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1. (WO2018025501) METHOD FOR RECOVERING PULP FIBERS FROM USED ABSORBENT ARTICLE

Pub. No.:    WO/2018/025501    International Application No.:    PCT/JP2017/021541
Publication Date: Fri Feb 09 00:59:59 CET 2018 International Filing Date: Sat Jun 10 01:59:59 CEST 2017
IPC: D21C 5/02
B09B 3/00
B09B 5/00
B29B 17/02
C08J 11/06
C08J 11/16
Applicants: UNICHARM CORPORATION
ユニ・チャーム株式会社
Inventors: KONISHI, Takayoshi
小西 孝義
HIRAOKA, Toshio
平岡 利夫
YAMAKI, Koichi
八巻 孝一
KAMEDA, Noritomo
亀田 範朋
Title: METHOD FOR RECOVERING PULP FIBERS FROM USED ABSORBENT ARTICLE
Abstract:
A method is provided for recovering pulp fibers having little damage from a used absorbent article that contains pulp fibers and a superabsorbent polymer. The used absorbent article is treated at a temperature of greater than or equal to 80°C with an organic acid aqueous solution having a pH no greater than 2.5, and the superabsorbent polymer is deactivated. Preferably, the pulp fibers and the deactivated superabsorbent polymer are separated from the used absorbent article after treatment with the organic acid aqueous solution, and further, a mixture including the separated pulp fibers and deactivated superabsorbent polymer is treated with an oxidizing agent, the deactivated superabsorbent polymer is decomposed, reduced in molecular weight and solubilized.