Cable and method for the production thereof

Abstract

A cable having an electrical conductor, a silicone sheath surrounding the conductor, and a separation layer between the conductor and the silicone sheath. Said cable is characterized in that the separation layer is made of a silicone material that is less adhesive to the conductor than the material of the silicone sheath. The invention further relates to a method for manufacturing a cable of said type.

Claims

1. A cable comprising: an electrical conductor; a silicone sheath surrounding the conductor; and a separation layer arranged between the conductor and the silicone sheath, the separation layer being made of a silicone material that has a lower adhesion to the conductor than a material of the silicone sheath, wherein at least one filler is added to the silicone material for the lower adhesion of the separation layer as compared with the silicone sheath, wherein either silicon dioxide or silicic acid is used as the filler with a proportion in the silicone material being in a range from 30 percent by weight to a maximum of 60 percent by weight, and wherein an identical heat curing silicone based on diorgano(poly)siloxanes is used for the silicone material and for the silicone sheath so that the silicone sheath and the separation layer differ only by the filler, and wherein the separation layer directly contacts the conductor and the silicone sheath forms the outermost layer of the cable.

2. The cable according to claim 1, wherein the separation layer is integrally joined to the silicone sheath.

3. The cable according to claim 1, wherein the silicone material has a higher density than the silicone sheath.

4. The cable according to claim 1, wherein the silicone material has a density in a range from approximately 1.5-1.8 g/cm.sup.3.

5. The cable according to claim 1, wherein the conductor is made of aluminum or an aluminum alloy.

6. The cable according to claim 1, wherein the conductor is a stranded conductor.

7. The cable according to claim 1, wherein silicic acid is used as the filler, the silicic acid being pyrogenic silicic acid.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawing which is given by way of illustration only, and thus, is not limitive of the present invention, and wherein the sole FIGURE illustrates an example embodiment, showing a cable in cross section.

DETAILED DESCRIPTION

(2) In the exemplary embodiment shown, a conductor 4, in particular a central conductor, is implemented in the cable 2 as a stranded conductor or wire rope and comprises a plurality of individual wires 6, which preferably are all made of aluminum or an aluminum alloy. They are enclosed by a non-adhering separation layer 8 made of a silicone material, which in this case is a silicone with added filler 9. Provided in particular as filler 9 is a pyrogenic silicic acid. Finally, the separation layer 8 is enclosed by a silicone sheath 10. Here, the latter has a significantly greater wall thickness in the radial direction than the separation layer 8. In the cable, the separation layer 8 and the silicone sheath 10 as inner or outer silicone sheath, respectively, form a combined silicone sheath 10 of the cable 2.

(3) The filler 9 used in the exemplary embodiment is a so-called pyrogenic silicic acid, which has a density of approximately 2.2 g/cm.sup.3, for example. In general, the proportion of filler 9 in the silicone material is in the range between 20 and 70%, in particular in the range between 30 and 60 percent by weight.

(4) The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.