EP1921205A1 - Verfahren zur Entfernung von störenden Fasern, Faserbruchstücken oder Gefäßzellen aus einer wässrigen Faserstoffsuspension - Google Patents

Verfahren zur Entfernung von störenden Fasern, Faserbruchstücken oder Gefäßzellen aus einer wässrigen Faserstoffsuspension Download PDF

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Publication number
EP1921205A1
EP1921205A1 EP07016237A EP07016237A EP1921205A1 EP 1921205 A1 EP1921205 A1 EP 1921205A1 EP 07016237 A EP07016237 A EP 07016237A EP 07016237 A EP07016237 A EP 07016237A EP 1921205 A1 EP1921205 A1 EP 1921205A1
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EP
European Patent Office
Prior art keywords
stage
fraction
hydrocyclones
light fraction
fibers
Prior art date
Legal status (The legal status 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 status listed.)
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Application number
EP07016237A
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German (de)
English (en)
French (fr)
Inventor
Michael Kramer
Harald Selder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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 EP1921205A1 publication Critical patent/EP1921205A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method for removing interfering fibers, fiber fragments or vessel cells from an aqueous pulp suspension according to the preamble of claim 1.
  • Methods of the type mentioned can e.g. be used to separate from a pulp suspension intended for paper production at least a portion of the unwanted fibers or fiber fragments suspended therein.
  • a typical application of such a method is the treatment of an obtained from possibly printed waste paper aqueous pulp suspension.
  • waste paper it must be expected that some of the fibers or fiber fragments contained therein have only a low ability to form hydrogen bonds, which are indispensable for paper strength, however.
  • Such substances are therefore also referred to as inactive fibers, and they do more harm than good, at least in this form.
  • the pulp suspension is used to produce higher value papers, e.g. graphic papers
  • such inactive fibers can degrade the printability of the paper. This can e.g. due to the fact that such substances detach during printing.
  • vascular cells English: vessels
  • Their proportion of pulp is eg 3 to 5%.
  • vascular cells may have a hydrophobic character, or at least be significantly less hydrophilic.
  • the invention is therefore based on the object to provide a method with which it is possible to reduce or eliminate the disadvantages resulting from the content of interfering fibers or fiber fragments or vascular cells. At the same time, the strength potential of the fibers intended for paper production should be spared as far as possible.
  • a significant advantage of the method is that the material milling required to achieve the required paper quality can be substantially reduced. Without applying this method, full flow milling of the pulp suspension is common, e.g. in order to increase the binding capacity of the fibers and / or to improve the formation of a particularly important quality in high-grade papers. It is to be expected that the Vollstrommahlung is much less economical than if - as provided in the inventive method - a separation of the inactive fibers and fiber components is carried out and these are ground specifically. In addition to the saved grinding energy (energy costs make up a considerable share of the costs for stock preparation), it also means in many cases that the specific volume of the paper produced is greater as a result of the overall lower milling of the substance.
  • the method may also be used to advantage when both inactive fibers / fiber fragments and vascular cells are present in the pulp suspension.
  • fiber fragments and vascular cells in particular their property can be used that they behave differently than active fibers due to the lower specific surface area during fractionation processes. This is particularly true of vascular cells because they are larger and have no fibrils like the active fibers. It is therefore possible to adjust the separation limit so that active fibers in the light fraction and inactive fibers and vascular cells in the heavy fraction are enriched and thus reach the subsequent stages. In this way, an enrichment of these impurities takes place from stage to stage. Then at the last Stage a separation into heavy parts on the one hand and fibrous components with active fibers on the other hand done.
  • the pulp suspension is contaminated with the usual heavy particles such as sand, metal pieces, these can also be removed when carrying out the process, since these are enriched from stage to stage.
  • the contaminant fraction is also relatively free of heavy substances, such as e.g. Sand, metal and glass parts, detached ink particles.
  • a typical plant to solve the given separation task is a multi-stage cleaner system, as it is used in many cases anyway in the constant part before a paper machine.
  • Cleaners are highly effective hydrocyclones, often with a volume flow rate of not more than 200 l / min, preferably less than 100 l / min. They are well-suited for this purpose because they can classify the particles not only by their density but also by their surface area, especially with a shrinkage consistency below 1%, especially below 0.6%.
  • they are operated in multiple stages so that the heavy fraction of an upstream stage is fed into the feed of the downstream stage, wherein the heavy fraction of the last stage is to be regarded as the reject of the cleaner plant, which is usually discarded.
  • the light fraction of the first stage is usually the accepts of the cleaner plant, while the light fraction of the other stages upstream, preferably in the inlet of the directly preceding stage, is initiated.
  • the interfering fiber fragments and vascular cells reach enriched in their heavy fraction at the front stages.
  • the lightweight material preferably the last hydrocyclone stage, is not returned to the preceding stage, but led out of the cleaner unit as a special contaminant fraction.
  • the requirements for this separation stage may be lower, as here heavy parts are separated from the other much lighter materials. This can be taken into account by the fact that the cleaners are larger (more volume throughput) or operated with a higher consistency.
  • Fig. 1 shows schematically a typical example of how to carry out the method according to the invention.
  • the pulp suspension S is first supplied to a first stage 1, in which a fractionation by means of centrifugal forces takes place. Suitable devices will be discussed later.
  • a light fraction A1 and a heavy fraction R1 are formed in the first stage 1.
  • the heavy fraction R1 passes into the second stage 2, in turn, a division into light fraction, here A2, and heavy fraction, here R2, is performed.
  • the light fraction A2 enters the inlet of the upstream stage 1, while the heavy fraction R2 forms the inlet for the third stage 3.
  • the heavy fraction R3 of the third stage 3 is rejected here as a reject, while the light fraction A3 of this stage is led out as Störstofffr forcing S1 from the fractionation.
  • the contaminant fraction S1 in which, as already mentioned, inactive fiber fragments, inactive fibers and / or vascular cells (vessels) are enriched, can be specifically prepared.
  • a grinding device 5 is used, which is indicated schematically as a double-disc refiner.
  • the surfaces of the inactive fibers or fiber fragments it is advantageously possible for the surfaces of the inactive fibers or fiber fragments to be activated. It is also possible to bring about an improvement of this substance by targeted fiber shortening and / or comminution of the fibers or vascular cells, so that it can likewise be used for paper production, either together with the light fraction A1 of the first stage or in another use. In other cases, a dispersion of the Störstofffr forcing S1 conceivable. Depending on the composition and requirements of paper production, it may also be useful to discard this contaminant fraction S1 or to use it for energy generation (incineration).
  • a four-stage cleaner system is shown schematically, it should be noted that usually a stage, a larger number of cleaners is combined, which are connected in parallel.
  • the plant shown here thus consists of four stages 1, 2, 3 and 4. Again, the light fraction A1 of the first stage of the purified accepts. Both the heavy fraction R1 of the first and the heavy fraction R2 of the second stage are respectively introduced into the inlet of the downstream stages 2 and 3 respectively.
  • the addition of dilution water W1 or W2 or W3 is provided in the case of the plant shown here. Such dilution water streams may be added directly to the cleaner or into the connection line to the subsequent stage.
  • the light fraction A3 of the third so the penultimate stage can also be deducted as Störstofffr syndrome.
  • the light fraction of the penultimate stage is also returned to an upstream stage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Paper (AREA)
EP07016237A 2006-11-10 2007-08-18 Verfahren zur Entfernung von störenden Fasern, Faserbruchstücken oder Gefäßzellen aus einer wässrigen Faserstoffsuspension Withdrawn EP1921205A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006052983 2006-11-10

