One method is the hand feeling method. Due to the fact that foil pouches with spout are composed of four layers, they will have a heavier and thicker feel compared to pouches made with two or three layers of material.

Another method is the bottom gusset colors method, which is specifically applied to U-style spout pouches. If the bottom gusset color is dark silver, it indicates that the pouch is made from PET/AL/Nylon/LLDPE or PET/AL/Nylon/RCPP. If the bottom gusset color is bright silver, it means that the pouch is made from PET/metalized-PET/LLDPE.

Finally, there is the destructive method, which is applied to W-bottom style pouches with spouts. Since this type of spout pouch is made using a special pouch making machine, it is not possible to distinguish the pouch material structure through the bottom gusset color. The only way to confirm the material structure is to destroy the pouch by directly shearing the pouch body.

In conclusion, there are several methods that can be used to confirm the material structure of aluminium pouches with spout. These methods are essential for ensuring the quality and integrity of the packaging, and they can be easily implemented by anyone handling these types of pouches with spouts.