EP0504130A2 - Procédé pour la fabrication de produits en fibres ligno-cellulosiques - Google Patents

Procédé pour la fabrication de produits en fibres ligno-cellulosiques Download PDF

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Publication number
EP0504130A2
EP0504130A2 EP92890049A EP92890049A EP0504130A2 EP 0504130 A2 EP0504130 A2 EP 0504130A2 EP 92890049 A EP92890049 A EP 92890049A EP 92890049 A EP92890049 A EP 92890049A EP 0504130 A2 EP0504130 A2 EP 0504130A2
Authority
EP
European Patent Office
Prior art keywords
water
glue
lignocellulosic
excess water
lignocellulosic material
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.)
Granted
Application number
EP92890049A
Other languages
German (de)
English (en)
Other versions
EP0504130B1 (fr
EP0504130A3 (en
Inventor
Heinrich Münster
Daniel Siemons
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.)
ANDRITZ SPROUT-BAUER GmbH
Original Assignee
ANDRITZ SPROUT-BAUER 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
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Application filed by ANDRITZ SPROUT-BAUER GmbH filed Critical ANDRITZ SPROUT-BAUER GmbH
Publication of EP0504130A2 publication Critical patent/EP0504130A2/fr
Publication of EP0504130A3 publication Critical patent/EP0504130A3/de
Application granted granted Critical
Publication of EP0504130B1 publication Critical patent/EP0504130B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard

Definitions

  • the invention relates to a process for the production of products from lignocellulosic fibers, for example fiberboard, according to which pre-shredded, lignocellulosic material such as wood chips or the like is boiled under pressure after the excess water has been squeezed out, and is then ground to fibers which, after adding water-treated water Glue dried and then fed to further processing, for example plate presses.
  • the excess water from the treatment of the lignocellulosic material is either supplied to receiving water or - in newer plants - disposed of by (biological) sewage plants or by evaporation plants, whereas the glue is entirely made with fresh water. This is disadvantageous in terms of environmental pollution and the high disposal and fresh water costs in ecological, technical and economic terms.
  • the aim of the invention is to perfect the method mentioned at the outset while avoiding the disadvantages indicated.
  • This goal is achieved according to the invention in that the excess water squeezed out of the lignocellulosic material - optionally mixed with fresh water - is fed to the glue preparation.
  • the measure according to the invention reduces the amount of wastewater to a minimum, which results in all the following advantages such as reduced environmental pollution, low disposal costs and low fresh water requirements.
  • the pH value of the glue is adjusted once and for all to that of the lignocellulosic material by chemicals (for example ammonia) in such a way that the glue requirement is as low as possible. Random pH value fluctuations of the material during production can therefore occur are not taken into account, which is why the amount of glue is rarely optimally adapted to the amount of fiber.
  • the throughput is 10 tons of absolutely dry wood per hour.
  • the moisture of the wood is 50%.
  • the total throughput mass is therefore 20,000 kg / h.
  • excess water is pressed out on the one hand by means of a stuffing screw, and on the other hand the residual wood is put under pressure for subsequent cooking and defibration. After the stuffing screw, the moisture of the residual wood is 47%.
  • the 10 tons of dry wood now accounts for 53% of the total throughput mass, which results in a total throughput mass of 18,868 kg / h after the stuffing screw: 1132kg / h water are therefore squeezed out.
  • 300 kg / h of rinse water are added. This results in a total excess water volume of 1432 kg / h, which would have to be removed or disposed of according to the current state of the art.
  • the glue requirement is 10% solid resin based on the 10 ton / h dry wood throughput.
  • 10% water based on the throughput of 10 tons / h is required for the glue preparation, i.e. 1000 kg / h. If excess water is used for the glue preparation - in extreme cases without fresh water admixture - only 432 kg / h of waste water has to be disposed of instead of 1432 kg / h. However, this minimum value increases to the extent that fresh water is also used for the glue preparation.
  • the pH of the entire excess water is continuously adjusted to the pH of the lignocellulosic fibers by means of a pH control. If there is less excess water than is needed for the glue preparation, fresh water must be added, whereby the pH value control also includes the setting of the mixing ratio. The same applies analogously if it is desired from the start to carry out the glue preparation on the basis of a mixture of waste water and fresh water. It is essential that, in contrast to the prior art, a constant pH adjustment is carried out.

