WO1987005956A1 - Procede et appareil de formage, en particulier de pliage, de panneaux en fibres de bois durcis - Google Patents

Procede et appareil de formage, en particulier de pliage, de panneaux en fibres de bois durcis Download PDF

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Publication number
WO1987005956A1
WO1987005956A1 PCT/SE1987/000160 SE8700160W WO8705956A1 WO 1987005956 A1 WO1987005956 A1 WO 1987005956A1 SE 8700160 W SE8700160 W SE 8700160W WO 8705956 A1 WO8705956 A1 WO 8705956A1
Authority
WO
WIPO (PCT)
Prior art keywords
boards
shaping
bending
heating
moistening
Prior art date
Application number
PCT/SE1987/000160
Other languages
English (en)
Inventor
Bengt Lindgren
Olle WAHLSTRÖM
Klaus Külper
Original Assignee
Hammarberg, Lars
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 Hammarberg, Lars filed Critical Hammarberg, Lars
Publication of WO1987005956A1 publication Critical patent/WO1987005956A1/fr
Priority to DK620887A priority Critical patent/DK620887D0/da

Links

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
    • D21J1/10—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27H—BENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
    • B27H1/00—Bending wood stock, e.g. boards
    • 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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/36—Moistening and heating webs to facilitate mechanical deformation and drying deformed webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B29K2711/126—Impregnated

Definitions

  • Method and apparatus _____ shaping preferably bending, hardened wood fibre boards
  • the present invention relates to a method of shaping, preferably bending, hardened flat fibre boards consist ⁇ ing of cellulose fibres, lignin and hardening oil by moistening, heating bending and subsequent cooling.
  • Hardened wood fibre boards which comprise short brittle cellulose fibres and intermediate lignin as well as a percentage of cured hardening oil, which is a drying oil having the task of forming a bridgehead for so-called hydrogen bridges, can be bent principly in two different ways, namely using a high temperature or a low temperature combined with moisture.
  • the fibre boards are normally hardened during the manufacturing process at about 165°C. If the temperature is raised a few degrees above 165°C, the board will self-ignite in the presence of oxygen. In such a case the fibres are over-hardened, the hydrogen bridges are broken down and a carbonising process begins, which leads to rapid lowering of the board strength. If the lignin is therefore to be softened up at about 200°C in order to bend the board, this should take place in the absence of oxygen and preferably in an autoclave where steam under pressure is present to ensure the reformation of the hydrogen bridges.
  • the board cannot be bent until it has been completely heated, which means that very hot contact plates ⁇ are required if this, is to take place rapidly with conventional heating, and so that the moisture will remain in the board.
  • the heat from these plates breaks down the surface fibres before the heat has reached the middle of the board, should it be desired to have the moisture remaining in the board. If heating is carried out more slowly and without th presence of moisture and oxygen, a complicated an expensive process is required where hydrogen gas or som other inert gas is continuously supplied.
  • the bendin process is thus dependent on the temperature of th board and the moisture content in the bending zones, energy quantity supplied during the bending preocess, remaining moisture content in the board and the rate o bending which is selected during the advance of th boards through the machine used for bending. All thes factors are then also mutually independent, for example, a board which is too cold and stiff cause:- the elec trodes used for the high-frequency heating to be force apart or the boards are ruptured. A too low moistur content results in turn in that the high-frequenc energy supplied becomes drastically less, giving temperature which is too low and thus a board which i too- stiff in the continued bending process, where th board continues to force apart the electrodes or i breaks up during advancing through the machine.
  • the object of the present invention is to achieve continuous method and and an apparatus for controlled bending of wood fibres boards of the kind mentioned i the introduction, where the above-mentioned drawbacks - have been eliminated.
  • the distinguishing features of the method and apparatus in accordance with the present invention are apparent from the accompanying claims.
  • the necessary moisture content inside the boards to enable bending them is obtained very rapidly by using a chemical solution for moistening.
  • pene ⁇ tration can be increased by about 100 times. Due to the high moisture content inside the bending zones achieved in this way, there is obtained a concentration of the supplied high-frequency energy simultaneously as such a high moisture content has ensured that the moisture is suffient during the whole of the bending operation during heating. This enables a continuous bending process in which the boards can be fed through the machine at a rate as high as 10-15 m per minute.
  • Fig. 1 schematically illustrates a machine, seen in plan, for the continuous bending of hardened wood fibre boards.
  • Fig. 2 is a schematic perspective view to an enlarged scale of two opposing shaping surfaces in the heating and shaping apparatus
  • Fig. 3 is a side view of the machine schematically illustrated in Fig. 1 and now shown in more detail.
  • flat fibre boards which are to be shaped, preferably by bending, and comprising celloluse fibres, lignin and hardening oil are fed from the right into the machine by a feeding apparatus 9.
  • the machine includes at least one conveyor 2 for continuously advancing the boards 1.
  • a brush means 7 for brushing the advancing boards 1 free from possible particles or for brushing t rough up the surface of the boards and remove wa substances to permit better penetration of moisture
  • the boards are the conveyed into a moistening apparatus 3 where the zone o zones of the boards 1 which are to be bent are moistene using the chemical solution, which is applied in suitable way, e.g.
  • this solution suitably contains surfactant and an alkali salt.
  • the surfactant i preferably of the alkyl sulphate type and the alkal salt is preferably of the sodium hydroxide type.
  • pair of shaping surfaces 8 are schematically illustrate in Fig. 2, and they extend along one or both sides o the conveyor 2 in the advancing direction of the board 1.
  • a cooling apparatus 5 is situated after the heatin and shaping apparatus 4, the boards being fixed as t their shape in the cooling apparatus while cooling.
  • Th shaping surfaces 8 in the heating and shaping apparatu 4 are suitably coated with a plastic material e.g Teflon which has low friction and low dielectic losses
  • the method in accordance with the present invention fo bending hardened wood fibre boards is carried out in th following manner.
  • the boards 1 are advanced, preferabl edge to edge after each other, from right to left a will be apparent from the drawing, and during conveyanc on conveyor 2 the boards 1 will first arrive at th brushing apparatus 7, where the boards are brushed clea in the beding zones. Subsequently the boards 1 come int the preheating unit 6 for heating up to about 30-90°C, preferably 60-80°C.
  • the boards are moistened with the chemical solution in the moistening apparatus 3 on their upper and/or lower faces over the zones which are to be bent, before the boards are fed into the heating and shaping apparatus 4, in which they are high-frequency heated at preferably 27 MHz to about 40-160°C, simultaneously as they are bent or moulded to the desired predetermined shape.
  • the boards are then retained during cooling in the cooling device 5. After this, the boards are ready for conveyance to storage or place of use.
  • the combination of alkyl sulphates and sodium hydroxide give several positive effects,- such as high penetration of the chemical solution into the boards, which is necessary for a continuous process.
  • the alkaline additive causes swelling of the cellulose fibres, which suck up water rapidly in combination with low surface tension provided by the alkyl sulphate.
  • the combination also achieves softening of the lignosulphonic acids in the boards in a similar way as for sulphate digestion.
  • the alkali is then neutralized by the acidic substances in the interior of the boards, the lignin hardens again after the bending process.
  • the combination furthermore results in a concentration of the high-frequency energy.
  • the boards with their bending zones well penetrated by the chemical solution in accordance with the invention, give a very high loss factor, i.e. the high-frequency energy is concentrated to the moistened zones.
  • the loss factor is doubled and the dielectrical constant increases, which indicates that the field is made more dense in the moistened area or areas on the boards.
  • the boards in the heating and shaping apparatus 4 they are fed continuously through the apparatus simultaneously as they are heated.
  • the boards preferably lie edge to edg after each other in the direction of travel, and are fe in between two shaping surfaces which are fixed i relation to the boards, and which also serve a electrodes for the high-frequency energy, the mutua spacing between the shaping surfaces being adjusted t the thickness of the boards which are to be bent.

