What are the characteristics and applications of waterproof express bags?

Some express goods are afraid of water and need to be packed in waterproof express bags. Do you know what are the waterproof courier bags? What are the characteristics and applications of the waterproof courier bags? Also, how to detect the air tightness of the waterproof courier bags? What are the waterproof courier bags 1. Conventional: plastic courier bags, the main material It is PE (polyethylene, a kind of thermoplastic resin made by polymerization of ethylene), or PO/PE co-extruded film (extruding one kind of raw material to another kind of film or combining different kinds of already made The films are bonded together to form a multilayer film). There are more PE used in China, and the latter used in Europe and North America is more common. But no matter what, it is waterproof, and it is a one-time destruction of the sealing process.　　 2. Currently called composite bubble bag, this is also a kind of express waterproof bag. It can be compounded with kraft paper, pearl film, co-extruded film, and aluminized film. It is also waterproof, and has good shock-proof and anti-extrusion functions. It is commonly used for electronic products and CD express logistics packaging and transportation. What are the characteristics and applications of 　　 waterproof courier bags?　　 Low-density polyethylene (LDPE) usually refers to PE, high-density polyethylene (HDPE) usually refers to PO, and express plastic bags have the advantages of low cost and light weight.　　 A transparent flexible packaging bag filled with air in the middle layer of an air cushion film. It is mainly used for the packaging of small, fragile, fragile, and less precise goods in the express industry.　　How to check the air tightness of waterproof courier bags　　There are two ways to test the airtightness of waterproof bags. One is to directly put the waterproof bag of the mobile phone in the water and observe whether there will be water in the waterproof bag. This method requires the naked eye to observe whether the water enters, which may not be so accurate; at the same time, after the test is completed, the water on the product needs to be wiped dry, and the test process is more complicated.　　 Tags:,pE waterproof bag