| 摘要 |
PURPOSE:To reduce increase of intensity in water and loss of thermal conduction, by forming an inner coating layer of a silyl-modified org. polymer on the uncoated part of a pair of optical fibers, setting a tension resistant member to said layer, and reinforcing it with a heat outer shrinkable layer. CONSTITUTION:In the case of jointing by welding each end of the uncoated part 3A, 3B of a pair of coated optical fibers in a state of each end to be connected being butted with each other, the joint is reinforced by the following procedures: forming the inner coating layer made of a silyl-modified org. polymer contg. a silanol condensing catalyst on the outer circumference of both uncoated parts; laying a tension resistant member 6 of a stainless steel wire on the longitudinal sides of both uncoated parts 3A, 3B, and further forming a heat shrinked outer coating layer 5 made of a cross-linkable PE heat shrinkable tube. As the inner layer 4, a graft polymer obtd. by bringing vinylmethoxysilane into reaction with ethylene-vinyl acetate copolymer as a base material in the presence of dicumyl peroxide, contg. dibutyl tin dilarate-4,4'-thiobis, or the like is used. |
