DE102008030572A1 - Multi-layered veneering system for adorning part, comprises a carrier layer, which is sectionally equipped with a veneer, two supporting layers, which are separated from one another and strengthen the veneering system - Google Patents

Abstract

The multi-layered veneering system comprises a carrier layer (10), which is sectionally equipped with a veneer, two supporting layers (12.1, 12.4), which are separated from one another and strengthen the veneering system, and a decor layer (16), which determines the surface image of the veneering system. The supporting layers are formed from same technical paper materials, which are impregnated with urea-, melamine- and phenol resin, which allows pasting of the paper materials with one another also with a carrier layer and/or the decor layer. The multi-layered veneering system comprises a carrier layer (10), which is sectionally equipped with a veneer, two supporting layers (12.1, 12.4), which are separated from one another and strengthen the veneering system, and a decor layer (16), which determines the surface image of the veneering system. The supporting layers are formed from same technical paper materials, which are impregnated with urea-, melamine- and phenol resin, which allows pasting of the paper materials with one another also with a carrier layer and/or the decor layer. A stabilizing layer (14) is applied between two supporting layers and made of plastic or aluminum with a strength of 0.1-0.8 mm. A cover layer made of polyester lacquer or polyurethane lacquer with a strength of 0.5-1.5 mm is applied on the decor layer. The carrier layer consists of plastic material and/or metal and is formed through rear-injecting the decor layer strengthened by the support layers in the veneering system. The strength of the carrier layer is 1.5-4.5 mm and/or the support layer is 0.1-1 mm and/or the decor layer is 0.1-1.0 mm. An independent claim is included for a method for the production of multi-layered veneering system for adorning part.

Description

TECHNICAL AREA

The This invention relates to a multi-layer veneer system for trim parts according to the preamble of claim 1. Furthermore, the invention relates to a trim part and a method of manufacturing a multi-layer veneer system.

STATE OF THE ART

Trim, especially for use in vehicles today often include one Decorative shell, for example made of multilayer sandwich construction, for example, noble veneer and several connected by glue films Blind veneer layers and if necessary with one or more additional ones Intermediate layers is constructed. A decorative shell can additionally one carrier on which a certain number of blind veneer layers if necessary, one or more stabilization layers and further a further number of blind veneer layers the stabilizing layers. On the further number of blind veneer layers is finally a decorative layer, wherein on the decorative layer, if necessary, another surface coating can be applied.

The individual blind veneer layers are with each other with glue films connected and can on a carrier also z. B. be firmly applied by glue. The number of Blind veneer layers hang thereby on the geometry and the dimensions of the component from, wherein as needed as additional Stiffening corresponding stabilizing layers (for example Aluminum sheets) are integrated in the layer system.

At the previous layer structure are used blind veneers, the Raw veneer by joining on the needed Sizes brought Need to become. About that addition, it is necessary Condition the blind veneers to process-conforming parameters and to grind to limit manufacturing tolerances. These processes are expensive and expensive, but necessary, because riots, blindfolds, For example, bumps, arise on the surface of the layer structure can. Such surface disturbances occur in the case of back injection of the layer structure with a Plastic carrier even reinforced on. This can have various reasons. For one thing on the back side the carrier part Tying elements for fixing the trim part in the vehicle available be. These can be through the force acting on them on the surface of the trim deformations create, where the paint towards the interior of the trim part drops the surface So a vault having. It is also possible, for example, for injection molding the carrier part small bulges on the surface of the trim part arise. This can arise, for example, that in the injection mold plastic under very high pressure the backside the veneer layers is fired so that these in places the impact of the plastic additionally compressed and after Outside pushed away can be. Furthermore, can Different density zones of the top veneer and the blind veneer on the paint surface depict.

It is so far a big one Need effort, for the smoothness of a trim part used in vehicles, for example to reach the expected high level. The Production of a trim piece with a corresponding veneer layer is therefore very complex.

PRESENTATION OF THE INVENTION

task Accordingly, it is the object of the present invention to provide a multi-layer veneer system for trim parts, a corresponding trim part and a method for producing a To develop a multi-layer veneer system in an efficient way one possible smooth surface a decorative part allows.

