Compressive skin-foam-skin insulated single wire and preparation method thereof

Abstract

The invention relates to a compressive skin-foam-skin insulated single wire. The compressive skin-foam-skin insulated single wire comprises a copper conductor, an inner skin layer wrapped outside the copper conductor, a central foam layer wrapped outside the inner skin layer and an outer skin layer wrapped outside the central foam layer, wherein the outer skin layer is made of a high-strength macromolecular insulating material. The compressive skin-foam-skin insulated single wire has low cost and relatively strong compressive performance. The invention also relates to a preparation method of the compressive skin-foam-skin insulated single wire. The method comprises the following steps of: extruding the outer skin layer, and extruding the inner skin layer and the central foam layer together after the outer skin layer is completely and uniformly wrapped on the copper conductor. Therefore, the problem that the outer skin layer made of the high-strength macromolecular insulating material cannot be smoothly extruded from a nose is well solved.

Description

technical field [0001] The invention relates to a digital signal cable insulated single wire used in the railway field, in particular to a structure and a preparation method of a pressure-resistant leather foam skin insulated single wire. Background technique [0002] In recent years, according to the leap-forward development idea of ​​the Ministry of Railways, railway signals will realize locomotive signalization as the main body and train overspeed protection, and gradually develop in the direction of digitalization, intelligence, integration and comprehensiveness, so as to adapt to the requirements of railway speed increase and passenger dedicated line. Construction needs, and the inner shielded railway digital signal cable was born under this requirement. The insulating single wire of the cable adopts a three-layer co-extrusion structure of leather foam skin, so that the electrical performance and mechanical physical properties of the cable product can be guaranteed. In a...

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Problems solved by technology

[0003] However, the flattening resistance of the existing skin-foam insulated single wire has always been the weak point of this product, and at the same time, it has buried a safety hazard to the product quality. In addition, with the continuous improvement of railway operation speed and use safety requirements, the Ministry of Railways It has been proposed that on the premise of ensuring the above performance, higher requirements are put forward for the flattening resistance of the skin-foam-skin insulated single wire

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