With the development and growth of powder coating, the market demand increases, and the quality of powder coating begins to vary. So how should we distinguish the quality of powder coating?
1. Operation identification method of spraying personnel: powder loading rate
The powder Ji with good powder loading rate is easy to spray, and the base material can be covered by spraying 1-3 guns, with less secondary recovery powder and high efficiency. Poor powder is not good for powder application. Only spray 3-5 guns can cover the base material. There are many powder recycled and low efficiency. The operator can determine the powder rate by spraying, and the amount of powder dropped is not much. At the same time, the output of products is less, the secondary recovery of powder is more, the burden of operators is increased, and the efficiency is low.
The quality of low-end raw materials is unstable and easy to deteriorate. Use poor raw materials to produce powder, spray surface after half a year to accelerate powder, aging. In addition, the poor powder is not easy to store, resulting in a large waste of powder and a large fee.
Good powder hand induction for silky smooth, Pengsong, floating. Bad powder feels rough, heavy and heavy. Grasp a handful of powder in hand, the smoother the powder is, the better the quality is. On the contrary, the rough handle of the powder is heavy, and the quality is poor. The powder with poor quality is not easy to spray, and there is much secondary powder falling, which leads to great waste.
The smaller the volume is, the higher the filler is, the lower the cost is and the worse the powder quality is. The larger the volume is, the less the filler is, the higher the cost is and the better the powder quality is. With the same weight, the big one is good powder, and the small one is poor powder. Poor powder is not easy to spray, more secondary powder falling, large waste, less coating area, high use cost.
3. Spray area identification method: spray area
The resin content of normal powder should be about 55-65%, the resin price is about 20 yuan / kg, and the filling material is about 2 yuan. Some poor powder factories use less than 45% resin content to replenish the inferior, increase the filler to reduce the cost and spray area.
Comparison method: two same powder spraying products, see which one has more powder spraying products, which one has less spraying products, and which one has less spraying products is poor, so the use cost is high. According to the calculation of 6 square meters per kilogram of powder spraying, one square meter less spraying is equivalent to 3-6 yuan more per kilogram of powder paid by the manufacturer. It is recommended to use the manufacturer's positive pin powder, and carefully check the actual use cost.
4. Baking identification method:
Baking identification is mainly to see if there is smoke. Good powder does not produce a lot of smoke during baking. Poor powder has a lot of smoke during baking.
5. Adhesion and aging identification method: adhesion and aging
Good powder adhesion, toughness, and can maintain a few years of non powder, aging. Poor powder adhesion is poor, very brittle, three months to six months after spraying began to aging, powdering. Contrast test adhesion and bending, and observe whether the product is aged and powdered after a few months. Poor adhesion and aging, easy aging, powdering, rusting, shortening the service life of the product.