EP0545390B1 - Board with postforming edge - Google Patents

Abstract

A board (1) with a postforming edge consists of a backing material such as, for example, chip fibre, solid wood, plywood, MDF or the like which carries on at least one surface a coating (2) of a relatively thin material, at least one end face (21) of the board being designed as a postforming edge which consists of at least two mutually dependent materials, namely the coating (2) and a coating backing (6, 22) which are together bent around the board end face, for example forming a radius, and are connected to this end face in a positive-locking manner. The mutual dependency is given firstly by a requisite rigidity and the cohesion during the cutting operations and secondly by adequate flexibility and thermal stressing capacity during the bending around the rounded edge of the board. The coating backing is made of a wooden material.

Description

The invention relates to a plate with a postforming edge according to the preamble of patent claim 1.

Such a plate with a so-called postforming edge is already known from EP-A-0 370 353 and EP-A-0458 242, such a plate being provided with a plastic coating which e.g. consists of a melamine laminate, in the production of which several layers are bound in the lamination process by melamine resin and thus results in a relatively rigid, inherently stable plastic coating of the plate.

Chipboard or MDF or plywood is used as the board material for this.

It is also known from these publications to produce the postforming edge in such a way that a fold is first milled out from the top or front side of the plate and in the region of this fold the material of the plate is removed to such an extent that one is in the immediate vicinity of the underside glued coating arrives. EP-A-0 370 353 states that the postforming laminate is exposed by milling off the carrier material.

This fold is milled so deep that only the thin, glued or laminated coating remains on the underside of the plate. EP-A-0 458 242 also exposes the coating by removing chips from the plate.

A fillet is then milled on the front edge of the fold in the transition area between the front edge of this fold and the coating that has remained. Then the front edge is machined in the later desired radius of the postforming edge.

A hot-melt adhesive is then poured into the previously milled fillet, and the plastic material of the remaining coating is deformed under pressure and heat, so that it is pulled over the radiused end edge of the fold and a so-called postforming edge is thereby achieved.

Previously, postforming edges had only been produced with relatively rigid, inherently stable plastic coatings, because these plastic coatings withstand the high heat loads required during the deformation and because they have good surface resilience, which has the advantage that the production of the postforming edge without tearing the plastic material or otherwise Damage was made possible.

So far it was not known, such a postforming edge with a thin, foil-like decorative coating e.g. to design from a paper or a wood material, because this wood material, e.g. a thin wood veneer, is very sensitive to the deformation of such a postforming edge and would therefore tear and break.

For certain aesthetic reasons, however, it is desirable to design such postforming edges also from a wood-based material, wherein papers printed with wood decor also have a considerable cost advantage over the relatively thick laminates.

The invention is therefore based on the object of developing a plate of the type mentioned in such a way that a postforming edge can be formed in a cost-effective manner with a wood-based material or a faux-paper or foil-based decor.

The invention is characterized by the technical teaching of claim 1.

As stated at the beginning, the process for producing a postforming edge was known only with relatively rigid, inherently stable plastic laminates, this laminate being exposed by milling. In the invention, however, the coating carrier is also milled in order to form this coating carrier together with the coating as a postforming edge.

According to the invention, such a postforming edge can now also be formed from a thin wood material, for example a wood veneer (peeling or knife veneer). Likewise, a wood veneer is a coated veneer, which consists of a decorative layer made of real veneer, which is glued to a carrier material made of tissue, paper, PVC, thin paper or the like. Furthermore, the present invention comprises so-called MDF boards with a decorative coating, which consists of a paper or PVC material. According to the technical teaching of the innovation, a postforming edge is also formed here, the MDF board consisting of wood fibers in connection with the decorative coating above is reshaped according to the invention.

The invention has therefore recognized that for the production of postforming edges with real wood or the like arranged on the visible side, it is not sufficient to deform this real wood veneer alone because it is so thin and brittle that it would inevitably splinter and break. Instead, the invention proposes to deform a coating consisting of several layers so that the thin and brittle real wood veneer is supported and stabilized and can now be deformed in a surprising manner.

In particular, panels made of plywood material, MDF or chipboard or panels with hollow structures are preferred, which contributes to a substantial saving in weight.

Such hollow structures essentially consist of strips which form a peripheral frame, this frame defining a central, central cavity, and this frame being covered on both sides (top and bottom) by the wood-based material.

