EP0820371B1 - Procede et dispositif de production continue de plaques de particules contenant de la lignocellulose - Google Patents

Procede et dispositif de production continue de plaques de particules contenant de la lignocellulose Download PDF

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Publication number
EP0820371B1
EP0820371B1 EP97902338A EP97902338A EP0820371B1 EP 0820371 B1 EP0820371 B1 EP 0820371B1 EP 97902338 A EP97902338 A EP 97902338A EP 97902338 A EP97902338 A EP 97902338A EP 0820371 B1 EP0820371 B1 EP 0820371B1
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EP
European Patent Office
Prior art keywords
mat
press
continuously
heating
panels
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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
EP97902338A
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German (de)
English (en)
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EP0820371A1 (fr
Inventor
Jürgen Dr. Kramer
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Individual
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    • 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
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/65—Processes of preheating prior to molding

Definitions

  • the invention relates to a method for producing Sheets of particles containing lignocellulose, with binders is continuously applied to the particles, the Particles are continuously formed into a mat, the Mat is continuously pre-compacted, the mat being continuous by exposure to a high-frequency high-voltage field is warmed up and being guided in one plane is pressed under further heat to the plates.
  • the invention relates to a device for Implementation of such a method with a gluing machine for the continuous application of binder on the Particles, with a mat former for continuous shaping of the Particles into a mat, with a pre-press for continuous Pre-compact the mat with an HF heater for continuous heating of the mat by the action of a high-frequency high-voltage field and with a hot press for Pressing the between two press plates in one plane guided mat under further heat to the plates.
  • the invention thus relates only to methods and devices which at least including the prepress and the HF heating work completely continuously, which means until then no intermittent facilities for Come into play.
  • the invention relates only to methods and corresponding devices in which the in one plane guided mat is pressed hot to the plates. This closes the use of so-called calender presses, with which only Slabs of small thickness and made from certain materials are.
  • the invention is not limited to a specific binder or a certain size and composition of the Lignocellulosic particles restricted. That is, it comes does not depend on whether the binder is for example a urea resin or a formaldehyde-free binder is. Nor is it decisive whether the manufactured boards around chipboard, MDF boards or OSB boards is. However, the invention is in the making certain plates with special advantages.
  • the heating power of an HF heater depends on the field strength of the effective alternating field. This means that to achieve the same heating output with double electrode spacing twice the AC voltage must be used. Size However, tensions are always with the special danger of Breakthroughs connected, causing serious damage to the HF heater being able to lead. In addition, those with the punctures accompanying electro-magnetic impulses also others damage electrical or electronic equipment. Ultimately, it can be in the manufacture of panels by the Breakthroughs also for igniting the mat or for damage come on the finished panels.
  • RF heaters are also found in batch work Plants for the production of boards made from lignocellulose Particle use.
  • HF heating of the mat known in hot pressing in a stack press. Because stack presses with HF heating are technically very complex and the efficiency of the HF heating is limited, the economy applies of hot presses with HF heating as not given.
  • the invention has for its object the use of an HF heater in the continuous manufacture of panels Optimize lignocellulose-containing material.
  • this object is achieved in a method of Type described above solved in that the mat at continuous pre-compression by exposure to the high-frequency High voltage field is warmed.
