How to improve powder loading rate in dead corner by electrostatic spraying
Powder coating has high production efficiency and excellent film function. In the production, the equipment manufacturers through the improvement of electrostatic equipment spray gun and equipment technical transformation to advance the dead angle powder rate. Jiangmen plastic powder indicates that there are many factors that affect the rate of powder coating on the dead corner, which can be divided into external factors and internal factors. The external factors include the size and shape of the bending angle of the workpiece to be coated, the powder spraying system of the customer, the powder spraying construction personnel, etc., and the operational elements in the powder formula adjustment and spraying process, which belong to the internal elements.
1. Factors affecting the powder rate of powder coating in dead corner
Influence of the powder rate on the dead angle of powder
There are many elements, among which the two primary theoretical elements are the charge effect of powder.
2. Measures to deal with powder rate in dead corner of powder
The whole charge of forward formula, including the distribution of resin, filler and additives, is an important factor affecting the powder rate in spraying.
3. Materials
The powder coating is mainly composed of epoxy resin, polyester resin and other polymer compounds. These compounds have high dielectric constant, so the effect of electric field force in the electric field is strong. If only pure resin is used in the formula, the powder loading rate is good. However, due to the high price and cost, this method is generally not used. In order to meet the demand of market competition, powder manufacturers can reduce the material cost, add fillers, control the suitable pigment to base ratio, and add fillers with fine particle size. In the test, such as ultra-fine barium sulfate, the powder loading rate in dead corner can be improved.
4. Charged additives
Silver plating powder
Powder coating manufacturers are mostly through adding charged additives in the powder formula to complete the progress of powder rate on the dead corner of powder. Generally add metal powder, micro powder larger than surface area, etc.
The results show that the normal distribution of powder particle size is concentrated and the peak value is suitable. However, the particle size itself is very fine and its fluidity is very weak, which is not conducive to the electrification of the powder and affects the powder loading rate at the dead corner of the powder. In addition, it can participate in fumed silica or fine alumina powder during extrusion and comminution. Be able to use forward powder electrification and add powder fluidity.
5. Relationship between particle size and powder loading rate in dead corner
Most of the materials of powder coatings are high insulation functional materials. Once the powder particles with certain particle size are electrified, it is difficult to disappear, and the resistivity of the powder is also large.
Source: Jiangmen spraying equipment manufacturer
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07-22
Preparation and routine maintenance before using coating equipment
Before coating construction, the operator should know what preparation and daily protection should be done, otherwise the equipment will be damaged. Preparation before painting Before the coating
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How to deal with the phenomenon that powder coating does not produce powder
1、 There are other impurities in the powder coating 2、 If the spray gun and powder feeder are not cleaned up for a long time, there is powder sticking on the nozzle end, and the powder outlet of the spray gun is blocked by the loose head 3、 The powder itself is damp and caking 4、 During construction, the air pressure is too low 5、 The solenoid valve doesn't work and there is no powder injection pressure output 6、 The powder conveying pipe connecting the spray gun is bent and may fa
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07-22
Characteristics of Jiangmen spraying equipment
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07-22
Advantages of Jiangmen powder coatings
1. Excellent film function The coating has metallic luster, brilliant multicolor effect and outstanding protection function, which provides colorful appearance decoration for industrial products su