A method for detecting the uniformity of paper surface coating

Abstract

The invention relates to the field of material surface detection, and specifically discloses a method for detecting the coating uniformity of a paper surface with a dynamic surface friction coefficient less than 0.25. Draw a straight line at an angle of °±0.5° and a speed of (4.5±0.5)m / min; (i) When the straight line is continuous or the straight line is discontinuous but the points are evenly spaced and the line width is uniform and the width does not exceed 0.2mm, It indicates that the surface is evenly coated; (ii) when the ink of the straight lines is thick and sometimes thin, the straight lines are intermittent and the interval between points is uneven or the line width is uneven, it indicates that the surface is unevenly coated; (iii) When the line width exceeds 0.2 mm, it indicates uneven surface coating. What the present invention detects is the uniformity of coating between points, which is finer and more accurate than the existing detection method of uniformity of coating between surfaces, and the detection results are intuitive, and can quickly and accurately judge The surface coating uniformity of the paper.

Description

technical field [0001] The invention belongs to the field of material surface detection, and in particular relates to a method for detecting the uniformity of coating on the surface of paper. Background technique [0002] Thermal master paper is one of the special consumables for digital all-in-one speed printers. The printing quality of digital all-in-one speed printers is not only related to machine factors such as the resolution of the machine itself, but also related to the quality of thermal master paper. In order to make the all-in-one machine continue to make plates and print normally, and achieve good printing results, the film surface of the heat-sensitive paper must be coated with a layer of coating (silicone oil layer), and the coating must be even, otherwise there will be heat-sensitive paper into the machine. Difficulty, wrinkled plate during printing, continuous plate making, poor printing quality and other printing problems, and even thermal head burnt out due...

AI Technical Summary

Problems solved by technology

There are two conventional detection methods for the coating quality of heat-sensitive paper: one is to gently rub the film surface of heat-sensitive paper with hands to feel the smoothness of the film surface. This method is simple and convenient to operate, but due to the The surface and the film surface are surface-to-surface contact, which can only simply judge the coating of the film surface, but cannot judge whether the coating is uniform; another detection method is to use a surface friction coefficient meter to test the smoothness of the film surface, although this This instrument test method can measure the specific friction coefficient value of the film surface, but its test principle is the same as the first method, which is still surface-to-surface contact, and this test method requires expensive test instruments, and the test process is cumbersome. It is okay for laboratory testing or factory parameter value testing, but it is not suitable for testing whether the heat-sensitive protective layer is uniform during the production process, and it is not convenient for ordinary routine testing or random testing when users choose master paper