Explore our top-tier precision-engineered melt filter elements designed for high temperature, high pressure, and maximum dirt-holding capacity across global polymer processing plants.
Continuous melt filtration operates under extreme thermal regimes (up to 380°C) and hydraulic pressures (up to 350 bar). A custom candle filter pack is designed to eliminate rheological stagnant zones while maintaining low differential pressure ($\Delta P$) curves.
The structural backbone consists of precision-drilled or spiral-wound heavy-gauge stainless steel tubing (SUS 316L/304). It withstands high collapse pressures up to 210 bar differential pressure, ensuring internal flow channels remain open even under high gel-load spikes.
Utilizing graded multi-layer woven wire mesh or vacuum-sintered metal fiber felt. Fiber felt provides 3D depth filtration with up to 85% porosity, multiplying dirt-holding capacity (DHC) by 3x to 5x compared to standard surface-layer wire screens.
Custom CNC end caps featuring NPT, hexagonal, bayonet, or threaded M24/M30 interfaces. Machined to micro-inch tolerances to ensure zero-leakage static sealing inside continuous polymer filter housings (CPF).
In high-viscosity polymer processing (viscosities between 1,000 to 50,000 Pa·s), selecting between cylindrical and pleated media dictates operational efficiency. Pleated candle cartridges increase effective filtration surface area by 200% to 400% within identical housing vessel dimensions. This drastically lowers fluid velocity through media pores, reduces shear-induced polymer degradation, and extends stream service life between cleaning cycles.
| Performance Parameter | Cylindrical Sintered Candle | Pleated Sintered Mesh Pack | Sintered Metal Fiber Felt Pack |
|---|---|---|---|
| Filtration Rating Range ($\mu m$) | 10 – 250 $\mu m$ | 5 – 100 $\mu m$ | 3 – 60 $\mu m$ (Ultra-fine) |
| Effective Flow Area per Unit | 1.0x (Baseline) | 2.5x – 4.0x Expansion | 3.0x – 4.5x Surface + Depth Area |
| Porosity Percentage (%) | 35% – 45% | 40% – 50% | 75% – 85% (High Void Volume) |
| Dirt Holding Capacity (DHC) | Standard Depth | Medium Surface DHC | Maximum 3D Depth DHC |
| Maximum Collapse Pressure | 210 bar | 120 – 150 bar | 180 – 210 bar |
| Regenerability / Cleanability | Excellent (15–20 cycles) | Good (8–12 cycles) | Superior (12–18 cycles) |
From virgin polymer synthesis to post-consumer mechanical recycling, custom candle filter packs protect delicate downstream machinery such as melt pumps, spinnerets, slot dies, and pelletizers.
In PET, PA6, PA66, PP, and PC polymerization plants, candle filter packs extract catalyst residues, degraded oligomers, and carbonized gels, guaranteeing optical purity and uniform intrinsic viscosity (IV).
Ultra-thin biaxially oriented film production lines demand zero micro-defects. Custom pleated candle cartridges rated at 3 to 10 microns prevent film breakage and micro-pinhole formations across high-speed webs.
In Spunbond, Meltblown, POY, and FDY fiber lines, our candle elements shield spinneret pack capillaries ($100-300\mu m$) against blockages, reducing filament breakage rates to less than 0.01%.
Engineered to handle extreme viscosity fluid streams up to 50,000 Pa·s. Reinforced inner cores prevent element collapsing during high differential pressure shocks during cold-start operations.
Heavy-duty filtration packs engineered to capture metal fines, paper fibers, and unsintered rubbers from recycled PE, PP, and PET pelletizing lines, extending breaker plate life.
Beyond polymers, candle packs serve in high-temperature liquid catalyst recovery, aggressive solvent filtration, and hot gas particulate removal up to 600°C in chemical reactors.
Our custom manufacturing protocols ensure each candle filter element delivers verifiable performance under continuous plant operations.
