DE19755952C1 - Thin-walled moulded part for electrical and electronic devices - Google Patents

Abstract

The invention relates to a thin-walled, electromagnetic shielding, deep-drawn shaped part having a layer comprised of a film material which can be cold-stretched. A mesh, net or woven material is laminated on said shaped part with the assistance of a heat-seal bonding agent containing a small-sized electrically conductive pigment. Said mesh, net or woven material has a mesh width smaller than 1 mm and is made of a metal wire having a wire strength less than 100 mu m, said metal wire being comprised of a soft material which can be drawn. By virtue of the low electric contact resistance and high shielding attenuation of said material, such shaped parts can, for example, be used as a shielding housing in the area of mobile radio telephones. For production, an initially flat composite material comprised of a film which can be cold stretched, a heat-seal bonding agent layer and a metal structure can be immediately and directly pressurized with a hydraulic fluid, preferably compressed air, at a working temperature lower than the softening temperature of the film material, and can be formed on the mold hollow cavity of a negative mold or positive mold in an impact-like manner with a hydraulic fluid pressure greater than 20 bar.

Description

The present invention relates to a thin-walled, electro magnetically shielded, deep-drawn molded part and a Process for its production. Furthermore, he concerns Find an intermediate product used in this process is cash. Because of their electromagnetic shielding the moldings according to the invention in particular for housing used by electrical and / or electronic devices that generate electromagnetic interference. The molded parts according to the invention can preferably be used as an umbrella Housing or screen housing parts of mobile phones, computers, Laptops, shavers and the like, and for covering of printed circuit boards.

Process for high pressure deformation with the measures from the The preamble of claim 10 are from the German Offen document 38 44 584 known. In this publication the incorporation of metal-containing structures into the there  described thin-walled, deep-drawn plastic mold parts not addressed.

Furthermore, the German Offenlegungsschrift discloses 36 01 153 a deep-drawn molded part and a method for the same Manufacturing. This is done at least on a first layer a second layer made of a thermoformable material applied a non-thermoformable material, and after following both layers together by means of low pull deformed. The non-thermoformable material can the braids, fabrics or fleeces are made of metal. If this second layer of certain metals be stands, the shielding properties of metals against be exploited via electromagnetic radiation where thanks to plastic molded parts with a favorable shielding effect can be generated. The second one can be done before the deep-drawing process Layer temporarily adheres to the first layer be determined, for example with the help of an adhesive fabric. This contains the type and selection of this adhesive Documentation no information.

Typically, it is an adhesive other material with thermoplastic materials ver should bind to electrically non-conductive organic Materials. The adhesive creates a good adhesive, elec non-conductive insulating layer on the metal structure door. The presence of this insulating layer prepares Schwie when the Me. acting as a Faradey cage tall structure of the molded part later with electrically conductive Device components should be connected. That in DE-OS 36 01 153 deep-drawing process described is not ver comparable to the high pressure deep drawing process of DE-OS 38 44 584.

The object of the present invention is a easy to manufacture, thin-walled, deep-drawn plastic To provide molded parts with an integrated Ab shield against electromagnetic radiation and the electrical contact resistance is smaller Have 200 milliohms. Preferably this shape parts can be used as a screen housing in the mobile radio sector.

Furthermore, this should go back to the same applicant Process of DE-OS 38 44 584 modified and improved be so that thin-walled, electro magnetically shielded deep-drawn molded parts of the above mentioned type are available.

An embodiment of the solution according to the invention on this task is a thin-walled, electrically shielding, deep-drawn mold part, with a layer of a cold-stretchable film material, to which with the help of, a fine-particle, electrically conductive pigment containing heat seal adhesive,
a lattice, net or fabric is laminated on, which has a mesh width of less than 1 mm and which is formed from a metal wire with a wire thickness of less than 100 μm from a soft, drawable metal.

Advantageous refinements and developments result itself from the subclaims to this molded part.

Another embodiment of the solution according to the invention The above object relates to a method for producing a thin-walled, with an integrated electro-magnetic Shielded, deep-drawn molded part.  

