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WO2008110191A1 - Procédé de fabrication de fibres chargées - Google Patents

Procédé de fabrication de fibres chargées Download PDF

Info

Publication number
WO2008110191A1
WO2008110191A1 PCT/EP2007/009957 EP2007009957W WO2008110191A1 WO 2008110191 A1 WO2008110191 A1 WO 2008110191A1 EP 2007009957 W EP2007009957 W EP 2007009957W WO 2008110191 A1 WO2008110191 A1 WO 2008110191A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
reactor
pulp suspension
loading
carbon dioxide
Prior art date
Application number
PCT/EP2007/009957
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Reinhard Gather
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2008110191A1 publication Critical patent/WO2008110191A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

Definitions

  • the invention relates to a process for the preparation of pulp for the production of paper, cardboard, or another fibrous web, in which the fibers provided in the form of a suspension are loaded with a precipitated product and then ground.
  • the loading of fibers with a precipitation product is i.a. in US-A-5223090.
  • a precipitation product for example a filler
  • at least one additive in particular a filler such as calcium carbonate, is deposited on the wetted fiber surface of the fiber material.
  • the wet fiber calcium oxide or calcium hydroxide is added so that at least a part of which associates with the water present in the pulp.
  • the fiber material treated in this way is then treated with carbon dioxide.
  • the mechanical properties (strength properties) of the fibers and thus also of the fibrous web are influenced by the degree of grinding of the pulp suspension.
  • This degree of grinding is a measure of how easily the pulp suspension can be dewatered.
  • a certain degree of grinding can be achieved by more or less strong grinding of the fibers in grinding machines, so-called refiners.
  • the fibers are shortened, fibrillated and squeezed. This process flexibilizes the fibers and increases their specific surface area, thus also increasing the number of possible bond points between the fibers during sheet formation.
  • the object of the invention is therefore to obtain the greatest possible degree of loading of the fibers by simple means and to reduce the pH of the pulp suspension after grinding.
  • this object is achieved in that the pulp suspension is fed after grinding carbon dioxide or carbon dioxide. It was recognized that it is the common milling of pulp and
  • the pulp suspension during the addition should be in a reactor, in particular a mixer with stirrer or a static mixer.
  • the ph value of the pulp suspension measured after the reactor can be used as a measure of the extent of the chemical reaction in the reactor. Therefore, the amount of carbon dioxide or carbon dioxide supplied should be adjusted depending on the pH of the pulp suspension after this addition, in particular regulated. The more carbon dioxide or carbon dioxide is supplied, the more the ph value also decreases.
  • the amount of carbon dioxide or carbon dioxide fed in should be adjusted, in particular regulated, so that the pH after this addition is between 6.5 and 9.
  • a fibrous web made with loaded fibers is easier to dewater, saving energy and allowing machine speeds to be achieved.
  • the black sateen can be at least substantially reduced.
  • Core of the loading process is to specifically store lime milk and / or filler in the fiber interior, which increases the filler content, the strength, the porosity and the volume and improves opacity and printability.
  • calcium carbonate calcium oxide or calcium hydroxide is preferably introduced in liquid or dry form into an aqueous wetted pulp and the pulp is mixed with gaseous carbon dioxide in a loading reactor.
  • the fibers When loading the fibers, it may increase the efficiency if at least a portion of the calcium oxide or calcium hydroxide is added directly to the loading reactor. Both the carbon dioxide and the calcium oxide or the Calcium hydroxide in this case encounter already formed calcium carbonate, so that it comes to a further crystallization.
  • the formation of calcium carbonate may also be assisted by the thickening of the pulp suspension prior to the loading reactor.
  • the process is also conducive to feeding the preferably thickened pulp in the loading reactor with a calcium hydroxide-containing liquid, preferably milk of lime.
  • the loading reactor should preferably have a pressure between 1 and 6 bar, preferably between 1 and 4 bar.
  • the pulp suspension should be introduced at a consistency of between 0.1 and 40%, preferably between 0.5 and 30% in the loading reactor.
  • the average residence time of the pulp suspension in the loading reactor is between 1 and 15 minutes, preferably between 5 and 10 minutes.
  • the temperature in the loading reactor should advantageously be between 15 and 130 ° C., preferably between 20 and 60 ° C.
  • the loaded pulp should contain a maximum of 50% precipitated product, especially calcium carbonate. It is also advantageous if the aqueous pulp suspension is formed from fresh pulp.
  • the loading may result in crystals of a rhombohedral or a scalenohedral shape or agglomerates of between 0.02 and 5 micrometers in length.
  • the pulp suspension which has been thickened in a press to a consistency of up to 30%, is fed to a loading reactor 2 for loading the fibers with calcium carbonate as filler, which is preferably designed as a heating screw, fluffer or crystallizer.
  • calcium oxide and / or calcium hydroxide (lime milk) is added to the fiber material so that at least a part of it becomes coextensive with that in the fiber material, i. between the fibers, in the hollow fibers and in their walls, can be associated with the following chemical reaction:
  • the loading reactor 2 is controlled via a valve 4 supplied CO 2 , wherein accumulates calcium carbonate on the wetted fiber surfaces.
  • the following chemical reaction occurs: Ca (OH) 2 + CO 2 CaCO 3 + H 2 O
  • the loading reactor 2 ambient pressure and a temperature between 20 and 60 ° C. prevail. After a residence time of between 5 and 10 minutes, the loaded pulp is fed to a grinder in the form of a refiner 1. In this grinder, the fibers are treated together with the calcium carbonate until the required degree of grinding.
  • the milled material therefore passes into a reactor 3 in the form of a mixer with stirrer or a static mixer.
  • Carbon dioxide is also supplied to this reactor 3 via a controllable valve 5. This carbon dioxide reacts with the calcium hydroxide released by the milling to form calcium carbonate.
  • a pH value between 6.5 and 9 is aimed at. Therefore, a ph value measurement 6 is carried out after the reactor 3.
  • the measured ph value is reported to a control unit 7 and evaluated there.
  • This control unit 7 then controls the amounts of CO 2 supplied to the reactors 2, 3 in accordance with the measured pH value.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une matière fibreuse pour la fabrication d'une bande de papier, de carton ou d'une autre matière fibreuse, dans lequel les fibres préparées sous la forme d'une suspension sont chargées avec un produit de précipitation et ensuite broyées. Le chargement des fibres est ainsi facilement augmenté et la valeur de pH de la suspension de matière fibreuse est diminuée du fait que du dioxyde de carbone ou du gaz carbonique est amené à la suspension de matière fibreuse après le broyage.
PCT/EP2007/009957 2007-03-12 2007-11-17 Procédé de fabrication de fibres chargées WO2008110191A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710011796 DE102007011796A1 (de) 2007-03-12 2007-03-12 Verfahren zur Aufbereitung von beladenen Fasern
DE102007011796.7 2007-03-12

