Process for preparation of multifilament optical fibers

Details Process for preparation of multifilament optical fibers Process for preparation of multifilament optical fibers

1986-06-30

1988-03-22

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

264171, 4251315, 4251331, B29D 1100, G02B 600

Patent

active

047327162

ABSTRACT:
A process for the preparation of a multifilament optical fiber having 1,000 to 10,000 islands as optical filaments, which comprises using a composite spinning spinneret for the preparation of an islands-in-a-sea type multifilament fiber, which comprises at least three piled orifice plates including an orifice plate having many island-forming nozzle holes, an orifice plate having a sea-forming nozzle hole and an orifice plate having a filament-gathering nozzle hole, the nozzle hole of the orifice plate arranged just above the lowermost orifice plate having a trumpet-shaped opening extending toward the lower end face thereof and a sea component flow passage being formed between two orifice plates arranged just above the lowermost orifice plate, and supplying a thermoplastic polymer for forming cores of optical filaments from the island-forming nozzle holes and a sea-forming thermoplastic polymer from the sea-forming nozzle hole to effect composite spinning and gathering many filaments in the gathering nozzle hole.

REFERENCES:
patent: 3608148 (1971-09-01), Sluijtero
patent: 3718534 (1973-02-01), Okamoto et al.
patent: 4409154 (1983-10-01), Grenat

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