Explore our core range of high-efficiency candle filters, leaf discs, extruder screens, and plastic pelletizing equipment engineered for zero-defect continuous production.
Engineered for extreme pressure melt filtration, offering deep dirt capacity and high structural integrity.
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Ensures gel-free filament spinning for high-speed continuous PP/PET spunbond nonwoven manufacturing lines.
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Custom micron ratings (3μm to 100μm) crafted with SUS 316L sintered metal felt for maximum chemical resistance.
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Optimized pleat geometry delivers 300% expanded surface area for long operational life cycles under high thermal stress.
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Heavy-duty granulating system turning post-industrial & post-consumer plastic waste into high-purity polymer pellets.
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Precision multi-layer mesh construction ensures stable filtration efficiency and excellent ultrasonic cleanability.
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Tailored Continuous Polymer Filtration (CPF) candles engineered to seamlessly fit OEM filter housing systems worldwide.
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Hard-hub & soft-hub leaf discs engineered for BOPP/BOPET packaging film production with minimal pressure drop.
View Product SpecsUnderstanding non-Newtonian polymer behavior under extreme pressure differential (ΔP) to maximize continuous extrusion line efficiency.
In modern polymer processing—ranging from high-speed BOPP packaging films to medical-grade PA spunbond nonwovens—the molten polymer behaves as a viscoelastic fluid exhibiting pronounced shear-thinning characteristics. When forcing high-viscosity melts through filtration media at operating temperatures up to 350°C and pressures exceeding 250 bar, solid contaminants and soft degradation gels present drastically different filtration dynamics.
Rigid particulates (such as degraded cross-linked polymers, catalyst residues, and metal scales) are captured via direct physical straining. However, semi-solid "soft gels" tend to elongate under high shear stress gradient, migrating through conventional woven wire meshes over time. Pujiang HG's OEM leaf disc filter elements utilize a depth-structure gradient matrix combining micro-denier sintered SS316L fiber felts, creating an intricate 3D labyrinth that traps deformable gels via multi-stage hydraulic deceleration without triggering excessive pressure drop spike.
Dead spots in filter housing lead to thermal degradation, carbonization, and continuous defect release into film extrusion channels.
Precision sintered metal filter media specs designed for high torque, dynamic sealing, and ultrasonic cleanability.
Engineered with heavy-duty precision CNC-machined SS316L inner hubs featuring keyway splines. Designed to endure high axial torque and crush forces during filter pack assembly without structural distortion. Ideal for continuous polymer filtration (CPF) housings operating at elevated delta pressures.
Incorporates dynamic metallic sealing lips that deform slightly under tie-rod tension. Creates an impenetrable metal-to-metal seal between adjacent filter discs, eliminating polymer bypass risk even under fluctuating melt temperatures.
Formed by vacuum sintering non-woven SS316L metallic fibers into a uniform porous matrix. Delivers volumetric porosity up to 85%, offering 3x higher dirt-holding capacity (DHC) compared to simple woven wire screens.
| Filter Media Configuration | Standard Absolute Micron Rating | Porosity (%) | Gel Retention Capability | Dirt Holding Capacity | Max Allowable ΔP |
|---|---|---|---|---|---|
| Sintered Metal Fiber Felt (SS316L) | 3 μm - 60 μm | 75% - 85% | Exceptional (Depth Effect) | High (3.5x Standard) | Up to 210 bar |
| 5-Layer Sintered Wire Mesh | 5 μm - 150 μm | 35% - 50% | Moderate (Surface & Pore) | Medium (1.8x Standard) | Up to 250 bar |
| Standard Square Woven Wire Mesh | 20 μm - 250 μm | 30% - 40% | Low (Sieve Action Only) | Baseline (1.0x) | Up to 150 bar |
| Dutch Weave Sintered Screen Pack | 10 μm - 100 μm | 40% - 55% | Good (Rigid Particulates) | Medium (2.0x Standard) | Up to 200 bar |
How advanced melt filtration enables high-ratio PCR/PIR processing while safeguarding film clarity and tensile strength.
