Manufacturing method of heat tracing tape with extruded insulating layer

Abstract

The invention discloses a manufacturing method of a heat tracing tape with an extruded insulating layer, which relates to the field of heat tracing tapes. The manufacturing method includes the following steps: (1) preparing metal wire electrodes; (2) preparing a resin conductor layer; (3) irradiation cross-linking; (4) preparing a heating PTC core tape through extrusion; (5) preparing an insulating layer; (6) insulation extrusion; and (7) second irradiation cross-linking. The structure of the heat tracing tape with an extruded insulating layer is innovative in that a resin conductor layer is added between the electrodes of the product and the heating body, which improves the interface contact resistance and prolongs the service life of the product. The technology is innovative: a dual-coredual-layer co-extrusion process is adopted, which ensures that the resin conductor layer and the PTC heating body can be molded at the same time and bonded together in a melting state, achieves goodcontact and reduces the expansion difference; a manufacturing method of equal-tension normal-structure strands is used to improve the manufacturing precision of twisted conductors and ensure the needfor super-thin and large-length extrusion of the resin conductor layer; and the safety performance of insulation extrusion is high. The performance of the product is innovative: second irradiation cross-linking is added, which improves the stability of temperature and the durability of the product.

Description

technical field [0001] The invention relates to the field of heating cables, in particular to a method for manufacturing heating cables with extruded insulating layers. Background technique [0002] Self-limiting temperature heating cable (hereinafter referred to as heating cable) is also called self-regulating electric heating cable or temperature-controlled heating cable. It is a strip-shaped temperature-limiting tracer whose electric heating power is self-adjusting with the system temperature. The heating element of the heating cable is a layer of conductive plastic with a positive temperature coefficient that is uniformly extruded between two parallel metal busbars. Conductive plastic is connected across two parallel busbars to form a parallel circuit resistance heating element, which can automatically adjust the output power and the released heat according to the temperature change of the heated system, so as to achieve the purpose of automatic temperature limit and en...

AI Technical Summary

Problems solved by technology

The self-limiting temperature electric heating belt is mainly composed of semiconductor materials, such as PTC materials, the starting current is particularly large when the pipeline is antifreeze and heat-preserving. Generally, the starting current is 3 to 6 times the normal working current or even higher, because the self-limiting temperature The working principle of the electric heating belt is to change according to the change of the ambient temperature, that is, the lower the temperature, the higher the starting current, and the lower the temperature, the higher the starting power. Large, and because of poor stability, there are serious safety hazards; on the other hand, in the production process, the material of the self-limiting temperature heating cable has many uncertain factors, often a certain There is a little difference in raw materials, which makes it difficult to control the quality of self-limiting heating cables, so the quality of self-limiting heating cables in the market is uneven, and the quality is difficult to guarantee

The latter industrial constant power electric heating cable, due to its high production cost, limits its popularization and use in the civilian field.