The paper-plastic packaging uses breathable paper, so it is indeed ventilated, but it can block microorganisms. This is in line with the assumption of Shiqiao Moderator Article 2. At present, our technology can meet this requirement, but this ventilation is consistent with our usual understanding. At the same time, in the process of clinical use, we often find that items that have been sterilized are collapsed when they are pinched during the preservation process. It gives people the feeling that their airtightness has been destroyed. Pulp molds such packaging bags. Is it really impossible to ventilate? Is it really unusable to deflate in one pinch? The reasons are as follows:
1. The pore size of the air-permeable paper used in paper-plastic packaging pulp molding is generally 0.4um, which can be air-permeable, but it cannot be felt by hand.
2. The scenario assumed by the Shiqiao moderator: Because the diameter of the scalp needle is small, the diameter of different models is roughly between 200-600um, but it is obviously larger than the normal pore size of breathable paper, and it is also significantly larger than the size of ordinary microorganisms. Pulp is molded to isolate it. The function of microorganisms has indeed been destroyed.
3. However, the air flows in the 200-600um aperture, we still can't feel the obvious air leakage by pinching it with our hands.
4. Therefore, there is currently no simple identification method for pulp molding clinically after inspection of packaging barriers destroyed by pinholes.
5. If the inspection is for inspection, some other methods can be used. For example, the instrument method can use a leak strength tester, and the experimental method can use the dye liquid penetration observation method. The latter is used by immersing the pierced pulp molded packaging sample in the dye solution for observation, and the pinholes will show darker spots. But these methods are not suitable for clinical examination.
With the popularization of disinfection and sterilization, various problems of pulp-molded paper-plastic packaging bags have begun to appear. A common problem is the air leakage of paper-plastic packaging bags. Air leakage of paper-plastic packaging means that the function of isolating bacteria is invalid. It means that the preservation of sterilized items is invalid. Therefore, how to effectively identify whether the sterilized paper-plastic packaging bag is leaking is very important.
