Title:
METHOD FOR PRODUCING RECYCLED PULP FIBERS, AND RECYCLED PULP FIBERS
Document Type and Number:
WIPO Patent Application WO/2019/003658
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for producing recycled pulp fibers such that articles using the recycled pulp fibers can easily achieve a uniform whiteness and users are not prone to feel psychological resistance to articles using the recycled pulp fibers. 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 multiple types of 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 the pulp fibers are bleached to form recycled pulp fibers; and a step for discharging the treatment solution (52) from a treatment solution discharge port (33), wherein the recycled pulp fibers have a 0-10 ΔYI with respect to a standard white plate.
Inventors:
KONISHI TAKAYOSHI (JP)
HIRAOKA TOSHIO (JP)
KURITA NORITOMO (JP)
HIRAOKA TOSHIO (JP)
KURITA NORITOMO (JP)
Application Number:
PCT/JP2018/018185
Publication Date:
January 03, 2019
Filing Date:
May 10, 2018
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; B09B3/00; B09B5/00; B29B17/00; C08J11/10; C08J11/16; C08J11/26
Domestic Patent References:
| WO2015190140A1 | 2015-12-17 | |||
| WO2014007105A1 | 2014-01-09 |
Foreign References:
| JP2017100133A | 2017-06-08 | |||
| JP2016000881A | 2016-01-07 |
Other References:
SHIGEO IMAI; MITSUHIRO WADA: "[Environmental Impact Assessment of Pulp Recycling by Recycling Used Paper Diapers: Environmental Assessment of Diaper Resource Recycling]", MEAT SCIENCE, vol. 15, no. 4, 1 July 2016 (2016-07-01), pages 85 - 89, XP009518008, ISSN: 1347-9970
"Agriculture", vol. 63, SHOWA, article "Soil diagnosis guidance", pages: 85 - 87
See also references of EP 3626881A4
"Agriculture", vol. 63, SHOWA, article "Soil diagnosis guidance", pages: 85 - 87
See also references of EP 3626881A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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