Semi-finished product made from composite material, comprising a flexible electromagnetic shielding film

Patent metadata

Field	Value
Publication number	US-10194568-B2
Application number	US-201415108805-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 30, 2013
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Semi-finished product made from composite material comprising a thermoplastic or thermosetting matrix and reinforcement fillers. The semi-finished product comprises an electromagnetic shielding film positioned in the thickness of the semi-finished product, the electromagnetic shielding film comprising holes.

First claim

The invention claimed is:

1. A semi-finished product made from a composite material including a thermoplastic or thermosetting matrix and reinforcement fillers, the semi-finished product comprising:
a plurality of strips of an electromagnetic shielding film in a thickness of the semi-finished product, the electromagnetic shielding film including holes;
wherein the plurality of strips have a non-zero overlap; and
wherein the electromagnetic shielding film is not flat.

2. The semi-finished product according to claim 1 , wherein a total area of the holes is less than an area of a material forming the electromagnetic shielding film.

3. The semi-finished product according to claim 1 , wherein the electromagnetic shielding film is perforated at regular intervals.

4. Semi-finished product according to claim 1 , wherein the electromagnetic shielding film is a flexible metal film, or a metallised film.

5. Semi-finished product according to claim 1 , wherein the electromagnetic shielding film is an aluminium film.

6. Semi-finished product according to claim 1 , wherein the electromagnetic shielding film is positioned on a surface of the semi-finished product.

7. Semi-finished product according to claim 1 , wherein the semi-finished product consists of a sheet, and the electromagnetic shielding film is embedded in the thickness of the sheet.

8. Semi-finished product according to claim 1 , wherein the electromagnetic shielding film is inserted between two sheets of composite material, forming a flexible core.

9. A semi-finished product made from a composite material including a thermoplastic or thermosetting matrix and reinforcement fillers, the semi-finished product comprising:
a plurality of strips of an electromagnetic shielding film in a thickness of the semi-finished product, the electromagnetic shielding film including holes; and
at least one layer having two electromagnetic shielding films separated by an electrically insulating medium;
wherein the plurality of strips have a non-zero overlap.

10. The semi-finished product according to claim 1 , wherein the strips are coated with resin and/or a product chemically compatible with a resin of the thermoplastic or thermosetting matrix.

11. A box accommodating onboard equipment for storage and/or transmission of electric power and configured to drive a motor vehicle, the box describing a surface substantially entirely enclosing a housing for receiving the onboard equipment,
wherein the box is made with the semi-finished product according to claim 1 .

12. A method for manufacturing a part by moulding, wherein the plurality of strips of the semi-finished product according to claim 1 are arranged so that after moulding, an entire part in a direction normal to a surface of the part is covered with at least one thickness of electromagnetic shielding film.

13. The method according to claim 12 , wherein the part is a box for accommodating onboard equipment for storage and/or transmission of electric power for driving a motor vehicle, and the following steps are performed using a punch-die type mould:
the plurality of strips of the semi-finished product are arranged on one of the mould walls, so that the entire surface of the box is covered by the electromagnetic shielding film after opening the mould;
the mould is closed, and pressure and temperature chosen to enable the thermoplastic or thermosetting matrix to flow and polymerise are applied, so that the matrix provides cohesion by going through the holes of the electromagnetic shielding film; and
the box is removed from the mould.

14. Method according to claim 13 , wherein the entire surface of the box is covered by the electromagnetic shielding film after opening the mould, by discontinuous overlapping strips of the semi-finished product.

15. Method according to claim 14 , wherein the overlap between each strip is at least 30 mm to 40 mm.

16. The semi-finished product of claim 1 , wherein the electromagnetic shielding film has an embossed shape.

Assignees

• Plastic Omnium Cie

Inventors

• Andre Gerald
• Cheron Hugues

Classifications

• B29K2995/0011

  Electromagnetic wave shielding material · CPC title

• B29C70/885 Primary

  with incorporated metallic wires, nets, films or plates (as lost heating elements B29C35/0272, B29C61/0625) · CPC title

• 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

• H05K9/0086

  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

• B29L2031/712

  Containers; Packaging elements or accessories, Packages (closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418) · CPC title