Title:
METHOD FOR PRODUCING PULP SHEET, AND DEHYDRATION IMPROVER FOR PULP SLURRY
Document Type and Number:
WIPO Patent Application WO/2021/111698
Kind Code:
A1
Abstract:
Provided are: a method which is for producing a pulp sheet and by which moisture content can be sufficiently lowered before a dryer part; and a dehydration improver for a pulp slurry. This method for producing a pulp sheet involves causing a pulp slurry to pass through a wire part, a press part, and a dryer part to dehydrate the pulp slurry, wherein the pulp slurry contains an ether-type nonionic surfactant. Moreover, this dehydration improver for a pulp slurry contains an ether-type nonionic surfactant, wherein the ether-type nonionic surfactant is a homopolymer of polyoxypropylene, or a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit, and the content of the polyoxypropylene chain in the copolymer is at least 85 mass%.
Inventors:
SURUGA KEIJI (JP)
SAIGUSA TAKASHI (JP)
YAMAMOTO HIDEO (JP)
WADA SATOSHI (JP)
SAIGUSA TAKASHI (JP)
YAMAMOTO HIDEO (JP)
WADA SATOSHI (JP)
Application Number:
PCT/JP2020/034414
Publication Date:
June 10, 2021
Filing Date:
September 11, 2020
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
D21H17/53; D21F13/00
Domestic Patent References:
| WO1998003730A1 | 1998-01-29 |
Foreign References:
| JP2016528399A | 2016-09-15 | |||
| JP2005530054A | 2005-10-06 | |||
| JPH01306693A | 1989-12-11 | |||
| JPS6440691A | 1989-02-10 | |||
| JP2003105685A | 2003-04-09 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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