EP0172930B1 - Procédé et dispositif pour la fabrication de panneaux de particules de bois - Google Patents

Procédé et dispositif pour la fabrication de panneaux de particules de bois Download PDF

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Publication number
EP0172930B1
EP0172930B1 EP84110158A EP84110158A EP0172930B1 EP 0172930 B1 EP0172930 B1 EP 0172930B1 EP 84110158 A EP84110158 A EP 84110158A EP 84110158 A EP84110158 A EP 84110158A EP 0172930 B1 EP0172930 B1 EP 0172930B1
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EP
European Patent Office
Prior art keywords
steam
compression
period
during
stage
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.)
Expired
Application number
EP84110158A
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German (de)
English (en)
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EP0172930A1 (fr
Inventor
Michael N. Taylor
Timothy H. Reid
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Weyerhaeuser Co
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Weyerhaeuser Co
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Publication date
Priority to US06/599,599 priority Critical patent/US4517147A/en
Application filed by Weyerhaeuser Co filed Critical Weyerhaeuser Co
Priority to AT84110158T priority patent/ATE38177T1/de
Priority to EP84110158A priority patent/EP0172930B1/fr
Publication of EP0172930A1 publication Critical patent/EP0172930A1/fr
Application granted granted Critical
Publication of EP0172930B1 publication Critical patent/EP0172930B1/fr
Expired legal-status Critical Current

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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
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat

Definitions

  • the invention relates generically to a method for producing a wood-based board from a pressed material mat, which is made of chip and / or fiber material and a hardenable binder, e.g. a synthetic resin binder, by pressing over a predetermined pressing time divided into several sections and curing using water vapor between heated press plates of a plate press, which press plate is a device for supplying water vapor from a steam generator and on the pressing material side, a multiplicity of steam openings distributed over the pressing surface from which the water vapor can escape, the pressed material mat being introduced between the press plate and the press plates then being brought together in a first pre-compression pressing time period into a pre-compression position, with pre-compression of the pressed material mat, after which the water vapor during a damping time period through the steam openings of both press plates in the material to be pressed is introduced, the press plates being further compressed in a wood compaction in a final compression time period with further compression of the material to be pressed end plate thickness-defining end position
  • the invention further relates to a system for carrying out such a method with a plate press with two steaming press plates, steam generator, device for supplying the steam to the steaming press plates, which is equipped with valves, press control device for precise control of the closing movement the vaporization press plates with a defined precompression position and final compression position and vaporization control device for supplying the water vapor, the vaporization press plates having a large number of vapor openings distributed over the press plates on the side of the material to be pressed.
  • steam distributor screens can be arranged between the steam openings and the material to be pressed and / or that the press plates also have porous, e.g.
  • sintered, end plates can be provided, which allow steam to escape in a fine distribution. In any case, regular precautions are taken to ensure that high-energy steam jets that destroy the pressed material mats do not escape from the steam openings.
  • the pressed material mats can be scattered loosely or have already undergone preparatory compaction, which does not affect the precompaction belonging to the invention.
  • the known generic method (DE-PS 1276912, Weyer Reifen) works with a uniform, uninterrupted damping period and introduces superheated water vapor into the mat. This water vapor emerges from the edges of the mat. The plasticized material is thereby plasticized. Then the further supply of water vapor and thus the damping period are ended. The plasticized material to be pressed is subjected to final compression without further supply of water vapor when the press plates are moved together into their end position and cured in this state between the press plates held in the end position. Then the plate press is opened again.
  • the uninterrupted damping time span thus extends over various compression states of the pressed material mat, which is subjected to vapor deposition in a pre-compressed and uncompressed manner. Since saturated water vapor is used, condensation can form very easily. The finished wood-based panels are therefore often reduced by nests adversely affected quality, which are based on the fact that either air pockets remain in the pressed material or condensation has occurred.
  • the invention has for its object to carry out the generic method so that wood-based panels with nests of reduced quality can no longer arise, at the same time whether you are working with superheated or with saturated steam.
  • the invention is further based on the object of specifying a system with which the method according to the invention can be carried out simply and reliably. This system is defined in claim 11.