With strict global regulations demanding increased percentages of post-consumer recycled (PCR) materials in rigid packaging, flexible BOPP films, and synthetic fibers, polymer manufacturers face unprecedented contamination challenges. Recycled melt streams contain high levels of heterogeneous impurities, cross-polymers, paper fibers, aluminum trace dust, and organic degradation products.
Standard screen changers fail rapidly under heavy contamination loads, causing frequent line shutdowns and severe pressure surges. Pujiang HG's engineered OEM Leaf Disc systems integrate multi-layer depth filtration media capable of sustaining high dirt loading while maintaining exact nominal micron retention. By optimizing initial differential pressure and extending pack change intervals by up to 350%, our filtration solutions directly lower Total Cost of Ownership (TCO) across recycling and compounding facilities worldwide.
*Data based on 50% rPET bottle flake melt extrusion line at 3,500 kg/hr throughput rate. Extended service life directly translates into over $150,000 annual downtime savings per line.
Established in Zhejiang, China, Pujiang HG Plastic Machinery Co., Ltd. has spent over two decades establishing itself as a premier manufacturer of high-precision polymer filtration systems, candle filter cartridges, leaf discs, stainless steel screen meshes, and full-scale plastic recycling machinery.
Equipped with state-of-the-art vacuum sintering furnaces, high-precision CNC hub machining centers, automated laser seam welding, and ISO 4003 bubble-point testing stations, our facility ensures that every filter element strictly adheres to international quality standards. We deliver complete OEM & ODM customization, tailoring filter dimensions, absolute micron ratings, media metallurgy, and hub locking interfaces to exact customer equipment specifications.
Engineered filter elements tailored for film manufacturing, fiber extrusion, chemical filtration, and plastic waste recycling.
Pujiang HG Leaf Disc Filters feature optimized sector geometry providing uniform flow distribution across the entire disc radius. Engineered for BOPP, BOPET, and BOPA film orientation lines, these elements guarantee gel-free melt output and low pressure drop accumulation.
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High-temperature and high-pressure candle filter elements utilizing cylindrical or pleated stainless steel sintered mesh and metal fiber felt. Perfect for continuous polymer filtration (CPF) units in polyester, nylon, and polypropylene spinning plants.
Explore Candle FiltersSuperior quality stainless steel wire mesh screen packs, continuous ribbon belt filters, and circular extruder screens. Fabricated with tight weave tolerance to prevent wire displacement under extreme melt flow velocity.
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Complete turnkey plastic recycling solutions: heavy-duty crushers, friction washing units, centrifugal dryers, and extrusion pelletizing equipment engineered for PP film, PE agricultural film, and PET bottle flakes.
Explore Recycling MachinesTailored filtration solutions operational across demanding global processing environments.
In single-screw and twin-screw extrusion compounding, molten polymer contains un-melted gels and carbon deposits. Our stainless steel screen mesh filters and leaf discs guarantee stable pressure upstream of the die head, protecting melt pumps and preventing film breakages.
Biaxially oriented films require ultra-pure polymer melts. Microscopic gel particles cause optical haze and tear lines during high-speed transverse stretching. Pujiang HG leaf disc filter stacks deliver absolute micron ratings from 5μm to 20μm, ensuring optical transparency.
For polyester (PET) and polyamide (PA6/PA66) filament yarn and spunbond nonwovens, spinneret nozzle clogging causes costly thread breaks. Candle filter cartridges manufactured with sintered metal fiber felt maximize dirt retention while operating at temperatures above 300°C.
High-purity liquid monomer filtration, resin polymerization lines, and hot melt adhesive clarification demand rugged, corrosion-resistant SS316L sintered metal filter elements that withstand aggressive solvent wash procedures and severe hydraulic shocks.
Standardized five-stage cleaning workflow to restore 100% flow permeability and extend filter element longevity.
Spent leaf discs are placed in a vacuum calcination furnace at 450°C under controlled nitrogen atmosphere. Residual polymers (PET, PP, PE) undergo thermal degradation into gaseous monomers without oxidizing the metallic SS316L structure.
For polyester resins, elements undergo a Triethylene Glycol (TEG) boiling wash at 285°C to dissolve microscopic residual gel clusters embedded deep within the interior metal fiber matrix.
