How to use the scraper Fineness Meter correctly?
In the manufacturing process of architectural coatings, scraper gauges are commonly used to measure the fineness of color paste-or paint, so the correct use of scraper gauges is helpful to control the quality of architectural coatings. The fineness of color paste and coating is measured by scraper Fineness Meter and expressed in microns. The two types of scraper fineness gauges commonly used in architectural coatings have a measuring range of (0-100) µm and (0-50) µm. When the fineness is 30µm or less, a scraper Fineness Meter with a range of 50µm is used, and when the fineness is (31-70)µm, a scraper Fineness Meter with a range of 100µm is used. The scraper fineness gauge needs to be carefully cleaned and dried with a solvent before use, and a soft cloth (such as medical gauze) should be used when scrubbing.
Stir the sample that meets the standard viscosity index of the product with a small paint knife or glass rod, stir well, and then drop a few drops of the sample into the deepest part of the groove of the scraper Fineness Meter, so as to fill the groove and slightly It is better to be redundant.
Hold the scraper with both hands and place it horizontally on the upper end of the polishing plate so that the scraper is in vertical contact with the surface of the polishing plate. Within 3 seconds, pull the scraper from the deep part of the groove to the shallow part, so that the paint sample fills the groove without leaving any remaining paint on the plate. Immediately (not more than 5 seconds) after the scraper is pulled, make the line of sight and the groove plane form an angle of 15°-30°, observe the uniformity and exposure of the particles in the groove with the light, and record the reading (accurate to the minimum score). If individual particles are exposed on other graduation lines, there shall not be more than 3 particles within the range between the reading and the adjacent graduation lines. .Parallel tests are generally done 3 times, and the test results are the arithmetic mean of two similar readings. The error of the two readings should not be greater than the minimum division value of the instrument.