  • the invention teaches according to claim 1 in terms of the method that the damping period is interrupted by a rinsing / pressing period in which the water vapor emerges from the steam openings of the one press plate, flows through the pre-compressed material mat in the thickness direction and via the steam openings of the other, is removed from the pressurized steam plate, that the press plates are then moved to the end position and the water vapor supply to the final compressed material mat is continued via the steam openings of both press plates for the rest of the damping period and that during the last press period the pressed material mat is then carried out over at least one of the two press plates and their steam openings are exposed to the action of a vacuum and thereby dried, for which purpose the device for supplying the steam instead of to a steam generator it is connected to a vacuum source.
  • the mat to be pressed is filled with the water vapor, as it were. until saturation.
  • the invention is based on the knowledge that the shortcomings of the known generic procedure are based on the fact that the water vapor during the vapor deposition of the pre-compressed or end-compressed pressed material mat is removed exclusively via its edge. In this way, small or larger air pockets in the pressed material cannot be avoided, which can be found in the finished wood-based panel as nests of reduced quality.
  • condensate once it has formed, can at least not be evaporated and removed again to a sufficient extent. This also creates nests of reduced quality in the finished wood-based panel. All of this is particularly true when it comes to pressed material mats, the composition of which allows water vapor to flow through, but not easily flow through.
  • any air is carried out of the pressed material mat without difficulty during the rinsing pressing period by intensive cross-rinsing of the pre-compressed pressed material mat in the thickness direction and consequently a quality impairment based on air pockets is eliminated.
  • condensate forms as part of the measures according to the invention, this is also removed after the water vapor supply has been switched off, or water vapor that is formed from this condensate by post-evaporation is transported away reliably by transverse transport in the thickness direction of the pressed material mat or the wood-based panel formed from it that the pressed material mat or the wood-based panel that is being formed is exposed to the effect of the negative pressure.
  • the action of the negative pressure can easily be set up correspondingly long because of the last pressing period. The result ensures that high-quality wood-based panels are created, the quality of which is not impaired by uncured nests.
  • the method according to the invention can be further developed and also optimized in various ways.
  • the press plates are slowly moved further together on the pressed material mat during the first section of the damping period and during the rinsing press period.
  • wood-based panels can be achieved whose surfaces easily meet all quality requirements.
  • the steam supply can be continued continuously through the steam openings of both press plates even during the final compression press period. It is advisable to connect the pressed material mat to the atmosphere via both press plates and their steam openings during a relaxation period before being exposed to the negative pressure in the last pressing period.
  • a preferred embodiment of the invention is characterized in that the final compressed material mat is treated with water vapor of a vapor pressure which is higher than the vapor pressure of the water vapor with which the pre-compressed material mat has been treated during the remainder of the damping period.
  • a preferred embodiment of the invention which is characterized by simplicity and functional reliability and stability of the process control, is characterized in that condensable water vapor is used and that the water vapor during the first section of the damping period and during the Rinsing / pressing time in the pre-compressed material to be condensed and the temperature in the material to be pressed is thereby homogeneously adjusted to a temperature of about 100 to 135 ° C.
  • the system shown in Figs. 1 and 2 consists in its basic structure of a plate press with two steaming press plates 1, 2, a steam generator 3, a device 4 for supplying the steam to the steaming press plates 1, 2, which device 4 is equipped with valves 5, a press plate control device 6 for a positionally precise control of the closing movement of the steaming press plates 1, 2 with pre-sealing position V and final compression position E and a steaming control device 7 for the supply of the water vapor.
  • the steaming press plates 1, 2 have a large number of steam openings 8, 9 on the pressing material mat side. These steam openings 8, 9 can be covered by a fine-meshed sieve made of metal or plastic, which has not been shown.
  • a section of a pressed material mat 10 to be compressed was indicated in FIG. 1.
  • the steaming press plates 1, 2 are heated via special heating channels 11, which have been indicated in FIG. 2.
  • the heating medium which flows through these heating channels 11 cannot escape from the steam openings 8, 9.
  • the steam which emerges from the steam openings 8, 9 is introduced into the central steam duct 12, from which distribution ducts 13 extend, into which the steam openings 8 and 9, in turn, open.
  • the pressed material mat 10 is made of chip and / or fiber material and a binder, according to the method according to the invention, a high-quality wood-based panel is produced from such a pressed material mat 10, namely by pressing the pressed material mat 10 over a predetermined pressing time t and divided into several sections Cure using water vapor. This happens between the heated steaming press plates 1, 2.
