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、高压聚乙烯

1、 High pressure polyethylene

高压聚乙烯也称为低密度聚乙烯(LDPE)，在程半透明状态下，产品通常比低压聚乙烯更透明。主要用途有三个：

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、食品包装：糕点、糖果、油炸、糕点、奶粉、盐、茶等

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

2、纺织品包装：衬衫、服装、床上用品、化学纤维制品

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

3、日常化工产品包装。

3. Daily chemical products packaging.

二、低压聚乙烯

2、 Low pressure polyethylene

低压聚乙烯也称为高密度聚乙烯(HDPE)，结晶度高，透明度差，通常半透明，透明度低于HDPE高压聚乙烯产品。主要用途有四个：

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、菌种袋；

1. Garbage bags, bacteria bags;

2、马桶、购物袋、手提包、背包；

2. Toilet, shopping bag, handbag, backpack;

3、塑料保鲜袋；

3. Plastic preservation bag;

4、编织袋内部包

4. Inner package of woven bag

三、聚丙烯

3、 Polypropylene

聚丙烯的聚丙烯与聚乙烯相比，结晶能力可能会减弱很多。特别是无定形聚丙烯结晶度弱，产品的透明度相对较高。主要用于包装纤维、针织品、服装、衬衫等。前三个塑料袋由于其本身的物质结构非极性，不易染色或印刷，需要表面印刷处理。

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

与前三个相比，在物质结构中引入了称为氯元素的物质，结晶效果弱，产品透明度高，由于添加氯元素，材料本身具有极性，因此着色容易打印。

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、礼品袋；

1. Gift bag;

2、包包，针棉包，化妆品包；

2. Bag, needle cotton bag, cosmetic bag;