WO2022263063A1 - Utilisation d'un stratifié pour protéger contre un rayonnement électromagnétique - Google Patents

Utilisation d'un stratifié pour protéger contre un rayonnement électromagnétique Download PDF

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Publication number
WO2022263063A1
WO2022263063A1 PCT/EP2022/062726 EP2022062726W WO2022263063A1 WO 2022263063 A1 WO2022263063 A1 WO 2022263063A1 EP 2022062726 W EP2022062726 W EP 2022062726W WO 2022263063 A1 WO2022263063 A1 WO 2022263063A1
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WO
WIPO (PCT)
Prior art keywords
laminate
use according
electromagnetic radiation
iso
shielding
Prior art date
Application number
PCT/EP2022/062726
Other languages
German (de)
English (en)
Inventor
Ulrich Schneider
Original Assignee
Carl Freudenberg Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg Kg filed Critical Carl Freudenberg Kg
Priority to EP22729452.7A priority Critical patent/EP4355570A1/fr
Publication of WO2022263063A1 publication Critical patent/WO2022263063A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B32B5/265—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a non-woven fabric layer
    • B32B5/266—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a non-woven fabric layer next to one or more non-woven fabric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles

Definitions

  • the present invention relates to the use of a laminate for shielding against electromagnetic radiation.
  • Electromagnetic waves have an electric and a magnetic field component.
  • EMI mutual electromagnetic interference
  • B. electric in electric vehicles High-performance drives integrated in the smallest of spaces and controlled by electronic components. Li-ion batteries with the associated control electronics are used in many areas to store and provide electrical energy. It must be ensured that the individual components do not interfere with one another.
  • EMC electromagnetic compatibility
  • DIN VDE 0870 the concept of electromagnetic compatibility (EMC) is defined according to DIN VDE 0870, for example, as the ability of electrical equipment to function satisfactorily in its environment without inadmissibly influencing this environment, which may also include other equipment. This means that EMC must meet two conditions: shielding of the emitted radiation and immunity to interference from other electromagnetic radiation. In many countries, the corresponding devices must comply with legal regulations. According to DIN VDE 0870, electromagnetic interference (EMI) is the effect of electromagnetic waves on circuits, devices, systems or living beings. Such an impact can lead to acceptable or unacceptable impairments for the objects affected, e.g. B. the functionality of devices or the endangerment of persons. In such cases, appropriate protective measures must be taken.
  • the frequency range relevant for EMI shielding is generally between 100 Hz and 100 GHz, specifically from about 10 MHz to 10 GHz.
  • Electromagnetic compatibility of the components as well as energy saving and thermal management are the challenges for successful electromobility technology.
  • the use of modern brushless electric motors and various control units require the provision of electrical power in the form of alternating and three-phase current.
  • the electronic components emit unwanted magnetic, electrical and electromagnetic vibrations of different frequencies, which on the one hand can be a source of interference for other control units, or the control unit itself is disturbed in its function by the vibrations emitted by the other components.
  • EP 0998182 A2 (DE 69923142 T2) describes an electromagnetic shielding plate that can be mounted as a front panel in front of a screen in order to shield off electromagnetic radiation that emerges from the front of the screen.
  • the Electromagnetic shielding is provided by a conductive grid in which the individual lines must be sufficiently thin and spaced sufficiently so that the grid lines are not visible as far as possible.
  • a glass plate for example, is printed with a conductive paste to produce the grid pattern.
  • the DE 102005001063 A1 describes a layered material for shielding against electromagnetic waves, specifically in buildings.
  • the layered material comprises at least one fiber-comprising layer and at least one aluminum layer.
  • the fiber-encompassing layer can be a woven fabric, knitted fabric, warp-knitted fabric, scrim, fiber bundle and preferably non-woven fabric. It is described that both the aluminum layer and the fiber-encompassing layer can be provided with a perforation so that adhesive and bitumen can penetrate better into the material and gas can escape.
  • the aluminum layer can have an extensibility in at least one direction in the range from 2 to 35%, based on the length of the fiber-comprising layer in this direction.
  • WO 2008/130201 A2 teaches using a laminate for shielding electromagnetic waves, which laminate comprises a polymer resin layer and at least one metal foil layer. Compared to a pure metal foil, this laminate should be distinguished by good tensile stability and flexibility.
