China wholesale Octagonal Sealing Bag - Middle Sealing Bag Used for mask packaging – Yudu

Middle sealing bag, also known as back sealing bag, is a special vocabulary in the packaging industry. In short, it is a packaging bag with edges sealed on the back of the bag. The application range of back sealing bag is very wide. Generally, candy, bagged instant noodles and bagged dairy products all use this kind of packaging form.The back sealing bag can be used as a food packaging bag, and can also be used for packaging cosmetics and medical supplies.

Advantage:

Compared with other packaging forms, the middle sealing bag has no edge sealing on both sides of the bag body, so the pattern on the front of the package is complete and beautiful. At the same time, the bag pattern can be designed as a whole in the typesetting design, which can maintain the consistency of the picture. Since the seal is on the back, both sides of the bag can bear greater pressure, reducing the possibility of package damage. Moreover, the packaging bag of the same size adopts the form of back sealing, and the total sealing length is the smallest, which also reduces the probability of sealing cracking in a certain sense.

Materials:

In terms of material, there is no difference between back sealing bag and general heat sealing bag. In addition, aluminum plastic, aluminum paper and other composite packaging are also widely used in the form of modified packaging. The most common are bagged milk packaging and large bag melon seed packaging.

Manufacturing process editor

The difficulty in the manufacture and packaging of the middle sealing bags lies in the heat sealing T-shaped mouth. The heat sealing temperature at the “T-shaped mouth” is not easy to control. The temperature is too high, and other parts will wrinkle due to too high temperature; The temperature is too low and the “t” shaped mouth cannot be well sealed.