Express bags and express bags can be roughly divided into: express plastic bags(plastic express bags), express bags(paper express bags), express bubble bags(composite bubble bags), and express bone bags.

Express plastic bag(plastic express bag) material: polyethylene(PE) can be divided into low-density polyethylene(LDPE), high-density polyethylene(HDPE), with low cost, light components and other advantages, The difference between LDPE and HDPE express plastic bags: LDPE clarity, softness contrast, printing color contrast light; HDPE has excellent mechanical properties; In China, delivery bags use LDPE as the main data, while abroad, LDPE and HDPE are usually used as the main data for delivery bags.

Second, express bag(paper express bag) material: usually gray bottom white board paper, white card paper, cattle card paper. The express delivery profession usually uses 200 g/m2 to 450 g/m2 of paper, and express folders have flat, upright features.

Express air bubble bag(composite air bubble bag) material: a transparent soft package filled with air from the middle layer of the air cushion membrane, mainly used for express delivery of small volume fragile, easily damaged goods packaging. There are many small bubbles in the shock reducing bubble film and bubble film, so the body is light and flexible. It has outstanding shock absorbency, impact resistance, non-toxic, tasteless, moisture-proof, corrosion resistance and other advantages.

Fourth, express bag material: osseous bag(also known as compact bag, by the bag, sealed bag, clip bag, self-sealing bag), polyethylene(LDPE) and high-voltage wire polyethylene(LLDPE) After blowing film molding, eager mechanism bag, A plastic bag that can be repeatedly sealed. Bone bags can be used for the packaging of various small items. Self-sealing bags produced with food-grade materials can store various small foods, tea, seafood, etc., waterproof, waterproof, insect-proof, and avoid scattered things.