WO2007107179A1 - Procede de traitement de cellulose contenant des cellules vasculaires genantes - Google Patents

Procede de traitement de cellulose contenant des cellules vasculaires genantes Download PDF

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Publication number
WO2007107179A1
WO2007107179A1 PCT/EP2006/012158 EP2006012158W WO2007107179A1 WO 2007107179 A1 WO2007107179 A1 WO 2007107179A1 EP 2006012158 W EP2006012158 W EP 2006012158W WO 2007107179 A1 WO2007107179 A1 WO 2007107179A1
Authority
WO
WIPO (PCT)
Prior art keywords
vascular cells
hydrocyclone
fillers
centrifugal forces
loading process
Prior art date
Application number
PCT/EP2006/012158
Other languages
German (de)
English (en)
Inventor
Harald Selder
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 WO2007107179A1 publication Critical patent/WO2007107179A1/fr

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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • vascular cells As is known, such pulps, for the production of which fast-growing hardwoods, in particular tropical hardwoods, are used, so-called vascular cells (English: vessels), which have relatively large dimensions as a result of the climatic conditions. Their proportion of pulp is usually 3 to 5%. These vascular cells are not removed in the pulp production and are disturbing in the paper produced from such a pulp, as they are responsible for certain disadvantages. So it can be e.g. happen that the vascular cells break out of the paper structure, whereby the surface deteriorates and the paper properties are impaired.
  • the invention is based on the object to provide a further method, with which it is possible to reduce or eliminate the disadvantages resulting from the content of vascular cells. It should have an improved overall economy, at least for special treatment processes.
  • the process is usually used in stock preparation at a paper mill. However, it can also be carried out in the pulp mill after digestion.
  • the loading of the vascular cells and fibers with mineral filler is carried out, for example, by a chemical precipitation reaction, i. in particular by a so-called "Fiber Loading TM" process, as described inter alia in US-A-5 223 090.
  • a chemical precipitation reaction i. in particular by a so-called "Fiber Loading TM” process, as described inter alia in US-A-5 223 090.
  • at least one additive is added to the wetted fiber surfaces of the fiber material Filler, stored.
  • the fibers can be loaded with calcium carbonate, for example.
  • the moist, disintegrated fiber material calcium oxide and / or calcium hydroxide is preferably added in liquid form (milk of lime) so that at least a part of it associates with the water present in the fiber material.
  • the fiber material treated in this way is then treated with carbon dioxide. This causes a chemical reaction in which the calcium carbonate precipitates and attaches to the wetted fibers and vascular cells. This attachment
  • Possible advantages of the filler particles obtained by loading a fiber suspension include, but are not limited to, the following:
  • the achieved filler level may be below or above 40%.
  • a new way of incorporation of pigments is provided to achieve the desired optical properties and printability in and on the paper sheet in papermaking.
  • the filler particles are incorporated in the fibers, they can be in the sieve or
  • Pulp preparation system can be crystallized, can provide economic benefits through savings of retention agents, fibers and sludge, reducing the
  • TiO 2 can be reduced after a higher whiteness and better optical properties can be achieved.
  • Vessel cells have the task of securing the transport of water in hardwood logs. As a rule, these vascular cells are lined with a lignin layer in the part through which water flows. This results in a strong hydrophobic character. Through the digestion process, this lignin layer is dissolved out leaving behind a porous and hydrophilic fiber material. Vessel cells have the property to be loaded particularly effectively due to this porosity. That is, they deposit and take up the precipitated fillers more than the pulp fibers. This increases their density and they can be effectively separated from the pulp fibers by centrifugal forces.
  • the combination according to the invention of the loading and hydrocycloning process steps ensures that the loss of quality threatening by the vascular cells mentioned above no longer occurs for the paper produced later from the pulp, since the vast majority of the vascular cells can be removed.
  • the loading brings a significant quality improvement.
  • a pulp suspension 1 which is mixed with interfering vascular cells, fed to a loading process 2.
  • a loading process 2 This is known per se.
  • calcium hydroxide 3 lime milk
  • gaseous carbon dioxide 4 are successively added and reacted. Measures for setting optimum reaction conditions are not shown here, since it is well known, for example from DE 102 04 254-A1, 100 33 979-A1 or EP 1 409 789.
  • the loaded suspension 7 is brought by a pump 8 to an elevated pressure and pumped into a system with parallel connected hydrocyclones 9.
  • Such hydrocyclones also called cleaners, exhibit a considerable release effect at a consistency (dry content) of less than 3%.
  • the loaded vascular cells can therefore be removed as heavy dirt in the reject flow 11.
  • Particularly effective are continuously operated hydrocyclones with a relatively large reject flow 11, for example 5 to 20% by volume of the feed stream to the hydrocyclone.
  • a secondary stage (not shown here) is usually operated for this.
  • the Gustoffstrom 10 of the hydrocyclones 9 is sufficiently free of interfering vascular cells.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de traitement d'une suspension de cellulose (1) comprenant une partie gênante de cellules vasculaires. Ces cellules sont traitées par un procédé de chargement (2), selon lequel une matière de remplissage se forme par une réaction chimique, ladite matière de remplissage absorbant les cellules vasculaires. Ces cellules peuvent également être éliminées par force centrifuge, par exemple dans un hydrocyclone (9).
PCT/EP2006/012158 2006-03-21 2006-12-16 Procede de traitement de cellulose contenant des cellules vasculaires genantes WO2007107179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610012835 DE102006012835B3 (de) 2006-03-21 2006-03-21 Verfahren zur Behandlung von störende Gefäßzellen enthaltendem Zellstoff
DE102006012835.4 2006-03-21

