Metal flexible heating film and preparation method thereof

Abstract

The invention provides a metal flexible heating film and a preparation method thereof. The metal flexible heating film comprises a metal electrode, and a first insulated thin film layer, a metal heating layer, a second insulated thin film layer and a heat insulation and heat conduction layer overlapped sequentially from bottom to top, wherein a plurality of conductive alloy strips are uniformly distributed on the metal heating layer; the metal electrode is electrically connected with the metal heating layer; the first insulated thin film layer is uniformly applied to the lower surface of the metal heating layer; the second insulated thin film layer is uniformly applied to the upper surface of the metal heating layer; and the heat insulation and heat conduction layer is a graphite layer and is laid on the upper surface of the second insulated thin film layer, and the graphite content is no less than 99%. The heating film can effectively solve the problems of use safety and service life caused by local overheat of the heating film.

Description

technical field [0001] The invention belongs to the field of metal processing, and in particular relates to a metal flexible heating film and a preparation method thereof. Background technique [0002] Metal flexible electric heating film is a semi-transparent or fully transparent film heater with a sandwich structure. The upper and lower surfaces are insulating films with excellent temperature resistance and insulation performance, and the middle is a resistive circuit made of special alloy foil. [0003] There are generally two types of metal flexible electric heating films: high-temperature polyimide metal electric heating films and low-temperature PET metal electric heating films. It has excellent dielectric strength; excellent dielectric strength; excellent heat conduction efficiency; the heating element is made of special alloy foil, which has excellent resistance stability. This makes it widely applicable to the heating field and can obtain quite high temperature con...

AI Technical Summary

Problems solved by technology

However, this electrothermal film heater cannot solve the problem of poor thermal conductivity of the insulating layer. It has the problems of high power density per unit cross-sectional area, high surface temperature, large local expansion coefficient, easy deformation, and noise during operation. The high local expansion coefficient causes problems such as short circuit of the heating wire, sparking, and rapid oxidation.

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