Extrusion Components
Polymer Melt Pumps
Introduction
The Polymer Melt Pump Series is designed to provide stable, precise, and pulsation-free melt conveying for polymer extrusion processes. Installed between the extruder and the die, the melt pump ensures constant melt pressure and output, significantly improving product consistency, dimensional accuracy, and overall extrusion efficiency.
The series covers a wide range of applications including compounding, sheet, film, pipe, profile, pelletizing, and high-performance polymer processing, providing reliable solutions for various extrusion systems.
Overview
A polymer melt pump is a positive displacement gear pump specifically designed for high-temperature polymer melts. By precisely transferring molten polymer at a constant volumetric rate, the pump isolates pressure fluctuations generated by the extruder and delivers a stable melt flow to downstream equipment.
Compared with extrusion systems operating without a melt pump, the use of a melt pump provides more stable pressure, improved dimensional consistency, reduced melt temperature, lower screw wear, higher production capacity, and better overall product quality.
DA-H Standard
Introduction
A general-purpose polymer melt pump designed for most extrusion applications, providing stable melt pressure, accurate metering, and improved extrusion consistency.
Key Features
- Standard extrusion configuration
- Stable melt pressure
- Precise volumetric metering
- Reduced pressure fluctuation
- Improved product dimensional consistency
- Increased extrusion output
- Lower melt temperature
- Reduced screw wear
- Reliable continuous operation
- Easy maintenance
DA-X Reinforced
Introduction
A reinforced melt pump designed for high-pressure and demanding extrusion applications requiring higher mechanical strength and long-term operational reliability.
Key Features
- Reinforced housing structure
- Higher pressure capability
- Heavy-duty bearing system
- Improved sealing performance
- Stable operation under high load
- Suitable for engineering plastics
- Long service life
- Continuous industrial production
DA-M Bottom Discharge
Introduction
Designed for bottom discharge applications in polymer reactors, providing stable polymer transfer from polymerization equipment to downstream processing systems.
Key Features
- Bottom discharge configuration
- Continuous melt transfer
- Stable reactor discharge
- High-temperature operation
- Low residence time
- Reduced material degradation
- Suitable for polymerization processes
- Reliable continuous conveying
DA-S Pipeline
Introduction
A pipeline melt pump designed for stable polymer transfer between extrusion process units while maintaining constant flow and pressure.
Key Features
- Pipeline installation
- Stable melt conveying
- Constant volumetric output
- Low pulsation flow
- High conveying efficiency
- Continuous production
- Suitable for transfer systems
- Easy integration
DA-Z Circular
Introduction
A compact circular-body melt pump designed for extrusion systems requiring space-saving installation without compromising metering accuracy.
Key Features
- Compact circular housing
- Space-saving installation
- Stable melt delivery
- High metering accuracy
- Low leakage design
- Easy installation
- Reliable continuous operation
- Optimized internal flow path
Technical Specifications
| Specification | DA-H Standard | DA-X Reinforced | DA-M Bottom Discharge | DA-S Pipeline | DA-Z Circular |
|---|---|---|---|---|---|
| Primary Application | Extruder boosting & stable melt delivery | High-pressure polymer transfer | Reactor bottom discharge | Pipeline melt transfer | Compact extrusion systems |
| Pump Body | Tool Steel / Ni-Cr Alloy Steel | Tool Steel / Ni-Cr Alloy / Titanium Alloy | Stainless Steel / Carbon Steel / Hastelloy / Monel | Tool Steel / Stainless Steel / Ni-Cr Alloy | Tool Steel |
| Gear Material | Tool Steel / Nitriding Steel | Tool Steel / Nitriding Steel / Wear-resistant Coating | Tool Steel / Nitriding Steel / Special Coating | Nitriding Steel / Stainless Steel | Tool Steel / Nitriding Steel |