Publications (1)

Publication Number Publication Date
WO2007107179A1 true WO2007107179A1 (fr) 2007-09-27

Family

ID=37898815

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/012158 WO2007107179A1 (fr) 2006-03-21 2006-12-16 Procede de traitement de cellulose contenant des cellules vasculaires genantes

Country Status (2)

Country Link
DE (1) DE102006012835B3 (fr)
WO (1) WO2007107179A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017165790A1 (fr) * 2016-03-24 2017-09-28 The Procter & Gamble Company Procédé de production de produits serviettes et mouchoirs solides et doux

Citations (6)

* 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
DE19816621A1 (de) * 1998-04-15 1999-11-04 Voith Sulzer Papiertech Patent Verfahren zur Mahlung von Laubholz-Zellstoff
DE10033979A1 (de) * 2000-07-13 2002-01-24 Voith Paper Patent Gmbh Verfahren zum Beladen von Fasern mit Calciumcarbonat
WO2003006740A1 (fr) * 2001-07-11 2003-01-23 Voith Paper Patent Gmbh Procede d'impregnation d'une suspension de fibres avec du carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
DE10337821B3 (de) * 2003-08-18 2005-01-13 Voith Paper Patent Gmbh Verfahren zur Behandlung von störende Gefäßzellen enthaltendem Zellstoff

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510020A (en) * 1980-06-12 1985-04-09 Pulp And Paper Research Institute Of Canada Lumen-loaded paper pulp, its production and use
US5770012A (en) * 1994-11-18 1998-06-23 P. H. Glatfelter Co. Process for treating paper machine stock containing bleached hardwood pulp with an enzyme mixture to reduce vessel element picking
DE10347920A1 (de) * 2003-10-15 2005-05-19 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beladen einer Faserstoffsuspension

Patent Citations (6)

* 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
DE19816621A1 (de) * 1998-04-15 1999-11-04 Voith Sulzer Papiertech Patent Verfahren zur Mahlung von Laubholz-Zellstoff
DE10033979A1 (de) * 2000-07-13 2002-01-24 Voith Paper Patent Gmbh Verfahren zum Beladen von Fasern mit Calciumcarbonat
WO2003006740A1 (fr) * 2001-07-11 2003-01-23 Voith Paper Patent Gmbh Procede d'impregnation d'une suspension de fibres avec du carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
DE10337821B3 (de) * 2003-08-18 2005-01-13 Voith Paper Patent Gmbh Verfahren zur Behandlung von störende Gefäßzellen enthaltendem Zellstoff

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017165790A1 (fr) * 2016-03-24 2017-09-28 The Procter & Gamble Company Procédé de production de produits serviettes et mouchoirs solides et doux
US10385508B2 (en) 2016-03-24 2019-08-20 The Procter & Gamble Company Process for producing strong and soft tissue and towel products
US11047090B2 (en) 2016-03-24 2021-06-29 The Procter & Gamble Company Process for producing strong and soft tissue and towel products
US11834787B2 (en) 2016-03-24 2023-12-05 The Procter & Gamble Company Process for producing strong and soft tissue and towel products

Also Published As

Publication number Publication date
DE102006012835B3 (de) 2007-11-15

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