As global polymer manufacturing transitions toward sustainable bioplastics, high-content PCR recycling, and ultra-thin battery separator films, melt filtration media engineering must evolve dynamically.
Development of ultra-fine stainless steel and nickel alloy fiber felts with pore distributions optimized down to 1.0 micron absolute. Advanced multi-gradient density layering increases dirt-holding capacity by an additional 40% while preventing surface blinding during processing of biopolymers like PLA and PHA.
Integrating 3D Computational Fluid Dynamics (CFD) into end-fitting and internal drainage core geometric design. By simulating non-Newtonian shear rate distributions, customized flow channels eliminate polymer residence hot-spots, stopping thermal gel degradation before it occurs.
Pioneering closed-loop, automated ultrasonic cavitation paired with fluid bed pyrolysis systems. Next-generation candle filter packs will support up to 30 full thermal recovery cycles with zero metallurgical degradation, significantly advancing circular industrial sustainability.
Situated in Pujiang County, Jinhua City, Zhejiang Province, Pujiang HG Plastic Machinery Co., Ltd. combines over two decades of metallurgical filtration engineering with state-of-the-art automated production lines.
Our high-vacuum sintering furnaces bind stainless wire mesh and metal fiber matrices at controlled thermal curves, eliminating oxidation and guaranteeing diffusion bonding strength without altering parent metal properties.
Robotic TIG and seam laser welding units ensure continuous, crevice-free joint seams between the filter element cylinder and end caps. Eliminates melt bypass risks and withstands severe torque and hydraulic pressures.
Every production batch undergoes 100% Bubble Point Testing according to ISO 4003 to verify pore size integrity, along with ISO 3968 flow resistance pressure drop validation prior to packaging.
For procurement directors and plant engineers, substituting legacy OEM candle filters requires balancing capital expenditure against total operational cost per ton of polymer output.
$$TCO = C_{initial} + C_{energy}(\Delta P) + C_{downtime} + C_{regeneration} - V_{salvage}$$
By optimizing free flow area and porosity in custom candle packs, HG filter elements reduce initial differential pressure ($\Delta P$) by 15-25%. This translates directly into lower extruder drive motor energy consumption ($C_{energy}$) and significantly extends on-stream runtime before screen changeover is required.
Provide us with a used sample, CAD drawing, or housing dimension. Our engineering team conducts 3D laser scanning and alloy spectrographic analysis to produce drop-in replacement elements within 48 hours.
By eliminating overseas middle-man trading margins, our direct-from-factory business model delivers high-precision OEM-grade filter packs at 30% to 50% cost savings compared to European or North American suppliers.
Shipped in VCI anti-corrosion vacuum bags housed inside heavy-duty custom wooden crates. We provide emergency express air dispatch for critical plant breakdown scenarios globally.
Pujiang HG Plastic Machinery provides complete material traceability and international engineering compliance to guarantee smooth integration into global plant assets.
| Compliance Standard | Certification Authority / Protocol | Application & Assurance Scope |
|---|---|---|
| ISO 9001:2015 | Quality Management Systems | Comprehensive factory audit compliance covering raw material receiving, CNC machining, welding, and final bubble point testing. |
| EN 10204 3.1 MTR | Mill Test Certificate Traceability | Full chemical heat-lot analysis and mechanical property validation for SUS304, SUS316L, SUS310S, and Hastelloy raw materials. |
| CE PED (2014/68/EU) | Pressure Equipment Directive | Engineering alignment for pressure-containing filter elements operating within European Union chemical and polymer processing units. |
| REACH & RoHS | Environmental Chemical Standards | Ensures zero hazardous heavy metal contamination, suitable for food-contact polymer grades (PET water bottles, food packaging film). |
Detailed technical answers to common questions asked by procurement managers, process engineers, and plant maintenance directors.
Discover our extended line of OEM/ODM polymer candle filter cartridges, leaf disc filters, high-viscosity elements, and continuous plastic granulating machinery.
