{"id":7627,"date":"2022-12-27T13:26:51","date_gmt":"2022-12-27T09:56:51","guid":{"rendered":"https:\/\/ranginkimia.com\/fa\/problems-related-to-the-appearance-of-the-powder-coating-surface-and-investigating-their-factors\/"},"modified":"2023-06-01T15:59:29","modified_gmt":"2023-06-01T12:29:29","slug":"problems-related-to-the-appearance-of-the-powder-coating-surface-and-investigating-their-factors","status":"publish","type":"post","link":"https:\/\/ranginkimia.com\/fa\/problems-related-to-the-appearance-of-the-powder-coating-surface-and-investigating-their-factors\/?lang=en","title":{"rendered":"Problems related to the appearance of the powder coating surface and investigating their factors"},"content":{"rendered":"\t\t
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<\/p>\n

Pinholing in the powder coating<\/strong><\/h4>\n
    \n
  1. Complete surface preparation is not done and oil and grease remains on the surface<\/li>\n
  2. Residues of surface preparation chemicals<\/li>\n
  3. Color incompatibility with other manufacturers’ powder coatings<\/li>\n
  4. The presence of water and oil in the feed and air of the compressor<\/li>\n
  5. Rust on the surface of the piece<\/li>\n<\/ol>\n

    <\/p>\n

    <\/p>\n

    \"\"<\/figure>\n

    <\/p>\n

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    \"\"<\/figure>\n

    <\/p>\n

    <\/p>\n

    <\/p>\n

    <\/p>\n

    Outgussing and craters<\/strong><\/h4>\n
      \n
    1. Incompatibility with other powder coating<\/li>\n
    2. Film thickness too high<\/li>\n
    3. High humidity of powder coating<\/li>\n
    4. Gas trapping and release<\/li>\n
    5. High porosity of the coating surface<\/li>\n
    6. Problem with powder coating formula<\/li>\n<\/ol>\n

      <\/p>\n

      <\/p>\n

      <\/p>\n

      <\/p>\n

      \"\"<\/figure>\n

      <\/p>\n

      <\/p>\n

      <\/p>\n

      <\/p>\n

      Says:<\/strong><\/h4>\n
        \n
      1. High thickness of the coating<\/li>\n
      2. Powder spillage and accumulation on the lower edges of the piece<\/li>\n
      3. Accumulation of powder inside the corners of the piece<\/li>\n
      4. High piece temperature<\/li>\n
      5. High curing temperature<\/li>\n<\/ol>\n

        <\/p>\n

        <\/p>\n

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        <\/p>\n

        \"\"<\/figure>\n

        <\/p>\n

        <\/p>\n

        \"\"<\/figure>\n

        <\/p>\n

        <\/p>\n

        Powder spitting and wavy:<\/strong><\/h4>\n
          \n
        1. High concentration of powder compared to spraying air<\/li>\n
        2. Long or twisted powder hose or large hose diameter<\/li>\n
        3. Presence of moisture in powder coating<\/li>\n
        4. Pouring powder from the cabin and hangers on the surface of the piece<\/li>\n
        5. Wear of sprayer parts<\/li>\n
        6. Soft granulation of powder coating<\/li>\n
        7. Air pressure changes in the powder coating spraying system<\/li>\n<\/ol>\n

          \u00a0<\/p>\n

          Granulation of the coating surface (highness and contamination on the coated piece)<\/strong><\/h4>\n
            \n
          1. Fibers in cleaning wipes<\/li>\n
          2. The spray gun and hoses are not clean<\/li>\n
          3. Environmental dust pollution<\/li>\n
          4. Thinness of the final coating thickness<\/li>\n
          5. Mixing with other powder<\/li>\n<\/ol>\n

            <\/p>\n

            <\/p>\n

            \"\"<\/figure>\n

            <\/p>\n

            <\/p>\n

              \n
            1. Pollution caused by warehousing<\/li>\n
            2. Not properly polishing the surface of the piece, especially the cut parts<\/li>\n<\/ol>\n

              \u00a0<\/p>\n

              Orange peel:<\/strong><\/h4>\n
                \n
              1. Too high or too less film thickness<\/li>\n
              2. Low curing temperature<\/li>\n
              3. Wet color powder<\/li>\n
              4. Improper distribution of particle size<\/li>\n
              5. High air speed at the entrance of the furnace<\/li>\n
              6. Uneven thickness of the piece<\/li>\n
              7. High voltage<\/li>\n
              8. Lack of earth connection<\/li>\n<\/ol>\n