These solution The object is solved by the features of claims 1, 10 and 11. at a multi-layer veneer system for decorative parts according to the invention is at least one of the support layers made of technical paper material. Unlike standard paper the technical paper is more stable, making it a support layer for a Multilayer veneer system is suitable. The cause of the stiffened execution of the technical Paper can in particular be at least partially impregnated a Kraft paper, an at least partially coating a Kraft paper with a stabilizing substance, such as a Resin, or an at least partially soaking a Kraft paper in a corresponding liquid be that increased stability of the soaked in it Kraft paper leads.

The inventive design of the multi-layer veneer eliminates the need for processing the raw veneers. Furthermore, the blind veneers do not need to be further conditioned, and even grinding of the blind veneers can be dispensed with when using technical paper material as support layer for at least this replaced layer. Also, the formability of the veneer system can be further optimized due to the better flow behavior of the intermediate layers compared to blind veneers. All this has the consequence of requiring less effort to minimize surface roughness or unevenness of the veneer system. Technical papers have the advantage, in addition to blind veneers, that they are available as rolled goods whose width can be tailored to the required dimensions, thereby enabling efficient processing of the technical paper. Furthermore, such technical papers have a substantially consistent quality in terms of their strength, Beharzung, the carrier material or the like. In contrast to the veneer, which is used as a blind veneer, a technical paper is a neutral layer material that is essentially isotropic. Finally, the technical papers are not hygroscopic and thus more dimensionally stable under weather conditions than blind veneers.

One further advantage of the veneer system according to the invention in that the undesirable Splinter behavior in the event of an impact is improved as only even the top veneer may splinter while the technical papers are splitting unlike blind veneers do not tend to splinter breaks.

With Advantage are several, in particular all support layers in particular formed the same technical paper material. In such a embodiment Thus, several of the previously executed as blind veneer layers support layers formed by the technical paper material. Preference is given here all support layers formed from the technical paper material to the advantages of full use of technical paper material. Especially preferred the technical paper material layers are the same formed technical paper material, so that the resulting multi-layer veneer system can be made particularly efficient. But it is also possible, Technical paper material of different types in the same multi-layer veneer system to use, for example, different specific properties individual technical paper grades.

Prefers is the technical paper material with a resin material, in particular urea, melamine or phenolic resin impregnated, which is a bonding of adjacent layers of the paper material with each other, preferably also with the carrier layer and / or the decorative layer allowed. Such a technical paper material has the advantage that it is flexible before and after reaching a certain temperature, So at a temperature above the certain temperature, stiffening is. This particular temperature is common in the processing of multi-layer veneer systems achieved in a pressing process, whereby this preferred multi-layer veneering system ago a pressing flexible and stiffening after pressing is. Moreover, such a technical paper is not further after curing compressible. This creates a uniform shell thickness of Multilayer veneer system above the carrier, in particular during subsequent Processing steps is maintained. By pressing it is technical paper material with the resin material for stiffening the Veneer system suitable without the described disorders or Unevenness of the surface become visible. Preference is given to the use of low-emission Paper materials with a low content of volatile components.

With Advantage is between the at least two support layers optionally one Stabilization layer, preferably of plastic or metal, especially preferably of aluminum, in particular with a thickness of between 0.1 mm and 0.8 mm can be introduced. Such a stabilizing layer may be a needs-based stable design of the multi-layer veneer system enable. However, this is not the case with all applications of the multi-layer veneer system necessary, may also apply to a corresponding stabilizing layer be waived. On the top and / or bottom of the stabilization layer can one or more support layers lie. It is also conceivable, for example, that those Support layers, which are applied above the stabilizing layer, through the technical paper material is formed whereas those support layers, which are applied below the stabilizing layer, from a other material can be made. stabilization layers made of plastic or metal are mainly characterized by that they are easily manufactured and provided with a high stability are. Here aluminum is a particularly light metal one particularly preferred choice of the material of the stabilizing layer.