Landscapes

  • Paper (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP19920890049 1991-03-08 1992-03-05 Procédé pour la fabrication de produits en fibres ligno-cellulosiques Expired - Lifetime EP0504130B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT50891A AT394741B (de) 1991-03-08 1991-03-08 Verfahren zur herstellung von produkten aus lignozellulosefasern
AT508/91 1991-03-08

Publications (3)

Publication Number Publication Date
EP0504130A2 true EP0504130A2 (fr) 1992-09-16
EP0504130A3 EP0504130A3 (en) 1993-02-03
EP0504130B1 EP0504130B1 (fr) 1995-11-29

Family

ID=3492464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920890049 Expired - Lifetime EP0504130B1 (fr) 1991-03-08 1992-03-05 Procédé pour la fabrication de produits en fibres ligno-cellulosiques

Country Status (3)

Country Link
EP (1) EP0504130B1 (fr)
AT (1) AT394741B (fr)
DE (1) DE59204458D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401069B (en) * 2003-03-10 2006-01-04 Andritz Ag Maschf Process and device for discharging wood chips from a digester and conveying the raw material to a refiner

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036882A1 (fr) * 1969-04-14 1970-12-31 Etelkozi Emile
FR2303895A1 (fr) * 1975-03-13 1976-10-08 Pelzer & Roehrl Procede pour le reglage de l'activite et de la durete de l'eau mise en oeuvre pour la production du papier
USRE29770E (en) * 1973-09-14 1978-09-19 Isorel S.A. Manufacture of fiberboard according to the wet method with closed backwater system
WO1983001637A1 (fr) * 1981-10-28 1983-05-11 Danielsson, Ove Procede de production de carton de fibres selon le procede par voie humide
WO1989003911A1 (fr) * 1987-10-27 1989-05-05 Kamyr Aktiebolag Procede pour eliminer des substances organiques contenues dans des effluents provenant de processus de fabrication de cellulose et de papier
EP0381965A2 (fr) * 1989-02-07 1990-08-16 Bison-Werke Bähre & Greten GmbH & Co. KG Procédé et dispositif pour fabriquer une matière fibreuse contenant de la ligno-cellulose pour la fabrication de plaques en fibres selon un procédé à sec

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036882A1 (fr) * 1969-04-14 1970-12-31 Etelkozi Emile
USRE29770E (en) * 1973-09-14 1978-09-19 Isorel S.A. Manufacture of fiberboard according to the wet method with closed backwater system
FR2303895A1 (fr) * 1975-03-13 1976-10-08 Pelzer & Roehrl Procede pour le reglage de l'activite et de la durete de l'eau mise en oeuvre pour la production du papier
WO1983001637A1 (fr) * 1981-10-28 1983-05-11 Danielsson, Ove Procede de production de carton de fibres selon le procede par voie humide
WO1989003911A1 (fr) * 1987-10-27 1989-05-05 Kamyr Aktiebolag Procede pour eliminer des substances organiques contenues dans des effluents provenant de processus de fabrication de cellulose et de papier
EP0381965A2 (fr) * 1989-02-07 1990-08-16 Bison-Werke Bähre & Greten GmbH & Co. KG Procédé et dispositif pour fabriquer une matière fibreuse contenant de la ligno-cellulose pour la fabrication de plaques en fibres selon un procédé à sec

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401069B (en) * 2003-03-10 2006-01-04 Andritz Ag Maschf Process and device for discharging wood chips from a digester and conveying the raw material to a refiner

Also Published As

Publication number Publication date
DE59204458D1 (de) 1996-01-11
ATA50891A (de) 1991-11-15
EP0504130B1 (fr) 1995-11-29
EP0504130A3 (en) 1993-02-03
AT394741B (de) 1992-06-10

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