Why do some vacuum packaging bags leak air after being used for a period of time？

When we use vacuum packaging bags to package products, we usually inspect the products that have been vacuumed. Although there was no air leakage during the inspection and the appearance of the vacuum packaging bag was intact, after a period of time, it was discovered that the vacuum packaging bag was leaking. What is the reason for this? From the perspective of vacuum packaging bag manufacturers, there are several points that need to be noted.

The material selection for vacuum packaging bags is not appropriate.

The thickness is not appropriate.
The thickness of a vacuum packaging bag determines its strength. Only a vacuum packaging bag with sufficient thickness can withstand a reasonable product weight. If your product weight does not match the strength of the vacuum packaging bag, this situation will occur. When vacuuming the bag, due to the stretchability of plastic materials, especially when vacuuming irregularly shaped products, the deformation of the vacuum packaging bag is more severe. Although some excessively stretched areas may not appear damaged, they have actually become very thin, so that natural damage may occur after being used for a period of time.
The size of the vacuum packaging bag is not suitable.
The reason why vacuum packaging bags leak due to improper size is easy to understand. Generally speaking, when we vacuum, we often use molds. When vacuum packaging bags are vacuumed in the mold, they will stretch according to the shape of the mold. If the size is not enough, they will squeeze each other even harder. Therefore, the vacuum packaging products that looked perfect at the time may have been excessively stretched and squeezed.

Bag breakage occurred during storage and transportation.
Products that are vacuum packaged should also be protected during storage and transportation. If sharp objects pierce them during storage and transportation, the vacuum packaging bag will be damaged and there may be air leakage. Sometimes, the punctured area may appear very small and cannot be seen, giving people the illusion that it is a intact vacuum packaging bag. Actually that even a small crack could cause air leakage in the vacuum packaging bag, and there was no difference in the size of the crack.
There is a problem with the sealing of the vacuum packaging bag
When vacuuming the vacuum packaging bag, the temperature and time of the sealing must be adjusted reasonably. If the sealing is not firm, it is possible that over time, some air may slowly enter the bag, causing it to break through the sealing of the vacuum packaging bag and start to leak.
The product inside the vacuum packaging bag has deteriorated.
Vacuum packaging bags cannot indefinitely extend the shelf life of products. If the product is used for too long, it can cause the goods inside the packaging to deteriorate, and it can also cause air leakage in the vacuum packaging bag. Deteriorated goods can produce gas, change shape, and decay, all of which may damage the vacuum packaging bag and cause air leakage.

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Fujin New Materials, After Several Years Of Development, Has Developed Into A Packaging Enterprise With A Certain Scale. Our Company Integrates R & D, Design, Printing, Bag Making, Testing And After-Sales Service Into A Comprehensive Printing Company. Our Company Is Specialized In Producing Vacuum Food Bag, Aluminum Foil Bag, Opp Bags, Pe Bags, Recyclable Coffee Bag, Kraft Paper Ziplock Bags, Snacks Packaging Pouches, Stand Up Ziplock Bags, Pet Food Bag, Etc.