Publications (1)

Publication Number Publication Date
WO2008110191A1 true WO2008110191A1 (fr) 2008-09-18

Family

ID=39371012

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/009957 WO2008110191A1 (fr) 2007-03-12 2007-11-17 Procédé de fabrication de fibres chargées

Country Status (2)

Country Link
DE (1) DE102007011796A1 (fr)
WO (1) WO2008110191A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016116650A1 (de) 2016-09-06 2018-03-08 Papiertechnische Stiftung Compound mit einer Trockenmasse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223090A (en) * 1991-03-06 1993-06-29 The United States Of America As Represented By The Secretary Of Agriculture Method for fiber loading a chemical compound
EP1172478A1 (fr) * 2000-07-13 2002-01-16 Voith Paper Patent GmbH Procédé pour le chargement de fibres avec carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
DE10317722A1 (de) * 2003-04-17 2004-11-11 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension mit Kalziumkarbonat und Anordnung zur Durchführung des Verfahrens
WO2005121448A1 (fr) * 2004-06-09 2005-12-22 Voith Patent Gmbh Procede et dispositif pour preparer une suspension de matiere fibreuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223090A (en) * 1991-03-06 1993-06-29 The United States Of America As Represented By The Secretary Of Agriculture Method for fiber loading a chemical compound
EP1172478A1 (fr) * 2000-07-13 2002-01-16 Voith Paper Patent GmbH Procédé pour le chargement de fibres avec carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
DE10317722A1 (de) * 2003-04-17 2004-11-11 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension mit Kalziumkarbonat und Anordnung zur Durchführung des Verfahrens
WO2005121448A1 (fr) * 2004-06-09 2005-12-22 Voith Patent Gmbh Procede et dispositif pour preparer une suspension de matiere fibreuse

Also Published As

Publication number Publication date
DE102007011796A1 (de) 2008-09-18

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