Extruded insulated cables, also called rubber-plastic cables, are power cables with high polymer as the insulating layer. Extrusion type insulation has many advantages. With the development of material properties and varieties, and the diversification of special equipment, most cable manufacturers in the industry have adopted this type of insulation structure and process.
The characteristics of the extruded insulation process are as follows:
(1) Polymer materials are a large class of materials with the fastest development, the most variety and the widest performance in recent decades, which can promote the upgrading of cable products. The extrusion insulation process is just suitable for the use of thermoplastic materials with good viscous flow properties and easy control after heating. Such as plastics, thermoplastic elastomers and unvulcanized rubber compounds.
(2) The extruded insulation can form a closed sleeve structure with uniform thickness, which is beneficial to ensure the insulation performance.
(3) The extrusion process is single and the production speed is fast. At the same time, the scope of application is wide. Use equipment of different specifications. In addition to being applicable to different materials, insulating layers of different thicknesses can also be manufactured. And it is conducive to forming a production line with several processes in tandem. Such as the core production line of communication cables in the city; three extruders tandemly extrude the inner and outer semi-conducting layers and insulating layers, then cross-linked and cooled cross-linked cable production lines; and three-layer co-extruded rubber-sheathed cable continuous Vulcanization production line; there are parallel production lines with dual extruders, etc.
These have not only accelerated the development of wire and cable manufacturing technology, but also the reason why the extruded insulation structure is widely used in cable products.
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