With the development of the market, there are more and more diversified requirements for consumption. The aluminum spout pouch has attracted the attention of many people with its unique shape and convenient characteristics. As the size of the nozzle bag expands, its common quality problems are constantly being raised, mainly including leakage, uneven bag shape, asymmetric bottom seal, and size error.

Heat seal strength
Low heat seal strength is also the cause of leaking aluminum spout pouch. The heat seal strength is low, and the heat seal may be separated under the action of the external environment, resulting in leakage.

Therefore, the heat sealing temperature and heat sealing pressure should be set according to the characteristics of the aluminum spout pouch material. After the heat sealing is completed, a leak test is required. The simplest and most practical method is to fill the bag with a certain amount of air, heat seal the bag mouth, put it into a basin containing water, and squeeze different parts of the bag by hand. , if no air bubbles escape, it means that the sealing and airtightness of the bag is good.

Bag shape is not flat
Flatness is one of the indicators to measure the appearance quality of packaging bags. In addition to material factors, the flatness of the aluminum spout pouch is also related to factors such as heat sealing temperature, heat sealing pressure, heat sealing time and cooling effect. If the heat sealing temperature is too high, the heat sealing pressure is too high, or the heat sealing time is too long, the composite film will shrink and deform. Insufficient cooling will result in insufficient setting after heat sealing, and the internal stress cannot be eliminated, causing the bag to wrinkle. Therefore, the process parameters should be adjusted and the cooling water circulation system should work normally.