Cable wires have a wide range of applications, which has led to the development of the cable recycling industry. Their usage is categorized into two types: optical fibers and copper cables. Copper cables primarily use 100 ohm unshielded twisted pair and 100 ohm coaxial cables. Optical fibers mainly use 62.5/125um multimode fibers and 10/125um single-mode fibers. That is, what is commonly referred to as copper wire, aluminum wire, and so on.
Copper and fiber optic cables, multi-purpose branch cables, can be divided into two basic types: reclaimed wire and cable scrap, and outdoor and indoor cables. These cables differ in performance and construction. Copper and fiber optic cables can also be divided into two fundamental types: outdoor cables (including six categories of FTP shielded cables) and indoor cables. These cables vary in function and construction. Cables designed for indoor use have an air-core inside with a flame-retardant jacket on the outside. Such cables can also be used in environments with harmful gases. Outdoor cables are commonly used between buildings and can meet the specific environmental requirements of the installation location. Common installation methods include underground cables (installed in pipes), cables installed in underground tunnels and holes, which may contain hollow or solid cables with a protective sheath, direct burial cables laid in trenches without pipe protection, and overhead cables supported by poles between buildings.
Basic performance of recycled cable grounding wire is to effectively propagate electromagnetic waves (fields) according to electromagnetic field theory: the grounding wire is a transmission line for broadcasting, where electromagnetic waves propagate in a specified direction, and during the process of propagation along the line, the conversion of electromagnetic field energy is achieved.
Generally, its basic performance is summarized into six key items:
(1) Electrical performance includes electrical, insulation, and transmission properties. Insulation properties typically refer to cable products, with key recycling projects including insulation resistance, dielectric constant, dielectric loss, and voltage withstand characteristics. Transmission properties mainly refer to high-frequency transmission and anti-interference properties.
(2) Mechanical properties include tensile strength, elongation, flexibility, elasticity, softness, vibration resistance, wear resistance, and impact resistance, among others.
(3) Thermal properties include the product's heat resistance grade, operating temperature, the heating and cooling characteristics of power cables, current carrying capacity, short-circuit and overload capabilities, the thermal deformation and heat shock resistance of synthetic materials, the thermal expansion of materials, and the dripping performance of impregnated or coated materials.
(4) Corrosion resistance includes resistance to electrochemical corrosion, biological and bacterial侵蚀, chemical agents (oils, acids, alkalis, chemical solvents, etc.) erosion, and salt spray performance.
(5) Weatherability refers to the ability of recycled wire and cable products and their constituent materials to maintain their original properties (sunlight resistance, cold resistance, mold prevention, and moisture resistance) under the influence of mechanical (should) stress, electrical stress, thermal stress, and other external factors, as well as under varying climatic conditions.
(6) Other performance specifications refer to the physical properties of certain materials (such as hardness and creep in metallic materials, compatibility in polymer materials) and some special usability features of the products (including flame retardancy, resistance to atomic radiation, insect resistance, transmission, and energy damping, etc.).
