Title:
METHOD FOR MANUFACTURING RECYCLED PULP FROM USED SANITARY PRODUCTS
Document Type and Number:
WIPO Patent Application WO/2015/190140
Kind Code:
A1
Abstract:
A recycled pulp that is reusable as sanitary products is efficiently manufactured by recovering pulp fiber from used sanitary products containing the pulp fiber and a polymer absorbent. The method of the present invention comprises: a step for applying a mechanical force to the used sanitary products in an aqueous solution containing a polyvalent metal ion or an acidic aqueous solution with a pH of 2.5 or lower and thus degrading the used sanitary products into the pulp fiber and other materials; a step for separating the pulp fiber from the mixture of the pulp fiber and other materials that has been formed in the degradation step; and a step for treating the pulp fiber thus separated with an ozone-containing aqueous solution with a pH of 2.5 or lower.
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Inventors:
KONISHI TAKAYOSHI (JP)
HIRAOKA TOSHIO (JP)
HIRAOKA TOSHIO (JP)
Application Number:
PCT/JP2015/056959
Publication Date:
December 17, 2015
Filing Date:
March 10, 2015
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; B09B3/00; D21B1/32
Domestic Patent References:
| WO2014007105A1 | 2014-01-09 |
Foreign References:
| JP2015086483A | 2015-05-07 | |||
| JP2014217835A | 2014-11-20 | |||
| JP2013150976A | 2013-08-08 | |||
| JP2009183893A | 2009-08-20 | |||
| JPH06184970A | 1994-07-05 | |||
| US20070137805A1 | 2007-06-21 |
Other References:
See also references of EP 3156541A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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