Self-sealing bag refers to the packaging bag that can be sealed automatically by pressing, such as clip chain self-sealing bag, blow bone (concave-convex bone) self-sealing bag and so on.

Chain-clip self-sealing bag (also known as dense bag, including bone-attached bag, sealed bag, chain-clip bag and keel bag, in English: Ziplock bags, reclosable bags, zipper-closed bags and resettable bags).

Plastic bags made of polyethylene (LDPE) and high tension polyethylene (LLDPE) can be sealed repeatedly by blow molding and hot cutting machinery. Common materials are PE, EVA, PO, multi-layer composite zipper bag, etc.

Self-sealing bags can be used for the internal and external packaging of various small items (ornaments, hardware, toys). Self-sealed bags made of food-grade raw materials can store all kinds of snacks, tea, seafood and so on. , moisture-proof, odor-proof, waterproof, insect-proof, and anti-scattering.

Self-sealing bags can also be used to package clothes and other daily necessities, with a wide range of uses. Anti-static self-sealing bag can be produced by adding anti-static master batch in film blowing production, which is generally used in electronic industry.

There are two kinds of chain clip self-sealing bags. One is direct film blowing molding, which is generally above 1.8CM and thicker near the self-sealing. The left and right sides of the self-sealing pocket are made into finished products through heat sealing; The other is the method of attaching chain, and the latter method is mainly used in the production of composite bags.

The production of self-sealing adhesive bags mainly adopts single film for cross cutting and double-sided heat sealing. The front and back sides of the bag are different in length, one side is 3-5cm longer than the other, and the folded back part is pasted with glue such as adhesive and destructive glue. When in use, the plastic cover on the colloid is torn off and folded to seal the bag.