The tightness and bulk of paper and paperboard are important indicators to measure the physical properties of paper, and their determination methods are as follows:
Tightness measurement: measured by air specific gravity method or Burst strength Tester. The air specific gravity method is to put the sample to be tested into a container of known volume, measure its weight and volume, calculate its air specific gravity, and then convert it into a tightness value; the Burst strength meter clamps the sample in two parallel ring fixtures In between, a horizontal force is applied to make it rupture, and the rupture strength is calculated, and then converted into a tightness value.
Determination of bulk thickness: water resistance test or folding test. The water resistance test is to put the sample in water for a certain period of time, then lift the sample with a standard quality hook, measure its weight, and calculate its bulk; the folding test is to fold the sample many times, and then lift the sample with a standard quality hook , Measure its weight and calculate its bulk.
Beichao reminds you: During the measurement process, you should pay attention to standard operations, maintain the consistency of measurement conditions, and avoid measurement errors. At the same time, attention should be paid to the preparation and storage of samples to avoid the influence of external factors on the performance of samples.
