Plastic bag factories produce various products with different properties, and the use of each product is different. Products with different uses use different raw materials according to their physical characteristics. Here are some common raw materials and uses for the production of plastic bags

一、高壓聚乙烯

1、 High pressure polyethylene

高壓聚乙烯也稱為低密度聚乙烯(LDPE)，在程半透明狀態下，產品通常比低壓聚乙烯更透明。主要用途有三個：

High pressure polyethylene, also known as low density polyethylene (LDPE), is usually more transparent than low-pressure polyethylene when it is semi transparent. There are three main uses:

1、食品包裝：糕點、糖果、油炸、糕點、奶粉、鹽、茶等

1. Food packaging: pastry, candy, fried, pastry, milk powder, salt, tea, etc

2、紡織品包裝：襯衫、服裝、床上用品、化學纖維制品

2. Textile Packaging: shirts, clothing, bedding, chemical fiber products

3、日?；ぎa品包裝。

3. Daily chemical products packaging.

二、低壓聚乙烯

2、 Low pressure polyethylene

低壓聚乙烯也稱為高密度聚乙烯(HDPE)，結晶度高，透明度差，通常半透明，透明度低于HDPE高壓聚乙烯產品。主要用途有四個：

Low pressure polyethylene, also known as high density polyethylene (HDPE), has high crystallinity, poor transparency, usually translucent, and lower transparency than HDPE products. There are four main uses:

1、垃圾袋、菌種袋；

1. Garbage bags, bacteria bags;

2、馬桶、購物袋、手提包、背包；

2. Toilet, shopping bag, handbag, backpack;

3、塑料保鮮袋；

3. Plastic preservation bag;

4、編織袋內部包

4. Inner package of woven bag

三、聚丙烯

3、 Polypropylene

聚丙烯的聚丙烯與聚乙烯相比，結晶能力可能會減弱很多。特別是無定形聚丙烯結晶度弱，產品的透明度相對較高。主要用于包裝纖維、針織品、服裝、襯衫等。前三個塑料袋由于其本身的物質結構非極性，不易染色或印刷，需要表面印刷處理。

Compared with polyethylene, the crystallization ability of polypropylene may be much weaker. In particular, the crystallinity of amorphous polypropylene is weak, and the transparency of the product is relatively high. It is mainly used for packing fiber, knitwear, clothing, shirt, etc. The first three plastic bags are not easy to be dyed or printed due to their non-polar material structure, so they need surface printing treatment.

四、聚氯乙烯

4、 PVC

與前三個相比，在物質結構中引入了稱為氯元素的物質，結晶效果弱，產品透明度高，由于添加氯元素，材料本身具有極性，因此著色容易打印。

Compared with the first three, the introduction of chlorine into the material structure has weak crystallization effect and high transparency of the product. Due to the addition of chlorine, the material itself has polarity, so the coloring is easy to print.

1、禮品袋；

1. Gift bag;

2、包包，針棉包，化妝品包；

2. Bag, needle cotton bag, cosmetic bag;