Title:
METHOD FOR PRODUCING RECYCLED PULP FIBER FROM USED ABSORBENT ARTICLE CONTAINING HIGHLY WATER-ABSORBENT POLYMER, PULP FIBER, AND EXCREMENT
Document Type and Number:
WIPO Patent Application WO/2020/217757
Kind Code:
A1
Abstract:
Provided is a method which is for producing a recycled pulp fiber from a used absorbent article and by which an aqueous solution recovered in a production step can be reused and the amount of water used as the aqueous solution can be reduced. Said method includes: a separating step (S10) for respectively separating an inactivating aqueous solution containing excrement and a pulp fiber from a mixed liquid obtained by mixing an inactivating aqueous solution capable of inactivating a highly water-absorbent polymer with a used absorbent article; a viscosity-reducing step (S22) for mixing a first oxidizing agent capable of decomposing excrement with the separated inactivating aqueous solution to decompose the excrement contained in the inactivating aqueous solution and reduce the viscosity of the inactivating aqueous solution; and a re-supplying step (S24) for returning, to the separating step, the inactivating aqueous solution containing a decomposition product formed by decomposing the excrement.
Inventors:
KONISHI TAKAYOSHI (JP)
HIRAOKA TOSHIO (JP)
KURITA NORITOMO (JP)
HIRAOKA TOSHIO (JP)
KURITA NORITOMO (JP)
Application Number:
PCT/JP2020/010371
Publication Date:
October 29, 2020
Filing Date:
March 10, 2020
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; B09B5/00; B29B17/02; C08J11/06; C08J11/08; C08J11/16; D21B1/32
Domestic Patent References:
| WO2016103985A1 | 2016-06-30 | |||
| WO2019087489A1 | 2019-05-09 |
Foreign References:
| JP2000084533A | 2000-03-28 | |||
| JP2001047096A | 2001-02-20 | |||
| JP2017193819A | 2017-10-26 | |||
| JP2019058906A | 2019-04-18 | |||
| JP2016000881A | 2016-01-07 |
Other References:
See also references of EP 3940141A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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