Plastic particle density tester is widely used in rubber, plastic and other industries to measure the density of plastic particles. However, there are often small bubbles on the surface of the sample when measuring. Many people don't pay attention to such a phenomenon. In fact, bubbles attached to the surface of products have a great influence on the results of sample density measurement.
Why emphasize the effect of bubbles on the density of plastic particles?
1. Long term accumulated experience in measuring the density of plastic particles.
2. Because the measuring plastic is the product of petrochemical industry, the surface of particles has oil composition. Due to the surface tension of water, bubbles are easily attached.
3. In the process of mixing and melting, producing strip drawing and cutting into granules about 0.3cm × 0.8cm, the plastic particles are easy to have pores and bubbles. It causes poor reproducibility when testing plastic particles.
4. Bubbles attached to plastic particles. According to the Research Report:
·A bubble with a diameter of 0.5mm will cause a buoyancy less than 0.0001g;
·A bubble with a diameter of 1 mm will produce a buoyancy force of 0.005 G;
·A bubble with a diameter of 2mm will produce a buoyancy force of about 4.200g.
For example, how to reduce the bubbles attached to the surface of the sample when measuring by the plastic particle density tester?
We need to understand the principle of bubble generation. As long as we dip the sample to be measured in anhydrous alcohol before putting it into the water tank to dissolve the oil stain on its surface, we can effectively remove the bubbles on the surface.
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