Explore our top-tier OEM/ODM candle filter cartridges, wire mesh screens, and leaf disc filter elements engineered for extreme temperatures and high differential pressures.
In high-temperature polymer processing, melt filtration is far more than simple particle sieving—it is an intricate thermodynamic and fluid dynamic process governing melt purity, molecular stability, and downstream equipment protection.
Molten polymers—such as PET, PA66, PP, and PE—exhibit pronounced non-Newtonian shear-thinning behavior under extrusion pressures ranging from 100 bar to 250 bar. Standard wire meshes frequently suffer from gel extrusion and localized shear spikes, degrading the polymer backbone. Pujiang HG's engineered candle filters utilize gradient-porosity sintered metal fiber structures that optimize hydraulic flow paths, ensuring uniform shear distribution and preventing thermal degradation during long continuous production runs.
Unlike rigid inorganic contaminants (such as silica, metal specks, or catalyst residues), semi-solid organic gels deform under high pressure drop (ΔP) and migrate through traditional single-layer screens. Our multi-layered sintered fiber media features a three-dimensional depth filtration matrix. This structure traps deformable gels through tortuous flow channels and depth interception, protecting spinnerets and thin-film dies from premature clogging.
Maintaining a low initial pressure drop while extending the dirty pressure drop limit is vital for continuous melt processing. Pujiang HG's SUS 316L sintered candle filter elements provide up to 85% void volume, offering 3x to 5x higher dirt holding capacity compared to standard woven mesh filters. This extends continuous production cycles from 30 days to over 120 days before thermal pyrolytic cleaning is required.
| Filtration Media Type | Porosity / Void Volume | Gel Capture Efficiency | Differential Pressure (ΔP) | Primary Industrial Application |
|---|---|---|---|---|
| Sintered Metal Fiber Felt | 75% - 85% | Very High (Depth Matrix) | Exceptionally Low | BOPET / BOPP Film, Synthetic Fiber Spinning |
| Multi-Layer Sintered Wire Mesh | 50% - 65% | Moderate to High | Low to Medium | High-Pressure Polymer Extrusion, Screen Changers |
| Dutch Woven Wire Mesh (SUS 304) | 35% - 45% | Low (Surface Only) | Medium to High | Plastic Recycling Pelletizing, Masterbatch Lines |
| Sintered Metal Powder Media | 40% - 50% | High (Rigid Particles) | High | Specialty Chemical Monomers & Gas Filtration |
The global polymer melt filtration market is experiencing unprecedented demand driven by the explosion of Post-Consumer Recyclate (PCR) integration, ultra-thin battery separator film manufacturing, and high-tenacity synthetic fiber production.
Global environmental regulations (such as EU packaging directives requiring 30%+ recycled content by 2030) force compounders to process heavily contaminated recycled resins. Advanced candle and leaf disc filters enable continuous filtration of rPET, rHDPE, and rPP without frequent line shutdowns, effectively handling volatile contaminant loads.
Lithium-ion battery separator films (PE/PP wet process) and ultra-thin capacitor films require sub-micron particle control down to 3µm. A single pinhole contaminant can ruin entire master rolls. Pujiang HG’s precision-engineered leaf disc filters ensure strict quality control for top battery manufacturers globally.
In high-speed PET/PA6 spunbond nonwoven lines and tire cord spinning (running at speeds over 6,000 m/min), filter medium stability directly impacts yarn tensile strength. Our SUS 316L candle elements prevent filament snap and reduce costly downtime in automated spinning plants across North America, Europe, and Asia.
Pujiang HG Plastic Machinery Co., Ltd. integrates advanced powder metallurgy, high-vacuum diffusion sintering, and automated precision pleating to produce industrial filter elements with high mechanical structural integrity.
Our filter media undergo high-vacuum solid-state diffusion bonding at temperatures up to 1,200°C. This metallurgical process welds wire crossover points and metal fibers together at the atomic level without using chemical binders. The resulting matrix eliminates media migration, guaranteeing consistent pore geometry even under violent pressure surges up to 210 bar.
While standard SUS 304 offers reliable cost efficiency for basic polyolefin extrusion (PE/PP), high-temperature polyester (PET) and polyamide (PA) processing require low-carbon SUS 316L to prevent intergranular corrosion caused by organic acids at 300°C+. For aggressive fluoropolymers (PTFE, PVDF) and corrosive monomer recovery, we manufacture custom elements from Hastelloy C-276 or Inconel 600.
Figure 1: Multi-layer depth filtration structure optimized for low hydraulic resistance, maximum dirt retention capacity, and high collapse strength during reverse backwashing.
Our custom polymer filter elements and recycling machine lines are operating in production environments across 80+ countries. Below are primary industrial integration scenarios.
Equipment Setup: Continuous Duplex Candle Filter Housings & Leaf Disc Systems.
Challenge: Micro-gel specks causing film tears during high-speed biaxial orientation stretching.
Solution: 10µm SUS 316L Sintered Fiber Felt Candle Cartridges with smooth flow distribution hubs to minimize polymer residence time.
Equipment Setup: Spinning Pack Filters & CPF Candle Assemblies.
Challenge: Frequent nozzle clogging leading to yarn breakages and uneven filament denier.
Solution: Custom gradient-pore candle elements delivering sub-micron retention efficiency, extending pack life by over 40%.
Equipment Setup: Continuous Hydraulic Screen Changers & Extrusion Mesh Discs.
Challenge: High dirt loads from agricultural film, bottle flakes, and urban plastic waste.
Solution: Heavy-duty spot-welded multi-layer mesh packs combined with HG Plastic Recycling Washing & Granulating lines.
Pujiang HG Plastic Machinery Co., Ltd. strictly complies with international quality standards, providing direct factory support, rapid custom prototyping, and full supply chain traceability for global OEMs.
We offer end-to-end customization services for global machinery builders and plant managers. Whether you require custom adapter fittings (threaded M28/M42, bayonet, smooth, or NPT), modified pleat counts, or private-label distributor packaging, our engineering team delivers CAD/FEA-validated samples within 7–10 working days.
Pujiang HG continues to invest in cutting-edge R&D to meet the evolving demands of next-generation polymer science, micro-recycling, and ultra-high purity applications.
Embedding pressure, temperature, and acoustic emission sensors into filter housings to predict gel breakthrough and automate screen changes.
Developing 0.5µm–2µm metallic fiber matrices for optical-grade polycarbonate, display films, and medical polymer extrusion lines.
Optimizing surface passivation and alloy coatings to allow 15+ ultrasonic/TEG cleaning cycles without structural degradation.
Implementing closed-loop recycling programs for spent stainless steel filter elements, lowering carbon footprints for global partners.
Find expert answers to common engineering, selection, maintenance, and purchasing questions regarding polymer candle filters and screen mesh media.
Browse our full lineup of OEM/ODM candle elements, extrusion screen mesh packs, and leaf disc assemblies direct from our factory in Zhejiang, China.
