A melt pump, also called melt gear metering pump, is an indispensable precision auxiliary equipment installed between the extruder and die head on plastic film extrusion lines. It is widely used for BOPP, blown film, cast film and packaging film manufacturing, solving the common pain point of unstable melt pressure and flow from screw extruders during continuous production.
Working on positive displacement gear metering principles, the melt pump separates the melting task and pressure-building task of the extrusion system. The extruder only focuses on plasticizing raw polymer materials, while the melt pump undertakes precise metering and stable pressure delivery of high-temperature plastic melt to the die. It effectively suppresses pressure pulsations caused by screw rotation, feeding variation and viscosity changes, keeping melt flow stable and greatly improving film thickness uniformity across the web.
For plastic film producers, upgrading extrusion lines with a melt pump brings tangible production benefits. Stable melt output reduces film gauge deviation, cuts scrap rate and raises finished yield. The extruder runs under lower backpressure, which reduces screw load and energy consumption, extending the service life of extruder and die components. It also supports higher production throughput and flexible raw material switching, including recycled resin blends, helping manufacturers improve profit margins.
Designed to match different film extrusion processes, melt pumps are compatible with PE, PP, PET and other polymer materials. When paired with hydraulic screen changers, the whole extrusion system achieves continuous filtration and stable melt supply, minimizing downtime during screen replacement.
For modern plastic film factories pursuing high precision and low waste, integrating a reliable melt pump into the extrusion line is a cost-effective upgrade. It stabilizes the whole extrusion workflow, ensures consistent film quality and strengthens competitiveness in flexible packaging, agricultural film and barrier film markets.