Based on a process being a flat multilayer composite material, the at least one layer of cold-stretchable film has material, at a working temperature below the softening temperature ratur this film material directly and directly with a Pressurized fluid and larger at a pressure fluid pressure 20 bar abruptly to the mold cavity of a negative mold or Positive form is molded, is the solution of the above object characterized in that to the flat, cold-stretchable film material with the help of hot sealing adhesive, which is a finely divided, electrically conductive pig contains a grid, mesh or fabric, which has a mesh size of less than 1 mm and which consists of a a wire gauge of less than 100 µm metal wire a soft, drawable metal is formed; and the composite material thus obtained is deformed.

Advantageous refinements and developments result arising from the subclaims to this method.

The composite used in the above process material can be produced by cold on the stretchable film material of certain, an electrically lei flowable pigment containing flowable heat seal adhesive is brought on this adhesive layer the certain me tall structure applied and the layer material thus obtained is laminated under the influence of heat and pressure. Dude natively, a previously created and independently manageable A preliminary or intermediate product can be provided that the Me tall structure and the specific heat seal adhesive.  

In this case, an intermediate product is provided for use in the aforementioned method, which comprises:

• - a protective film made from a dry heat seal glue easily removable plastic;
• - a dry one applied to this protective film thermoplastic heat seal adhesive layer, the one contains electrically conductive pigment and which in a Temperature greater than or equal to 80 ° C can be heat activated,
• - one on the heat seal adhesive layer at least partially embedded grid, mesh or tissue, that has a mesh size smaller than 1 mm and that a wire with a wire thickness of less than 100 µm tall wire made of a soft, pullable metal is.

Advantageous refinements and developments result from the subclaims for this intermediate.

The molded parts according to the invention are obtained by simultaneous, joint deformation of a composite material. This - initially flat - composite material has at least three components, namely

• - One serving as a base or support for the molded part Layer of cold-stretchable film material;
• - a certain metal structure, which - in the sense of a Faraday cage - the required shield against delivers about electromagnetic radiation; and
• - a selected adhesive that matches the metal structure with the Foil material connects and because of its elec trical conductivity the shielding attenuation of the molded part elevated.

The cold-deformable film materials are preferably Polycarbonates (for example those sold by BAYER AG MACROLON grades), ABS polymers (butadiene / acrylonitrile / Styrene polymers), polyester, especially aromatic Polyesters (for example polyalkylene terephthalates), polyamides (for example PA 6 or PA 66 grades, also high-strength Aramide films), polyimides (for example those under the Trade name "CAPTON" distributed foils) and further the copolymers known under the name FEB Tetrafluoroethylene and hexafluoropropylene. Further can in individual cases also organic thermoplastic cells loose esters, especially their acetates, propionates and azeto butyrates are used. Some of the above mentioned film materials also in varieties or types of trade commonly accessible, which has increased electrical conductivity exhibit. For example, here are those sold by BAYER AG called ASA film types, films based on polycarbonate with increased electrical conductivity. Where available are preferably the above-mentioned film types used with increased electrical conductivity. Especially foil materials made of polycarbonates ("MACRO LON "," ASA "), polyalkylene terephthalates, ABS polymers and polyimides ("CAPTON") are used.

These film materials can preferably have layer thicknesses have between 50 and 500 microns. Particularly good results for example with polycarbonate films ("MACROLON" or "MACRO-FOL" or "ASA" from BAYER AG) or with ABS foils, each obtained with a layer thickness between 100 and 200 microns. A layer thickness of 500 µm provides a deep-drawn one nes, self-supporting molded part.

