Melt Polymer Filtration System
Melt Polymer Filtration System
- Continuous dual-chamber alternate filtration eliminates process downtime.
- Uniform melt heating via Biphenyl steam thermal jackets.
- High design pressure capacity up to 25 MPa.
- Customizable multi-layered pleated candle elements or disc packs.
Continuous Melt Filtration Systems
Installing a Continuous Polymer Filter (CPF) on the main melt pipeline is critical to improve polymer melt quality and protect spinnerets and pack assemblies. It effectively captures particles larger than 15-20μm while homogenizing the melt flow and ensuring uniform shear heat distribution.
The system consists of two filter chambers connected via three-way selector valves to the main melt pipeline. Selector valves switch periodically, alternating the active filter chamber. This ensures uninterrupted melt flow when cleaning or replacing filter cores. The housing chambers are cast as a single-piece structure in high-durability stainless steel. Internally, a core cylinder with drainage holes supports multiple pleated candle filter elements. The outer layer utilizes single or multi-layered wire mesh, sintered metal powders, or sintered metal fibers depending on the target filtration rate.
Vertical vs. Horizontal Filtration Systems:
During processes like PET chip spinning, vertical candle-type filters (offering 0.5㎡ filtration area per candle core) are commonly deployed in configurations of 2, 3, or 4 cores (providing 1.0, 1.5, or 2.0㎡ total filtration area, yielding capacities of 150, 225, or 300 kg/h). Vertical systems provide several key process benefits:
- High Thermal Capacity: Uniform insulation jacket structures yield minimal temperature variation and eliminate melt stagnation zones.
- Ease of Operation: Simplified core lifting mechanisms make switching filter chambers fast and efficient.
Operation & Pressure Maintenance:
While clean filters exhibit low differential pressure, polymer impurities gradually block the pores over time. Once the differential pressure climbs to a threshold value (typically 5-7 MPa in PET spinning), the chamber must be switched. Exceeding recommended pressure differences (max 10 MPa) risks rupturing or twisting the filter mesh, lowering filtration precision. Switched elements are cleaned and bubble-tested. Typically, a candle core can be safely reused 10 to 20 times before retirement.
CPF Series Technical Parameters
Below are the standard sizes and dimensional parameters for the PF2T Biphenyl-heated continuous melt polymer filtration systems:
| Model | L (mm) | B (mm) | H (mm) | FIX H3 (mm) | Inlet & Outlet DN | Filter Area (m²) | Screw Bar (Φ) | Flow Rate (kg/h) | Filter Housing (mm) | Filter Element (Qty) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PF2T-0.5B | 900 | 1050 | 1350 | 2200 | 22 | 2 x 0.5 | 65 | 40-80 | Φ158 x 565 | Φ35 x 425 x 4 | 660 |
| PF2T-1.05B | 900 | 1050 | 1350 | 2200 | 30 | 2 x 1.05 | 90 | 100-180 | Φ172 x 600 | Φ35 x 425 x 7 | 690 |
| PF2T-1.26B | 900 | 1050 | 1390 | 2240 | 30 | 2 x 1.26 | 105 | 150-220 | Φ178 x 640 | Φ35 x 485 x 7 | 770 |
| PF2T-1.8B | 950 | 1140 | 1390 | 2240 | 40 | 2 x 1.8 | 120 | 220-320 | Φ235 x 620 | Φ35 x 425 x 12 | 980 |
| PF2T-1.95B | 950 | 1140 | 1390 | 2240 | 40 | 2 x 1.95 | 130 | 250-350 | Φ235 x 620 | Φ35 x 425 x 13 | 990 |
| PF2T-2.34B | 1030 | 1200 | 1430 | 2330 | 40 | 2 x 2.34 | 135 | 330-420 | Φ235 x 690 | Φ35 x 485 x 13 | 1290 |
| PF2T-2.7B | 1150 | 1200 | 1440 | 2350 | 50 | 2 x 2.7 | 150 | 400-500 | Φ260 x 690 | Φ35 x 485 x 15 | 1320 |
| PF2T-3.5B | 1150 | 1250 | 1440 | 2350 | 50 | 2 x 3.5 | 160 | 500-650 | Φ285 x 695 | Φ35 x 485 x 19 | 1450 |
| PF2T-4.0B | 1150 | 1250 | 1500 | 2400 | 50 | 2 x 4.0 | 170 | 600-750 | Φ285 x 735 | Φ35 x 525 x 19 | 1500 |
| PF2T-4.5B | 1150 | 1250 | 1550 | 2400 | 50 | 2 x 4.5 | 180 | 650-900 | Φ285 x 785 | Φ35 x 575 x 19 | 1550 |
| PF2T-5.5B | 1200 | 1300 | 1500 | 2350 | 50 | 2 x 5.5 | 190 | 800-1000 | Φ350 x 755 | Φ50 x 500 x 15 | 1650 |
* Note: H1 and H2 dimensions are customized to fit the customer's site conditions.
Melt Polymer Filtration System Double Chamber Layout