一. Appearance identification method:
1. Grasp the powder in your hand, the smoother and looser the powder, the better the quality. On the other hand, the rough powder feels heavy and the quality is poor. It is not easy to spray, there are many secondary powder drops, and waste is large.
2. The larger the volume, the less filler in the powder spray coating, the higher the cost and the better the quality; the smaller the volume, the higher the filler in the powder spray coating, the lower the cost. The worse the quality.
3. The powder with good storage time can be stored for a long time, and the powder leveling and other effects remain unchanged. The poor powder cannot be stored for a long time, and the poor powder has worse leveling and other effects after 3 months. The normal powder has a shelf life of 12 months at room temperature. The powder is produced using poor raw materials. The sprayed surface will accelerate powdering and aging after half a year.
二, spray area identification method:
The resin content of the powder with a normal spray area should be about 55-65%, and the resin should be about 20 yuan / KG.
Comparison method: two sprays of the same product of the same kind of powder, depending on the area of the powder sprayed product, the sprayed area is small, the cost is high. For the manufacturer, the spraying area is small, and the use cost is high. It is recommended to use genuine powder for manufacturers.
三, sprayer job identification method:
The powder loading rate and high efficiency powder are easy to spray, and the substrate can be covered by spraying 1-3 guns. The secondary recycling powder is less and the efficiency is high. Poor powder is not good for powder coating. Only spray 3-5 guns to cover the substrate. There are many secondary powders to be recovered and the efficiency is low. Operators can apply powder rate by spraying, and the amount of powder falling is not much. At the same time, fewer products are produced and more secondary powder is recycled, which increases the burden on operators and low efficiency.
四, baking identification method:
Good powder does not produce a lot of smoke during the baking process. Poor powder generates a large amount of smoke during the baking process.
五. Appearance and gloss identification of finished products after baking:
Good powder products have a delicate appearance, fullness, transparency, strong three-dimensional sense, and can maintain relative gloss for a long time. Poor powder products have dull appearance, dull appearance, foggy surface, imperviousness, and poor three-dimensional effect.
六, adhesion and aging identification method:
Good powder has strong adhesion, strong toughness, and can be kept from pulverization and aging for several years. Poor adhesion and aging in a short period of time after powder spraying, the product is prone to aging, chalking, rust, etc.
七, high temperature identification method:
Adjust the temperature to 220-230 degrees and keep it for 10-15 minutes. A good powder has better temperature and weather resistance. After baking at high temperature, the color becomes smaller and the gloss does not change much. Poor powder, poor temperature and weather resistance, severe discoloration and matte gloss after baking at high temperature.