  • the RF heater can have minimal electrode spacing, so that only a minimal AC voltage is used. That way not just the risk of breakdowns and the associated Reduces interference, but it also goes from the HF heating outgoing electromagnetic stray radiation. Basically, it is only a comparatively minor technical one Expenses for the HF heating to operate, since this only must be designed for comparatively low voltages.
  • Lignocellulose-containing material can clearly show their capacity be increased. This requires the integration of the HF heating no additional space in the pre-press, it is included comparatively low technical effort can be realized.
  • the high-frequency high-voltage field of the HF heater preferably acts on the mat where it has its smallest thickness reached during pre-compression.
  • the HF heating can be implemented.
  • Heating the mat in the has a special advantage Pre-press using a high-frequency high-voltage field in the production of OSB panels from flat Pieces of wood.
  • Thin OSB boards are due to the large Restoring forces of the flat pieces of wood used so far cannot be produced commercially continuously because the press belts would be too heavily loaded by continuous hot presses.
  • the HF heating in the pre-press becomes the lignin in the Plasticized mat and the binders already start to show adhesive properties, so that the restoring forces of the flat pieces of wood decrease sharply.
  • the result is a very little rebound of the mat after the pre-press observed and the mat can also be in a continuous working hot press to be pressed to the OSB boards.
  • the slight cracking of the mat after the pre-press is general a special feature of the method according to the invention.
  • the electrodes of the HF heating on the backs of the plates that act on both sides Press belts of the pre-press can be arranged.
  • the Electrodes of the HF heater are preferably arranged where the Press belts have their smallest distance from each other.
  • One electrode of the RF heater can be grounded, which is the grounded electrode on the other side of the mat opposite Press belt is designed to be radio frequency resistant. If an electrode of an HF heater is grounded an asymmetrical RF feed.
  • the grounded Electrode also called a cold electrode. In the area of this cold electrode, the material stresses are less than on the "hot" electrode. It is therefore sufficient to convert one existing device for the production of plates from lignocellulose-containing Material if at least the press belt Prepress, which is assigned to the hot electrode, see above is converted that it is radio frequency resistant.
  • binder is first used in a gluing machine 1 continuously on lignocellulose-containing Particle 2 applied. Then be the particles 2 in a mat former 3 continuously into one Mat 4 shaped. In a pre-press 5, the mat 4 continuously pre-compressed. At the same time acts in the pre-press 5 an RF heater for continuous heating by a high-frequency high-voltage field on the mat 4. The warmed up and pre-compacted mat 4 is then in a hot press 6 continuously pressed into a plate 7, which then in individual plates can be cut.
  • the gluing machine used in the new process is known in its construction.
  • the pre-press has a special structure 5, whose inner structure is shown schematically in FIG. 2 is.
  • the inlet thickness 27 of the mat 4 is in the pre-press between two rollers 8 and 9 rotating press belts 10 and 11 reduced to a thickness of 12. Behind the press belts 10 and 11 the mat 4 jumps again to an outlet thickness 13 on.
  • An HF heater is located in the area of the minimum thickness 12 of the mat 4 14 arranged. A possible location for one second HF heater 14 is indicated by a dashed line.
  • the existing HF heater 14 has two behind each the press belts 10 and 11 arranged electrodes 15 and 16.
  • the electrode 16 is grounded, so that the HF heating after Principle of asymmetrical feeding works. Accordingly the electrode 16 is also called the cold electrode and the electrode 15 referred to as the hot electrode. Because the RF heater 14 in Area of minimum thickness 12 acts on the mat 4 is sufficient a comparatively low voltage to the for the desired energy transfer to the mat 4 required To achieve field strength. This also eliminates the risk of Breakthroughs kept within narrow limits.
  • At least the press belt 10 of the pre-press 5 is designed to be radio frequency resistant. At which the cold electrode 16 associated press belt 11, this is not absolutely necessary, but also recommended.
