Reasons for damage to vacuum pack bags for food

　　There are four specific reasons for the loss of vacuum pack bags for food:

　　1. The barrier properties of the material. For example, for packaging with OPP/PE structure, the degree of vacuum will be significantly reduced 2 weeks after vacuuming, so the material for vacuum packaging must have a certain gas barrier property.

　　2. The air tightness of vacuum pack bags for food. If there are tiny incompletely sealed cracks on the sealing edge, then air will enter the packaging bag through these cracks and cause loss of vacuum. For example, pillow-shaped packaging at the junction of the two-layer and four-layer materials in the horizontal seal, or when the inner material is contaminated by the contents (such as grease, powder, etc.) or wrinkles on the sealing edge, will cause poor sealing.

　　3. Mechanical damage. a. Pierced by the contents, such as vacuum-packed bones, fried peanuts and other objects with sharp edges; b. Damage from foreign objects, such as pierced by the edges of adjacent packaging bags, crystals on the vacuum pack bags for food material The point destroys the barrier layer material, and the burr on the edge of the sealing knife damages the packaging material; c. The material has poor flex resistance, and the barrier property is greatly reduced in the packaging circulation.

　　4. Another possibility is that the gas produced by the fermentation (anaerobic respiration) of the contents of the vacuum pack bags for food causes the vacuum to decrease. Of course, this can be confirmed by vacuuming the packaging bag to refill other items.