EP0839616B1 - Procédé de préparation de panneaux de bois avec un liant organique - Google Patents

Procédé de préparation de panneaux de bois avec un liant organique Download PDF

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Publication number
EP0839616B1
EP0839616B1 EP97114775A EP97114775A EP0839616B1 EP 0839616 B1 EP0839616 B1 EP 0839616B1 EP 97114775 A EP97114775 A EP 97114775A EP 97114775 A EP97114775 A EP 97114775A EP 0839616 B1 EP0839616 B1 EP 0839616B1
Authority
EP
European Patent Office
Prior art keywords
press
desired thickness
board
spacing
thickness
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.)
Expired - Lifetime
Application number
EP97114775A
Other languages
German (de)
English (en)
Other versions
EP0839616A3 (fr
EP0839616A2 (fr
Inventor
Volker Dipl.-Ing. Thole
Jadranko Dipl.-Ing. Jahic
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP0839616A2 publication Critical patent/EP0839616A2/fr
Publication of EP0839616A3 publication Critical patent/EP0839616A3/fr
Application granted granted Critical
Publication of EP0839616B1 publication Critical patent/EP0839616B1/fr
Anticipated expiration legal-status Critical
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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
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off

Definitions

  • the invention relates to a method for producing wood materials from lignocellulose-containing Particles such as chips and fibers and organic binders.
  • Wood materials made of fibers, chips or strands can be produced particularly efficiently using organic binders.
  • Condensation resins urea and phenol formaldehyde
  • isocyanates as well as mixtures of these binders are mainly used for gluing.
  • the curing time of organic binders depends on the temperature and time. For reasons of economy, the nonwovens formed from glued particles are compressed in hot presses.
  • the pressing time among other factors (type of binder, shape of the particles, fleece structure), is crucially determined by the time required for the fleece to warm up to the gelling temperature of the binder. Since the economic efficiency of the production of wood-based materials is significantly influenced by the necessary pressing time t p , a rapid warming of the fleece should be aimed for.
  • the heat transfer from the hot press plates into the fleece takes place through heat conduction and flow.
  • High densities result in high flow resistance, low humidities are unfavorable for heat conduction.
  • the mechanical requirements for wood-based materials require board densities, where the high flow resistance already has a noticeable effect on the pressing time. It is not expedient to compensate for this negative influence of the density by a higher particle moisture of the entire chip mass.
  • the heating time can be shortened, but the total pressing time is not reduced because the steam has to escape through the narrow surfaces of the plate.
  • DE F1658 XII / 381 proposes the humidity of the to vary individual layers of a plate.
  • the warming is favored when the Cover layers are significantly wetter than the middle layer.
  • the particle moisture must be like this be set so that the amount of steam flowing into the middle layer heats up faster causes without simultaneously creating an internal pressure that the glue joints between the Middle layer particles destroyed when opening the press. (Platzer).
  • the usable for warming up Steam energy is therefore limited.
  • a targeted warming with steam, which from the moist cover layers in the Flowing middle class is the physical background of the one developed by Klauditz Steam process.
  • the spraying of water on the cover layers is related to the Warming up better than using chips with higher moisture.
  • the evaporation of water, which is integrated as moisture in the wood structure, requires more energy than that Water deposited on the chip surfaces (Kollmann, HRW 1957, pp. 35-44; Keylwerth, Wood research and wood utilization 1959, pp. 51-57; Stegmann, v. Bismark, wood research and Wood recycling 1967, pp. 53-59).
  • the time until the fleece center is heated to boiling temperature depends on the heating plate temperature and the amount of water m w sprayed on each surface. From a certain amount of water onwards, several studies show a decreasing relationship between the amount of water applied and the warming-up time. In practice, therefore, water quantities of more than 200 g / m 2 are not expedient in the case of chipboard with a thickness of 20 mm. In addition, large amounts of water sprayed on reduce the resistance to bending and lifting. High heating plate temperatures promote rapid evaporation of the sprayed water. The warm-up time is getting shorter.
  • the object of the present invention is to provide a method with which, in a conventional heating press press times can be realized, which are significantly shorter than with Steam process.
  • the press can after the over-compression, be briefly opened further than it corresponds to the plate thickness (Press plate distance> target thickness of the plate). The flow resistance is then even lower Heating of thick plates in particular is favored.
  • Binders contain e.g. Starch or proteins.
  • thermocouple With a thermocouple inserted in the middle of the fleece, a temperature of 100 ° C. was determined after 110 s (pressing phase t D ). With the selected specific pressing time of 11 s / mm, the plate had to remain in the press for a further 66 s (pressing phase t H ). The temperature profile corresponds to curve 1 in Fig. 1.
  • thermocouple With a thermocouple inserted in the middle of the fleece, a temperature of 100 ° C. was determined after 132 s (pressing phase t D ). With the specific pressing time selected of 13 s / mm, the plate had to remain in the press for a further 76 s (pressing phase t H ).
  • Example 6 With the same glued fibrous material as in Example 6, another panel was produced. In contrast to Example 6, however, a quantity of water corresponding to 100 g / m 2 was sprayed onto each fleece surface after the pre-compaction.
  • the fleece was first compressed to a plate thickness of 14 mm. At a temperature of 60 ° C in the middle of the plate, the distance between the press plates was increased to the nominal thickness of the plate (16 mm).
  • the shortening of the pressing time for the new specific pressing time was 7.6 s / mm, compared to the pressing time in Example 6, 87 s.
  • a fleece prepared as in Example 2 was first compressed in the hot press at a compression speed of 7 mm / s to a plate thickness of 14 mm.
  • the distance between the press plates was increased to 17 mm and after a while reduced from 3 s to the nominal thickness of the plate (16 mm).
  • the shortening of the pressing time for the new specific pressing time was 6.9 s / mm, compared to the pressing time in Example 1, 65 s.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (9)

