Title:
METHOD FOR IMPROVING FREENESS OF PAPER-MAKING PULP
Document Type and Number:
Japanese Patent JP2838003
Kind Code:
B2
Abstract:
PURPOSE: To obtain paper-making pulp giving a high-quality recycled paper for corrugated cardboard, etc., and having improved freeness by contacting pulp with a specific amount of a cellulolytic enzyme and treating with a flocculant composed of a water-soluble cationic polymer.
CONSTITUTION: A cellulolytic enzyme (e.g. cellulase) is added to pulp in an amount of ≥0.05% based on the dry weight of the pulp, both components are brought into contact with each other at ≥20°C for ≥20 min and the pulp is treated with ≥0.007% flocculant composed of a water-soluble cationic polymer (e.g. copolymer of acrylamide and diallyldimethyl ammonium chloride) based on the dry weight of the pulp. The aqueous suspension of recycled pulp is refined and paper pulp having improved freeness and useful for the manufacture of corrugated cardboard, etc., can be produced in high efficiency by this process.
Inventors:
JAUETSUDO EMU SAAKAA
DEBITSUDO AARU KOSUPARU
DEBITSUDO AARU KOSUPARU
Application Number:
JP26828292A
Publication Date:
December 16, 1998
Filing Date:
October 07, 1992
Export Citation:
Assignee:
NARUKO CHEM CO
International Classes:
D21C5/00; D21C9/00; D21D1/00; C12S3/08; D21H11/14; D21H17/00; D21H17/37; D21H17/45; D21H21/10; (IPC1-7): D21C9/00; C12S3/08; D21D1/00
Domestic Patent References:
| JP26681A | ||||
| JP1162897A | ||||
| JP55137298A | ||||
| JP5751899A | ||||
| JP63283800A |
Other References:
【文献】欧州特許出願公開351655(EP,A)
Attorney, Agent or Firm:
Aoki Akira (3 outside)
Previous Patent: MONITOR METHOD FOR UNSTABLENESS IN OUTPUT OF ATOMIC REACTOR
Next Patent: SIMULTANEOUS MULTI-ADDRESS SYSTEM FOR PICTURE INFORMATION
Next Patent: SIMULTANEOUS MULTI-ADDRESS SYSTEM FOR PICTURE INFORMATION