  • the hot press 6 outlined in FIG. 3 has the usual structure a continuously operating hot press, in which the Mat 4 between endless on rollers 17 and 18 supporting Press plates 19 and 20 is guided and under the action of heat is pressed to the plate 7.
  • the corresponding Heating elements are not shown in Figure 3.
  • the vertical distance between the press plates 19 and 20 is about Length of a hot press is not constant, as in FIG. 4 can be seen in the for a discontinuous hot press this distance as the thickness d of the plate 4 in its path s through the hot press 6 is applied.
  • Via a first section 21 the mat 4 is compressed, thereby heating the Cover layers of the mat 4 by the press plates 19 and 20th excess contact heat.
  • the thickness of the plate d becomes somewhat larger kept constant, the contact heat of the press plates 19 and 20 penetrates into the middle of the plate.
  • the temperature curve in the middle of the plate is Plate 4 in the hot press 6 for two examples of the invention Process and for two comparative examples over the absolute pressing time t.
  • the empty triangles and the empty diamonds correspond to MDF boards with a nominal thickness of 16 or 30 mm, according to the invention using an HF heater 14 were produced in the pre-press 5.
  • the filled squares and the filled circles correspond to comparative examples, where MDF boards with a nominal thickness of 16 or 30 mm without using the HF heater 14 were.
  • mats preheated to 50 ° C for 16 mm plates the temperature in the middle of the plate rises fairly quickly and reaches 80 ° C after only 60 seconds, d. H.
  • the temperature penetration curves according to FIG. 5 belong to the following examples:
  • MDF boards with a nominal thickness of 16 mm were produced once with and once without heating the mats in the pre-press using a high-frequency high-voltage field: Species 100% softwood approx. 90 - 95% pine and 5 to 10% spruce original shape wood chips binder Urea resin (Leuna 5554) Beleimungsart blowline Rohdicke 17.8 / 17.5 mm Dick shrinkage approx. 0.3 mm after cooling density 770 kg per cubic meter solid resin 10% on atro fibers Harder without addition of hardener humidity approx. 8 - 10% Mattentemp. without HF about 30 ° C ' Mattentemp. with HF approx. 50 ° C Heating times without HF 10 s / mm Heating times with HF 7.5 - 5.5 s / mm pressing temperature 227 ° C (hot plates)
  • the transverse tensile strengths achieved were evaluated after EMB standard, with each measuring point in that shown in Figure 6 Diagram represents an average of 5 transverse tensile tests per plate.
  • Figure 6 are the right over the heating time of 10 s / mm Cross tensile strengths shown, which are without HF heating Heating of the mat resulted.
  • On the left over the The heating time range from 5.5 - 7.5 s / mm are the transverse tensile strengths reproduced with HF heating.
  • the heating time range from 7 to 7.5 s / mm, which corresponds to a heating time reduction of 25 to 30%, the strength level with HF heating is significantly higher than the values without HF heating.
  • the spreading areas are also significantly lower compared to the initial values without HF heating.
  • the strength level is slightly lower but still above the Initial values without HF heating. With a heating time of 5.5 s / mm the strength level is approx. 20% compared to the initial values dropped, but is still above the EMB standard.
  • MDF boards with a nominal thickness of 30 mm were produced under the following conditions: Species 100% softwood approx. 90 - 95% pine and 5 - 10% spruce original shape wood chips binder Urea resin (BASF 570 / NESTE 36 75) nominal thickness 30 mm Rohdicke 32.0 / 32.6 mm Dick shrinkage approx. 0.6 mm after cooling density 750 kg per cubic meter solid resin 12% on atro fibers Harder without addition of hardener humidity approx. 10% Mattentemp. without HF approx. 30 ° C Mattentemp. with HF approx. 50 ° C Heating times without HF 13 s / mm Heating times with HF 11 to 8 s / mm pressing temperature 227 ° C (hot plates)
  • the HF heating which was used in the examples according to the invention, has the following technical data: RF power output 15 kW at 100% duty cycle frequency 27.12 MHz + - 0.6% mains connection 400 V three-phase current + 6% - 10% 50 Hz control voltage 230 V / 50 Hz Power consumption at full load 32 kVA High voltage rectification silicon diodes transmitting tube - Make: ABB - Type: IQL 12-1 electrode plate - Length: 500 mm - Width: 800 mm

