WO1999030902A1 - Piece moulee emboutie profond, a fine paroi et a protection electromagnetique, procede permettant de la produire et produit intermediaire s'utilisant dans le cadre dudit procede - Google Patents

Piece moulee emboutie profond, a fine paroi et a protection electromagnetique, procede permettant de la produire et produit intermediaire s'utilisant dans le cadre dudit procede Download PDF

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Publication number
WO1999030902A1
WO1999030902A1 PCT/EP1998/008183 EP9808183W WO9930902A1 WO 1999030902 A1 WO1999030902 A1 WO 1999030902A1 EP 9808183 W EP9808183 W EP 9808183W WO 9930902 A1 WO9930902 A1 WO 9930902A1
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WIPO (PCT)
Prior art keywords
mesh
electrically conductive
metal
adhesive
conductive pigment
Prior art date
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Ceased
Application number
PCT/EP1998/008183
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German (de)
English (en)
Inventor
Curt Niebling
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AU22727/99A priority Critical patent/AU2272799A/en
Publication of WO1999030902A1 publication Critical patent/WO1999030902A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • B29C70/882—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding
    • B29C70/885—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding with incorporated metallic wires, nets, films or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0008—Magnetic or paramagnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0015—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer

Definitions

  • the present invention relates to a thin-walled, electromagnetically shielding, deep-drawn molded part and a method for its production.
  • the invention further relates to an intermediate product which can be used in this process.
  • the molded parts according to the invention can be used in particular for housing electrical and / or electronic devices which generate electromagnetic interference radiation.
  • the molded parts according to the invention can preferably be used as screen housings or screen housing parts of mobile telephones, computers, laptops, shavers and the like, and for covering printed circuit boards.
  • German Offenlegungsschrift 36 01 153 discloses a deep-drawn molded part and a method for its production.
  • a second layer made of a non-deep-drawable material is applied, and subsequently both layers are deformed together using deep-drawing.
  • the non-thermoformable material can be braids, fabrics or nonwovens made of metal. If this second layer consists of certain metals, the shielding properties of metals against electromagnetic radiation can be exploited, as a result of which molded plastic parts can be produced with a favorable shielding effect.
  • the second layer Before the deep-drawing process, the second layer can be temporarily adhered to the first layer, for example with the aid of an adhesive. This document contains no information on the type and selection of this adhesive.
  • adhesives that are supposed to bond another material with thermoplastic materials are electrically non-conductive, organic materials.
  • the adhesive creates a well-adhering, electrically non-conductive insulating layer on the metal structure.
  • the presence of this insulating layer causes difficulties if the metal structure of the molded part, which acts as a Faradey * cage, is later to be connected to device components in an electrically conductive manner.
  • the deep-drawing process described in DE-OS 36 01 153 is not comparable to the high-pressure deep-drawing process of DE-OS 38 44 584.
  • the object of the present invention is to provide easy-to-manufacture, thin-walled, deep-drawn molded plastic parts which are provided with an integrated shield against electromagnetic radiation and which have an electrical contact resistance of less than 200 milliOhm. These molded parts should preferably be usable as screen housings in the mobile radio sector.
  • One embodiment of the solution to this problem according to the invention is a thin-walled, electrically shielding, deep-drawn molded part with a layer of a cold-stretchable film material to which a fine-particle, electrically conductive pigment-containing heat seal adhesive, a grid, mesh or fabric is laminated , which has a mesh size of less than 1 mm and which is formed from a metal wire having a wire thickness of less than 100 ⁇ m from a soft / drawable metal.
  • Another embodiment of the solution of the above object relates to a method for producing a thin-walled, deep-drawn molded part provided with an integrated electro-magnetic shield.
  • a flat multilayer composite material which has at least one layer of a cold-stretchable film material, is directly and directly pressurized with a pressure fluid at a working temperature below the softening temperature and is suddenly molded onto the mold cavity of a negative mold or positive mold at a pressure fluid pressure greater than 20 bar Solution to the above problem, characterized in that a lattice, mesh or fabric is laminated to the flat cold-stretchable film material with the aid of heat seal adhesive, which contains a finely divided, electrically conductive pigment, which has a mesh size of less than 1 mm and which consists of one, one Wire thickness less than 100 ⁇ m metal wire is formed from a soft, pullable metal; and the composite material thus obtained is deformed.
