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EP0462586B1 - Planche ressemblant à du bois - Google Patents

Planche ressemblant à du bois Download PDF

Info

Publication number
EP0462586B1
EP0462586B1 EP91110039A EP91110039A EP0462586B1 EP 0462586 B1 EP0462586 B1 EP 0462586B1 EP 91110039 A EP91110039 A EP 91110039A EP 91110039 A EP91110039 A EP 91110039A EP 0462586 B1 EP0462586 B1 EP 0462586B1
Authority
EP
European Patent Office
Prior art keywords
woody
board
substrate
thickness
molded
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
EP91110039A
Other languages
German (de)
English (en)
Other versions
EP0462586A2 (fr
EP0462586A3 (en
Inventor
Yusho Nakamoto
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.)
Juken Sangyo Co Ltd
Original Assignee
Juken Sangyo Co Ltd
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 Juken Sangyo Co Ltd filed Critical Juken Sangyo Co Ltd
Publication of EP0462586A2 publication Critical patent/EP0462586A2/fr
Publication of EP0462586A3 publication Critical patent/EP0462586A3/en
Application granted granted Critical
Publication of EP0462586B1 publication Critical patent/EP0462586B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B27N3/06—Making particle boards or fibreboards, with preformed covering layers, the particles or fibres being compressed with the layers to a board in one single pressing operation
    • 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
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring

