DE19917828B4 - Process and plant for the production of decorative panels - Google Patents

Abstract

Process for the production of decorative panels in a short-cycle press, in which withdrawn from two film rolls film webs applied to the lower and on the upper surface of a support plate to a layer stack and separated by means of a laser beam, the layer package retracted into the KT press and under the action of pressure and heat are pressed to a decorative plate, characterized by the following process steps:
1.1 the film webs are placed on the removal of film rolls only partially on the surfaces of the moving support plates,
1.2 the carrier plate and the film webs are stopped before the full-surface support of the film webs,
1.3 then takes place the stationary separation of the film webs according to the support plate length at the top and bottom simultaneously by a respective laser beam separation device using a focused on the same dividing line laser beam and
1.4 in the subsequent continuation of the carrier plate, the film webs are placed over the entire surface to form the layer package and in the short-cycle press for the pressing process ...

Description

The The invention relates to a method for producing decorative panels according to the preamble of patent claim 1 and to an installation for carrying out the Method according to the preamble of claim 2.

It is off DE 24 58 656 A1 known to separate endless paper webs on predetermined formats by a transverse section of a laser beam, wherein the paper webs are separated format format with a synchronous with the paper web speed and transverse laser beam separating devices during the cutting process. A method and an apparatus for separating two film webs and placing them on a carrier plate in the context of a coating system with a short-cycle press are thus not shown.

• • die longitudinale und transversale Bewegung der Trennköpfe,
• • die Breite des Trennspaltes,
• • die Niederhaltung der Folien,
• • die Höheneinstellung und Fokussierung der Trennköpfe.

Another method after DE 19627450 C1 describes the cross-cutting with laser beam from endless paper webs peeling paper webs for one or two-sided coating of plate-shaped workpieces in a press, wherein the workpieces by a gap spaced from each other, are transported one behind the other to the press. The upper and / or lower sides to be coated are covered with an upper or lower film web, wherein each film web in the region of the gap is separated from a focal point of the laser beam focused on the film web by a focusing device arranged on a cutting head. A disadvantage of this method and the device is the complex continuous separation process during the charging process of the workpieces, although the film coating itself is discontinuous. The following individual components require constant monitoring and adjustment:

• The longitudinal and transversal movement of the separating heads,
• The width of the separating gap,
• • the holding down of the films,
• • the height adjustment and focusing of the separating heads.

at The continuous separation of the workpieces requires the entire separation device be moved along with the transport speed, so that the two laser heads make the separation in a transverse movement in the gap can. adversely in this device is also that in such a continuous Process in principle Slit and thus with a film overhang between 1 to 1.5 cm per side of the workpiece has to be worked. Subsequently, to carry out the new cut respectively the entire device again longitudinally opposite moved the transport device and accurately controlled in the separation gap become. These are very complicated control and regulation processes in connection with a movement of big ones Masses.

Further it requires monitoring the separation gap width, because it must after the laser cutting section of the top sheet always a free gap for the second laser head to Separation of the bottom film can be provided. In addition comes the supervision of the Hold-down airflow, since the films usually, among other possibilities, with the help of a constant stream of air on the surface of the Pressed carrier plate and at a not sufficient contact pressure Focusing directly on the film surface fails. This focusing problem continues in production different plate thicknesses and thus different height settings of the upper separation head or changed set focus.

When cutting the film webs by means of known mechanical cutting tools, the following disadvantages and problems arise:
The particles and chips produced by the separation process can get between the films and the carrier plates and thus lead to unevenness in the surfaces of the decorative panels during the pressing process. Such bumps result in either a loss of quality or rejects on decorative panels and the quality of cut the separation point requires constant monitoring and in particular with regard to the wear of the cutting tools, which leads to snippet and cracking at the edges of the film.

Of the Invention is based on the object while avoiding the described Disadvantages of specifying a method and to create a plant so high quality and cutting accuracy at high cutting speeds be achieved at the cut edges of the slides and that no large masses have to be moved during the separation process.

The solution this task for The method consists according to claim 1 in that in the first step the Film webs when removing film rolls only partially on the surfaces who is moving forward moving carrier plates be hung up, then the carrier plate and the film webs before the full-surface edition of the film webs be stopped and the stationary separation of the film webs according to the backing plate length above and below at the same time by a laser beam separating device with Help a laser beam always focused on the same dividing line takes place and during the subsequent onward travel of the carrier plate the film webs over the entire surface placed under the formation of the layer package and in the short-cycle press for the pressing process be retracted.

The solution the task for The system is therefore that ever a laser beam separation device for the upper and lower dividing line of the dormant during separation and only partially provided film webs of the layer package is provided, wherein the upper and lower laser beam separating device in firmly anchored Rails of Beschickgestells are arranged transversely movable.

