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(11) | EP 0 473 631 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
A SOLID GLUED BOARD PRESS PRESSE FÜR MIT KLEBSTOFF BESCHICHTETE BRETTER PRESSE POUR PLANCHES PLEINES COLLEES |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The object of the invention is a solid glued board press, in particular a blockboard press, which includes a glue handling device, two or more glue nozzles, a glue distribution device, strip handling devices to transport the wood strips past the nozzles, and a press section.
[0002] Various kinds of continuously operating blockboard presses are known. These are typically continuously operating in such a way that wood strips of a particular size are fed to the press as a continual flow at the same time as glue is fed from a nozzle to one vertical surface of the strip. The press includes sensor devices that open the glue channel when a wood strip comes close to the glue nozzle. The glue channel closes when the wood strip leaves the area of influence of another sensor device. After this the strip is taken to a press, in which the strips are placed one after the other to correspond to the desired size of the sheet. One example of a prior art device of this kind is described in EP-A-0 041 033. This press has a pivotable gluing head with one or more gluing nozzles arranged perpendicularly to the direction of flow of the wood strips. A problem with the known gluing presses is the poor controllability of the glue and due to this the unreliability of gluing devices and the difficulty of adjusting the width of the gluing.
[0003] Several known gluing presses use a glue nozzle of a standard size, in which case glue has spilled over narrow wood strips to a considerable extent. The excess glue can even cause disturbances in operation and at the very least additional cleaning.
[0004] The intention of this invention is to create a solid glued board press, by means of which the aforementioned defects can be avoided. The invention is especially intended to improve the operation of the gluing head. The principal characteristic features of the invention appear in Claim 1.
[0005] In a gluing press in accordance with the invention the glue is fed precisely over the whole length and breadth of the wood strip. The nozzles are, however, closed between the strips and the operation is thus considerably cleaner than previously. In order to control several glue nozzles it is advantageous to form a gluing head in accordance with Claim 2. Other advantageous forms of application are shown in connection with the latter example of application.
[0006] In what follows the invention is illustrated by reference to the accompanying figures which show one kind of glued board press gluing head in accordance with the invention, and its operation.
- Figure 1
- shows the gluing head seen from above.
- Figure 2
- shows the gluing head seen from the side.
[0007] The glued board press consists of wood strip handling devices, a gluing head, and the press itself. The accompanying figures only show the wood strip handling devices at the gluing head and the gluing head itself.
[0008] The wood strip handling devices move one strip at a time past the gluing head 1 with the aid of a guide plate 19 and counter-wheel 10. By means of these the wood strip pushes in the ball valves of the nozzles 8 of the gluing head and glue extrudes onto the surface of the wood strip. As the wood strip passes the gluing head the balls 7 return to the extreme position by means of the pressure and springs 15 close the nozzles 8.
[0009] The glue distribution device includes a glue reservoir 20, a pump 12, a return circulation channel and its pressure valve 16, operating valve 11 and the glue channel 21 that leads from it to the nozzles 8. In the gluing head 1 the glue is distributed to each nozzle 8 through separate restriction valves 13. By means of these the flow of the glue is suitably regulated. In certain cases a greater flow is wished for in the upper nozzle than in the lower.
[0010] The device also includes normal sensor components, by means of which it is known when the wood strip is close to the gluing head, on the basis of which the control valve 11 is switched to the feed position. The gluing nozzles 8 open only when the wood strip pushes the ball of the shut-off device 7 inwards. When the wood strip has passed each nozzle the spring in it pushes the ball shut and the nozzle 8 closes. As long as the nozzles 8 are closed, the pump 12 pushes the glue flow through the pressure valve 16 to the glue reservoir 20.
[0011] Figure 2 shows the principle of the control of the width of the gluing. Wood strips of different widths 9, 14 can be glued by the same gluing head by adjusting its angle. The line formed by the gluing nozzles 8 is turned in such a way that its width corresponds to that of the wood strip. The figure shows the gluing head and the position of the gluing nozzles 8 for two different widths of strip. The width adjustment is stepless from the minimum wood strip width up to the maximum strip width.
