Optical waveguides – Optical transmission cable – Loose tube type
Reexamination Certificate
1999-06-16
2001-01-23
Healy, Brian (Department: 2874)
Optical waveguides
Optical transmission cable
Loose tube type
C385S100000, C385S111000, C385S113000, C385S141000
Reexamination Certificate
active
06178277
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a multi-layer reinforced and stabilized cable construction comprising a core portion and a non-metallic sheathing portion with barrier and protective layers and two or more reinforcement layers.
BACKGROUND
Cable constructions of the above-mentioned type are rather well known at present in connection with various cables, e.g. optical cables. The existing non-metallic optical cable constructions require several process steps, some of which may be very slow. Expensive reinforcements added separately to the constructions may require the use of additives in order that better grip or waterproofness could be obtained, which further retards the manufacturing process. In order to improve the thermal stability of the cable construction, i.e. to reduce the thermal compression, it is often also necessary to use rod-like reinforcement elements. The use of such elements results in certain, not always positive, properties of the cable: flexural stiffness, greater dimensions, high price, etc. It is particularly difficult to use such separate composite rods in so-called center pipe constructions, in which the rods must be mounted on the outer circumference of the core, and there must be at least two of them for reasons of symmetry.
If the cable is to provide mechanical protection against rodents and termites and resistance to oil and chemicals, and/or to have barrier properties against moisture and gases, it is necessary to use expensive semi-finished products, which must be processed in separate, often complicated process steps. This complicates the construction and increases the costs of the product.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a cable construction by which the above-mentioned drawbacks of the prior art can be eliminated. This is achieved with the cable construction of the invention. The cable construction of the invention is characterized in that, in order for the mechanical and barrier properties of the cable to be controlled, the barrier and protective layers and/or the reinforcement layers are oriented in a controlled manner at different angles by means of fibrous reinforcements or lamellar barriers.
An advantage of the invention over the prior art is, for example, that the mechanical and barrier properties of the cable can be adjusted extremely advantageously according to the need. This is because the invention is simple, and the manufacture can take place in one extrusion step, whereby the costs will be low. A further advantage of the invention is that it makes it possible to provide a construction which can be re-melted and is completely recyclable.
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Derwent's Abstract of SU 1,384,394 of Mar., 1988.
Heino Markku
J{umlaut over (a)}rvenkyl{umlaut over (a)} Jyri
Kirjavainen Kari
Ravela Jussi
Suvanto Markku T.
Healy Brian
Ladas and Parry
NK Cables OY
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