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WO2001021368A1 - Procede et dispositif pour desagreger des materiaux derives du bois - Google Patents

Procede et dispositif pour desagreger des materiaux derives du bois Download PDF

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Publication number
WO2001021368A1
WO2001021368A1 PCT/EP2000/005612 EP0005612W WO0121368A1 WO 2001021368 A1 WO2001021368 A1 WO 2001021368A1 EP 0005612 W EP0005612 W EP 0005612W WO 0121368 A1 WO0121368 A1 WO 0121368A1
Authority
WO
WIPO (PCT)
Prior art keywords
stuffing
screw
screws
steam
digestion
Prior art date
Application number
PCT/EP2000/005612
Other languages
German (de)
English (en)
Inventor
Reiner Stracke
Rudolf Wilholt
Alireza Kharazipour
Kurt Nonninger
Original Assignee
Pfleiderer Ag
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 Pfleiderer Ag filed Critical Pfleiderer Ag
Priority to DE50008025T priority Critical patent/DE50008025D1/de
Priority to EP00942095A priority patent/EP1222061B1/fr
Priority to US09/959,393 priority patent/US6648251B1/en
Priority to AU56833/00A priority patent/AU5683300A/en
Priority to JP2001524775A priority patent/JP2003519581A/ja
Priority to AT00942095T priority patent/ATE277727T1/de
Publication of WO2001021368A1 publication Critical patent/WO2001021368A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material

