| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coated plastic optical fiber having an excellent dispersion characteristic of an additive and a protective layer of a constant thickness by forming a colored protective layer on a plastic optical fiber (POF). SOLUTION: The POF 14 is coated with a metallic die having a die 120 and nipple 121 and the coated optical fiber is obtained. Low density polyethylene (LDPE) 129 of which the MFR (M1) is 40 and the melting point (Ta) is 120°C and a master batch 130 containing 10 wt% carbon black in LDPE are mixed at the rate 99:1 (weight ratio) to obtain a coating material 131. The protective layer is formed by coating with the coating material 131 on the POF 14 with an extruder 126. Thus, the protective layer 132 having the excellent dispersion characteristic of the additive and the protective layer 132 of a constant thickness Tc is formed. COPYRIGHT: (C)2006,JPO&NCIPI
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