Method for coating and/or partial extrusion-coating of flexible, elongated products

• US 20050008871A1
• Filed: 07/08/2004
• Published: 01/13/2005
• Est. Priority Date: 07/12/2003
• Status: Abandoned Application

• Current Assignee: HEW-Kable/CDT GmbH & Co. KG.
• Original Assignee: HEW-Kable/CDT GmbH & Co. KG.
• Inventors: Sikora, Manfred
• Application Number:
  US10/885,652
• Publication Number:
  US 20050008871A1
• Time in Patent Office: Days
• US Class Current: 428/421
• CPC Class Codes: H01B 13/14 by extrusion extrusion in general B29C48/00
• CPC Class Codes: H01B 3/445 from vinylfluorides or other fluoroethylenic compounds
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31826 Of natural rubber

Abstract

In order to coat and/or partially extrusion-coat flexible, elongated products, such as electrical cables or wires, and also pipes, tubing or hoses, whose surface has a material-conditioned nonstick characteristic, such as polytetrafluoroethylene, the surface of the product is wholly or partially activated (structured) through a plasma treatment and then flowable materials are applied to the activated (structured) surface area under the influence of heat and/or pressure as a coating, with complete or partial coverage, or as a formed part.

Claims

1. A method for coating and/or partial extrusion-coating of flexible, elongated products, whose surface has a material-conditioned nonstick characteristic, the method comprising:

activating at least a portion of the surface of the product by a plasma treatment; and

applying flowable materials to the activated surface area under the influence of heat and/or pressure as a coating, with complete or partial coverage, or as a formed part.

3. The method according to claim 1, wherein, subsequent to the plasma treatment, the activated surface having nonstick characteristics is modified by a component contained in the process gas or purge gas.

4. The method according to claim 3, wherein the activated surface is a boundary layer by which a mechanical joining of the coating or the formed part to the surface of the elongated product is accomplished.

5. The method according to claim 1, wherein a low pressure plasma technique is used for the plasma treatment.

6. The method according to claim 1, wherein the plasma treatment of the nonstick surface of the product is performed continuously or discontinuously, depending on the length of the product.

7. The method according to claim 6 wherein the plasma treatment is performed continuously, and wherein the elongated product passes through a plasma unit having at least one chamber, in which the process gas is introduced and the plasma is generated from the gas.

8. The method according to claim 7, wherein the elongated product is passed through the at least one chamber into which the process gas is introduced, whereby the plasma is generated therefrom, and subsequently the plasma is delivered out of the chamber to the surface of the product.

9. The method according to claim 8, wherein the plasma is completely distributed over a circumference of the elongated product.

10. The method according to claim 6 wherein the plasma treatment is performed discontinuously, and wherein the elongated product is placed in a drum, which rotates during the plasma treatment after introduction of the process gas.

11. The method according to claim 10, wherein short lengths of the product are placed as loose product in the drum and are then subjected to the plasma treatment.

12. The method according to claim 10, wherein the elongated product is placed as a wound ring in the drum and is then subjected to the plasma treatment.

13. The method according to claim 12, wherein the elongated product that is formed as a wound ring rotates within the drum in addition to the rotation of the drum to thereby avoid shadow formation on the surface of the elongated product.

14. The method according to claim 1, wherein the surface material of the elongated product having nonstick characteristics is a fluoropolymer.

15. The method according to claim 1, wherein the surface material of the elongated product having nonstick characteristics is a silicone rubber.

16. The method according to claim 1, wherein the elongated product has a limited length and one or both ends of the elongated product, having the activated surface, are extrusion-coated directly with a formed part made of dissimilar materials.

17. The method according to claim 16, wherein the dissimilar materials include thermoset plastics, elastomers, thermoplastics, or thermoplastic rubbers.

18. The method according to claim 1, wherein a layer enveloping the product is extruded directly onto the activated surface of the elongated product.

19. The method according to claim 18, wherein the enveloping layer is conductive.

20. The method according to claim 1, wherein the method is applied for a prefabrication of electrical cables and wires, pipes, tubing or hoses.

21. The method according to claim 1, wherein the flexible, elongated products include electrical cables, wires, pipes, tubing, or hoses.

2. A method for coating and/or partial extrusion-coating of flexible, elongated products, whose surface has a material-conditioned nonstick characteristic, the method comprising:

activating at least a portion of the surface of the product by a plasma treatment; and

vapor-depositing metallic materials on the activated surface area as a coating, with complete or partial coverage.

22. The method according to claim 2( wherein the flexible, elongated products include electrical cables, wires, pipes, tubing, or hoses.

23. An elongated product comprising:

a surface having a nonstick characteristic that is at least partially activated by a plasma treatment; and

a coating being formed of a flowable material that is applied to at least a portion of the surface of the elongated product by a plasma treatment via heat or pressure.