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  • 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)

Claims (8)

  1. Procédé pour la fabrication de panneaux en particules lignocellulosiques, selon lequel des agents liants sont appliqués en continu sur les particules, ces dernières sont moulées en continu pour former un mat, celui-ci est précompacté en continu entre des bandes circulaires, chauffé en continu sous l'effet d'un champ haute tension à haute fréquence lors de ce précompactage et ce mat, acheminé sur un plan, est comprimé sous un autre effet thermique pour former les panneaux, caractérisé en ce qu'après le précompactage du mat (4), ce champ haute tension à haute fréquence agit sur une épaisseur (12) la plus faible qui est inférieure à l'épaisseur de sortie (13) que reprend le mat (4) après le précompactage, et en ce que le mat (4) est maintenu essentiellement à l'épaisseur (12) la plus faible entre les bandes pressantes (10, 11) lorsqu'il est sous l'effet du champ haute tension à haute fréquence.
  2. Procédé selon la revendication 1 caractérisé en ce que le mat (4) est chauffé à une température inférieure à 60 °C, notamment comprise entre 45 et 55 °C.
  3. Procédé selon l'une des revendications 1 ou 2 caractérisé en ce que les panneaux (7) formés par compression du mat (4) présentent une épaisseur comprise entre 12 et 22 mm.
  4. Procédé selon l'une des revendications 1 ou 3 caractérisé en ce que les particules (2) sont des morceaux de bois plans à partir desquels on fabrique en continu des panneaux OSB.
  5. Dispositif pour la fabrication de panneaux de particules lignocellulosiques avec une encolleuse pour l'application en continu d'agents liants sur les particules, un mouleur de mats pour mouler en continu les particules de sorte à former un mat, une presse de préformage pour un précompactage continu du mat, un chauffage H.F. pour un réchauffement continu du mat sous effet d'un champ haute tension à haute fréquence et une presse à chaud pour la compression en panneaux, sous un autre effet thermique, du mat guidé sur un plan entre deux plaques de pressage, caractérisé en ce qu'à l'intérieur de la presse de préformage (5), le chauffage H.F. (14) est disposé en un endroit où le mat (4) est précompacté à une épaisseur la plus faible (12).
  6. Dispositif selon la revendication 5 caractérisé en ce que des électrodes (15, 16) du chauffage H.F. (14) sont disposées sur les parties arrières des bandes pressantes (10, 11) de la presse de préformage (5) agissant bilatéralement sur le mat (4).
  7. Dispositif se la revendication 6 caractérisé en ce que les électrodes (15, 16) du chauffage H.F : (14) sont disposées à l'endroit où l'intervalle entre les bandes pressantes (10, 11) est le plus faible.
  8. Dispositif selon la revendication 6 ou 7 caractérisé en ce qu'une électrode (16) du chauffage H.F. (14) est mise à la terre et que la bande pressante (10) située du côté du mat (4) opposé à cette électrode reliée à la terre (16) présente une configuration résistante aux hautes fréquences.
EP97902338A 1996-02-08 1997-02-06 Procede et dispositif de production continue de plaques de particules contenant de la lignocellulose Expired - Lifetime EP0820371B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19604574A DE19604574A1 (de) 1996-02-08 1996-02-08 Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Platten aus Lignocellulose-haltigen Teilchen
DE19604574 1996-02-08
PCT/EP1997/000529 WO1997028936A1 (fr) 1996-02-08 1997-02-06 Procede et dispositif de production continue de plaques de particules contenant de la lignocellulose

Publications (2)

Publication Number Publication Date
EP0820371A1 EP0820371A1 (fr) 1998-01-28
EP0820371B1 true EP0820371B1 (fr) 2002-06-12

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EP97902338A Expired - Lifetime EP0820371B1 (fr) 1996-02-08 1997-02-06 Procede et dispositif de production continue de plaques de particules contenant de la lignocellulose

Country Status (7)

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US (1) US5913990A (fr)
EP (1) EP0820371B1 (fr)
AT (1) ATE218956T1 (fr)
AU (1) AU1601597A (fr)
CA (1) CA2217654A1 (fr)
DE (2) DE19604574A1 (fr)
WO (1) WO1997028936A1 (fr)

