中文
English
The reason why plastic ziplock bags are used so close to us is that ziplock bags have good sealing properties. For this reason, ziplock bags can be widely used in various fields such as food, industry and agriculture. The following describes how to check the tightness of the ziplock bag.
It can be seen that the sealing property of plastic bags is important for plastic ziplock bags. It can be said that the sealing property determines the value of a plastic ziplock bag. However, there are often problems in daily life, such as production, due to production links. More often, it may cause heat-sealed leakage sealing, press-through or cracks and micropores of the material itself, and form small holes or weak points of internal and external communication. These will directly affect the sealing of the ziplock bag, which is the meaning of the ziplock bag protection product.
The following describes the method for detecting the tightness of plastic ziplock bags:
1. Vacuum observation method, the applicable material of the ziplock bag is the same as above. The sealing performance of the sample is determined by vacuuming the vacuum to make the sample have an internal and external pressure difference, and observing the expansion of the sample and the recovery of the shape of the sample after releasing the vacuum.
2. Underwater pressure method (vacuum method), by vacuuming the vacuum chamber, the internal and external pressure difference is generated in the sample immersed in water, and the gas escape or water infiltration in the sample is observed to determine the sample. Sealing performance.
3. Under waterless penetration method, the sample is filled with test liquid, and after sealing, the sample is placed on the filter paper to observe the leakage of the test liquid from the inside of the sample. It should be measured both positive and negative.
