Method for manufacturing steel wire material for reinforcing optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsTeruyuki Murai, Susumu Yamamoto
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Abstract
A method for manufacturing a steel wire material for reinforcing an optical fiber is proposed. In this method, a steel wire is firstly subjected to a chemical conversion treatment. The wire is then drawn with a reduction of area of 30% or more. As a result, a coating capable of effectively restraining the production of hydrogen is formed on the surface of the wire.
Claims9
In the method of making a steel wire coated with a chemical conversion coating used for reinforcing an optical fiber comprising:
- immersing said steel wire in a solution of a chemical conversion coating compound;
- thereby depositing said chemical conversion coating on said steel wire;
- and
- drawing said coated steel wire to produce a finished coated steel wire product, the improvement, whereby forming a coated steel wire which is less susceptible to reaction with moisture to evolve hydrogen, and is therefore well suited to use as a reinforcement for an optical fiber, which comprises:
- drawing said coated wire an amount sufficient to reduce its area at least about 30%;
- and
- depositing enough chemical conversion coating on said steel wire so that, after said drawing, at least about 13 gms/m.sup.2 of said coating remains on said wire.
A steel wire used for reinforcing an optical fiber sufficiently covered with a chemical conversion coating thereon to substantially prevent the reaction of said steel with moisture;
- said coating comprising at least about 13 gms/m.sup.2 after said coated steel wire has been drawn an amount sufficient to reduce its area at least about 30%.
Dependencies are inferred from the claim text.