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. For copper cables, the primary choice is 100 ohm unshielded twisted pair and 100 ohm coaxial cables. For optical fibers, the primary choices are 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 further divided into two types: reclaimed wire and cable, and outdoor and indoor cables. These cables differ in both performance and construction. Copper and fiber optic cables can also be categorized into two main types: outdoor cables (including six types 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, meeting the specific environmental requirements of the installation location. Common installation methods include underground cables (installed in pipes), cables placed in underground tunnels and holes, which may contain either hollow or solid cables, with a protective layer as the sheath. Directly buried cables are laid in trenches without pipe protection and are equipped with an additional protective layer. Overhead cable racks are mounted on poles between buildings.
Basic performance of recycled cable recovery ground wire is to effectively propagate electromagnetic waves (fields) according to electromagnetic field theory: the ground 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 aspects:
(1) Electrical Performance Guidelines include electrical properties, electrical insulation properties, and transmission properties. Electrical insulation properties generally refer to cable products, with the main recycling projects for waste electrical wires and cables being insulation resistance, dielectric constant, dielectric loss, and voltage withstand characteristics. Transmission properties mainly refer to high-frequency transmission characteristics 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, thermal and heat dissipation characteristics of power cables, current carrying capacity, short-circuit and overload capabilities, thermal deformation and heat shock resistance of synthetic materials, thermal expansion of materials, and drop performance of impregnated or coated materials.
(4) Corrosion resistance includes resistance to electrochemical corrosion, biological and bacterial侵蚀, chemical substances (oils, acids, alkalis, chemical solvents, etc.)侵蚀, and salt spray performance.
(5) Weather resistance refers to the ability of recycled wire and cable products and their constituent materials to maintain their original properties (sunlight resistance, cold resistance, anti-mold, and moisture resistance) under the influence of mechanical (should) stress, electrical stress, thermal stress, and various external factors, as well as under the conditions of external climate.
(6) Other performance indicators include the physical properties of certain materials (such as hardness and creep resistance in metallic materials, compatibility in polymers), as well as specific usability of the products (such as flame retardancy, resistance to atomic radiation, insect-proof, transmission, and energy damping).
