Search International and National Patent Collections

1. (WO2018025499) METHOD FOR RECOVERING PULP FIBERS FROM USED ABSORBENT ARTICLE

Pub. No.:    WO/2018/025499    International Application No.:    PCT/JP2017/021539
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
A61L 2/18
A61L 11/00
B09B 3/00
B09B 5/00
B29B 17/00
C08J 11/26
A61L 101/06
A61L 101/10
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 which includes a water permeable front sheet, a water impermeable back sheet and an absorbent body that contains pulp fibers and a superabsorbent polymer. At least one opening with a circle equivalent diameter of 5-45 mm, or 10-45 mm cut, is made in the front sheet and/or the back sheet of the used absorbent article, which is then agitated in an organic acid aqueous solution with a pH of less than or equal to 2.5, and the superabsorbent polymer is deactivated and the pulp fibers and superabsorbent polymer are discharged from the used absorbent article through the opening or cut. Preferably, the pulp fibers and the deactivated superabsorbent polymer are then separated, the separated pulp fibers and deactivated superabsorbent polymer are further treated with an oxidizing agent, and the deactivated superabsorbent polymer is decomposed, reduced in molecular weight and solubilized.