  • Embodiments of the invention relate to laminates having embossed areas on one or both surfaces, or laminates having perforated areas. The diameter of the perforated areas is preferably in a range from 10 ⁇ m to 5 mm. This involves making holes with a specific diameter in the laminate, ie punching, in which material is removed from the laminate. Through the embossed and/or perforated areas the laminate can be given a flexibility comparable to that of a metal fabric.
  • WO 2008/127077 A1 describes a thermally conductive layered material for shielding electromagnetic waves, which comprises an elastic carrier layer and at least one conductive layer laminated thereon.
  • the resilient backing has a pattern of a plurality of perforated areas and the conductive layer has conductive bumps formed by cuts in the conductive layer which are coaxial with the perforated areas of the resilient backing.
  • the conductive bosses are folded over toward the back of the elastic backing so that they traverse the perforated areas of the backing and protrude from the back of the elastic backing to contact the back of the elastic backing.
  • a thermal conductivity in the direction of the z-axis should be achieved.
  • the known simple laminates of at least one carrier layer, z. B. a polymer film or a fiber-containing layer, and at least one metal layer are only suitable to a limited extent for the sheathing of three-dimensional structures for shielding from electromagnetic waves, especially structures with a complex structure. These laminates lack sufficient formability.
  • a laminate as described in WO2021099163A1, comprising at least one metal foil, and b) a flat substrate, comprising or consisting of a fiber, film or foam material, the laminate comprising a multiplicity of objects formed by cuts in the base of the laminate, each object consisting of two or more cuts having a common starting point, and wherein the two cuts or any two adjacent cuts have an angle of 45 to 160°.
  • the laminate has very good mechanical and physical properties. It combines good electromagnetic shielding with good draping properties.
  • a disadvantage is a comparatively complex manufacture and the high production costs associated therewith.
  • the object of the present invention is to provide laminates for shielding electromagnetic radiation and a method for producing components that are shielded from electromagnetic radiation, which overcome the disadvantages described above and can be produced easily and inexpensively.
  • the laminates should also be suitable for the production of shielded components without having to be preformed. It should preferably be possible to form the components to be shielded in one operation and to connect them to the laminate for shielding against electromagnetic radiation. These include special injection molding processes such as back injection and multi-component injection molding, or forming processes such as thermoforming.
  • the laminates according to the invention should be suitable for use in a process for producing fiber composite materials, specifically an SMC process (extrusion molding of sheet molding compounds).
  • a laminate for shielding electromagnetic radiation which comprises a) at least one metal foil, and b) a flat substrate having a nonwoven fabric as the carrier material, the laminate and the nonwoven fabric being specially adjusted have physical and mechanical properties.
  • the invention relates to the use of a laminate comprising a) at least one metal foil, the metal foil having a thickness of 3 to 250 ⁇ m, and b) a flat substrate comprising a nonwoven fabric with a maximum tensile strength quotient determined according to ISO 9073-3 : 1989(E), longitudinal to transverse from 1:2 to 2:1, the laminate having a maximum tensile strength, longitudinal and/or transverse, determined according to ISO 9073-3: 1989(E) in the range from 50 to 800 N/5cm and has an elongation, measured longitudinally and/or transversely according to ISO 9073-3: 1989(E), of less than 30%, for shielding against electromagnetic radiation.
  • the laminates used according to the invention are sheet-like structures which have an essentially two-dimensional, planar extent and, in comparison, have a smaller thickness.
  • the laminates used according to the invention provided the laminate and the nonwoven have specially adjusted physical and mechanical properties, have sufficient deformability even without being provided with incisions and also without having to have high elongation. This enables simpler and more cost-effective manufacture.
  • the setting of a high isotropy of the maximum tensile force of the nonwoven seems to be particularly advantageous for obtaining a high deformability.
  • the combination of the metal foil with the special nonwoven surprisingly seems to result in the laminated metal foil having a higher extensibility than the unlaminated metal foil, which leads to a high deformability of the laminate even with comparatively low extensibility.
  • the laminate according to the invention for shielding electromagnetic radiation comprises at least one metal foil as component a).
  • Component a) can be one or more than one, e.g. B. 2, 3, 4, 5 or more than 5 metal foils or consist. In a preferred embodiment, component a) comprises 1, 2 or 3 metal foils. If component a) comprises more than one metal foil, there can be an adhesion-promoting layer between two metal foils.
