Method of and apparatus for producing an optical multi-fibre cab

Details Method of and apparatus for producing an optical multi-fibre cab Method of and apparatus for producing an optical multi-fibre cab

1990-10-16

1992-04-07

Lindsay, Robert L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

57 7, 57297, 65 311, 65 42, 65 421, 264174, B29D 1100

Patent

active

051025841

ABSTRACT:
A method of producing an optical multi-fibre cable element provided with a secondary sheathing by extruding (1) a loose secondary sheathing (10) around a fibre bundle (9) and providing the fibres with a desired extra length with respect to the secondary sheathing. To avoid variation in fibre length in the production of cable elements the secondary sheathing (10) together with the fibre bundle (9) is twisted (12) around its axis after the extrusion step (1) at least to such an extent that the longitudinal sliding of the fibres with respect to each other is prevented in the twisted fibre bundle and that the stretching of the fibres in the fibre bundle at the step of providing the extra length (3; 18) is kept within the elastic range of the fibres. In an apparatus suitable for realizing the method, twisting means (7) are provided after the extruder and before the device providing the extra length, which twisting means twist the secondary sheathing and the fibre bundle in such way that the fibres are locked together.

REFERENCES:
patent: 4205899 (1980-06-01), King et al.
patent: 4446686 (1984-05-01), Panuska et al.
patent: 4458476 (1984-07-01), Mayr et al.
patent: 4772435 (1988-09-01), Schlaeppi et al.

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