EP2179863A1 - Method for refining a carrier plate, in particular a wood or composite plate - Google Patents

Abstract

The method involves applying an unvarnished decorative paper (102) on a surface of a carrier plate (100), and laminating the paper with the carrier plate. A melamine resin layer (103) is applied on the laminated paper as a sealing functional layer. A layer structure is compressed between upper and lower press plates (1, 11) of a short-cycle press under influence of heat and pressure to melt the resin layer. A film (8) provided with slots and/or ridges is arranged below the upper plate. The molten resin is smoothly adapted to the slots and/or ridges to form a structure after curing the resin. An independent claim is also included for a pressing device for pressing and structuring a carrier plate.

Description

The invention relates to a method for finishing a support plate, in particular a wood or wood-based panel, on the surface of a non-resin decorative paper is laminated and laminated with the carrier plate, applied to the laminated decorative paper a melamine resin layer as a sealing functional layer and then dried, the layer structure between an upper and a lower pressure plate of a short-cycle press is pressed under the action of heat and pressure and thereby melt the resin layers. Furthermore, the invention relates to a pressing device.

The method described above is for example from the EP 1 225 033 B1 known. The plates produced by the process are used, for example, for furniture construction as a table top. They can also be used as panels. especially wall and floor panels.

Floor panels with a base plate made of wood material are commonly referred to as laminate panels and have been for many years for the substitution of parquet in the trade. To obtain a smooth surface, the surface of the support plate is first ground and then applied a primer of one or more melamine resin layers. On the primer is then the desired decor (parquet, wood grain, tiles, etc.) printed. On the printed decor then a functional layer is applied for sealing the top. If the carrier plate is then to be further processed to floor panels, wear-resistant particles, such as corundum, are embedded in the functional layer. Finally, the layer structure is pressed and in the process a structure (relief) corresponding to the decor is embossed in order to match the visual and haptic impression with the natural material reproduced by the decor.

From the WO 2007/059805 A1 is a coating system with flowable coating material for smooth or textured surfaces known. In order to provide the surface of the coating material with a structure, a material web with a structured surface is used. On the input side of the coating system, a carrier material is supplied, which is coated with a flowable material. Below the material web a collecting device is provided, which is funnel-shaped in cross section together with the material web, so that the flowable material can be applied to the carrier plate. While the carrier plate is transported with the overlying web through the device, the coating material hardens and it forms in its surface, the predetermined structure of the material web. The pressing device is very complex. As a coating material expensive UV coatings must be used.

It is also known to introduce surface structures in laminated on wood-based panels film packages on texturizer films on rotary presses. Since the film package is already finished, both a high pressure and a high temperature is needed. Since both the applicable pressure and the temperature are limited by the structural design of the circulating press, such systems run only very slowly. The reusable structurizer film survives only a limited number of passes, so that this method is also quite expensive.

Based on this problem, the method described at the outset for refining a carrier plate is to be improved and a press device is to be created with which correspondingly coated carrier plates can be structured quickly and cost-effectively.

To solve the problem, a textured film provided with depressions and / or elevations is arranged below the upper press plate, which ensures that the molten synthetic resin flows smoothly to the depressions and / or elevations of the texturing film, whereby a. After curing of the resin Structure forms.

The surface created in this way is characterized by a new visual and haptic impression. The product surfaces are softer or more velvety, which is due to the effect of the structuring film instead of a hard steel pressed sheet. Since the structure is carried out in a short-cycle press by means of the structuring sensor film, the desired structure can be quickly and inexpensively changed or replaced. So it can be made on a pressing device a wide range of products.

In order to avoid a subsequent buffing of the support plate or the panels produced therefrom, a counteracting layer is preferably applied to the underside prior to pressing.

On the top of the carrier plate, an adhesive is first applied areally. The adhesive can be rolled, brushed or sprayed on. Thereafter, the non-resin decorative paper is applied by unwinding from a roll. Subsequently, the decor paper is pressed under the action of pressure and / or temperature with the large-sized carrier plate. At least one functional layer of melamine-based resin is then applied as a seal on top of the decorative paper laminated with the carrier plate.

By using a non-impregnated decor paper, the production is inexpensive and feasible on simple and proven laminating machines.

Before laminating the decorative paper, the surface of the support plate may be primed with a melamine- and / or urea-based resin and then dried. The primer is preferably applied liquid in a direct coating plant.

The primer is preferably applied to the ground surface of the top of the carrier plate. As a result, a very smooth surface is achieved and a sharp structuring possible, which improves the visual and haptic impression of the finished finished carrier plate.

