Polymer Extrusion Melt Pump
The polymer extrusion melt pump is a core auxiliary equipment in the extrusion molding process of polymer materials such as plastics and rubber.
It is mainly used to stabilize the melt pressure and flow rate and improve the precision of extruded products. It is widely used in the production of films, pipes, profiles, plates, etc.
Its design is based on the principle of volumetric conveying and can effectively compensate for the shortcomings of the extruder itself in pressure/flow control.
Advantage of polymer extrusion melt pump
Compared with the traditional process of "extruder directly connected to the mold" and the same type of screw melt pump, the gear melt pump has significant advantages in "precision, adaptability, and maintenance cost"
| Stable flow and pressure | Flow fluctuation can be controlled within ±0.3% (traditional extruder fluctuation ±5%-±15%, screw melt pump ±0.5%-±1%); pressure deviation ≤±0.5% | 1. Extremely high dimensional accuracy of extruded products (e.g., lithium battery separator thickness tolerance reduced from ±5% to ±1%); 2. Completely eliminates mold flash, product shorts, or surface "ripple" defects caused by sudden pressure changes. |
| Suitable for high viscosity and heat-sensitive melts | The "low shear conveying" characteristics of gear meshing can handle melts with viscosities up to 40,000 Pa·s (such as PMMA and PPS); at the same time, it reduces the residence time of the melt in the pump (<10s) to avoid high temperature degradation | 1. Expand extrusion applications for high-value-added materials (such as specialty engineering plastic pipes and highly transparent medical profiles); 2. Reduce the yellowing rate of heat-sensitive materials such as PVC and PET (yellowness index reduced by 20%-30%) |
| Lower energy consumption and higher efficiency | It can reduce the extruder screw back pressure by 30%-50% (reducing the additional shear work of the screw on the melt), reducing the total energy consumption of the extruder by 10%-25%; at the same time, the extruder output is increased by 15%-40%. | 1. Reduce energy consumption per unit of product (especially for high-volume film production lines, annual electricity savings can reach hundreds of thousands of kWh); 2. Improve equipment utilization (reduce downtime and cleanup time due to melt degradation) |
Typical Application of polymer extrusion melt pump
1. High-end film production: such as lithium battery separators and optical-grade BOPET films, require precise thickness tolerance control (within ±1μm).
2. Medical tubing production: such as infusion tubing and dialysis tubing, requires ensuring inner diameter uniformity and melt cleanliness (free of particulate matter).
3. Extrusion of high-viscosity materials: such as specialty engineering plastics like PPS and PEEK, require low-shear conveying to prevent molecular chain breakage.
4. Multi-layer co-extrusion products: such as high-barrier packaging films (PE/EVOH/PE) and composite tubing (PPR/glass fiber reinforced layer/PPR), require precise control of the proportions of each layer.
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