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US20050156348A1 (en) * 2000-10-06 2005-07-21 Randall James W. Method and apparatus for making building panels having low edge thickness swelling
US20030090022A1 (en) * 2000-10-06 2003-05-15 James Randall Method and apparatus for making building panels having low edge thickness swelling
US6572804B2 (en) 2000-10-18 2003-06-03 Borden Chemical, Inc. Method for making building panels having low edge thickness swelling
DE10106815A1 (de) * 2001-02-14 2002-08-29 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
CN100335253C (zh) * 2001-05-03 2007-09-05 克隆纳斯板技术有限公司 降低刨花板的甲醛含量和甲醛释放量的方法
US20020189740A1 (en) * 2001-06-19 2002-12-19 Carter Neil A. Methods and systems for making high density fiberboards from low density fibrous media
US7141195B2 (en) * 2003-09-05 2006-11-28 Weyerhaeuser Co. Process for making engineered lignocellulosic-based panels
US20050054807A1 (en) * 2003-09-05 2005-03-10 Weyerhaeuser Company Low-nitrogen content phenol-formaldehyde resin
US7258761B2 (en) * 2004-11-12 2007-08-21 Huber Engineered Woods Llc Multi-step preheating processes for manufacturing wood based composites
US20060128886A1 (en) * 2004-12-14 2006-06-15 Winterowd Jack G Low-nitrogen content phenol-formaldehyde resin
US8414720B2 (en) 2010-06-21 2013-04-09 Weyerhaeuser Nr Company Systems and methods for manufacturing composite wood products to reduce bowing
DE102011003318B4 (de) 2010-10-07 2016-06-23 Institut Für Holztechnologie Dresden Gemeinnützige Gmbh Faserplatten mit funktionsorientiertem Rohdichteprofil und Verfahren zu deren Herstellung
JP6127901B2 (ja) * 2013-10-21 2017-05-17 セイコーエプソン株式会社 シート製造装置、シート製造方法
WO2015104349A2 (fr) 2014-01-13 2015-07-16 Basf Se Procédé servant à fabriquer des matériaux à base de lignocellulose
ES2727141T3 (es) 2014-12-09 2019-10-14 Basf Se Procedimiento para producir materiales lignocelulósicos multicapa con un núcleo y al menos una capa de revestimiento superior e inferior y características especiales del núcleo
EP3230028B1 (fr) 2014-12-09 2019-01-09 Basf Se Procédé de fabrication d'un matériau en lignocellulose mono-couche ou multicouches par durcissement dans un champ électrique haute fréquence
EP3274143B1 (fr) 2015-03-27 2019-08-28 Basf Se Procédé destiné à la fabrication de matières dérivées du bois
EP3274144A1 (fr) 2015-03-27 2018-01-31 Basf Se Procédé de production de matières lignocellulosiques monocouches ou multicouches à l'aide de trialkylphosphate
JP6311749B2 (ja) * 2016-07-13 2018-04-18 セイコーエプソン株式会社 シート製造装置、シート製造方法
LT3515990T (lt) 2016-09-23 2020-10-26 Basf Se Lignoceliuliozės ruošinių gamybos būdas
JP6330931B2 (ja) * 2017-02-03 2018-05-30 セイコーエプソン株式会社 シート製造装置、シート製造方法
UA127480C2 (uk) 2017-08-23 2023-09-06 Басф Се Спосіб отримання лігноцелюлозних матеріалів в присутності капролактаму та олігомерів капролактаму
AT525180B1 (de) 2017-08-23 2023-01-15 Basf Se Verfahren zur Herstellung von Lignocellulosewerkstoffen mittels Bestimmung von NCO-Werten
WO2019115261A1 (fr) 2017-12-13 2019-06-20 Basf Se Procédé de production de matières lignocellulosiques monocouches ou multicouches dans des conditions spéciales sous presse chaude

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Also Published As

Publication number Publication date
DE19604574A1 (de) 1997-09-18
WO1997028936A1 (fr) 1997-08-14
CA2217654A1 (fr) 1997-08-14
DE59707471D1 (de) 2002-07-18
AU1601597A (en) 1997-08-28
ATE218956T1 (de) 2002-06-15
EP0820371A1 (fr) 1998-01-28
US5913990A (en) 1999-06-22

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