DE1038628B - Tape-shaped element for the production of winding layers in electrical cables - Google Patents

Description

For the construction of electrical cables, band-shaped elements are often made of a dimensionally stable, but Cold-deformable material, such as foils made of metal, is used, which has insufficient longitudinal extensibility to form wrinkle-free, smooth winding layers. When spinning such ribbons, it prepares Difficulty applying this to the part of the cable to be wrapped without creasing and without forming a bag. The risk of wrinkles and bags forming is particularly great when the tapes are in a known position Way to form cavities are provided with projections and are spun on overlapping should. If the ribbons are also corrugated in a known manner, there is a risk of stretching of the tapes as a result of the tensile stresses that occur during spinning or winding. According to known Proposals should, for example, corrugated or protruding metal foils around the cable core of oil cables are wound around an oil channel to form between the cable core and the cable sheath. According to another related known Suggestion should be wrapped around the cable core of an oil or gas pressure cable a tape that provided in one edge area with dome-like projections distributed at points and in the other Edge area is made smooth. This tape is, with the interposition of a semiconducting, for oil and Gas-permeable tape wrapped around the cable core. But there is also this version during wrapping there is a risk of uneven deformation of the tape and bag formation, especially if you want to increase the production speed as large as possible Applies helix angle. It has also become known for cables with a warm pressed-on aluminum jacket, the cable core against inadmissible heating when applying the aluminum jacket by means of the metal foils provided with corrugated or punctiform or dome-shaped projections protection. Next, tapes with indented protrusions made of dimensionally stable and plastically warm Deformable insulating materials, such as polystyrene, are known to form air-containing insulating layers in high-frequency cables to build.

According to the invention, in a for the production of smoothly fitting winding layers in Electric cables used a band-shaped element made of a dimensionally stable, but cold or hot deformable Material that is only in a certain area with preferably card-shaped projections is provided, one or both edge zones through additional deformation with greater extensibility executed. The edge zones are advantageously

Band-shaped element

for the production of winding layers

in electrical cables

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Ing. Walter Jaeschke, Berlin-Steglitz, and Erich Röscher, Berlin-Siemensstadt,

have been named as inventors

Provided with longitudinal waves for greater elasticity.

A preferred embodiment for the production of overlapped tape windings is an edge zone of the tape to wave, on the other hand to keep the other smooth, so that in the finished winding the corrugated edge zone overlaps the smooth one. The formed waves expediently run at an angle to the In the longitudinal direction of the tape, the wave peaks and valleys are parallel or run approximately parallel to the cable axis. Belt-shaped ones made of metal are particularly advantageous Elements according to the invention for heat protection windings over the cable core electrical Cables can be used in which a cable sheath made of metal, in particular aluminum, is applied will.

The invention is described below with reference to the exemplary embodiments shown in the drawing explained in more detail.

1 shows a film 10 into which the card-shaped projections 11 are formed in the central region are. While the film is left smooth in the area 12 of one edge zone, the film is in the Provide the area of the other edge zone with the indented waves 13.

2 shows the use of a metal foil designed according to the invention as a heat protection layer shown for a telecommunication cable with an aluminum jacket. It's 14 'including the cable core

809 637 361

usual psychological positions. The insulation of the cores of such a cable generally consists made of dry paper, but can also be made of a thermoplastic material, e.g. B. foam from Polystyrene, polyethylene or the like. Are made. There is now an aluminum core around the cable core Foil 10 'wrapped with an overlap in such a way that the corrugated edge zone 13' the smooth edge zone 12 'of the previous turn overlaps. As can be seen, the waves in the edge zone 13 'run obliquely to Direction of the tape so that the wave crests and valleys of the foil are parallel to the cable axis when rolled up get lost. This ensures that the waves do not spread apart during the winding process. Tests have also shown that when the film is rolled up, there are no creases and no bags form. The aluminum jacket 15 is pressed on directly over the metal foil winding. The dome-shaped Projections 11 'ensure that there is a cavity between the foil winding and the aluminum jacket arises and that the heat radiated from the hot aluminum during the pressing process from the bare aluminum foil surface is highly reflected.

The specified embodiment can also be modified in such a way that, for example, both Edge zones can be designed with increased extensibility. It is also possible to have several ribbon-shaped To wrap elements according to the invention on top of each other.

Claims (5)

Patent claims: 1. Band-shaped element made of a dimensionally stable, but cold or hot deformable material that only in a certain range of the bandwidth with preferably card-shaped projections is provided for the production of smoothly fitting winding layers in electrical cables, characterized in that one or both edge zones of the tape by additional deformation are designed with increased extensibility. 2. Band-shaped element according to claim 1, characterized in that the edge zones are enlarged Extensibility are provided with longitudinally extending waves (13, 13 '). 3. Tape-shaped element according to claim 2 for overlapped windings, characterized in that that one edge zone is corrugated and the other is smooth, so that in the finished winding the corrugated edge zone overlaps the smooth edge zone. 4. Band-shaped element according to claim 2 or 3, characterized in that the waves are formed so obliquely to the tape direction that the wave crests and valleys in the spun State of the tape run parallel or approximately parallel to the cable axis. 5. Application of the band-shaped element according to claim 1 and in particular according to the claims 3 and 4, made from a bare sheet of metal, preferably aluminum, for a heat protection tape winding over the cable core of an electrical cable with an underneath Cable jacket made of metal, in particular aluminum, applied at a higher temperature. Considered publications:
German Patent Nos. 529 233, 572 464;
U.S. Patent No. 2,591,794. 1 sheet of drawings I «09 637/361 9.58