METHOD FOR DEINKING WASTE PAPER

PURPOSE:To readily obtain recycled paper of high whiteness by using a deinking agent having a higher cloud point than the flotation treating temperature and a deinking agent having a lower cloud point than that, subjecting printed waste paper to the flotation treatment and efficiently peeling the in...

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Bibliographische Detailangaben
Hauptverfasser:	MASAMIZU KOJI, HIRAKOUCHI YOSHIE, ADACHI IKUO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR 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 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
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Beschreibung
Zusammenfassung:	PURPOSE:To readily obtain recycled paper of high whiteness by using a deinking agent having a higher cloud point than the flotation treating temperature and a deinking agent having a lower cloud point than that, subjecting printed waste paper to the flotation treatment and efficiently peeling the ink from the printed waste paper in disintegration. CONSTITUTION:Printed waste paper which is a raw material is cut to 3X3cm size and placed in a pulp disintegrator. Caustic soda in an amount of 1.0% based on the weight of the raw material printed waste paper, sodium silicate No.3 in an amount of 3.5% based on the weight of the raw material printed waste paper, hydrogen peroxide in an amount of 1.0% (active component) based on the weight of the raw material printed waste paper, a deinking agent having a higher cloud point than the flotation treating temperature (e.g. polyethylene glycol monostearyl ether) and a deinking agent having a lower cloud point than the flotation treating temperature (e.g. lauryloxy- polypropylene oxide-polyethylene oxide-polypropylene oxide-block polymer) are used in combination and hot water is added so as to provide 5% pulp concentration. The disintegrating treatment is then carried out at 35 deg.C and the flotation treatment is performed at 30-50 deg.C to prepare a pulp sheet. Thereby, the recycled pulp of high whiteness with hardly any residual ink is efficiently obtained.