Multifilament type plastic optical fiber

Details Multifilament type plastic optical fiber Multifilament type plastic optical fiber

G - Physics

02

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88/97

G02B 6/06 (2006.01) B29D 11/00 (2006.01) D01D 5/30 (2006.01) D01D 5/36 (2006.01) D01F 8/04 (2006.01)

Patent

CA 1298503

MULTIFILAMENT TYPE PLASTIC OPTICAL FIBER ABSTRACT OF THE DISCLOSURE 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 ~ 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 Image : D = (hole diameter of core-forming orifice plate)2/(core diameter of multifilament optical fiber)2 ,.. Image is 20 to 5,000, fusion-bonding the spun filaments on the lower end face of the spinneret, and taking up the formed fiber.

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