Login| Sign Up| Help| Contact|

Patent Searching and Data


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.

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)
Application Number:
JP2015/056959
Publication Date:
December 17, 2015
Filing Date:
March 10, 2015
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
UNICHARM CORPORATION (182 Shimobun, Kinsei-cho Shikokuchuo-sh, Ehime 11, 〒7990111, JP)
International Classes:
D21C5/02; B09B3/00; D21B1/32
Domestic Patent References:
2014-01-09
Foreign References:
JP2015086483A2015-05-07
JP2014217835A2014-11-20
JP2013150976A2013-08-08
JP2009183893A2009-08-20
JPH06184970A1994-07-05
US20070137805A12007-06-21
Other References:
See also references of EP 3156541A4
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)
Download PDF: