EP2921293A1 - Presse à chaud pour plaques en bois - Google Patents

Presse à chaud pour plaques en bois Download PDF

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Publication number
EP2921293A1
EP2921293A1 EP14160360.5A EP14160360A EP2921293A1 EP 2921293 A1 EP2921293 A1 EP 2921293A1 EP 14160360 A EP14160360 A EP 14160360A EP 2921293 A1 EP2921293 A1 EP 2921293A1
Authority
EP
European Patent Office
Prior art keywords
wood
press
hot press
based panel
projection
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.)
Granted
Application number
EP14160360.5A
Other languages
German (de)
English (en)
Other versions
EP2921293B1 (fr
Inventor
Kai Tönse
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.)
Flooring Technologies Ltd
Original Assignee
Flooring Technologies 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 Flooring Technologies Ltd filed Critical Flooring Technologies Ltd
Priority to PT14160360T priority Critical patent/PT2921293T/pt
Priority to PL14160360T priority patent/PL2921293T3/pl
Priority to ES14160360T priority patent/ES2704847T3/es
Priority to EP14160360.5A priority patent/EP2921293B1/fr
Publication of EP2921293A1 publication Critical patent/EP2921293A1/fr
Application granted granted Critical
Publication of EP2921293B1 publication Critical patent/EP2921293B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • 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
    • B27N3/20—Moulding or pressing characterised by using platen-presses

