DE10018103A1 - Multi-layer film with a radiation hardenable paint useful for substrate coating, includes a decorative paint coating and an adhesive and reduces costs in production of painted products and avoids expensive maintenance costs - Google Patents

Abstract

A multi-layer film with at least two coatings: a carrier (10) with release properties, carrying a thermoplastic moldable and hardenable paint (12) and an adhesive (16) is new. Independent claims are included for: (1) preparation of the film by extrusion of paint (12) onto carrier (10) and application of adhesive (16) to paint (12); (2) preparation of the film with paint (12) in melted powder form; (3) preparation of the film with paint (12) in granulated form, extrusion of the granulate, melting of the granulate, and extrusion onto the film as a layer; (4) coating of a substrate (18), with deposition of a film onto the substrate under the action of pressure or heat. Paint (12) is radiation hardened after forming especially by UV radiation.

Description

The invention relates to a multilayer film with curable Varnish, a process for making such a film and the Use of the same for coating a substrate.

In the prior art, colored decorated products (sub strate) usually painted, whereby the paint at demanding fuller products of radiation curing, especially with UV radiation. This requires the manufacturer the product some effort with regard to the plants and the Procedure.

The invention has for its object the effort Manufacture to reduce painted products.

According to the invention, a multilayer film is provided for this with at least the following layers:

• - a carrier with "release" property,
• - a thermoplastic, hardenable lacquer, and
• - an adhesive.

With such a film, the manufacturer of a product be supplied. He can apply the film to the paint and if applicable, place the product (substrate) to be decorated and overall adapt the film to the shape of the substrate, wherein the thermoplastic deformability of the paint this adjustment promotes. After the film with the varnish and adhesive formge If the paint is applied precisely to the substrate, it can be exposed to radiation be cured. Before or preferably after curing, the Carriers with a "release" property are peeled off the paint.

The so-called "release" technique is known as such (e.g. EP 0 573 676 A1). As a flat beam with "release" - Properties come into consideration in particular papers and also  Plastic films that are prepared on their surface so that applied layers of paint or varnish in the manner of a "Peeling off" (like a decal) transferable to a substrate are. As such, this is known to the person skilled in the art.

The technique described above enables high quality Painting a product, being the manufacturer of the product no complex painting systems and also no complex Must keep stocks of paint. Much more the film described is delivered to him. The film allows a homogeneous application of the paint with relatively little effort resources.

According to a preferred embodiment of the invention, the multilayer film between the paint and the adhesive a color de kor location on. Thus, the product ultimately to be manufactured not only painted with the film but also easier Be decorated in color in a single operation, under a "colored decoration" here also a monochrome ges decor or a wood representation or the like is meant.

The powder coatings known as UV-curable can be mixed with the usual additives are used, preferably unsaturated Polyester or acrylated polyacrylates.

Polyurethane glue, polyacrylate glue are preferred as glue over or polyolefin glue used.

According to a further preferred embodiment of the film the carrier is selected so that it for that radiation with that the paint is curable, is permeable. This has the intent partly that the film can remain on the substrate as long as until curing is complete. This is done as a carrier preferably PVA (polyvinyl alcohol) used.

The invention also teaches a method of making a multilayer film in which on a carrier with "release" -  Property a thermoplastic deformable, radiation curable rer lacquer is extruded and an adhesive is applied to the lacquer will wear.

This method can be used with a conventional extruder Slot nozzle are executed. The paint is preferred still in granulate form (not as a powder) into the extruder entered and melted. The use of the paint as Granules simplify and make the process cheaper.

The invention also includes a method of coating a product or substrate in which a film according to a of claims 1 to 6 under pressure and / or heat the substrate is applied and the varnish after thermoplastic shear deformation with radiation, especially UV radiation, is hardened. As already indicated above, the Carrier preferably only peeled off after the paint has hardened, see above that until then it will be available as a protective layer.

An exemplary embodiment of the invention is described below View of the drawing explained in more detail. It shows:

Figure 1 shows schematically a section through a film.

Fig. 2 shows schematically the application of a film according to Fig. 1 on a substrate.

A carrier 10 with a "release" property (peeling ability) is provided in a manner known per se, e.g. B. a "Relea se" carrier made of PVA.

A varnish 12 is applied to the carrier 10 , here a fusible, UV-curable varnish, preferably of the type mentioned above.