  1. Procédé de fabrication de matériaux en bois à partir de particules contenant de la cellulose ligneuse et de liants organiques,
    caractérisé en ce qu'
    on laisse séjourner (phase de compression t0) une nappe dans une presse à chaud pendant une durée de 20 à 90 s, à l'état non comprimé correspondant à 0,80-0,98 dcons, au moins pendant la durée nécessaire pour que, par pulvérisation de 50-100 g d'eau par côté de la nappe, les couches de recouvrement humidifiées présentent une variation de l'état d'agrégation de l'eau de la phase liquide à la phase vapeur et pour que la teneur en énergie de la vapeur soit suffisante pour induire au milieu de la nappe une augmentation spontanée de température T d'au moins 15°C, lorsqu'on augmente ensuite l'intervalle des plateaux de pression à l'épaisseur de consigne de la plaque (dcons) (phase de pression tH)
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    en pulvérisant une quantité d'eau mw par mm d'épaisseur de plaque d telle que 4,5 g/m2 • d < mw < 10 • d g/m2, les surfaces de la nappe sont réglées beaucoup plus humides que les particules de la couche médiane.
  3. Procédé selon la revendication 1,
    caractérisé en ce qu'
    au moins une partie des particules de la couche de recouvrement, après encollage, a une humidité ω par mm d'épaisseur de plaque d telle que 1,25 % • d < ω < 7 % • d.
  4. Procédé selon la revendication 1,
    caractérisé en ce que
    la distance des plateaux de pression est augmentée à l'épaisseur de consigne du plateau de bois, quand le milieu des plaques atteint une température comprise entre 25°C et 90°C.
  5. Procédé selon la revendication 1,
    caractérisé en ce que
    la distance des plateaux de pression est augmentée à l'épaisseur de consigne des plateaux de bois, lorsque dans une zone dépendant de l'épaisseur de consigne du bois, de 1 mm en dessous de la surface de la plaque et de 1,5 mm au-dessus du milieu de la plaque, on atteint la température d'ébullition de l'eau.
  6. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    directement après avoir agrandi la distance entre les plaques de pression jusqu'à l'épaisseur de consigne de la plaque en bois, on effectue de nouveau une surcompression et une augmentation de la distance des plaques de pression jusqu'à l'épaisseur de consigne.
  7. Procédé selon la revendication 6,
    caractérisé en ce qu'
    on répète la surcompression et l'augmentation de la distance des plaques de pression jusqu'à l'épaisseur de consigne.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    on augmente encore plus la distance des plaques de pression au-delà de ce qui correspond à l'épaisseur de consigne de la plaque en bois et après un temps d'attente de moins de 5 s on réduit la distance des plaques de pression à l'épaisseur de consigne du panneau en bois.
  9. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    après avoir agrandi la distance des plateaux de pression jusqu'à l'épaisseur de consigne, on a une pression spécifique ps telle que 0,1 N/mm2 < ps < 1,0 N/mm2.
EP97114775A 1996-10-01 1997-08-26 Procédé de préparation de panneaux de bois avec un liant organique Expired - Lifetime EP0839616B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19640593 1996-10-01
DE19640593A DE19640593A1 (de) 1996-10-01 1996-10-01 Verfahren zur Herstellung organischgebundener Holzwerkstoffe