Definitions

  • the invention relates to a wood-based panel hot press with a pressing element which has an edge and limits a press nip in which a wood-based panel blank to be pressed is arranged during operation.
  • the invention relates to a method for producing a wood-based panel, in particular a floor laminate.
  • the invention has for its object to increase the service life of pressing elements.
  • the invention solves the problem by a generic wood-based panel hot press, the pressing element adjacent to the edge has a projection which extends into the press nip.
  • the invention solves the problem by a method for producing a wood-based panel, in particular a floor laminate, in which a wood-based panel hot press according to the invention is used.
  • An advantage of the invention is that the service life of the pressing element can be significantly extended. Experiments have shown that the service life can at least be quadrupled.
  • Another advantage is that the significant increase in service life can be achieved by a technically simple means. Thus, the advantage of increased service life does not have to be paid for by expensive technical measures.
  • the invention is based on the finding that flow of the resin occurs during pressing. At the edge of the pressing element, a displacement of the molten resin to the side occurs in a conventional pressing element without a projection, so that the surface-distant, hard-containing layers come into contact with the pressing element. Since the press plate expands and contracts during pressing, there is a relative movement between the corundum grains and the press plate, which leads to the increased wear. Due to the surprisingly simple technical means of the peripheral edge a displacement of the resin is avoided at the edge of the pressing element and reduces the tendency to wear drastically. On the other hand, other attempts, such as increasing the layer thickness of the uppermost layer, which need not comprise any hard particles, surprisingly showed no influence on the pressing element service life.
  • the wood-based panel hot press is understood in particular to mean a press which is designed to heat the press element to a temperature of more than 150 °, in particular to at least 200 °.
  • the hot press comprises a heating device, in particular in the form of an electric heating device or a heating device operated by heated hydraulic oil.
  • the hot press is also designed to apply a pressure which is sufficiently high to press a synthetic resin, in particular a melamine resin, onto the wood-based board blank so as to form a floor laminate.
  • the pressing member adjacent to the edge has a projection
  • the pressing member at the position where it is in contact with the wooden material board blank during pressing and at which no protrusion is formed along a plane extends, wherein the projection protrudes out of this plane out into the press nip.
  • the projection is arranged adjacent to the edge, it is understood in particular that it is possible, but not necessary, that the projection merges with the inner edge. As a rule, it is favorable if the projection has a small distance from the edge. Since the projection leaves an impression in the resulting, refined wood-based panel, it is advantageous if the projection is arranged on an edge of the wood-based panel blank. In particular, a distance of the projection from the edge is less than a tenth of a minimum of the width and length of the pressing element.
  • the pressing element is made of steel. It is favorable if the pressing element is chrome-plated in order to increase the service life.
  • the projection has a height of at least 20 micrometers, in particular at least 50 micrometers.
  • the height is that extent of the projection about which the projection protrudes into the press nip. It is the surprising realization that even such a small projection can multiply the service life of the pressing element.
  • the protrusion has a height of at most 500 microns.
  • a greater height of the projection could lead to the pressing element not only influencing the resin layer during pressing, but also the wood-material layer, which is disadvantageous.
  • the pressing element is a press plate which extends along a pressing element plane.
  • the projection protrudes from the pressing element level.
  • the projection extends along a rectangle, within which the press plate extends along a pressing element plane.
  • the projection extends along the rectangle, it is understood, in particular, that a rectangle exists whose circumferential line is formed entirely or at least partially on the projection. It is particularly favorable if the projection extends completely along the circumferential line. However, it is also conceivable that the projection has interruptions. Generally, it is advantageous if the projection extends along a trapezoid. It is particularly favorable if the trapezoid is a rectangle, since then very easy-to-use wood-based panels are obtained.
  • the material plate hot press is preferably a discontinuously operating press, in particular a short-cycle press.
  • a short-cycle press is understood to mean a press whose pressing time is less than 20 seconds.
  • a wood-based panel manufacturing device which comprises, in addition to a wood-based panel hot press according to the invention at least one application device for applying a resin containing hartstoffpisme pasn.
  • the pressing element has a structuring with a structure depth, so that a relief-finished surface is produced on the wood-based material board blank.
  • the height of the protrusion is preferably at least 0.8 times a structural depth and / or at most three times the structural depth.
  • the height is between 100 and 200 microns.
  • the layer thickness can be up to 200 microns.
  • the structure depth is the difference between the lowest valley and the highest elevation of the structuring.
  • a wood-based panel hot press in the form of a short-cycle press is used, that is, a pressing time for pressing the wood-based panel blank is not more than 20 seconds.
  • a method of the invention comprises the steps of applying a first top resin layer comprising hard particles, particularly corundum particles, to a wood material layer, applying a second top resin layer containing cellulose to the first top resin layer, and applying a third top resin layer containing glass particles on the second upper resin layer, wherein the resin layers together have a layer thickness of at least 50 microns, especially 80 microns have.
  • a first top resin layer comprising hard particles, particularly corundum particles
  • an embossing is embossed in the wood material board blank by means of the pressing element, wherein the height is at least 0.8 times a structural depth and / or at most three times the structural depth.
  • the wood-based board blank is so pressed that the projection of the pressing element is disposed adjacent to a wood-based board edge of the wood-based panel blank.
  • a displacement of material of the resin layers is reduced to the wood-based panel edge.
  • FIG. 1a shows a wood-based panel hot press 10 according to the invention, comprising a frame 12, a pressing pressure generator 14 in the form of hydraulic cylinders, a pressing element holder 16 and a pressing member 18.
  • the pressing member 18 is fixed to the pressing element holder 16 and is heated by this to a predetermined pressing temperature, for example by means of a thermal oil, which is passed through heating channels.
  • the pressing pressure generator 14 is acted upon by a hydraulic unit with pressurized fluid, so that the pressing member 18 can exert a pressing pressure on a schematically drawn wood material board blank 20.
  • the wood-based panel blank 20 is arranged in a press nip 21, which is bounded above by the pressing element 18.
  • the projection 24 has a height h of 50 micrometers, which is measured relative to a pressing element plane E.
  • the wood-based panel hot press 10 is a short-cycle press that presses the wood-based panel blank 20 into a floor laminate within a cycle time of 7 seconds.
  • the pressing member 18 has a thickness d of 15 mm and is made of steel.
  • The, in particular all-round, projection may have different widths and be designed not only full-surface, but also structured.
  • the pressing element is for example a stainless steel press plate, for example, from the special tube 393 SQ.
  • the pressing element has a hardness of at least 60 HRC, at least on its surface. If the pressing element has a structuring, this preferably structure preferably has a minimum hardness of at least 60 HRC.
  • FIG. 1b shows a schematic view from below of the pressing member 18. It can be seen that the pressing member 18 has a width B and a length L, wherein the width B is greater than 4 m and for example 5 m and wherein the length L is greater than 1.5 m and for example 2.5 m.
  • the projection 24 has a distance from the edge 22, which is for example between 1 cm and 10 cm. The length and width, however, is variable by design.
  • FIG. 2 shows a schematic structure of a wood-based panel blank 20.
  • This comprises a wood-based material layer 26, a first upper resin layer 28 containing hard material particles 30 in the form of corundum particles.
  • a second upper resin layer 32 containing cellulose is applied on the first upper resin layer 28 .
  • a third upper resin layer 34 containing glass particles 36 is deposited on the second upper resin layer 32 .
  • the wood-based panel blank 20 also includes a lower resin layer 38 corresponding to the first upper resin layer 28 and applied below the wood material layer 26 thereon.
  • the pressing member 18 is located as it is arranged during pressing of the wood-based material board blank 20. It will be appreciated that the projection 24, when pressed, is positioned adjacent a wood-based panel edge 37 of the wood-based panel blank 20, thus preventing or at least reducing displacement of material of the resin layers 28, 32, 34 sideways.
  • FIG. 3 shows a section through a wood-based panel manufacturing device 39 according to the invention, which in addition to the wood-based panel hot press 10, an applicator 40, which is arranged in a processing direction V in front of the wood-based panel hot press 10.
  • the application device 40 comprises an upper applicator 58 and a lower applicator 60, each of which is designed as an order mills and each have an applicator roll 46 and a metering roller 48.
  • material supply lines 44 which are provided with an arrow at the end, mixed, applied hard material particles are introduced between the application roller 46 and the metering roller 48 in mixing containers.
  • the applicator roll 46 By the applicator roll 46, the hard particles are applied to the top or bottom of the wood-based panel blank 20.
  • the transport of the wood-based panel blank 20 is done both before and behind the applicator 40 by means of a pointed lug transport 50. Because this Spitzlaschen transport device 50 has few, small-area contact points with the wood-based board blank 20, a good quality of the wood-based panel is guaranteed.
  • the spiked transport device 50 includes pointed tabs 52 are cleaned by automatic cleaning brush 54.
  • 60 hold-down 56 can be arranged in front of and behind the respective application devices 58, 60. In this way, it is ensured that the layers on the top and bottom of the wood-based panel 2 can be reproducibly and precisely applied.
EP14160360.5A 2014-03-17 2014-03-17 Presse à chaud pour plaques en bois Active EP2921293B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PT14160360T PT2921293T (pt) 2014-03-17 2014-03-17 Prensa quente de painéis à base de madeira
PL14160360T PL2921293T3 (pl) 2014-03-17 2014-03-17 Prasa gorąca do płyt z tworzywa drzewnego
ES14160360T ES2704847T3 (es) 2014-03-17 2014-03-17 Prensa en caliente para tableros de material derivado de la madera
EP14160360.5A EP2921293B1 (fr) 2014-03-17 2014-03-17 Presse à chaud pour plaques en bois

