DE3132058A1 - Self-supporting optical communication cable - Google Patents

Abstract

The invention relates to an optical communication cable having a plurality of optical fibres, which are stranded about a bundle of plastic threads and around which are wound one or more layers of strips of plastic which can slide effectively, and having a fibre-reinforced cladding which is applied to the core with a spacing. The object is to specify an optical communication cable for substantially increased span length. The solution consists essentially in filling the spacing between the core and cladding with a non-hardening plastic, and in configuring the cladding predominantly from reinforcing fibres which are connected to one another by a plastic. The invention is applied chiefly as a self-supporting aerial cable. <IMAGE>

Description

Self-supporting optical communication cable

The invention relates to an optical communication cable, with several, around a bundle of plastic threads stranded fiber optic letters, which with a or several layers of tape made of easy-sliding plastic are wrapped, and with a fiber-reinforced sheath applied to the core at a distance.

Optical cables of the type described are particularly suitable for Use as a self-supporting aerial cable.

An optical communication cable with optical fibers is already known containing core and a fiber-reinforced plastic jacket, in which the optical fibers short lay with a bundle of short lay plastic threads are stranded, in which the rope consisting of optical fibers and threads with a or several layers of tape made of easy-sliding plastic is wrapped in around the core of the fiber-reinforced, consisting of optical fibers, threads and ribbons Plastic jacket is applied with a spacing that is 5 to 50 ffi of the diameter of the soul, and in the case of the plastic jacket with a long blow at least a layer of high-strength reinforcing fibers is incorporated (DE-GM 80 16 766).

With an optical cable according to this state of the art, I leave Bridge spans of up to around 250 m. Based on this, the invention is the The task is based on specifying an optical cable, the structure of which bridges the gap larger tension bets allowed.

This object is achieved according to the invention in that the spacing space between the core and the jacket is filled with a soft plastic, and that the man 1 consists mainly of reinforcing fibers, which are through a plastic are connected to each other.

The advantages that can be achieved with the invention consist essentially in that in this way a much better relationship between allowable Tensile force and the weight of the cable, so a greater tear length can be achieved can.

In one embodiment of the invention, the fibers of the jacket are glass fibers.

With professional handling of commercially available continuous glass fibers This material selection offers a particularly favorable compromise between the material costs on the one hand and the tensile strength and service life of the cable on the other.

In a further embodiment of the invention, which is the fibers of the Plastic polyester connecting the jacket.

The use of this plastic has the advantage that it is relatively Even small amounts ensure a good and tight connection between the glass fibers results, so that little weight is used to connect the fibers got to.

In another embodiment of the invention, that is the space between Plastic silicone gel fills the core and jacket.

With this embodiment of the invention, an excellent Achieve the service life of the cable even with bending and vibration loads.

In a further embodiment, the plastic is an intermediate core and sheath polyvinylidene fluoride.

This provides a good protection of the cable against shear forces, impact and Kick loads achieved.

In a preferred embodiment of the invention, the spacing space is between the core and the jacket with a layer of silicone gel and one on top Polyvinylidene fluoride tube filled.

This combination offers the best possible protection against all occurring Types of stresses and results in a cable with a very long service life.

In a further embodiment of the invention, the IYa1) tel; of the cable arranged an outer sheath. It is preferably made of polyprevpylene.

This configuration offers additional protection for the cable against Weather conditions and against the ingress of moisture An exemplary embodiment the invention is shown in the drawing and is described in more detail below, The single figure shows an implemented cable in a schematic representation in cross section. In the example, two light guides are included, which are labeled 1. Your plastic casing, which is drawn as a solid shell in the example is denoted by la. She ; -ind together with two plastic snaffles 3 around a bundle 2 Plastic fibers stranded. A long pitch with one pitch length is preferred here of about 75 mm. The resulting rope 5 is wrapped with a film 4, which consists of a plastic that slides well.

In the example, a layer G made of silicone gel is arranged above this, which is surrounded by a hose 7, which is preferably made of polyvinylidene fluoride consists. In the example, there is a separating film above to make production easier 8 arranged. The tensile strength jacket 9 arranged above it consists predominantly of reinforcing fibers 10, which are preferably made of glass fibers.

They are connected to one another with a plastic 11, which is preferably is a polyester. An outer jacket 12 is also arranged over the tensile jacket 9, which preferably consists of polypropylene and only a few with this choice of material Tenth of a millimeter thick needs to be good protection from the elements to offer. The space between the cable core 5 and the tensile sheath 9 is with marked with the reference character A. Spanning field lengths can be achieved with a cable of this type reach up to 500 m.

Claims (8)

Claims: 1. Optical communication cable, with several, around a bundle (2) of plastic threads stranded optical waveguides (1, la) with one or several layers of tapes (4) made of easy-sliding plastic are wrapped, and with a fiber-reinforced sheath applied to the core (5) at a distance (A) (9), d a d u r c h e k e n n z e 1 c h -n e t that the space (A) between Core (5) and jacket (9) is filled with a soft plastic (6, 7), and that the jacket (9) consists predominantly of reinforcing fibers (10), which through a plastic (11) are connected to one another. 2. Cable according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the fibers (io) of the jacket (9) are glass fibers. ). Cable according to Claim 1 or 2, d u r c h g e k e n n -z e 1 c h n e t that the plastic (11) connecting the fibers (10) of the jacket (9) is polyester is 4. Cable according to one of claims 1 to 5, d a d u r c h gek e n n z e i ne t that the plastic (6) between the core (5) and jacket (9) is silicone gel. 5. Cable according to one of claims 1 to 3, a d a d u r c h gek e n n z e i c h ne t that the plastic (7) between the core (5) and jacket (9) is polyvinylidene fluoride is. 6. Cable according to one of claims 1 to 5, d a d u r c h g e k e n n z e i c h n e t that the space (A) between the core (5) and the jacket (9) with a layer (6) made of silicone gel and an overlying tube (7) made of polyvinylidene fluoride is filled. 7. Cable according to one of claims 1 to C, d a d u r c h g e k e n n z e i c hn e t that an outer jacket (12) is arranged above the jacket (9). 8. Cable according to claim 7, d a d u r c h g e k e n n -z ei c h n e t that the outer jacket (12) consists of polypropylene.