When choosing customized plastic packaging bag manufacturers, we must find reliable ones. We must require new raw materials for production, because inferior plastic packaging bags are quite harmful. As we all know, plastic bags are made of chemicals, and many processing workshops add recycled materials in order to reduce production costs. This kind of plastic bag is definitely unqualified. Of course, don't be careless. According to the different materials used, we can distinguish the materials of the two kinds of plastic bags.
For example, we usually see plastic bags used to package food, because its constituent material is polyethylene film, which is non-toxic. The disadvantage of this material is that its strength is not enough, its sealing property is not enough, and it can not bear high temperature, so it can not be used to pack tea, spices and other items.
But there is another kind called polyvinyl chloride. By one word, it is not the same thing at all. Although polyvinyl chloride is not toxic, people usually mix additives in its use. This additive does great harm to human body. This plastic bag can not be used to package food. It is usually used to make raincoats, soles and handbags.
In fact, the method is very simple. The first is the characteristics of the surface. The surface of polyethylene is milky white. It feels very smooth. When shaking, the sound is also crisp. Then, when burning, polyethylene is flammable, the color is yellow, there will be mucus dripping, and the burning smell is very similar to that of a candle.
If the PVC customized plastic bag is not doped with pigment, it is relatively transparent. It feels different from polyethylene. Some are sticky. It is not crisp when shaking, a little low, and it is not easy to burn. It will go out when leaving the flame. The color of the flame is green, which is significantly different from polyethylene.
If you need custom-made plastic bags, choose the appropriate materials according to the actual situation. For ordinary use, we only need to pay attention to observation and master the material quality of plastic bags. Qualified plastic bags are related to our healthy life.