Title:
How to recover pulp fibers from used absorbent articles
Document Type and Number:
Japanese Patent JP6324447
Kind Code:
B2
Abstract:
A method is provided for recovering pulp fibers having little damage from a used absorbent article which includes a water permeable front sheet, a water impermeable back sheet and an absorbent body that contains pulp fibers and a superabsorbent polymer. At least one opening with a circle equivalent diameter of 5-45 mm, or 10-45 mm cut, is made in the front sheet and/or the back sheet of the used absorbent article, which is then agitated in an organic acid aqueous solution with a pH of less than or equal to 2.5, and the superabsorbent polymer is deactivated and the pulp fibers and superabsorbent polymer are discharged from the used absorbent article through the opening or cut. Preferably, the pulp fibers and the deactivated superabsorbent polymer are then separated, the separated pulp fibers and deactivated superabsorbent polymer are further treated with an oxidizing agent, and the deactivated superabsorbent polymer is decomposed, reduced in molecular weight and solubilized.
Inventors:
Takayoshi Konishi
Toshio Hiraoka
Koichi Yamaki
Kameda Noriho
Toshio Hiraoka
Koichi Yamaki
Kameda Noriho
Application Number:
JP2016154964A
Publication Date:
May 16, 2018
Filing Date:
August 05, 2016
Export Citation:
Assignee:
UNI-CHARM CO.,LTD.
International Classes:
D21C5/02; A61F13/84; B09B3/00; B09B5/00; B29B17/02; C08J11/26
Domestic Patent References:
| JP2014217835A | ||||
| JP2016123973A |
Foreign References:
| WO2015190140A1 |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Atsushi Ebiya
Hiroyuki Onoda
Okuno Takenori
Kenji Fujimoto
Takashi Ishida
Tetsuji Koga
Atsushi Ebiya
Hiroyuki Onoda
Okuno Takenori
Kenji Fujimoto
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