Definitions

  • the present invention relates to a device for disintegrating wood-based materials according to the preamble of the main claim and a method for carrying it out.
  • Such a device is known (DE 198 19 988 AI).
  • a transport device designed as a screw conveyor serves to transport the pulping material through the impregnation and pre-swelling shaft, while the second screw conveyor serves to transport the already pulped material out of the pulping shaft.
  • the digestion material is not transported by screw conveyors.
  • the device has the disadvantage that, when digested under pressure, the filling shaft must be able to be closed in a pressure-tight manner by suitable measures. The discharge of the digested material must also be suitably pressure-tight.
  • the object of the present invention is to provide a device and a method which enable continuous and thus simple and economical digestion of wood-based materials. This object is achieved by a generic device and a generic method with the features of the characterizing part of the main method or device claim.
  • an arrangement of preferably at least three stuffing screws allows a passage of digestion material, the filling material sealing the stuffing screws so far that the digestion process can also be carried out under pressure.
  • Steam is preferably introduced under pressure of at least 2 bar into one of the stuffing screws, which is not the first or the last of the stuffing screw arrangement. It is preferred to work with arrangements of, for example, five or more stuffing screws, with the steam being introduced into the central part of the stuffing screws arranged one behind the other, for example with an arrangement of five stuffing screws into the third stuffing screw.
  • a pressure drop can be observed in the plug screw on the edge, which can drop to atmospheric pressure, but in the middle part the arrangement leads to the maintenance of a working pressure, which can be up to 11 bar overpressure, but at least 2 to 3 bar overpressure ,
  • a major advantage of a method which is carried out completely continuously in this way according to the invention is, in particular, that complex sealing measures on the system can be dispensed with and that continuous work is nevertheless possible. This makes it possible to work without opening and the following Sealing of system parts, so that neither energy nor pollutants can escape from the system.
  • the device can therefore be operated optimally both economically and ecologically.
  • digestion pressures of 2 to 11 bar overpressure can be maintained, preferably in the range from 2 to 8 bar and in particular in the range from 3 to 6 bar overpressure.
  • the digestion temperature at the steam introduction point is approx. 143 ° C.
  • the particles are mechanically comminuted and the chemical hydrolysis is facilitated by the friction between the particles. This speeds up the digestion of the particles so that just a few minutes of residence time in the screws are sufficient to achieve good digestion.
  • the hydrolysis can be promoted by suitable measures, such as raising or lowering the pH.
  • the digestion process from filling with the crushed chipboard fragments to the fully digested, moist wood mass is therefore carried out with several, at least three, serially connected screws.
  • These pressure-tight stuffing screws fulfill several functions: both transport and continuous Crushing and hydrolysis of the pre-swollen wood mass on the one hand by rubbing the particles against one another, and on the other hand the actual digestion process takes place through the absorption of water, steam and heat within the tubular screw system.
  • a modular design is possible, whereby several identical screws and drive systems can be used, which significantly reduces costs.
  • the feed screws and drive systems which can be controlled independently of one another, allow the feed rate to be adapted to the given process conditions, the maximum limits being given only by the dimensioning of the transport systems and the reaction speed of the digestion.
  • the screw transport within the system enables a homogenization of the wood mass and a good and continuous comminution, which is a good thing, by continuously lining up during transport Surface wetting causes.
  • the enthalpy of the steam can be fully exploited over the entire length of the pipe, since the layers that have been loosened together mechanically detach and expose underlying, undissolved layers that are then easily captured by the steam.
  • the process can be accelerated again by means of higher process pressures.
  • the exhaust gas heat can be used almost completely and is not lost in comparison to the discontinuous operation according to the prior art.
  • the heat of the moist, digested wood mass can also be used by transporting it to the dryer as quickly as possible after it has left the last stuffing screw. This minimizes heat loss and the drying effort.
  • the water, steam and heat absorption of the digestion material can be influenced very precisely, which allows a further optimization of the process parameters, in particular the use of energy and an optimal process control.
  • the arrangement of the stuffing augers can be in any order. For reasons of space, an arrangement is preferred in which the output of one stuffing screw opens approximately at a right angle into the entrance area of the following stuffing screw.
  • stuffing screws are used which make it possible to apply pressure in the material to be transported during the material transport. to build.
  • Such screws which are also referred to as stuffing screws, are, for example, single-sided screws whose outlet opening runs axially. They can have a progressive or degressive slope, which means that the distances between the coils increase or decrease per turn.
  • the digestion temperature has a significant influence on the hydrolysis of the wood-based materials.
  • the temperature is approx. 143 ° C.
  • the steam pressures used must therefore be carefully monitored. In general, pressures between 7 and 11 bar will be chosen, but preferably from 2 to 8 bar and in particular from about 3 to 6 bar overpressure.
  • the transport speed through the stuffing screws is different, it can vary depending on the number of screws used. With a larger number of screws, the throughput rate can be increased, with a smaller number it must be reduced in order to ensure the dwell time required for the digestion.
  • the digestion can generally be effected completely after a residence time of about 30 minutes, preferably 20 minutes, so that if more than three screws are used, the residence time per stuffing screw is only a few minutes. Compared to conventional discontinuous digestion processes, this means a significant reduction in the digestion time.
