A heat tracing cable cross-linked polyolefin insulation layer extrusion process

Abstract

The invention discloses a heat tracing cable crosslinking polyolefin insulating layer extruded wrapping technology. An insulation layer extruded type die is provided, and comprises an inner die core, an outer die sleeve, an upstream concentric guide sleeve, and a downstream concentric guide sleeve. The upstream concentric guide sleeve and the downstream concentric guide sleeve comprise hard guide sleeve outer sleeves and guide sleeve rubber rings disposed in the hard guide sleeve outer sleeves. The heat tracing cable crosslinking polyolefin insulating layer extruded wrapping technology comprises steps that S1, a direction of a to-be-extruded and wrapped cable is adjusted, and then no friction is generated between the to-be-extruded and wrapped cable and the inner wall of the inner die core, when the to-be-extruded and wrapped cable passes through the inner die core; S2, the position of the upstream concentric guide sleeve and the position of the downstream concentric guide sleeve are adjusted, and the guide sleeve rubber rings of the upstream concentric guide sleeve and the downstream concentric guide sleeve are not deformed; S3, a position of an upstream tension pulley and a position of a downstream tension pulley are adjusted, and then the guide sleeve rubber rings of the upstream concentric guide sleeve and the downstream concentric guide sleeve are not deformed. Concentricity quality of insulation layers of products such as cables or heat tracing bands is guaranteed.

Description

technical field [0001] The invention relates to the technical field of processing equipment for cable or heating cable products, in particular to a heat tracing cable cross-linked polyolefin insulating layer extrusion process. Background technique [0002] The processing technology of products such as cables or heating cables mainly includes drawing, twisting and covering: drawing is mainly used to process the conductive core of cables or heating cables, and the metal rod or thicker metal wire is forced through the mold by pulling force , the cross-sectional area of ​​the metal rod or metal wire is compressed and obtains the required cross-sectional shape and size; twisting is to improve the softness and integrity of the cable or heating cable core, and to overcome the single cable or heating cable core The skin effect exists, and multiple single wires are intertwined together in a predetermined direction; coating mainly refers to wrapping one or more layers of insulating ma...

AI Technical Summary

Problems solved by technology

The factors that affect the eccentricity of the insulating layer of products such as cables or heating cables are mainly divided into two parts: one is the plasticization of the insulating material itself, specifically the melting temperature of the plastic, the shear strain rate of the insulating material, and the melting and heating of the plastic. Mixing time and other process parameters; the second is the concentricity of the cable and the mold when the insulating material is extruded. When the tension of the cable is not enough or the concentricity with the mold is poor, although the cable The concentricity at the extrusion port of the inner mold core can be guaranteed, but the concentricity at the extrusion port of the cable and the outer mold sleeve will have a large deviation, which will affect the eccentricity of the insulating layer

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