Plastic bags are widely used packaging bags in our daily lives, but their sealing and permeability are two important factors that we need to consider. Sealing refers to the inability to exchange air between the inside and outside of a plastic bag, thereby achieving functions such as preservation, moisture prevention, dust prevention, and insect prevention. Permeability refers to the ability of gases or liquids to pass through plastic bags. If the permeability of plastic bags is high, their preservation effect will be affected.

为了保证塑料胶袋的密封性，制造商通常会采用热封技术将塑料薄膜的两侧粘合在一起，从而形成一个完整的密闭空间。此外，一些高端的塑料胶袋也会在热封的同时注入气体，使胶袋内部形成氧气少、二氧化碳多的气氛，从而增强食品的保鲜效果。但是，密封性并非的，当温度变化或袋子受到挤压等影响时，胶袋的密封性也会发生变化。

To ensure the sealing of plastic bags, manufacturers usually use heat sealing technology to bond the two sides of the plastic film together, forming a complete enclosed space. In addition, some high-end plastic bags also inject gas during heat sealing, creating an atmosphere of less oxygen and more carbon dioxide inside the bags, thereby enhancing the preservation effect of food. However, sealing is not absolute. When temperature changes or the bag is affected by compression, the sealing of the plastic bag will also change.

对于渗透性，塑料胶袋通常会采用不同的材料和厚度来控制。例如，一些防潮袋和真空袋会采用多层复合材料，其内部包含铝箔等隔氧材料，可以有效地阻隔空气和水分的渗透。而普通的塑料袋通常会采用较厚的材料，以减少气体和液体的渗透。

For permeability, plastic bags usually use different materials and thicknesses to control. For example, some moisture-proof bags and vacuum bags will use multi-layer composite materials, which contain oxygen blocking materials such as aluminum foil inside, which can effectively block the infiltration of air and water. Ordinary plastic bags usually use thicker materials to reduce the penetration of gases and liquids.

总的来说，塑料胶袋的密封性和渗透性是相互关联的，制造商需要综合考虑这两个因素以达到佳的包装效果。在选择和使用塑料胶袋时，我们也应该注意其密封性和渗透性的要求，以保证食品的质量和。

Overall, the sealing and permeability of plastic bags are interrelated, and manufacturers need to consider these two factors comprehensively to achieve optimal packaging results. When selecting and using plastic bags, we should also pay attention to their sealing and permeability requirements to ensure the quality and safety of food.

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