Explore our OEM/ODM product portfolio built for extreme thermal tolerance, exact micron rating precision, and long-term durability in continuous polymer melt filtration.
In high-viscosity polymer processing, melt filtration acts as the vital safeguard protecting fine spinnerets, film die orifices, and downstream pump equipment. A Candle Filter Cartridge is a specialized cylindrical filter element designed specifically to handle extreme operating pressures (up to 250 bar / 3,600 psi) and elevated temperatures (reaching 350°C). Placed within Continuous Polymer Filtration (CPF) systems, candle filters remove gel particles, degraded polymers, metallic micro-contaminants, and inorganic impurities from fluid streams such as Polyester (PET), Polyamide (Nylon 6/66), Polypropylene (PP), and Polyethylene (PE).
The structural design of a candle filter element centers on maximizing effective filtration surface area within a compact pressure vessel volume. Utilizing a central perforated support core wrapped with multi-layered sintered metal mesh, sintered metal fiber fleece (felt), or high-density wire cloth, candle filter cartridges achieve high dirt-holding capacity with minimal initial pressure drop ($\Delta P$).
Technical Insight: By selecting a pleated candle filter architecture over flat smooth cylindrical media, the active filtration surface area can be expanded by 200% to 450%. This directly correlates with longer continuous on-stream operational cycles, reduced frequency of thermal cleaning cycles, and decreased overall total cost of ownership (TCO) for plant operators.
Tailored filtration solutions engineered for demanding industrial environments where zero-defect output is non-negotiable.
Used extensively in PP spunbond hygiene and medical fabric lines. Removes cross-linked micro-gels to prevent filament breaks, spinneret hole blockages, and web defect formation during high-speed spinning.
High-transparency packaging and optical-grade films require zero particulate gel contamination. Sintered fiber candle cartridges capture hard particles down to 3–5 microns, ensuring flawless film clarity and tensile strength.
Essential for POY, FDY, and staple fiber production in PET, PA, and acrylic plants. Maintains strict shear stress control across polymer melt flow to safeguard filament continuity.
Installed in continuous hydraulic screen changers for rPET, rHDPE, and rPP pelletizing. Efficiently traps residual debris, aluminum flakes, and un-melted specs from post-industrial waste streams.
Integrated directly at monomer/polymer reaction exit outlets to purify molten virgin resin prior to underwater strand pelletizing, meeting strict resin purity standards for international buyers.
Over the past two decades, China’s industrial filtration ecosystem has evolved into a global powerhouse, combining raw metallurgical material dominance with precision engineering. As a leading specialized manufacturer located in Zhejiang, Pujiang HG Plastic Machinery Co., Ltd. exemplifies how Chinese supply chain synergies deliver unmatched performance-to-cost ratios for international buyers.
Direct sourcing of premium stainless steel wire (SUS 316L, 304L, Hastelloy) and metal fiber fleeces from certified domestic alloy mills ensures pristine purity, batch consistency, and immediate material traceability.
Equipped with state-of-the-art high-vacuum sintering furnaces and robotic micro-TIG longitudinal seam welding equipment, guaranteeing high structural weld integrity without thermal oxidation.
Optimized production workflows and integrated tooling design enable us to deliver European-equivalent filtration performance at 30% to 50% lower capital outlay, accelerating procurement ROI.
For international procurement directors, technical buyers, and plant managers, sourcing candle filter cartridges requires stringent compliance validation, precise engineering drawings, and reliable supply chain security. Standardizing filter replacements across global manufacturing hubs demands adherence to international quality protocols.
Quality Guarantee & Inspection Protocols: Every batch of candle filter elements produced at our facility undergoes 100% Bubble Point Testing (per ISO 4003) to verify absolute micron rating, combined with Pressure Drop vs. Flow Rate Testing (ISO 3968) and Weld Integrity Testing.
Our filter products comply with major global regulatory standards, making them suitable for direct installation on European, American, and Asian OEM extrusion machinery (such as Maag, Nordson, BKG, Kreyenborg, and Reifenhauser systems):
| Specification Category | Standard Parameters | Enterprise Customization Options |
|---|---|---|
| Material Options | 316L (1.4404), 304 (1.4301) Stainless Steel | Hastelloy C-276, Inconel 600, 904L, Monel |
| Filter Media Type | Sintered Metal Fiber Fleece, Multi-Layer Wire Mesh | Pleated Stainless Steel Wire Cloth, Sintered Powder |
| Filtration Rating | 3μm, 5μm, 10μm, 20μm, 40μm, 75μm, 100μm | Dual-stage graduated micron layers (Custom) |
| Collapse Differential Pressure | Delta P = 25 Bar to 210 Bar | High-strength heavy core for extreme viscosity |
| Sealing Mechanisms | Metal-to-Metal Cone Seal, Flat Gasket, NBR/FKM O-ring | Silver-plated copper gaskets, custom threaded ends |
| Quality Compliance | ISO 9001:2015, REACH, RoHS Compliant | FDA Food Contact Compliance for Packaging |
As polymer manufacturing shifts toward sustainable circular economies and higher throughput speeds, candle filter cartridge designs are rapidly evolving. Staying ahead requires continuous R&D and adopting next-generation metallurgical structures.
Advanced vacuum pyrolysis, TEG (Triethylene Glycol) boiling, and high-frequency ultrasonic cleaning techniques allow modern 316L candle filters to be cleaned and re-used 20+ times without media degradation, drastically lowering annual replacement costs.
Utilizing multi-stage graduated density metal fibers improves dirt capacity by up to 60% compared to traditional uniform wire cloth. Coarser outer layers trap larger gel agglomerates while fine inner layers enforce precise cut-off accuracy.
Modern candle filter cartridges use CFD flow simulation to optimize pleat geometry, spacing, and inner core perforated hole distribution, eliminating dead zones and minimizing polymer residence time degradation.
Addressing common technical inquiries from filtration engineers and procurement professionals.
Cylindrical smooth candle filters consist of a plain cylindrical filter medium around a central core. They are simpler to clean but have less surface area. Pleated candle filters feature folded (corrugated) filter media, providing 2 to 4.5 times more surface area within the same outer dimensions. Pleated cartridges are ideal for high flow rates, high-viscosity melts, and applications requiring extended operational lifespan between cleaning cycles.
Sintered metal fiber fleece (felt) offers high porosity (up to 80%) and 3D depth filtration, providing high dirt-holding capacity and lower pressure drop—making it the top choice for fine polymer melt filtration (3 to 40 μm). Woven wire mesh provides precise 2D surface filtration with rigid aperture size, making it ideal for higher micron ratings (40 to 250 μm), easy surface cleaning, and heavy particulate recycling applications.
With proper cleaning procedures—such as vacuum pyrolysis, TEG solvent bath, controlled chemical passivations, and ultrasonic flushing—high-quality 316L sintered candle filter cartridges can typically be cleaned 15 to 25 times without degrading structural strength or filtration efficiency. Regular bubble point testing post-cleaning is recommended to verify filter integrity.
Yes, we specialize in OEM/ODM reverse engineering and custom manufacturing. You can provide technical drawings, physical sample elements, or housing connection dimensions (including thread pitch, tie-rod style, or hexagonal adapter interfaces). We manufacture 100% dimensionally interchangeable candle filter cartridges compatible with major international CPF systems.
Standard custom samples or small batch OEM orders are typically manufactured within 10 to 15 business days. Full batch container exports require approximately 20 to 30 days depending on raw alloy availability and special testing requirements. Air freight fast-track options are available for urgent plant maintenance shutdowns.
Review additional specialized candle elements, screen mesh assemblies, and recycling system components direct from our factory.