  • the pressed material mat 10 is introduced between the steaming press plates 1, 2, and the steaming press plates 1, 2 are then moved together with partial compression of the pressed material mat 10 in a first pre-compression pressing period t o t, into a pre-compression position V, after which the water vapor during a damping time period t l t 4 through the steam openings 8, 9 of both steaming press plates 1, into the pressed material mat 10 and, furthermore, in a final compression pressing time period t 3 t x the steaming press plates 1, 2 with further compression of the pressed material mat 10 are moved together into a final compression position E which defines the thickness of the wood-based panel and the pressed material mat 10 is cured in this final compression position E of the vaporization press plate 1 in a pressing time period t 5 t 6 without further steam supply. It goes without saying that a period t 6 t 7 follows in which the negative pressure is released so that the plate press can be opened.
  • FIG. 3 In this graphical representation, the time, in seconds, is plotted as the abscissa.
  • the left ordinate in FIG. 3 shows the steam pressure in bar, the right one shows the distance between the upper steaming press plate 1 and the lower one.
  • the solid curve K in the figure shows the distance of the upper evaporation press plate 1 from the lower evaporation press plate 2 in millimeters.
  • the dashed curve K 2 shows the steam pressure in the lower vaporization press plate 2 in bar.
  • the dash-dotted curve K 3 shows the steam pressure in the upper steam press plate 1 in bar.
  • the steaming press plates 1, 2 are moved into the final compression position E and the water vapor supply to the final compressed material mat 10 via the steam openings 8, 9 of both steaming press plates 1, 2 for the rest of the steaming period t 1 t 4 continued.
  • the pressed material mat 10 is exposed to the action of a negative pressure via both steaming press plates 1, 2 and their steam openings 8, 9, and is thereby dried, for which purpose the device 4 for supplying the steam (instead of to a steam generator) is connected to a vacuum source 14.
  • the damping period t i t 4 is interrupted in this way by the rinsing / pressing period t 2 t 3 in two sections t, t 2 and t 3 t 4 .
  • the first section t 1 t 2 of the damping period t 1 t 4 defines a time in which the pre-compressed material mat 10 is treated with the water vapor.
  • the second section t 3 t 4 of the damping period t 1 t 4 defines a time in which the final compressed material mat 10 is treated with the water vapor, the steam supply also taking place during the final compression pressing period t 3 t x , which in this respect is the second section of the Damping period t 3 t 4 is to be attributed.
  • condensable for example slightly overheated, steam is used.
  • the process is carried out in such a way that the condensable water vapor condenses in the pressed material mat 10 during the first section t 1 t 2 of the damping time period t 1 t 4 and during the rinsing / pressing time section t 2 t 3 , the temperature in the pressed material mat 10 being very high due to the condensation is homogeneously adjusted to about 100 to 135 ° C. It is then expedient to work with superheated and therefore non-condensing steam.
  • the device 4 for supplying the water vapor has a branch line 15 which is connected to both steaming press plates 1, 2 via outlet valves 16 can be connected, the branch line 15 via a branching valve arrangement 17 during the rinsing pressing period t 2 t 3 for a steaming press plate 1 and during the relaxation pressing period t 4 t 5 for both press plates 1, 2 to the surrounding atmosphere and during the last one Pressing period t 5 t 6 for both vaporization press plates 1, 2 can be connected to a vacuum source 14.
  • the press plate control device 6 and the evaporation control device 7 are coupled.
  • the arrangement is such that the vapor deposition control device 7 also controls the steam supply during the rinsing pressing period t 2 t 3 and the relaxation during the relaxation pressing period t 4 t 5 and the vacuum treatment during the pressing period t 5 t 6 .
  • the press plate control device 6 supplies control signals to the vaporization control device 7, which vaporization control device 7 performs the specified steam supply measures during the first section t, t 2 of the damping period t, t 4 and in the rest t 3 t 4 of the damping period tt4.
  • the arrangement is such that the press plate control device 6 and the evaporation control device 7 can be controlled between the precompression position V and the final compression position E and, if appropriate, thereafter by a program.