[0012] The adjustment of the angle takes place by loosening the handwheel 6 and by turning the gluing head 1 round the axle pin 17 then locking the gluing head into the new position by means of the handwheel 6. Height adjustment takes place by turning handwheel 3, when the entire gluing head moves vertically along guide 4.
1. A solid glued board press, in particular a blockboard press, which includes a glue
handling device, two or more gluing nozzles (8), a glue distribution device, wood
strip handling devices to transport a wood strip (9) past the nozzles (8) and a press
section, the gluing nozzles (8) including shut-off devices (7), which are arranged
in such a way that when the wood strip (9) presses against the shut-off device (7)
it opens the gluing nozzle (8) and glue flows onto the surface of the wood strip (9),
characterised in that the press includes at least two gluing nozzles (8) which are aligned at a
gluing level corresponding to the surface of the wood strip (9) and which can be rotated
as a unit (1) around an axis perpendicular to the gluing level in order to alter the
gluing width.
2. A solid glued board press in accordance with Claim 1, characterized in that the gluing nozzles (8) are located in a separate gluing head (1) and that
the glue distribution device includes a glue reservoir (20), a pump (12), a control
valve (11) and glue channels (21) to lead the glue to the gluing nozzles (8) and that
each gluing nozzle has its own flow restrictor (13).
3. A solid glued board press in accordance with Claims 1 or 2 characterized in that it includes a wood strip guide (19) located at essentially the level of the
gluing surface, which extends on either side of the gluing nozzle (8) and which press
includes a counter wheel (10) located on the opposite side to the gluing nozzles (8),
which forces the wood strip to move against the tips of the gluing nozzles (8).
4. A solid glued board press in accordance with one of Claims 1 - 3, characterized in that the aforementioned shut-off device (7) is formed by a spring- loaded ball
valve, in which the ball that closes the gluing nozzle (8) is arranged to protrude
slightly from the tip of the gluing nozzle (8) in such a way that when it is pressed
it opens the channel of the nozzle (8).
5. A solid glued board press in accordance with one of Claims 1 - 4, characterized in that the press includes an operating device (5) to move the nozzles (8) to the
gluing surface and a distance away from it.
1. Platten-Klebepresse, insbesondere eine Blockplattenpresse, welche versehen ist mit
einer Klebstoff-Handhabungsvorrichtung, zwei oder mehr Klebstoffdüsen (8), einer Klebstoff-Verteilereinrichtung,
und einer Holzstreifen-Handhabungseinrichtung zum Transportieren der Holzstreifen
(9) hinter die Klebstoffdüsen (8) und hinter einen Preßabschnitt, wobei die Klebstoffdüsen
(8) Absperreinrichtungen (7) aufweisen, welche derart angeordnet sind, daß wenn der
Holzstreifen (9) gegen die Absperreinrichtung (7) gedrückt wird, diese die Klebstoffdüsen
(8) öffnet und Klebstoff auf die Oberfläche der Holzstreifen (9) strömt, dadurch gekennzeichnet,
daß die Presse mindestens zwei Klebstoffdüsen (8) aufweist, welche auf eine Klebeebene
der Oberfläche der Holzstreifen (9) entsprechend ausgerichtet sind und welche als
eine Einheit (1) um eine Achse gedreht werden können, die sich senkrecht zu der Klebeebene
erstreckt, um so die Klebstoffbreite zu verändern.
2. Platten-Klebepresse nach Anspruch 1, dadurch gekennzeichnet, daß die Klebstoffdüsen
(8) in einem separaten Klebekopf (1) angeordnet sind und daß die Klebstoff-Verteilereinrichtung
einen Klebstoff-Vorratsbehälter (20), eine Pumpe (12), ein Steuerventil (11) und Klebstoffkanäle
(21) aufweist, welche den Klebstoff zu den Klebstoffdüsen (8) führt und wobei jede
Klebstoffdüse ihre eigene Strömungs-Drosseleinrichtung (13) aufweist.