  • the adhesion-promoting layer preferably comprises at least one polymer, preferably selected from thermoplastics or curable polymer compositions. Suitable curable polymer systems can be based on the polyesters, polyurethanes, epoxides and silicones known for this purpose.
  • Preferred thermoplastics are polyesters, polyamides, polyolefins and mixtures thereof.
  • Preferred polyesters are polyethylene terephthalate and polybutylene terephthalate.
  • Preferred polyolefins are polyethylene or polypropylene.
  • the metal of the metal foil is preferably selected from aluminum, titanium, magnesium, tin, nickel, copper, silver, gold, etc.
  • Metal alloys, preferably m-metal (permalloy), are also suitable.
  • the metal foil particularly preferably comprises aluminum or consists of aluminum.
  • the metal foil is cold rolled.
  • the metal of the metal foil is preferably an alloy, in particular an iron-silicon alloy.
  • preferred metals of the metal foil are metals and/or alloys that are used for electrical steel sheets.
  • the metal foil preferably has a thickness of from 3 to 250 ⁇ m, particularly preferably from 5 to 225 ⁇ m, in particular from 7 to 200 ⁇ m.
  • the laminate has a maximum tensile strength, determined longitudinally and/or transversely according to ISO 9073-3: 1989(E), in the range from 50 to 800 N/5cm, preferably from 100 to 700 N/5cm, more preferably from 150 to 700 N /5cm and in particular from 150 to 600 N/5cm.
  • the advantage of setting a maximum tensile force in the aforementioned ranges is that the laminate has good stability during processing.
  • the laminate has a longitudinal and/or transverse elongation, determined according to ISO 9073-3: 1989(E), of less than 30%, for example from 3% to 30%, more preferably from 3% to 25%, and in particular from 5% to 20%, up.
  • the metal foil and the flat substrate are preferably connected over the entire surface with a binder, preferably a thermoplastic.
  • a binder preferably a thermoplastic.
  • Preferred thermoplastics are polyesters, polyamides, polyolefins and mixtures thereof.
  • Preferred polyesters are polyethylene terephthalate and polybutylene terephthalate.
  • Preferred polyolefins are polyethylene or polypropylene.
  • the thermoplastic can also be multi-layered.
  • An adhesion promoter layer can be present between the binder and the metal foil and/or between the binder and the flat substrate.
  • the laminate is preferably in the form of sheet goods.
  • the laminate has no or at most one, preferably at most 0.5, more preferably at most 0.2 and in particular at most 0.1 incision (of a length of more than 1 mm) per 10 cm 2 in the area of its base area in the base area of the laminate on.
  • the number of cuts at least 10 samples with an area of 10 cm 2 are randomly selected from a total sample size of 2 m 2 , the number of cuts found per sample is determined and averaged over the total number of samples.
  • an incision refers to a partial or complete severing of the metal foil and possibly the flat substrate, without material being deliberately removed from the metal foil or the substrate in the process.
  • the incisions may be straight or curvilinear, eg circular or non-circular.
  • the laminate has no cuts in the base of the laminate, or only so few cuts that the ultimate tensile force, longitudinal and/or transverse, determined according to ISO 9073-3: 1989(E), through the cuts compared to a reference laminate the same structure but without incisions is reduced by a maximum of 150%, more preferably by a maximum of 100%, in particular by 50%.
  • the laminate has no cuts in the base surface of the laminate, or only so few cuts that the shielding, determined as the screening attenuation value, according to ASTM D-4935-2010 by the cuts, compared to a Comparative laminate of the same structure but without cuts is reduced by at most 60 dB, more preferably at most 50 dB, in particular by 40 dB.
  • the laminate for shielding electromagnetic radiation comprises as component b) a flat substrate comprising a nonwoven fabric with a quotient of maximum tensile strength, determined according to ISO 9073-3: 1989(E), longitudinal to transverse from 1:2 to 2:1, preferably from from 1.25:2 to 2:1.25, especially from 1.5:2 to 2:1.5.
  • the substrate b) can have one or more layers.
  • component b) consists of the nonwoven.
  • a special embodiment is a multi-layered substrate b).
  • non-woven fabric means a structure made up of fibers of limited length, continuous fibers (filaments) or chopped yarns of any kind and from any origin, which have been combined in any way into a fibrous layer or batt and in any way connected to one another; this is excluded the crossing or intertwining of yarns, as occurs in weaving, knitting, knitting, lace making, braiding and the manufacture of tufted products
  • Non-woven fabrics do not include foils and papers.
