EP0573039B1 - Nattes en fibres cellulosiques et ligno-cellulosiques contenant un agent liant - Google Patents

Nattes en fibres cellulosiques et ligno-cellulosiques contenant un agent liant Download PDF

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Publication number
EP0573039B1
EP0573039B1 EP93108937A EP93108937A EP0573039B1 EP 0573039 B1 EP0573039 B1 EP 0573039B1 EP 93108937 A EP93108937 A EP 93108937A EP 93108937 A EP93108937 A EP 93108937A EP 0573039 B1 EP0573039 B1 EP 0573039B1
Authority
EP
European Patent Office
Prior art keywords
outer layers
mat
fiber
mats
layer
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
EP93108937A
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German (de)
English (en)
Other versions
EP0573039A1 (fr
Inventor
Albert Dr. Nicolay
Klaus Melzer
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.)
Lignotock GmbH
Original Assignee
Lignotock GmbH
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Filing date
Publication date
Application filed by Lignotock GmbH filed Critical Lignotock GmbH
Publication of EP0573039A1 publication Critical patent/EP0573039A1/fr
Application granted granted Critical
Publication of EP0573039B1 publication Critical patent/EP0573039B1/fr
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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
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres

Definitions

  • Binder-containing fiber mats made of cellulose or lignocellulosic fibers (wood fibers), which are processed into molded parts by hot pressing, are known in a wide variety of compositions and are pressed into self-supporting molded parts in various ways.
  • the shaping possibilities of such fiber mats during hot pressing are primarily limited by their inadequate tensile strength.
  • the low fiber cohesion of the only moderately compacted mats very soon leads to fiber separations during the forming process, so that locally faulty molded parts as rejects cannot always be avoided.
  • Binder concentrations in the surface influence the physical characteristics of the finished molded part, but have no influence on the deformability of the fiber mats.
  • Deformation aids in the form of power transmission cloths between the tool and the fiber mat stabilizing cloths
  • fabrics in the middle of the mat only leads to incomplete solutions to the problem.
  • the present problem can be characterized as follows: If complicated molded parts are desired, steaming of the wood fiber mats, multi-stage deformation and the use of stabilizing cloths are still necessary in production practice - all in all, an effort that makes production more difficult and more expensive.
  • the invention is therefore based on the object to provide wood fiber mats of the type described, the shaping behavior of which is improved without additional material expenditure.
  • outer layers defining the surfaces have a higher compression than the inner layers, which consist predominantly of the same material, initially increases their tensile strength, without additional material expenditure. They can therefore transmit more tensile forces and act like the additional stabilizing layers of the stated prior art.
  • Another advantage of mats according to the invention is that with an additional compression of more than 40% of the outer layers which contain at least 20% by weight of fiber material of the mat, the overall thickness of the mat is reduced.
  • Fiber mats of the type described are not only shaped in the manufacture of molded parts, but also compressed. Here occur at places where the molding surfaces of the tools are oriented approximately parallel to the pressing direction are shear forces in the fiber mat, which lead to tears and defects in the molded part.
  • the reduction in thickness of wood fiber mats according to the invention also creates better deformation conditions. In the central region of the mat, the fiber displaceability required for the deformability of the fiber mat is retained due to the lower mat compression given here.
  • the higher tensile strength of the higher density outer layers and the resulting improved deformability of the wood fiber mats, the still good mobility of the fibers in the larger part of the mat and the improved deformation conditions due to the improved geometrical conditions due to the reduced mat thickness work together in such a way that at Forming the mat blanks into shaped parts, the damping of the fiber mat blanks and additional traction-transmitting aids - such as fabric coverings - can be dispensed with in the majority of cases.
  • Wood fiber mats of the type described are in principle produced by spreading the glued wood fibers onto a running belt.
  • the fibers are given a preferred direction of orientation in the running direction of the belt.
  • the tensile strength of the outer layers with the higher compression is consequently anisotropic: across the direction of formation of the mats, it is significantly lower than in the direction of formation. This is disadvantageous for the formation of the mats into the molded part, since the tensile forces can act in any surface direction of the mat and must be transmitted.
  • the higher-density outer layer consists of a large number of individual layers, the fiber arrangements of which are approximately orthotropic to one another are oriented, that is to say they intersect approximately at an angle of 90 °, this disadvantage is avoided and the deformation properties of the fiber mat are independent of the directions of deformation, that is to say of the (later) molded part geometry.
  • the large number of individual layers from which the higher-density outer layers are formed with orthotropically oriented fibers makes it easier for the mats to be completely oriented in the entire volume of the outer layers, since only thin individual layers have to be "completely oriented".
  • a fiber orientation in which the orthotropic orientation of the fibers changes alternately in the individual layers can therefore be advantageous for mat production.
  • Wood fiber mats are often used to a small extent other fiber materials, e.g. Polymer fibers, mixed.
  • the term "longer fiber” refers to the length of the shorter wood fibers, which does not exceed 10 mm.
  • mats the outer layers of which have a specific weight of more than 0.5 g / cm 3, while the specific weight of the middle layer is between 0.3 and 0.4 g / cm 3, have an optimal range of properties with regard to manufacture and handling the mats as well as the molding production. Also the handling of the mats Their storage, for cutting and transportation is facilitated by higher density outer layers due to the increased plate rigidity.
  • Fig. 2 different scattering devices 6 are indicated for the formation of the outer layers, the thickened middle layer is spread by a further spreading head 7.
  • the circumferential belts 5, onto which the preferably identical and pre-glued fiber material is scattered, run in the direction of the arrow and effect the mat transport.
  • Two pairs of calender rolls 3 are preheated and cause both the compression of the two outer layers 2 and, if necessary, their stabilizing stabilization by softening at least one component of the binder without crosslinking.
  • a fiber orientation in the pre-compressed outer layers 2 of the fiber mat 1, 2 can be achieved, for example, in that the calender rolls 3 have surface patterns, for example in the form of oblique grooves.
  • FIG. 2 shows, for example, how three-layer mats 8 according to the invention can be produced. Other procedures, even a larger number of layers are possible; e.g. outer layers 2 identical to the material can also be prefabricated separately and connected to the middle layer 1 in another way.

