1. Key Parameters & Specifications
The filter chamber is the core component of a melt filter, and its key parameters directly determine the filter’s performance.
| Parameter | Typical Value / Description | Remarks |
|---|---|---|
| Number of chambers | 2 | Designed as “one active, one standby” for continuous operation (no‑stop screen changes). |
| Chamber shape | Cylindrical (drum‑type) | Other designs (e.g., prismatic or cylindrical) also exist. |
| Filter element configuration | Each chamber houses a set of filter elements (typically 17 rods) | The elements are rod‑shaped, made of five‑layer sintered metal wire mesh. |
| Filtration area per chamber | 65 sq. ft. (approx. 6 m²) | This is the main indicator for sizing the filter. |
| Filtration precision | Ranges from 20 μm to 40 μm | Different grades (e.g., X6, X7) are selected based on process requirements. |
| Operating pressure | Start‑up pressure: 2.156 × 10⁶ Pa Change‑over pressure: 8.33 × 10⁶ Pa |
When the differential pressure exceeds 3 MPa, the filter elements need to be replaced. |
2. Structure & Component Breakdown
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Chamber body – As a high‑temperature, high‑pressure vessel, its inner wall is typically made of stainless steel to ensure melt cleanliness. The design avoids filtration dead spots (e.g., using petal‑shaped packing structures).
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Heating & temperature control – Each chamber has an external jacket through which diphenyl vapor is circulated for heating and insulation, with an additional insulating layer to maintain the melt at the optimal temperature for flow.
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Flow diversion & switching system:
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Diverter valve – The core component, usually an FD slide‑shaft‑type valve, which controls the melt flow into either chamber.
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Switching mechanism – Uses slide plates or piston movements to redirect the flow path. Some designs adopt single‑plunger valves that utilize the melt’s own pressure to seal and prevent leakage.
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Auxiliary valves:
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Vent valve – Mounted on top of the diverter valve to release trapped air.
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Drain valve – Located at the bottom to facilitate draining of residual melt during disassembly and cleaning.
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3. Working Mode & Principle
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Dual‑chamber rotation – The two chambers work together: one is online for filtration while the other is on standby or being cleaned offline.
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No‑stop screen change – When the online chamber requires element replacement, the diverter valve is operated to instantly switch the melt flow to the standby chamber, keeping the production line running without interruption.
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Two‑stage filtration applications – In some advanced designs, the two chambers can handle different filtration grades. For example, the first stage uses a coarser 400‑2000 μm punched screen for rough filtration, protecting the second stage 80‑300 μm laser‑drilled screen. This effectively extends the life of the more expensive precision screens and reduces costs.
4. Maintenance & Cleaning
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Cleaning criteria – Based primarily on the differential pressure across the filter inlet and outlet. When the pressure difference reaches the set value (e.g., 3 MPa), it indicates severe clogging and the elements need to be replaced or cleaned.
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Preparation before cleaning – Before disassembly, close the inlet valve, open the drain valve, and introduce nitrogen through the vent valve to purge residual melt and gas from the chamber, ensuring safe operation.
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Operating steps – Use the hydraulic system to slowly retract the plunger, remove the old screen, clean the area, quickly install the new screen, and then smoothly push the plunger back into its working position.
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Structural convenience – Some designs incorporate chamber positioning pins and locking rods; by simply loosening the rods, the chamber can be lifted vertically for easy removal and replacement.
This information is compiled from multiple equipment manufacturers and industry technical references, and serves as a detailed reference for understanding the melt filter filter chamber.
Let me know if you need a more concise version or any specific section expanded. 😊
