In the pre-treatment section or workshop of the coating production line, the first thing to pay attention to is to develop the necessary system for the purchase, transportation, storage and use of strong acid and alkali, to provide workers with the necessary protective clothing, safe and reliable handling, handling and configuration equipment, and Formulate emergency measures and rescue methods in the event of an accident. Secondly, in the pre-treatment section of the coating production line, since there are a certain amount of waste gas, waste liquid and other three waste materials, it is necessary to arrange the exhaust gas exhaust, liquid discharge and three waste treatment devices in terms of environmental protection measures.
The quality of the pre-treated workpieces is different due to the different process flow of the pre-treatment liquid and the coating production line. To deal with better workpieces, the surface oil and rust are exhausted. In order to prevent rusting in a short time, it is generally necessary to carry out phosphating or passivation treatment in several processes after pretreatment: before the dusting, the phosphorus should be added. The workpiece is dried to remove moisture from its surface. Small batch production, usually dry, dried, and air dried. For large-scale flow operations, low-temperature drying is generally adopted, and an oven or a drying tunnel is used.
(1) Tissue production of dust spray coating For small batches of workpieces, manual dusting devices are generally used, and for large batches of workpieces, manual or automatic dusting devices are generally used. Whether it is manual dusting or automatic dusting, it is very important to keep the quality off. It is necessary to ensure that the sprayed workpiece has uniform powder and uniform thickness, and prevents defects such as thin spray, leakage spray, and rubbing.
In the process of coating production line, attention should also be paid to the hook part of the workpiece. Before entering the curing, the powder adhering to it should be blown off as much as possible to prevent the excess powder on the hook from solidifying, and some remove the residual powder before curing. In case of difficulty, the cured film on the hook should be peeled off in time to ensure that the hook is well conductive, so that the next batch of workpieces is easy to be powdered.
(2) Coating line curing process Production management This process should pay attention to the following items: sprayed workpiece, if it is a small batch of single-piece production, pay attention to prevent the powder from falling before entering the curing furnace, if there is dusting phenomenon, it should be timely Make up the powder. Strict process, temperature and time control during baking, pay attention to prevent chromatic aberration, over-bake or too short time to cause insufficient curing.
For large-volume automatic conveying of the workpiece, it is also necessary to carefully check whether it is leaking, spraying or partial dusting before entering the drying tunnel. If unqualified parts are found, it should be closed to prevent entering the drying tunnel and remove the heavy spray as much as possible. If individual workpieces fail due to thin spray, they can be re-sprayed and solidified after curing out of the drying tunnel
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