Development of Enamel Coating Technology
The development of enamel has a long history. Throughout the history of enamel, we will find that every development and evolution of enamel technology marks a milestone breakthrough in enamel technology. Therefore, it is very necessary to understand the history of enamel coating development.
The use of enamel slip is called wet enamel coating, and the use of enamel powder is called dry enamel coating. Dry enamel coating is the earliest recorded enamel coating method, which can be traced back to the Byzantine period, namely the cloisonne method. Between 1800 and 1835, the world's first enamel factories using cast iron as the metal substrate appeared in Europe. At that time, cast iron enamel was painted with dry powder. Until the 20th century, the second dry powder coating method appeared - electrostatic dry powder coating.
The dry method is used almost exclusively for the enameling of cast iron, while the wet method is used not only for the enameling of cast iron, but also for the enameling of steel plates. Dip enamel is the earliest and easiest enamel coating method for wet enamel coating. Later, the spray gun was invented, which further promoted the development of the enamel industry, especially for the coating of large-scale products. Wet enamel spraying is to spray the enamel slurry on the blank with the help of compressed air with a spray gun. In the middle of the 20th century, it was invented to make the enamel dry powder sprayed by the spray gun adsorb on the blank to be sprayed by means of electrostatic attraction, which is called dry method. Spray enamel. It was not until the late 1970s, when electrostatic powder enamel was invented, that the dry method was applied to the enamelling of steel enamel.
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