With Advantage is a topcoat on the decorative layer, preferably substantially polyester-based or polyurethane-based. The topcoat preferably has a strength from between 0.5 mm and 1.5 mm. Such a layer of a topcoat can the decorative layer effective against external influences, For example, protect from scratches or sunlight. For this Particularly suitable are the relatively cheap materials polyester or Polyurethane. These are about it In addition, also very good workability, so that a topcoat can help to create a very smooth surface of the veneer system. For particularly large Strengthen above 1.5 mm, the optical effect of the decorative layer increasingly lost, whereas at smaller thicknesses than 0.5 mm smears in the protective effect of the topcoat are to make. In general are however, topcoat thicknesses of almost any size possible.

alternative can on the decorative layer as a surface coating a film be arranged with the help of an adhesive with the decorative layer is connected. The film is preferably one Foil made of PC, PMMA or a PC-PMMA combination foil. Of course they are also films made of other materials conceivable. Preferably, the Foil transparent or translucent (translucent).

In a further alternative embodiment can on the decorative layer as a surface coating a surface finishing agent be applied. The surface finishing agent has the function to influence the visual appearance of the decorative layer and / or the stability and the integrity to improve the decorative layer. In the surface finishing agent can it is a color enhancer. Alternatively, this can also - an open-pore Paint or impregnation agent (eg a wax or an oil) be used.

In a preferred embodiment contains the carrier layer Plastic material and / or metal. Depending on the version of the carrier layer can thereby different processing processes for the production of the Multilayer veneering be provided, for example, casting, injection molding or known forming process. It is also possible that the carrier layer contains both plastic material and metal. The carrier layer may, for. B. of magnesium die casting consist.

With Advantage is the carrier layer doing so by injecting the starched by the support layers decorative layer can be integrated into the multi-layer veneer system. It can by the support layer strengthened Decorative layer to be back-injected by plastic in the cold Condition the carrier layer can form. For this purpose, known Injection molding can be applied, reducing the manufacturing cost of the multi-layer veneer system can be kept low. A back injection with liquid Metal is due to the high temperatures, the liquid metal usually has not possible. In one embodiment of the Multilayer veneering system in which the carrier layer is covered by a metal or at least partially formed by a metal, the Support layer, the to the carrier layer connects, with the metal part of the carrier layer For example, be glued. A plastic part or an entire Plastic carrier layer can by contrast by injecting the lowest support layer be integrated into the multi-layer veneer system. Alternative and additionally However, it is also possible plastic parts a carrier layer with the lowest support layer to glue or otherwise secure.

With Advantage has the carrier layer a strength between 1.5 mm and 4.5 mm and / or each of the support layers a strength of between 0.1 mm and 1 mm and / or the decorative layer has a thickness of between 0.1 mm and 1.0 mm. Such a division of the strengths of individual layers of the multi-layer veneer system has proved to be one efficient and stable construction. The layer thicknesses of However, individual layers of the multi-layer veneering system can also outside the said intervals lie. These intervals, however, will for one particularly good visual impression, haptic properties and strength values the veneer system preferred.

One Decorative part according to the invention comprises a multi-layer veneering system based on one of those described above Ways is.

In a method according to the invention for producing a multi-layer veneer system, the support layers become connected by pressing together and stiffened. The pressing of the support layers is possible because the support layers can be formed before a pressing process and only after the pressing process stiffened.

Prefers become the support layers by pressing in addition connected to the decorative layer. This advantageous embodiment the method according to the invention makes use of the property of the support layers that these stiffen after compression and during pressing with a able to connect adjacent layer assets. Especially the top one support layer may contact with the decorative layer during compression with this connect.

advantageously, the carrier layer is through Injecting the compressed support layers into the multi-layer veneer system brought in. It may therefore be advantageous that the first Support layers, preferably pressed with the decorative layer and stiffened, while the carrier layer, if it is made of plastic, behind the already existing ones Layers of multi-layer veneer system is injected. The back injection can, for example, by conventional Injection molding techniques performed become. In a carrier layer of a metal, however, other methods for introducing the backing to apply in the multi-layer veneer system.

In an alternative advantageous embodiment of the method according to the invention, the support layers are additionally connected by pressing with the carrier layer. This advantageous embodiment of the method is particularly in the apply to such carrier layers, which can not be introduced by injecting the already pressed support layers in the multi-layer veneer system. This applies, for example, to carrier layers of metal, wood or non-sprayable plastics.

