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Title:
METHOD FOR PRODUCING PULP FIBERS FOR CELLULOSE NANOFIBERIZATION, AND PULP FIBERS FOR CELLULOSE NANOFIBERIZATION
Document Type and Number:
WIPO Patent Application WO/2019/003655
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method which is for producing pulp fibers for cellulose nanofiberization from pulp fibers of used sanitary products, and which can produce pulp fibers for cellulose nanofiberization that have low lignin content and a low distribution thereof and that have excellent cellulose nanofiberization properties. This method is described below. The method is characterized by involving: a step for supplying, from a mixed solution supply port (32) to a treatment tank (31), a mixed solution (51) which contains superabsorbent polymers and pulp fibers derived from used sanitary products; a step for supplying an ozone-containing gas (53) from an ozone-containing gas supply port (43) to a treatment solution (52) inside of the treatment tank (31); a step in which, by raising the ozone-containing gas (53) while lowering the superabsorbent polymers and pulp fibers in the treatment tank (31), the ozone-containing gas (53) is brought into contact with the superabsorbent polymers and the pulp fibers, and pulp fibers for cellulose nanofiberization are formed from the pulp fibers; and a step for discharging the treatment solution (52) from a treatment solution discharge port (33), wherein the pulp fibers for cellulose nanofiberization have a lignin content of less than or equal to 0.1 mass%.

Inventors:
KONISHI TAKAYOSHI (JP)
HIRAOKA TOSHIO (JP)
KURITA NORITOMO (JP)
Application Number:
PCT/JP2018/018175
Publication Date:
January 03, 2019
Filing Date:
May 10, 2018
Export Citation:
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Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; A61L2/18; A61L11/00; B09B3/00; B09B5/00; B29B17/00; C08J11/10; C08J11/16; C08J11/26; A61L101/10
Domestic Patent References:
WO2015190140A12015-12-17
Foreign References:
JP2017100133A2017-06-08
JP2000084533A2000-03-28
JP2016000881A2016-01-07
JP2010235681A2010-10-21
JP2010254726A2010-11-11
Other References:
See also references of EP 3626882A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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