1. Hold a handful of powder in your hand, the smoother the powder will be, and the quality will be better. On the contrary, the powder will feel rough and feel heavy and the quality will be poor. It is not easy to spray, and there is a lot of secondary powder falling, and the waste is large.
2. The larger the volume, the less the 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 and 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. Poor powders cannot be stored for a long time. Poor powders will have poor leveling and other effects after 3 months. Normal powder has a shelf life of 12 months at room temperature. Using poor raw materials to produce powder, the sprayed surface will accelerate pulverization and aging after half a year.
二. The spraying area identification method:
The resin content of the normal powder in the spray area should be about 55-65%, and the resin is about 20 yuan/KG.
Contrast method: spray the same product with two powders of the same kind, depending on the area of the powder sprayed product, if the sprayed area is small, it is poor, and the use cost is high. For the manufacturer, the spraying area is small, and the use cost is high. It is recommended to use the manufacturer's genuine powder.
三, Spraying personnel job identification method:
Powder loading rate, high efficiency powder is easy to spray, spray 1-3 guns can cover the substrate, less secondary recovery powder, high efficiency. Poor powder is not easy to powder, spray 3-5 guns to cover the substrate, the secondary recovery of powder is too much, and the efficiency is low. Operators can determine whether there is too much powder falling by spraying powder rate. At the same time, the output of products is small, and the secondary recycled powder is large, which increases the burden on the operators and is low in efficiency.
四, Baking identification method:
Good powder does not produce a lot of smoke during the baking process. Poor powder produces a lot of smoke during the baking process.
五. Appearance and gloss identification method of finished product after baking:
Good powder products have fine appearance, fullness, transparency, strong three-dimensional effect, and can maintain relative gloss for a long time. Poor powder products look dull, dull, foggy, impervious, and have poor three-dimensionality.
六. Adhesion and aging identification method:
Good powder has strong adhesion, strong toughness, and can keep it from powdering and aging for several years. Poor powder coating starts to have poor adhesion and aging in a short time, and the product is easy to age, chalk, rust, etc.
七, High temperature recognition method:
Adjust the temperature to between 220-230 degrees and keep it for 10-15 minutes. A good powder has better temperature and weather resistance. After high-temperature baking, the color changes less and the gloss changes little. Poor powder, poor temperature and weather resistance, serious discoloration and dull gloss after high-temperature baking.