Immersed in multi-frequency ultrasonic baths containing mild alkaline and citric acid solutions. Cavitation micro-jets dislodge stubborn carbonized particulates from interstitial pore spaces.
Deionized water and filtered compressed air are flushed in reverse direction (inside-out) at 100 bar dynamic pulse pressure, discharging trapped particulate matter.
Cleaned discs undergo ISO 4003 bubble-point testing to measure first bubble pressure and confirm structural integrity, ensuring absolute micron retention before returning to production.
Pujiang HG R&D initiatives shaping the future of intelligent and low-carbon industrial filtration.
Embedding micro-strain gauge sensors into hard-hub structures to provide real-time axial pressure deformation metrics, predicting pack saturation hours before pressure spikes occur.
Utilizing selective laser melting (SLM) metal 3D printing to create gradient drainage channels with non-linear helical paths, reducing melt shear stress by an additional 18%.
Applying atomic layer deposition (ALD) nano-ceramic and DLC (Diamond-Like Carbon) coatings to stainless steel fibers to eliminate sticky polymer adhesion during thermal pyrolytic cleaning.
Deepen your technical expertise with insights from our engineering team.
Discover how high-porosity sintered candle filter elements eliminate spinneret nozzle clogging, maintaining uniform denier consistency during high-speed PP filament spinning.
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Key metallurgical metrics, absolute micron selection, housing compatibility criteria, and cost-benefit evaluations for industrial procurement managers.
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An operational review of sintered stainless steel candle filters across petrochemical monomer purification, BOPET film lines, and recycled resin compounding.
Read Case AnalysisExpert engineering answers addressing critical purchasing, operational, and maintenance inquiries.
Leaf disc filters provide significantly larger effective filtration area within a compact axial housing footprint compared to cylindrical candle filters. Disc geometry allows precise control over radial fluid velocity and residence time distribution (RTD), making leaf discs the industry standard for flat die extrusion lines such as BOPP, BOPET, and BOPA film manufacturing. Candle filter cartridges, on the other hand, offer higher mechanical strength under extreme hydraulic shocks, rendering them ideal for vertical continuous polymer filtration (CPF) systems in synthetic fiber spinning plants.
For premium optical grade BOPET film (used in solar backsheets and display screens), we recommend absolute filtration ratings between 5μm and 10μm utilizing 316L sintered metal fiber felt to trap micro-gels. For recycled PET bottle flake compounding, a nominal rating of 40μm to 75μm using multi-layer sintered wire mesh is recommended to maximize dirt-holding capacity while protecting downstream melt pumps from rigid metallic grit.
When following our standardized 5-stage regeneration protocol (Vacuum Calcination -> TEG Hydrolysis -> Ultrasonic Bath -> High-Pressure Backwash), our SS316L leaf disc filter elements can undergo 15 to 20 full cleaning cycles without degrading bubble-point efficiency or structural pressure tolerance.
We require: (1) Outer diameter (OD) and inner hub diameter (ID); (2) Required nominal or absolute micron rating; (3) Operating temperature and max delta pressure (ΔP); (4) Polymer type (PET, PP, PE, PA, PEEK); and (5) Hub connection preference (Hard-hub keyway or Soft-hub seal ring).
Browse our complete export catalog of polymer candle filter cartridges, screen meshes, and pelletizing machinery solutions.
Heavy-duty stainless steel filter elements engineered for continuous polymer clarification and minimal flow resistance.
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High-output extrusion granulator designed to transform washed plastic waste into uniform, high-density pellets.
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Precision pleated filter cartridge ensuring gel-free extrusion in high-speed optical film production lines.
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Robust SUS 304/316L continuous filtration elements resisting collapse under pressure differentials up to 250 bar.
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Trusted by international extrusion OEMs for superior corrosion resistance and consistent bubble point integrity.
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Engineered disc geometry delivering uniform melt distribution and minimal residence time variance for film lines.
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High-porosity metallic filter packs engineered to maximize operational hours between backwash cleaning cycles.
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Fully customizable length, flange end-cap connection, and micron rating designed to fit standard CPF filter housings.
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