Definitions

  • the present invention relates to a woody board, which has a sufficient mechanical strength as a woody material and which has a smooth surface.
  • a wood powder and woody fibers are well known in this technical field. Briefly, the former is one to be obtained by finely pulverizing wood like sawdust; and the latter are ones to be obtained by disintegrating wood into fibers. Wood chips in this case are also known, which are obtained by shaving or cutting a wood bar from the top end thereof, with the bar being rotated in such a way that a pencil is shaven, into chips each having a size of about 1.5 mm or less as the thickness, about 30 mm or less as the width and about 100 mm or less as the length. Examples of molded boards made of such woody material will be mentioned.
  • simplex boards made of a wood powder there is known a particle board; as examples of simplex boards made of woody fibers, there are a hard board, a middle density fiber board (MDF) and an insulation board; and as examples of simplex boards made of wood chips, there are a strand board and an oriented strand board (OSB).
  • MDF middle density fiber board
  • OSB oriented strand board
  • the latter method also has a troublesome problem that the mechanical strength of the resulting laminate board is low, because of the following reasons.
  • an MDF could not be thinner than 3 mm, as too thin MDF sheets would curve owing to insufficiency of the strength of them. Therefore, even when the thinnest known MDF sheet having a thickness of 3 mm is laminated to the both surfaces of a substrate of woody material by the known method, and with the plywood having a total thickness of the two laminated MDF's, that is to say of 6 mm, the mechanical strength of the plywood is lowered relative to the thickness. In this connection, if an MDF sheet is laminated onto only one surface of a substrate, the resulting plywood laminate is also disadvantageous as it is often warped.
  • FR-A-2 568 510 discloses two ways of manufacturing a laminate. According to the first way two layers of adhesively bonded particles are laid down as molded layers by extruding devices, one of the layers being extruded onto the top of the other layer. Then a wooden core, that can comprise a plurality of layers, is added on top. Thereafter two more layers, similar to the first two layers, are added by extruding devices. The resulting composite structure is then pressed together between heated platens. In the finalized product the outer extruded layer can be of a quality more suitable for the smoothness of the outer faces than the quality of the extruded layers that are in direct contact with the wooden core.
  • One object of the present invention is to provide a woody board, which has good physical properties with respect to the mechanical strength, the surface smoothness and the screw-drawing resistance value and which is prepared at a low manufacture cost.
  • Another object of the present invention is to provide a method of preparing a woody board which has good physical properties with respect to surface smoothness, screw-drawing resistance value and mechanical strength.
  • Still another object of the present invention is to provide a method of preparing the woody board of the present invention.
  • a woody board of the present invention comprises an integrally molded layer of woody fibers provided on one surface or both surfaces of a woody substrate of plywood;
  • the thickness of the molded layer of woody fibers can be 1 to 2mm.
  • the woody board may be one provided with said molded layer on both surfaces of the woody substrate and pressed so as to integrally form a middle density fiber board having a thickness of 1mm; and wherein each molded layer is laminated with a decorative veneer.
  • the woody substrate can be a coniferous tree plywood or a coniferous laminated veneer lumber comprising five coniferous tree strips pressed together in a direction perpendicular to the fibrous direction of each strip.
  • the thickness of each veneer may be 2.5mm.
  • the woody board may have said molded layer of woody fibers on one surface only of said woody substrate and the resulting woody board may have an arrow height warp of 1.5mm at the center of a length of 185Omm.
  • a woody material mix obtained by blending an adhesive and woody fibers is molded on at least one surface of a woody substrate of a coniferous tree plywood;
  • the woody material mix may be applied to the woody substrate by a hot-pressing method.
  • the hot-pressing method may be a hot plate-pressing method.
  • the hot-pressing method may be a hot roll-pressing method.
  • the woody substrate and the molded layer of woody fibers are pressed simultaneously under heat and pressure.
  • the coniferous tree plywood or LVL may be either in the form of a previously shaped one or in the form of a combination of plural veneers as merely piled up prior to being shaped into a plywood.
  • the raw material of a board to be used in the present invention which comprises a woody material of woody fibers and an adhesive, may be one to be specifically prepared for repairing.
  • MDF middle density fiber board
  • the hot-pressing method of forming the woody board of the present invention may be either a hot plate-pressing method or a hot roll-pressing method.
  • a hot plate or a hot roll may be applied to the materials to be laminated and molded under pressure, or a hot steam may also be applied thereto under pressure.
  • the materials to be laminated and molded may previously be heated by blowing a hot steam thereto or by heating them in an oven, and the thus pre-heated materials may be pressed and integrated to obtain the intended woody board.
  • a hot-gluing adhesive is used since the molding materials and laminates are pressed under heat to give an integrated woody board.
  • Any conventional adhesives well known in this technical field such as phenolic resins and melamine resins, can be used for the purpose.
  • thermosetting and water-proofing resins such as melamine resins are selectively used, the water-proofness of the molded board layers is advantageously improved.
  • the thickness of the molded layer of a woody material may well be increased or decreased in accordance with the object of the woody board to be prepared. For instance, where the object of the board is to have merely a smooth surface, the layer of the molded layer may be thin to have a thickness of from 1 to 2 mm after being shaped.
  • the molded layer of a woody material is put on the both surfaces of the substrate both in the same thickness, in view of the balance to be formed.
  • the thickness of the molded layer of a woody material may well be much similar than that of the substrate, it is possible to prepare a one side-molded woody board with no warp and it is also possible to prepare a both sides-molded woody board where the molded layer on the two surfaces each have a different thickness.
  • the woody material for the molded layer may be either in the form of an already cold-pressed sheet or an adhesive-applied but not cold-pressed sheet. In the latter case, the woody material is in the form of a compound of woody fibers as already blended with an adhesive. If desired, the woody material for a molded layer may also be in the form of a sheet obtained by pre-hot-pressing the woody fibers along with said adhesive. If desired a two-stage polymerizing resin may advantageously be used as an adhesive. Further, the respective woody material layers may be pre-shaped by a first hot-pressing and thereafter they are integrated by a second hot-pressing.
  • the layers of coniferous wood in the present invention are preferably a coniferous tree plywood or a coniferous tree LVL in view of the objects of the present invention.
  • An adhesive may be coated to said layers to give a molded coniferous tree plywood or LVL.
  • the resulting coniferous tree plywood or LVL layer is used as the woody substrate.
  • the woody substrate may also be in the form of a sheet as prepared by hot-pressing the corresponding plywood or LVL piled strips, or in the form of a cold-pressed piled strips prior to hot-pressing, or in the form of an adhesive-applied but not cold-pressed layer of veneers or laminars.
  • the woody substrate is a coniferous tree veneer or coniferous tree LVL
  • the board layer may well have a thickness of 3 mm or less in order to obtain the intended woody board.
  • the woody board of the present invention has a smooth surface and a high mechanical strength.
  • an extremely thin woody material molded layer may be formed on the surface(s) of the woody laminate substrate. Therefore, even though the coat may be formed on only one surface of the substrate to form a one surface-molded board, the resulting one surface-molded board is advantageously free from warping.
  • a melamine resin adhesive was applied to five sheets of Douglas fir rotary veneer each having a thickness of 2.5 mm in the direction perpendicular to the fibrous direction of each sheet by a known method of forming a conventional plywood, and the thus adhesive coated sheets were cold-pressed to form a woody substrate.
  • the veneers constituting the surfaces of the substrate had 25 knots, each having a diameter of approximately 35 mm in the area of 1850 mm x 980 mm.
  • woody material wood of Douglas fir rotary veneer was finely reduced to fibers, and the resulting wood fibers were blended with 12 % of a melamine resin adhesive by spraying to prepare a woody material mix for a MDF material. This was put in an iron plate in a thickness of 15 mm, and the previously cold-pressed plywood was put thereover. Further, woody material mix was put over the plywood in a thickness of 15 mm.
  • a decorative veneer of Douglas fir having a thickness of 0.6 mm was stuck to one surface of the woody board to give a decorative plywood having an extremely flat and smoothly finished surface.
  • the woody board thus obtained warped with the smooth surface being convex in such a condition that the arrow height was 1.5 mm to the length of 1850 mm.
  • the warp of such a degree has heretofore been said to cause no problem in practical use of the board, and the board stood the product standard test.
  • Example 2 In accordance with the same process as in Example 1, except that the thickness of the rotary veneer of Douglas fir, which was 2.5 mm in Example 1, was varied to 1.7 mm, a laminate substrate was prepared. Both surfaces of the substrate were coated with an MDF having a thickness of 3 mm, in place of the woody material as used in Example 1. The thus piled-up woody layers were then hot-pressed in the same way as in Example 1 to obtained a woody material having the same thickness as that obtained in Example 1.
  • the thus prepared woody material had a low and insufficient mechanical strength relative to the thickness thereof and therefore it was not suitable to practical use.
  • the mechanical strength values of the product are shown in Table 1 below.
  • Example 2 The same process as in Example 1 was repeated, except that the thickness of the rotary veneer of Douglas fir rotary veneer, which was 2.5 mm in Example 1, was varied to 2.9 mm and that the woody material was not used, but a coniferous tree plywood was only used. Accordingly, a decorative plywood having almost the same thickness as that of the product of Example 1 was prepared.
  • the decorative plywood thus prepared had many knots and cracks, and the outward appearance thereof did not stand the test.
  • substantially warp-free woody boards and decorated boards which have smooth and flat surfaces as their outward appearance and which have a sufficient mechanical strength are obtained by the method of the present invention, and the industrial advantage of the present invention is noticeable.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Laminated Bodies (AREA)

