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Title:
PRODUCTION OF REGENERATED PULP
Document Type and Number:
Japanese Patent JPH0441789
Kind Code:
A
Abstract:

PURPOSE: To efficiently deink printing ink and to obtain the title pulp formula with excellent whiteness by carrying out defibration process and kneading process having a specific old paper pulp concentration and a specific alkali concentration, respectively, and then effecting an aging process.

CONSTITUTION: In a process of production of regenerated pulp, old paper pulp is subjected to a defibration process at 10-20wt.% old paper pulp concentration and ≤2.5d/l caustic alkali concentration (calculated as NaOH), to a kneading process at 20-40wt.% pulp concentration and 0.5-4.0g/l alkali concentration, and is mixed with hydrogen peroxide and sodium silicate in an aging process to give the objective regenerated pulp.


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Inventors:
KURAMOTO SETSUO
FUJITA YOSHIO
UCHIMURA SHUNICHI
YAMAMOTO HISASHI
Application Number:
JP14205990A
Publication Date:
February 12, 1992
Filing Date:
May 31, 1990
Export Citation:
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Assignee:
KANZAKI PAPER MFG CO LTD
International Classes:
D21C3/26; D21C5/02; (IPC1-7): D21C3/26; D21C5/02



 
Next Patent: MILDEWPROOF TREATMENT OF PULP