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WO2009015701A1 - Procédé de production de fines à partir de rebuts de matière fibreuse - Google Patents

Procédé de production de fines à partir de rebuts de matière fibreuse Download PDF

Info

Publication number
WO2009015701A1
WO2009015701A1 PCT/EP2008/002455 EP2008002455W WO2009015701A1 WO 2009015701 A1 WO2009015701 A1 WO 2009015701A1 EP 2008002455 W EP2008002455 W EP 2008002455W WO 2009015701 A1 WO2009015701 A1 WO 2009015701A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
fibrous material
rejects
reject
fines
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.)
Ceased
Application number
PCT/EP2008/002455
Other languages
German (de)
English (en)
Inventor
Esa-Matti Aalto
Hans-Ludwig Schubert
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 WO2009015701A1 publication Critical patent/WO2009015701A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • 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
    • D21D5/02—Straining or screening the pulp

Definitions

  • the invention relates to the production of fines from pulp reject.
  • the proportion of pulp rejects is between 5% by weight and 50% by weight.
  • the pulp rejects are detected and fed to a second refiner to achieve defibration of the reject.
  • This second grinding takes place at high consistency and with a specific grinding energy of up to 1,000 kWh / t.
  • the pulp rejects must be ground at high consistency. Grinding at low consistency would be gentler and would result in higher fiber quality.
  • low consistency milling requires many times the amount of specific grinding energy required so that the second refining at low consistency is uneconomical.
  • lignocellulosic raw material usually wood or annual crops.
  • the aim is to extract as much lignin from the fiber composite as possible in order to obtain single fibers.
  • a mechanical defibration after the chemical decomposition is no longer necessary.
  • Semi-chemical process for the production of fibrous materials from lignocellulosic raw materials include in their intensity of action on wood or annual plants on the aforementioned mechanical processes with pretreatment of the raw material. There is a certain loss of yield accepted in order to obtain a better quality of the pulp.
  • the pulp must be mechanically shredded after digestion.
  • the fragment content or the proportion of pulp reject is much lower than with mechanical methods. On a preparation of the reject is omitted.
  • the fractions with long fibers contribute significantly to the good strength properties. Fines, however, are an important component for papermaking, in particular to adjust opacity and printability. It is therefore desirable that the pulp composition may optionally be enriched by fines. With the known methods, a targeted adjustment of the pulp fractions is not possible or only with the use of considerable specific grinding energy.
  • Sulfite pulping were not already decomposed in a first grinding in further processable fibers.
  • the fibers thus produced are to be fibrillated after digestion with low specific energy. Even rejects which have not yet been broken down into reusable fibers after the first refining can, according to the invention, be fibrillated with low specific refining energy and thus in a particularly economical manner.
  • fines can be produced in an economical manner by means of this second refining.
  • this second grinding is preferably carried out under atmospheric pressure
  • the fiberization of the reject pulp takes place with less than 300 kWh / t of specific grinding energy, preferably with less than 150 kWh / t of specific grinding energy, more preferably with less than 50 kWh / t of specific grinding energy.
  • the process of the present invention allows, precisely because of the low refining energy to be employed, refining of the reject in both high consistency and low consistency.
  • High-consistency fiberization (over 15%, eg 30%) requires little grinding energy
  • low-consistency fiberization (up to 5%, eg 1 - 3%) requires more specific grinding energy, but allows for better Control of the process the production of better quality fibers.
  • At least 10% by weight of the pulp reject is fiberized to fine material, preferably at least 60% by weight, more preferably at least 80%, advantageously at least 90% of the pulp reject being fibrillated to fines.
  • the second refining thus reduces the amount of rejects particularly effectively. Due to the low use of specific grinding energy, the high conversion of reject into fines has a special added value.
  • the use of the fibrous material or fine material produced according to the invention can be In the simplest case, sorting is carried out separately from the pulp already produced in the first grinding. However, it is preferred to feed the shredded pulp rejects to the sorting of the pulp after the first grinding of the first sorting of the pulp. In this way no second sorting is needed and the composition of the fiber fractions can be easily controlled.
  • a pulp blend is prepared containing pulp containing up to 50% by weight of fines and pulp having larger dimensions than fines, the pulp having a lignin content of unbleached softwood pulp of at least 15%. , preferably of at least 18%, more preferably of at least 21% and advantageously of at least 24% of the otro pulp, and that the lignin content of the unbleached pulp for hardwood at least 12%, in particular of at least
  • a pulp mixture is produced whose pulp has a breaking length of more than 6.5 km at 12 ° SR or a breaking length of more than 8.0 km
  • all fibers are referred to as fines that pass through a sieve with a mesh size of up to 74 ⁇ m (R 200).
  • Spruce rejects with a lignin content of more than 21% are ground with a basalt set at 30% consistency with an energy input of 150 kWh / t. 85% of the ground spruce reject pass through a sieve with a mesh size of up to 74 ⁇ m (R 200). 85% of spruce rejects are converted into fines.
  • Pine rejects with a lignin content of 18% are milled at 4% consistency (low consistency milling) with an energy input of 250 kWh / t. 81% of the reject used are converted to fines (R200 or higher) after grinding. The the reject were ground to a fine material having a freeness of 83 SR 0.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de production de fines à partir de rebuts de matière fibreuse, lequel procédé consiste à collecter les rebuts de matière fibreuse après un premier raffinage et un premier tri de la matière fibreuse puis à défibrer les rebuts de matière fibreuse. Le procédé se caractérise en ce que le défibrage des rebuts de matière fibreuse est effectué avec une énergie de raffinage spécifique inférieure à 500 kWh/t. L'invention concerne également un mélange de matières fibreuses contenant une matière fibreuse présentant jusqu'à 50 % en masse de fines et une matière fibreuse de dimensions supérieures à celle des fines, la matière fibreuse présentant une teneur en lignine, dans le cas d'une matière fibreuse de résineux non blanchie, d'au moins 15 %, de préférence d'au moins 18 %, idéalement d'au moins 21 % et avantageusement d'au moins 24 % de la matière fibreuse sèche absolue et la teneur en lignine de la matière fibreuse de feuillu non blanchie s'élevant à au moins 12 %, en particulier à au moins 14 %, de préférence à au moins 16 %, avantageusement à au moins 18 % de la matière fibreuse sèche absolue.
PCT/EP2008/002455 2007-07-31 2008-03-28 Procédé de production de fines à partir de rebuts de matière fibreuse Ceased WO2009015701A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710036379 DE102007036379A1 (de) 2007-07-31 2007-07-31 Verfahren zum Herstellen von Feinstoff aus Faserstoff-Rejekts
DE102007036379.8 2007-07-31