| Bearing Material | Tool Steel | Tool Steel / Tungsten Carbide | Tool Steel / Titanium Alloy / Silver Alloy | Tool Steel / Special Coating | Tool Steel / Special Coating |
| Shaft Seal | Spiral / Packing / Combined Seal | Spiral Seal | Mechanical / Packing / Flushing Seal | Spiral / Packing / Combined Seal | Spiral / Packing Seal |
| Heating Method | Electric Heating | Electric Heating | Thermal Oil / Gas Heating | Thermal Oil Heating | Electric Heating |
| Flow Capacity Range | 0.5–3200 cc/rev | 0.5–3200 cc/rev | 0.5–120000 cc/rev | 0.5–12000 cc/rev | 0.5–2500 cc/rev |
| Polymer Viscosity | ≤ 4000 Pa·s | ≤ 4000 Pa·s | ≤ 4000 Pa·s | ≤ 4000 Pa·s | ≤ 4000 Pa·s |
| Max. Operating Temperature | ≤ 400 °C | ≤ 400 °C | ≤ 400 °C | ≤ 400 °C | ≤ 400 °C |
| Max. Cleaning Temperature | ≤ 450 °C | ≤ 450 °C | ≤ 450 °C | ≤ 450 °C | ≤ 450 °C |
| Max. Outlet Pressure | ≤ 40 MPa | ≤ 40 MPa | ≤ 40 MPa | ≤ 40 MPa | ≤ 40 MPa |
| Inlet Pressure | — | — | Vacuum to 1.5 MPa | — | — |
NOTE:
The PULIMO Polymer Melt Pump Series includes five specialized configurations designed for different extrusion processes and installation requirements. While all models operate on the same positive displacement gear pump principle, each series is optimized for a specific application.
- DA-H Standard – A general-purpose melt pump suitable for most polymer extrusion lines, providing stable melt pressure and accurate melt metering.
- DA-X Reinforced – Designed for high-pressure extrusion applications with enhanced structural strength and higher pressure capability.
- DA-M Bottom Discharge – Specifically developed for reactor discharge and direct polymer transfer from polymerization systems.
- DA-S Pipeline – Designed for melt conveying within transfer pipelines, ensuring continuous and stable polymer transportation.
- DA-Z Circular – A compact circular-body design suitable for installations where space is limited while maintaining excellent metering performance.
Selecting the appropriate model depends on polymer viscosity, processing temperature, system pressure, throughput requirements, and installation configuration.
Key Technologies
Designed for long-term continuous operation under demanding polymer processing conditions.
- Precision involute gear technology
- High-strength alloy steel gears
- Optimized bearing support system
- High-temperature shaft sealing design
- Low leakage internal flow path
- Modular heating system
- High pressure and high temperature operation
- Stable volumetric metering
- Low pulsation melt delivery
- Optimized flow channel design
Applications
Typical Industries
- Plastic Compounding
- Masterbatch Production
- Pipe Extrusion
- Profile Extrusion
- Sheet Extrusion
- Cast Film Production
- Blown Film Production
- Fiber & Monofilament Production
- Wire & Cable Compounds
- Engineering Plastics
- High-Performance Polymer Processing
- Recycling & Pelletizing
Typical Materials
Commodity Plastics
- Polyethylene (PE)
- Polypropylene (PP)
- Polyvinyl Chloride (PVC)
- Polystyrene (PS)
Engineering Plastics
- Polyamide (PA)
- Polycarbonate (PC)
- Polyoxymethylene (POM)
- Polyethylene Terephthalate (PET)
- Polybutylene Terephthalate (PBT)
Elastomers
- Thermoplastic Polyurethane (TPU)
- Thermoplastic Elastomers (TPE)
- Thermoplastic Vulcanizates (TPV)
- Rubber Compounds
Filled & Reinforced Materials
- Glass Fiber Reinforced Compounds
- Carbon Fiber Reinforced Compounds
- Mineral Filled Plastics
- Flame-Retardant Compounds
High-Performance Polymers
- Polyether Ether Ketone (PEEK)
- Polyether Ketone Ketone (PEKK)
- Polyphenylene Sulfide (PPS)
- Polyetherimide (PEI)
- Liquid Crystal Polymer (LCP)
Interested in This Product?
If you’re interested in this product or have a specific application in mind, feel free to contact us. Share your material, process requirements, production capacity, and application details, and our team will recommend the most suitable configuration and technical solution to meet your production needs.
Our engineering team will recommend the most suitable solution.