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    Home > Coatings News > Paints and Coatings Market > Effect of mount defects on coating quality

    Effect of mount defects on coating quality

    • Last Update: 2020-11-12
    • Source: Internet
    • Author: User
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    Hangings in a broad sense include hangings, hooks, bays, baskets, etc. For static coating of paints and powders, the work pieces should be attached to the pendant for pre-treatment and spraying and curing. Hanging fixtures are the carrier of coating work parts, which is indispensable in coating production

    . The effects of the hanger are as follows:
    of the hanger coating is thick, poor conductivity, resulting in a thin coating of the work parts.
    electrostitive spraying requires the receiving resistance of the work piece to be less than 1M, otherwise the powder can not be adsorbed to the work piece or adsorption thickness is insufficient, the curing coating is thin;
    way to overcome this defect is to clean up the hanging point and, if necessary, clean the entire hanger; Hanging point cleaning is the daily maintenance work, with pliers, grinding machine and other tools simple and fast, to clean to reveal the metal substate of the hanging gear. Hanging point conductive good, can meet the needs of spraying, but when the overall thick, the hanging tool appears clumsy, which requires the overall deplastication. There are three methods of deplasticization: manual knocking, low efficiency, poor effect, solvent immersion, deplagation clean, fast, but solvent contains volatile components, and halogenated hydrocarbons, swelling off the coating treatment is not yet an ideal method; Hanging bad ground, not only affect the thickness of the coating, at high voltage will also produce electrical sparks, there is a solvent volatile electrostectant spray more harmful, is a major safety hazard. The conductive capacity of the hanger should be increased by design, and the plasticity should be deplasticated in time.
    hanging caused by local coating thin there are two cases, one is the spray surface closer to the pendant caused by the hanging and work piece snatching powder (paint) phenomenon, need to increase the distance between the two to solve;
    surface rust after depainting (plastic) and peeling off the paint skin caused by impurities particles on the coating surface.
    in order to maintain the conductivity of the hanger, the hanger should be periodically deplasticated. No matter what kind of deplastication method, the deplasticized hanger will more or less residual oxidizing skin, lacquer skin, resulting in the quality of coating surface impurities.
    most cases, the first measure people take when an impurity appears in the coating is to clean the cured oven, or even to clean it once a week, without studying the source of impurities in the oven. In fact, the impurities in the oven come from two sources: smaller, lighter dust, wool from the air, and the size of the impurities brought by the hanger, from the coating surface particle size analysis, can be determined whether it comes from the powder itself. For the oven of the forced hot air cycle, the lacquer skin and rust collapse at the curing temperature, and with the circulation hot air pollution curing environment, resulting in particle defects, so to ensure the cleaning of the post-plastic hanger is an important measure to prevent coating acrobatics. Check that the hanger is clean by visual or perturnation.
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