BOPP T38F special material has a melt index of 2.5-3.6g/10min. A slightly larger melt index is also acceptable, but it cannot be too small, otherwise it may cause processing difficulties. Polypropylene itself can be classified into isotactic, syndiotactic, and random polypropylene based on its structural regularity (crystallinity); According to the presence or absence of copolymerization, there are two types: homopolymer polypropylene and copolymer polypropylene. In order to ensure the film-forming rate of raw materials, the regularity of good specialized materials should be controlled at 96.5%~97.5%. The higher the regularity and crystallinity, the faster the crystallization rate will be; The increase in regularity will result in an increase in the surface hardness of the product; As the regularity increases, the yield strength of the film will significantly increase; When the regularity is high, the Vicat softening point and thermal denaturation temperature are higher; High regularity and poor film-forming properties, but the film has good width.
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