Claims (10)

  1. Panneau ligneux comprenant une couche de fibres ligneuses moulée en une seule pièce disposée sur une surface ou sur les deux surfaces d'un substrat ligneux de contre-plaqué,
    dans lequel ledit substrat ligneux est constitué de plusieurs feuilles de plaquage d'arbre stratifiées afin de former ledit substrat, et dans lequel
    ladite couche moulée de fibres ligneuses est une couche qui a été pressée et moulée sur ledit substrat,
    caractérisé en ce que
    ledit substrat est constitué de cinq couches de bois de conifère, le substrat présente une épaisseur de 12,5 mm, et en ce que la couche moulée est sous la forme d'un panneau de fibres de densité moyenne présentant une épaisseur de 3 mm ou moins.
  2. Panneau ligneux selon la revendication 1, dans lequel l'épaisseur de la couche moulée de fibres ligneuses est de 1 à 2 mm.
  3. Panneau ligneux selon la revendication 1 et dans lequel ladite couche moulée est disposée sur les deux surfaces du substrat ligneux et pressée de manière à former en une seule pièce un panneau de fibres de densité moyenne présentant une épaisseur de 1 mm, et dans lequel chaque couche moulée est stratifiée avec un placage décoratif.
  4. Panneau ligneux selon la revendication 1, dans lequel le substrat ligneux est un contre-plaqué d'arbres conifères ou un bois de plaquage stratifié de conifères comprenant cinq bandes d'arbres conifères pressées ensemble dans une direction perpendiculaire à la direction des fibres de chaque bande.
  5. Panneau ligneux selon la revendication 1, dans lequel l'épaisseur du placage est de 2,5 mm.
  6. Panneau ligneux selon la revendication 1, dans lequel ladite couche moulée de fibres ligneuses est sur une seule surface dudit substrat ligneux et le panneau ligneux résultant présente une hauteur de flèche de gauchissement de 1,5 mm au niveau du centre d'une longueur de 1 850 mm dudit panneau ligneux.
  7. Procédé de préparation d'un panneau ligneux dans lequel un mélange de matériau ligneux obtenu en mélangeant un adhésif et des fibres ligneuses est moulé sur au moins une surface d'un substrat ligneux d'un contre-plaqué d'arbres conifères,
    le substrat ligneux étant fait à partir de cinq feuilles d'un placage d'arbres conifères qui ont été stratifiées afin de former un substrat présentant une épaisseur de 12,5 mm,
    et dans lequel la couche ou chaque couche de mélange de matériau ligneux est pressée et moulée sur ledit substrat afin de créer un panneau de fibres de densité moyenne présentant une épaisseur de 3 mm ou moins.
  8. Procédé selon la revendication 7, dans lequel le mélange de matériau ligneux est appliqué sur le substrat ligneux au moyen d'un procédé de pressage à chaud.
  9. Procédé selon la revendication 8, dans lequel le procédé de pressage à chaud est un procédé de pressage par plaque à chaud.
  10. Procédé selon la revendication 8, dans lequel le procédé de pressage à chaud est un procédé de pressage par rouleau à chaud.
EP91110039A 1990-06-19 1991-06-19 Planche ressemblant à du bois Expired - Lifetime EP0462586B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP160399/90 1990-06-19
JP16039990 1990-06-19
JP2160399A JP3038488B2 (ja) 1990-06-19 1990-06-19 針葉樹木質材の製造方法