The laminated with the decor paper backing plate can be supplied as a prefabricated intermediate for liquid coating a direct coating plant. From the direct coating system, the plate is then fed to a pressing device, preferably a KT press (short-cycle press).

A pressing device for pressing and structuring carrier plate provided with a plurality of resin layers with an upper pressure plate and a lower pressure plate is characterized in that a patterning foil provided with depressions and / or elevations is to be arranged below the upper pressure plate.

The texturing film is inexpensive to produce compared to a press plate. Although their wear behavior lags behind that of a press plate, their use is still more economical. The press can be converted quickly if the structure is to be changed because the decorative paper has been changed. In addition, decorsynchronous structures are easier to set up. Due to the quick change of decorative paper and associated shear foil can be produced a high quality and wide range of products.

The texturizer film is preferably applied to the press plate. In particular, it is preferably fixable to the pressing plate, which can be done for example by suction, electrostatic charging or adhesion.

Preferably, an unwinding device is arranged on one side next to the upper press plate, and a winding device for the texturing film is arranged on the opposite side. On the structure-forming film, the structure matching the printed decor is embossed in each case in the associated plate size. The structure can be repeated on the foil tape. However, it is also possible for different structures to be provided one behind the other (in each case in plate size) on the structure-forming film.

Preferably, the upper pressure plate has a press plate provided with a plurality of openings, and the openings communicate with a pneumatic device.

From the pneumatic device, a negative pressure for sucking the pattern generator film can be generated. Preferably, the structurizer film then completely covers the openings in the press plate. In order to remove the structure sensor film applied to the press plate, the pneumatic device may preferably generate an overpressure in a pulse-like manner, which blows the structured-film from the press plate.

The short-cycle press allows integrated flow production to be realized.

With the aid of a drawing, an embodiment of the invention will be explained in more detail below.

Figur 1

- die schematische Ansicht einer Fertigungsstraße.

Figur 2

- die schematische Seitenansicht einer Kurztakt-Presse.

It shows:

FIG. 1

- The schematic view of a production line.

FIG. 2

- The schematic side view of a short-cycle press.

FIG. 2 schematically shows the side view of a short-cycle press 60 (KT press) with the upper pressure plate 1 and the lower pressure plate 11. The upper pressure plate 1 consists of the upper frame 2, the press pad 3 and the press plate 4. The arranged on a press table 12 lower Press plate 11 consists of the base 13, the press pad 14 and the press plate 15th

The lower press plate 11 is rigid. About the impression cylinder 5, the upper pressure plate 1 can be lowered to the lower pressure plate 11 and pressurized. The press plates 1, 11 are heated by thermal oil in a known manner. On the press plate 4, which is provided with a plurality of openings, not shown, is applied to the structure sensor film 9, in which a structure is impressed. The openings in the press plate 4 are connected to a both negative pressure and positive pressure generating pneumatic device 50 in connection. On both sides next to the upper pressure plate 1, an unwinding device 6 and a winding device 10 are arranged opposite one another. The structuring film 8 is unwound from the unwinding device 6 and simultaneously wound up by the winding device 10. About deflecting rollers 7, 9, the pattern generator film is guided below the press plate 1. When the pneumatic device 50 generates negative pressure, the structuring film 9 is sucked onto the press plate 4. To release a pneumatic blast is generated via the pneumatic device 50, which blows the structure-sensor film 8 from the press plate 4.

For smoothing the surface, the large-sized support plate 100, for example, an MDF or HDF plate, be abraded by 0.1 mm. Then, melamine-based or urea-based liquid resin or a mixture of both may be applied to the top for priming and dried to the layer 101. On the dried melamine resin layer 101, a non-resin decorative paper 102 is placed by this is unwound from a roll 32. This is done in a known laminating device 30, in which the applied decorative paper 102 is then laminated with the carrier plate 100. Then, in a direct coating system 40 into which the laminated carrier plate is introduced as a prefabricated intermediate product, at least one functional layer 103 is applied as a seal of the upper side. In the functional layer 103, which consists of a melamine-based synthetic resin, the abrasion and / or the scratch-resistance-increasing particles can be integrated. The functional layer 103 can also be formed antistatic.

To compensate for the effect of the layer structure 101, 102, 103 on the upper side of the carrier plate 100, at least one counter-tensile layer 104 is applied to its underside and dried. Subsequently, the carrier plate 100 is transported into the short-cycle press 60 and placed on the lower press plate 11. The structure of the patterning film 8 corresponding to the decor of the decor paper 102 is selected and then pulled under the upper press plate 1 by driving the take-up device 10. In this case, the structure sensor film 8 is wound from the unwinding device 6. The structuring film 8 is sucked onto the press plate 4 and then the upper press plate 1 is lowered onto the carrier plate 100. Due to the heat and the pressure, the resin layers melt and the liquid resin runs into the recesses or fills the gaps between the elevations of the structuring film 8, so that after curing of the resin, a structure corresponding to the decoration in the surface of the Carrier plate 100 was generated.

