WO2003021038A1 - Procede pour façonner une bande en matiere fibreuse - Google Patents

Procede pour façonner une bande en matiere fibreuse Download PDF

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Publication number
WO2003021038A1
WO2003021038A1 PCT/EP2002/008441 EP0208441W WO03021038A1 WO 2003021038 A1 WO2003021038 A1 WO 2003021038A1 EP 0208441 W EP0208441 W EP 0208441W WO 03021038 A1 WO03021038 A1 WO 03021038A1
Authority
WO
WIPO (PCT)
Prior art keywords
impurities
pulp
carried out
fed
loading process
Prior art date
Application number
PCT/EP2002/008441
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Oliver Heise
Joerg Rheims
Ronald Sigl
Original Assignee
Voith Paper 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 Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Publication of WO2003021038A1 publication Critical patent/WO2003021038A1/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
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21H17/01—Waste products, e.g. sludge
    • 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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates

Definitions

  • the invention relates to a method for forming a fibrous web, in particular paper or cardboard web, from a fibrous suspension containing impurities such as printing inks, stickies, flexo-ink and / or the like.
  • the pulp used for papermaking which can consist in particular of recovered pulp, is known to be used in various processes during the production process, e.g. fed to a flotation and dispersion in order to eliminate or crush undesired constituents, such as printing inks and stickies, so that these are no longer perceptible optically and correspondingly better optical values are achieved. In fact, removing the inks and stickies, especially the small fractions, is practically impossible.
  • fillers or fillers such as calcium carbonate (CaCOs) in particular to the end product paper can achieve higher optical values.
  • Loading with an additive can be carried out, for example, by a chemical precipitation reaction, ie in particular by a so-called "Fiber Loading TM” process, as described, inter alia, in US Pat. No. 5,223,090.
  • a chemical precipitation reaction ie in particular by a so-called "Fiber Loading TM” process
  • at least one additive, in particular filler is embedded on the wetted fiber surfaces of the fiber material.
  • the fibers can be loaded with calcium carbonate, for example.
  • calcium oxide is added to the moist, disintegrated fiber material and / or calcium hydroxide is added so that at least a part thereof is associated with the water present in the fiber material.
  • the fiber material treated in this way is then subjected to carbon dioxide.
  • the calcium hydroxide medium When the calcium oxide and / or the calcium hydroxide medium is added to the fiber suspension, a chemical reaction with an exothermic property takes place, the calcium hydroxide preferably being added in liquid form (milk of lime). This means that the water which is possibly stored in or on the fibers of the fiber suspension is not absolutely necessary for the start and the course of the chemical reaction.
  • the aim of the invention is to provide a method of the type mentioned at the outset, with which it is ensured in the simplest and most reliable manner that undesired constituents, such as in particular printing inks and stickies in the finished material or finished product, are no longer perceptible optically and correspondingly better optical values are achieved become.
  • This object is achieved according to the invention by a method for forming a fibrous web, in particular paper or cardboard web, from a fibrous suspension containing impurities such as printing inks, stickies, flexo ink and / or the like, in which the impurities contained in the fibrous suspension at least partially masked thereby that they are loaded or coated with an auxiliary by a chemical separation reaction.
  • the contaminants in question are thus masked or encased by means of the so-called “Fiber-Loading TM " process, the contaminants remaining in the pulp, ie in particular printing ink and sticky particles, being used as reaction nuclei.
  • the precipitation product in question crystallizes on the printing ink or sticky and envelops the impurities in question. In this masking process it does not matter whether the respective contamination particle is found in the lumen, on the fiber surface or as a so-called free contamination between the fibers.
  • it contains the impurities Fiber suspension is fed to a reactor and the chemical precipitation reaction is triggered in this reactor.
  • the fiber suspension containing the contaminants can in particular be fed to a fluffer or pump disperser and this fluffer can simultaneously be used as a reactor for the precipitation reaction.
  • Precipitated calcium carbonate is preferably used as an auxiliary. In principle, however, any other precipitation products are conceivable.
  • calcium oxide and / or calcium hydroxide in particular calcium oxide and / or calcium hydroxide, can be added to the fiber suspension containing the impurities and carbon dioxide can be introduced into the fiber suspension treated in this way in order to trigger a precipitation reaction in which the starting materials mentioned calcium oxide or calcium hydroxide and carbon dioxide into the reaction products Calcium carbonate and water are implemented.
  • CaCOs calcium carbonate
  • CaO calcium oxide
  • Ca (OH) 2 calcium hydroxide
  • the fiber material treated in this way can then be exposed to carbon dioxide (CO2).