The thickness of the carrier 10 and the thickness of the lacquer layer applied depend on the product ultimately to be lacquered.

The paint can e.g. B. applied as a powder to the film and be melted. It can also be used in an extruder Slot die can be extruded directly onto a finished film. The lacquer in granular form is preferably introduced into the extruder give.

A color decor 14 is applied to the lacquer (not absolutely necessary if the product is only to be lacquered).

When using a color decor, the paint 12 is preferably chosen to be transparent.

All the layers described here, in particular the colored decor layer 14, can be applied using the "release" technique. For example, the color decor can be "released" from a film of polypropylene on the lacquer layer. It is preferred to work at a somewhat elevated temperature, which improves the adhesion of the color decor to the lacquer layer.

If no color decor is provided, the lacquer can be preferred be colored.

The carrier film 10 can preferably be embossed, ie on its side facing the lacquer 12 the surface of the carrier film 10 has a structure, that is to say is not smooth. This structure is then transferred to the lacquer 12 . So z. B. a wood structure in the paint 12 are generated.

It is also possible to roughen the surface of the carrier film 10 or to provide it with a very fine structure, specifically on the side facing the paint. This ultimately results in a matting of the lacquer in the end product without the need for special matting agents.

An adhesive layer 16 is applied to the color decor 14 , preferably of the type specified above.

The film thus produced according to FIG. 1 can be handled and transported as such. It can be used to paint products (sub strate) and to decorate them if necessary. This is shown schematically in FIG. 2.

The substrate 18 can have a relatively complicated 3-dimensional shape. The film of FIG. 1 with the adhesive 16 at the bottom placed on the substrate. In this case, a pressure difference p is preferably generated in order to apply the film overall to the substrate 18 with a precise fit and shape. For example, in a membrane press, a membrane (not shown) can be placed over the film (which is known as such) and by applying pressure through the membrane and / or by creating a vacuum on the underside of the membrane using the membrane be applied to the substrate 18 . The temperature of the film is increased so that the adhesive develops its adhesion. The temperature increase is set so that the paint 12 conforms thermoplastic precisely to the contours homogeneously. At this time, the paint 12 has not yet hardened.

After the film according to FIG. 2 is placed exactly on the substrate 18 and is at least partially already glued, the lacquer 12 can be cured with radiation S, for. B. UV radiation or electron beam.

Claims (11)

1. Multi-layer film with at least the following layers:

• - a carrier ( 10 ) with "release" property,
• - Thereon a thermoplastic deformable, curable lacquer ( 12 ), and
• - an adhesive ( 16 ).

2. Film according to claim 1, characterized in that between the paint ( 12 ) and the adhesive ( 16 ) is a color decor layer ( 14 ). 3. Film according to one of claims 1 or 2, characterized in that the lacquer ( 12 ) is an unsaturated polyester or an acrylated polyacrylate. 4. Film according to one of the preceding claims, characterized in that the adhesive ( 60 ) is a polyurethane adhesive, polyacrylate adhesive, or polyolefin adhesive. 5. Film according to one of the preceding claims, characterized in that the carrier ( 10 ) for radiation with which the lacquer ( 12 ) is curable is permeable. 6. Film according to one of the preceding claims, characterized in that the carrier ( 10 ) consists of PVA. 7. A method for producing a multilayer film, in which a thermoplastic plastic, radiation-curable lacquer ( 12 ) is extruded onto a carrier ( 10 ) with a "release" property and an adhesive ( 60 ) is applied to the lacquer ( 12 ) . 8. A method for producing a multilayer film, in which a thermoplastic, radiation-curable lacquer ( 12 ) is applied in powder form and melted onto a carrier ( 10 ) with "release" property. 9. A process for producing a multilayer film, in which a thermoplastic plastic, radiation-curable lacquer ( 12 ) in granulate form is introduced into an extruder on a carrier ( 10 ) with "release" property and, after melting, is extruded onto the film as a layer . 10. A method for coating a substrate ( 18 ), in which a film according to one of claims 1 to 6 is applied to the substrate ( 18 ) under the action of pressure and / or heat and the coating ( 12 ) after thermoplastic deformation with radiation ( 5 ), in particular UV radiation, is cured. 11. The method according to claim 10, characterized in that the carrier ( 10 ) is removed after the curing of the lacquer.