Landscapes

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

Abstract

Le procédé et l'appareil ci-décrits servent au formage, en particulier au pliage, de panneaux plats en fibres de bois durcis comprenant des fibres de cellulose, de la lignine et une huile durcissante par humidification, chauffage, pliage puis refroidissement. Les panneaux (1) sont acheminés continuellement dans un appareil d'humidification, dans lequel ils sont humidifiés au fur et à mesure de leur avance par une solution chimique appliquée sur les faces supérieure et/ou inférieure des panneaux dans les zones où ils doivent être pliés, après quoi ils sont chauffés par de l'énergie à haute fréquence de préférence de 27 MHz à environ 40-160°C, en même temps qu'ils sont pliés ou moulés selon une forme prédéterminée désirée, forme dans laquelle les panneaux sont maintenus durant le refroidissement. Un appareil servant au pliage desdits panneaux (1) comprend au moins un transporteur (2) permettant l'avance continue desdits panneaux devant être pliés, ledit transporteur (2) comportant, dans la direction d'avancement des panneaux un appareil d'humidification (3) fournissant une quantité prédéterminée d'humidité aux faces supérieure et inférieure des panneaux, un appareil de chauffage et de formage (4) comprenant deux surfaces de formage (8), qui font office d'électrodes et entre lesquelles les panneaux peuvent être avancés durant le chauffage et le formage simultanés, et un appareil de refroidissement (5), dans lequel la forme des panneaux est maintenue durant le refroidissement.
PCT/SE1987/000160 1986-03-27 1987-03-27 Procede et appareil de formage, en particulier de pliage, de panneaux en fibres de bois durcis WO1987005956A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK620887A DK620887D0 (da) 1986-03-27 1987-11-26 Fremgangsmaade og apparatur til formning, fortrinsvis boejning, af haerdede traefiberplader