In the following, the invention will be explained in more detail with reference to drawings showing several possible embodiments. Further essential features and advantages of the invention emerge from the drawings and their description.

Figur 1a - 1h:

schrittweise Darstellung der Bearbeitung einer Platte zur Herstellung einer Postformingkante;

Figur 2:

Schnitt durch eine Platte nach der Erfindung vor Herstellung der Postformingkante;

Figur 3:

gleiche Darstellung wie in Figur 2 nach Herstellung der Postformingkante;

Figur 4:

schematisiert ein Schnitt durch eine weitere Ausgestaltung der Erfindung.

Show it:

Figure 1a - 1h:

step-by-step representation of the processing of a plate for producing a postforming edge;

Figure 2:

Section through a plate according to the invention before production of the postforming edge;

Figure 3:

same representation as in Figure 2 after production of the postforming edge;

Figure 4:

schematically shows a section through a further embodiment of the invention.

A plate 1 is shown in FIG. 1 a, which can consist of an MDF material, a chip fiber material or a plywood material. The plate 1 has on its top 3 a coating 2, which is also attached to the bottom 4. The coatings 2 are e.g. thin film-like surfaces which can be connected to the surface of the plate 1 in the lamination process.

According to FIG. 1b, a fold 5 is first milled into the material of the plate 1 from the top 3 of the plate 1, the overlying coating 2 also being removed in this area.

According to FIG. 1c, the fold depth of the fold 5 is now increased, so that the section which remains has only a thin material layer as the coating carrier 6 and a coating 2 forming the underside 4.

It is important that the material layer 6 serving as the coating carrier is formed from the material of the plate 1 that has remained in order to give the coating 2 on the underside 4 the mechanical stability necessary for the subsequent forming.

In the working process according to FIG. 1d, a rounding 7, which is designed as a groove 13, is milled in the area of the transition on the end face 21 of the fold 5 in the direction of the remaining material layer of the coating carrier 6.

According to FIG. 1e, this rounding 7 is deepened and enlarged by a groove cutter 8 which is subsequently moved up.

According to FIG. 1f, a fold 9 is then milled into the upper side 3, which has a depth that corresponds to the thickness of the material of the coating together with the coating carrier 2, 6.

In FIG. 1g, the end face 21 of the fold 5 is machined and a radius 10 is formed in order to achieve the later shaping of the postforming edge.

According to FIG. 1h, the front area of the material of the coating and of the coating carrier 2,6 is then cut off to the width in order to ensure that this cut edge is formed exactly in the edge area 12 of the fold 9 and this thereby results in a smooth transition from the Top 3 comes on the material 2.6 (= coating with coating carrier) when the postforming edge is finished (see also FIG. 3).

FIG. 2 shows the conditions according to the innovation enlarged on average.

It can be seen that the material layer of the coating carrier 6 is formed from the material of the plate 1 and supports the coating 2 during milling, and that a hot melt adhesive 14 has now been poured into the area of the fillet 13 in order to ensure a smooth and smooth transition in this Ensure area.

It is now important that the coating carrier 6 consists of the wood material of the plate 1, as was defined in the manner above. That means it is a wood veneer (peeled or knife veneer), chipboard hardboard, plywood or MDF. If the outer layer of the plate 1 consists of a wood veneer, then the coating carrier 6 is part of the plate 1 and can also be connected to paper, tissue, etc. for stabilization.

The material layer of the coating 2 and the coating carrier 6 produced in this way is bent in the direction of the arrow 15 in accordance with FIG.

At the same time, glue is applied to the inside of the material layer of the coating carrier 6 in order to ensure gluing on the rounded end face 21.

According to FIG. 3, the material is now bent over and thus forms the postforming edge according to the invention, which is now formed for the first time from a composite of a wood material as a coating carrier 6 with any top layer as a coating 2.

This was not possible before because either the wood-based material or the coating as such is so sensitive to processing that only laminates (laminates) could previously be processed.

In order to tear the wood material when spreading e.g. To prevent the transition from FIG. 1b to FIG. 1d, it is provided according to the invention that the coating 2 is sucked onto the processing table by applying a vacuum in order to stabilize this coating surface.

In this way it is possible to keep the thickness of the material layer 6 very small, e.g. in the range of 0.1 to about 1 mm.

