EP2807006A1 - Procédé de fabrication d'une pièce moulée en matériau dérivé du bois - Google Patents

Procédé de fabrication d'une pièce moulée en matériau dérivé du bois

Info

Publication number
EP2807006A1
EP2807006A1 EP13706717.9A EP13706717A EP2807006A1 EP 2807006 A1 EP2807006 A1 EP 2807006A1 EP 13706717 A EP13706717 A EP 13706717A EP 2807006 A1 EP2807006 A1 EP 2807006A1
Authority
EP
European Patent Office
Prior art keywords
pressing
press
pressure
wood
air pressure
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Withdrawn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
EP13706717.9A
Other languages
German (de)
English (en)
Inventor
Kurt Nonninger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2807006A1 publication Critical patent/EP2807006A1/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Withdrawn legal-status Critical Current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
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
    • 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 invention relates to a method for producing a wood material molding using a
  • Bindeffens a heat transfer into the wood material molding in the form of a DampfStoßes occurs.
  • the duration of the pressing time is primarily influenced by how fast the binder hardens
  • Example of a three-layer wood-based panel which consists of a middle layer, an upper and a lower cover layer, the solutions known from the prior art are described below.
  • a three-layer constructed wood material mat consisting of the wood material base material and a thermosetting binder, fed to a press. Subsequently, a H disclosepreßvorgang takes place.
  • the curing of the binder (glue) in the outer cover layers by direct heat through heated press plates or bands. Due to the heat energy introduced into the plate on the one hand and the moisture in the plate on the other hand, a water vapor pressure gradient is formed in the plate.
  • the heat energy required for curing the middle layer is in the plate via the so-called steam pulse
  • the outer press plates are heated, for example, to 0 ° Celsius.
  • the water glue water
  • the boiling point 100 ° C
  • This steam shoots vertically from both sides of the plate towards the center of the plate due to the water vapor pressure drop. This process is called steam shock.
  • the temperature difference is for example 75 ° C
  • the vapor condenses in the still cool middle layer. It releases heat of condensation, which raises the temperature in the middle layer.
  • the chemical curing reactions in the middle layer are faster and it takes less time for the binder to harden, resulting in a shorter press time.
  • This steam jet principle is used in the production of numerous wood-based molded parts, for example in the production of chipboard, MDF, OSB, etc.
  • a provided for the production of such a wood-based molded part press is characterized by a compression chamber and a device for generating an overpressure such that are increased before the heat transfer in the form of a burst of steam prevailing in the press room process air pressure relative to the prevailing outside of the baling chamber atmospheric air pressure can, without however beyond the Holzwerkstoff- molded part moisture, especially in the form of water vapor, supply.
  • DE 1 2008 026 258 achieves that the boiling point of the water is increased beyond 10 ° C. This has the consequence that with a shot of steam at e.g. 1 ° C significantly more heat energy can be introduced into the middle layer of the wood-based molding. This increased amount of heat that is released in the condensation of the water vapor in the still cold middle layer leads to a much higher temperature in the middle layer compared to the conventional steam injection technique, with the result that the curing reactions of the glue run much faster. In summary, with the technique described in DE 1 2008 026 258, the steam blast takes place at a higher temperature, which leads to a shortening of the pressing time.
  • An object of the present invention is to provide a technique for producing a wood-based molded article with the aid of which the pressing time can be shortened even further.
  • the core of the present invention is that during pressing a targeted reduction of the process air pressure to initiate the DampfStoßes occurs.
  • a targeted reduction of the process air pressure to initiate the DampfStoßes occurs.
  • Press according to the invention provided with a pressure relief device, so that during the pressing of the process air pressure targeted, even alternately lowered.
  • a targeted pressure relief during the pressing a sudden heating of the material, whereby timing and flow of the heating can be influenced.
  • the present invention is based on the basic findings described in DE 1 2008 026 258, as described below:
  • the invention described in DE 1 2008 026 258 is based on the consideration of the reaction rate Increase the curing reactions of the binder in that with an equal amount of water vapor we transfer more heat energy. This allows a high process temperature can be achieved without the disadvantages of increased internal pressure.
  • the resulting water vapor is the moisture content of the air, the
  • the press room in particular in the form of the press nip, is designed to achieve the desired overpressure as a substantially closed pressure chamber.
  • a Druckhunt- is provided which surrounds other parts of the press in addition to the actual pressing chamber.
  • the press has a pressure chamber completely surrounding it; the entire press is then inside the pressure chamber.
  • press described in DE 1 2008 026 258 has suitable technical facilities for this purpose, which are familiar to the person skilled in the art and therefore need not be listed here in detail.
  • devices for sealing the press nip are provided, for example, laterally mounted sealing rings, pressure devices, etc.
  • discontinuously operating presses for example
  • a device for generating an overpressure is to be provided. It may be an overpressure container that provides an overpressure of, for example, 0.5 to 1 bar. For this an overpressure can be fed into the pressure chamber via pressure lines.
  • the boiling point of the water may be at e.g. 11 ° C to 0 ° C are set.
  • the present invention proposes to maintain the principle of steam blast under increased pressure, but the time of To influence steam. In other words, there is no spontaneous burst of steam anymore. Instead, the timing of the steam blast is controlled specifically. The steam burst is in other words initiated. In the following, therefore, is also spoken by a "forced steam blast.” In other words, by a skillful control of the pressure gradients during the pressing operation a steam ewegung (steam shot) forced within the mat.