Publications (1)

Publication Number Publication Date
WO2009015701A1 true WO2009015701A1 (fr) 2009-02-05

Family

ID=39590419

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002455 Ceased WO2009015701A1 (fr) 2007-07-31 2008-03-28 Procédé de production de fines à partir de rebuts de matière fibreuse

Country Status (2)

Country Link
DE (1) DE102007036379A1 (fr)
WO (1) WO2009015701A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031335A1 (fr) * 1998-11-19 2000-06-02 Valmet Fibertech Ab Traitement de pate a papier thermomecanique de qualite superieure pour papier d'edition surcalandre/papier mince couche
WO2001042557A1 (fr) * 1999-12-09 2001-06-14 Upm-Kymmene Corporation Matiere premiere pour papier d'impression, procede de production associe et papier d'impression ainsi obtenu
WO2004003288A1 (fr) * 2002-07-01 2004-01-08 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Procede de fabrication d'une pate mecanique ou chimico-mecanique et appareil associe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI113552B (fi) * 1999-12-09 2004-05-14 Upm Kymmene Corp Menetelmä painopaperin valmistamiseksi

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031335A1 (fr) * 1998-11-19 2000-06-02 Valmet Fibertech Ab Traitement de pate a papier thermomecanique de qualite superieure pour papier d'edition surcalandre/papier mince couche
WO2001042557A1 (fr) * 1999-12-09 2001-06-14 Upm-Kymmene Corporation Matiere premiere pour papier d'impression, procede de production associe et papier d'impression ainsi obtenu
WO2004003288A1 (fr) * 2002-07-01 2004-01-08 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Procede de fabrication d'une pate mecanique ou chimico-mecanique et appareil associe

Also Published As

Publication number Publication date
DE102007036379A1 (de) 2009-02-05

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