Some workpieces are relatively complex in shape and relatively small. The spraying method is a waste of paint, and the brushing method is labor-intensive. If the dipping method is used, it can save labor and materials. Therefore, general small hardware parts, metal pipes, frames and sheets, etc., are most suitable for dip coating construction. The dip coating method is to use a hanging hook to dip the workpiece to be painted into the varnish, and take it out for about 1 minute. The excess paint liquid drips back into the tank again, and when the paint liquid no longer drips, it can be baked or dried naturally.
Generally, the dipping varnish should be equipped with a stirrer, and it should be stirred every once in a while to prevent the pigment from precipitating in the lacquer liquid. However, during varnish dipping, it should not be stirred to prevent paint bubbles.
The viscosity of the paint directly affects the thickness of the coating. Generally, the viscosity of 30~40s (coating 4 cups) is more suitable.
Bare-shaped workpieces, single color, large batches, require mechanized or automated continuous production of assembly operations, and dipping paint construction is a satisfactory method.
However, dipping paint also has certain limitations and disadvantages. First of all, the workpiece should not be too large. It is not suitable for workpieces with concave surfaces that will accumulate paint. Because it is easy to produce flow marks and uneven thickness, the decoration is poor. For volatile methods such as nitro lacquer, it is not suitable to use dip coating method. Other materials such as serious pigment drift and easy caking do not use the dipping method for construction.
