SE428812B - Pattern paper designed for manufacture of laminate - Google Patents

Abstract

Pattern paper designed primarily for the manufacture of high- pressure laminate, low-pressure laminate or directly laminated boards. The paper surface is equipped with a relief pattern and possibly a decor print where the relief pattern, completely or in part is adapted to the decor print. On the reverse of the paper the relief pattern is filled with a composite containing curable resin.

Description

isoianeåa On top of the pattern sheet is usually a so-called transparent sheet as the top protective layer.

Directly laminated boards are produced analogously to low-pressure laminate. However, the various sheets of paper are then pressed firmly against a carrier which may consist of, for example, a chipboard or a fibreboard.

When pressing high-pressure laminate, low-pressure laminate and directly laminated boards, the various press packages are placed between press plates. The press plates usually lie against the front of the produced laminate. The press plates are often treated so that their surface and thus also the surface of the laminate or the directly laminated board becomes smooth.

For many uses, however, it may be desirable that the surface of the product produced is not smooth but provided with a relief pattern in some form.

Such a pattern can be achieved by corresponding surface treatment of the press plates between which the pressing takes place. This process is very costly and is therefore only used in the production of laminates in large series. Another more economical way of producing plastic laminate with a relief-patterned surface is shown in Swedish patent 314,616. According to this, a relief-patterned metal foil is used as the matrix.

By adapting the relief pattern on the matrices or press plates to the pattern on the decorative sheet in the laminate, an attempt has been made to achieve a correspondence between these two patterns. However, no satisfactory result can be obtained with that method. This is due i.a. that the pattern of the matrix and the plate, respectively, are the same from disc to disc. However, the pattern on the paper shifts due to cutting and varying sheet length. Even if the sheets were cut so that they matched the pattern on the matrices or press plates, it would be impossible to place the sheets so that a perfect match was obtained between the patterns.

In addition, when handling the press packages before pressing, the sheets would probably move at least a few millimeters, which is sufficient for the appearance result to be significantly impaired. In addition, said pattern-adapted cutting of the decorative sheets would cause far too great a cost due to discarded material. 3 There is thus a great need to be able to manufacture, for example, a plastic laminate with a relief-patterned surface that is perfectly adapted to a decorative print on the laminate.

The present invention has been able to meet said needs and provide a pattern paper, mainly intended for the manufacture of high-pressure laminates, low-pressure laminates or direct-laminated boards, which paper is provided with a relief pattern and possibly a decorative print, whereby the relief pattern is wholly or partly adapted to the decorative print. The pattern paper is characterized in that the relief pattern on the back of the paper is filled with a composition containing a curable resin.

The composition used must be selected so that it does not adversely affect the properties of the resin used for impregnation of other sheets of paper included in the laminate, etc.

The most common resins used for this purpose are, as above, phenol-formaldehyde resin and melamine-formaldehyde resin. To some extent, polyester resin is also used.

It is at least in some cases suitable that the pattern sheet according to the invention is resin impregnated. Melamine-formaldehyde resin or polyester resin is advantageously used. Other resins may also be used.

The composition used to fill the back of the relief pattern preferably consists of a putty containing phenolic resin, melamine resin, urea resin, polyester resin or other similar resins or resin mixtures containing two or more of these resins.

The pattern-filling composition can be applied to the back of the pattern paper in many different ways, e.g. by means of coating, rolling, curtain painting, filling, doubling and the like. How the composition is applied, however, is irrelevant to the invention.

By filling in the relief pattern on the back of the pattern paper in the manner described, the relief structure on the surface of the produced laminate is maintained. The high pressing pressure is thus not able to squeeze out the relief structure. 7907406-8 7907¿. = IÛ6-8 The pattern paper according to the invention is used in the same way as the previously described pattern papers.

The relief pattern and the decorative print on the pattern paper can be adapted to each other according to a technique which is known per se from the wallpaper industry.

It therefore seems unnecessary to describe this here.

It is obvious that the present invention provides most of the advantages when the pattern paper as above is provided with a relief pattern which is adapted to a decorative print on the paper. It is clear, however, that the invention also offers certain advantages when the two patterns are smaller or not at all adapted to each other or when the decorative print is unpatterned. The methods described above where patterned press plates or matrices are used can of course be avoided, which results in a simpler and certainly more economical production. The invention is further explained in connection with the following exemplary embodiments. i Example On the back of a melamine resin impregnated pattern paper sheet, which was provided with a relief pattern which was completely adapted to a decorative print on the paper, a putty based on phenolic resin containing hardener was applied.

The relief pattern was then completely filled. The putty was then brought to cure. then a release layer consisting of a silicone paper sheet or an aluminum foil, a suitable number of backing sheets impregnated with phenolic resin, the above pattern paper sheets, if necessary an overlay layer of melamine resin impregnated paper, a release layer consisting of for example a silicone foil sheet or an aluminum foil sheet were placed on top of each other. press pad consisting of a rubber cloth and a press plate. The above press package was placed in a press and pressed at a pressure of 100 kp / cm 2 and a temperature of 145 ° C. Veuvnosfß A laminate plate was obtained with a relief-patterned surface which completely corresponded to the decorative pattern.

The invention is not limited to the embodiments shown, as these can be modified in various ways within the scope of the invention.

Claims (3)

7907406-e PATENTKRAV 1. Pattern paper, primarily intended for the production of high-pressure laminates, low-pressure laminates or direct laminated sheets, which on the surface is provided with a lintel pattern and possibly a decorative print, the lattice pattern being completely adapted to the design. the back of the paper is filled with the grain position containing a curable resin. Pattern paper according to claim 1, characterized in that the reef pattern on the back of the paper is provided with a composition consisting of a spacer resin, phenolic resin, urea resin, resin resins and other resin resins. Pattern paper according to Claim 2, characterized in that the paper is impregnated with, for example, melamine-formamide hydride resin or polyester resin. 7907406-8 SUMMARY Pattern paper primarily intended for the production of high-pressure laminates, self-printing laminates or directly laminated boards. The surface of the paper is provided with a relief pattern and possibly a decorative print, whereby the rehef pattern heït eHer deïvis is adapted 1: 1 '11 the decorative print. The strip pattern is formed on the back of the paper with a composition containing a curable resin.