  • dry fiber surfaces can include all wetted surfaces of the individual fibers, including the contaminants. This also includes in particular the case in which the fibers both on their outer surface and in their interior (lumen) as well in between be loaded with calcium carbonate or any other precipitation product.
  • the fibers or impurities e.g. are loaded with the filler calcium carbonate, the attachment to the wetted surfaces being carried out by a so-called “Fiber Loading TM” process, as is described as such in US Pat. No. 5,223,090.
  • this "Fiber Loading TM” process e.g. the carbon dioxide with the calcium hydroxide to water and calcium carbonate.
  • the fiber suspension containing the impurities and mixed with calcium oxide and / or calcium hydroxide can be mixed in a mixing tank before being fed to a reactor in which the precipitation reaction is initiated by introducing carbon dioxide.
  • the fiber suspensions and the calcium oxide or calcium hydroxide can be fed to the mixing container.
  • the pulp suspension can be produced in particular by dissolving pulp or waste paper with additives in a pulping agent or can be fed to the loading process as undried pulp, e.g. from another pulp factory or DIP plant.
  • the loading process is carried out in such a way that, compared to the starting pulp, there is a brightness which is about 0.5 to about 30 points and preferably about 2 to about 8 points higher, an increase of 4 points in particular corresponds to twice the brightness.
  • the loading process can in particular also be carried out in such a way that, compared to the starting pulp, there is a reflectivity (opacity) which is approximately 0.5 to approximately 30 points and preferably approximately 2 to approximately 8 points higher, an increase of in particular 4 points one corresponds to double reflectivity.
  • the loading process is carried out in such a way that, compared to the starting pulp, there are approximately 1 to approximately 30% and preferably approximately 5 to approximately 25% less detectable dirt spots.
  • a corresponding detection method is the Tappi test method T 277 pm-99.
  • the loading process can also be carried out, for example, in such a way that, in relation to the starting pulp, a stickies absorption results with respect to scalenoid crystals, which for the range> 100 ⁇ m, in particular> 300 ⁇ m, expediently> 600 ⁇ m and preferably > 5000 ⁇ m is about 1 to about 60% and preferably about 5 to about 45% higher.
  • the loading process is carried out in such a way that, with respect to rhomboid crystals (rhombohedral crystals), there is sticky absorption in comparison with the starting pulp, which for the range> 100 ⁇ m, in particular> 300 ⁇ m, expediently> 600 ⁇ m m and preferably> 5000 ⁇ m is about 1 to about 60% and preferably about 5 to about 45% higher.
  • the invention is explained in more detail below using an exemplary embodiment with reference to the drawing.
  • the single figure of the drawing shows a simplified process diagram for an exemplary pretreatment of a fiber suspension, in particular for the manufacture of paper and / or cardboard, which contains impurities such as printing inks, stickies, flexo ink and / or the like, in which the impurities contained in the fiber suspension at least partially masked by loading them with calcium carbonate (CaCOs) through a chemical precipitation reaction.
  • CaCOs calcium carbonate
  • the pulp suspension is produced, for example, by dissolving pulp or waste paper with additives in a pulp 10 and / or from undried pulp, which is also referred to as "never dried pulp", fed to the loading process, e.g. Coming directly from a connected pulp mill or DIP system.
  • the pulp suspension can e.g. can be thickened in area 12 by dewatering by means of a press, since a higher fiber mass concentration is advantageous for the "Fiber Loading TM" process.
  • the impurities such as in particular printing inks, stickies, flexo-ink and / or the like fiber suspensions are added in a mixing container 14 calcium hydroxide and optionally calcium oxide, in which the mixture in question is then mixed.
  • 16 carbon dioxide or a medium containing carbon dioxide is introduced into the fiber-containing suspension of impurities in a reactor in order for to ensure a conversion of the starting materials calcium hydroxide or calcium oxide into the reaction products calcium carbonate and water in order to mask or envelop the impurities.
  • Calcium oxide and / or calcium hydroxide (slaked lime) is thus added to the fiber material in such a way that at least part of this fiber material or the impurities in question coincide with that in the fiber material, i.e. water associated between the fibers, in the hollow fibers and in their walls, whereby the following chemical reaction occurs:
  • the fiber material is then exposed to carbon dioxide (CO2) or a medium containing carbon dioxide in such a way that calcium carbonate (CaCOs) is largely deposited on the wetted surfaces.
  • CO2 carbon dioxide
  • CaCOs calcium carbonate
  • the optical initial values of the starting raw material are improved in that the impurities, ie in particular the printing ink and sticky particles remaining in the fiber suspension, are masked or enveloped by means of a "Fiber Loading TM" process.
  • the printing ink and stickyparticles in question are used as reaction nuclei, which means that the calcium carbonate crystallizes on the printing ink or sticky, thereby enveloping these impurities.
  • This process can be called a masking process. It does not matter whether the respective contamination particle is found in the lumen, on the fiber surface or as a so-called free contamination between the fibers.