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8601454-5 1986-03-27
SE8601454A SE452037B (sv) 1986-03-27 1986-03-27 Forfarande och anordning for formning, foretredesvis bojning, av herdade trefiberskivor

Publications (1)

Publication Number Publication Date
WO1987005956A1 true WO1987005956A1 (fr) 1987-10-08

Family

ID=20364006

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000160 WO1987005956A1 (fr) 1986-03-27 1987-03-27 Procede et appareil de formage, en particulier de pliage, de panneaux en fibres de bois durcis

Country Status (5)

Country Link
EP (1) EP0301012A1 (fr)
JP (1) JPS63502910A (fr)
AU (1) AU7169587A (fr)
SE (1) SE452037B (fr)
WO (1) WO1987005956A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003262A1 (fr) * 1994-07-26 1996-02-08 Crosby Limited Procede de façonnage de materiaux de substitution du bois
EP0710532A1 (fr) * 1994-11-02 1996-05-08 Glunz Ag Méthode pour la fabrication des pièces de meubles avec une surface principale et un bord
WO1998011973A2 (fr) * 1996-09-16 1998-03-26 Zellform Gesellschaft M.B.H. Procede de production de pieces brutes ou de pieces moulees realisees en cellulose et/ou dans un materiau de fibreux renfermant de la cellulose
WO2002026456A2 (fr) * 2000-09-29 2002-04-04 Steinhoff Manufacturing (Pty) Ltd. Procede de manipulation de moulures en bois synthetique et produit utilise dans ce procede
GB2390336A (en) * 2002-07-03 2004-01-07 Kenneth David Waller Shaping manufactured board
US8597455B1 (en) 2009-10-02 2013-12-03 Metacomb, Inc. Translucent building material comprising corrugated cardboard

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595501A (en) * 1946-07-27 1952-05-06 Allis Chalmers Mfg Co Method of molding insulating material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595501A (en) * 1946-07-27 1952-05-06 Allis Chalmers Mfg Co Method of molding insulating material

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003262A1 (fr) * 1994-07-26 1996-02-08 Crosby Limited Procede de façonnage de materiaux de substitution du bois
EP0710532A1 (fr) * 1994-11-02 1996-05-08 Glunz Ag Méthode pour la fabrication des pièces de meubles avec une surface principale et un bord
US6379594B1 (en) 1996-09-16 2002-04-30 Zellform Gesellschaft M.B.H. Process for producing workpieces and molded pieces out of cellulose and/or cellulose-containing fiber material
WO1998011973A2 (fr) * 1996-09-16 1998-03-26 Zellform Gesellschaft M.B.H. Procede de production de pieces brutes ou de pieces moulees realisees en cellulose et/ou dans un materiau de fibreux renfermant de la cellulose
WO1998011973A3 (fr) * 1996-09-16 1998-06-25 Procede de production de pieces brutes ou de pieces moulees realisees en cellulose et/ou dans un materiau de fibreux renfermant de la cellulose
WO2002026456A3 (fr) * 2000-09-29 2002-05-16 Steinhoff Mfg Pty Ltd Procede de manipulation de moulures en bois synthetique et produit utilise dans ce procede
WO2002026456A2 (fr) * 2000-09-29 2002-04-04 Steinhoff Manufacturing (Pty) Ltd. Procede de manipulation de moulures en bois synthetique et produit utilise dans ce procede
GB2390336A (en) * 2002-07-03 2004-01-07 Kenneth David Waller Shaping manufactured board
GB2390336B (en) * 2002-07-03 2005-06-15 Kenneth David Waller Shaping manufactured board
US8597455B1 (en) 2009-10-02 2013-12-03 Metacomb, Inc. Translucent building material comprising corrugated cardboard
US9796153B1 (en) 2009-10-02 2017-10-24 Metacomb, Inc. Translucent building material comprising corrugated cardboard
US10434743B2 (en) 2009-10-02 2019-10-08 Metacomb, Inc. Translucent building material
US11472155B2 (en) 2009-10-02 2022-10-18 Metacomb, Inc. Translucent building material

Also Published As

Publication number Publication date
SE452037B (sv) 1987-11-09
EP0301012A1 (fr) 1989-02-01
SE8601454L (sv) 1987-09-28
JPS63502910A (ja) 1988-10-27
SE8601454D0 (sv) 1986-03-27
AU7169587A (en) 1987-10-20

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