  • the composite material used in the above-mentioned process can be produced by applying the specific, flowable heat-sealing adhesive containing an electrically conductive pigment to the cold-stretchable film material, applying the specific metal structure to this adhesive layer and the layer material thus obtained under the action of heat and Pressure is laminated.
  • a previously produced and independently manageable preliminary or intermediate product can be provided, which has the metal structure and the specific heat seal adhesive.
  • an intermediate product for use in the aforementioned method, which comprises: a protective film made of a plastic that is easily removable from the dry heat seal adhesive; a dry thermoplastic heat seal adhesive layer applied to this protective film, which contains an electrically conductive pigment and which can be heat activated at a temperature of 80 ° C or higher, a grid, mesh or fabric which is adjacent to and / or at least partially embedded in the heat seal adhesive layer and has a mesh size has less than 1 mm and which is formed from a metal wire having a wire thickness of less than 100 ⁇ made of a soft, pullable metal.
  • 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 a layer of cold-stretchable film material serving as a base or support for the molded part; a certain metal structure which - in the sense of a Faraday 'see cage - provides the required shielding against electromagnetic radiation; and a selected adhesive that connects the metal structure to the film material and that increases the shielding attenuation of the molded part due to its electrical conductivity.
  • the cold-deformable film materials used are preferably polycarbonates (for example the MACROLON grades sold by BAYER AG), ABS polymers (butadiene / acrylonitrile / styrene polymers), polyesters, in particular aromatic polyesters (for example polyalkylene terephthalates), poly amides (for example PA 6 or PA 66 grades, furthermore high-strength aramide films), polyimides (for example the films sold under the trade name "CAPTON”) and also the copolymers of tetrafluoroethylene and hexafluoropropylene known under the name FEB.
  • polycarbonates for example the MACROLON grades sold by BAYER AG
  • ABS polymers butadiene / acrylonitrile / styrene polymers
  • polyesters in particular aromatic polyesters (for example polyalkylene terephthalates), poly amides (for example PA 6 or PA 66 grades, furthermore high-strength aramide films), polyimides (
  • Metal meshes made of very thin metal wires are preferably used, for example with wire thicknesses of 20 to 60 ⁇ m, because such metal meshes can be easily deformed under the deep-drawing conditions provided according to the invention and have no restoring force after the deformation. Particularly good results are achieved with a fabric made of copper wire, which has a wire thickness of approximately 50 ⁇ m, the fabric having a mesh size of approximately 460 ⁇ m. Annealed copper grids of this type are particularly preferred because the preceding annealing further reduces the bending stiffness of the copper wire.
  • Such metal meshes are commercially available, for example from wire weaving mills that produce screen printing meshes.
  • the dispersibility of these organic polymers in water is based on the polyol used to produce the polyurethane having ionic groups such as carboxylic acid groups or quaternary ammonium groups is substituted.
  • Aqueous dispersions which contain finely divided, dispersed, thermoplastic polyurethane which is suitable as a heat seal adhesive in the context of the present invention are described, for example, in US Pat. No. 4,147,679 (Scriven et al.).
  • heat seal adhesives based on aliphatic, thermoplastic polyurethanes are commercially available. Depending on the water content, these water-dispersed thermoplastic polyurethanes are highly viscous masses with a flow behavior reminiscent of honey.
  • a hardener can also be incorporated into the adhesive.
  • an aliphatic polyisocyanate such as one of the DESMODUR types (trademark of BAYER AG)
  • the hardener can be used as the hardener.
  • an addition of hardener of 0.5 to 2.5% by weight is sufficient and expedient.
  • an independently manageable and storable intermediate product consisting of protective film, heat seal adhesive and metal structure is provided, such a hardener additive should be avoided.
  • the system of glue and hardener gradually crosslinks even at room temperature, whereby the thermoplastic properties are lost.
  • a heat seal adhesive without hardener should therefore preferably be provided for such an intermediate product.
  • such a heat seal adhesive which contains a sufficient amount of electrically conductive pigment so that the finished deep-drawn part according to the invention has an electrical contact resistance of less than 200 milliOhm.
  • Suitable electrically conductive pigments include metal powders such as powdered aluminum, copper, nickel, tin, brass or bronze, or carbon in the form of carbon black or graphite, or electrically conductive metal oxides such as magnetite.
  • Preferred electrically conductive pigments are carbon black or graphite, which can be distributed well in aqueous adhesive dispersions of the type considered here. Furthermore, the tendency to phase separation and settling or suspension is low.
