The control of the coating quality of color-coated plates is usually divided into three stages. Including pre-coating control, coating construction process and post-coating control according to the failure degree of the coating. Among them, the control before coating and during construction is relatively important. The quality control after coating is actually the result feedback of the first two, and it is a means of finding the cause of quality defects. Therefore, when operating the entire construction process, strict process regulations and operations are required.
Before coating, it is necessary to check the test and analysis of surface defects and plate shape, the degreasing and cleaning effect of the steel strip surface, the thickness of the chemical liquid film, the temperature and humidity of the coated substrate surface, etc. During the coating construction process, attention should be paid to the wet film thickness of the primer and top coat, whether there is leakage, and the temperature control of each section of the curing furnace. Inspect the surface condition after coating, including imperfections, gloss, total dry film thickness, adhesion, and other indicators of treatment.
For the laboratory technician responsible for coating quality control, it is not only necessary to keep the laboratory clean, but also the instruments and measuring tools used in the laboratory, especially the color difference meter, artificial aging machine, gloss meter, etc., must be shockproof, dustproof, corrosion-proof and Check regularly. Chemicals need to be visited according to regulations, and laboratory analysts also need to be responsible for data and conclusions.
The inspection equipment for general color-coated plate coating quality control includes:
1. Thermometer
2. Hygrometer
3. Surface profiler or comparator;
4. Paint Viscometer
5. Wet Film Thickness Gauge, dry Film Thickness Gauge
6. Coating gloss and color inspection equipment
7. Adhesion Tester
8. T-bend Tester
9. Impact Tester
10. Pencil Hardness Tester