Abstract

L'invention concerne un procédé pour façonner une bande en matière fibreuse, notamment une bande en papier ou en carton, à partir d'une suspension de matière fibreuse contenant des impuretés telles que des encres d'imprimerie, des matières collantes, de l'encre flexographique et/ou des substances analogues. Selon le procédé, les impuretés contenues dans la suspension de matière fibreuse sont au moins partiellement masquées par une réaction de précipitation chimique qui les charge ou les entoure d'un auxiliaire.
PCT/EP2002/008441 2001-08-29 2002-07-30 Procede pour façonner une bande en matiere fibreuse WO2003021038A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142200.8 2001-08-29
DE2001142200 DE10142200A1 (de) 2001-08-29 2001-08-29 Verfahren zur Bildung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
WO2003021038A1 true WO2003021038A1 (fr) 2003-03-13

Family

ID=7696912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/008441 WO2003021038A1 (fr) 2001-08-29 2002-07-30 Procede pour façonner une bande en matiere fibreuse

Country Status (2)

Country Link
DE (1) DE10142200A1 (fr)
WO (1) WO2003021038A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076578A (en) * 1974-10-21 1978-02-28 Canadian Patents And Development Limited Ink removal from waste paper
US5227020A (en) * 1989-03-23 1993-07-13 Henkel Kommanditgesellschaft Auf Aktien Process for regenerating wastepaper using a double layer hydroxide formed in situ
EP0604095A1 (fr) * 1992-12-23 1994-06-29 Ecc International Limited Procédé de traitement de suspensions de déchets
US5549787A (en) * 1995-02-03 1996-08-27 Sain; Mohini M. Treatment of waste printed papers with surface active polymeric compositions to produce brighter pulp
EP0737774A1 (fr) * 1995-04-13 1996-10-16 Ecc International Limited Prodédé pour le traitement de déchets d'une installation de désencrage de vieux papier
DE19718661A1 (de) * 1997-05-02 1998-11-05 Basf Ag Verfahren zum Deinking von Altpapier
EP1046744A1 (fr) * 1999-03-22 2000-10-25 Kalkfabrik Netstal AG Procédé pour séparer de l'encre de vieux papier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715832A1 (de) * 1997-04-16 1998-10-22 Basf Ag Verfahren zur Herstellung von Papier, Pappe und Karton
DE19719059A1 (de) * 1997-05-06 1998-11-12 Basf Ag Verfahren zur Herstellung von Papier, Pappe und Karton

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076578A (en) * 1974-10-21 1978-02-28 Canadian Patents And Development Limited Ink removal from waste paper
US5227020A (en) * 1989-03-23 1993-07-13 Henkel Kommanditgesellschaft Auf Aktien Process for regenerating wastepaper using a double layer hydroxide formed in situ
EP0604095A1 (fr) * 1992-12-23 1994-06-29 Ecc International Limited Procédé de traitement de suspensions de déchets
US5549787A (en) * 1995-02-03 1996-08-27 Sain; Mohini M. Treatment of waste printed papers with surface active polymeric compositions to produce brighter pulp
EP0737774A1 (fr) * 1995-04-13 1996-10-16 Ecc International Limited Prodédé pour le traitement de déchets d'une installation de désencrage de vieux papier
DE19718661A1 (de) * 1997-05-02 1998-11-05 Basf Ag Verfahren zum Deinking von Altpapier
EP1046744A1 (fr) * 1999-03-22 2000-10-25 Kalkfabrik Netstal AG Procédé pour séparer de l'encre de vieux papier

Also Published As

Publication number Publication date
DE10142200A1 (de) 2003-03-20

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