DE2361207A1 - Telecommunication cable with plastic insulated conductors - has sealing filler against longitudinal water penetration - Google Patents

Abstract

The telecommunication cable with plastic insulated conductors has a filler for longitudinal sealing of the cable against water penetration. The filler may be non-polar, foamed-up and reticulate bonded by a high frequency process such as by passage through a UHF cavity resonator. The filler can be applied to the individual conductor before twisting or in the case of a cable with multiple twisting stages can be applied before the consecutive twisting process on to the twisted element. Due to the reticulate bonding favourable elastic properties are obtained and by the foaming-up of the filler the dielectric constant is reduced which results in an improvement of the overall transmission properties of the cable.

Description

AEG-TELEFUITKEN Kabelwerke Aktiengesellschaft, Rheydt 4-330 Mülheim (Ruhr) - Saarn Sommerfeld 22 - 28

Eanilton / ka * BI 73/53

November 29, 1973. . ·. "

H. ~: s rs ~ o if it isolates telecommunication cables

I / he connection concerns a plastic-insulated Perndek-tbel nlt a filler for longitudinal sealing against stinging water.

known to make plastic-insulated telecommunication cables longitudinally watertight that the. Interstices between the stranding elements during the manufacture of the cables are filled with ophthalmic aterialien, eggs for waxy substances such as petrojelly or foamed materials such as polyurethane are discarded. For connection cables (local cables) operated exclusively at low frequencies, both fillers have proven themselves in principle, as long as they are cables with a relatively small number of pairs, e.g. 3. Up to 200 pairs with 0.4 mm conductors are traded.

In terms of transmission technology, however, this applies to petrojelly-filled ones Cable during the transition to higher frequencies, e.g. pulse code module Ia ~ s2.or., Difficulties due to the higher dielectric number of the filling material, the long-term interaction with the Core insulation, especially with cellular polyethylene insulation · » ur.i w. «rcn the partly inhomogeneous distribution of the filler.

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.-. but it is also used for cables with large diameters, e.g. up to 2,000 pairs with 0.4 mm conductors with a homogeneous one Filling as it is technically necessary for the installation Flexibility severely impaired.

Purely polyurethane-filled cables fail the one previously used Process engineering in which the foaming pressure releases the filler during the sheathing of the cable from the outside in all free areas Penetrates gaps. This also applies to cables Diameter:! larger than 20 mm to 30 mm. In addition, the } Iabel is essentially too stiff. "

The vibertragunEStechnischen and the laying-related defects the PetrowelIy- and polyurethane-filled cables can be now by 'avoiding' that according to the invention as a filler non-polar, foamed and cross-linked material is provided. Such a material is expediently a hydrocarbon. This is caused by foaming and Crosslinking is set so that it does not affect the electrical and mechanical properties of the cable Limitation with regard to the transferability and the number of pairs occurs.

The crosslinking achieves favorable elastic properties of the filler, through the foaming the dielectric, The number of margins is reduced and with it the influence on the "Transmission properties improved. Appropriately, networking and foaming by high frequency, e.g. 3. in a continuous process, through a UHF waveguide with microwaves achieved. The high-frequency crosslinking is made possible by adding crosslinking agents and blowing agents to the non-polar filler to be admitted · 'that have a sufficiently polar;

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result in the entire filler, so that the necessary marine warmth is generated by the high frequency. Even if the filler briefly reaches temperatures of around 150 ° C or more, the PE or cell-PE-insulated telecommunication wires are not affected because the non-polar material is practically not heated by the high frequency <5hz, as the heat generated proportional tL ^a -C-co-tanS , 1st.- · ^; '■ - -.'- ■■ ■'^;

As the crosslinking agent, for example dicumyl peroxide can / v ground used as a blowing agent for foaming z can. B ". Disulzciiydrazide, which are known under the trade name Porofor, are mixed in. The high-frequency crosslinking can also be increased by adding .other polar substances, such as ethylene vinyl acetates.

During production, the filler is applied to the cable cores before stranding. Are several turns not- -'-. '. agile, the application takes place on the stranding element before the subsequent stranding process. '

3 pages description
5 claims

5 098 2 A / 0500.

BATH ORIGINAL

Claims (2)

AEG-TELEFUITKEN 'Kabelwerke -'. . Aktiengesellschaft, Hheydt -. ·,. 4330 Muelheim (Ruhr) - Saarn 'Sommerfeld 22 - 28' .. '■■''- - _·;.; ... Haxilton / ka. · V ₁ ; , ·. BI 73/53 29. liov. 1973: '' · ■ "· - .. · ■ '■■': '■ [■ Claims Plastic-insulated telecommunication cable with a filler for longitudinal sealing against penetrating water, thereby - that the filler is a non-polar, aufgesciiätdtes xmd networked material 'is provided. 2 .. telecommunication cable according to claim 1, characterized in that O' that a hydrocarbon is provided as filler. 3 telecommunication cable according to claim 1 and 2, characterized in that that the filler is foamed and crosslinked by high frequency. 4- · telecommunications cable according to claim 3, characterized in, "da3 of the filler prior to the stranding of the cable wires _^i:: \ is applied · - I. '.' 5 telecommunication cable according to claim 3, characterized in that that the filler is applied to the stranding element prior to the subsequent twisting turn in the case of several stranding turns. is brought. · · '. ··' '; - 509824/0500