  • FIG. 3 The graphical representation of FIG. 3 relates in detail to the production of special wood-based panels from pressed material mats 10 specially constructed for this purpose. These are pressed material mats or wood-based material panels of the structure specified in claim 7. For these pressed material mats 10 and thus for the production of the specified wood-based panels, as can be seen in FIG.
  • the damping time period t i t 4 is set to a maximum of two thirds of the pressing time t; the first section t 1 t 2 of attenuation time length t 1 t 4 is to the start of flushing Press time interval t 2 t 3, less than 10 seconds, preferably about 5 seconds, the rest of the attenuation time length is tt4 shorter than the difference of the attenuation time length t i t 4 minus the first section t 1 t 2 of the damping period t, t 4 .
  • the data in the table relate to the production of a chipboard with a conventional chip material and urea-formaldehyde glue, namely 8 and 9% by weight, moisture of the raw mat about 8% by weight.
  • the bulk density was 390 kg / m 3.
  • the values P 1 , P 2 , P 3 and P 4 indicate the distances of the press plate in millimeters, Sp 1 , Sp 2 , S P3 and Sp 4 the vapor pressures in bar. In the middle of the table you can find the time spans in seconds. On the left is the final density of the finished board.

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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)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (16)

1. Procédé pour fabriquer un panneau formé d'un matériau dérivé du bois et constitué par un mat (10) formé par un matériau pressé, qui est constitué à partir d'un matériau en forme de copeaux et/ou de fibres et d'un liant durcissable, par exemple un liant formé d'une résine synthétique, par pressage pendant un intervalle de temps prédéterminé de pressage, subdivisé en plusieurs intervalles de temps de pressage, et durcissement au moyen de vapeur d'eau entre des plateaux de presse chauffés (1,2) d'une presse à plateaux, ces plateaux de presse (1, 2) comportant un dispositif (4) servant à amener la vapeur d'eau d'un générateur de vapeur d'eau (3), ainsi que, sur la face tournée vers le mat formé d'un matériau pressé, une multiplicité d'ouvertures (8, 9) de passage de la vapeur, qui sont réparties dans la presse et d'où peut sortir la vapeur d'eau, et selon lequel on insère les mats (10) formés d'un matériau pressé entre les plateaux de presse (1,2) et on rapproche ensuite les plateaux de presse (1, 2) tout en réalisant une prédensification des mats (10) formés d'un matériau pressé, au cours d'un premier intervalle de temps (t0t1) de pressage avec mise en oeuvre d'une prédensification, jusque dans une position de prédensification, et selon lequel ensuite on introduit la vapeur d'eau pendant un intervalle de temps (tlt4) de production de vapeur dans les mats (10) formés d'un matériau pressé, à travers les ouvertures (8, 9) de passage de la vapeur, que comportent les deux plateaux de presse (1,2), et selon lequel en outre au cours d'un intervalle de temps (t3tx), de pressage avec mise en oeuvre de la densification finale, on rapproche les plateaux de presse (1, 2) en réalisant une compression supplémentaire du mat (10) formé d'un matériau pressé, en les amenant dans une position finale définissant l'épaisseur du panneau formé d'un matériau dérivé du bois, et on fait durcir le mat (10) formé d'un matériau pressé, ayant subi la densification finale, alors que les plateaux de presse (1, 2) sont dans cette position finale, pendant un autre intervalle de temps (t5t6) de pressage sans apport supplémentaire de vapeur d'eau, caractérisé en ce qu'on interrompt l'intervalle de temps (tlt4) de production de vapeur par un intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation, lors duquel la vapeur d'eau sort des ouvertures (9) de passage de la vapeur, que comporte l'un des plateaux de presse (2), traverse le mat (10) formé d'un matériau pressé prédensifié, dans la direction de son épaisseur et est évacuée par les ouvertures (8) de passage de la vapeur, que comporte l'autre plateau de presse (1) déconnecté de la source de vapeur d'eau (3), qu'ensuite on amène les plateaux de presse (1, 2) dans la position finale et on poursuit l'envoi de vapeur d'eau au mat (10) formé d'un matériau pressé, qui a subi sa densification finale, par l'intermédiaire des ouvertures (8, 9) de passage de la vapeur, que comportent les deux plateaux de presse (1, 2), pendant le reste de l'intervalle de temps (tlt4) de production de vapeur, et qu'ensuite, pendant le dernier intervalle de temps (t5t8) de pressage, on soumet le mat (10) formé d'un matériau de pressage, par l'intermédiaire d'au moins l'un des deux plateaux de pressage (1, 2) et de ses ouvertures (8, 9) de passage de la vapeur, à l'action d'une dépression et qu'on le sèche de cette manière, opération pour laquelle le dispositif (4) d'amenée de la vapeur d'eau est raccordé à une source de dépression (à la place d'un générateur de vapeur d'eau).
