Method for producing a dry film, rolling device

Patent metadata

Field	Value
Publication number	US-11990599-B2
Application number	US-201816613138-A
Country	US
Kind code	B2
Filing date	May 14, 2018
Priority date	May 16, 2017
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

The invention relates to a method for producing a dry film (3), wherein a dry powder mixture is processed into the dry film (3) by a rolling device comprising a first roller (2a) and a second roller (2b). The first roller (2a) has a higher circumferential rotational speed than the second roller (2b), and the dry film (3) is placed on the first roller (2a).

First claim

The invention claimed is:

1. A method for producing a dry film, in which
a dry powder mixture is processed into the dry film by a rolling device having a first roll and a second roll, wherein
the first roll has a higher rotational peripheral speed than the second roll and the dry film is supported on the first roll,
wherein a ratio of the rotational peripheral speed of the first roll to the rotational peripheral speed of the second roll of 10:5 to 10:1 is maintained, and
wherein the dry powder mixture contains polytetrafluoroethylene.

2. The method as claimed in claim 1 , wherein the rolling device is a calendar rolling device.

3. The method as claimed in claim 1 , wherein for the production of the dry film, the dry powder mixture is a non-flowable dry powder mixture.

4. The method as claimed in claim 1 , wherein the first roll is provided with an adhesion-enhancing modification, and/or the second roll is provided with an adhesion-reducing modification.

5. The method as claimed claim 1 , wherein the dry film is applied to a substrate, wherein the substrate, for the application, is moved at a speed equal to the rotational peripheral speed of the first roll.

6. The method as claimed in claim 5 , wherein the substrate is moved over the first roll while the dry film is formed on the substrate.

7. The method as claimed in claim 1 , wherein the dry film is formed by the first roll and the second roll with a linear force, acting in the nip between the rolls, of 100 N/cm to 10 kN/cm.

8. The method as claimed in claim 5 , wherein the substrate consisting of a metallic material is used.

9. The method as claimed in claim 5 , wherein prior to the lamination of the dry film on the substrate, the substrate is provided with a thermoplastic primer.

10. The method as claimed in claim 5 , wherein the substrate consisting of an expanded metal, a metal wire mesh, a nonwoven fabric, a copper foil or an aluminum foil with an applied carbon primer is used.

11. The method as claimed in claim 1 , wherein the dry film is formed with a thickness less than 500 μm.

12. The method as claimed in claim 1 , wherein the dry powder mixture, contains a conductive additive, porous carbon, a transition-metal oxide and/or sulfur.

13. The method as claimed in claim 1 , wherein by shearing in a nip, the dry film is formed which has fibrils formed anisotropically in the rotational direction of the first and second rolls.

14. The method as claimed in claim 1 , wherein a formation of a structuring of the dry film in strip form, or in rectangle form in the rotational direction of the second roll is achieved by coating an adhesion-enhancing primer layer on respective substrate surface regions.

Assignees

• Fraunhofer Ges Forschung
• Univ Dresden Tech

Inventors

• Althues Holger
• Tschoecke Sebastian
• Schumm Benjamin
• Kaskel Stefan
• Girsule Christian
• Jordan Daniel
• Schoenherr Kay

Classifications

• B29C43/222

  characterised by the shape of the surface · CPC title

• B29C43/32

  Component parts, details or accessories; Auxiliary operations · CPC title

• B29C43/24 Primary

  Calendering · CPC title

• B29C43/58 Primary

  Measuring, controlling or regulating {(for bank adjustment in calendering B29C43/245)} · CPC title

• H01M4/0435 Primary

  Rolling or calendering · CPC title