CHEMICAL, THERMAL AND MECHANICAL PULP PRODUCTION FOR SEPARATELY PERFORMING TREATMENT DUE TO ALKALI AND SULFITE

Title:

CHEMICAL, THERMAL AND MECHANICAL PULP PRODUCTION FOR SEPARATELY PERFORMING TREATMENT DUE TO ALKALI AND SULFITE

Document Type and Number:

Japanese Patent JPS60110994

Kind Code:

A

Abstract:

A high yield chemithermomechanical (CTMP) process for obtaining high strength hardwood pulps is disclosed wherein hardwood chips are subjected to a two-stage chemical treatment prior to defibration, the first consisting of chip impregnation and reaction with an alkaline liquor followed by a second stage treatment with sulfite and/or bisulfite; in one embodiment peroxide is added to the alkaline liquor to enhance brightness.

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Inventors:

ZENON KASHIMIRU PURASASU

Application Number:

JP23226984A

Publication Date:

June 17, 1985

Filing Date:

November 02, 1984

Export Citation:

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Assignee:

MEAD CORP

International Classes:

D21B1/02; D21C3/22; D21C1/06; D21C1/08; D21C3/12; (IPC1-7): D21C3/22

Attorney, Agent or Firm:

Kyozo Yuasa

Previous Patent: JPS60110993

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