Publications (1)

Publication Number Publication Date
EP1921205A1 true EP1921205A1 (de) 2008-05-14

Family

ID=38617277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07016237A Withdrawn EP1921205A1 (de) 2006-11-10 2007-08-18 Verfahren zur Entfernung von störenden Fasern, Faserbruchstücken oder Gefäßzellen aus einer wässrigen Faserstoffsuspension

Country Status (2)

Country Link
EP (1) EP1921205A1 (pt)
BR (1) BRPI0703624A (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010043766A1 (en) * 2008-10-13 2010-04-22 Metso Paper, Inc. Pulp processing method and system
WO2017165790A1 (en) * 2016-03-24 2017-09-28 The Procter & Gamble Company Process for producing strong and soft tissue and towel products

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292122A (en) * 1976-12-06 1981-09-29 Domtar Inc. Bonding properties of mechanical pulps
WO1999036612A1 (en) * 1998-01-20 1999-07-22 Nils Anders Lennart Wikdahl A process and apparatus for the production of cellulose pulps of improved quality
WO2006033605A1 (en) * 2004-09-21 2006-03-30 Noss Ab Process and device to manufacture cellulose pulp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292122A (en) * 1976-12-06 1981-09-29 Domtar Inc. Bonding properties of mechanical pulps
WO1999036612A1 (en) * 1998-01-20 1999-07-22 Nils Anders Lennart Wikdahl A process and apparatus for the production of cellulose pulps of improved quality
WO2006033605A1 (en) * 2004-09-21 2006-03-30 Noss Ab Process and device to manufacture cellulose pulp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010043766A1 (en) * 2008-10-13 2010-04-22 Metso Paper, Inc. Pulp processing method and system
AT509358A3 (de) * 2008-10-13 2012-12-15 Metso Paper Inc Verfahren und anordnung zur zellstoffverarbeitung
AT509358B1 (de) * 2008-10-13 2013-02-15 Metso Paper Inc Verfahren und anordnung zur zellstoffverarbeitung
WO2017165790A1 (en) * 2016-03-24 2017-09-28 The Procter & Gamble Company Process for producing strong and soft tissue and towel products
US10385508B2 (en) 2016-03-24 2019-08-20 The Procter & Gamble Company Process for producing strong and soft tissue and towel products

Also Published As

Publication number Publication date
BRPI0703624A (pt) 2008-07-01

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