V electrothermal film is a kind of electrothermal element that directly converts electric energy into heat energy. Like electric heating tubes, rods, plates, heaters, rice cookers and induction cookers, it is an indispensable part of the huge electric heating product family. But the difference is that electrothermal film is a relatively new product category in China, and its application history is only about ten years, and its application field is far less extensive than other electrothermal products, so people's understanding and understanding of electrothermal film has not yet reached the level of popularization.

Electric heating film, English name is "hotfilm" or "elec trothermalfilm", Japanese name is "surface heater". It is difficult to find the exact definition of electrothermal film in textbooks and dictionaries at home and abroad. A few years ago, the definition of electric heating film in China was mainly based on the promotional materials of electric heating film manufacturers, mainly based on carbon-based inks, such as: "Electric heating film is a translucent polyester film, which can heat up after being electrified. In 2005, the project report of the former Ministry of Construction on the construction industry standard of electric heating film, also called "low-temperature radiation polyester electric heating film", obviously refers to carbon-based ink electric heating film, which was later changed to "low-temperature radiation electric heating film". In recent years, with the technical progress, large-scale production and market application of all kinds of electric heating films, people have the opportunity to gradually understand and understand all kinds of electric heating films. How to define electric heating films more accurately has become one of the issues of general concern and discussion in the industry.