Express bags and express bags can be roughly divided into: express plastic bags (plastic express bags), express document bags (paper express document bags), express bubble bags (composite bubble bags), express bone bags, etc.
1. Materials of express plastic bags (plastic express bags): polyethylene (PE) can be divided into low density polyethylene (LDPE), high density polyethylene (HDPE), with the advantages of low cost and light weight, LDPE and HDPE express plastic Differences in bags: LDPE has good transparency and softness, and the printing color is brighter; HDPE has excellent mechanical properties; in China, express bags use LDPE as the main material, while abroad, usually use LDPE, HDPE composite As the master data of the courier bag.
2. Material of express document bag (paper express document bag): usually white cardboard with grey background, white cardboard and kraft cardboard. The express industry usually uses paper with a weight of 200 g/m2 to 450 g/m2, and the express document bag is flat and upright.
3. Material of express bubble bag (composite bubble bag): a transparent flexible packaging bag filled with air from the middle layer of the air cushion film, which is mainly used for the packaging of small volume fragile and easily damaged goods in the express industry. There are many small bubbles in the bubble film, so it is light, elastic, has excellent shock absorption, impact resistance, as well as non-toxic, odorless, moisture-proof, corrosion-resistant and other advantages.
4. Material of express bone bag: bone bag (also known as compact bag, free bag, sealed bag, zipper bag, self-sealing bag), which is formed by polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE) by film blowing. Eagerly cut machine-made bags, a type of plastic bag that can be resealed. Bone bags can be used for inside and outside packaging of various small items. The ziplock bags produced with food-grade materials can store all kinds of small food, tea, seafood, etc., moisture-proof, waterproof, insect-proof, and prevent things from being scattered.