Vertical Twin-Cylinder Dual-Stage Continuous Switching Melt Filter
Product Overview
The Vertical Twin-Cylinder Dual-Stage Continuous Switching Melt Filter is a premium filtration system designed for continuous high‑polymer melt filtration. Featuring a twin‑cylinder, dual‑stage configuration that combines coarse and fine filtration, it is widely used in chemical fiber spinning, recycled material spinning, plastic extrusion, and related processes.
Designed and manufactured in accordance with pressure vessel standards, the unit offers multiple heating options including vapor phase (diphenyl), thermal oil circulation, and static electric heating, ensuring uniform heating and excellent thermal insulation. The three‑way switching valves are easy to operate, reliable, leak‑free, and eliminate dead zones.
Working Principle
The equipment adopts an innovative filtration mode that combines parallel twin‑cylinder and series dual‑stage designs.
Twin‑Cylinder Continuous Switching : Two vertical filter chambers are installed side by side. When the filter elements in one chamber need cleaning, the switching valve seamlessly transfers melt flow to the other chamber without interrupting production – enabling online switching and ensuring continuous line operation.
Dual‑Stage Filtration : Melt first passes through the primary coarse filtration stage to remove large particles, then is conveyed by a pump to the secondary fine filtration stage to eliminate fine impurities and gel particles. This two‑stage process effectively removes contaminants and gels, improving product quality and significantly extending the service life of spinning packs.
Flow Path Design : The melt enters from the bottom and exits from the top, with an outside‑in flow through the filter elements. The internal channels are smooth and free of dead zones, ensuring stable spinning without broken filaments during switching.
Key Advantages
1. Continuous Production Without Shutdown
The twin‑cylinder switching design allows filter element cleaning and replacement without stopping the production line – effectively eliminating a long‑standing industry bottleneck and dramatically increasing equipment utilization and output.
2. Dual‑Stage Filtration for Superior Quality
The coarse‑plus‑fine filtration system effectively removes impurities and unmelted gel particles from the melt, improving spinnability and ensuring product consistency. Spinning pack service life can be extended by 3‑5 times compared to single‑stage filtration.
3. Significant Energy Savings
The vertical double‑cylinder structure consumes approximately 30% less energy than horizontal filters, substantially reducing operating costs.
4. Smooth, Disturbance‑Free Switching
Patented dual‑wheel three‑way switching valve technology ensures stable, manual‑easy switching between cylinders without pressure or temperature fluctuations, maintaining consistent spinning quality.
5. Superior Structural Design
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Compact vertical footprint saves floor space
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Dead‑zone‑free internal flow channels
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Excellent sealing, uniform heating, and easy filter element replacement
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Integrated heating and insulation reduce heat loss
Technical Specifications
| Model | Pipe Diameter (mm) | Filtration Area (m²) | Rated Flow (kg/h) | System Pressure | Diphenyl Jacket Pressure | Allowable Differential Pressure | Max. Operating Temperature |
|---|---|---|---|---|---|---|---|
| CPF-PT4-1.26/1.05 | 30 | 1.26/1.05 | 100–140 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-1.8/1.26 | 30 | 1.8/1.26 | 130–160 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-3.5/2.5 | 40 | 3.5/2.5 | 200–250 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-5.5/3.5 | 40 | 5.5/3.5 | 260–350 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-7.5/4.5 | 50 | 7.5/4.5 | 400–520 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-9.5/5.5 | 50 | 9.5/5.5 | 500–600 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-12/7.5 | 50 | 12/7.5 | 650–750 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-15/9.5 | 65 | 15/9.5 | 800–1000 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
| CPF-PT4-19/12 | 65 | 19/12 | 1100–1500 | Max 25 MPa | ≤0.6 MPa | Max 6 MPa | ≤310℃ |
Major dimensions can be customized according to customer requirements.
Applications
This filter is suitable for continuous filtration of high‑polymer melts to remove impurities and unmelted gel particles. Typical applications include:
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Recycled material spinning – fine filtration of PET, PP, PE bottle‑flake regrind
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Polyester staple fiber (PSF) production
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Polyester POY / FDY filament production
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Zipper monofilament and plastic steel strip production
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Plastic pelletizing processes
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Bottle‑flake direct‑spun nonwovens
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High‑speed spinning and fine‑denier fiber production
The filter plays a vital role in extending spinning pack life, improving equipment utilization, and boosting output, especially in high‑speed, fine‑denier, and recycled‑material spinning.
Heating Options
Flexible heating solutions are available to meet specific process needs:
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Thermal oil electric heating
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Thermal oil circulation heating
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Static diphenyl (vapor phase) heating
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Diphenyl circulation heating
Structural Features
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Housing with two vertical filter chambers
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Complete melt inlet and outlet connections
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Inlet and outlet switching valves mounted horizontally on the same side of the chambers
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Feed inlet at the lower end, discharge outlet at the upper end of each chamber
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Vent port at the top and drain port at the bottom
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Filter elements easily replaceable inside the chambers
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Optional electric or manual switching operation
Why Choose Our Product?
✅ Continuous operation – online switching without stopping production
✅ Dual‑stage filtration – coarse + fine for superior quality
✅ 30%+ energy saving – vertical design outperforms horizontal types
✅ Smooth switching – patented three‑way valve technology ensures stability
✅ Dead‑zone‑free flow path – bottom‑in, top‑out for optimal flow
✅ Multiple heating options – adaptable to different process requirements
✅ Full range of capacities – filtration areas from 1.05 to 19 m² covering diverse throughputs
✅ Built to pressure vessel standards – safe, reliable, and durable
Customization Services
We offer comprehensive customization – filtration area, pipe diameter, heating method, structural dimensions, and more can be tailored to your specific process needs. Contact us today for a dedicated technical proposal!
Designed and manufactured in accordance with pressure vessel codes. Quality assured, with full after‑sales support.
