The primary raw materials used for blown film extrusion are various types of plastics, with the most common being:
Low-Density Polyethylene (LDPE): Known for its flexibility, moisture resistance, and low density, making it ideal for bags and packaging films.
Linear Low-Density Polyethylene (LLDPE): Offers improved strength and puncture resistance compared to LDPE, often used for stretch films and grocery bags.
High-Density Polyethylene (HDPE): More rigid and stronger than LDPE, used for items like shopping bags, agricultural films, and container liners.
Polypropylene (PP): Known for its higher melting point and clarity, often used for food packaging, labels, and reusable bags.
Polyethylene Terephthalate (PET): Occasionally used for blown films when higher strength and thermal resistance are needed, such as in specialty applications.
Additives: Various additives, such as UV stabilizers, anti-block agents, and colorants, may also be included to enhance performance characteristics.