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)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)

Claims (5)

  1. Natte stratifiée de fibres de lignocellulose ou de bois contenant un agent liant pour fabriquer des pièces moulées pour le garnissage interne de véhicules, caractérisée en ce que les couches externes constituant les surfaces présentent une densité supérieure à celle de la couche interne ou des couches internes constituées de manière prépondérante de la même matière, la fraction pondérale des couches externes formant au moins 20 % du poids de la natte totale et les couches externes présentant une densité supérieure d'au moins 40 %.
  2. Natte stratifiée selon la revendication 1, caractérisée en ce que chacune des couches externes est formée d'une série de couches individuelles, dont les réseaux fibreux ont une orientation approximativement orthotrope les uns par rapport aux autres.
  3. Natte stratifiée selon les revendications 1 et 2, caractérisée en ce que l'alignement orthotrope des fibres dans les couches individuelles varie en alternance.
  4. Natte stratifiée selon les revendications 1 à 3, caractérisée en ce que les couches externes présentent une fraction de fibres plus longues qui ne sont pas constituées de bois, de moins de 45 % par rapport au poids des couches externes.
  5. Natte stratifiée selon l'une quelconque des revendications précédentes, caractérisée en ce que les couches externes ont un poids spécifique de plus de 0,5 g/cm³ et en ce que le poids spécifique de la couche centrale se situe entre 0,3 et 0,4 g/cm³.
EP93108937A 1992-06-04 1993-06-03 Nattes en fibres cellulosiques et ligno-cellulosiques contenant un agent liant Expired - Lifetime EP0573039B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218444A DE4218444A1 (de) 1992-06-04 1992-06-04 Bindemittelhaltige Fasermatten aus Zellulose- bzw. Lignozellulosefasern
DE4218444 1992-06-04

Publications (2)

Publication Number Publication Date
EP0573039A1 EP0573039A1 (fr) 1993-12-08
EP0573039B1 true EP0573039B1 (fr) 1995-08-30

Family

ID=6460394

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108937A Expired - Lifetime EP0573039B1 (fr) 1992-06-04 1993-06-03 Nattes en fibres cellulosiques et ligno-cellulosiques contenant un agent liant

