In terms of transparency, the transparency of OPP is better than that of PP. Now the transparency of some high-permeability PP can be close to OPP.
Chemical name of PP: polypropylene? English name: polypropylene (PP for short). The so-called PP bag is a plastic bag made of polypropylene, usually color printing and offset printing. Brightly colored, usually made of woven bags. In addition, PP bag is a kind of stretchable polypropylene plastic, which belongs to thermoplastics. It is non-toxic, tasteless and has a smooth and transparent surface. It is easy to burn, and the flame is droplet-shaped, with yellow on the top and blue on the bottom. After leaving the fire, there is little smoke and it continues to burn. It is mostly used for packaging in cosmetics, food, toys, clothing, stationery, electronics, hardware products and other industries. PP is a crystalline polymer. Among the commonly used plastics, PP is the lightest, with a density of only 0.9 1g/cm3 (smaller than water). Among general plastics, PP has the best heat resistance, its thermal deformation temperature is 80- 100℃, and it can be boiled in boiling water. The material is transparent in color, high in quality and good in toughness. Because of its hard and brittle material, it is only suitable for packaging but not for bearing.
However, PP also has some shortcomings: low dimensional accuracy, insufficient rigidity, poor weather resistance and easy to produce "copper loss". It is prone to aging, brittleness and deformation after demoulding.
OPP chemical name: Oriented Polypropylene English name: Oriented polypropylene (OPP for short), O is oriented, which means oriented, and BOPP is sometimes collectively referred to as OPP. OPP is a kind of directionally stretched polypropylene film with high transparency and brittleness. OPP is folded in half, sealed on the side, and self-adhesive seal is attached to the opening. When in use, put it into the product, tear off the protective skin on the sealing surface, fold the tongue in half and stick it. Easy to use, beautiful and generous, widely used in clothing, food, printing, stationery, cosmetics, paper making and other industries. We can also print various patterns and punch butterfly holes and airplane holes according to customers' needs.