There are various enamel coating processes for enamel products. In addition to wet enamel coating and dry powder coating, there are also special enamel coating methods such as direct enamel coating, two enamel and one firing, and inner white and outer color decorative enamel. Cast iron enamel is a large category in the enamel category, and the demand is strong, and due to the variety of cast iron enamel products, the choice of enamel frit and enamel coating method will also be different, how to choose the enamel frit and enamel coating suitable for your products. Way? How to do it? Today, we will explain in detail, and recommends cast iron enamel manufacturers to collect them.

The spraying process of cast iron enamel is mainly dry powder spraying and enamel spraying. Dry powder spraying is divided into powder coating and dry electrostatic coating. Powder coating is suitable for large castings, such as sanitary ware (cast iron enamel bathtub, enamel washbasin, etc.), it is necessary to spray wet ground coat and burn it, then preheat the workpiece to 750 ℃ ​​~ 830 ℃, and evenly pre-grind the powder Sprinkle on the workpiece, and then put it into the firing furnace to burn. The dry powder can be put into the furnace at high temperature. The ground coat is generally used for white ground coat, especially for colored enamel products. The fired ground coat has air permeability.

Enamel slurry spraying is suitable for all kinds of cast iron enamel products. The workpiece after enamel coating needs to be dried in the furnace. The drying temperature is 200 °C, and the temperature of the workpiece is about 160 °C or less. The temperature should not be too high, otherwise cracks will easily occur. The firing temperature is generally below 790°C, and the time is set to 10~15min. The enamel top enamel is usually ground with a cast iron base enamel and pigmented.

Cast iron enamel is mostly sprayed by spray gun, because cast iron castings are heavier than steel plates, and the inner and outer coatings are different, so it is difficult to use the dipping method. The diameter of the spray gun is 1.2~1.5mm, and the volume of the hand-held spray gun tank is generally 500~750ml.

The specific gravity and fineness of the enamel slurry: the fineness of the ball-milled enamel slurry should be 60~80 mesh. The proportion of enamel slurry: the ground coat is 1.62~1.66, and the cover coat is 1.65~1.73.