Overview
JINGKELIAN QXD 0-100 (cr12 molybdenum vanadium) Grindometer is a special testing instrument designed and manufactured according to the standard GB1724-79 of the Ministry of Chemical Industry. The instrument is mainly used to determine the fineness of particles such as pigments, fillers and impurities in Paints, paint pastes and inks. The measurement results are expressed in microns (μm).
Features
Design according to the national standard GB1724-79 to ensure the accuracy and authority of measurement.
2. Using CR12 molybdenum vanadium material to make scraper, with excellent Abrasion Resistance and durability.
3. The scraper and drawdown blade have high processing accuracy, the plane finish on the scraper reaches 10 levels, and the bottom surface of the chute and the edge finish of the drawdown blade reaches 8 levels to ensure the smoothness of the scraping sample.
4. The plane flatness of key components is strictly controlled, the flatness of the drawdown blade is 0.002mm, and the flatness of the upper plane and the bottom plane of the inclined groove of the scraper is 0.003mm to ensure Measurement accuracy.
5. Single-channe design, the range is 0-100μm, Graduation is 5.0μm, the scale is clear and intuitive.
Principle
The Working Principle of this fineness meter is based on the standard scraper method. The sample to be tested is placed deep in the groove of the scraper grinding, and scraped uniformly along the length of the groove with the matching drawdown blade. Since the groove depth varies continuously from deep to shallow, particles in the sample with a particle diameter larger than the local depth of the groove will be dragged out by the drawdown blade. Observe the scale corresponding to the starting point of the scratch of the sample, which represents the fineness of the largest particle in the sample.
Applications
Paints fineness measurement, lacquer paste fineness measurement, inks fineness measurement
Steps
1. Ensure that the scraper and drawdown blade are clean and drying.
2. Drop the sample to be tested into the deeper end of the groove of the scraper, and the sample volume should be slightly more than the groove capacity.
3. Double hand-held drawdown blade, the drawdown blade edge vertically placed in the front end of the scraper groove (deep end).
4. Within 1-2 seconds, at a uniform speed and appropriate pressure, the drawdown blade is pulled over the entire groove length from deep to shallow, so that the sample is filled with grooves.
Immediately (not more than 5 seconds) under the appropriate rays of light, at an angle of 15-30 ° with the plane of the scraper, observe the position of the particles in the groove evenly exposed.
6. Read the value corresponding to the scale line on the edge of the groove at the starting point of the scratch, which is the fineness value of the sample, in microns (μm).
Notice
• Before and after use, the scraper and drawdown blade must be thoroughly cleaned with solvent, and dried with a soft cloth to prevent the residue from affecting the next Measurement accuracy or corrosion instrument.
• When scraping the sample, the drawdown blade should be kept vertical and scraped at a uniform speed and pressure, and should not be scraped back and forth.
• The reading should be taken immediately after scraping the sample to avoid the evaporation and drying of the sample affecting the observation.
• When observing, you should choose a uniform and sufficient environment with uniform rays of light, and the line of sight should be at an appropriate angle to the plane of the scraper to clearly distinguish the grooves where the particles appear uniformly.
• Avoid collision of drawdown blade with hard objects to prevent damage to the edge and affect the Smoothness of the scraping sample.
• The instrument should be kept properly to avoid heavy pressure and bumping to prevent deformation or damage to the plane of the scraper.
