DE202005011383U1 - Three-dimensional bendable and ductile composite material used in making housing sections of e.g. computers, has planar elements with wide surfaces and shear deformation property, and formed with liquid-tight, pressure-resistant coating - Google Patents

Abstract

The composite material comprises of planar elements having wide or big surfaces and shear deformation property, and formed with liquid-tight and pressure-resistant coating. An adhesive is used for stably connecting the planar elements together. The planar element can be made of wood and flexible plastics. The planar elements are formed and connected together without bulging, breaking or folding.

Description

The The invention relates to a three-dimensionally bendable surface element made of wood or wood composite material for the production of shell-shaped semi-finished products or finished parts, in particular housing parts of personal computers, Telephones, of vehicle interior trim, such as dashboards or Center consoles or bowls of seating, in particular chairs.

In DE 101 24 913 C1 a method for producing a three-dimensionally bendable surface element made of wood or wood composite material is described, which is insensitive to the risk of breakage or the tendency to crack during its further processing. By applying a shear-deformable material such as threads, fabric, non-woven, foil o of an adhesive layer, a cross-bond between the individual strips of the surface element is produced.

adversely with this surface element is its permeability across from Gases and liquids, such as As air, liquid Adhesives or plastic melts. Even when using transparencies that only the stabilization of the cross-composite of the surface element Serve exists during the shear deformation the risk of cracking, so at least locally gas and liquid permeable areas arise.

The Tightness of the surface element across from Gases are an elementary prerequisite for vacuum drawing or compressed air without complex Auxiliary devices, such as press membranes.

The Penetration of adhesives or other liquid substances is undesirable because it disturbs the closure of the surface of the surface element or the pressure conditions while makes the processing uncontrollable.

The object of the invention is to provide a three-dimensionally bendable surface element made of wood or wood composite material according to DE 101 24 913 C1 , which during its further processing to divide into three-dimensional shape or in the coating of three-dimensional moldings resistant to the gas and / or liquid pressures occurring during forming, without losing its closed, planar structure and the penetration of gas and / or liquid in prevents the joints between the individual strips of the surface element.

According to the invention Task fulfilled by a three-dimensionally bendable composite material, consisting from a three-dimensionally bendable surface element, which on at least a broad or large area of a gas and liquid density Layer has. The gas and liquid-tight layer is preferably by an adhesive used to produce the bendable composite material is used with the sheet-like composite material Completely or partially connected.

The gas and liquid density Layer allows together with the also shear deformable Adhesive the forming of the composite material and guaranteed while the forming process stability the cross-association of the individual strips and at the same time the required Gas and liquid tightness when pressed up to 500 (1000) bar even after completed shear deformation of the composite material.

In dependence From the degree of deformation in the three-dimensional bending deformation, the mechanical load capacity of the cross-connection of the individual strips the composite advantageously by at least one optional Stabilization layer of threads, Fabrics, fleece, another film or another adhesive elevated become.

The on at least one major or wide area of the three-dimensionally bendable surface element arranged, gas and liquid density Layer is preferably made of a heat plastifiable, shear-deformable film formed, which advantageously using one in the same or similar Temperature plastifiable adhesive with the surface element entire area or partially bonded.

alternative becomes the gas and liquid density, plastifiable layer without additional adhesive informal as a melt, dispersion or curable casting on the wholesale or wide area applied to the three-dimensional bendable surface element. The plasticization required for shear deformation is carried out by full or local heating or by the action of a solvent, which diffuses into the adjacent material after processing.

Prefers shows the gas and liquid density, relapsing Ductile Coat even at room temperature sufficient flow behavior.

Advantageous are called gas and liquid density Layer adhesives of acrylate used.

The composite can be used as a wood veneer coating on a three-dimensionally shaped, solid body, such as a molded wood fiber molding, a laminated glass fiber molding, a deep drawn, injection-molded or glass-fiber reinforced plastic part or a light metal injection-molded part are pressed using a liquid adhesive. When the composite material is pressed in, the adhesive joint creates a fluid pressure that is reliably absorbed by the gas- and liquid-tight layer. As a result, the penetration of the liquid adhesive through the joints between the stubby abutting strips of the composite is prevented until the liquid or viscous adhesive is cured properly. The curing can be done depending on the type of adhesive by Wegdiffundieren of water (dispersion), a chemical reaction or by solidification of an adhesive melt.

The three-dimensional bending deformation of the composite takes place either during of pressing or - specifically with larger degree of deformation - separately before pressing in a special, by means of vacuum and / or Compressed air operated deep drawing device. The gas- and liquid-tight layer takes care of the maintenance of the required pressure conditions. Alternatively, the three-dimensional bending deformation of the composite also be done by mechanical pressure elements.

As when coating can also layered shaped parts (eg of several layered three-dimensional bendable surface elements consisting), in which preferably the outer layers from inventive composite material consist.

