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EP1200236A1 - Procede et dispositif pour la fabrication de panneaux contenant de la lignocellulose - Google Patents

Procede et dispositif pour la fabrication de panneaux contenant de la lignocellulose

Info

Publication number
EP1200236A1
EP1200236A1 EP00931829A EP00931829A EP1200236A1 EP 1200236 A1 EP1200236 A1 EP 1200236A1 EP 00931829 A EP00931829 A EP 00931829A EP 00931829 A EP00931829 A EP 00931829A EP 1200236 A1 EP1200236 A1 EP 1200236A1
Authority
EP
European Patent Office
Prior art keywords
board
surface layer
press
arrangement
carrying
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.)
Withdrawn
Application number
EP00931829A
Other languages
German (de)
English (en)
Inventor
Göran Lundgren
Göran OSCARSSON
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.)
Valmet AB
Original Assignee
Valmet Fibertech AB
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 Valmet Fibertech AB filed Critical Valmet Fibertech AB
Publication of EP1200236A1 publication Critical patent/EP1200236A1/fr
Withdrawn legal-status Critical Current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
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • 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

Definitions

  • the present invention relates to a method of producing boards from ligno- cellulose-containing material, and to an arrangement for carrying out the method.
  • Methods of producing boards from lignocellulose-containing raw material are well known to the art and have found wide use in practice.
  • the manufacture of such boards usually includes the following main method steps: disintegration of the raw material into particles and/or fibres of appropriate size, drying the particles and/or fibres to a determined moisture quotient and glue-coating the material either prior to or subsequent to said drying process, shaping the glue-coated material to form a mat, which may comprise several layers, optionally cold-pressing the mat, preheating said mat, water-spraying mat surfaces, etc., and heat-pressing the mat in a discontinuous press or in a continuous press while subjecting the material simultaneously to pressure and heat so as to obtain a finished board.
  • the result will be a board with a sometimes thick surface layer with enhanced surface density.
  • the boards obtained by this method e.g. so-called MDF boards (Medium Density Fiberboard) are sometimes used in the production of doors, kitchen cup- board doors, and profiled structural elements such as skirting boards, cornices, window linings, architraving, or furniture components. These structural elements or products are often profiled or patterned, these profiles or patterns being provided in accordance with known technology by milling said profile or pattern in/on the finished board. This method has many drawbacks.
  • MDF boards Medium Density Fiberboard
  • the method involves a production chain and transport chain that consists of many cost-inducing intermediate steps and operations, and secondly results in a milled product that will normally have different densities in cross-section and therewith absorb different amounts of paint or varnish at different locations, and thirdly milling of the material also results in high material losses. For instance, more than 50% of the starting material can be lost when milling products to pronounced depths. Because the board has different densities in the two surface layers subsequent to being worked, the board tends to "warp" when subjected to naturally occurring variations in air humidity.
  • the known method will normally involve sanding and varnish- ing, normally with several layers of varnish, or the application of some type of film for priming and/or decorating purposes.
  • the object of the present invention is to address these problems. Accordingly, the invention relates to a novel method of avoiding the drawbacks associated with the present-day production process and the many intermediate steps, material transportation and other operations in an economic way.
  • the object of the invention is achieved with the method as defined in claim 1 and having the novel characteristic features set forth in the characterising clause of said claim.
  • the inventive method is characterized by subjecting a board between a first step, in which the shaped mat is compressed to a board that has an essentially uniform density, and a second step in which the board is pressed to a finished board, to an intermediate step in the form of at least one operation of machining by cutting in order to obtain a pattern on or in said board while retaining the generally uniform density of said board.
  • the present invention thus affords the advantage that the machining operation in which a pattern is cut on or in the board forms part of the production process as an intermediate step prior to finally pressing the board to a finished state. This avoids the expensive transportation and handling operations that are required when the corresponding operation is performed on a finished board.
  • the board shall have an essentially uniform density both before and after the machining operation, i.e. a so-called straight density profile, which means that the density shall be essentially the same across the full cross-section/thickness of the board.
  • the machining and patterning operation shall thus not result in any appreciable change in the density of the board.
  • the uniform and unaffected density also has the advantage of reducing the risk of the board warping, by virtue of the fact that the board will absorb moisture uniformly.
  • Pressing of the board in the second step of the process is carried out in a manner to retain the pattern obtained by the machining operation and may either be performed in a continuous press or in a batch-wise press, so-called discontinu- ous press, with hot rolls or press plates that include the intended pattern.
  • the boards is preferably machined in one or more milling operations. Other types of mechanical working of the board, however, are conceivable such as sanding or grinding, for instance. Naturally, a combination of several board machining or working operations may be applied. According to a first embodiment, the surface layer of the board is modified prior to the second process step but after the machining operation.
  • the surface layer of the board is modified in conjunction with the second step.