Country Status (5)

Country Link
EP (1) EP0573039B1 (fr)
JP (1) JPH06235153A (fr)
CA (1) CA2097663A1 (fr)
DE (2) DE4218444A1 (fr)
ES (1) ES2078087T3 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342789C2 (de) * 1993-12-15 1996-03-07 Lignotock Gmbh Verfahren zum Herstellen von Formteilen
DE4434876B4 (de) * 1994-09-29 2004-09-16 Dieffenbacher Gmbh + Co. Kg Verfahren und Anlage zur kontinuierlichen Herstellung einer Mehrschichtplatte
DE4438764A1 (de) * 1994-10-29 1996-05-02 Hp Chemie Pelzer Res & Dev Verbundwerkstoff für die Automobilindustrie
DE19535559C1 (de) * 1995-09-12 1997-05-15 Lignotock Gmbh Flexible, in der Wärme verpreßbare Holzwerkstoffmatte
DE19606262C1 (de) * 1996-02-21 1997-04-17 Glunz Ag Verfahren und Vorrichtung zur Herstellung einer mitteldichten Faserplatte
US6197414B1 (en) 1997-12-25 2001-03-06 Matsushita Electric Works, Ltd. Fiberboard and manufacturing method thereof
DE10320686B4 (de) * 2003-04-30 2015-02-05 Faurecia Innenraum Systeme Gmbh Verfahren zur Herstellung von Formkörpergrundmaterial
DE102004062649C5 (de) 2004-12-21 2013-06-06 Kronotec Ag Verfahren zur Herstellung einer Holzfaserdämmstoffplatte bzw.-matte und nach diesem Verfahren hergestellte Holzfaserdämmstoffplatten bzw.-matten
DE102005038734A1 (de) 2005-08-16 2007-02-22 Michanickl, Andreas, Prof.Dr. Leichte Mehrschicht-Holzwerkstoffplatte
DE102005057606A1 (de) * 2005-12-02 2007-06-06 Günther Isensee Modellbaubedarf Verfahren zur Herstellung einer Balsaholzspanplatte
DE102009056581A1 (de) 2008-11-25 2010-06-10 Technische Universität Dresden Lignocellulose Fasern enthaltendes lagerfähiges Halbzeug und Verfahren zu dessen Herstellung
EP2695711A1 (fr) * 2012-08-09 2014-02-12 Dascanova GmbH Procédé et appareil pour la production d'un élément à base de particules avec précompression d'une partie des particules

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1100927B (de) * 1958-03-04 1961-03-02 Ind Companie Kleinewefers Kons Verfahren und Vorrichtung zum Ausrichten der Spaene eines Span-bettes zur Erzeugung von Spanplatten
CH382437A (fr) * 1959-09-09 1964-09-30 Abitibi Power & Paper Co Produit ligneux stratifié et procédé pour sa fabrication
FR2281214A1 (fr) * 1974-08-05 1976-03-05 Azote & Prod Chim Procede de fabrication en continu de panneaux de particules
DE7535229U (de) * 1975-11-06 1976-03-18 G. Siempelkamp & Co, 4150 Krefeld Spanplatte, faserplatte oder dergleichen
US4283450A (en) * 1976-11-05 1981-08-11 Masonite Corporation Product containing high density skins
DE3233385C2 (de) * 1981-10-02 1984-05-17 Günter Hans 1000 Berlin Kiss Mehrschicht-Faserverbundstoff und Verfahren zu dessen Herstellung
JPS5876561A (ja) * 1981-10-02 1983-05-09 ギユンタ−・ハ−・キス 多層繊維マツト及びその製造方法
SE458839B (sv) * 1988-03-16 1989-05-16 Inst Traeteknisk Forskning Foerfarande vid framstaellning av spaanskivor jaemte spaanskiva framstaelld enligt foerfarandet

Also Published As

Publication number Publication date
ES2078087T3 (es) 1995-12-01
EP0573039A1 (fr) 1993-12-08
DE59300524D1 (de) 1995-10-05
CA2097663A1 (fr) 1993-12-05
JPH06235153A (ja) 1994-08-23
DE4218444A1 (de) 1993-12-09

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