Title:
古紙パルプの製造方法及び古紙パルプ
Document Type and Number:
Japanese Patent JP7251992
Kind Code:
B2
Abstract:
To provide a manufacturing method of a waste paper pulp from a waste paper pulp raw material containing waste paper including gypsum and a waste paper pulp thereof.SOLUTION: The manufacturing method of a waste paper pulp includes: a disintegration step for preparing a slurry by blending a waste paper pulp raw material 11 including 0.1-10 mass% of a waste paper containing a gypsum component; a coarse selection step for obtaining a first residue by separating heavy foreign matters included in the slurry based on specific gravity difference; and a precision selection step for obtaining a second residue by separating large foreign matters included in the first residue based on size standard; wherein the disintegration step is characterized by adding an ion sequestering agent and blending at a temperature lower than 50°C.SELECTED DRAWING: Figure 1
Inventors:
Takayuki Kaminaga
Application Number:
JP2019014662A
Publication Date:
April 04, 2023
Filing Date:
January 30, 2019
Export Citation:
Assignee:
Daio Paper Co., Ltd.
International Classes:
D21C5/02
Domestic Patent References:
| JP2009057645A | ||||
| JP2009057667A | ||||
| JP2013159865A |
Attorney, Agent or Firm:
Patent Attorney Corporation Nagai International Patent Office