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Title:
METHOD FOR RECOVERING PULP FIBERS FROM USED ABSORBENT ARTICLE
Document Type and Number:
WIPO Patent Application WO/2018/025499
Kind Code:
A1
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.

Inventors:
KONISHI, Takayoshi (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
HIRAOKA, Toshio (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
YAMAKI, Koichi (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
KAMEDA, Noritomo (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
Application Number:
JP2017/021539
Publication Date:
February 08, 2018
Filing Date:
June 09, 2017
Export Citation:
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Assignee:
UNICHARM CORPORATION (182 Shimobun, Kinsei-cho Shikokuchuo-sh, Ehime 11, 〒7990111, JP)
International Classes:
D21C5/02; A61L2/18; A61L11/00; B09B3/00; B09B5/00; B29B17/00; C08J11/26; A61L101/06; A61L101/10
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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