An important area of application for molded parts according to the invention are Shield housing in the mobile radio area. In the housing of a mobile Telephones (cell phones) can occur in different compartments  work at different operating frequencies. Every compartment must be carefully shielded from the adjacent compartment in order to avoid mutual interference. For example, after ASTM D 4935-89 determinable shielding attenuation should be at least 30 dB be. Such a shield is typically covered by Enclosure created within a metallic shell that acts as a Faraday cage. The use of full area Metal foils is due to the limited thermoforming ability and the sufficient adhesion to the carrier film is problematic. On the other hand, the metallic shell must be largely ge be closed. Already by a few millimeters wide Lö gaps or gaps would be in electromagnetic interference to pass through or exit to an intolerable extent. In the context of the present invention, it was recognized that both the required electromagnetic shielding like achieve the required deep drawing ability if a mesh, mesh or fabric is used as the metal structure that has a mesh size smaller than 1 mm, and that from a metal with a wire thickness of less than 100 µm wire is formed from a soft, pullable metal. As such metals come for example aluminum, copper, Nic kel, tin and their alloys including brass in Consideration. Metal mesh made of copper, aluminum is preferred minium or brass. For example, come Stan dard fabric with a smooth weave. The stitches width can preferably be 200 to 800 microns. Preferential Metal mesh made of very thin metal wires becomes wise used, for example with wire sizes from 20 to 60 microns, because such metal mesh fiction slightly deform according to the intended deep-drawing conditions leave and after the deformation no restoring force sen. Particularly good results are made with a fabric Copper wire achieved a wire thickness of about 50 microns has, the fabric having a mesh size of about 460 microns having. Annealed copper grids are particularly preferred  of this kind because the previous glow is the bending stone copper wire even further. Such Metal meshes are commercially available, for example of wire weaving mills that produce screen printing fabrics.

As an adhesive for permanent and thermoformable bonding this metal structure with the cold-stretchable carrier film a heat seal adhesive is used according to the invention. As a heat seal adhesives are organic adhesives that are found in troc kenem state thermoplastic properties and which melt through the action of heat and thus heat acti are feasible. Typical temperatures for heat activation are about 120 to 140 ° C; special heat seal adhesive sor ten are already at temperatures greater than or equal to 80 ° C heat-activated, provided there is also a longer pressing duration is applied. These are preferably Heat seal adhesives to make water-dispersible adhesives the basis of aliphatic polyurethane (e). Depending on the water content it is highly viscous masses with a honey remembering flow behavior.

If the processing of the adhesive to produce the Ver bundle material and the high pressure deformation of the composite material practically in one operation within a few hours preferably within a processing time of no more than 5 to 6 hours can be done in the glue too a hardener can be incorporated. As a hardener comes for example an aliphatic polyisocyanate, such as one of the DESMODUR varieties (trademark of BAYER AG). In this case, a hardener additive of 0.5 to 2.5% by weight sufficient and appropriate.

If, on the other hand, an independently manageable and warehouse capable intermediate product made of protective film, heat seal adhesive  and metal structure is provided, such a hardener no additive. The system of glue and hardener ver wets gradually even at room temperature, the thermo plastic properties are lost. For one The intermediate product should therefore preferably be a heat seal adhesive can be provided without hardener.

According to an essential aspect of the invention, a such heat seal adhesive used, the sufficient amount contains electrically conductive pigment so that the finished inventions deep-drawn part according to the invention has an electrical contact resistance less than 200 milliOhm. Conduct to suitable electrical the pigments include metal powder, such as powder Aluminum, copper, nickel, tin, brass or bronze, or Carbon in the form of soot or graphite, or elec trically conductive metal oxides such as magnetite. Preferred elec Trically conductive pigments are carbon black or graphite, which are found in aqueous adhesive dispersions of the type considered here are good spread out. Furthermore, there is a tendency to phase separation and settling or floating. Preferably, the water-sealable heat seal adhesives as electrically conductive pigment in any case contain carbon black or graphite and can additionally one of the metal powder or powder mentioned shaped metal oxides included. Additional metal Powder can also be used with an anti-settling agent be treated on a surfactant basis.

The distributability and the excretion behavior of the Pig elements in / out of the aqueous adhesive dispersion is also caused by affects the particle size of the pigments. In the case of soot as a conductive pigment are preferred types with a medium primary particle size of less than or equal to 50 nm. Additional metal powder can have a grain size less than 5 µm, preferably a grain size less than 2 µm  point. Such pigments can easily be stirred Spread evenly in the aqueous adhesive dispersion.

Such an amount becomes electrically conductive in the adhesive Pigment distributed, so that one finally conduct electrically de adhesive layer is obtained, which in the dry state electrical contact resistance less than 200 milliOhm. Typically, about 10 to 40 wt .-%, based on the Solid weight of adhesive and pigment, incorporated into the adhesive is working. For example, good results are obtained if about 20% by weight of carbon black or graphite is incorporated into the adhesive be prepared. The electrical conductivity of a so generated th adhesive layer increases the shielding attenuation according to the invention Deep-drawn parts.