Of the Composite material according to the invention Alternatively, as a cover layer made from the liquid phase out Moldings, such as foamed or injection-molded plastic parts, are used. there a possibly preformed composite part is inserted into the foam mold and z. B. foamed back by means of polyurethane. The under pressure inflowing foam mixture pressed from the inside of the composite part, without by the gas and liquid density Layer penetrates, combines with the composite material and forms such a foamed, with wood veneer surface-treated body, such as z. B. a chair molding.

In Similarly, a plastic injection molding compound behind the composite part be sprayed, the compound preferably by melting the gas and liquid densities Layer takes place.

The Invention will be explained in more detail with reference to two embodiments.

Embodiment 1

coating a three-dimensionally shaped housing part made of plastic.

One Three-dimensionally bendable composite material consists of a three-dimensionally bendable surface element of thickness 1.2 mm, which is built from a 0.4 mm thick layer of oak veneer as a decorative cover layer and a 0.8 mm thick beech veneer layer. Below that is a 0.4 mm using a PVAc adhesive thickness, gas and liquid density Glued polyolefin film.

Of the Composite material is used to coat a three-dimensionally shaped Fiberglass plastic part. To prepare the coating will be a composite blank whose format is to be coated Part corresponds, between a pair of heating plates to a temperature of 110 ° C heated and subsequently in a vacuum thermoforming device in the shape of the to be coated Partially brought. The meantime cooled composite part is using an acrylate adhesive and a Formpreßvorrrichtung, the working with a pressure of 5 bar, on the fiberglass plastic part glued.

Either while The vacuum forming as well as the pressing remains the innovative Composite air- and liquid-tight, so that a safe procedure and a flawless surface quality of the wood veneer coated workpiece guaranteed is.

Embodiment 2

back injection a limp composite preform with plastic.

One Three-dimensional bendable surface element made of beech with a Thickness of 1.2 mm is back coated with a 0.3 mm thick film of high pressure polyethylene. The coating was carried out by pressing or melting at a temperature from 180 ° C with the help of a separating plate, which after completion of the Pressing process is recooled to a temperature of 55 ° C. Below is the composite removed from the separating plate.

Of the The resulting composite material is analogous to Example 1 by deep drawing preformed. This air and liquid density Composite preform is then placed in a corresponding plastic injection mold inserted and back-injected with an ABS injection molding compound, wherein the composite material firmly bonds to the injection molding compound.

The Process and product advantages correspond to those of the exemplary embodiment 1.

Claims (6)

Three-dimensionally bendable surface element made of wood or wood composite material for producing shell-shaped semi-finished or finished parts, comprising at least one three-dimensional bendable, shell-shaped body (3D body) or a three-dimensionally shaped component with three-dimensionally bendable surface elements (3D surface elements) or with conventional bend-deformable surface elements ( 2D surface elements), wherein the reshaped 2D or 3D surface elements tailored to the processing measure and positioned for the forming process or fixed in position relative to each other and the single or multi-layered surface elements are partially or fully formed, the change in shape by a shear deformation effected in the surface of all surface elements involved and a simultaneous multi-axial bending deformation of the surface elements in the region of the active forming zone and by generating a in Umf ormzone acting counter-tension bulging, buckling or folding of the surface element is suppressed in the forming zone, the counter tension allows deformation of the reshaped surface element by the procedural necessary shift within the single or multi-layered 2D or 3D surface elements and at the same time a stability failure prevents the reshaped 2D or 3D surface elements during the forming process, and that after reaching the desired degree of deformation, the elastically or elastically plastically deformed surface elements are pressurized until the surface elements under the action of an adhesive with each other or the strips within a surface element with each other or with them supporting element are connected, characterized in that on at least one wide or large surface of the three-dimensionally bendable surface element a schubverformungsfähige, gas and liquid-tight, pressure-resistant e layer is arranged. Three-dimensionally bendable surface element according to claim 1, characterized in that the gas and liquid density Layer one by heat plasticizable film is that by means of one in the same or similar Temperature plastifiable adhesive with the surface element entire area or partially connected. Three-dimensionally bendable surface element according to claim 1, characterized in that the gas and liquid density Layer as a melt, dispersion or curable casting material on at least one Big- or wide area of the three-dimensionally bendable surface element is arranged. Three-dimensionally bendable surface element according to one of the claims 1 to 3, characterized in that the surface element at least one, at or below the gas and liquid densities Layer arranged stabilization layer of threads, fabrics, nonwoven, a further film or another adhesive. Three-dimensionally bendable surface element according to one of the claims 1 to 4, characterized in that the deformed surface element as a coating element with positive, force and / or material fit with a three-dimensionally shaped, solid body, such as a milled wooden or wood fiber molding, a laminated glass fiber molding, a deep drawn, injection molded or glass fiber reinforced plastic part or a light metal Spitzgießteil is connected. Three-dimensionally bendable surface element according to one of the claims 1 to 4, characterized in that the deformed surface element as a cover layer with a, from the liquid phase by injection molding manufactured molding insoluble connected is.