  • the fibers used to produce the nonwoven can be filaments, ie fibers with a principally endless length, and/or staple fibers. According to the invention, the fibers are preferably filaments. Staple fibers can be manufactured and laid using a wide variety of known manufacturing processes, for example carding processes, airlaid and wetlaid processes.
  • the substrate b) comprises at least one mechanically bonded nonwoven. In the case of mechanically bonded nonwovens, a fibrous web is z. B. solidified by a needling technique or by means of water jets.
  • the substrate b) comprises at least one thermally bonded nonwoven.
  • Thermally bonded nonwovens can e.g. B. by pressing at elevated temperature, for example by means of a calender or by hot air.
  • the fibrous web of thermally bonded nonwovens typically comprises fibers made from polyolefins, polyester and/or polyamide.
  • the substrate b) comprises at least one chemically bonded nonwoven.
  • the fiber web is provided with a fiber binder (e.g. acrylate binder) by impregnation, spraying or other conventional application methods and then hardened.
  • the fiber binder binds the fibers together to form a non-woven fabric.
  • the substrate b) comprises at least one spunbonded nonwoven (spunbond).
  • spunbonded nonwoven spunbonded continuous fibers (filaments) are stored and can then z. B. be solidified by treatment with heated rollers or by steam flow / hot air.
  • an engraving e.g. B. consist of circular, rectangular or diamond-shaped points. The threads fuse at the contact points and thus form the non-woven fabric.
  • a special version is a thermally bonded spunbonded nonwoven.
  • the basis weight of the nonwoven can vary within wide ranges.
  • a basis weight according to DIN EN 29073-1:1992-08 from 10 to is preferred 400 g/m 2 , preferably from 15 to 300 g/m 2 , in particular from 20 to 250 g/m 2
  • the substrate b) can additionally contain at least one additive.
  • Suitable additives are, on the one hand, fillers and reinforcing materials. These include particulate fillers, fibrous materials and any transitional forms. Particulate fillers can have a wide range of particle sizes, ranging from dusty to coarse-grained particles.
  • Organic or inorganic fillers and reinforcing materials can be used as the filler material. For example, inorganic fillers such as carbon fibers, kaolin, chalk, wollastonite, talc, calcium carbonate, silicates, titanium dioxide, zinc oxide, glass particles, z. B.
  • nanoscale phyllosilicates nanoscale aluminum oxide (AI2O3), nanoscale titanium dioxide (T1O2), phyllosilicates and nanoscale silicon dioxide (S1O2) can be used.
  • the fillers can also be surface treated. Suitable phyllosilicates are kaolins, serpentines, talcum, mica, vermiculite, lllite, smectite, montmorillonite, hectorite, double hydroxides and mixtures thereof.
  • the phyllosilicates can be surface-treated or untreated.
  • one or more fibrous materials can be used.
  • inorganic reinforcing fibers such as boron fibers, glass fibers, silicic acid fibers, ceramic fibers and basalt fibers; organic reinforcing fibers such as aramid fibers, polyester fibers, nylon fibers and polyethylene fibers; and natural fibers such as pile fibers, flax fibers, flax fibers and sisal fibers.
  • Suitable additives are also selected from antioxidants, heat stabilizers, flame retardants, light stabilizers (UV stabilizers, UV absorbers or UV blockers), catalysts for the crosslinking reaction, thickeners, thixotropic agents, surface-active agents, viscosity modifiers, lubricants, dyes, Nucleating agents, antistatic agents, mold release agents, defoamers, bactericides, etc..
  • the substrate b) can contain at least one binder.
  • Binders serve z. B. to improve the adhesion of fiber materials, especially nonwovens. They also serve to improve adhesion between different layers of the substrate b), z. B. between two layers of nonwoven fabric. Binders are also used to improve the adhesion of fillers and reinforcing materials and other additives used in component b).
  • Suitable binders include at least one polymeric material, preferably selected from polyvinyl alcohol, polyacrylates, polyurethanes, styrene butadiene rubber, nitrile butadiene rubber, polyester, epoxy and polyurethane resins.
  • the substrate b) comprises at least two layers, one of the layers being designed as a reinforcing insert (scrim).
  • a reinforcing insert for example, the adhesion between the two adjacent layers can be increased by using reinforcing inserts.
  • Suitable materials for the reinforcement insert are those mentioned above as fiber materials. A polyester is specifically used.
