Cast film products have stringent requirements for thickness uniformity. In traditional single-extruder conveying processes, output stability is affected by various factors such as feeding disturbances, temperature fluctuations, and periodic screw pulsations, making it difficult to meet high-precision production requirements. Melt pumps have now become standard core equipment in cast film production lines, positioned between the extruder and the die.
The core function of a melt pump is to precisely meter and deliver the high-temperature melt—which has been fully plasticized by the extruder—at a constant flow rate. Based on its positive displacement delivery characteristics, the flow control accuracy can reach within ±1%. This effectively isolates pressure disturbances from the upstream extrusion end, keeping pressure fluctuations at the die inlet at an extremely low level, thereby addressing the root cause of non-compliant thickness uniformity in cast film. Furthermore, the shear forces generated during melt conveyance homogenize the melt, further improving the uniformity of melt temperature and composition, and optimizing the final physical properties and surface flatness of the cast film.
Currently, melt pumps are compatible with the processing of most polymer melts, including PE, PP, and PET, covering the full range of cast film production scenarios from general-purpose packaging films to high-performance functional films; At the same time, the melt pump can perform partial pressure-building functions, allowing the extruder to operate under low-pressure, low-temperature conditions. Field tests have shown that this can increase production line capacity by more than 20% and reduce energy consumption per unit of product by 10% to 25%, delivering multiple benefits including improved product quality, increased production efficiency, and reduced energy consumption.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071
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WhatsApp： +86 158 38331071
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