Why are OPP plastic bags and PE plastic bags transparent?

Why are the plastic bags in use transparent? This is mainly because any crystal type opening agent has a certain negative effect on the transparency of the plastic bag, that is, a kind of mist is formed in the film. However, the degree of influence will be different due to the different types of opening agent used in the product. However, the main factors affecting the transparency of the plastic bag are as follows: 1. The chemical purity of the opening agent. The purity of chemically synthesized crystals is much higher than that of natural minerals. Therefore, the transparency of the anti-blocking agent manufactured by the chemical synthesis process is significantly higher than that of natural minerals.　　2, the amount of opening agent added. Crystal-type antiblocking agents have different sources, among which heavy crystals refer to natural mineral antiblocking agents, and the other is light crystals which refer to antiblocking agents synthesized by chemistry. The difference between the two is that under the same volume, there is a significant difference in weight.　　 3. The light refractive index of the anti-blocking agent. When direct light passes through the contact interface of two different materials, if the two different materials have the same refractive index, the direct light passing through has the least loss in the linear range of the original incident angle. If the refractive index difference of two different substances is greater, the direct light passing through will lose more in the linear range of the original incident angle. Therefore, natural talcum powder and silica both cause greater attenuation of direct light and have a significant impact on the transparency of the plastic bag.　　 Label: pe transparent sealed bone bag