Explore our flagship high-viscosity filtration elements designed for extreme operating temperatures, intense pressure differential ($\Delta P$), and zero-defect output.
In modern polymer melt processing, the physical properties of continuous molten thermoplastics (such as PET, PA66, PP, and PE) present unique challenges: extreme viscosity ranging from 100 to 10,000 Pa·s, elevated operating temperatures up to 350°C, and operational pressures exceeding 250 bar. Standard filtration media often fail under such intense mechanical stress. Custom stainless steel candle filters provide the precise balance of high surface area, structural rigidity, and cleanability required for continuous operation.
By leveraging longitudinal or radial pleated designs, custom candle filters expand the effective active filtration surface by up to 500% compared to smooth cylindrical elements. This dramatically reduces initial differential pressure ($\Delta P$) and significantly prolongs on-stream operational lifetimes before backwash cycles are required.
Utilizing diffusion-bonded multi-layer wire mesh or non-woven metal fiber felts (Bekipor® standard), our elements prevent pore migration under high shear forces. The metallurgical bonds between wire intersections ensure consistent micron ratings under extreme pulsating pressures.
Constructed entirely from premium AISI 316L or 304 stainless steel, our filter cartridges withstand repeated thermal cleaning (TEG vapor, vacuum calcination, or ultrasonic bath cycles), offering up to 20+ reuse cycles and drastically reducing Total Cost of Ownership (TCO).
Comprehensive technical specifications across standard and customized metallic polymer melt candle filter cartridges manufactured by Pujiang HG Plastic Machinery.
| Parameter / Feature | Sintered Wire Mesh Elements | Metal Fiber Felt Elements (Bekipor Grade) | Pleated Mesh Candle Elements |
|---|---|---|---|
| Primary Material Alloys | AISI 304, 316L, 904L, Hastelloy C-276 | AISI 316L Stainless Steel Fiber Micro-Web | AISI 304 / 316L Multi-Layered Mesh |
| Filtration Rating ($\mu m$) | 5$\mu m$ - 250$\mu m$ (Absolute) | 1.5$\mu m$ - 60$\mu m$ (High Dirt Capacity) | 3$\mu m$ - 150$\mu m$ (Maximised Surface Area) |
| Structural Void Volume | 35% - 50% Void Fraction | Up to 75% - 85% High Void Volume | 40% - 60% Void Fraction |
| Collapse Pressure Limit | 150 bar - 250 bar ($\Delta P$) | 210 bar ($\Delta P$) with Perforated Core | 200 bar - 300 bar ($\Delta P$) Heavy Duty |
| Cleanability & Reusability | Excellent (Ultrasonic & Chemical Bath) | Very High (Pyrolysis & Solvents) | Superior (TEG Cleaning & Solvent Flush) |
| Key Application Focus | Standard Extrusion Screen Changers | High-Purity BOPET Film & Fiber Spinning | High Viscosity Resin & Recycling Melts |
As the global polymer processing industry shifts toward circular economy standards, the demand for high-capacity, reusable candle filtration systems has surged across Europe, North America, and the Asia-Pacific region. Buyers and EPC contractors require reliable suppliers capable of delivering precision-engineered components with verified metallurgical consistency.
Post-consumer recycled (rPET, rPP, rPE) resins contain significantly higher levels of organic and inorganic contaminants. High-performance candle filters are essential to prevent filament breakage in fiber spinning and optical defects in blown film lines.
Utilizing automated CNC pleating, laser-beam seam welding, and ultrasonic multi-stage cleaning lines, modern Chinese suppliers deliver world-class precision matching European benchmarks at a competitive total cost profile.
Pujiang HG Plastic Machinery maintains vast raw material reserves of certified 304 and 316L stainless steel wire cloth, guaranteeing fast production turnarounds and mitigating global logistics delays for major plant overhauls.
Every candle filter batch undergoes 100% Bubble Point Pressure Integrity Testing according to ISO 4003, alongside dimensional verification and dimensional tolerance cross-checks prior to international dispatch.
Our custom candle filter elements are engineered to integrate seamlessly into diverse production lines across global manufacturing plants.
Process: Polyester (PET), Polyamide (PA6 / PA66), and Polypropylene (PP) continuous filament production.
Role: Removes particulate matter down to 5 microns prior to spinneret extrusion, eliminating filament breaks, ensuring uniform fiber denier, and extending pack life.
Process: Ultra-thin optical and packaging film manufacturing lines.
Role: Captures gels, degraded polymer aggregates, and micro-particles. Prevents pinhole formation, surface haze, and film tears during high-ratio longitudinal and transverse stretching.
Process: Continuous screen changers in post-consumer bottle flake & film recycling systems.
Role: High collapse-resistant pleated candle elements retain heavy paper micro-fibers, aluminum specks, and dirt while operating under high continuous differential pressures.
Detailed engineering answers to common procurement, maintenance, and technical queries regarding custom metallic candle filter elements.
Pleated candle filters provide up to 2 to 4 times the effective surface area compared to smooth cylindrical filters of the same diameter and length. This increased surface area significantly reduces the melt flow velocity per unit area, resulting in lower initial differential pressure ($\Delta P$), lower shear rate on the polymer melt, and a substantially higher dirt-holding capacity, which directly extends process run times.
Sintered metal wire mesh offers precise, rigid pore geometries ideal for surface filtration and easy cleaning backwash cycles. Sintered metal fiber felt (e.g., Bekipor® grade), on the other hand, features a three-dimensional depth structure with up to 85% void volume. Fiber felt is superior for capturing deformable gels and fine particles down to 1.5–10 microns, making it the preferred choice for high-purity BOPET film and fiber spinning applications.
Yes. We offer complete custom OEM/ODM reverse engineering and manufacturing services. By providing technical drawings, sample components, or housing connection parameters (such as threaded hexagonal adapters, NPT connections, or flat gasket sealing flanges), we fabricate direct-replacement candle filter cartridges that match or exceed OEM specifications.
Stainless steel candle filters can be cleaned and reused multiple times. Common industrial cleaning processes include: (1) Thermal Pyrolysis / Vacuum Calcination to decompose residual polymers into ash; (2) Triethylene Glycol (TEG) solvent bath boiling at 280°C for PET removal; (3) High-pressure fluid back-flushing; and (4) Multi-frequency Ultrasonic Tank Cleaning with specialized alkaline or acid chemical baths to clear sub-micron pore blockages.
All our metallic candle filter elements undergo rigorous quality assurance protocols: (1) Bubble Point Test according to ISO 4003 to verify pore size uniformity and weld seam integrity; (2) Flow Resistance and Differential Pressure Testing; (3) Dimensional Inspection using optical measuring equipment; and (4) Chemical Composition analysis of stainless steel raw materials (DIN EN 10204 3.1 Material Certificate included).
While AISI 304 and 316L stainless steel are standard for most polymer melt applications, we also manufacture candle filters using specialized alloys such as AISI 904L, Hastelloy C-276, and Inconel 600 for applications involving fluoropolymers, aggressive acidic catalysts, or operating temperatures exceeding 400°C.
Discover our expanded range of polymer melt candle elements, leaf disc filters, wire mesh screens, and plastic pelletizing equipment.
Our engineering team provides full CAD drawing support, metallurgical selection advice, and custom sizing within 24 hours. Partner with Pujiang HG Plastic Machinery Co., Ltd. for direct factory pricing and proven global export capability.