  • a basic idea of the present invention thus lies in an additional relief step, namely one
  • a significant advantage of the present invention is that by deliberately forcing the steam blast the time of DampfStoßes, d. 11.
  • the time at which the energy is sent to the middle layer of the mat can be optimally selected. As a result, this leads to a further shortening of the pressing time.
  • Optimum timing of the burst of steam means that the time of depressurization is chosen so that the remaining time left by the web in the press is just enough to cure the wood-base molding, i. to stabilize the chemical bonds at least so far that the wood-base molding does not burst (delaminate) when the press is opened.
  • forcing the steam pulse through an influenceable pressure relief means that the strength of the steam pulse can be influenced in a targeted manner.
  • the manner in which the depressurization is carried out can influence the speed with which the steam jet flows in the direction of the middle layer. This can be regulated by a defined lowering of the process pressure. If, for example, the process air pressure is spontaneously reduced to 1 bar, the steam pulse will be vehement. If the pressure is reduced within a period of, for example, a few seconds, this is due to the structure of the
  • a pressure control is provided by means of which the sealing device can be influenced so that the pressure in the press room can be selectively changed.
  • the present method can also be used in the production of numerous wood-based molded parts, for example in the production of chipboard, MDF, HDF, OSB, etc.
  • the wood-based molded parts may be Single parts or to act continuously running through the press Endlosteil.
  • the method can be used both on discontinuous, as well as on continuously operating presses, for example on single or multi-day presses, double belt presses, etc.
  • urea, melamine or phenolic resins or mixtures thereof or mixtures of these resins with polymeric diisocyanates (PMDI) are known as thermosetting binders.
  • binders such as tannin and / or lignin resins are used.
  • Fig. 2 is an illustration of the present invention based on a continuously operating press.
  • the chips thus produced are dried until final moisture in the range of 0.5 - 2% are reached. Subsequently, the chips are fractionated, ie divided into sieve fractions. Thereafter, the separate gluing of the so-called. Cover and middle layer chips with thermosetting resins, especially urea, melamine or phenolic resins or mixtures thereof or with polymeric diisocyanates (PMDI) or with natural binders such as tannin and / or lignin. After cutting, drying
  • Chipboard thickness occurs with simultaneous curing of the thermosetting binder.
  • a discontinuous Amsterdamtagenpresse 1 is shown by way of example, the press plates 2 has.
  • the chemical reactivities of the binders used in the top and middle layer must be matched to the requirements of the compression reactions.
  • the moisture balance of the chipboard just emerging must be sized so that an optimal curing reaction in the top and middle layer can be done and the chipboard 3 is not in the moment when they leave the press 1 and the external pressing pressure thus eliminated, by too high delaminated internal vapor pressure, ie bursts.
  • the duration of the pressing time is primarily influenced by how fast the binder hardens.
  • the chip mat 4 is fed to the press 1, whose press nip
  • the press nip 5 is designed as a pressure chamber.
  • the press nip 5 is connected via pressure lines 6 with a pressure vessel 7, with the help of the introduction of the chip mat 4 and the
  • the pressing time can be significantly shortened or the feed rate of the press 1 can be significantly increased without the risk that the particle board 3 delaminated when extending from the press 1.
  • the burst of steam is not spontaneous, but is initiated by the fact that a pressure relief valve 8 is opened before the end of the pressing time.
  • the press is a continuous (floor) press 1 with a rotating press belt 12, comprising a top and a bottom band.
  • the press width is for example 2.20 m.
  • the large-volume fleece in the form of a first example, 0 to 120 mm thick chip mat 4 of the press 10 takes place during the so-called "pre-pressing" initially a compression.
  • the mat 4 is doing by the press mouth to its final thickness of For example, 22 mm compressed.
  • the Preßbackentemperatur during the "pre-pressing” is for example 250 ° C.
  • the press 10 The press nip 5 in turn serves as a pressure chamber.
  • the press nip 5 can be sealed by means of a simple pressure seal or pressure seal.
  • Such a sealing device is, for example, a circumferential, segmented pressure chain 19 or a circulating pressure band which seals one side of the press 10.
  • a print chain 19 consists of juxtaposed links.
  • the print chain 19 or the print tape sets in both the upper band, as well as on the lower band and presses between the bands against the lateral narrow surfaces of the mat 4.
  • the print chain 19 and the print tape consists for example of a temperature-stable hard rubber material.
  • the compression of the mat 4 already effected by the "prepressing" is used. It may even be necessary while
  • the sealing devices 19 extend on both sides of the press 10 in the direction of the press exit. However, they do not reach the end of the press 10, but end before. This determines the time of the pressure release.
  • the speed of the press can be increased by 15% or more.
  • the press 10 It may be provided initially to operate the press 10 normally until the desired feed rate is reached, z. B. 4 seconds per millimeter plate thickness. If this is the case, the seal according to the invention, for example in the form of the pressure chains 19, "switched" using the appropriate pressure control. The exact positions at which the print chains 19 are applied or removed may vary depending on the press equipment and operating conditions. Preferably, the press 10 is designed such that a variable positioning of the sealing device is possible. Is the sealing device
  • the feed rate can be increased, for example, to 3 seconds per millimeter plate thickness.
  • it is preferably provided to form the print chain 19 in a segmented manner.
  • This segmentation of the print chain 19 is therefore advantageously not only designed so that it allows a deflection of the print chain and thus a comparatively simple handling. Rather, a corresponding design of the pressure chain 19 also allows a locally variable application and lifting of the chain.
  • the sealing device is preferably designed such that both the point on the side of the press 10, on which the sealing device is applied, a seal thus begins, as well as the point at which the sealing device is removed again, thus canceling the sealing is variable, in particular, is freely selectable.

