Cable And Method For Production Of A Cable

Abstract

A cable has an electrically conductive core (4) made of one or more individual conductors and having an insulation surrounding the core (4). The insulation is made from a silicone material. The insulation has at least two separate silicone layers (1, 2). The two layers are formed from different silicone material. The first silicone layer (1) surrounds the core (4). The first silicone layer (1) is designed as an insulation inner layer made from a non-pressurized peroxide-crosslinked silicone material. The second silicone layer is applied to the insulation inner layer. It is an insulation outer layer and is formed from an addition-crosslinked silicone material.

Claims

1-8. (canceled)

9. A cable comprising an electrically conductive core made of one or more individual conductors; an insulation surrounding the core, the insulation made from a silicone material, the insulation further comprises: at least two separate silicone layers that include different silicone material, the first silicone layer surrounding the core is designed as an insulation inner layer made from a non-pressurized peroxide-crosslinked silicone material, and the second silicone layer is applied to the insulation inner layer as an insulation outer layer and is formed from an addition-crosslinked silicone material.

10. The cable according to claim 9, wherein the insulation inner layer, used as basic insulation, has a thickness of 0.2 to 1.8 mm, and the outer insulation outer layer, used as a cover layer, has a small thickness of 0.05 to 0.5 mm.

11. The cable according to claim 9, wherein the insulation outer layer includes an addition-crosslinked fluorosilicone material.

12. The cable according claim 9, further comprising a separation layer, the separation layer is arranged between the core and the insulation inner layer, the separation layer includes an addition-crosslinked silicone material and the separation layer has a thickness of 0.05 to 0.5 mm.

13. The cable according to claim 9, further comprising color pigments introduced only into the insulation outer layer.

14. A method for production of a cable, where the electrically conductive core is provided with an insulation made of crosslinkable silicone materials, on the core, comprising: applying a first insulation inner layer made of a first mixture onto the core, the mixture includes a non-pressurized peroxide-crosslinkable silicone material; applying an insulation outer layer made of a second mixture to the first insulation inner layer, the second mixtures includes an addition-crosslinkable silicone material; and heating the two layers to crosslink the two layers together in a heating device.

15. The method according to claim 14, wherein the two different insulation layers are applied onto the core in a two-layer extruder.

16. The method according to claim 14, wherein prior to the application of the two insulation layers, applying a separation layer onto the core, the separation layer, is applied as a third mixture, the third mixture including an addition-crosslinkable silicone material, and the separation layer is crosslinked together with the two subsequently applied insulation layers.

Description

DRAWINGS

[0029] Embodiment examples of the disclosure are described below in reference to the drawings. The disclosure is not limited to these embodiment examples. The drawings, in reference to figures, shows the basic design of the present, namely:

[0030] FIG. 1 is a cross section through a first embodiment of a cable.

[0031] FIG. 2 is a cross section through an additional embodiment of a cable with a separation layer.

DETAILED DESCRIPTION

[0032] FIG. 1 shows a cross section through an cable including an electrically conductive core 4. In this case, the conductive core is made of multiple individual conductors. This core 4 is surrounded by insulation, namely by an insulation inner layer 1 and an insulation outer layer 2. The insulation inner layer 1 includes a non-pressurized peroxide-crosslinked silicone material and ensures basic insulation. This basic insulation here represents a thick layer that ensures the essential insulation properties. They are the electrical insulation, the filling in of irregularities as well as the mechanical protection of the wires of the core 4. The thickness of such an insulation inner layer 1 is preferably 0.2 to 1.5 mm.

[0033] The outer thin insulation layer 2 is used as a cover layer. It has a thickness of only 0.05 to 0.5 mm. It includes an addition-crosslinked silicone material. This thin insulation outer layer 2 prevents the deposition of byproducts of the crosslinking of the insulation inner layer 1 on the cable surface. Thus, a sticking together of the cable layers during the winding of the cable onto cable spools does not occur.

[0034] In FIG. 2, another embodiment of a cable is shown. In this cable, a separation layer 3 is additionally provided. The separation layer 3 is applied directly to the core 4 and separates the core 4 from the insulation inner layer 1. This separation layer 3 includes an addition-crosslinked silicone material and, like the insulation outer layer 2, it likewise has a small thickness of preferably 0.05 to 0.5 mm. In particular, as materials for the separation layer, such addition-crosslinked silicone materials are used, the monomer content of which has been reduced beforehand by special purification, so that they exhibit reduced fogging properties. The crosslinking of such a silicone material can occur either thermally under non-pressurized conditions or in less time by UV light.

[0035] The present disclosure has been described with reference to the preferred embodiment. Obviously, modifications and alternations will occur to those of ordinary skill in the art upon reading and understanding the preceding detailed description. It is intended that the present disclosure be construed to include all such alternations and modifications insofar as they come within the scope of the appended claims or their equivalents.