Briefly describe the inspection methods and acceptance rules for each item of coating film quality of industrial products.
(1) Inspection of appearance quality and color
The inspection shall be carried out visually under natural scattered light and self-colored transmitted light without reflection. The illuminance of the light should not be lower than 300Lx (equivalent to the illuminance of the workpiece under inspection at a distance of 500mm under a 40W fluorescent lamp), and the distance between the workpiece and the naked eye is 350mm for observation and comparison. The color is compared with the standard color sample or Color Chart and the workpiece at the same distance for inspection.
The principle stipulates that all workpieces should be 100% inspected.
(2) Gloss inspection
Use a photoelectric gloss meter for inspection according to the provisions of GB/T1743-89. Due to the complex shape and different sizes of some workpieces, when it is impossible to directly use a photoelectric gloss meter for gloss inspection on the workpiece, it is possible to prepare a sample of the same material and process as the official product at the same time as the workpiece construction, and the coating is smooth and smooth. Similar to the workpiece being picked up, the gloss measured on the sample board is used to determine whether the gloss of the workpiece is qualified. The measured sample boards should not be less than 3, and each sample board should have no less than 3 inspection points, and the measured gloss of the 3 sample boards The gloss is basically similar to be considered qualified.
(3) Adhesion test
Since the adhesion test is a destructive test, it is not suitable for direct measurement on the product, and another sample should be made. The sample also needs to be made with the same material and the same process as the formal product. The final appearance quality of the sample coating should reach the same level as The official product is similar. The samples to be tested should be no less than 3 pieces, and the qualified products should be carried out according to the provisions of GB/T9286-88.
(4) Drying inspection
Press hard on the paint film with your fingers, and it is dry if no finger marks are left, or follow the regulations of GB/T1728-89.
