The difference between dry and wet powder enamel
Many people who are not very familiar with enamel processing technology can't tell what is dry powder enamel and what is wet powder enamel. Today expert from Nolifrit will answer from the perspective of enamel frit manufacturers. As the name suggests, dry powder enamel does not require water during the enamel coating process, while wet powder enamel requires water as a medium during the enamel coating process. So what is the specific difference?
With the development of the enamel industry, the degree of specialization has greatly increased. Many factories only process enamel, and do not set enamel slurry or grinding workshop. This requires professional enamel frit manufacturers to provide ready-to-use enamel powder for electrostatic spraying or wet process with just adding water and stirring.
So from this perspective, the enamel powder is added with water and mixed evenly (sometimes a little ball milling is needed), and then the wet enamel slurry is applied to the metal body. The method of coating is called wet process, or wet powder enamel.
(Wet process of enamel coating)
While the method of coating and enameling the dry enamel powder without adding water to the metal body is called dry process or dry powder enamel. There are two other processes for dry powder enamel. The first is to electrostatically adsorb the charged enamel dry powder particles to a metal body with a heterogeneous charge; the second is to dust dry enamel powder directly on metal body, this is mostly used on sanitary ware.
(Dry process of powder enamel)
Ready to use enamel powder is powdery enamel material, which is made of special enamel frit or a certain proportion of enamel frit, clay and abrasives. The former is used for dry powder electrostatic spraying or cast iron dust enamel, and the latter is used for various wet coating. When using pre-ground enamel powder for wet coating, usually only water is needed to stir and mix. Factories with special requirements for the fineness of enamel slurry can also use a ball mill for grinding.
Pre-ground enamel powder has the advantages of high professionalism, convenient operation, easy storage, energy saving and environmental protection. Pre-ground enamel powder has been widely used in the fields of architectural enamel decorative boards, water heater liners, direct-on enamel products and GGH enamel heat exchange components.