Cast film metering pumps play a crucial role in cast film production. Their primary functions are as follows:

‌Precise metering and stable delivery of melt: Cast film metering pumps can deliver the high-temperature melt from the extruder, which has already been plasticized, to the cast film die head at a stable flow rate. For example, in the production of polyolefin cast film, the melt metering pump can precisely deliver the melt transported from the extruder screw to the die head at the set flow rate, ensuring a stable supply of melt throughout the casting process. This helps reduce surface ripples and thickness inconsistencies in the cast film, thereby improving product appearance and performance.

Establishing and maintaining pressure: In cast film production, appropriate pressure is a key factor in ensuring uniform melt flow from the die slit. The melt metering pump can establish stable pressure within the system and compensate for fluctuations in extruder output pressure, maintaining relatively stable pressure at the die. This ensures uniform film thickness, thereby improving product quality.

Improving melt quality: Melt metering pumps also perform mixing and homogenization functions during the conveying process. As the melt passes through internal components such as gears within the pump body, it undergoes shear and stirring effects, resulting in more uniform temperature and composition throughout the melt.

Additionally, cast film metering pumps feature high adaptability, high pressure resistance, and minimal flow pulsation, enabling them to accommodate various types of polymer melts while maintaining stable pressure within a wide pressure range. The smooth melt flow they provide helps reduce production issues and improve efficiency.

In summary, the cast film metering pump is an indispensable key piece of equipment in cast film production. Its precise metering, stable delivery, and pressure maintenance functions provide a robust foundation for producing high-quality cast film.