2. Procédé selon la revendication 1, caractérisé en ce qu'on rapproche lentement les plateaux de presse (1, 2) pendant la première partie de l'intervalle de temps (tlt4) de production de vapeur et pendant l'intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation, en les maintenant en contact contre le mat (10) formé d'un matériau de pressage.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'envoi de vapeur d'eau par l'intermédiaire des ouvertures (8,9) de passage de la vapeur, que comportent les deux plateaux de presse (1, 2), est poursuivi d'une façon continue pendant l'intervalle de temps (t3tx) de pressage avec mise en oeuvre de la densification finale.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on raccorde le mat (10) formé d'un matériau de pressage à l'atmosphère par l'intermédiaire des deux plateaux de presse (1,2) et de leurs ouvertures (8, 9) de passage de la vapeur, pendant un intervalle de temps (t4t5) de pressage avec mise en oeuvre d'une détente, avant de le soumettre, pendant le dernier intervalle de temps (t5t6) de pressage, à l'action de la dépression.
5. Procédé selon l'une des revendications 1 à 4, caractérisé par le fait qu'on traite le mat (10) formé d'un matériau de pressage, ayant subi la densification finale, pendant le reste de l'intervalle de temps (tlt4) de production de vapeur, avec de la vapeur d'eau dont la pression est supérieure à celle de la vapeur d'eau qui est appliquée pendant la première partie (t1t2) de l'intervalle de temps (t1t4) de production de vapeur.
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'on travaille avec de la vapeur d'eau condensable et qu'on amène la vapeur d'eau à se condenser dans le mat (10) formé d'un matériau pressé, pendant la première partie (tlt2) de l'intervalle de temps (t1t4) de production de vapeur ainsi que pendant l'intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation et que de ce fait la température du mat (10) formé d'un matériau de pressage est réglée entre environ 100 et 135°C.
7. Procédé selon l'une des revendications 1 à 6, dans sa forme de mise en oeuvre pour la fabrication de panneaux formés d'un matériau dérivé du bois, sous la forme de panneaux d'agglomérés ou de panneaux de fibres moyennant l'utilisation d'une colle d'urée-formaldéhyde, avec une humidité d'environ 8% de la masse de matière première et une densité apparente d'environ 390 kg/m3, caractérisé en ce qu'on travaille avec une durée de pressage d'environ 20 à 50 secondes, que l'intervalle de temps (t1t4) de production de vapeur est réglé au maximum aux deux tiers du temps de pressage, que la première partie (tlt2) de l'intervalle de temps (tlt4) de production de vapeur jusqu'au début de l'intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation est inférieure à 10 secondes et de préférence est égale à environ 5 secondes, que le reste de l'intervalle de temps (t1t4) de production de vapeur est inférieur à la différence entre l'intervalle de temps (tlt4) de production de vapeur et la première partie (t1t2) de l'intervalle de temps de production de vapeur, et que l'intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation possède une durée inférieure à 5 secondes et de préférence égale à environ 2 secondes.
8. Procédé selon la revendication 7, caractérisé en ce que l'intervalle de temps (tgtx) avec mise en forme de la densification finale forme le reste de l'intervalle de temps de production de vapeur.
9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce qu'on travaille avec une vapeur d'eau qui possède une température comprise entre 110 et 175°C.
10. Procédé suivant l'une des revendications 7 à 9, caractérisé en ce que la vapeur d'eau est envoyée pendant la première partie (t1t2) de l'intervalle de temps (tlt4) de production de vapeur au mat (10) formé d'un matériau pressé prédensifié, à une pression comprise entre 1,5 et 3,0 bars et est envoyée pendant le reste de l'intervalle de temps (t1t4) de production de vapeur au mat (10) formé d'un matériau pressé, ayant subi la densification finale, avec une pression comprise entre 3 et 9 bars, en fonction du type du liant.