                <\/p>\n

                <\/p>\n

                <\/p>\n

                <\/p>\n

                \"\"<\/figure>\n

                <\/p>\n

                <\/p>\n

                \"\"<\/figure>\n

                <\/p>\n

                <\/p>\n

                Decreased color glossiness<\/strong><\/h4>\n
                  \n
                1. Mixing incompatible colors<\/li>\n
                2. Fast and high heating during cooking<\/li>\n
                3. Mixing coating with different resin bases<\/li>\n
                4. Water and oil pollution in compressor air<\/li>\n<\/ol>\n

                  \u00a0<\/p>\n

                  Increasing the glossiness of matte colors<\/strong><\/h4>\n
                    \n
                  1. Incomplete cooking in the oven<\/li>\n
                  2. Extreme changes in film thickness<\/li>\n<\/ol>\n

                    \u00a0<\/p>\n

                    Not blooming and smoothing leather and hammer colors<\/strong><\/h4>\n
                      \n
                    1. Low furnace temperature<\/li>\n
                    2. The high thickness of the piece and the color coating layer<\/li>\n
                    3. Color maintenance in non-standard conditions<\/li>\n
                    4. Mixing the powder of smooth colors in the tank<\/li>\n
                    5. Expiry date<\/li>\n
                    6. Incompatibility of new and recycled coating<\/li>\n<\/ol>\n

                      \u00a0<\/p>\n

                      Local accumulation of hammer and metallic flowers<\/strong><\/h4>\n
                        \n
                      1. Non-uniformity of heat in the furnace<\/li>\n
                      2. Imperfect earth connection<\/li>\n
                      3. Strong fluctuation in the voltage of the spraying device<\/li>\n
                      4. Lack of uniform color thickness<\/li>\n
                      5. Alloy and metal material of the piece<\/li>\n<\/ol>\n

                        \u00a0<\/p>\n

                        Color change in powder color<\/strong><\/h4>\n
                          \n
                        1. Variations in furnace firing temperature<\/li>\n
                        2. Low thickness of the coating layer<\/li>\n
                        3. High time for the coating to cook<\/li>\n
                        4. The presence of oil, water and chemical residues on the surface of the piece<\/li>\n
                        5. Change in the surface type of the part<\/li>\n
                        6. Contamination of the cabin and spray system and tank with previous coating<\/li>\n<\/ol>\n

                          \u00a0<\/p>\n

                          Weakness of coating in metallic color<\/strong><\/h4>\n
                            \n
                          1. Earth’s weakness<\/li>\n
                          2. Moisture of powder coating<\/li>\n
                          3. Incompatibility of new and recycled coating<\/li>\n<\/ol>\n

                            \u00a0<\/p>\n

                            Falling and not absorbing the powder into the piece<\/strong><\/h4>\n
                              \n
                            1. Long range of the gun<\/li>\n
                            2. Dense arrangement of parts near each other<\/li>\n
                            3. Low gun voltage<\/li>\n
                            4. Exhaustion of the spraying device<\/li>\n
                            5. High speed of conveyor line or spraying operator<\/li>\n
                            6. Coarseness of color grading<\/li>\n
                            7. The problem of spraying line connections<\/li>\n<\/ol>\n

                              \u00a0<\/p>\n

                              Soft and hard lumps in cartons<\/strong><\/h4>\n
                                \n
                              1. Lack of proper storage of powder coating (ambient temperature and humidity)<\/li>\n
                              2. Non-standard shipping conditions<\/li>\n<\/ol>\n

                                \u00a0<\/p>\n

                                Weak powder coating of corners and piece corners<\/strong><\/h4>\n
                                  \n
                                1. Increasing the air velocity in the spray gun<\/li>\n
                                2. High gun voltage<\/li>\n
                                3. High recycling of powder<\/li>\n<\/ol>\n

                                  4 Improper distance between the gun and the piece<\/p>\n

                                    \n
                                  1. Improper adjustment of the color concentration of the spray gun<\/li>\n
                                  2. Improper particle size distribution in powder coating<\/li>\n
                                  3. Weak earth connections<\/li>\n<\/ol>\n

                                    \u00a0<\/p>\n

                                    Poor fluidity of powder coating in tank or hopper<\/strong><\/h4>\n
                                      \n
                                    1. Existence of oil in the tank<\/li>\n
                                    2. Clogging of the porous plate<\/li>\n
                                    3. Not adjusting the wind pressure<\/li>\n
                                    4. The small size of the tank powder particles<\/li>\n
                                    5. Blockage of the air feeder<\/li>\n
                                    6. High humidity of powder coating<\/li>\n<\/ol>\n

                                      \u00a0<\/p>\n

                                      Production and collection: Rangin Kimia Industrial Complex<\/p>\n

                                      All rights of this article are reserved for Rangin Kimia.<\/p>\n

                                      <\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

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