FIG. 4 shows a construction of a plate according to the invention, it being essential that this plate is designed as a hollow plate for reasons of weight saving.

It can be seen that the coating 2 consists of a very thin decorative paper, which is printed, for example, with a wood grain, a plain color or any other color. This coating 2 is glued to a veneer layer 17, which veneer layer 17 can consist, for example, of a three-layer plywood material in a manner known per se. In another embodiment Instead of the veneer layer 17, this can consist of an MDF material or of a thin chipboard or hardboard.

In the exemplary embodiment according to FIG. 4, the veneer layer 17 consists of three layers 22, 23, 24 glued shut off to one another.

It is now important that the veneer layer 17 is thinned in such a way that only the cover layer 22 serving as the coating substrate, which is directly adjacent to the thin coating 2, also runs around the postforming edge 16, while all other layers 23, 24 in Area of the top 3 of the plate 1 remain.

The very thin coating 2 is thus only supported by the cover layer 22 and is thereby stabilized in the area of the postforming edge 16.

It is a hollow construction that consists of a frame-shaped structure, the frame consisting of strips 19, 20. In the exemplary embodiment shown, it is shown that two strips 19, 20 have been glued to one another and that the outer strip 20 has the machined end face 21 in each case.

In another embodiment, the strip 19, 20 may consist of a single piece.

It is important that the strips 19, 20 form a frame-like structure with the formation of a central cavity 18 so as to greatly reduce the weight of the entire plate.

It is now possible for the first time to use panels coated with wood-based material or thin decorative paper, which have postforming edges made from the same wood-based material, in leisure furniture construction. where great weight savings are important.

For the sake of drawing simplicity, the upper part of the plate is now shown in FIG. 4, the plate being able to be continued beyond the line of symmetry. According to FIG. 4, either an L-shaped postforming edge is then formed or a U-shaped postforming edge is formed, as is shown in FIG. 3.

DRAWING LEGEND

1

plate

2nd

Coating

3rd

Top

4th

bottom

5

Fold

6

Coating carrier

7

Rounding

8th

Grooving cutter

9

Fold

10th

radius

11

cut

12th

Edge

13

Groove

14

Hot melt adhesive

15

Arrow direction

16

Postforming edge

17th

Veneer layer

18th

cavity

19th

strip

20th

strip

21

Face

22

Top layer

23

layer

24th

layer

Claims (8)

1. A board (1) with a postforming edge (16), made of a wooden material, such as chip wood, solid wood, plywood, fibers of medium density (MDF), or the like, at least one surface (3, 4) thereof being provided with a coating (2) of a relatively thin material, wherein at least one front side (21) of said board (1) is formed as a postforming edge (16),
   characterized in that
   said postforming edge (16) consists of at least two component layers (2, 6) supporting each other, namely a sheet-like flexible coating (2) and a coating carrier (6) supporting said coating (2), said carrier (6) forming part of said board (1) in the shape of a relatively thin component layer and being bent around and connected with said front side (21) together with said coating (2).
2. The board of claim 1, characterized in that said coating carrier (6) is a wooden veneer (pared or knife-cut veneer) (17) or a plywood layer (22).
3. The board of claim 1 or claim 2, characterized in that said coating (2) of said coating carrier (6) is made of paper, thin paper, or polyvinyl chloride laminate.
4. The board of claim 1, characterized in that said board (1) is formed as a fiberboard of medium density (MDF board) having applied thereon a thin, sheeting-like design coating (2) composed of wood or paper.
5. The board of any of claims 1 to 4, characterized in that said board (1) is designed as a hollow structure formed by a frame composed of ledges (19, 20), said ledges (19, 20) defining a hollow space (18) therebetween, which space (18) is covered by a supporting material (layers 22 to 24) carrying said coating (2).
6. The board of any of claims 1 to 5, characterized in that the shape of said supporting material (layers 22 to 24) connected with said board (1) is thinned at least in the area of said postforming edge (16) and that, here, said postforming edge (16) is only made up by the thinned area of said supporting material (layer 22) together with said external coating (2) associated thereto.
7. The board of any of claims 1 to 6, characterized in that, in the area of said postforming edge (16), said coating carrier (6) has a thickness in the range of 0.1 to 1 mm .
8. The board of claim 1, characterized in that said coating (2) of said coating carrier (6) is made of a thin wooden veneer.

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