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)

Abstract

L'invention concerne un procédé de fabrication d'une pièce moulée en matériau dérivé du bois au moyen d'un matériau de base dérivé du bois et d'un liant thermodurcissable par moulage par compression, un transfert de chaleur sous forme de jet de vapeur étant projeté dans la pièce moulée en matériau dérivé du bois pour durcir le liant. L'invention vise à raccourcir le temps de compression. A cet effet, la pression d'air de processus régnant dans la chambre de compression avant le transfert de chaleur sous forme d'un jet de vapeur est augmentée par rapport à la pression d'air atmosphérique régnant à l'extérieur de la chambre de compression. Un relâchement ciblé de la pression pendant le temps de compression permet de faire pénétrer brusquement la chaleur à l'intérieur du matériau, le moment et le déroulement de ce réchauffement pouvant être influencés.
EP13706717.9A 2012-01-25 2013-01-22 Procédé de fabrication d'une pièce moulée en matériau dérivé du bois Withdrawn EP2807006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012001292 2012-01-25
PCT/IB2013/000069 WO2013110992A1 (fr) 2012-01-25 2013-01-22 Procédé de fabrication d'une pièce moulée en matériau dérivé du bois

Publications (1)

Publication Number Publication Date
EP2807006A1 true EP2807006A1 (fr) 2014-12-03

Family

ID=47754886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13706717.9A Withdrawn EP2807006A1 (fr) 2012-01-25 2013-01-22 Procédé de fabrication d'une pièce moulée en matériau dérivé du bois

Country Status (3)

Country Link
EP (1) EP2807006A1 (fr)
DE (1) DE202013012197U1 (fr)
WO (1) WO2013110992A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113899127B (zh) * 2021-11-04 2022-11-18 江苏瑞泰人造板有限公司 一种刨花板冷却、调湿双处理结构和具有该结构的加工装置及方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1075140A (fr) * 1976-09-23 1980-04-08 Donald W. Nyberg Appareil pour la fabrication de panneaux d'agglomeres
DE3233241A1 (de) * 1981-10-13 1983-04-28 Günter Hans 1000 Berlin Kiss Verfahren zum pressen von formteilen aus bindemittelhaltigen organischen fasermatten und vorrichtung zur durchfuehrung des verfahrens
DE10361837B4 (de) * 2003-10-10 2009-09-03 Walter, Karl, Dr. Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Platten, Balken, Profilen oder ähnlichem aus Matten von Spänen und/oder Fasern
DE102008026258A1 (de) 2008-06-02 2009-12-03 Pfleiderer Ag Verfahren zur Herstellung eines Holzwerksoff-Formteiles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013110992A1 *

Also Published As

Publication number Publication date
DE202013012197U1 (de) 2016-01-12
WO2013110992A1 (fr) 2013-08-01

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