Publications (3)

Publication Number Publication Date
EP0839616A2 EP0839616A2 (fr) 1998-05-06
EP0839616A3 EP0839616A3 (fr) 1999-05-06
EP0839616B1 true EP0839616B1 (fr) 2002-04-10

Family

ID=7807638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97114775A Expired - Lifetime EP0839616B1 (fr) 1996-10-01 1997-08-26 Procédé de préparation de panneaux de bois avec un liant organique

Country Status (5)

Country Link
US (1) US5942174A (fr)
EP (1) EP0839616B1 (fr)
AT (1) ATE215875T1 (fr)
CA (1) CA2216992C (fr)
DE (2) DE19640593A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1009601B2 (fr) † 1997-03-18 2007-11-14 WESSER &amp; DUEHOLM Procede de fabrication de panneaux de particules, de panneaux de fibres et de planches analogues

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030127763A1 (en) * 2001-08-16 2003-07-10 Josef Stutz Mechanically glued board of wood material
DE10163090A1 (de) * 2001-12-20 2003-07-03 Dieffenbacher Gmbh Maschf Verfahren zur kontinuierlichen Herstellung von Holzwerkstoffplatten
US6790271B2 (en) * 2002-07-11 2004-09-14 The University Of Southern Mississippi Soy protein based adhesive containing a vegetable oil derivative
US20040173306A1 (en) * 2002-10-24 2004-09-09 University Of Southern Mississippi Particleboard and method for forming a particleboard
US7081159B2 (en) * 2004-03-19 2006-07-25 The University Of Southern Mississippi Soy protein based adhesive and particleboard
KR101965494B1 (ko) * 2017-07-31 2019-04-03 정성봉 재생 가능한 자동차용 폴리에틸렌 부직포 에어크리너 및 그 제조방법

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198269A (en) * 1934-05-02 1940-04-23 United States Gypsum Co Manufacture of compressed cellulosic or wood products
US3280237A (en) * 1963-04-22 1966-10-18 Weyerhaeuser Co Method of pressing composite consolidated articles
DE2022910A1 (de) * 1969-05-23 1970-11-26 Alenius Dipl Ing Nils Robert Verfahren und Vorrichtung zum Pressen
US4393019A (en) * 1981-11-30 1983-07-12 The United States Of America As Represented By The Secretary Of Agriculture Method of pressing reconstituted lignocellulosic materials
US4517147A (en) * 1984-02-03 1985-05-14 Weyerhaeuser Company Pressing process for composite wood panels
CA1255470A (fr) * 1985-05-15 1989-06-13 Karl Walter Fabrication d'un panneau de bois reconstitue
DE8817135U1 (fr) * 1988-07-29 1993-03-18 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De
GB2302023A (en) * 1996-09-13 1997-01-08 Derek John Goldsmith Method for controlling the sleep pattern of a baby

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1009601B2 (fr) † 1997-03-18 2007-11-14 WESSER &amp; DUEHOLM Procede de fabrication de panneaux de particules, de panneaux de fibres et de planches analogues

Also Published As

Publication number Publication date
DE59706951D1 (de) 2002-05-16
EP0839616A3 (fr) 1999-05-06
ATE215875T1 (de) 2002-04-15
DE19640593A1 (de) 1998-04-09
CA2216992A1 (fr) 1998-04-01
US5942174A (en) 1999-08-24
CA2216992C (fr) 2005-03-15
EP0839616A2 (fr) 1998-05-06

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