  • the fabrics described for this purpose made of fibers with threads crossing in two directions are generally suitable as reinforcing inserts. These usually have a significantly lower basis weight than the nonwovens described above.
  • the basis weight of the reinforcement insert is preferably in a range from 1 to 100 g/m 2 , preferably from 1 to 50 g/m 2 , in particular from 2 to 25 g/m 2 .
  • the substrate b) preferably has a thickness, measured according to ISO 9073-2:1995(E), of 50 to 1500 ⁇ m, particularly preferably of 100 to 1000 ⁇ m, in particular of 150 to 800 ⁇ m.
  • the substrate b) preferably has a maximum tensile strength, determined longitudinally and/or transversely according to ISO 9073-3: 1989(E), in the range from 50 to 800 N/5cm, preferably from 100 to 700 N/5cm, more preferably from 100 to 500 N/5cm and in particular from 100 to 350 N/5cm.
  • the advantage of setting a maximum tensile force in the aforementioned ranges is that the substrate b) has good stability during processing.
  • a spunbonded nonwoven in particular a polyester spunbonded nonwoven, is used to produce the substrate b) and is connected in a lamination process with at least one polymer material as a binder to form a multilayer composite material.
  • This preparation is carried out by conventional methods known to those skilled in the art, e.g. B. Thermobonding or lamination.
  • polymer material and/or non-woven fabric are plasticized at certain points by means of an embossing roller using high temperature and pressure, resulting in a bond between the two material webs. Extrusion is preferred. So e.g. B.
  • nonwoven-film substrate with the structure nonwoven-film-nonwoven two nonwoven webs are connected by means of a binder.
  • the plasticized binder can be extruded onto at least one web of material and then combined with another nonwoven web, followed by pressing and cooling. It is also possible for two webs of material to form a nip into which the binder is extruded, pressed with the webs of material and cooled. By repeating the extrusion and curing steps, these processes can be used to produce multilayer substrates b), it being possible for the layer sequence of the nonwoven layers and polymer layers to vary. If several nonwoven layers and/or several binder layers are provided, they can have the same composition or different compositions, e.g. B.
  • the The material properties can be influenced by the amount of binder applied, the type of binder, the temperature, the web speed and the line pressure. So you can z. B. control how long the binder is liquid between the webs, ie how well he can connect to the two webs. Thus z. B. control the adhesion between the material webs or the depth of penetration into the material webs.
  • the number of sheets to be laminated is not limited. It only has to be used for the required heating of the webs, e.g. B. a heating cylinder, are taken care of. In principle, not only nonwovens can be laminated with foils, but any conceivable combination (e.g. nonwovenA/woven; nonwoven/foil; nonwoven/foilA/woven; foil/foil; etc.).
  • the laminates for shielding electromagnetic radiation can be produced by connecting at least one metal foil a) and at least one flat substrate b) or their precursors to one another in a laminating process.
  • This connection is usually a material connection.
  • a positive and/or non-positive connection can take place.
  • a bond is formed by atomic or molecular forces between the connection partners.
  • the material connections of plastics include the glued connections and welded connections; Injection molding processes also lead to material connections.
  • a material connection is usually a non-detachable connection.
  • Form-fitting connections are created by the interlocking of at least two connection partners. As a result, the connection partners cannot become detached even without power transmission or when power transmission is interrupted. Non-positive connections require a normal force on the surfaces to be connected. Their mutual displacement is prevented as long as the counter-force caused by the static friction is not exceeded.
  • individual components e.g. B.
  • Non-curable or curable polymer systems in the form of one-component or multi-component systems can be used as binders.
  • Preferred binders are thermoplastics.
  • the lamination generally takes place at elevated temperature and/or under elevated pressure.
  • the methods already described above are suitable.
  • the components to be laminated can be guided through one or more roller nips in the form of layers as web material.
  • the components to be laminated in the form of a stack can be pressed at high temperature and pressure for a time sufficient to plasticize and optionally cure the binder and form a laminate.
  • the laminates according to the invention have a high resistance to tear propagation, both starting from the incisions in the laminates and in the event of undesired damage when sheathed or connected to at least one component.
  • the resistance of an incision to tear propagation under tensile stress is determined.
  • DIN 53356 (1982-08-01, Form A) determines the tear strength of nonwovens.
  • the tear propagation force is the force that occurs when the test sample is subjected to tensile stress, at which an incision continues to tear.
