General Requirements For Raw Materials For Optical Fiber Cable Production

Regarding to the general requirements for raw materials for optical fiber cable Production, Fiber cable manufacturers will give you a detailed introduction today:

 1. Outer sheath: Indoor optical cables are generally made of polyvinyl chloride or flame-retardant polyvinyl chloride, and the appearance should be smooth, bright, flexible, and easy to peel off. The outer sheath of inferior optical cables has poor finish, and is easy to adhere to tight sleeves and aramid fibers.

The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the sheath is flat, bright, uniform in thickness, and free of bubbles. The sheath of inferior optical cables is generally produced with recycled materials. The outer sheath of this kind of optical cable is rough, because there are many impurities in the raw material. If you look closely, you can find that there are many tiny pits in the outer sheath of the optical cable. After laying for a period of time, it will crack and seep.

2. Optical fiber: Regular optical cable manufacturers generally use A-level fiber cores from major manufacturers. Some low-priced and inferior optical cables usually use C-level, D-level optical fibers and smuggled optical fibers from unknown sources. These optical fibers have a long delivery time due to their complicated sources. It has often become damp and discolored, and multimode fibers are often mixed with single-mode fibers. Generally, small factories lack necessary testing equipment and cannot make judgments on the quality of fibers. Because the naked eye cannot distinguish such optical fibers, the common problems encountered during construction are: the bandwidth is very narrow, the transmission distance is short;

3. Reinforced steel wire: The steel wire of the outdoor optical cable of regular manufacturers is phosphating-treated, and the surface is gray. Such steel wire does not increase hydrogen loss after being cabled, does not rust, and has high strength. Inferior optical cables are generally replaced by thin iron wires or aluminum wires. The identification method is very easy-the appearance is white and can be bent at will when pinched in the hand. The optical cable produced by such steel wire has a large hydrogen loss, and after a long time, the two ends of the optical fiber box will rust and break.

4. Steel armor: regular production enterprises use double-sided anti-rust coating longitudinal wrapping steel strips, and inferior optical cables use ordinary iron sheets, usually only one side has been treated with anti-corrosion.

5. Loose tube: PBT material should be used for the loose tube in which the optical fiber is installed in the optical cable. Such a tube has high strength, no deformation, and anti-aging. Inferior optical cables usually use PVC material to produce sleeves. The outer diameter of such sleeves is very thin, and it will be flat when pinched by hand. It is no different from a drinking straw. It will lose its protective effect on the optical fiber within one to three years.

6. Fiber paste: The fiber paste in the outdoor optical cable can prevent the oxidation of the optical fiber. Due to the moisture ingress, the fiber paste used in the inferior optical fiber is very little, which seriously affects the life of the optical fiber.

7. Water-blocking tape: The water-blocking tape for optical cables passes through the strong water-absorbing properties of the superabsorbent resin that is evenly distributed inside the product. The resin can quickly enter pure water more than 350 times its own weight. Moreover, once the water-blocking powder meets water, it will immediately expand the gel. At this time, no matter how much pressure is applied to it, the water will not be squeezed out. Therefore, if the cable is covered with a water-blocking tape containing water-absorbent resin, in case the outer wall of the cable is damaged, the superabsorbent resin in the wound part will expand to exert a sealing effect, and the ingress of water can be prevented to a minimum. Inferior optical cables usually use non-woven fabrics or paper tapes. Once the outer sheath of the optical cable is damaged, it will cause serious consequences.

8. Aramid: Also known as Kevlar, it is a high-strength chemical fiber. It is currently used most in the military industry. Military helmets and bulletproof vests are produced from this material. Indoor optical cables and electric overhead optical cables (ADSS) both use aramid yarns as reinforcements. Due to the high cost of aramid fibers, inferior indoor optical cables generally have a very thin outer diameter, which can save costs by reducing a few strands of aramid fibers. The fiber optic cable is easily broken when passing through the pipe. The number of strands of aramid fibers used in the ADSS optical cable is determined according to the on-site span and the wind speed per second. Be sure to check and confirm carefully before construction.