Miniature optical cable, method for preparing same and outer sheath material for miniature optical cable

[0019] Such as figure 1 As shown, the present invention provides a kind of miniature optical cable, a kind of miniature optical cable, comprises cable core, and described cable core is stranded by central reinforcing steel wire 2 and several bundle tubes 3 that surround outside strengthening member, and in There are several optical fibers 1 inside the bundle tube 3; a stainless steel belt 6 is wrapped around the cable core, and a rodent-proof and flame-retardant outer sheath 4 is extruded on the outermost layer of the cable core; the stainless steel belt layer is a double-layer wrapping structure , it is not easy to be pried open by mice, which has the effect of preventing rats from biting; and coating the heat insulation film on the surface of the stainless steel belt layer, which effectively achieves the effect of heat insulation; there are several auxiliary reinforcements inserted in the rodent-proof flame-retardant sheath Wire 5.

[0020] As a further improvement, the materi

[0025] The present invention also provides a kind of preparation method of miniature optical cable, comprises the following steps:

[0026] 1) The optical fiber 1 is colored by UV curing, the fiber 1 pay-off tension is 65g±5g, the take-up tension is 75g±5g, and the production speed is 1200m / min. (Compared with conventional production, this process increases the tension of pay-off and take-up, and at the same time reduces the production speed from 2400m / min to 1200m / min.) Through this kind of process adjustment, the quality of optical fiber arrangement is guaranteed, and it is convenient for the optical fiber in the micro-bundle tube I long control.

[0027] 2) Since the outer diameter of the bundle tube 3 is only 1.6, the space inside the tube is too small. In order to reduce the fiber breakage of the optical fiber 1 in the tube, the front oil needle is changed from a squeeze tube type to a bald oil needle.

[0028] 3) The material of the bundle tube 3 is changed from PBT

[0034] The present invention also provides an outer sheath material of a miniature optical cable, comprising the following components in parts by weight: 100 parts of high-density polyethylene, 54 parts of flame retardant, 20 parts of smoke suppressant, 12 parts of EVA, 4 parts of carbon black 4 parts, 4 parts of repellent, 0.5 part of stabilizer, 0.5 part of biasing agent, 5 parts of lubricant, 5 parts of Linglong grass powder.

[0035] Wherein, the flame retardant is magnesium hydroxide, and the smoke suppressant is hydrocarbon.