The sensitivity of this experimental method depends on the pressure difference and pressurization method. The determination of experimental pressure for each packaging material and specification is crucial for achieving reproducible results. Improper pressurization of packaging can significantly reduce the sensitivity of this test method. Increasing the pressure difference will improve the experimental sensitivity. However, excessive pressure can cause the seal to crack or bubbles to be ejected from the breathable material, leading to confusion with defective bubbles, which may result in incorrect conclusions about the existence of defects.

Take an appropriate amount of sample and measure the water resistance of glass particles at 121 ℃ using the YBB00252003-2015 grading method. The sample should meet the requirements of Grade 1. According to YBB00252003-2015, the preparation method for glass particles is as follows: the test sample is crushed into small pieces, an appropriate amount is placed into a grinding bowl, a pestle is inserted, and the pestle is struck with a hammer, only once. The glass in the grinding bowl is transferred to the O-sieve on the upper layer of the sieve, and the above operation process is repeated. Use a vibrating or manual sieve for 5 minutes to transfer the glass particles that have passed through sieve A but remain on sieve B into a weighing bottle. Then conduct water resistance testing according to the measurement method specified in the standard.

Used to measure the resistance of soft packaging film materials to rubbing and forming pinholes. This experiment can also simulate the rolling, folding, and other behaviors of the film during production, processing, and transportation. By comparing the changes in the number of pinholes, barrier properties, or other physical properties of the sample before and after rolling, the anti rolling performance of the sample can be judged, providing technical support for the practical application of packaging film materials.