  • the dispersibility and the separation behavior of the pigments in / from the aqueous adhesive dispersion is also influenced by the particle size of the pigments.
  • the particle size of the pigments In the case of carbon black as the conductive pigment, types with an average primary particle size of 50 nm or less are preferably used.
  • introduced metal powders can have a grain size smaller than 5 ⁇ m, preferably a grain size smaller than 2 ⁇ m. point. Such pigments can easily be uniformly distributed in the aqueous adhesive dispersion by stirring.
  • a preliminary or intermediate product which consists of a protective film, the metal structure and the dried, but still heat-activated heat seal adhesive layer.
  • the protective film is intended to facilitate production and handling and is used in particular to prevent the composite material from passing through a heated roller pair to prevent adhesive from sticking to one of these rollers.
  • the protective film should be easy to remove from the dried adhesive.
  • a largely inert protective film made of polyethylene, polypropylene, polyester or polyfluorocarbon is preferably provided.
  • a layer thickness of the protective film of less than 50 ⁇ m is typically completely sufficient;
  • a protective film made of the polymers mentioned can be used with a layer thickness of 20 to 40 ⁇ m.
  • the heat-seal adhesive filled with electrically conductive pigment is applied to the entire surface of the flat protective film.
  • the adhesive layer can be applied, for example, using the screen printing method. Experiments have shown that the ultimate adhesive strength also depends on the layer thickness of the adhesive. Within certain limits, a higher layer thickness increases the adhesive strength that can be achieved.
  • the layer thickness of the adhesive layer should be about 5 to 50 ⁇ m; a layer thickness of approximately 15 to 30 ⁇ m is preferably provided. In order to achieve such layer thicknesses, it is advisable to apply the screen several times. Alternatively, other methods of applying the flowable, highly viscous adhesive can also be provided, such as spreading with the aid of a doctor blade, or lamination with the aid of rollers.
  • the metal structure is placed on the adhesive layer, pressed into the liquid or plastic adhesive mass and fixed in places. This composite is then dried, for example with hot air in a continuous oven.
  • the liquid adhesive with the electrically conductive pigment is applied over the entire surface of the protective film.
  • This composite is dried, for example with hot air in a continuous oven.
  • the metal structure is then placed on the dried adhesive layer.
  • Another protective film is placed on the metal structure. This association is through a heated pair of rollers and connected or laminated together. One of the two protective films is removed before further processing.
  • the intermediate product thus obtained is stored until further processing.
  • the adhesive which is preferably not mixed with hardener and therefore not crosslinked, remains thermoplastic and heat-activatable and can be joined in a later step by the action of heat to the cold-stretchable film material provided according to the invention.
  • this preliminary or intermediate product is an independently manageable and storable product on the way to the production of a molded part according to the invention.
  • the flat, cold-stretchable film material provided for the molded part is provided, for example an ABS film or a polycarbonate film, in particular an electrically conductive ASA film with a layer thickness of approximately 200 ⁇ m.
  • the intermediate product is placed on this film so that the protective film is removed from the cold-stretchable film.
  • the composite material thus obtained is heated to activate the adhesive.
  • heating takes place to a temperature above the activation temperature of the heat seal adhesive and below the softening temperature of the cold-stretchable film material. Typically, it is heated to a temperature in the range from 80 to 140 ° C. Heating to rather low temperatures in the range of approximately 80 to 100 ° C.
  • the composite material can be produced in the form of endless webs, from which certain outlines are later punched out, which are fed to the high-pressure molding for producing molded parts according to the invention.
  • the already cut intermediate product can be partially placed on an endless web of the cold-stretchable film in the sections where deep-drawing is to be carried out.
  • This section of cold-stretchable film provided with a metal structure and adhesive layer is passed through a pressing apparatus in order to permanently connect the metal structure to the cold-stretchable film under the action of heat and pressure.
  • This endless sheet material is then fed to the deep-drawing process in sections.
  • the cold-stretchable film material and the intermediate product can each be provided in the desired outline, which are fed to the immediately subsequent high-pressure deformation after the lamination, while still warm. In this case, reheating of the composite material to the working temperature of the high-pressure deformation step is avoided.
  • molded parts according to the invention can be produced in a plurality of immediately successive work steps.
  • 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 about 80 and 100 ° C, a pressing time between about 100 WO 99/30902 -1 -4.- PCT / EP98 / 08183