  • the laminates according to the invention preferably have a tear propagation strength, determined according to DIN 53356 (1982-08-01, Form A), in the range from 1 to 100 N, preferably from 2 to 80 N, in particular from 3 to 40 N.
  • the laminate enables the production of an opposite electromagnetic
  • Radiation-shielded component in which one:
  • the component is partially or completely coated or encased with the laminate.
  • a component which requires electromagnetic shielding is produced from at least one polymer material (c) or its precursor and connected to a laminate as described here. This connection is usually integral.
  • the laminate and the component can be produced in separate steps. Alternatively, those forming the laminate Components and the components forming the component to be shielded are connected to one another in a single step.
  • Polymer materials (c) within the meaning of the invention are materials which contain at least one polymer or consist of at least one polymer.
  • the polymeric materials (c) may contain at least one further component, e.g. B. fillers, reinforcing materials or additives different from them.
  • the polymer materials (c) are present in a special version as a composite (composite material).
  • the polymer component of the polymer material (c) is preferably selected from polyurethanes, silicones, fluorosilicones, polycarbonates, ethylene vinyl acetates, acrylonitrile butadiene acrylates, acrylonitrile butadiene rubbers, acrylonitrile butadiene styrenes, acrylonitrile methyl methacrylates, acrylonitrile styrene acrylates , cellulose acetates, cellulose acetate butyrates, polysulfones, poly(meth)acrylates, polyvinyl chlorides, polyphenylene ethers, polystyrenes, polyamides, polyolefins, polyketones, polyetherketones, polyimides, polyetherimides, polyethylene terephthalates, polybutylene terephthalates, fluoropolymers, polyesters, polyacetals, liquid crystal polymers, polyether sulfones, epoxy resins, phenolic
  • the polymer material (c) in step i.1) is provided in the form of a composite material which comprises the polymer component of the polymer material (c) and at least one further component (K) which is preferably selected from polymers, polymeric materials, textile materials, ceramic materials, mineral materials and Combinations thereof, particularly preferably selected from reinforced and/or filled plastic materials, polymer films, polymer moldings and combinations thereof.
  • the polymer material (c) in the form of a composite material which comprises at least one fibrous reinforcing material, the fibers preferably being selected from glass fibers, carbon fibers, aramid fibers, polyester fibers and combinations thereof.
  • the polymer material (c) is provided in the form of a composite material which comprises a fibrous reinforcing material which is embedded in a thermoplastic matrix (organic sheet).
  • step ii.1) the laminate and the polymer material (c) or its precursor are subjected to shaping, with the laminate and the polymer material being bonded.
  • SMC processing one can proceed in such a way that a laminate according to the invention is positioned in the cavity of the mold and subjected to a pressing process together with at least one polymer material.
  • the polymer material is also used in the form of a flat substrate, which is obtained by mixing and tailoring at least one polymeric binder, at least one fiber material and optionally at least one additive. This creates an SMC semi-finished product that can be processed together with the laminate according to the invention by extrusion to form an electromagnetically shielded component.
  • an in-moulding process is used to produce a component that is shielded from electromagnetic radiation.
  • Back injection molding produces components that consist of a polymer substrate and another plasticizable polymer material.
  • Laminate according to the invention can be used as the polymeric substrate.
  • There are various techniques for back injection molding such as inmold decoration (IMD), film insert molding (FIM), inmold labeling (IML), inmold coating (IMC) or inmold painting (IMP). What they all have in common is that the laminate is placed in an injection molding tool and then back-injected with another plastic and shaped, resulting in an electromagnetically shielded component part.
  • a forming process is used to produce a component that is shielded from electromagnetic radiation.
  • a laminate, as defined above, and at least one component are provided in step i.2) and the component is then partially or completely coated with the laminate in step ii.2). or sheathed.
  • the laminate can first be adapted to the geometry of the component to be electromagnetically shielded. So the laminate by cutting and / or punching in the desired shape can be brought. All imaginable contours are possible. It is also possible to make folds, e.g. B. to create a housing in which the component can be inserted.
  • the laminates described, as defined above, are preferably used for shielding electromagnetic radiation, preferably from current-carrying systems and current storage devices, particularly preferably in electronic housings.
  • An electric vehicle is generally a means of transport that is powered at least temporarily or partially with electrical energy.
