Title:
METHOD AND SYSTEM FOR RECOVERING PULP FIBERS FROM USED ABSORBENT ARTICLES
Document Type and Number:
WIPO Patent Application WO/2019/087489
Kind Code:
A1
Abstract:
Provided is a method for highly efficiently removing a highly water-absorbent polymer from pulp fibers that have been separated from used absorbent articles and include residual highly water-absorbent polymer. A method for recovering pulp fibers from used absorbent articles that include the pulp fibers and a highly water-absorbent polymer, the method comprising: a solid-liquid separation step (S18) in which a deactivating aqueous solution that includes pulp fibers and highly water-absorbent polymer that have been separated from the used absorbent articles is separated into a solid that includes the pulp fibers and the highly water-absorbent polymer and a liquid that includes the highly water-absorbent polymer and the deactivating aqueous solution and, meanwhile, the highly water-absorbent polymer is smashed; and an oxidizing agent treatment step (S19) in which the pulp fibers and smashed highly water-absorbent polymer included in the separated solid are treated with an aqueous solution that includes an oxidizing agent.
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Inventors:
KONISHI TAKAYOSHI (JP)
HIRAOKA TOSHIO (JP)
KATO TAKASHI (JP)
KURITA NORITOMO (JP)
HIRAOKA TOSHIO (JP)
KATO TAKASHI (JP)
KURITA NORITOMO (JP)
Application Number:
PCT/JP2018/028155
Publication Date:
May 09, 2019
Filing Date:
July 26, 2018
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
C08J11/16; B09B3/00; B09B5/00; B29B17/02; B29B17/04
Domestic Patent References:
| WO2015190140A1 | 2015-12-17 | |||
| WO2017179252A1 | 2017-10-19 |
Foreign References:
| JP2002273731A | 2002-09-25 | |||
| JP2001047023A | 2001-02-20 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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