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14160360.5A EP2921293B1 (fr) 2014-03-17 2014-03-17 Presse à chaud pour plaques en bois

Publications (2)

Publication Number Publication Date
EP2921293A1 true EP2921293A1 (fr) 2015-09-23
EP2921293B1 EP2921293B1 (fr) 2018-10-10

Family

ID=50289486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14160360.5A Active EP2921293B1 (fr) 2014-03-17 2014-03-17 Presse à chaud pour plaques en bois

Country Status (4)

Country Link
EP (1) EP2921293B1 (fr)
ES (1) ES2704847T3 (fr)
PL (1) PL2921293T3 (fr)
PT (1) PT2921293T (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3666514A1 (fr) 2018-12-12 2020-06-17 Flooring Technologies Ltd. Tôle embouti permettant de produire des structures plus profondes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675066A (en) * 1984-10-02 1987-06-23 Meinan Machinery Works, Inc. Method of bonding veneer sheets and apparatus therefor
DE19633289C1 (de) * 1996-08-19 1997-06-05 Hueck Engraving Gmbh Heißpresse zum Herstellen kunststoffbeschichteter Platten aus Preßlaminat oder Holzwerkstoffen
EP2338693A1 (fr) 2009-12-23 2011-06-29 Flooring Technologies Ltd. Procédé et dispositif destinés à l'affinement d'une plaque en matériau dérivé du bois

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675066A (en) * 1984-10-02 1987-06-23 Meinan Machinery Works, Inc. Method of bonding veneer sheets and apparatus therefor
DE19633289C1 (de) * 1996-08-19 1997-06-05 Hueck Engraving Gmbh Heißpresse zum Herstellen kunststoffbeschichteter Platten aus Preßlaminat oder Holzwerkstoffen
EP2338693A1 (fr) 2009-12-23 2011-06-29 Flooring Technologies Ltd. Procédé et dispositif destinés à l'affinement d'une plaque en matériau dérivé du bois

Also Published As

Publication number Publication date
ES2704847T3 (es) 2019-03-20
PL2921293T3 (pl) 2019-04-30
PT2921293T (pt) 2018-12-19
EP2921293B1 (fr) 2018-10-10

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