  • the energy can be generated in the vehicle, stored in batteries or supplied temporarily or permanently from outside (e.g. through busbars, overhead lines, induction, etc.), with combinations of different forms of energy supply being possible.
  • Battery-powered vehicles are also known internationally as Battery Electric Vehicles (BEV).
  • Electric vehicles are road vehicles, rail vehicles, water vehicles or aircraft, such as electric cars, electric scooters, electric motorcycles, electric tricycles, battery and trolley buses, electric trucks, electric trains (trains and trams), electric bicycles and electric scooters.
  • Electric vehicles within the meaning of the invention are also hybrid electric vehicles (Hybrid Electric Vehicle, HEV) and fuel cell vehicles (Fuel Cell (Electric) Vehicle, FC(E)V).
  • HEV Hybrid Electric Vehicle
  • FC(E)V Fuel cell vehicles
  • electrical energy is generated from hydrogen or Methanol is generated by a fuel cell and converted directly into motion with the electric drive or temporarily stored in a battery.
  • electromobility there are four core areas in which the shielding of electromagnetic radiation is of critical importance: the power electronics, the battery, the electric motor and the navigation and communication equipment.
  • the laminates used according to the invention are advantageously suitable for the production of electronic housings for e-mobility vehicles in these four areas.
  • Modern electric vehicles are based on brushless electric motors, such as asynchronous machines or permanently excited synchronous machines (brushless DC machines).
  • the electric motor acts as a generator and supplies an AC voltage that can be rectified by the inverter and fed to the traction battery (recuperation).
  • Both fuel cells and the batteries in electric cars deliver higher voltages than the 12 V direct current or 24 V direct current known in the automotive sector.
  • a low-voltage vehicle electrical system is still required for many components of the on-board electronics.
  • DC/DC converters are used, which convert the high battery voltage into a correspondingly lower voltage and feed loads such as air conditioning, power steering, lighting, etc.
  • Another important power electronics component in electric cars is the onboard charger. Electric vehicle charging stations provide either single-phase or three-phase alternating current or direct current. Direct current is absolutely necessary to charge the traction batteries, which can be charged with the help of an onboard charger by rectifying and converting the Alternating current is generated.
  • the substrates used according to the invention are particularly suitable for shielding electromagnetic radiation from inverters, DC/DC converters and onboard chargers.
  • the laminates according to the invention are also particularly suitable for shielding navigation and communication devices, such as specifically GPS systems, from electromagnetic radiation.
  • a thermally bonded polyester spunbonded nonwoven (component b) with a weight per unit area of 100 g/m 2 and an aluminum foil (component a) with a thickness of 50 ⁇ m are laminated with polypropylene as a binder.
  • the polyester spunbonded nonwoven has a maximum tensile strength ratio, determined according to ISO 9073-3: 1989(E), longitudinal to transverse of 1.2.
  • a polymer coating is applied as a binder to the aluminum foil by means of triple extrusion using a sheet die, which consists of a layer of an adhesion promoter polymer, followed by a polypropylene layer (PP) and a second layer of an adhesion promoter polymer.
  • the temperature at the exit of the extruder is 240 °C.
  • the polyester spunbonded nonwoven is fed to the hot polymer layer and then pressed in a calender with two rolls at elevated temperature and a linear pressure of about 30 N/mm.
  • the laminate obtained has a maximum tensile strength, determined according to ISO 9073-3: 1989(E), of 450 N/5cm lengthwise and 395 N/5cm crosswise, and an elongation, determined according to ISO 9073-3: 1989(E), of 11 % (longitudinal) and 13.5 (transverse).
  • the screening attenuation values are determined on the laminate obtained in accordance with ASTM D-4935-2010. As shown in the table below, the laminate has very good shielding values, which are higher than those of a laminate constructed analogously but provided with incisions.
  • Example 1 The laminate produced in Example 1 is subjected to a deformation test according to the following scheme:
  • a circular sample with a diameter of 24 cm is clamped in a circular metal holding ring so that the area to be tested has a diameter of 22 cm.
  • This retaining ring is clamped in a device, with a deformation space of sufficient size being reserved.
  • the pattern is preheated to 180°C using IR heating and then shaped with a metal ball mounted on a stamp.
  • the metal ball is unheated, has a diameter of 7cm and hits the center at a speed of 40mm/sec.
  • the depth of penetration before the aluminum foil tears defines the maximum deformability under these conditions.
