiroshi Koyamoto, Tokyo (JP)
Assigned to NIPPON PAPER INDUSTRIES CO., LTD., Tokyo (JP); and JUJO THERMAL OY, Kauttua (FI)
Appl. No. 17/598,618
Filed by NIPPON PAPER INDUSTRIES CO., LTD., Tokyo (JP); and JUJO THERMAL OY, Kauttua (FI)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/013898 § 371(c)(1), (2) Date Sep. 27, 2021, PCT Pub. No. WO2020/203721, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-067070 (JP), filed on Mar. 29, 2019; and application No. 2019-067071 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0213652 A1, Jul. 7, 2022
Int. Cl. D21H 21/16 (2006.01); D21H 19/36 (2006.01); D21H 19/82 (2006.01); D21H 23/48 (2006.01); D21H 27/10 (2006.01)

CPC D21H 21/16 (2013.01) [D21H 19/36 (2013.01); D21H 19/82 (2013.01); D21H 23/48 (2013.01); D21H 27/10 (2013.01)]

15 Claims

3. A method for manufacturing a paper barrier base material, comprising:

a step of applying a water vapor barrier layer coating liquid that contains at least a water vapor barrier resin and a pigment onto a paper base material by a curtain coating method to form a water vapor barrier layer,

wherein the water vapor barrier layer coating liquid has a spinnability of 0.07 seconds or more and 0.4 seconds or less at a solid content concentration of 32% by weight and a temperature of 25° C.,

wherein the water vapor barrier layer coating liquid contains a viscosity modifier, and

wherein the viscosity modifier contains sodium polyacrylate.