The inventive multi-layer veneer system has a higher overall Surface quality on, so that process steps such as paint grinding and polishing no longer required are. this leads to to noticeable reductions in the production cost of trim parts using the multi-layer veneer system according to the invention across from Trim pieces with a conventional Veneer equipped are. As the technical paper, which according to the invention for use comes, after curing no longer appreciably compressible results in a uniform shell thickness of the multi-layer veneer system, which also through a curing the support layers subsequent injection step is no longer changed. In the conventional Veneering systems were able to due to pressure differences caused by the back molding occur, surface irregularities are generated, that the overall impression of the covered with the multi-layer veneer system Could adversely affect trim parts.

BRIEF FIGURE DESCRIPTION

1 shows a multi-layer veneer system for trim parts in a sectional view;

2 shows a perspective sectional view of another multi-layer veneer system.

PREFERRED EMBODIMENT

1 shows a multi-layer veneer system for trim with a carrier layer 10 , two layers of technical paper 12.1 . 12.2 , a stabilizing layer 14 , another two layers of technical paper 12.3 . 12.4 , a decorative layer 16 and a surface paint layer 18 ,

The in 1 represented carrier 10 is made of a plastic that can be sprayed and has a thickness of approx. 3 mm. On the carrier are two separate layers of technical paper 12.1 . 12.2 applied and with each other and with the carrier material 10 connected. The joining of the technical paper 12.1 . 12.2 with the carrier material 10 is done by pressing. The technical paper used here 12.1 to 12.4 is a resin-impregnated kraft paper whose resin cures during compression. The resin may preferably be a phenolic resin or a melamine-phenolic resin combination. Such kraft paper is available, for example under the name COVER RIGHT ^® TFU 090 or COVER RIGHT ^® TPU 809th

The COVERRIGHT ^® TFU 090 is an approx. 0.3 mm thick kraft paper with a paper weight of 135 g and a resin content of 280 g. The cover RIGHT ^® TPU 809 kraft paper has a layer thickness of 0.2 mm and has a paper weight of 75 g at a resin content of 180 g. The mass ratio of resin to paper is thus somewhat larger in the case of TPU 809. In contrast to the TFU 090, this kraft paper is impregnated with a pure phenolic resin, which, compared to a melamine-phenolic resin combination, means increased flexibility of the kraft paper before compression.

Those on the two layers of technical paper 12.1 . 12.2 applied stabilizing layer 14 is to be applied only when necessary and leads to an additional stability of the multi-layer veneer system. In the example shown here, the stabilization layer is an aluminum layer having a thickness of 0.3 mm. The connection between the stabilization layer and the underlying layer of engineering paper 12.2 It also takes place via the pressing of the multi-layer veneer system.

Above the stabilization layer there are again two layers of technical paper 12.3 . 12.4 , of their type the first two layers of technical paper 12.1 . 12.2 correspond and also by pressing together and with the stabilizing layer 14 are connected.

On topmost layer of technical paper support layer 12.4 is the decorative layer 16 applied. The decorative layer is formed by a 0.4 mm thick noble veneer layer, the surface of which is ground smooth. The decorative layer is with the topmost backing layer of technical paper 12.4 by compression, and further has a surface finish on its surface 18 which is formed by a 1 mm thick polyurethane (PUR) film. The surface layer of polyurethane serves in particular to protect the decorative layer 16 , and allows an additional leveling of any existing unevenness of the surface of the decorative layer 16 ,

2 shows a perspective view of a stepwise sectional view of another multi-layer veneer system. As 1 this figure also shows a carrier layer 10 , which is formed by a plastic about 3 mm thick. On it are two support layers of technical paper 12.1 . 12.2 by pressing together with each other and with the backing layer 10 connected are. The strength of the respective technical papers 12.1 . 12.2 is here as in the example of 1 0.2 mm. On the first two layers of the technical paper support layer 12.1 . 12.2 is the stabilization layer 14 , which consists of an approximately 0.3 mm thick aluminum sheet. Also, the aluminum sheet is by pressing with the upper backing layer of the technical paper 12.2 connected by pressing. On the stabilization layer 14 is again a support layer 12.3 applied as described above by compression with the stabilizing layer 14 is connected, this further support layer 12.3 like the first two layers of support 12.1 . 12.2 made of 0.2 mm thick technical paper. Then they are already in 1 shown and described there layers of decorative layer 16 and surface paint layer 18 ,

2 shows in contrast to 1 on the one hand, an embodiment of the multilayer system with only one above the stabilizing layer 14 located support layer 12.3 and on the other hand, in addition, that the multi-layer veneer system is extended flat. The veneer system can be used for the production of almost arbitrarily shaped trim parts and thus creates a particularly high-quality impression of the trim part.