Of the Advantage of the invention is that without significant productivity gaps the Foils fitting in length unwound to the carrier plate length can be. Each film, top and bottom film, is a laser beam separator assigned directly traversing to the same always Distance to the foil surfaces drives along and thus always only a same, lower separation energy needed and the laser beam separation devices only one movement, namely the separation process over the Width from left or right must perform. Next is an accurate one Separating gap lead or expansion device not necessary. Because of the same always Distance of the laser beam separating device to the film surface results an equal energy supply. A changing power setting between upper and lower foil not necessary. Depending on the film behavior or film thickness or resin adjustment, the supplied separation cut power for the laser beam separator via a Calculator targeted and controlled.

in the Comparison to a mechanical cutting to length of the film web using a knife cutting results in the following advantages with the method and the plant according to the invention, The laser beam separating device works absolutely wear-free a mechanical blade change is no longer necessary. Therefore eliminates the change times and there is a higher availability in the use of the plant itself.

Thereby, that in comparison to the mechanical section no snippets or Sprödungseffekte on the resin surface may occur, Cracking, the film supernatant can to the carrier plate be set lower. The result is a material saving and it can in case of very fast operating feeders, less disturbance to the protruding Foil edges occur.

Further advantageous measures and embodiments of the subject matter of the invention will become apparent from the dependent claims and the following description with the drawing.

The drawing shows the system for carrying out the method according to the invention in a side view from left to right with the double sheet drawing device 6 and the layer package 1 into the short-cycle press (KT-Presse) 5 feeding feeding belt 7 , The loading belt 7 It also serves as a merging and laying device for the double film drawing device 6 , In the process, the film webs become 2 ' and 4 ' from the film rolls 8th and 9 deducted in the loading direction, on the incoming carrier plate 3 Fixed at its front edge and with the Beschickgeschwindigkeit it partially so placed that a part of the intended film web lengths of the support plate 3 stand up and still in the laser beam separating devices 13 and 14 are located. After the stoppage of the conveyor belt 7 the separation of the film webs takes place 2 and 4 according to the carrier plate length by transverse movement of the laser beam separation devices 13 and 14 either from the left or from the right through the guide rails 11 and 12 exactly at the dividing line 16 , At the next Beschickgang the separated film webs 2 and 4 with the help of a defect 17 completely on the carrier plate 3 rolled up or pressed. The incoming carrier plate 3 ' and the outgoing carrier plate 3 will be without significant impact gap 10 to each other on the conveyor belt 7 guided. The laser beam separation devices 13 and 14 are each in a stationary, in the loading frame 15 anchored lower and upper guide rail 11 and 12 movably provided, wherein the dividing line 16 always for both film webs 2 ' and 4 ' exactly in the same place. The separation of the film webs 2 ' and 4 ' can emanate in an advantageous manner from both sides, since the laser beam separation devices 13 and 14 work from left and right.

1

layer packet

2

upper sheet

2 '

incoming sheet

3

support plate

3 '

incoming support plate

4

lower sheet

4 '

incoming sheet

5

Short-cycle press

6

Double film pulling device

7

Feeding conveyor

8th

upper film roll

9

lower film roll

10

adjoining gap

11

upper guide rail

12

lower guide rail

13

upper Laser beam cutter

14

lower Laser beam cutter

15

Beschickgestell

16

parting line

17

defect

Claims (2)

Process for the production of decorative panels in one Short-cycle press, in the film webs taken from two film rolls on the lower and on the upper surface of a carrier plate applied to a layer package and using a laser beam separated, the layer package in the KT press retracted and under Action of pressure and heat be pressed to a decorative plate, characterized by the following Steps: 1.1 the film webs are pulling off of film rolls only partially on the surfaces of the moving forward carrier plates hung up, 1.2 the carrier plate and the film webs are stopped before the entire surface of the film webs, 1.3 subsequently done stationary the separation of the film webs according to the carrier plate length above and below at the same time by a laser beam separating device using a laser beam that is always focused on the same separation line and 1.4 in the subsequent continuation of the carrier plate the film webs are full surface placed under the formation of the layer package and in the short-cycle press for the Retracted pressing process. Plant for carrying out the method according to claim 1, comprising a cyclically operating charging device for the carrier plates and double film pulling device acting thereon, consisting of two film rolls, each with a trigger and Auflegevorrichtung to form a layer package, a laser beam separating device and a short-cycle press, characterized in that one each Laser beam separating device ( 13 . 14 ) for the upper and lower dividing line ( 16 ) of the resting when separating and only partially launched film webs ( 2 ' . 4 ' ) of the layer package ( 1 ) is provided, wherein the upper and the lower laser beam separating device ( 13 . 14 ) in firmly anchored rails ( 11 . 12 ) of the loading frame ( 15 ) are arranged transversely movable.