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由于生产的连续性，彩涂板生产单位需要及时反映生产过程中工艺参数的变化，监控彩涂板的涂层厚度。一旦发现偏差，应立即进行调整，以确保生产过程稳定可控，从而降低制造成本，降低不良品或废品的概率，全面提高产品质量。
从理论上讲，彩涂板可采用以下三种方法在线检测彩涂板的漆膜厚度：首先，采用红外光谱吸收法检测漆膜厚度。其检测原理是根据有机涂料的特征元素官能团定量检测红外光谱，但不同颜色、不同涂料供应商提供的有机涂料的红外特征官能团不同，如果要准确检测涂层厚度，每个油漆供应商需要为每种颜色的油漆建立一个检测模型；对于用户来说，这意味着彩涂板至少需要建立500个红外探测工作模型，并且需要定期检查和维护工作模型。因此，红外光谱吸收法在线检测涂层厚度没有实际应用价值。其次，采用激光测厚在线检测系统。激光测厚的原理是通过控制激光光源在彩涂板上钻一个直径约为0.5mm的特定形状的小孔，然后用显微镜测量小孔斜率的长度，然后通过数学模型计算涂层厚度。这种方法是一种破坏性试验，它破坏了涂层的完整性，彩色涂层板的耐腐蚀性在使用过程中降低。第三，彩涂板采用涡流在线检测系统。这种方法不需要制作数百个检测模型或打孔。是一种比较有效的彩色涂布板涂层厚度在线检测系统；但检测系统为接触式检测，只有在机组停机时才能进行膜厚检测。因此，涡流在线检测系统的应用也受到限制，不能实现在线实时检测。
Due to the continuity of production, the color coated plate production unit needs to timely reflect the changes of process parameters in the production process and monitor the coating thickness of the color coated plate. Once any deviation is found, it shall be adjusted immediately to ensure that the production process is stable and controlled, so as to reduce the manufacturing cost, reduce the probability of defective or waste products and comprehensively improve the product quality.
In theory, the following three methods can be used for on-line detection of coating film thickness of color coated plate: first, the infrared spectrum absorption method is used to detect the coating film thickness. Its detection principle is to quantitatively detect the infrared spectrum according to the characteristic element functional groups of the organic coating, but the infrared characteristic functional groups of the organic coatings provided by different color and different coating suppliers are different, If you want to accurately detect the coating thickness, each paint supplier needs to establish a detection model for each color of paint; For users, this means that at least 500 infrared detection working models need to be established, and the working models need to be inspected and maintained regularly. Therefore, the on-line detection of coating film thickness by infrared spectral absorption method has no practical application value. Second, the laser thickness measurement on-line detection system is adopted. The principle of laser thickness measurement is to drill a small hole with a specific shape with a diameter of about 0.5mm on the color coated plate by controlling the laser light source, then measure the length of the small hole slope with a microscope, and then calculate the coating thickness through a mathematical model. This method is a destructive test, which destroys the integrity of the coating, The corrosion resistance of the color coated plate decreases during use. Third, the eddy current on-line detection system is adopted. This method does not need to make hundreds of detection models or punch holes. It is a relatively effective on-line detection system for coating thickness of color coated plate; However, the detection system is contact detection, and the film thickness detection can be implemented only when the unit is shut down. Therefore, the application of eddy current on-line detection system is also limited and can not implement on-line real-time detection.
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