  • the flat multilayer composite material can be deformed to form the molded part according to the invention by known deep-drawing processes.
  • an isstatic high-pressure deformation is preferably provided, in which a pressure fluid of more than 20 bar acts directly and directly on the flat multilayer composite material and abruptly forms it on the mold cavity of a negative mold or positive mold.
  • a pressure fluid of more than 20 bar acts directly and directly on the flat multilayer composite material and abruptly forms it on the mold cavity of a negative mold or positive mold.
  • German Offenlegungsschrift 38 44 584 and the associated patent document 38 40 542.
  • a device for carrying out this isostatic high-pressure deformation process is described in detail in German Patent 41 13 568.
  • the moldings obtained after this isostatic high-pressure deformation are thin-walled; their wall thickness is usually only a few 100 micrometers. Typically, the molded parts had an essentially uniform layer thickness of less than 1.2 mm in all surface sections. If necessary, these moldings can be back-injected with additional synthetic resin.
  • Metal structure namely a metal mesh made of copper wire with a smooth weave and a mesh size of 458 ⁇ m; the copper wire has a wire thickness of 50 ⁇ m.
  • a copper wire mesh can be obtained, for example, from Spoerl GmbH, D-72517 Sigmaringendorf.
  • Heat seal adhesive in the form of an aqueous dispersion of various aliphatic polyurethanes, which has already been mixed with about 20% by weight of carbon black and has been prepared for use by the manufacturer. (Such an adhesive was provided on a trial basis by Konrik Pröll GmbH & Co., D-91781-enburg and is based on the AQUAPRESS HT grade (registered trademark of Wegrik Pröll GmbH & Co.)).
  • a cut-out piece of copper wire fabric with the same dimensions is placed on the wet adhesive layer.
  • the layer material produced in this way is transferred by hand to a pressing apparatus and there at a temperature
  • REPLACEMENT SHEET HEGEL26
  • the still warm composite material is placed by hand on the wide frame of a negative mold, the mold cavity of which depicts a square board housing with a side length of approximately 40 mm and a depth of approximately 8 mm.
  • the copper wire mesh lies on the form edge.
  • the press is closed until the edge of the counterpart lies close to the top of the film.
  • the mold is closed under a hydraulic medium pressure of approximately 100 t.
  • Heated compressed air which has a temperature of approximately 120 ° C., is blown in through the counterpart.
  • the compressed air supply is controlled by an inlet valve that remains open for about 1 lake.
  • the inlet valve is then closed and an outlet valve is opened in order to relieve the pressure on the entire interior of the mold.
  • the mold is then opened and the deep-drawn sheet is removed.
  • the copper wire mesh has undergone this sudden high-pressure deformation without cracking and / or other recognizable, significant change in the fabric texture.
  • the layer thickness of the board housing is uniform in every cross-section.
  • the edge of the board housing is cut to a width of about 10 mm.
  • the circuit board housing is then attached to a printed circuit board in the usual way.
  • the electrical contact resistance is measured using conventional methods and is approximately 160 milliOhm.
  • the quadratic surface resistance is measured on the board housing using the so-called four-point measuring method. Based on the measured value, a shielding attenuation of about 72 dB is expected.
  • Such shield housings are suitable for use in the mobile radio sector.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une pièce moulée emboutie profond, à fine paroi et à protection électromagnétique, qui comprend une couche de matériau pelliculaire étirable à froid, sur laquelle peut être contrecollé, une grille, un réseau ou un tissu à l'aide d'un adhésif de thermocollage contenant un pigment électroconducteur à fines particules et dont l'ouverture des mailles est inférieure à 1 mm, et qui consiste en un fil métallique dont l'épaisseur est inférieure à 100 mu m et qui est réalisé(e) dans un matériau mou, étirable. De par leur faible résistance de contact électrique et de leur effet écran important, les pièces moulées de ce type s'utilisent par exemple comme boîtiers de protection dans le domaine radiotéléphonique mobile. Pour réaliser cette pièce moulée, un matériau composite, plan au départ, comprenant un film étirable, une couche d'adhésif de thermocollage et une structure métallique, peut être soumise, à une température de travail inférieure à la température de ramollissement du matériau pelliculaire, immédiatement et directement à l'action d'un fluide sous pression, de préférence de l'air comprimé, puis être moulé brusquement, à une pression du fluide sous pression supérieure à 20 bar, sur la cavité d'un moule négatif ou d'un moule positif.
PCT/EP1998/008183 1997-12-16 1998-12-14 Piece moulee emboutie profond, a fine paroi et a protection electromagnetique, procede permettant de la produire et produit intermediaire s'utilisant dans le cadre dudit procede Ceased WO1999030902A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU22727/99A AU2272799A (en) 1997-12-16 1998-12-14 Thin-walled, electromagnetic shielding, deep-drawn shaped part, method for the production thereof, and an intermediate product which can be utilized during saidmethod

