The back-sealed pouch is also called a pillow-shaped bag and a middle-sealed bag. The bag is composed of upper, lower, and rear seams to form a pillow shape. The back-sealing bag adopts hidden vertical edge sealing, which guarantees the integrity of the front pattern of the package to the greatest extent. In the process of packaging design, setting the pattern of the bag body as a whole can keep the picture coherent, exquisite and beautiful, and have distinctive appearance characteristics. The back seal bag is sealed on the back, and the pressure on both sides of the bag is stronger, and the possibility of package damage is greatly reduced. The packaging bag of the same size adopts the form of back seal to minimize the total length of the seal, and to a certain extent, the probability of cracking the seal will also be reduced. Finally, the back-sealing bag can effectively reduce the cost of packaging materials, and the consumption of consumables is small. It can reduce the consumption of packaging materials by about 40% without affecting the production speed, and the cost advantage is obvious.

And its inherent moisture-proof, waterproof, moth-proof, and anti-scattering advantages make the back-sealing bag widely used, mainly used for product packaging, storage of medicines, cosmetics, food, frozen food, etc.