Classification of express packaging bags

1. Material of express delivery bags: Low density polyethylene (LDPE), commonly referred to as PE, and high-density polyethylene (HDPE), commonly referred to as PO. Express delivery bags have advantages such as low cost and light weight.

The difference between PE and PO in express delivery plastic bags: PE has good transparency and softness, and the printing color is relatively bright; PO has relatively good mechanical properties; In China, PE is commonly used as the main material for express delivery bags, while in foreign countries, PE and PO composites are commonly used as the main material for express delivery bags.

There are two main categories of polyethylene express delivery bags in the market: one is brand new material express delivery bags, and the other is recycled material express delivery bags

2. Material of courier document seals: Generally, gray background white board paper, white cardboard, kraft cardboard, and more are used. The express delivery industry generally uses paper weighing from 200 grams per square meter to 450 grams per square meter, The courier document seal has the advantages of being flat and not easily broken compared to the courier plastic bag.

3. Material of express delivery bubble bag: A transparent soft packaging bag filled with air in the middle layer of the air cushion film. It is mainly used for packaging small, fragile, easily damaged, and less precise goods in the express delivery industry. The express delivery bubble bag is equipped with a shock absorbing bubble film, which contains countless small bubbles, making it lightweight and elastic. It has good shock absorption, impact resistance, non-toxic, odorless, moisture-proof, and corrosion-resistant advantages.

4. Material of express bone bag: Bone bag (also known as dense bag, consisting of any bag, sealed bag, chain clip bag, self sealing bag, English: Ziplock bags, Reclosable Bag, Zipper Closure Bag, Resealable Bag), made of polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE) through blow molding and hot cutting mechanism, is a plastic bag that can be repeatedly sealed. Bone bags can be used for internal and external packaging of various small items. The self sealing bags produced with food grade raw materials can store various small foods, tea, seafood, etc., which are moisture-proof, waterproof, insect proof, and prevent things from scattering.

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The main core research content of the sterile bag industry includes the following aspects