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997155952 DE19755952C1 (de) 1997-12-16 1997-12-16 Dünnwandiges, elektro-magnetisch abschirmendes, tiefgezogenes Formteil, Verfahren zu dessen Herstellung, und ein bei diesem Verfahren einsetzbares Zwischenprodukt
DE19755952.2 1997-12-16

Publications (1)

Publication Number Publication Date
WO1999030902A1 true WO1999030902A1 (fr) 1999-06-24

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AU (1) AU2272799A (fr)
DE (1) DE19755952C1 (fr)
WO (1) WO1999030902A1 (fr)

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US6569681B1 (en) 2000-03-14 2003-05-27 Transkaryotic Therapies, Inc. Methods of improving homologous recombination
DE10252157A1 (de) * 2002-11-09 2004-06-03 Haver & Boecker Flächiges Verbundmaterial sowie Verfahren zur Herstellung
US6982023B2 (en) * 2001-11-30 2006-01-03 Asahi Glass Company, Limited Electromagnetic wave shielding filter and its production process
EP1914662A1 (fr) * 2006-10-20 2008-04-23 Franz Angerer Système RFID et procédé RFID

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DE10048527A1 (de) * 2000-09-25 2002-04-11 Daniel Ostmann Mittel zur HF-Schirmung und Verfahren zum Einbringen des Schirmungsmittels in Plastgehäuse
DE10259499A1 (de) * 2002-12-19 2004-07-01 Bayer Ag Elektrostatisch lackierbare Formteile in Verbundtechnik
DE102011077187B4 (de) 2011-06-08 2018-05-17 Lisa Dräxlmaier GmbH Abschirmung und Herstellung einer solchen Abschirmung

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DE3601153A1 (de) * 1986-01-16 1987-08-06 Theodor Lentjes Tiefzieh-formteil und verfahren zu dessen herstellung
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US5108530A (en) * 1988-12-01 1992-04-28 Bayer Aktiengesellschaft Method of producing a deep-drawn formed plastic piece
EP0633718A1 (fr) * 1993-07-07 1995-01-11 Durmont Teppichbodenfabrik Ag Méthode de la fabrication de blindage pour éléments appareils ou équipement électriques ou électroniques, et dispositif de blindage fabriqué de ladite méthode

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DE4113568C1 (fr) * 1991-04-25 1992-05-21 Curt 8122 Penzberg De Niebling

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Publication number Priority date Publication date Assignee Title
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US6569681B1 (en) 2000-03-14 2003-05-27 Transkaryotic Therapies, Inc. Methods of improving homologous recombination
US6982023B2 (en) * 2001-11-30 2006-01-03 Asahi Glass Company, Limited Electromagnetic wave shielding filter and its production process
DE10252157A1 (de) * 2002-11-09 2004-06-03 Haver & Boecker Flächiges Verbundmaterial sowie Verfahren zur Herstellung
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DE19755952C1 (de) 1998-12-10

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