The skeleton material of ADSS optical cable is usually made of glass fiber reinforced plastic (FRP). Since the tensile modulus of FRP is 50GPa, it is less than the tensile modulus of 200GPa of steel wire used as a tensile element in conventional optical cables. The tensile force is much greater than that of conventional fiber optic cables, so it is not possible to rely solely on the FRP skeleton as a tensile element. The main tensile elements are aramid fibers stranded in a jacket layer.
Aramid fiber (Poly paraphenylene terephthalamide) is an aromatic polyamide fiber, which is made of p-phenylenediamine (PPD) and terephthaloyl chloride (TDC) monomers in NMP, CaCl2 solvent. aggregated in. In aramid fiber, the molecular chain has extremely high viscosity in the longitudinal direction, and is 100% parent crystal structure, so it has high tensile strength and modulus. Due to the unique chemical structure and properties of these fibers, the U.S. Federal Trade Commission named them Aramid in 1974 to distinguish them from any other man-made fibers. Aramid's trade name is Kevlar from American DuPont Company; the trade name of Netherlands AKZO NOBEL Company is TWARON.
Kevlar49 (polyparabenzamide) is a material with the highest strength and the lowest thermal expansion coefficient among the aramid fibers. It is suitable for use as a strength material for optical cables, and its monofilament tensile modulus is 120GPa. In the design calculation of ADSS optical cable, usually only aramid fiber is calculated as the strength element. That is, the cable strain is calculated by the tensile modulus E and its cross-sectional area S of the aramid fibers in the cable structure. In the calculation, the contribution of FRP as the skeleton to the tensile strength of the optical cable is not considered. In this way, the tensile factor of FRP can be considered as a strength safety factor in the design of ADSS optical cable.
Hunan GL produces the ADSS fiber optical cable that uses the high-quality Aramid for material, so the tensile performance is strong, we can supply 50 up to1500m span ADSS Fiber Cable, Welcome to consult us.