Product Overview
The Twin Cylinder Melt Filter (also known as dual-cylinder continuous screen changer) is a high-performance filtration solution designed for polymer melt processing in extrusion, spinning, and pelletizing applications. Featuring two independent filter cylinders operating in parallel, this system enables continuous production with zero downtime during screen changes – one cylinder remains online while the other is being serviced or replaced.
As the final filtration stage in polymer production lines, the melt filter removes impurities, gel particles, and凝聚 agglomerates from the molten polymer, ensuring superior product quality and extending the service life of downstream equipment such as spinnerets and extrusion dies.
How It Works
The Twin Cylinder Melt Filter operates on a continuous switching principle:
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Dual Filtration Channels: The polymer melt is divided into two flow channels inside the filter housing, each passing through a separate filter cylinder equipped with screen packs supported by breaker plates.
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Seamless Switching: When the filter screen in one cylinder becomes clogged (indicated by a rise in differential pressure), the flow is redirected to the alternate cylinder via inlet and outlet switching valves. The clogged cylinder can then be isolated, depressurized, and serviced – all while production continues uninterrupted.
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Bottom-to-Top Flow Design: Many models adopt a bottom-in, top-out melt flow path with an external-in, internal-out排气 process. This design ensures smooth internal channels with no dead corners, guaranteeing stable switching without fiber breakage or thread fluctuation.
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Heating Jacket: Both filter cylinders are equipped with external heating jackets (thermal oil or biphenyl circulation) to maintain precise melt temperature and prevent polymer degradation.
Key Features & Advantages
🔄 Continuous Operation – Zero Downtime
One filtration channel remains online while the second screen is changed, eliminating production stoppages and maximizing extrusion line utilization.
📊 Stable Pressure & Flow
The dual-cylinder design ensures minimal pressure fluctuation during screen switching, maintaining consistent melt flow and preventing defects in final products.
⚡ Energy Efficient
Vertical twin cylinder configurations consume approximately 30% less energy compared to horizontal designs, delivering significant operational cost savings.
🧩 Optimized Flow Path
Bottom-in, top-out design with streamlined internal channels eliminates dead zones, minimizes melt residence time, and prevents polymer degradation.
🔒 Reliable Sealing
Advanced self-sealing structures (patented technology) eliminate leakage problems and reduce maintenance complexity.
🌡️ Uniform Heating
External heating jackets with thermal oil or biphenyl circulation ensure even temperature distribution and rapid heat-up, meeting the requirements of various specialty spinning applications.
🧹 Easy Maintenance
The modular design allows for quick filter element replacement and cleaning, reducing labor intensity and maintenance downtime.
Technical Specifications
| Model | Pipe Diameter (mm) | Filtration Area (㎡) | Rated Flow (kg/h) | Max System Pressure | Allowable ΔP | Max Operating Temp |
|---|---|---|---|---|---|---|
| CPF-PT4-1.26/1.05 | 30 | 1.26/1.05 | 100–140 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-1.8/1.26 | 30 | 1.8/1.26 | 130–160 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-3.5/2.5 | 40 | 3.5/2.5 | 200–250 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-5.5/3.5 | 40 | 5.5/3.5 | 260–350 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-7.5/4.5 | 50 | 7.5/4.5 | 400–520 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-9.5/5.5 | 50 | 9.5/5.5 | 500–600 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-12/7.5 | 50 | 12/7.5 | 650–750 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-15/9.5 | 65 | 15/9.5 | 800–1000 | 25 MPa | 6 MPa | ≤310°C |
| CPF-PT4-19/12 | 65 | 19/12 | 1100–1500 | 25 MPa | 6 MPa | ≤310°C |
Source: Manufacturer technical data
Additional Specifications:
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Biphenyl Jacket Pressure: ≤0.6 MPa
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Single Cylinder Filtration Area: 1.05–19 ㎡
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Melt Pipe Diameter: φ20–100 mm
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Heating Power: 5–50 kW / 220V
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Heating Media: Biphenyl or thermal oil (electric heating, circulation heating, or static heating available)
Applications
The Twin Cylinder Melt Filter is widely used across the polymer processing industry for:
🧵 Fiber & Spinning
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Polyester (PET) staple fiber and filament production
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Chemical fiber spinning (POY, FDY)
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Recycled material spinning (bottle flake, foam scrap)
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Fine denier and micro-denier fiber production
♻️ Recycling
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PET bottle recycling and pelletizing
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Post-consumer resin (PCR) processing
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Regrind and reclaimed material filtration
📦 Extrusion & Compounding
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Plastic sheet and film extrusion
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Stretch film production
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Polymer modification and compounding
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Masterbatch production
🧪 Materials Processed
The filter is compatible with a wide range of polymers including:
PET, PP, PE, PS, ABS, PA, PC, PMMA, PEEK, PPA, PBAT, PLA, SAN, and various engineering polymers.
Why Choose Our Twin Cylinder Melt Filter?
| Feature | Benefit |
|---|---|
| Continuous switching | No production downtime during screen changes |
| Dual-stage filtration (optional) | More effective removal of impurities and gel particles |
| Extended spinneret life | Cleaner melt reduces wear on downstream components |
| Consistent product quality | Stable pressure and flow eliminate defects |
| Energy efficient | Up to 30% lower energy consumption vs. horizontal designs |
| Low maintenance | Self-sealing design reduces leakage and service frequency |
Selection Guide
To select the right Twin Cylinder Melt Filter for your production line, please consider the following parameters:
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Extruder screw diameter (mm)
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Hourly throughput (kg/h)
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Polymer type and melt viscosity
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Operating temperature (°C)
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Maximum system pressure (MPa)
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Die/adaptor interface dimensions
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Filtration precision requirement (mesh count or micron rating)
Our engineering team can perform flow channel and filtration area calculations based on your specific process requirements to ensure optimal performance.
Contact Us
Ready to upgrade your melt filtration system? Contact our team today for a customized solution tailored to your production needs.
