DK152572B - MIRRORING, PLATE-SHAPED FORMULA MEMORIAL PRODUCTS AND PROCEDURES FOR PRODUCING THEM - Google Patents

Description

DK 152572 B

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirrored, plate-shaped plastic semi-product consisting of a thermoplastic support, a metal coating, an adhesive layer between the support and the metal coating, and a polyester layer 5 over the metal coating.

Such material is known from German Publication No. 2,147,510. The mirror plate-shaped plastic semi-finished product is produced by an injection molding method, that is, only the manufacture of relatively small objects is possible. For many applications, however, large mirror surfaces are required, such as for the shading of bar shelves in cabinets or for the production of display elements for advertising. In both cases, relatively large 15 mirror surfaces must be produced, which however cannot be easily done by injection molding.

In addition, from German Publication No. 2,333,752, a metal printable moldable semi-finished product is known, which can be subjected to a strong depth drawing. The use of metal imprinting results in a low reflection effect which is not sufficient for producing mirrored surfaces. This known plastic semi-finished product has a thermoplastic support material on which is adhered a printed backing caching foil.

Further, British Patent Specification No. 1,399,624 discloses a decorative multilayer sheet having a durable, translucent surface layer of a biaxially oriented polyethylene terephthalate film. An adhesive metal layer is placed on the back side of this foil. This plastic semi-finished product is manufactured discontinuously from the prepared single layers which are connected to each other.

Finally, from German Patent Publication No. 1,932,890, a process for the production of planar building elements is known, by which, on an extruded polyethylene sheet, plastic film is rolled and then

DK 152572B

2 metal plates under pressure and heat.

It is the object of the present invention to provide a reflective plastic semi-finished product of the kind set forth at the outset, which can be manufactured with 5 high quality optical properties as well as in large surfaces, and which is moldable without deterioration of the optical mirror quality.

This is achieved according to the invention in that the polyester layer has a thickness of 12 µm, that the side facing the adhesive layer of the metal coating has a layer of protective lacquer and that the carrier consists of an extruded resin.

The proposed measure achieves first and foremost that this semi-finished fabric has the desired optimum optical properties, to which in particular the use of extremely thin, transparent polyester layers contributes.

Namely, such polyester layers made of foil cannot be made of regular thickness, but generally have a somewhat wavy surface; with relatively thick polyester layers, this wavy surface has a relatively large influence on the reflection, resulting in a blurred, deteriorated mirror image. However, when using polyester layers having a maximum thickness of 12 microns specified herein, the waveform also present here can no longer be observed so that the image does not deteriorate twice through the polyester layer twice and consequently high quality mirror images are obtained.

This is particularly important for the use of this material, for example for shop window decoration, at trade fairs, etc., where this mirror effect is inserted in connection with an additional pressure to obtain special effects. As a protection against mechanical and / or chemical influence, the highly sensitive, generally evaporated, metal coating is coated with a protective coating layer. This metal coating retains both its original optical properties after long storage before manufacture of plastic semi-finished product and after long use, so that its reflectivity and thus mirror effect.

DK 152572B

gene of the finished plastic semi-finished product is not adversely affected.

Since an extruded resin is used as a carrier and this carrier is already available on a large surface, the other layers, which must be capable of being manufactured as separate units, need only be applied to this carrier to obtain the desired large surface mirror surface. Such a laminate can be produced by a continuous process such that, in comparison with the known manufacture of separated parts, a substantial reduction in the cost per unit of weight is obtained. unit area.

The present invention also relates to a process for the manufacture of the semi-finished product.

A method is used in which the metal coating is applied to the polyester layer and provided with the adhesive layer and this laminate is joined to the support. Such a method is also known from German Publication No. 2,147,510.

This method is carried out in accordance with the second part of the present invention in that a polyester film of up to 12 µm thickness is used, that the metal coating is provided with the base coating lacquer prior to application of the adhesive layer and that the bonding between the laminate and the carrier is continuous the laminate is cached on the plastic carrier material coming out of a wide-gap nozzle by means of a smoothing calender.

By the proposed method, it is achieved that the plastic carrier material coming out of the wide gap nozzle already has sheet form and therefore does not need to be further processed and in particular not deformed, but that the separately manufactured laminate out of the other layers merely needs to be cached on it. plate-shaped support material.

Thus, in practice, only two separate 35 workflows are necessary, namely for the first manufacture of laminate and secondly for coating this laminate by means of the smoothing calender on the extrudate of the

DK 152572B

4 wide split nozzles. As mentioned above, this continuous process is carried out much more easily and thus at a lower cost than the discontinuous manufacture of such a laminate by single-mold injection molding. Furthermore, there is no need to add additional adhesive to the bond between the laminate and the carrier material since the adhesive layer is already on the prefabricated laminate.

Advantageous embodiments of the method of the present invention are set forth in claims 3 and 4. The method of claim 3 provides a better adhesion between the metal coating and the polyester film than otherwise. For the matte side of the polyester foil, it is important that it does not come into contact with the calender during calendering and therefore has a very fine, rough surface structure which leads to the intended matte appearance. This fine surface structure of the matte side, due to its roughness, gives a larger specific surface and thus a better bond between the polyester foil and the metal coating.

As an adhesive, according to a preferred embodiment, an elastomer is used, as this material fits very well to the metal coating or thermoplastic carrier and thus leads to a very good bonding between these two layers.

In the following, an exemplary embodiment is described with reference to the drawing, the only figure of which, in improper scale, shows a section through a mirrored, plate-shaped plastic semi-finished product.

As can be seen in the figure, the plastic semi-finished product indicated by reference number 1 is made up of a 12-inch thick polyester foil 4, whose gloss side is indicated by 3 and whose matte side 5 has a metal coating 6, which is made, for example, by evaporation of an aluminum layer.

35 The transparent polyester foil 4 serves as the carrier material for the manufacture of the plastic semi-finished product 1.

DK 152572B

metal coating 6 and later, also in the finished plastic semi-finished product 1, as a mechanical protective layer.

The metal coating 6 is coated on the side facing away from the mat side 5 of the polyester foil 4 with a 5 layer 7 of a protective lacquer. The surface of the varnish layer 7 facing away from the metal coating 6 is provided with an elastomer-based adhesive layer 8. This adhesive serves to coat the laminate consisting of the metal coating, the polyester foil and the adhesive layer, 10 on a thermoplastic moldable support 9, the thickness of which should be between 1 and 6 mm, and such that the plastic semi-finished product, whose reflective side is designated 2, is given the necessary mechanical stability.

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Claims (4)

1. Mirrored, plate-shaped plastic semi-fabric consisting of a thermoplastic support, a metal coating, an adhesive layer between the support and the metal coating and a polyester layer over the metal coating, characterized in that the polyester layer (4) has a thickness of up to 12 µm, that the metal coating (6) on it facing side of the adhesive layer (8) has a layer of protective lacquer (7) and the carrier (9) consists of an extruded resin. A method of preparing a semi-finished cat as claimed in claim 1, wherein the metal coating is applied to the polyester layer and provided with the adhesive layer and this laminate is bonded to the support, characterized in that a polyester film having a thickness of up to 12 µm is used. that the metal coating is provided with the protective lacquer prior to application of the adhesive layer and that the bonding between the laminate and the carrier is continuous by caching the laminate on the plastic carrier material coming out through a wide gap nozzle by means of a smoothing calender. Method according to claim 2, characterized in that the metal coating is applied to the mat side of the polyester film. Method according to any one of the preceding claims, characterized in that an elastomer is used as an adhesive. 30 35