Flexible laminate for shielding electromagnetic radiation

Patent metadata

Field	Value
Publication number	US-11792966-B2
Application number	US-202017778009-A
Country	US
Kind code	B2
Filing date	Nov 9, 2020
Priority date	Nov 21, 2019
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A flexible laminate for shielding against electromagnetic radiation includes: a) at least one metal foil; and b) a sheet-like substrate made of a fiber material, film material, or foam material. The laminate includes a plurality of objects formed by incisions into a base area of the laminate. Each object of the plurality of objects is made of two or more incisions having a common initial point. The two or more incisions, or each of two adjacent incisions of the two or more decisions, define an angle of 45° to 160°.

First claim

The invention claimed is:

1. A flexible laminate for shielding against electromagnetic radiation, comprising:
a) at least one metal foil; and
b) a sheet-like substrate comprising a fiber material, film material, or foam material,
wherein the laminate comprises a plurality of objects formed by incisions into a base area of the laminate,
wherein each object of the plurality of objects comprises two or more incisions having a common initial point, and
wherein the two or more incisions, or each of two adjacent incisions of the two or more incisions, define an angle of 45° to 160°, and
wherein each incision of the two or more incisions completely perforates the at least one metal foil and completely perforates the sheet-like substrate.

2. The laminate of claim 1 , wherein each object comprises two or more straight incisions.

3. The laminate of claim 1 , wherein each object is formed of 2, 3, 4, 5, or 6 incisions.

4. The laminate of claim 1 , wherein each object is formed of x incisions,
wherein x is 3, 4, 5, or 6, and
wherein each of two adjacent incisions define an angle of (360/x)°+/−20°.

5. The laminate of claim 1 , wherein all objects of the plurality of objects have a type of symmetry comprising:
at least three-fold rotational symmetry,
axis symmetry having at least two reflection symmetry axes,
an inversion center, or
at least three-fold rotational symmetry axis.

6. The laminate of claim 1 , wherein the objects form groups, and
wherein all objects of a group have identical shape, size, and spatial arrangement, and common initial points of all objects of one group are on a straight line.

7. The laminate of claim 6 , wherein the groups form a pattern, and
wherein the pattern comprises 1, 2, 3, 4, or more than 4 groups of objects; all straight lines on which the objects lie are arranged in parallel; and the groups have a regular sequence in a direction orthogonal to the straight line.

8. The laminate of claim 1 , wherein all objects have identical shape and size.

9. The laminate of claim 1 , wherein a length of the incisions is in a range from 1 mm to 40 mm.

10. The laminate of claim 1 , wherein a minimum distance between two objects is in a range from 0.1 mm to 15 mm.

11. The laminate of claim 1 , wherein the metal foil comprises aluminum.

12. The laminate of claim 1 , wherein the metal foil has a thickness of 3 μm to 250 μm (micrometers).

13. The laminate of claim 1 , wherein the substrate b) comprises a one- or more-layered fiber material comprising one- or two-layer non-woven fabrics.

14. The laminate of claim 1 , wherein the substrate b) has a thickness from 50 μm to 1500 μm.

15. The laminate of claim 1 , wherein the laminate has a tear propagation strength, determined in accordance with DIN EN ISO 9073-4:1997-07, in a range of 1 to 100 N.

16. An electromagnetically shielded component, comprising:
at least one laminate of claim 1 .

17. A method for producing a component shielded against electromagnetic radiation, the method comprising:
i.1) providing the laminate of claim 1 and at least one polymer material (c) or a precursor thereof; and
ii.1) subjecting the laminate and the polymer material (c) or the precursor thereof to forming while bonding the materials, and thereby, if present, bringing the precursor to polymerization,
or

i.2) providing the laminate of claim 1 and at least one component; and
ii.2) partially or completely coating or sheathing the component with the laminate.

18. The method of claim 17 , wherein the polymer component of the polymer material (c) is selected from a group consisting of: 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, polyvinylchlorides, polyphenylene ethers, polystyrenes, polyamides, polyolefins, polketones, polyetherketones, polyimides, polyetherimides, polyethylene terephthalates, polybutylene terephthalates, fluoropolymers, polyesters, polyacetals, liquid crystal polymers, polyethersulfones, epoxy resins, phenole resins, chlorosulfonates, polybutadienes, polybutyls, polyneoprenes, polynitriles, polyisoprenes, natural rubbers, styrene isoprene styrenes, styrene butadiene styrenes, ethylene propylenes, ethylene propylene diene rubbers, styrene butadiene rubbers, and their copolymers and mixtures thereof.

19. The method of claim 17 , wherein, in step i.1), the polymer material (c) is provided in a form of a composite material comprising the polymer component of the polymer material (c) and at least one further component (K).

20. The method of claim 17 , wherein, in step i.1), the polymer material (c) is provided in a form of a composite material comprising at least one fibrous reinforcing material.

21. The method of claim 17 , wherein, in step i.1), the polymer material (c) is provided in a form of a composite material comprising a fibrous reinforcing material embedded in a thermoplastic material matrix.

22. The method of claim 17 , wherein the method is used for shielding against electromagnetic radiation, power-conducting systems and power stores.

23. The method of claim 22 , wherein the method is used for shielding against electromagnetic radiation in fields of power electronics, a battery, an electric motor, and for shielding navigation and communication equipment.

Assignees

• Freudenberg Carl Kg

Inventors

• Schneider Ulrich
• Senne Sarah
• Zaplatilek Michael

Classifications

• H05K9/0084 Primary

  comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition · CPC title

• H01Q17/008

  with a particular shape (H01Q17/007 takes precedence) · CPC title

• H05K9/009

  comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked · CPC title

• H05K9/0086 Primary

  comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering · CPC title

• H05K9/0088 Primary

  comprising a plurality of shielding layers; combining different shielding material structure · CPC title