Process for preparing pulp for paper making

Details Process for preparing pulp for paper making Process for preparing pulp for paper making

1987-07-31

1989-01-17

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Defibration by projection or explosion

162 78, 162 84, 162 86, D21B 136, D21C 300, D21C 304

Patent

active

047986514

ABSTRACT:
This invention relates to an improved process for preparing pulp suitable for paper making. Although processes using explosive decompression have been known in the past, it has been believed that these must be conducted at relatively low temperatures. Although such known processes of explosive decompression resulted in a saving of power, the physical strength was low, the color was relatively dark and there was a considerable yield loss. This invention is to provide a process to achieve the saving of power resulting from the use of explosive decompression but in which there is good brightness, high yield and good fiber strength. The process of this invention defines conditions for achieving these objectives. These conditions include impregnation of the chips of other wood fragments under specified conditions and cooking with saturated steam at a high temperature and pressure followed by explosive decompression and refining.

REFERENCES:
Explosion Pulping of Annual and Fast Growing Plants, Mamers, Menz et al Appita Nov. 1979, p. 201.
Possibilities for Reduction of Energy Requirements during Chip Refining Puri and Higgins, Appita vol. 37, No. 6, p. 496, May 1984.
The Siropulper-a New Concept in Wastepaper Recovery, Mamers. Appita, vol. 32, No. 2, Sep. 1978.
New Pulping Process Solves Paper Recycling Problems Canadian Pulp and Paper Industry, vol. 32, No. 19,:79 (Nov. 1979).
Asplund Svenk Pappersted (1953) 56, 550.
Higgins et al Appita 32(3) 187-200 (Nov. 1978).

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