If you don't know how to distinguish the quality of spray powder, you can try the following methods.
Method one is to see appearance of powder.
1. Grasp a handful of powder in your hand. The more smooth and loose the powder is, the better the quality is. On the contrary, the powder is rough, feels heavy and the quality is poor. It is not easy to spray, there are many secondary powder drops and great waste.
2. The larger the volume, the less filler in powder spraying coating, the higher the cost and the better the quality; The smaller the volume, the higher the filler in the powder spraying 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 powder cannot be stored for a long time, and the leveling and other effects of poor powder become worse after 3 months. The shelf life of normal powder is 12 months at room temperature. Poor raw materials are used to produce powder. The sprayed surface will accelerate pulverization and aging after half a year.
The second method is spray area identification method.
The resin content of powder with normal spraying area shall be about 55-65%, and the resin shall be about 20 yuan / kg.
Comparison method: two identical powders are sprayed with the same product, depending on the area of the powder sprayed product, the one with less spraying area is poor, and the use cost is high. For manufacturers, the spraying area is small and the use cost is high. It is recommended to use genuine powder from the manufacturer.
The third method is spray identification.
The powder with good powder loading rate and efficiency is easy to spray. The substrate can be covered by spraying 1-3 guns. There is less secondary recovery powder and high efficiency. Poor powder is not good for powder application. The substrate can be covered only by spraying 3-5 guns. There are many secondary recovery powders and low efficiency. Operators can determine the amount of powder falling by spraying the powder rate. Less products are produced at the same time, more secondary recovery powder, increasing the burden of operators and low efficiency.
The fourth method is baking recognition.
Good powder does not produce a lot of smoke during baking. Poor powder produces a lot of smoke during baking.
The fifth method is to identify the appearance and luster of finished products after baking.
Good powder products have fine, full, transparent and three-dimensional appearance, and can maintain relative luster for a long time. Poor powder products have dull and rigid appearance, foggy and opaque surface, and poor three-dimensional feeling.
The sixth method is adhesion and aging identification.
Good powder has strong adhesion and toughness, and can keep it from pulverization and aging for several years. Poor adhesion and aging begin in a short time after poor powder spraying, and the product is easy to age, pulverize, rust, etc
The seventh is the high temperature identification method.
Adjust the temperature to 220-230 ℃ and keep it for 10-15 minutes. The good powder has better temperature and weather resistance. After high temperature baking, the color change is small and the luster changes little. Poor powder, poor temperature and weather resistance, serious discoloration and dull luster after high temperature baking.
If you want to know more about spraying coat powder or spray welding powder, you can search online wococarbide. Wococarbide Provide various products and technical questions and answers.
热门资讯