11. Installation pour la mise en oeuvre du procédé selon l'une des revendications 1 à 10, comportant une presse à plateaux comportant deux plateaux de presse à vapeur (1, 2), un générateur de vapeur d'eau (3), un dispositif (4) servant à envoyer la vapeur d'eau aux plateaux de presse à vapeur (1, 2) et équipé de vannes (5), un dispositif (6) de commande des plateaux de presse permettant de commander, d'une manière précise en position, le déplacement de fermeture des plateaux de presse à vapeur (1, 2) pour les amener dans une position définie (3) de densification, et un dispositif (7) de réglage d'application de vapeur pour l'envoi de la vapeur d'eau, et dans lequel les plateaux de presse à vapeur (1, 2) comportent, sur leurs faces tournées vers le mat formé d'un matériau pressé, une multiplicité d'ouvertures (8, 9) de passage de la vapeur, réparties sur la surface de pressage, caractérisée par le fait que le dispositif (4) comporte, pour l'amenée de la vapeur d'eau, une conduite de dérivation (15), qui peut être raccordée par l'intermédiaire de soupapes de sortie (18), aux deux plateaux de presse à vapeur (1, 2), et que la conduite de dérivation (15) peut être raccordée par l'intermédiaire d'un dispositif (17) formant vanne de dérivation, à l'atmosphère environnante pendant un intervalle (t2t3) de pressage avec mise en oeuvre d'une circulation pour un plateau de presse à vapeur (1) et pendant un intervalle de temps (t4t5) de pressage avec mise en oeuvre d'une détente pour les deux plateaux de presse à vapeur (1, 2), ainsi qu'à une source de dépression (14) pendant un dernier intervalle de temps de pressage (t5t8) pour les deux plateaux de presse à vapeur (1, 2).
12. Installation selon la revendication 11, caractérisée en ce que le dispositif (6) de commande des plateaux de presse ainsi que le dispositif (7) de réglage de production de vapeur sont accouplés entre eux.
13. Installation selon l'une des revendications 11 ou 12, caractérisée en ce que le dispositif (7) de réglage de production de vapeur commande également la production de vapeur pendant l'intervalle de temps (t2t3) de pressage avec mise en oeuvre d'une circulation ainsi que le traitement avec une dépression pendant le dernier intervalle de temps de pressage (t5t6).
14. Installation selon l'une des revendications 11 à 13, caractérisée en ce que, lorsque la position de prédensification (V) et la position de densification finale (E) du plateau de presse à vapeur (8) est atteinte, le dispositif (8) de commande des plateaux de presse envoie au dispositif (7) de réglage d'application de la vapeur, des signaux de commande qui déclenchent la mise en oeuvre des dispositions indiquées d'envoi de vapeur pendant la première partie (tlt2) de l'intervalle de temps (tlt4) de production de vapeur et pendant le reste de l'intervalle de temps (t3t4) de production de vapeur.
15. Installation selon l'une des revendications 11 à 14, caractérisée en ce que le dispositif (8) de commande des plateaux de presse et le dispositif (7) de réglage d'application de vapeur peuvent être commandés, conformément à un programme, entre la position de prédensification (V) et la position de densification finale (E) des plateaux de presse à vapeur (1, 2) ainsi que, éventuellement, après que la position de densification finale (E) a été atteinte.
EP84110158A 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois Expired EP0172930B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/599,599 US4517147A (en) 1984-02-03 1984-04-13 Pressing process for composite wood panels
AT84110158T ATE38177T1 (de) 1984-08-25 1984-08-25 Verfahren und anlage zur herstellung einer holzwerkstoffplatte.
EP84110158A EP0172930B1 (fr) 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US57678684A 1984-02-03 1984-02-03
US06/599,599 US4517147A (en) 1984-02-03 1984-04-13 Pressing process for composite wood panels
EP84110158A EP0172930B1 (fr) 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois

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EP0172930A1 EP0172930A1 (fr) 1986-03-05
EP0172930B1 true EP0172930B1 (fr) 1988-10-26

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US4517147A (en) 1985-05-14

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