[China Aluminum Industry Network] 1. Appearance Identification Method
(1) Feel: The hand-sensing is silky smooth, loose and floating. Grasping a handful of powder in the hand, the smoother the powder is, the better the quality is. On the contrary, the powder has a rough feel, poor quality, is not easy to be sprayed, and has a large amount of waste.
(2) Volume: The larger the volume, the less filler in the powder coating, the higher the cost, and the better the powder quality. The smaller the volume, the higher the filler content in the powder coating, the lower the cost and the poorer the powder quality. The same carton, which one's powder is bulky, is a good powder, which is a small size, is the poor powder.
(3) Storage time: A good powder can be stored for a long time, the powder leveling and other effects are unchanged, poor powder can not be stored for a long time, poor powder leveling deteriorates after 3 months and other effects become worse. The normal powder has a shelf life of 12 months at room temperature. The use of low-end raw materials has unstable product quality and is susceptible to deterioration. The use of poor raw materials produces powder. After six months, the sprayed surface will accelerate powdering, aging, and affect customer reputation. In addition, the powder is not easy to store, causing large waste of powder to the customer, and much scrapped.
2, spraying area identification method
The normal powder resin content should be about 55-65%, the resin is about 12-15 yuan/KG, the filler is about 2 yuan, and some bad powder plants use less than 45% of the resin content to shoddy , increase the filler to reduce costs and reduce the spraying area.
Contrast method: Two identical powders spray the same product. Which one has more powder spray products, which one has fewer spraying products, and less spraying products are worse, for the use of manufacturers, the spraying area is small, and the use cost is high. , According to the calculation of each square kilogram of powder spraying 6 square, each less one square of spray, equivalent to manufacturers pay more than 3-6 yuan per kilogram of powder, it is recommended to use manufacturers with genuine powder, carefully calculate their actual use costs.
3, spraying staff work efficiency
Good powder is easy to spray, spray 1-3 guns can cover the substrate, less secondary recycling powder, high work efficiency, poor powder is not good on the powder, spray 3-5 gun can cover the substrate , The secondary recovery of powder and more work efficiency, the operator can spray through the powder rate, the powder fell more than a small number to determine that at the same time less output products, more secondary recovery of powder, increase the burden on operators, low efficiency .
4, baking identification method
A good powder does not produce a large amount of smoke during the baking process. The poor powder has a large amount of smoke during the baking process. Some manufacturers take the raw materials to fill the materials, the powder dosage will increase, the square number will not be sprayed, increase the use cost, and the same quantity of powder will produce less product.
5, finished appearance and gloss identification after baking
Compared to observing the appearance of the two plates, the appearance of the good powder product is fine, full, transparent and three-dimensional. The poor powder product has a dull appearance and is dull, and the surface is hazy, impenetrable and has a poor three-dimensional appearance. The gloss of a good gloss is good, the gloss can be maintained for a long time, and the poor glossiness of the powder is good when it is baked out. In a few months, the light is started, and the material with poor gloss appearance detection is powdered. Can not maintain the long-term stability of the gloss, appear light, powder, paint stripping and so on.
6, adhesion and aging identification method
Good powder adhesion, strong toughness, and can maintain a few years of no powdering, aging, poor powder adhesion is poor, very brittle, 3 months to six months after spraying began to aging, chalking, contrast test adhesion And bending, and observation of the product after several months of aging, chalking, adhesion and poor aging, the product is easy to aging, powdering, rust, shorten the product life, affect customer reputation.
7, high pressure boiling water identification method
During the test, ensure that the air pressure is 0.1Mpa. During one hour or during the temperature increase process, remove the template and wipe the template immediately with suction paper to avoid water spots. The test plate coating should be free from blistering, discoloration, loss of light, water spots, Shedding phenomenon, foaming density Under normal vision, the surface of the board should not see obvious air bubbles, there is no obvious water spot on the board surface, there is no shedding range, and the water spot area should be controlled to be less than or equal to 3mm. High light retention rate is greater than or equal to 80%, flat and low light retention rate is greater than or equal to 85%, ordinary pink color difference ∆E is within 1.0 range, bright and special pink color difference ∆E is controlled within 1.5 range.
8, environmental identification method
Most of the good powder materials are produced by big manufacturers, environmental protection is guaranteed, poor materials and recycled powder, there is no way to ensure long-term environmental protection does not exceed the standard, environmental protection SGS test helps to identify the environmental quality of powder coatings.
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