WCA November 2020

Technology news

Cable taping and high-speed braiding

❍ ❍ Copper-clad aluminium magnesium wire

Zhejiang Superlink Group, established in 1990 and located in Hangzhou, China, develops and manufactures cable materials and machines for aluminium magnesium alloy wire, aluminium foil Mylar tape, PET, CCS, CCAM/CCA, PVC compounds, HDPE/ LDPE compounds and PVC wrappers, as well as high-speed braiding machines, rewinding machines and physics foam extruders. The aluminium magnesium alloy wire is bright and unstained, providing acid and alkali resistance, corrosion resistance, high strength and toughness, without easy deformation under high temperature (120°C). For the aluminium foil Mylar tape, the raw material of aluminium polyester tape is soft aluminium foil and a polyester film, compounded with intaglio coating, slitting and rolling. Polyester tape is slit film that wraps and binds conductors, separating them from cable fillers. This product is composite with the aluminium film and becomes the cable film. Copper-clad steel (CCS) wire uses cladding or plating to form copper around the steel coil, to create atom bonds between the two metals. It can be processed like a single metal – when pulling out, annealing, and drawing the copper, the steel proportion to the diameter changes, but the copper layer remains the same. The high- frequency signal causes a “hasten skin effect” characteristic, so for copper- clad steel wire in high-frequency

signal transmission (more than 5 MHz), the conductivity is the same as pure copper wire. Copper-clad aluminium magnesium (CCAM) wire uses an advanced welding and copper plating process in production. The copper layer uses 99.9 per cent purity copper with high density and better conductivity. Superlink’s metallurgical bonding technique ensures that the copper cladding is evenly distributed around the aluminium magnesium coil along the wire, for better concentricity. PVC compounds for wires and cables, based on PVC resin, are made into granules by mixing, plasticisation and granulation, adding plasticiser, stabilising agent, pigments, etc. HDPE/LDPE compounds are synthesised under low pressure, for a mainly linear molecular structure with little branching. With a high degree of crystallisation and high density, they can withstand high temperatures, and have good rigidity, mechanical strength and resistance to chemical corrosion. The company’s high-speed braiding machine adopts frequency conversion technology, with a programmable logic controller and touchscreen. Features include stepless speed adjustment, controllable tension adjustment and auto-lubrication, with timing and comprehensive fault protection. Superlink – Hanyang (Hangzhou) Cable Co, Ltd www.coaxialcablecn.com

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Wire & Cable ASIA – November/December 2020