  • the speeds of the stuffing screws are generally in the order of magnitude of a few revolutions per minute, for example 3 to 10 rpm.
  • Water temperatures can range from 20 to 95 ° C. In combination with the wood materials, the water creates an additional seal against the overpressure used for the digestion from the outside atmosphere.
  • the wood materials to be broken down are roughly comminuted before digestion, particle sizes in the order of magnitude of approximately 3 to 10 cm, preferably 3 to 5 cm, having proven particularly expedient. Crushing under 2 cm is no longer advantageous, since then the separation of coatings or other admixtures becomes more difficult.
  • the first stuffing screw on the feed side of the material is advantageously lock equipped. Pressure regulation is not absolutely necessary on the outlet side, since the pressure can drop to ambient pressure here.
  • Figure 1 shows the structure of an inventive
  • the stuffing screws had a uniform diameter of 400 mm and a length of 2.5 m. It was driven by electric motors with a uniform output of 10 kW.
  • the first stuffing screw was equipped with a high pressure lock with level indicator.
  • a steam supply line was arranged, which had a steam source for saturated steam of 5 bar abs. was connected.
  • the last stuffing screw had a vapor suction device at the end of the screw.
  • Chipboard material that had been crushed to a particle size of approx. 8x8x20 cm 3 was introduced into the first stuffing screw.
  • the screw was filled with preheated water, which had a temperature of approx. 90 ° C.
  • the feed speed of the stuffing screws was controlled so that there was a dwell time of about 5 minutes in each stuffing screw.
  • Saturated steam at a pressure of 4 bar overpressure was metered into the steam feed line of the third plug screw.
  • the chips produced at the exit of the last stuffing screw corresponded largely to the usual fresh chips, both visually and in terms of particle size.
  • the device shown in FIG. 1 contains five stuffing screws 1, 2, 3, 4 and 5 arranged one behind the other, which are driven by drive motors 6.
  • the axial exit area of each screw is flanged at right angles to the entry area of the subsequent stuffing screw in the axial direction, pressure-tight connections being used.
  • the stuffing screw 3 contains a steam supply 7, which is connected to a saturated steam source (not shown).
  • the stuffing screw 1 contains a feed device 8 for inputting the pulping material.
  • a vapor suction device or a spring screen 9 is arranged at the end of the last screw 5.
  • the device shown in Fig. 1 has overall five pressure or so-called stuffing screws 1, 2, 3, 4, 5, which are each driven by drive motors 6.
  • the preferably pre-broken wood-based material pieces are fed in as material feed on the first screw.
  • On the last screw 5, an end discharge opening with a spring cover is provided.
  • the five stuffing screws are arranged one behind the other and also serve as a digestion container and as a transport device for the wood-based material pieces.
  • Each stuffing screw has an outer casing 10 fixed to the housing and a drivable shaft 11 arranged therein with spirals 12 of a predeterminable pitch arranged around it. Between the turns of the spirals on the one hand and between the
  • the (inner) shaft and the (outer) outer jacket transport the particles.
  • the stuffing screws 2, 3, 4, 5 have the same, but possibly different, pitch of the helix.
  • the stuffing screw 1 has helices 13 with a changing diameter or pitch.
  • the pressure screw and the stuffing screw 3 are each arranged horizontally.
  • the stuffing screws 2 and 4 are arranged at an angle, preferably vertically.
  • the individual screws are connected in series in such a way that the wood-based material pieces in the axial direction (transport direction) 14 of the stuffing screw are transported from the feed opening 15 in the outer casing 10 to an end discharge opening 16 in the axial direction (transport direction 14), whereby
  • the inlet opening 7 for steam is provided between the feed opening and the discharge opening in the outer casing 10 in the stuffing screw 3.
  • the stuffing screw 2 can be equipped with an inlet opening 17 for water, preferably hot water. All stuffing screws, or at least some of them, can be designed to be heatable.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Disintegrating Or Milling (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Screw Conveyors (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un dispositif pour désagréger des morceaux de matériaux dérivés du bois, contenant de la cellulose et/ou de la lignocellulose, notamment des panneaux de particules, des panneaux de fibres de densité moyenne et similaires. Ce dispositif comprend une unité de transport et au moins un contenant de désagrégation. L'invention est caractérisée en ce que le contenant de désagrégation et l'unité de transport se présentent sous la forme d'au moins une vis de bourrage (1) commune, comportant une enveloppe extérieure solidaire du boîtier, à l'intérieur de laquelle se trouve un arbre pouvant être entraîné, comportant des spires dont le pas peut être prédéfini. Les morceaux de dérivés du bois sont acheminés dans le sens axial de la vis de bourrage (1) à partir d'une ouverture d'alimentation ménagée dans l'enveloppe extérieure, vers une ouverture de distribution côté face dans le sens axial (sens de transport). De plus, une ouverture d'introduction de vapeur (7) est ménagée entre l'ouverture d'alimentation et l'ouverture de distribution dans l'enveloppe extérieure.
PCT/EP2000/005612 1999-09-22 2000-06-17 Procede et dispositif pour desagreger des materiaux derives du bois WO2001021368A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE50008025T DE50008025D1 (de) 1999-09-22 2000-06-17 Vorrichtung und verfahren zum aufschluss von holzwerkstoffen
EP00942095A EP1222061B1 (fr) 1999-09-22 2000-06-17 Procede et dispositif pour desagreger des materiaux derives du bois
US09/959,393 US6648251B1 (en) 1999-09-22 2000-06-17 Device and method for disaggregating derived timber products
AU56833/00A AU5683300A (en) 1999-09-22 2000-06-17 Device and method for disaggregating derived timber products
JP2001524775A JP2003519581A (ja) 1999-09-22 2000-06-17 木材料を破砕分解する装置と方法
AT00942095T ATE277727T1 (de) 1999-09-22 2000-06-17 Vorrichtung und verfahren zum aufschluss von holzwerkstoffen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19945466.3 1999-09-22
DE19945466A DE19945466B4 (de) 1999-09-22 1999-09-22 Vorrichtung und Verfahren zum Aufschluss von Holzwerkstoffen

