Title:
RECYCLED PULP FIBER MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/123766
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a recycled pulp fiber manufacturing method with which it is possible to easily obtain recycled pulp fibers containing less of a high water-absorption polymer without requiring any mechanical equipment such as an ozone generation apparatus. This method is for manufacturing recycled pulp fibers from used sanitary goods including pulp fibers and a high water-absorption polymer, and is characterized by comprising: an inactivation step (S1) for immersing a sanitary goods constituent material in an acid-containing aqueous solution so as to inactivate the high water-absorption polymer; a high water-absorption polymer degradation step (S3) for generating chlorine dioxide by adding a chlorine dioxide generating material, which is capable of generating chlorine dioxide through reaction with an acid, to the acid-containing aqueous solution that has undergone the inactivation step (S1), and then degrading the inactivated high water-absorption polymer using said chlorine dioxide; and a recycled pulp fiber recovery step (S4) for recovering the recycled pulp fibers from the acid-containing aqueous solution that has undergone the high water-absorption polymer degradation step (S3).
Inventors:
KONISHI TAKAYOSHI (JP)
Application Number:
PCT/JP2018/036911
Publication Date:
June 27, 2019
Filing Date:
October 02, 2018
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; B09B3/00; B09B5/00; B29B17/02; C08J11/16; D21B1/32
Domestic Patent References:
| WO2016047294A1 | 2016-03-31 |
Foreign References:
| JP2017113736A | 2017-06-29 | |||
| JP2003190928A | 2003-07-08 | |||
| JP2013150976A | 2013-08-08 | |||
| JP2010084031A | 2010-04-15 | |||
| JP2001316519A | 2001-11-16 | |||
| JP2013520244A | 2013-06-06 | |||
| JP2003039023A | 2003-02-12 | |||
| US20140230322A1 | 2014-08-21 | |||
| JP2016000881A | 2016-01-07 |
Other References:
See also references of EP 3712325A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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