Method for detecting coating uniformity on paper surface

Abstract

The invention relates to the field of material surface detection and in particular discloses a method for detecting coating uniformity on a paper surface having a dynamic surface friction coefficientof less than 0.25. The method comprises the following steps: drawing a straight line on the paper surface according to a load of (1-0.3degree)N, an angle of 65+ / -0.5 degrees and a speed of (4.5+ / -0.5)m / min by using a pen with the pen point thickness of 0.5mm; (i) the surface coating is uniform when the straight line is continuous or the straight line is discontinuous but points are evenly spaced and the line width is uniform and the width does not exceed 0.2mm; (ii) the surface coating is non-uniform when the ink marks of the straight line are thick or thin sometimes, the straight line is discontinuous and the points are unevenly spaced or the line width is non-uniform; and (iii) the surface coating is non-uniform when the line width exceeds 0.2mm. The coating uniformity between the pointsis detected by the method disclosed by the invention. Compared with the conventional method for detecting the coating uniformity between surfaces, the method disclosed by the invention is fine, accurate, intuitive in detection result and capable of rapidly and accurately judging 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