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    Home > Coatings News > Paints and Coatings Market > How to control the thickness of the electrostectrectrectrative powder coating

    How to control the thickness of the electrostectrectrectrative powder coating

    • Last Update: 2020-11-23
    • Source: Internet
    • Author: User
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     Spray profile color is diverse, by the majority of customers love, but due to the complexity of aluminum profile section shape, spray production and coating thickness inspection has brought a certain degree of
    difficulty. Regardless of the shape of the aluminum profile, the coating of its decorative surface minimum local film thickness ≥40um, which is GB5237.4-2008 mandatory implementation provisions, must be strictly
    grid to comply with the implementation;
    in actual production, due to electrostectrical spraying equipment and aluminum profile section shape, the accurate control of coating thickness is a certain degree of attention . Spraying
    the characteristics of the coating production line, from the following aspects to better control the thickness of the coating.
    1. Hanging method
    according to the shape of aluminum profile to choose the appropriate hanging, choose the correct hanging method is the key to control the thickness of the coating, it can not only improve the quality of aluminum profile coating, but also
    to reduce the powder room operator hand-replenished gun powder workload, especially the hanging material spacing can adjust the thickness of the powder coating, the spacing of the hanging material is generally required: aluminum profile
    width of aluminum profile.
    2. Workware and hanger contact
    Due to the workware and pendant contact (i.e. poor conductivity), will seriously affect the coating efficiency and the quality of the coating
    , resulting in low powder rate on the workware and cause the coating film thickness is low or even exposed to the bottom of the phenomenon, and to the recovery system caused a lot of pressure, so that excess powder can not be recycled and overflowed outside the powder room, both reduce the utilization rate of powder and pollution of the
    environment.
    the product produced when the work parts are not in contact, the thickness of the coating measured at different points on the same material may vary by 30um-70um, in some places because the coating is too thick,
    will have defects such as orange peel, pinholes, fluid marks, color and gloss will also be affected, and in natural light to visually detect the sand pattern powder profile has a more obvious zebra line and other missing
    traps. Therefore, good conductivity between the workware and the pendant must be ensured.
    3. Transport chain speed and production process
    in the production of the speed of the conveying chain and the production process on the thickness of the powder coating plays a major role, such as: lift stroke, gun distance, powder pressure, electrostation voltage
    , etc. , the height of lift travel is generally required: travel height - work height of 200mm. The more complex the shape of the work piece, the closer the spray gun and the work piece is, the smaller the amount of powder required
    , the lower the voltage;
    4. Hand spray gun powder way
    Due to the complexity of aluminum profile section shape, in the production process, as the inner corner of the decorative surface, cross ditches, grooves, etc. are not easy to spray the place of automatic spray gun, hand spray
    gun re-spray, when hand spray gun The nozzle against the work piece to be resquisitioned place, transmission pressure adjustment is too large, hand spray gun and work piece is too close, easy to cause the surface of the work piece
    In general, when the nozzle of the hand spray gun is lying on the place to be sprayed on the work piece, the transmission pressure is
    :1.2 to 1.8 bar, and the distance between the hand-replenished gun and the work piece should be controlled at 80 to 150mm.
    5. Powder pump factors
    in the production process common powder is mainly caused by the wenqiuli powder pump parts are not clean, due to the powder pump pressed suction tube, easy to produce powder, sticky powder and cause blockage
    , will lead to the powder pipe reception force affected, thus affecting the coating thickness of the work piece, in general, the powder room operator should timely check the Wenciuri powder pump parts of the
    cleanliness.
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