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.

為了保證塑料膠袋的密封性，制造商通常會采用熱封技術將塑料薄膜的兩側粘合在一起，從而形成一個完整的密閉空間。此外，一些高端的塑料膠袋也會在熱封的同時注入氣體，使膠袋內部形成氧氣少、二氧化碳多的氣氛，從而增強食品的保鮮效果。但是，密封性并非的，當溫度變化或袋子受到擠壓等影響時，膠袋的密封性也會發生變化。

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.

對于滲透性，塑料膠袋通常會采用不同的材料和厚度來控制。例如，一些防潮袋和真空袋會采用多層復合材料，其內部包含鋁箔等隔氧材料，可以有效地阻隔空氣和水分的滲透。而普通的塑料袋通常會采用較厚的材料，以減少氣體和液體的滲透。

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.

總的來說，塑料膠袋的密封性和滲透性是相互關聯的，制造商需要綜合考慮這兩個因素以達到佳的包裝效果。在選擇和使用塑料膠袋時，我們也應該注意其密封性和滲透性的要求，以保證食品的質量和。

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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