Publications (3)

Publication Number Publication Date
EP0462586A2 EP0462586A2 (fr) 1991-12-27
EP0462586A3 EP0462586A3 (en) 1993-01-13
EP0462586B1 true EP0462586B1 (fr) 1999-08-25

Family

ID=15714107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110039A Expired - Lifetime EP0462586B1 (fr) 1990-06-19 1991-06-19 Planche ressemblant à du bois

Country Status (7)

Country Link
EP (1) EP0462586B1 (fr)
JP (1) JP3038488B2 (fr)
KR (1) KR0183985B1 (fr)
AU (1) AU653529B2 (fr)
CA (1) CA2044865C (fr)
DE (1) DE69131547T2 (fr)
NZ (1) NZ238616A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006012116U1 (de) * 2006-08-08 2007-12-27 Vöhringer GmbH Holzwerkstoffplatte

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855832A (en) * 1996-06-27 1999-01-05 Clausi; Robert N. Method of molding powdered plant fiber into high density materials
FI972955A (fi) * 1997-07-11 1999-01-12 Roctex Oy Ab Kuitumatto
US6309492B1 (en) * 1998-09-16 2001-10-30 Marc A. Seidner Polymer fill coating for laminate or composite wood products and method of making same
KR100446710B1 (ko) * 2002-07-04 2004-09-07 김태홍 합성목재를 이용한 건축용 패널 및 그 제조 방법
RU2007124945A (ru) * 2007-07-02 2009-01-10 Михаил Мукарасович Ахмеджанов (RU) Способ получения древесных плит
JP5736582B2 (ja) * 2010-10-07 2015-06-17 地方独立行政法人北海道立総合研究機構 抜け節の防止方法ならびにその木質材料
JP2014083810A (ja) * 2012-10-25 2014-05-12 Nichiha Corp 木質系化粧台板複合基材
JP6782524B2 (ja) * 2014-04-02 2020-11-11 ニチハ株式会社 木質ボード及び化粧合板
FI129218B (fi) 2016-11-22 2021-09-30 Metsaeliitto Osuuskunta Pinnoitettu monikerroksinen puulevy ja menetelmä runkolevyn valmistamiseksi
JP6985657B2 (ja) * 2017-03-13 2021-12-22 地方独立行政法人北海道立総合研究機構 木質複合板の製造方法
JP7149817B2 (ja) * 2018-11-19 2022-10-07 ニチハ株式会社 木質ボード及び化粧合板の製造方法

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
NO85681A (fr) * 1944-08-09
FR1444912A (fr) * 1965-05-28 1966-07-08 Panneau composite et procédé perfectionné pour sa fabrication
DE1653323A1 (de) * 1966-05-06 1971-02-04 Triangel Spanplattenwerke Der Verfahren zur Herstellung einer Mehrschichtplatte aus Holzwerkstoffen
BE788503A (nl) * 1972-09-07 1973-01-02 Santens Paul E G El volgens deze werkwijze vervaardigd. werkwijze ter vervaardiging van een paneel en pane
NZ200674A (en) * 1981-05-26 1985-09-13 Earl Herbert Robbins A composite wood panel that is veneered and has an intermediate veneer
FR2568510B1 (fr) * 1984-08-01 1986-09-05 Garcia Jean Fabrication de panneaux de particules d'agglomeres et ou de fibres, comportant une ame en bois, ou tout autre materiau. bois deroule tranche ou scie
SE445568B (sv) * 1984-10-08 1986-06-30 Hammarberg Lars Skivmaterial, foretredesvis for anvendning som gjutformskiva, uppbyggt av kompositlaminat med glasfibersnoren i ytterskikten
SE461775B (sv) * 1986-04-24 1990-03-26 Swedoor Ab Foerfarande foer tillverkning av djupformad skiva
SE458839B (sv) * 1988-03-16 1989-05-16 Inst Traeteknisk Forskning Foerfarande vid framstaellning av spaanskivor jaemte spaanskiva framstaelld enligt foerfarandet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006012116U1 (de) * 2006-08-08 2007-12-27 Vöhringer GmbH Holzwerkstoffplatte

Also Published As

Publication number Publication date
EP0462586A2 (fr) 1991-12-27
CA2044865C (fr) 2000-03-14
KR0183985B1 (ko) 1999-04-01
NZ238616A (en) 1994-07-26
JP3038488B2 (ja) 2000-05-08
CA2044865A1 (fr) 1991-12-20
DE69131547D1 (de) 1999-09-30
DE69131547T2 (de) 2000-01-13
JPH0452102A (ja) 1992-02-20
KR920000447A (ko) 1992-01-29
AU7914991A (en) 1992-01-02
EP0462586A3 (en) 1993-01-13
AU653529B2 (en) 1994-10-06

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