1. Express plastic bag material: low density polyethylene (LDPE) usually refers to PE, high density polyethylene (HDPE) usually refers to PO, express plastic bags made by the courier bag making machine have the advantages of low cost and light weight. 

Food bag manufacturers tell you the difference between PE and PO in express plastic bags: PE has better transparency, softness and brighter printing color; PO has relatively good mechanical properties; domestic express packaging bags are also made of PE As the main material, foreign express uses PE and PO compound as the main express material. 

Food bag manufacturers tell you that there are two types of polyethylene express bags on the market: one is new material express bags, and the other is recycled material express bags 

2. The cover material of the messenger document: white paper with gray background, white cardboard and kraft cardboard are the majority. Compared with express plastic bags, express document seals have the advantage of being flat and not easily broken. 

3. Express bubble bag material: a transparent flexible packaging bag filled with the atmosphere by the air cushion film layer in the middle. It is mainly used for the packaging of small, fragile, fragile and less detailed goods in the express industry. The Quick Bubble Bag comes with shock absorbing bubble wrap. There are some small air bubbles in the bubble film, so it is light and soft, with good shock absorption, impact resistance, non-toxic, odorless, moisture-proof and corrosion-resistant properties. 

4. Fast bone bag material: Food bag manufacturers tell you that bone bag (also called compact bag, made of any bag, seal bag, zipper bag, ziplock bag, polyethylene (LDPE) and low pressure linear polyethylene (LLDPE) , made by blown film forming, heat cutting machine) bags, made of resealable plastic bags, bone bags can be used for inner and outer packaging of various small items, self-sealing bags of food materials can store various small foods, Tea, seafood, etc., moisture-proof, waterproof, insect-proof, and avoid equipment scattering. 

5. Express woven bag: also known as snakeskin bag. It is a type of plastic used for packaging, and its material is usually various chemical plastics such as polyethylene and polypropylene. The color of the woven bag is usually red or gray-red, non-toxic and tasteless, and it is usually less harmful to the human body. Although it is made of various chemical plastics, it is more environmentally friendly and has a higher acceptance; it is used in packaging and packaging of various items and is widely used in industry. 

YG plastic bag making machine manufacturer supply various kinds of plastic bag processing machines.Such as T-shirt bag making machine,zip lock bag making machine,side seal bag making machine,diaper bag making machine,Bag On Roll Machine,flower sleeve bag making machine,ect.