Application of spraying powder in the production p

Application of spray powder in can making production process II

this process is realized through a series of solenoid valve control. The solenoid control valve of powder pump controls the dosage of powder required for the part of the workpiece to be coated. When the powder pump sends the powder out of the powder conveying hose and blows through the industrial use of the pangolin wire rod, including the support, gear and protective cover, the powder is accelerated by the amplifier, and the uniformity of the powder or gas is optimized through an atomizing nozzle. After entering the control tube, the powder particles in the tube are statically charged by contacting the control tube wall. The charged powder is coated on the can body or can cover workpiece through the nozzle of the spray gun. The pump is shut down and the air flow diverter is opened. Shut down the spray gun, and each can body or can cover workpiece repeats this cycle operation

the operation cycle speed of a single piece depends on the amount of powder to be coated on each piece. For example, for the post repair of epoxy coated tank covers, each spray gun can handle 300 to 350 pieces per minute. When the tank cover is placed in front of the spray gun through a set of positioning mechanism, this friction charged spray gun will spray powder with electrostatic charge to the tank cover. All over sprayed powder will gather and re enter the feeding hose and enter the system for recycling, and then the coated tank cover will be transported by conveyor belt through a curing oven, where the powder melts and flows into the scratch part and welding area of the workpiece

this process can be applied to both the outer side and the inner side of the tank cover, and the coating amount is generally 60 to 80 mg. In order to increase the appearance quality of the outer side of the tank cover, a larger amount of powder is required. For the powder coating on the inner side of the three piece can body, a new powder coating process has been developed, which is accurate and reliable. The maximum coating speed of this coating process is about 75 single pieces per minute per spray gun. The open end of the tank is transferred by the positioning transmission mechanism to the front of the friction electrification spray gun, and the charged powder is sprayed into the tank. At the same time, any overspray powder is recycled by the device and re entered the system for recycling. Then the tank is sent to the flat belt conveyor oven for roasting and solidification. The roasting time is about 2 minutes at 425f. In terms of general international standards, the coating generally adopts modified epoxy powder with an average accuracy grade of 10 to 15 microns, while the canned coating film meeting the sanitary grade is about 15 to 20 microns. Thus, can manufacturers can obtain excellent coating quality, eliminate the volatilization of organic compounds of workpieces, and the utilization rate of materials can be as high as 99%. Due to the clean and effective coating process, the cleaning and maintenance costs of workpieces can be greatly reduced

like canning factories, food packaging manufacturers can benefit from the coating process of the end of materials. Due to the excellent quality of the improved canning coating and the fact that the powder coating improves the storage life of food, the impact of leakage, corrosion and iron odor on canned food is minimized, that is, the powder coating provides an excellent protective film between food and packaging containers, thereby improving the quality of canning factory products Life

powder coated canned products have longer storage life. In the field of various foods and canned products with different specifications, powder coated metal cans can completely replace the canning method treated with liquid paint

at present, the relevant manufacturers are gradually improving the powder coating materials and processes required for food canning, so as to meet the requirements of good surface quality of cold plate more suitable for food canning

now, powder and raw material manufacturers need to develop more types of resin products. At present, there is not enough research on a variety of resins and additives that can be used to improve powder properties and help overcome powder coating defects

powder manufacturers also need to understand that the entire potential metal cannon has repeatedly tested on its laboratory R & D equipment to accurately debug the coating parameters of the equipment, and determine which coating technology has more practical value. Whether it is three piece cans, spray cans, can sealing covers, can making plates or coiled materials, each material needs to be coated with different resin modified powders to obtain the best performance

spray cans need inner wall coating with anti atomization ability, while three piece food cans must have anti-corrosion ability to some foods and anti cooking ability at the same time. The change of performance depends on the change of composition in metal raw materials. For example, powder coated on tin cans with good performance may not be acceptable in aluminum cans

the clean, polished surface with high gloss formed by powder coating technology makes the quality of cans and containers more excellent, sanitary and eye-catching. These are selling points that attract customers' attention when buying, or the convenience of opening cans and recycling after rinsing

the packaging chamber of Commerce has greatly improved the quality of their products by adopting new and improved powder coated containers that meet environmental requirements and improve the quality of stored food