PE modified masterbatch melt pumps primarily utilize high-precision positive displacement gear pumps. Their core functions include stabilizing melt pressure, ensuring precise metering and delivery, and reducing extrusion fluctuations. These pumps are compatible with base materials such as HDPE, LDPE, and LLDPE, as well as modified applications involving fillers, colorants, and functional masterbatches. They serve as critical equipment for enhancing masterbatch dispersion uniformity and batch consistency.
| Parameter | Recommended Range | Selection Key Points |
| Melt Viscosity | 5~20,000 Pa·s | Filled / Glass-reinforced: Select high-viscosity type (≤40,000 Pa·s) Color masterbatch / Impact-modified: Select standard type |
| Operating Temperature | ≤350℃ | PE degradation temperature approx. 300°C; reserve 50°C safety margin; temperature control accuracy ±1°C |
| Pressure Specifications |
Inlet 0.5~3 MPa; Outlet 15~30 MPa; |
Maximum pressure differential ≤25 MPa Match pressure loss from extruder → screen changer → die head; reserve 10~20% margin |
| Displacement / Flow Rate |
Displacement: 0.5–3000 cc/r; Flow Rate: 30–12,000 kg/h |
Select based on masterbatch capacity ×1.2; variable frequency speed control covers 70–110% of rated flow rate |
| Gears and Materials |
Helical / Herringbone teeth; Pump body / Gears: Nitrided steel or duplex stainless steel |
Wear-resistant and corrosion-resistant, suitable for high-filler applications like calcium carbonate and glass fiber |
| Sealing Method |
Melt dynamic seal + packing seal, or metal bellows mechanical seal |
Leak-proof, high-temperature resistant, minimizes melt degradation risk |
Core Value
Pressure Stabilization: Reduces pressure pulsation to ±1%, enhancing masterbatch color/performance consistency.;
Metering: Near-linear flow-to-speed relationship, compatible with loss-in-weight feeding closed-loop control.
Efficiency Enhancement: Lowers extruder backpressure, minimizes shear heat, prevents PE molecular chain breakage.
Installation & Configuration
Positioning: Extruder → Screen changer → Melt pump → Die head. Install 100–150 mesh filter upstream of pump inlet to prevent impurity jamming.
Temperature control: Electric heating or thermal oil heating. Synchronize temperature control for pump body and inlet/outlet piping.
Drive system: Connect gear motor via universal joint coupling to counteract thermal deformation. Equipped with variable frequency speed control.
Maintenance and Common Faults
Preheat to process temperature and maintain for 30 minutes before startup to prevent cold-start wear.
Flush with clean PE before shutdown to remove residual modified fillers (e.g., carbon black, glass fiber).
Common Faults: Significant pressure fluctuations (check inlet pressure/screen clogging), leakage (replace seals), abnormal noise (inspect gear wear or foreign objects).
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071
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TEL：+86 371 67991755
WhatsApp： +86 158 38331071
Adress: No.22 Dongqing Str., High & New Technology Development Zone, Zhengzhou, China.
