Why is the coating thickness related to the success or failure of the coating process?
Publish in：2024-09-29 17:01:50 Browse (239)
Memo：For the coating construction, the thickness of the coating film is the most important control factor in the coating process, and its significance is:
For the coating construction, the thickness of the coating film is the most important control factor in the coating process, and its significance is:
(1) To prevent coating defects caused by inappropriate film thickness. According to experience, more than half of the appearance defects of the coating in field production are caused by improper control of the thickness of the paint layer. Some common coating defects such as flow hanging, thin paint layer, dew bottom color, etc., are directly related to the loss of film thickness control, and some defects are also indirectly related to this. For example, the bumper spray of the first layer of adhesive bottom paint film thickness is not enough, will lead to the entire coating adhesion decline, while the film thickness of the primer can not meet the requirements of its conductive effect will also decline, which will cause the first color paint to use electrostatic spraying paint transfer rate decline, and finally lead to insufficient color paint.
(2) Help to adjust the appearance index. Common paint film appearance indicators such as gloss, color difference, orange peel, DOI, etc., need to be based on film thickness control. The above indicators are obviously affected by the film thickness, especially the surface paint film thickness, therefore, in the entire coating quality control, the film thickness as the most important control factor is necessary.
(3) Cost control. In addition to the quality cost reflected in the impact of film thickness control on the quality of painting, about half of the main cost of painting is occupied by paint. Accurate film thickness control is not only conducive to the stability of coating quality, but also conducive to the saving of paint.
(1) To prevent coating defects caused by inappropriate film thickness. According to experience, more than half of the appearance defects of the coating in field production are caused by improper control of the thickness of the paint layer. Some common coating defects such as flow hanging, thin paint layer, dew bottom color, etc., are directly related to the loss of film thickness control, and some defects are also indirectly related to this. For example, the bumper spray of the first layer of adhesive bottom paint film thickness is not enough, will lead to the entire coating adhesion decline, while the film thickness of the primer can not meet the requirements of its conductive effect will also decline, which will cause the first color paint to use electrostatic spraying paint transfer rate decline, and finally lead to insufficient color paint.
(2) Help to adjust the appearance index. Common paint film appearance indicators such as gloss, color difference, orange peel, DOI, etc., need to be based on film thickness control. The above indicators are obviously affected by the film thickness, especially the surface paint film thickness, therefore, in the entire coating quality control, the film thickness as the most important control factor is necessary.
(3) Cost control. In addition to the quality cost reflected in the impact of film thickness control on the quality of painting, about half of the main cost of painting is occupied by paint. Accurate film thickness control is not only conducive to the stability of coating quality, but also conducive to the saving of paint.
Statistics show that when spraying with the same equipment, whether the film thickness is accurately controlled, the coating consumed is more than 25% different. At present, the robot spraying used in China is mainly Japanese Iwata or Mitsubishi robot, which is introduced earlier and has poor control accuracy; The new painting line generally uses ABB, FANUC, MOTOMAN, DURR and other multi-axis robots.
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