【 Weak current College 】 cable production of raw materials for the General requirements

A, jacketing: indoor optical fiber cable General vinyl is recorded or flame-retardant vinyl record, appearance should be smooth, glossy, highly flexible, easy to split. Poor quality cable jacketing finish is very poor, vulnerable and tight sleeve, aramid adhesion.

Outdoor optical cable PE sheathed should adopt high-quality black polyethylene, cabling after peeling skin, glossy, thickness, no bubble. Poor quality cable peeling general use recycled materials in production, this cable epidermal rough, the material has a lot of impurities, a closer look to find cable jacketing have many very small pits Wow, laying over time will crack, water seepage.

2. fiber: regular cable production enterprises generally use A large number of low-fiber core, poor quality cable typically use the C-level, D-class fibre and dubious of smuggling fibre optic light sources, these are complex, lengthy, the factory often have a tide stain, and was multi-mode fibre also often mixed up with single-mode fiber, but generally little factory lacks the necessary testing equipment, not on fiber quality. Due to the naked eye cannot discern the fiber, construction touch often questions is: bandwidth is very narrow, transmission distance short; weight is not uniform, and the lack of fiber pigtail butt; flexibility, spare time a curved fiber is broken.

III. strengthening wire: formal manufacturer of outdoor optical cable wire is after phosphating treatment, the surface is grayed out, this wire cabling does not increase hydrogen loss, not rusty, the intensity is high. Poor quality cable for general use fine wire or aluminum wire, identification is easy--looks white, pinch in hand can be bent. This steel wire production of fiber optic cable hydrogen loss big, a long time, hanging optical fibers box at the ends of the breaks are rusty.

4. steel plate: formal production enterprises adopt double-sided brush antirust coating of longitudinal dressed sharp steel belt, poor quality cable is ordinary metal, usually only one side had anti-rust treatment.

5. loose tube fibre optical cable in the Pack: the loose tube should use PBT material, this casing the intensity is high, no distortion, anti-aging. Poor quality cable PVC material production are usually used, this set of casing diameter thin hand a pinch on the flat, and drink the Eyedropper, one to three years loses the protective effect of fiber. Information from: transmission and distribution equipment

6. fibre plaster: outdoor optical cable in the fiber cream prevents oxidation, due to water vapour optical fiber into the tide, inferior fibre in the gypsum fiber is small, serious impact on the life of the fiber.

VII. resistance hose: cable waterblocking tape inside through the product evenly superabsorbent resin has a strong suction performance, saturated pressure, affinity, rubber elasticity of common role, 1g absorbent can rapidly into a major than from 350 times more water. And, once the water drag gouache on as soon as expandable gel, no matter how much pressure is applied to it, water will not be squeezed out. Therefore, the use of absorbent water with encapsulated cable if the cable outer damage, cuts parts of absorbent for expansion and the sealing effect, you can play the water entered the block to a minimum. Poor quality cable usually use non-woven fabric or paper tape, once cable jacketing damaged, serious consequences will be.

8 Kevlar: also known as Kevlar, is a high intensity of chemical fiber, present in most of the military industry, military helmets and body armour is this material production. The world's only DuPont and Netherlands of Akzo can produce, the price is about more than just in case. Indoor optical fiber cables and power overhead cables (ADSS) are made of aramid yarn, fiber and strengthened due to the high cost, low quality of indoor optical fiber cables in general very thin outer diameter, so that you can reduce the number of shares, aramid cost savings in the wear of the optical tube time easy to pull off. ADSs are based on field span, wind speed/sec to determine the use of fiber optic cable in Kevlar number, be sure to double check before construction, confirm.