As starting materials for such electrically conductive hot sealing glue can be, for example, from Farbenfabrik Pröll GmbH & Co., 91781 Weißenburg, Germany under the Warenzei Chen AQUAPRESS distributed adhesive systems (essentially aqueous dispersions of aliphatic polyurethanes), which are not yet mixed with electrically conductive pigment. Conduct electrically to produce usable according to the invention The heat seal adhesive can be used in these well-known AQUAPRESS adhesives electrically conductive pigment, especially carbon black and given if a finely divided metal powder is also incorporated will.

To produce the thin-walled, with an integrated elek tromagnetic shielded, deep-drawn shape partly a preliminary or intermediate product can be provided, that of a protective film, the metal structure and the ge dried, but still heat activated heat seal adhesive- Layer. The protective film is intended to manufacture and Facilitate handling and serves in particular when  Passage of the composite material through heated rolling couple to adhere adhesive to one of these rollers prevent. The protective film should be different from the dried one Let the adhesive peel off easily. Preferably one is wide inert protective film made of polyethylene, polypropylene, Polyester or polyfluorocarbon is provided. Typi The layer of the protective film is usually smaller 50 µm completely sufficient; for example, protection film from the polymers mentioned with one layer thickness of 20 to 40 µm can be used.

On the flat protective film, the one with electrically conductive Apply pigment-filled heat seal adhesive over the entire surface. The application of the adhesive layer can for example in Screen printing process. Experiments have shown that the ultimately achievable adhesive strength also from the Layer thickness depends on the adhesive layer. Within certain Limits, a higher layer thickness increases the achievable Adhesive strength. The layer thickness of the adhesive layer should be approximately 5 to 50 microns; is preferably a layer thickness of provided about 15 to 30 microns. To achieve such a layer thick screen printing is advisable. Alternatively, other ways of working for the order of the flowable, highly viscous glue are provided, such as about spreading with the help of a squeegee, or a kaschie tion with the help of rollers. On the adhesive layer Metal structure placed in the liquid or plastic Adhesive mass pressed in and fixed in places. Subsequently this composite is dried, for example with hot air in a continuous furnace.

An alternative way of working is on protection foil the liquid, with electrically conductive pigment ver see glue applied all over. This association will  dried, for example with hot air in a continuous oven. Then the. On the dried adhesive layer Metal structure applied. One is on the metal structure additional protective film applied. This association is through a heated pair of rollers guided and connected together or laminated. Before further processing, one of the peeled off both protective films.

The intermediate product thus obtained is further processed processing stored. The preferably not mixed with hardener te and therefore not cross-linked adhesive remains thermoplastic and heat activated and can be used in a later step by exposure to heat with that provided according to the invention cold-stretchable film material are connected. So far is this preliminary or intermediate product a independently manageable and storable product on the Way of producing a molded part according to the invention.

For further processing, that intended for the molded part is used provided flat cold-stretchable film material, at for example an ABS film or a polycarbonate film especially an electrically conductive ASA film with a Layer thickness of approximately 200 µm. On this slide it will Intermediate product placed so that the protective film ent distant to the cold-stretchable film. The so obtained Composite material is heated to activate the adhesive. This is done by heating to a temperature above the activation temperature of the heat seal adhesive and below half the softening temperature of the cold stretchable film materials. Typically, heating takes place on a Temperature in the range of 80 to 140 ° C. Preferably a warming to rather low temperatures in the area from about 80 to 100 ° C provided, at the same time a prolonged pressure exposure of 50 seconds or / longer.  

The combined action of heat and pressure leads to an intimate and lasting connection of the metal structure with the cold stretchable film. In this way the ver bundle material are produced in the form of endless webs which are later punched out certain outlines, which the high pressure deformation to produce the invention Moldings are fed.

An alternative way of working can be on an end loose sheet of cold-stretchable film, in sections, wherever deep-drawing is to be done, this is already partially correct cut intermediate product to be placed. This off with metal structure and adhesive layer Cold-stretchable film is seen through a pressing apparatus led to the under heat and pressure Metal structure permanently with the cold-stretchable film connect. Thereupon, this endless web material fed in sections to the deep-drawing process.

Another alternative can be cold stretchable film material and the intermediate product each in the desired outline provided after the Lamination in the still warm state of immediately closing high pressure deformation can be supplied. In this The composite material is reheated the working temperature of the high pressure deformation step avoided.