  • Modification of the surface layer of the board may include applying a pre- glued film to said board or placing a laminate on the board either before pressing the board in the second step or in conjunction therewith, for instance.
  • the film or laminate will then harden firmly to the board, to form a sealing and strengthening layer in the hot pressing operation.
  • a densified surface layer may be pro- Jerusalem art at high pressures and heat transfer at the beginning of the press cycle.
  • All embodiments may, of course, be mutually combined in different ways. All embodiments include the possibility of applying a further pattern to the board, such as to give the board a certain surface structure or texture, such as a grain structure or texture. Examples of methods of providing board with a densified surface layer or a sealing surface layer are described in the aforementioned Swedish patent publications.
  • the inventive method also has the advantage of enabling material that is cut away by milling or otherwise removed in the machining operation to be returned to the flow of raw material in the board manufacturing process.
  • the present invention also relates to a corresponding arrangement for carrying out the method, in accordance with claim 12, comprising an arrangement for carrying out the first step that includes a pre-press in which a mat is compressed to form a board of generally uniform density, and at least one station which includes a cutting machine for carrying out the intermediate step, and further comprising a press for carrying out the second step.
  • Figure 1 is a schematic illustration of plant and a board manufacturing method in accordance with a first embodiment of the present invention in respect of continuous pressing of the board;
  • Figs. 2a, 2b, 2c show examples of patterns obtained by means of the method and plant illustrated in Fig. 1 ;
  • Figure 3 illustrates plant and a method for producing boards in accordance with a second embodiment of the present invention with respect to pressing of the board in a discontinuous press;
  • Figs. 4a and 4b show examples of a pattern obtained by milling and stepwise pressing in a discontinuous press (Fig. 4a), and a cross-sectional view of the object in Fig. 4a where the milling operations are illustrated (Fig. 4b).
  • the process illustrated in Fig. 1 for the manufacture of boards from ligno- cellulose-containing material includes a first process stage in the form of a pre-press 1 , an intermediate stage that includes milling stations 2, and a second stage that includes a continuous press 3.
  • Stage one includes a belt press 1 , shown in side view, which includes typically drive rolls 6, stretch rolls 7, guide rolls 8 and an adjustable inlet part 9 that includes infeed rolls (not shown), steam roll 10, and a holding section 12 comprising compression roll and further rolls (not shown), and a surrounding wire 14, or alternatively a perforated steel belt with wire.
  • the mat 4 fed into the inlet section 9 is compressed to a predetermined density.
  • the glue hardens/cures in the mat in the holder section 12, such as to obtain board that has a uniform density profile.
  • the density of the board may be 150-900 kg/m 3 , preferably 500-700 kg/m 3 .
  • a higher density, in the order of 800-900 kg/m 3 is used in the manufacture of thin boards.
  • the holding section 12 is followed by a conditioning unit 16 in which steam and press gases are dealt with.
  • the compressed mat 4 is fed into board milling stations 2, in which the pattern desired, in the form of surface pat- terns, profiled strips or the like, are milled in the board.
  • the board is passed into a continuous press 3, which includes the second process stage.
  • the rolls 20 of this press have the same pattern as the milled pattern, so as to ensure that the milled pattern will not be destroyed as the board is pressed.
  • a sealing surface layer can be obtained on the board beneficially in this way.
  • the surface layer of the board can be further reinforced by applying a pre-glued film or a laminate to the machined board prior to the board entering the second press stage. This alternative is illustrated in Fig. 1 with a laminate feed mill 22.
  • the rolls may have a surface temperature of about between 100 and 300°C, preferably between 150 and 250°C.
  • Figs. 2a-2c illustrate respective examples of different patterns that can be obtained with the aid of the milling stations in a continuous board pressing proc- ess.
  • Figs. 2a and 2b show respective examples of patterns transversely to the longitudinal axis of the board, while Fig. 2c shows an example of a pattern formed in the longitudinal direction of said board.
  • Fig. 3 is concerned with the manufacture of boards in accordance with the present invention, wherein the second stage is comprised of a discontinuous press in which boards that have been cut to length are pressed batch-wise. Stage 1 is not illustrated in Fig. 3, but may be carried out in the manner illustrated in Fig.
  • the mat 34 compressed to form a board in the first stage is delivered after said stage to a saw 30 that saws the board into board parts of a size suitable for the discontinuous press.
  • the boards are transported to a milling station 32 in which the desired pattern or patterns are milled on the board.
  • respective boards are advanced to the discontinuous press 33 and fed thereinto for batch-wise pressing.
  • an surface layer reinforcing laminate is applied to the board prior to said pressing operation.
  • the laminate is delivered from a laminate feed mill 52.
  • the discontinuous press has press plates that include the intended pattern, i.e.
  • the board may be given a further pattern, for instance in the form of a surface structure.
  • the press plates will preferably have a surface temperature that lies within the same range as that men- tioned with respect to the rolls in the first embodiment illustrated in Fig. 1.
  • Fig. 4a shows an example of a pattern obtained in the plant illustrated in Fig. 3.
  • the object illustrated may be the door of a kitchen cupboard or cabinet, or a door of some other kind.
  • the door 60 is shown in cross-section in Fig. 4b and in an enlarged view taken on the line A-A in Fig. 4a.
  • a bevelled surface has been milled on the door around its perimeter edge.
  • the door has also been provided with a grooved profile 62 spaced from said outer edge.

