Application of coating thickness gauge on plastic products
Measurement of coatings on plastic products. For example, when the ultrasonic method is used for measurement, there is often no good sound reflection surface due to the compatibility between the coating and the substrate, resulting in measurement failure or serious deviation of readings. If you use the wedge method to measure, there are many places where it is inconvenient to use and difficult to read. Humidity Sensor Probe , , Stainless Steel Electric Heating Tube PT100 Sensor , , Cast Aluminum Heater , Heating Ring Fluid Solenoid Valve
Therefore, manufacturers of portable electronic products generally use the transfer method to measure the coating on plastic products.
After many years of practice on the coating thickness gauge, we have summed up a set of methods, that is, first cover the product with a number of small strips of polyester film of standard thickness, and then press the two ends with paper-based masking tape, leaving the middle part. Put the product into the spraying line for normal spraying and baking.
After the product is finished, remove the polyester film with the paint film left, use an iron zero plate (or aluminum zero plate) as the substrate, and use a magnetic induction (or eddy current method) film thickness meter to measure the coated part and the uncoated part respectively. The difference between the two is the coating thickness. Since the same zero board is used, the reference point of electromagnetic induction will not change, thus ensuring the same measurement reference and accurate measurement. In addition, especially because of the difference method, the errors of the instrument and the zero plate will be canceled by subtraction. This greatly reduces the requirements on the zero plate and instrument accuracy.
There are also some factories that still use the method of pasting iron and aluminum sheets. It should be noted that the surface roughness, convex and concave deformation, and thickness changes of each iron or aluminum sheet will cause changes in the reference point of electromagnetic induction, which may result in increased measurement errors and poor repeatability. Need to be careful to avoid.