On the other hand, the application of a pre-made that Metal structure and the intermediate product containing the adhesive not mandatory.

Alternatively, molded parts according to the invention can be produced in a plurality of immediately successive work steps. First, heat seal adhesive is applied or provided, which is provided with the electrically conductive pigment. This adhesive is applied evenly to individual die-cut pieces of the cold-stretchable film, which are provided with alignment marks. The metal structure punched out in the same outline is placed on the adhesive layer. This layer structure is laminated in a compression apparatus under the action of heat and pressure. For the rather low temperatures between approximately 80 and 100 ° C., a pressing time between approximately 100 and 300 seconds under a pressure of approximately 100 to 300 N / cm ^{2 can be} provided. The laminated composite material, which is still warm, is then immediately subjected to high-pressure deformation.

Basically, the deformation of the flat multilayer gene composite material to the molded part according to the invention known deep-drawing processes take place. It is preferred but isostatic high pressure deformation is provided at a pressure fluid greater than 20 bar directly and directly the flat multilayer composite material acts and this abruptly to the mold cavity of a negative mold or posi molded shape. Such an isostatic high pressure ver The detailed procedure is in the German Offenle 38 38 584 and the associated patent specification 38 40 542. A device for performing this isostatic high pressure deformation process is in individual be in German Patent 41 13 568 wrote. With the express reference to this Publications should have their content - so far for understanding and helpful in practicing the present invention and necessary - also part of the present Un documents are made.  

The ones obtained after this isostatic high pressure deformation Moldings are thin-walled; their wall thickness is mostly just a few 100 microns. Typically showed the shape essentially divide one into all surface sections uniform layer thickness less than 1.2 mm. If necessary, you can injection molded this molded body with additional synthetic resin will.

The following example serves to further explain the Invention without restricting it.

Example:

The following are provided as starting materials:

• - Polycarbonate film (ASA from BAYER AG) with a Layer thickness of 200 microns in the form of an endless, too a roll of rolled up web.
• - Metal structure, namely a metal mesh made of copper wire with smooth binding and with a mesh size of 458 µm; the copper wire has a wire gauge from 50 µm. Such a copper wire mesh can for example from Spoerl GmbH, D-72517 Sigmarin gendorf can be obtained.
• - Heat seal adhesive, in the form of an aqueous dispersion various aliphatic polyurethanes that already by the manufacturer with about 20 wt .-% carbon black and has been assembled ready for use. (Such a Experimentally, Kleber was used by the Pröll paint factory GmbH & Co., D-91781 Weissenburg and provided is based on the AQUAPRESS HT variety sold there (registered trademark of the Pröll paint factory GmbH & Co.)).

The sheet-like polycarbenate film becomes individual Pieces with the dimensions 8 × 8 cm punched out. Each Foil piece is ver with markings for positioning see. Each piece of film is screen printed an approx. 30 µm thick layer of soot filled with soot ger adhesive dispersion applied; a three follows multiple screen printing order.

A cut piece is placed on the wet adhesive layer Copper wire mesh with the same dimensions applied.

The layer material produced in this way is transferred by hand to a compression apparatus and is pressed and laminated there at a temperature of about 100 ° C. and under a pressure of about 180 N / cm ^{2 for} 60 seconds.

The still warm composite material is spread onto the porridge by hand th frame of a negative mold placed, the mold cavity a square board housing with a side length of about 40 mm and a depth of about 8 mm. Here the copper wire mesh lies on the form edge. The press is closed until the edge of the counterpart is close to the Top of the film is applied. The shape is under one Hydraulic medium pressure of about 100 t closed. By the The counterpart is injected with heated compressed air, the one Has temperature of about 120 ° C. The compressed air supply is controlled by an inlet valve that opened for about 1 sec remains net. Then the inlet valve is closed and an outlet valve opened to relieve the pressure of the ge entire mold interior. Then the shape opened and the deep-drawn sheet removed.

