RECOVERY OF FIBER

• Main Authors: HANYA TAKAHIRO, HIRAKAWA KAZUMI, TAKAHASHI MIKIAKI
• Format: Patent
• Language: English
• Published: 04.03.1997
• Edition: 6
• Subjects: APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PAPER-MAKING; PRODUCTION OF CELLULOSE; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TEXTILES; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To improve the quality of recycled paper by selectively separating and recovering a useful fiber component by a flotation treatment of an alkaline waste solution discharged from a paper making process or a waste paper treating process and blending the recovered fiber component to recycled paper. SOLUTION: In this recovery of fiber, useful fibers having >=0.10mm average fiber length and included in white water are selectively separated and recovered by floating the white water having 8.5-12pH and discharged in a washing process of a suspension of newspaper waste pulp in >=0.015 gas/liquid ratio by a flotation device. By blending the recovered fibers, especially blending with a raw material for board paper, paper having improved strength can be obtained.