1) The compressed air pressure is insufficient. You can check the compressed air supply, clean the air filtration equipment, and increase the pressure appropriately.

2) The microporous plate is blocked. You can check whether the microporous plate is blocked by ultra-fine powder or oil stains or impurities in compressed air.

3) Powder can be stored in the powder supply bucket for a long time to absorb moisture. You can try increasing the air pressure for a long time to sulfurize the powder and remove moisture. If necessary, use clean tools to help stir it.

4) Powder clumping can be manually loosened and sieved.

5) If there is too much powder in the vulcanization bed, the amount of powder in the bed can be reduced. The amount of powder is generally added to two-thirds of the volume of the vulcanization bed.

Reasons and solutions for poor surface hardness of powder coatings after curing

1) Insufficient curing can be achieved by increasing the baking temperature to meet the process requirements or extending the baking time of the workpiece to meet the process requirements.

2) Excessive curing and coating embrittlement can also lead to a decrease in hardness. It is advisable to lower the baking temperature and shorten the baking time appropriately.

3) The heating rate of baking is too slow. During the slow melting flow process, some leveling agents migrate to the surface, which can increase the heating rate to the surface of the coating.

4) If there are quality issues with the powder itself, the powder supplier can be notified to improve the formula.

Reasons and solutions for discoloration of powder coating after curing

1) If the baking time is too long, it can be shortened.

2) If the baking temperature is too high, the baking temperature can be lowered.

3) The coating thickness is uneven.

a) The position or direction of the spray gun is incorrect and may be affected by Faraday effect. The spray gun should be checked and reset;

b) The vibrator of the automatic spray gun does not match the speed of the production line. The production line speed should be adjusted or the stroke of the spray gun vibrator should be adjusted;

c) The airflow in the powder spraying room affects the spraying range of the powder, and the equipment supplier should be contacted;

d) The powder output of the spray gun is uneven. The powder supply and spray gun system should be checked to ensure uniform powder vulcanization and atomization;

e) High voltage instability should be checked for output voltage.

4) The air in the oven is not clean, and the air heating system and exhaust should be checked.

5) There is a problem with the powder formula, and the powder supplier should be contacted.

The above is all the content shared by Yongji Industrial, a powder coating manufacturer.