1. Appearance Identification Method:
1. Hand feel
Good powder hand sensing is silky smooth, fluffy, floating. Bad powder feels rough, heavy, and heavy. Grab a handful of powder in your hand, the smoother and looser the powder, the better the quality, on the contrary, the powder is rough and heavy, and the quality is poor. Poor quality powder is not easy to spray, and there is a lot of secondary powder and a lot of waste.
2. Volume
The larger the volume, the less filler in the powder coating coating, the higher the cost, and the better the powder quality. The smaller the volume, the higher the filler in the powder coating coating, the lower the cost, and the worse the powder quality. With the same weight, the large volume is a good powder, and the small volume is a bad powder. Poor powder is not easy to spray, there is more secondary powdering, large waste, less coating area, and high use cost.
3. Storage time
Good powders can be stored for a long time, and the powder leveling and other effects remain unchanged. Poor powder can not be stored for a long time, and the leveling of poor powder deteriorates after 3 months and other effects deteriorate. The shelf life of normal powder is 12 months at room temperature, and the quality of low-end raw materials is unstable and easy to deteriorate. Poor raw materials are used to produce powder, and the sprayed surface accelerates pulverization and aging after half a year. In addition, the poor powder is not easy to store, resulting in large waste of powder and a lot of fees.
2. Spraying personnel operation identification method: powder rate
The powder with good powder rate is very easy to spray, and the substrate can be covered by spraying 1-3 guns, and the secondary recovery powder is less and the efficiency is high. Poor powder is not easy to powder, spray 3-5 guns to cover the substrate, secondary recovery powder is more, low efficiency. The operator can determine the amount of powder that has fallen by spraying the powder rate. The output of products at the same time is less, and the secondary recovery powder is more, which increases the burden on operators and has low efficiency.
3. Baking identification method: whether there is smoke produced
A good powder does not produce a large amount of smoke during the baking process. Poor powders produce a lot of smoke during the baking process.
4. Appearance and gloss identification method of finished product after baking: appearance after baking
After good powder baking, the appearance of the product is delicate, full, transparent, three-dimensional, and can maintain relative luster for a long time. After poor powder baking, the appearance of the product is dull, dull, the surface is foggy, not transparent, the three-dimensional sense is poor, and the gloss is good when it is just baked, but it can not maintain long-term gloss stability, and after a period of time, there is a loss of light, chalking, paint stripping and other phenomena.
5. Adhesion and aging identification method: adhesion and aging
Good powder adhesion is strong, tough, and can be kept for several years without chalking and aging. Poor powder adhesion is poor, very brittle, and begins to age and pulverize three months to half a year after spraying. Comparative test of adhesion and bending, as well as observation of the product after a few months of aging, chalking. Poor adhesion and aging, the product is easy to age, chalking, rusting, and shorten the service life of the product.
6. High temperature identification method: high temperature
Adjust the temperature to between 220-230 degrees, keep warm for 10-15 minutes, good powder, temperature resistance and weather resistance are better, the color changes less after high temperature baking, and the gloss changes little. Poor powder, poor temperature and weather resistance, serious discoloration after high temperature baking, gloss and matte. This method is particularly effective for detecting outdoor light-colored powders. Poor powder uses poor resin, titanium dioxide, poor pigments and fillers, temperature resistance and weather resistance. Low cost, shoddy.