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)

Abstract

La présente invention se rapporte à un procédé de fabrication de panneaux à partir d'une matière contenant de la lignocellulose, qui est désintégrée en particules et/ou fibres, puis séchée, enduite de colle et enfin façonnée sous forme de mat (4). Le mat formé au cours d'une première étape (1) est comprimé de manière à former un panneau présentant généralement une densité uniforme, puis il est pressé au cours d'une seconde étape (3; 33) et transformé en panneau fini. Conformément audit procédé, le panneau est soumis entre la première et la seconde étape à une étape intermédiaire (2; 32) consistant au moins en une opération d'usinage par coupe et visant à l'obtention d'un motif formé sur ou dans ledit panneau, la densité généralement uniforme du panneau étant conservée au cours de cette étape intermédiaire. L'invention se rapporte également à un dispositif de mise en oeuvre dudit procédé.
EP00931829A 1999-05-11 2000-05-11 Procede et dispositif pour la fabrication de panneaux contenant de la lignocellulose Withdrawn EP1200236A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9901717 1999-05-11
SE9901717A SE514103C2 (sv) 1999-05-11 1999-05-11 Förfarande och anordning vid framställning av lignocellulosahaltiga skivor
PCT/SE2000/000940 WO2000067972A1 (fr) 1999-05-11 2000-05-11 Procede et dispositif pour la fabrication de panneaux contenant de la lignocellulose

Publications (1)

Publication Number Publication Date
EP1200236A1 true EP1200236A1 (fr) 2002-05-02

Family

ID=20415557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00931829A Withdrawn EP1200236A1 (fr) 1999-05-11 2000-05-11 Procede et dispositif pour la fabrication de panneaux contenant de la lignocellulose

Country Status (12)

Country Link
EP (1) EP1200236A1 (fr)
JP (1) JP2002544000A (fr)
KR (1) KR20020010637A (fr)
CN (1) CN1105627C (fr)
AU (1) AU4964700A (fr)
CA (1) CA2368091A1 (fr)
CZ (1) CZ20013991A3 (fr)
NO (1) NO20015460D0 (fr)
NZ (1) NZ515438A (fr)
PL (1) PL351644A1 (fr)
SE (1) SE514103C2 (fr)
WO (1) WO2000067972A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441190A (zh) * 2014-11-04 2015-03-25 浙江红高梁木业有限公司 一种新型复合纤维板材料及其制备新方法及用途

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2406677C (fr) 2000-04-20 2008-07-15 Masonite Corporation Panneau moule sur son envers
US7426806B2 (en) 2000-04-20 2008-09-23 Masonite Corporation Reverse molded panel, method of manufacture, and door manufactured therefrom
US7021015B2 (en) 2000-04-20 2006-04-04 Masonite Corporation Reverse molded plant-on panel component, method of manufacture, and method of decorating a door therewith
US6866740B2 (en) * 2001-11-28 2005-03-15 Masonite Corporation Method of manufacturing contoured consolidated cellulosic panels with variable basis weight
JP2004025448A (ja) * 2002-06-21 2004-01-29 Heian Corp 治具レス加工装置
EP1789243B1 (fr) * 2004-06-15 2014-03-05 John S. Fujii Formage a sec de bandes de fibres de bois tridimensionnelles
CA2721390C (fr) 2008-10-21 2012-04-03 Uniboard Canada Inc. Panneaux de particules monocouches gaufres et procedes de preparation associes
DE102016011847A1 (de) * 2016-10-01 2018-04-05 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren und Anlage zur Herstellung von Werkstoffplatten
CN106827163B (zh) * 2016-12-27 2018-10-12 重庆良能机械有限公司 一种椰棕床垫加工设备
KR200493372Y1 (ko) 2019-03-21 2021-03-18 박상권 화물용 아대 집게

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502272C2 (sv) * 1994-01-28 1995-09-25 Sunds Defibrator Ind Ab Förfarande för framställning av lignocellulosahaltiga skivor
SE504221C2 (sv) * 1995-04-07 1996-12-09 Sunds Defibrator Ind Ab Förfarande för framställning av lignocellulosahaltiga skivor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0067972A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441190A (zh) * 2014-11-04 2015-03-25 浙江红高梁木业有限公司 一种新型复合纤维板材料及其制备新方法及用途

Also Published As

Publication number Publication date
KR20020010637A (ko) 2002-02-04
WO2000067972A1 (fr) 2000-11-16
JP2002544000A (ja) 2002-12-24
PL351644A1 (en) 2003-05-19
NO20015460L (no) 2001-11-08
SE9901717L (sv) 2000-11-12
SE514103C2 (sv) 2001-01-08
AU4964700A (en) 2000-11-21
CA2368091A1 (fr) 2000-11-16
CN1349449A (zh) 2002-05-15
SE9901717D0 (sv) 1999-05-11
NO20015460D0 (no) 2001-11-08
NZ515438A (en) 2003-02-28
CZ20013991A3 (cs) 2002-04-17
CN1105627C (zh) 2003-04-16

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