The in the 1 and 2 illustrated embodiments of the multi-layer veneer system for trim can of course be varied. For example, it is also preferred that between the carrier 10 and the stabilizing layer 14 three 0.2 mm thick layers of technical paper are present. Furthermore, the number between the stabilization layer is also 14 and the decorative layer 16 in another preferred embodiment, three layers of technical paper, each having a thickness of 0.2 mm.

As a general rule It should be noted that the strengths indicated in the preferred embodiments of the individual layers of the multi-layer veneer system are variable. Dependent on of the trim part and its shaping by the multi-layer veneering system can cover both the number and the strength of the Support layers, the presence and the strength a stabilizing layer, the thickness of the decorative layer as well the presence and the strength the surface lacquer layer selected become. If tight radii are required, the layer thicknesses become and the number of layers of the engineering paper accordingly designed. The embodiments shown here are suitable especially for a Decorative part located in the interior of a motor vehicle.

Claims (13)

Multi-layer veneering system for decorative parts, with a carrier layer ( 10 ), which is at least partially provided with a veneer, thereon at least two mutually separate support layers ( 12.1 ... 12.4 ), which strengthen the veneer system, and thereon a decorative layer ( 16 ), which determines the surface appearance of the veneer system, characterized in that at least one of the support layers ( 12.1 ... 12.4 ) comprises technical paper material. Multilayer veneer system according to claim 1, characterized in that several, in particular all supporting layers ( 12.1 ... 12.4 ) are formed in particular from the same technical paper material. Multilayer veneer system according to claim 1 or 2, characterized in that the technical paper material is impregnated with a resin material, in particular with urea, melamine or phenolic resin, which adhesively bonding the paper material together, preferably also with the carrier layer (US Pat. 10 ) and / or the decorative layer ( 16 ) allowed. Multilayer veneer system according to one of claims 1 to 3, characterized in that between the at least two support layers ( 12.1 ... 12.4 ) optionally a stabilization layer ( 14 ), preferably of plastic or metal, particularly preferably of aluminum, and in particular with a thickness of between 0.1 mm and 0.8 mm, can be introduced. Multilayer veneer system according to one of claims 1 to 4, characterized in that on the decorative layer ( 16 ) a topcoat ( 18 ), preferably a polyester lacquer or polyurethane lacquer, and preferably with a thickness of between 0.5 mm and 1.5 mm, can be applied. Multilayer veneer system according to one of claims 1 to 5, characterized in that the carrier layer ( 10 ) Plastic material and / or metal. Multilayer veneer system according to one of claims 1 to 6, characterized in that the carrier layer ( 10 ) by injection of the through the support layers ( 12.1 ... 12.4 ) strengthened decorative layer ( 16 ) is formed in the multi-layer veneer system. Multilayer veneer system according to one of claims 1 to 7, characterized in that the carrier layer ( 10 ) a thickness between 1.5 mm and 4.5 mm and / or each of the support layers ( 12.1 ... 12.4 ) a thickness of between 0.1 mm and 1 mm and / or the decorative layer ( 16 ) has a thickness of between 0.1 mm and 1.0 mm. Trim part comprising a multi-layer veneer system according to one of the claims 1 to 8. Method for producing a multilayer veneer system according to one of Claims 1 to 8, characterized in that the support layers ( 12.1 ... 12.4 ) are joined together by pressing and stiffened. Method according to claim 11, characterized in that the support layers ( 12.1 ... 12.4 ) by pressing additionally with the decorative layer ( 16 ) get connected. Method according to claim 11 or 12, characterized in that the carrier layer ( 10 ) by injecting the compressed support layers ( 12.1 ... 12.4 ) is introduced into the multi-layer veneer system. Method according to claim 11 or 12, characterized in that the support layers ( 12.1 ... 12.4 ) additionally by pressing with the carrier layer ( 10 ) get connected.