The Pros And Cons of 'Two Coat And One Firing'
Since the 1980s, different types of “two coat and one firing” processes have been developed. These processes can reduce enamel consumption, pollution and energy consumption, and have many obvious benefits.
The powder coating obtained by electrophoretic enameling of the steel body has high strength, and can be directly coated with the cover coat after electrophoretic enameling of the ground coat to achieve two enameling and one firing.
In actual production, electrostatic spraying is the most commonly used process of two enameling and one firing.
There are many combinations of two enamel and one firing process: dry ground coat-dry cover coat, wet cover coat -dry cover coat, wet ground coat-wet cover coat.
The development of the two enamel and one firing process mainly originated from the development of a ground coat that did not require nickel in the 1970s. This kind of ground coat is called free coating, which is easy and simple to clean the steel plate. In the beginning, the free ground coat was only used for wet spraying, but later it can also be used for dry spraying.
Due to the lack of a firing process in the two coat and one firing process, the production efficiency is greatly improved. The pre-treatment is only degreasing and no nickel is required. At present, the dry process of two enamel and one firing is relatively mature in the domestic construction and decoration enamel panel production. In foreign countries, the two enamel and one firing process is mainly used in the production of stove panels.