3. Platten-Klebepresse nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß sie
eine Holzstreifenführung (19) aufweist, welche im wesentlichen auf dem Höhenniveau
der Klebefläche angeordnet ist, und welche sich in Richtung beider Seiten der Klebstoffdüse
(8) erstreckt, und wobei die Presse eine Gegen-Anpreßrolle (10) aufweist, welche auf
der gegenüberliegenden Seite der Klebstoffdüsen (8) angeordnet ist, und welche die
Holzstreifen gegen die Spitzen der Klebstoffdüsen (8) anpreßt.
4. Platten-Klebepresse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß
die oben erwähnte Absperreinrichtung (7) durch ein federvorgespanntes Kugelventil
ausgebildet wird, wobei diejenige Kugel, welche die Klebstoffdüse (8) verschließt,
so angeordnet ist, daß sie etwas über das äußere Ende der Klebstoffdüse (8) derart
herausragt, daß wenn ein Druck auf die jeweilige Kugel ausgeübt wird, diese den Kanal
der Düse (8) öffnet.
5. Platten-Klebepresse nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß
die Presse eine Betätigungseinrichtung (5) aufweist, um die Düsen (8) zu der Klebefläche
zu bewegen und um diese um einen bestimmten Abstand von der Klebefläche wegzubewegen.
1. Presse pour planches pleines collées, en particulier presse pour lattés, qui comporte
un dispositif de manipulation de colle, deux ou plus de deux buses de collage (8),
un dispositif de distribution de colle, des dispositifs de manipulation de bande de
bois destinés à transporter une bande de bois (9) au-delà des buses (8) et un tronçon
de presse, les buses de collage (8) comportant des dispositifs de coupure (7), qui
sont agencés d'une manière telle que lorsque la bande de bois (9) appuie contre le
dispositif de coupure (7) elle ouvre la buse de collage (8) et de la colle s'écoule
jusque sur la surface de la bande de bois (9), caractérisée en ce que la presse comporte
au moins deux buses de collage (8) qui sont alignées à un niveau de collage correspondant
à la surface de la bande de bois (9) et qui peuvent être mises en rotation en tant
qu'ensemble (1) autour d'un axe perpendiculaire au niveau de collage afin de modifier
la largeur de collage.
2. Presse pour planches collées pleines selon la revendication 1, caractérisée en ce
que les buses de collage (8) sont positionnées dans une tête (1) de collage séparée
et en ce que le dispositif de distribution de colle comporte un réservoir de colle
(20), une pompe (12),une vanne de commande (11) et des canaux (21) pour colle destinés
à amener la colle vers les buses de collage (8) et en ce que chaque buse de collage
a son propre dispositif de restriction d'écoulement (13).
3. Presse pour planches pleines collées selon la revendication 1 ou 2, caractérisée en
ce qu'elle comporte un guide (19) de bande de bois situé pratiquement au niveau de
la surface de collage, qui s'étend de chaque côté de la buse de collage (8) et en
ce que la presse comporte une contre-roue (10) située sur le côté opposé par rapport
aux buses de collage (8), qui force la bande de bois à se déplacer contre les extrémités
des buses de collage (8).
4. Presse pour planches pleines collées selon l'une quelconque des revendications 1 à
3, caractérisée en ce que le dispositif de coupure (7) est formé par une vanne à bille
chargée par un ressort, dans laquelle la bille qui ferme la buse de collage (8) est
agencée pour faire légèrement saillie à partir de l'extrémité de la buse de collage
(8) de telle sorte que lorsqu'elle est repoussée elle ouvre le canal de la buse (8).
5. Presse pour planches pleines collées selon l'une quelconque des revendications 1 à
4, caractérisée en ce que la presse comporte un dispositif d'actionnement (5) destiné
à déplacer les buses (8) vers la surface de collage et à les éloigner de celle-ci.