The decorative paper 102 can directly on the top of the support plate 100th be laminated on. For this purpose, an adhesive 105 is first rolled in the laminating device 30 with a roller 31. The adhesive 105 used are conventional glues or adhesives, in any case those which are subsequently compressible with further layers on the KT press 60. On the layer of adhesive 105, the decorative paper 102 is placed by being deposited by the roller 32. About the rollers 33. 34 then the decorative paper 102 is laminated. The prefabricated carrier plate 100 can be stored temporarily and later entered into a direct coating system 40, in which a liquid overlay as a functional layer 103 is rolled over a roller 41. At the same time, the backing layer 104 can be applied liquid to the roller 42 on the underside. From the direct coating system 40, the carrier plate 100 then enters the KT press 60.

LIST OF REFERENCE NUMBERS

1

Upper press plate

2

upper frame

3

press pad

4

press plate

5

pressure cylinder

6

unwinding

7

idler pulley

8th

Aerating film

9

idler pulley

10

rewinder

11

Lower press plate

12

press table

13

undercarriage

14

press pad

15

press plate

30

laminating device

31

roller

32

roller

33

roller

34

roller

40

Direct coating plant

41

roller

42

roller

50

pneumatic equipment

100

Carrier plate / wood material board

101

primer

102

decorative paper

103

functional layer

104

counteracting

105

adhesives

Claims (16)

Method for finishing a carrier plate (100), in particular a wood or wood-based panel, on the surface of which an unhardened decorative paper (102) is laid and laminated with the carrier plate (100), on the laminated decorative paper (102) at least one melamine resin layer (103) sealing functional layer is applied and then dried, wherein the layer structure between an upper and a lower pressure plate (1, 11) of a short-cycle press under the action of heat and pressure is pressed and thereby melt the synthetic resin layers (101, 103), characterized in that below the upper press plate (1) is provided with a recess and / or elevations textured film (8), and the molten resin is the recesses and / or elevations of the pattern generator film (8) adapts, whereby after curing of the synthetic resin forms a structure. A method according to claim 1, characterized in that the laying of the decorative paper (102) takes place by unwinding from a roll. A method according to claim 1 or 2, characterized in that before the pressing on the underside of the carrier plate (100) at least one Gegenzugschicht (104) is applied. Method according to one or more of the preceding claims, characterized in that the surface is primed prior to lamination with a resin based on melamine and / or urea and then dried and the primer (101) is preferably applied liquid. A method according to claim 4, characterized in that the primer is applied to the ground surface of the upper side of the carrier plate (100). Method according to one or more of the preceding claims, characterized in that the support plate (100) laminated with the decorative paper (102) is fed as a prefabricated intermediate product to a direct coating installation (40) in which the functional layer (103) is applied. Pressing device for pressing and structuring carrier plates (100) provided with a plurality of resin layers (101, 103, 104), in particular wood or wood-based panels, with an upper press plate (1) and a lower press plate (2), characterized in that below the upper press plate (1) is to be arranged with a structured sensor film (8) provided with depressions and / or elevations. Pressing device according to claim 7, characterized in that the structure foil (8) rests against the pressing plate (1). Pressing device according to claim 7 or 8, characterized in that the structured film (8) can be fixed to the pressing plate (1). Pressing device according to claim 9, characterized in that the structure foil (8) can be sucked onto the pressing plate (1). Pressing device according to one or more of claims 7 to 10, characterized in that on the one side next to the upper press plate (1) an unwinding device (6) and on the opposite side of the press plate (1) a take-up device for the texturing film (8 ) are arranged. Pressing device according to one or more of the preceding claims, characterized in that the upper pressure plate (1) has a pressure plate (4) provided with a plurality of openings and the openings are in communication with a pneumatic device (50). Pressing device according to claim 12, characterized in that from the pneumatic device (50), a negative pressure for sucking the pattern-forming film (8) to the press plate (4) / the press plate (1) can be generated. Pressing device according to claim 12 or 13, characterized in that from the pneumatic device (50) an overpressure for blowing off the structured film (8) from the press plate (4) / the press plate (1) can be generated. Pressing device according to claim 14, characterized in that the overpressure can be generated in a pulse-like manner. Pressing device according to claim 12, characterized in that the openings in the press plate (4) of the pattern-forming film (8) are completely coverable.

Images