  • the penetration depth of the bullet in example 1 is 3 cm, the penetration depth on the unlaminated aluminum foil from example 1 is 1.5 cm. Despite its low elongation, the laminate consequently has sufficient deformability.
  • Shielded components can thus be manufactured with the laminate without the laminates having to be preformed. Furthermore, it is possible to form the components to be shielded in one operation and to connect them to the laminate for shielding against electromagnetic radiation.
  • Various injection molding processes such as back injection molding and multi-component injection molding, or forming processes, such as thermoforming, can be used for this purpose.
  • the laminates according to the invention are suitable for use in a process for producing fiber composite materials, specifically an SMC process (extrusion molding of sheet molding compounds).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical 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

La présente invention concerne l'utilisation d'un stratifié comprenant a) au moins une feuille métallique, la feuille métallique ayant une épaisseur de 3 à 250 μm, et b) un substrat de type feuille, comprenant un non-tissé ayant un rapport de résistances à la traction, déterminées selon la norme ISO 9073-3 : 1989(E), longitudinale sur transversale, de 1 : 2 à 2 : 1, le stratifié ayant une résistance à la traction, déterminée dans la direction longitudinale et/ou transversale, selon la norme ISO 9073-3 : 1989(E), dans la plage allant de 50 à 800 N/5 cm, et un allongement, déterminé dans la direction longitudinale et/ou transversale, selon la norme ISO 9073-3 : 1989(E), inférieur à 30 %, pour protéger contre des rayons électromagnétiques.
PCT/EP2022/062726 2021-06-14 2022-05-11 Utilisation d'un stratifié pour protéger contre un rayonnement électromagnétique WO2022263063A1 (fr)

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DE102021115269.0A DE102021115269A1 (de) 2021-06-14 2021-06-14 Verwendung eines Laminats zur Abschirmung elektromagnetischer Strahlung

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06216556A (ja) * 1993-10-18 1994-08-05 Hiraoka & Co Ltd 電磁波シールド性積層シート
EP0998182A2 (fr) 1998-10-30 2000-05-03 Sumitomo Chemical Company, Limited Couche de blindage électromagnétique
DE10334714A1 (de) * 2002-08-07 2004-04-15 Henkel Kgaa Funktioneller, elektromagnetische Strahlung dämpfender Verbundstoff
DE102005001063A1 (de) 2005-01-07 2006-07-20 Johns Manville Europe Gmbh Verwendung von Schichtmaterialien zur Abschirmung von elektromagnetischen Wellen
WO2008127077A1 (fr) 2007-04-17 2008-10-23 Nano Interface Technology Feuille à rayonnement thermique de blindage contre les ondes électromagnétique et son procédé de fabrication
WO2008130201A2 (fr) 2007-04-24 2008-10-30 Nano Interface Technology Feuille stratifiée pour mise à la terre et protection contre les rayonnements électromagnétiques
WO2021099163A1 (fr) 2019-11-21 2021-05-27 Carl Freudenberg Kg Stratifié flexible pour le blindage contre les rayonnements électromagnétiques

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06216556A (ja) * 1993-10-18 1994-08-05 Hiraoka & Co Ltd 電磁波シールド性積層シート
EP0998182A2 (fr) 1998-10-30 2000-05-03 Sumitomo Chemical Company, Limited Couche de blindage électromagnétique
DE69923142T2 (de) 1998-10-30 2005-12-29 Sumitomo Chemical Co. Ltd. Elektromagnetische Abschirmplatte
DE10334714A1 (de) * 2002-08-07 2004-04-15 Henkel Kgaa Funktioneller, elektromagnetische Strahlung dämpfender Verbundstoff
DE102005001063A1 (de) 2005-01-07 2006-07-20 Johns Manville Europe Gmbh Verwendung von Schichtmaterialien zur Abschirmung von elektromagnetischen Wellen
WO2008127077A1 (fr) 2007-04-17 2008-10-23 Nano Interface Technology Feuille à rayonnement thermique de blindage contre les ondes électromagnétique et son procédé de fabrication
WO2008130201A2 (fr) 2007-04-24 2008-10-30 Nano Interface Technology Feuille stratifiée pour mise à la terre et protection contre les rayonnements électromagnétiques
WO2021099163A1 (fr) 2019-11-21 2021-05-27 Carl Freudenberg Kg Stratifié flexible pour le blindage contre les rayonnements électromagnétiques

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