Process for manufacturing lacquer-coated electric sheet strip, and lacquer-coated electric sheet strip

Patent metadata

Field	Value
Publication number	US-11292028-B2
Application number	US-201816494589-A
Country	US
Kind code	B2
Filing date	Mar 16, 2018
Priority date	Mar 17, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

In a process for producing a lacquer-coated electric sheet strip a first insulation lacquer layer is applied wet across at least one side of an electric sheet strip. Across the wet first insulation lacquer layer a wet second insulation lacquer layer is applied. In a drying oven drying of the first insulation lacquer layer and the second insulation lacquer layer is performed.

First claim

The invention claimed is:

1. A process for producing a lacquer-coated electric sheet strip for a buildup of electric cores, comprising:
wet application of a first insulation lacquer layer across at least one side of an electric sheet strip;
without performing a partial or complete drying of the first insulation lacquer layer, wet application of a second insulation lacquer layer across the wet first insulation lacquer layer by roll application, where the first insulation lacquer layer and the second insulation lacquer layer are different lacquers; and
drying of the first insulation lacquer layer and the second insulation lacquer layer in a drying oven.

2. The process as claimed in claim 1 , wherein the wet application of the first insulation lacquer layer, the wet application of the second insulation lacquer layer and the drying of the first insulation lacquer layer and the second insulation lacquer layer are conducted in a continuous belt run.

3. The process as claimed in claim 2 , wherein a duration between the wet application of the first insulation lacquer layer and the wet application of the second insulation lacquer layer is not more than 20 seconds.

4. The process as claimed in claim 2 , wherein a duration between the wet application of the second insulation lacquer layer and the drying is not more than 20 seconds.

5. The process as claimed in any of claim 2 , wherein a maximum lamination temperature in the drying oven is between 150° C. and 280° C.

6. The process as claimed in claim 1 , wherein the second insulation lacquer layer is a layer that is an adhesive after the drying.

7. The process as claimed in claim 6 , wherein the second insulation lacquer layer is a baking lacquer layer.

8. The process as claimed in claim 1 , wherein a layer hickness of the first insulation lacquer layer after drying is between 1 and 12 micrometers.

9. The process as claimed in claim 1 , wherein a layer thickness of the second insulation lacquer layer after drying is between 1 and 12 micrometers.

10. The process as claimed in claim 1 , wherein a viscosity of the first insulation lacquer layer directly after the wet application of the first insulation lacquer layer is greater than a viscosity of the second insulation lacquer layer directly after the wet application of the second insulation lacquer layer.

11. The process as claimed claim 1 , wherein the wet application of the first insulation lacquer layer is effected by roll application.

12. The process as claimed in claim 1 , wherein the roll application for the wet application of the second insulation lacquer layer includes a roll which rotates in a belt running direction and which has a roll speed higher than a belt speed of the belt.

13. The process as claimed in claim 1 , wherein a degree of coverage of the second insulation lacquer layer is not more than 80% of an area of the electric sheet strip.

14. A process for producing a lacquer-coated electric sheet strip for a buildup of electric cores, comprising:
wet application of a first insulation lacquer layer across at least one side of an electric sheet strip;
wet application of a second insulation lacquer layer across the wet first insulation lacquer layer by roll application, where the first insulation lacquer layer and the second insulation lacquer layer are different lacquers;
drying of the first insulation lacquer layer and the second insulation lacquer layer in a drying oven;
cutting the electric sheet strip so as to obtain a plurality of electric sheets; and
stacking the plurality of electric sheets to form an electric core.

Assignees

• Voestalpine Stahl Gmbh

Inventors

• Fluch Ronald
• Keppert Timothy

Classifications

• B05D5/12 Primary

  to obtain a coating with specific electrical properties · CPC title

• B05D2252/02

  of indefinite length · CPC title

• B05D2401/20

  Aqueous dispersion or solution · CPC title

• B05D2202/10

  based on Fe · CPC title

• C21D8/1283

  Application of a separating or insulating coating · CPC title