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Back seal bag is also called medium seal bag, which is the packaging industry special vocabulary. Simply put, it is a packaging bag with edge banding on the back of the bag body, back seal bag application range is very wide, including general candy, bagged instant noodles, bagged dairy products, etc. are used in such packaging forms.

Compared with other packaging forms, the back seal bag has no edge on both sides of the bag body, so it ensures that the pattern on the front of the package is complete and more beautiful. At the same time, the layout design can design the bag body pattern as a whole, which can maintain the consistency of the design. And because the seal is on the back, the two sides of the bag can withstand more pressure, reducing the possibility of package breakage. Moreover, the same size of packaging bag adopts the form of back seal, and the total length of sealing is the smallest, which also reduces the probability of sealing cracking in a certain sense.