A spout bag is a kind of liquid package with a mouth in the form of flexible package instead of hard package. The structure of the suction nozzle is mainly divided into two parts: suction nozzle and stand up bag. The stand up bag is made of multi-layer composite plastic to meet the requirements of different food packaging properties and barrier properties. Part of the suction nozzle can be regarded as a general bottle mouth with a screw cap on the suction pipe. The two parts are tightly combined by heat sealing (PE or PP) to form a liquid package that can be extruded, sucked, poured or pressed out, which is an ideal new liquid package. 

The biggest advantage of suction nozzle over common packaging forms is portability. The suction nozzle can be conveniently put into a backpack or even a pocket, and the volume can be reduced with the decrease of contents, making it more convenient to carry. The packaging of soft drinks in the market is mainly in the form of PET bottles, composite aluminum paper bags and cans. With the increasingly obvious homogenization competition, the improvement of packaging is undoubtedly one of the powerful means of differentiated competition. The suction nozzle bag has both the repeated packaging of PET bottles and the fashion of composite aluminum paper bags. At the same time, it has incomparable advantages in printing performance compared with traditional beverage packaging. Because of the basic shape of self-standing bag, the display area of the suction nozzle bag is obviously larger than that of PET bottles, and it is superior to the packaging like Tetra Pak which can’t stand. It can be sterilized at high temperature and has a longer shelf life. More single