Multifilament type plastic optical fiber

Details Multifilament type plastic optical fiber Multifilament type plastic optical fiber

1987-09-22

1988-09-06

Sikes, William L.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

350 9610, 264 15, G02B 604, B29D 1100

Patent

active

047688572

ABSTRACT:
A multifilament type plastic optical fiber having a substantially uniform cross-section and an islands-in-sea structure, in which 10 to 10,000 islands are arranged in the sea, the respective islands have a substantially uniform cross-section having a diameter of 10 to 200.mu. and the sea occupancy ratio in the cross-section of the optical fiber is 5 to 40%, said optical fiber being prepared by constructing a true conjugate spinning spinneret by (a) an orifice plate having 10 to 10,000 core-forming holes, (b) an orifice plate having 10 to 10,000 sheath-forming holes and (c) an orifice plate having 10 to 10,000 sea-forming holes having an opening expanded downward, the lower ends of every two adjacent sea-forming holes having contacted with each other on the lower end face of said orifice plate, so that a fiber comprising the sea and islands having a core-sheath structure is formed by true conjugate spinning without using a filament-gathering orifice plate, supplying a core-forming polymer, a sheath-forming polymer and a sea-forming polymer to respective spinning holes, melt-spinning the polymers under such conditions that the spinning draft D defined by the following formula [I]:

REFERENCES:
patent: 3767372 (1973-10-01), Elliot
patent: 4381269 (1983-04-01), Kaino et al.

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