Silane chemical cross-linking is a process that involves using polyethylene insulation material containing a silane cross-linking agent. The insulation layer is extruded using the 1+2 extrusion method, which includes the outer jacket, insulation layer, and inner insulation. After extrusion, the cooled cable core is immersed in hot water at a temperature of 85-95°C for hydrolysis cross-linking. This wet cross-linking process affects the moisture content within the insulating layer, limiting its voltage rating to a maximum of 10kV. On the other hand, irradiation cross-linking is a physical cross-linking method that uses modified polyethylene insulation. It also employs the 1+2 extrusion technique to create the outer jacket, insulation layer, and inner insulation. Once extruded, the cooled insulation core passes through an irradiation scanning window from a high-energy electron accelerator. The high-energy electrons penetrate the insulation uniformly, initiating cross-linking through energy conversion. Unlike chemical cross-linking, no additional cross-linking agents are needed. The resulting cross-linking bonds are strong and stable, offering superior heat resistance compared to chemically cross-linked cables. However, due to the limitations of the electron beam’s penetration depth (typically not exceeding 10mm), the voltage level of irradiation-crosslinked cables is also limited to around 10kV. Silane cross-linked cables have an advantage when it comes to lower voltage applications, such as below 6kV. The production process typically involves a high mixing machine, followed by a twin-screw granulator, then a shaking tank and vacuum packaging. This article was originally published on Plastic Sheet Extruder. For more details about PVC cable material granulators, you can refer to the image below.
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