The influence of industrial grade OPP plastic bag material purity on transparency

High-purity polypropylene raw materials mean that the content of impurities and additives is extremely low. These impurities and additives will form scattering centers or sites that absorb light inside the plastic film, thereby reducing the transmittance of light and affecting transparency. Therefore, the use of high-purity polypropylene raw materials can significantly reduce the scattering and absorption of light inside the material, allowing light to pass through the film more smoothly, thereby improving the transparency of industrial grade OPP plastic bags.
Polypropylene is a semi-crystalline polymer, and its crystallinity has an important influence on transparency. High-purity raw materials can more easily form a uniform and dense crystalline structure during melt extrusion and directional stretching. This crystalline structure is conducive to the rectilinear propagation of light, reducing the deflection and scattering of light, thereby improving the transparency of industrial grade OPP plastic bags. On the contrary, low-purity raw materials may contain more impurities and additives, which will interfere with the crystallization process, resulting in uneven crystalline structure, which in turn affects transparency.
In addition to improving initial transparency, high-purity polypropylene raw materials can also help maintain the stability of the optical properties of industrial grade OPP plastic bags. During long-term use or storage, low-purity materials may gradually lose transparency due to precipitation of internal impurities or additives, oxidation, etc. High-purity materials can more effectively resist these adverse factors and maintain stable transparency.