BLEACHING MECHANICAL WOODPULP

Cellulose pulp si prepd. by refining chips, partic. a thermo-mechanical pulp prepd. from steam-preheated chips with addn. of silicate e.g. Na silicate. Bleaching takes place esp. after a pre-treatment with a complexing agent, e.g. ethylene diamine tetraacetic acid, or with CaCl2. In the initial blea...

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Hauptverfasser:	PER-OLOV LINDBLAD, GORAN ERIK ANNERGREN
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES
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creator	PER-OLOV LINDBLAD GORAN ERIK ANNERGREN
description	Cellulose pulp si prepd. by refining chips, partic. a thermo-mechanical pulp prepd. from steam-preheated chips with addn. of silicate e.g. Na silicate. Bleaching takes place esp. after a pre-treatment with a complexing agent, e.g. ethylene diamine tetraacetic acid, or with CaCl2. In the initial bleaching phase, alkalinity of bleaching liq. is such that the liq. has a Ph of 11-12 (11.5-12) measured in pulp suspension. Quantity of silicate added to reduce buffer capacity of system is 50, esp. 30 kg/t of absolutely dry pulp, so that pH 9-10.5 (9.5-10) measured in pulp suspension is achieved during end-phase of bleaching. Brightness values of 80% SCAN are achieved.
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Bleaching takes place esp. after a pre-treatment with a complexing agent, e.g. ethylene diamine tetraacetic acid, or with CaCl2. In the initial bleaching phase, alkalinity of bleaching liq. is such that the liq. has a Ph of 11-12 (11.5-12) measured in pulp suspension. Quantity of silicate added to reduce buffer capacity of system is 50, esp. 30 kg/t of absolutely dry pulp, so that pH 9-10.5 (9.5-10) measured in pulp suspension is achieved during end-phase of bleaching. Brightness values of 80% SCAN are achieved.</description><language>eng</language><subject>APPARATUS THEREFOR ; PAPER-MAKING ; PRODUCTION OF CELLULOSE ; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS ; REGENERATION OF PULPING LIQUORS ; TEXTILES</subject><creationdate>1978</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19780803&DB=EPODOC&CC=AU&NR=2157077A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19780803&DB=EPODOC&CC=AU&NR=2157077A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>PER-OLOV LINDBLAD</creatorcontrib><creatorcontrib>GORAN ERIK ANNERGREN</creatorcontrib><title>BLEACHING MECHANICAL WOODPULP</title><description>Cellulose pulp si prepd. by refining chips, partic. a thermo-mechanical pulp prepd. from steam-preheated chips with addn. of silicate e.g. Na silicate. Bleaching takes place esp. after a pre-treatment with a complexing agent, e.g. ethylene diamine tetraacetic acid, or with CaCl2. In the initial bleaching phase, alkalinity of bleaching liq. is such that the liq. has a Ph of 11-12 (11.5-12) measured in pulp suspension. Quantity of silicate added to reduce buffer capacity of system is 50, esp. 30 kg/t of absolutely dry pulp, so that pH 9-10.5 (9.5-10) measured in pulp suspension is achieved during end-phase of bleaching. 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subjects	APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES
title	BLEACHING MECHANICAL WOODPULP
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