Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform
Patent
1993-05-20
1995-02-28
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Optical fiber, waveguide, or preform
264147, 264162, 2642101, 264174, 264DIG47, 4274121, B29C 4706
Patent
active
053934709
ABSTRACT:
A process for manufacturing optical fibers includes extruding a transparent thermoplastic plastic sheet having plurality of transversely shaped and spaced parallel grooves extending in the longitudinal direction of extrusion. The thermoplastic sheet is rolled between polished rollers having upstanding circumferential ribs matching the shape and spacing of the grooves in the thermoplastic sheet. The rollers separate the extruded thermoplastic sheet into a plurality of elongated fibers and polish and cool the separated fibers. A preferred embodiment includes a first extruding die extruding said thermoplastic sheet having an index of refraction and a second extrusion die applying a co-extruded coating of plastic having an index of refraction lower than the index of refraction of the transparent sheet. The ribs of the polished rollers form various channel shapes that may produce optical fibers in both circular and non-circular cross-sectional shapes.
REFERENCES:
patent: 2728950 (1956-01-01), Annesser
patent: 3470285 (1969-09-01), Kim et al.
patent: 3736217 (1973-05-01), Nagno
patent: 4083914 (1978-04-01), Schippers et al.
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