The number of varinishing times is affected by the solid content, viscosity, surface tension, contact angle, drying speed, coating method, and paint thickness of the paint liquid. Generally, enameled wire enamel needs to be painted and baked several times to fully volatilize the solvent, complete the reaction of the lacquer resin, and form a good paint film.
Varinishing speed
Coating solid content surface tension
Varinishing viscosity
Varinishing method
Speed, Height, Size, Thickness, Height, Felt Die
The first coat of paint is more critical. If it is too thin, the paint film will have a certain degree of air permeability, which will oxidize the copper conductor and eventually cause the surface of the enameled wire to become flowery. If it is too thick, the cross-linking reaction may be insufficient, the adhesion of the paint film will decrease, and the nib will shrink after unplugging.
The last layer of paint film is thinner, which is beneficial to the scratch resistance of the enameled wire.
In the production of fine-gauge wire, the number of paint passes directly affects the appearance and performance of pinholes.