Publications (1)

Publication Number Publication Date
WO2001021368A1 true WO2001021368A1 (fr) 2001-03-29

Family

ID=7922938

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/005612 WO2001021368A1 (fr) 1999-09-22 2000-06-17 Procede et dispositif pour desagreger des materiaux derives du bois

Country Status (7)

Country Link
EP (1) EP1222061B1 (fr)
JP (1) JP2003519581A (fr)
AT (1) ATE277727T1 (fr)
AU (1) AU5683300A (fr)
DE (2) DE19945466B4 (fr)
ES (1) ES2226867T3 (fr)
WO (1) WO2001021368A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006334463A (ja) * 2005-05-31 2006-12-14 Sasaki Corporation 生物系物質の爆砕膨軟化装置
FI126796B (fi) * 2006-10-19 2017-05-31 Upm Kymmene Corp Puukomposiittimateriaali ja menetelmä sen valmistamiseksi
JP2011152679A (ja) * 2010-01-26 2011-08-11 Panasonic Electric Works Co Ltd 木質ボードの製造方法及び木質ボード
BE1028121B1 (nl) 2020-03-03 2021-10-06 Unilin Proces voor de productie van spaanplaat of houtvezelplaat

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741863A (en) * 1971-08-27 1973-06-26 Rust Eng Co Method of recycling waste cellulosic materials
WO1997038833A1 (fr) * 1996-04-12 1997-10-23 Marlit Ltd. Procede de production de materiaux lignocellulosiques composites
US5804035A (en) * 1994-03-15 1998-09-08 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Process for recovering chips and fibers from residues of timber-derived materials, old pieces of furniture, production residues, waste and other timber containing materials
DE19819988A1 (de) * 1997-05-16 1999-04-01 Fraunhofer Ges Forschung Anlage zum kontinuierlichen Aufschluß von Holzwerkstoffen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9625068D0 (en) * 1996-12-02 1997-01-22 Marlit Ltd Method for production of lignocellulosic composite materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741863A (en) * 1971-08-27 1973-06-26 Rust Eng Co Method of recycling waste cellulosic materials
US5804035A (en) * 1994-03-15 1998-09-08 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Process for recovering chips and fibers from residues of timber-derived materials, old pieces of furniture, production residues, waste and other timber containing materials
WO1997038833A1 (fr) * 1996-04-12 1997-10-23 Marlit Ltd. Procede de production de materiaux lignocellulosiques composites
DE19819988A1 (de) * 1997-05-16 1999-04-01 Fraunhofer Ges Forschung Anlage zum kontinuierlichen Aufschluß von Holzwerkstoffen

Also Published As

Publication number Publication date
ATE277727T1 (de) 2004-10-15
EP1222061B1 (fr) 2004-09-29
ES2226867T3 (es) 2005-04-01
EP1222061A1 (fr) 2002-07-17
AU5683300A (en) 2001-04-24
DE19945466A1 (de) 2002-10-24
JP2003519581A (ja) 2003-06-24
DE19945466B4 (de) 2004-09-23
DE50008025D1 (de) 2004-11-04

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