The copper wire mesh has this sudden high pressure ver formation without cracking and / or other recognizable essentials  changes in the fabric texture. The layer The thickness of the board housing is uniform in every cross-section Lich. The edge of the board housing is made to a width of cut about 10 mm. Then the plati BEFE housing in the usual way on a circuit board increases. The electrical contact resistance is according to übli Chen process measured and is about 160 milliOhm. At the Board housing is using the so-called four-point measuring method de the square surface resistance measured. Because of A shielding attenuation of about 72 dB is expected of the measured value tet. Such shield housings are for use in the mobile radio range suitable.

Claims (38)

1. Thin-walled, electro-magnetic shielding, deep drawn molding, with a layer of a cold stretchable film mat rial, to which with the help of, a finely divided electrical conductive pigment-containing heat seal adhesive Lattice, mesh or fabric is laminated, which is a Ma has a width of less than 1 mm and that from a a wire thickness of less than 100 µm metal wire is formed from a soft, pullable metal. 2. Molding according to claim 1, characterized in that the cold-stretchable film material is a polycarbonate film or an ABS film, each with a layer thickness of 50 is up to 500 µm.   3. Molding according to claim 1 or 2, characterized in that the heat seal adhesive is a water-dispersible adhesive is based on aliphatic polyurethanes (e), which at a temperature greater than or equal to 80 ° C can be heat activated. 4. Molding according to one of claims 1 to 3, characterized in that the heat seal adhesive 10 to 40 wt .-% (based on the Solid weight of adhesive and pigment) contains electrically conductive pigment. 5. Molding according to one of claims 1 to 4, characterized in that the electrically conductive pigment is a metal powder, such as Aluminum, copper, nickel, tin, brass or Bronze powder or carbon black, graphite or magnetite. 6. molded part according to one of claims 1 to 5, characterized in that the electrically conductive pigment is carbon black or graphite. 7. Molding according to one of claims 1 to 4, characterized in that the heat seal adhesive as an electrically conductive pigment Carbon black or graphite and a metal powder that contains Aluminum, copper, nickel, tin, brass or Bronze powder is selected. 8. Molding according to one of claims 1 to 7, characterized in that the metal grid, mesh or mesh is a mesh has a width of 200 to 800 µm.   9. Molding according to one of claims 1 to 7, characterized in that the metal grid, mesh or mesh made of a metal wire consists of a wire thickness of 20 to 60 microns having. 10. Process for producing a thin-walled, deep-drawn molded part provided with an electromagnetic shield,
a flat multilayer composite material having at least one layer of a cold-stretchable film material,
at a working temperature below the softening temperature of this film material, a pressure fluid is directly and directly applied and, at a pressure fluid pressure greater than 20 bar, it is suddenly molded onto the mold cavity of a negative mold or positive mold,
characterized in that
to the flat, cold-stretchable film material with the help of heat seal adhesive, which contains a finely divided, electrically conductive pigment, a lattice, mesh or fabric is laminated, which has a mesh size of less than 1 mm and which has a wire thickness of less than 100 µm Metal wire is formed from a white, drawable metal; and
the composite material thus obtained is deformed. 11. The method according to claim 10, characterized in that the deformation of the composite material at work temperature between 80 and 140 ° C is carried out.   12. The method according to any one of claims 10 to 11, characterized in that the forming of the composite material within one Time period less than 2 seconds is carried out. 13. The method according to any one of claims 10 to 12, characterized in that a cold stretchable film material with one layer thickness between 50 and 500 microns is formed. 14. The method according to any one of claims 10 to 13, characterized in that a cold-stretchable film material made of thermoplastic plastics based on polycarbonates, ABS polymers, polyamides, polyimides, polyesters, organic cellulose esters or polyfluorocarbons materials are formed. 15. The method according to any one of claims 10 to 14, characterized in that as a heat seal adhesive a water dispersible Adhesive based on aliphatic polyurethane (s) used heat at a temperature greater than or equal to 80 ° C can be activated. 16. The method according to any one of claims 10 to 15, characterized in that a heat seal adhesive is used, which up to one Amount of 10 to 40 wt .-% (based on the solid weight of adhesive and pigment) with a fine, electrically conductive pigment is filled. 17. The method according to any one of claims 10 to 16, characterized in that a metal powder as an electrically conductive pigment  such as aluminum, copper, nickel, tin, brass or bronze powder or carbon black, graphite or magnetite is used. 18. The method according to any one of claims 10 to 17, characterized in that carbon black or graphite as an electrically conductive pigment is set. 19. The method according to any one of claims 10 to 18, characterized in that a lattice, mesh, or tissue made of a soft, pull baren metal, namely of aluminum, copper, nickel, Tin or their alloys such as brass is used. 20. The method according to any one of claims 10 to 19, characterized in that a metal grid, mesh or mesh with one Mesh size of 200 to 800 microns is used. 21. The method according to any one of claims 10 to 20, characterized in that
on the flat, cold-stretchable film material, the flowable heat-sealing adhesive provided with fine-particle, electrically conductive pigment is applied over the entire surface,
the metal structure is placed on the adhesive layer; and
the layer material thus obtained is laminated under the action of heat and pressure. 22. The method according to any one of claims 10 to 21, characterized in that
to produce an intermediate product on a protective film which can be easily removed from the heat seal adhesive and which is applied over its entire area to flowable heat seal adhesive provided with finely divided, electrically conductive pigment; and
the metal structure is placed on this adhesive layer and at least partially pressed into the adhesive layer; and
the layer material thus obtained is dried under the action of heat. 23. The method according to claim 22, characterized in that a protective film made of polyethylene, polypropylene, poly ester or polyfluorocarbons used becomes. 24. The method according to claim 23, characterized in that
the intermediate product thus obtained is assembled and placed on a cold-stretchable film material; and
the double layer thus obtained is laminated under the action of heat and pressure to produce a composite material which is subjected to the high-pressure deformation. 25. The method according to claim 24, characterized in that for lamination to a temperature of 80 to 140 ° C is heated. 26. The method according to claim 24 or 25, characterized in that for lamination, a pressure action takes place under a pressure of 100 to 300 N / cm ² . 27. The method according to any one of claims 24 to 26, characterized in that for lamination a pressure over a period of time from 10 to 300 seconds. 28. The method according to any one of claims 10 to 27, characterized in that
the composite material is arranged between a negative form or a positive form and a counterpart in a defined position in order to carry out the high pressure deformation,
Form and counterpart are closed pressure-tight; and a pressure fluid is fed through one or more channels recessed in the counterpart, which acts directly and directly on the composite material to be deformed and forms this composite material isostatically on a structure or recess formed in the mold, the mold, counterpart and pressure fluid having at least the working temperature . 29. The method according to claim 28, characterized in that compressed air is used as the pressure fluid. 30. intermediate product, for use in a method according to any one of claims 22 to 29, characterized by

