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. according to the materials used.
1. Material of express plastic bags (plastic express bags): Polyethylene (PE) can be divided into low polyethylene (LDPE) and high density polyethylene (HDPE), which has the advantages of low cost and light weight. LDPE and HDPE express plastic bags Differences: LDPE has a good contrast in brightness and softness, and print colors are bright in contrast; HDPE has outstanding mechanical properties; in domestic, courier bags use LDPE as the main data, while abroad, they usually use LDPE and HDPE as a composite Master information of the express bag.
2. Express document bag (paper express document bag) materials: usually gray-white paper, white cardboard, cattle cardboard mostly. The express delivery profession usually uses 200 to 450 grams of paper, and the express document bag is flat and erect.
3. Express bubble bag (composite bubble bag) material: a kind of transparent soft packing bag filled with air from the middle layer of air cushion film. It is mainly used for the packaging of small and fragile goods that are easy to damage. Courier bubble bag contains shock-absorbing bubble film, there are many small bubbles in the bubble film, so it is light and flexible, has excellent shock absorption, impact resistance, and is non-toxic, odorless, moisture-proof, and corrosion-resistant.
4. Courier bone bag materials: bone bags (also known as compact bags, free bags, sealed bags, chain bags, ziplock bags), blown with polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE). Hot cut machine bag, made of a resealable plastic bag. Bone bags can be used for front and back packaging of various small items.
https://www.beiguomachine.com/
