In cast film production, melt pumps serve as the core link between the extruder and the die head, with their primary value lying in stabilizing the process and ensuring product precision. It precisely delivers the high-temperature melt, fully plasticized by the extruder, to the die head at a stable flow rate. With flow control accuracy within ±1%, it effectively compensates for fluctuations in extruder output pressure, maintaining die head pressure within the required process range. Even when there are slight changes in raw material feed rate or ambient temperature, the system responds and adjusts rapidly. This prevents defects such as uneven thickness and surface ripples or streaks in the cast film at the source, significantly improving the yield rate of finished products.

In addition to its fundamental role in stabilizing pressure and flow, the melt pump also optimizes melt quality to meet diverse production needs. As the melt passes through the pump’s gears, it undergoes shear mixing, homogenizing both temperature and composition to enhance the optical properties and mechanical strength of the cast film; At the same time, it offers exceptional adaptability. Whether handling general-purpose thermoplastics such as PE and PP or high-performance engineering plastics like PA and PET, the pump can stably process melts with viscosities ranging from hundreds to hundreds of thousands of centipoise. It also supports multi-layer co-extrusion processes, precisely controlling the ratio of materials in each layer to meet the production requirements of high-end barrier films, composite films, and other products.

Installing a melt pump also delivers significant improvements in quality and efficiency for the production line. By transferring the extruder’s pressure-reduction function to the melt pump, the extruder can operate at lower pressure and temperature. This not only drastically reduces leakage but also increases output by 15%–30%, lowers energy consumption per unit by approximately 25%, and reduces wear on the screw and barrel, thereby extending the extruder’s service life; At the same time, the compact and reliable structural design—which features a small footprint, low failure rate, and easy maintenance—ensures long-term, continuous, and stable operation of the production line, thereby reducing downtime and maintenance costs.