• 1. a protective film made of a plastic that is easily removable from the dry heat seal;
• 2. a layer of dry thermoplastic heat-sealing adhesive applied over the entire surface of this protective film, which contains an electrically conductive pigment and which can be heat-activated at a temperature of 80 ° C or higher;
• 3. a grid, net or fabric at least partially embedded in this heat seal adhesive layer, which has a mesh size of less than 1 mm and which has a wire thickness of less than 100 μm and the metal wire is formed from a soft, pullable metal.

31. Intermediate product according to claim 30, characterized in that the heat seal adhesive is a water-dispersible adhesive is based on aliphatic polyurethanes (e). 32. Intermediate product according to claim 31, characterized in that the heat seal adhesive 10 to 40 wt .-% (based on the Solid weight of adhesive and pigment) contains electrically conductive pigment. 33. Intermediate product according to one of claims 30 to 31, characterized in that the electrically conductive pigment is a metal powder like Aluminum, copper, nickel, tin, brass or Bronze powder or carbon black, graphite or magnetite. 34. Intermediate product according to one of claims 30 to 32, characterized in that the electrically conductive pigment is carbon black or graphite.   35. Intermediate product according to claim 32, characterized in that the electrically conductive pigment is carbon black or graphite and also contains a metal powder that is made from Aluminum, copper, nickel, tin, brass or Bronze powder is selected. 36. Intermediate product according to one of claims 30 to 35, characterized in that the metal grid, mesh or mesh from a fine Metal wire made of aluminum, copper, nickel, tin or their alloys including brass. 37. Intermediate product according to one of claims 30 to 36, characterized in that the metal grid, mesh or mesh is a mesh has a width of 200 to 800 µm. 38. Intermediate product according to one of claims 30 to 37, characterized in that the intermediate product on both sides of a protective film is limited.