Explore our flagship OEM & wholesale polymer filter elements engineered for low differential pressure, ultra-high strength, and extended on-stream lifecycle.
Understanding Fluid Rheology, Shear Stress Minimization, and Continuous Filtration Kinetics in High-Viscosity Polymer Melt Networks.
In modern high-speed plastic extrusion, synthetic fiber spinning, and biaxially oriented film manufacturing (BOPP, BOPET, BOPA), the purity of the polymer melt directly governs line productivity, tensile strength, and optical transparency. Polymer Disc Filters (commonly structured as circular leaf discs assembled along a central collector shaft inside continuous screen changers) represent the gold standard in high-surface-area filtration.
Operating under extreme physical environments—temperatures reaching 350°C, operating pressures exceeding 250 bar, and dynamic viscosities ranging from 100 to over 10,000 Pa·s—polymer disc filters must maintain structural integrity while entrapping microscopic contaminants, un-melted gels, degraded carbonaceous particles, and inorganic foreign matter without inducing excessive shear degradation or pressure drops ($\Delta P$).
Advanced porous metals, asymmetric sintered fiber structures, and next-generation surface functionalization.
Utilizes non-woven stainless steel fibers (diameter down to 2 µm) vacuum-sintered into a high-porosity matrix (up to 85% void volume). Delivers 3x longer dirt-holding capacity compared to traditional wire mesh.
Precision-machined internal spline hubs in hard-rim disc designs prevent cross-talk leakage under ultra-high shear forces, ensuring rigid axial stacking and zero bypass in continuous leaf disc housings.
Emerging nano-scale surface treatments coat porous sintered structures with inert ceramic or anti-fouling layers, reducing friction factors, gel adhesion, and polymer dwell-time degradation.
Multi-layered depth structures (coarse pre-filtration layer downstream to fine absolute micron layer) capture larger particulate contaminants without blinding the fine micro-porous matrix prematurely.
For highly corrosive fluoropolymers (PTFE, PVDF) and acidic polymer melts, disc elements fabricated from Hastelloy C-276 or Inconel 625 exhibit zero halide pitting corrosion under extreme thermal profiles.
Engineered for up to 20+ cleaning cycles via TEG (Triethylene Glycol) boiling, vacuum calcination furnaces, and high-frequency ultrasonic cavitation, dramatically lowering lifetime consumables expenditure.
Selecting the optimal filter media configuration based on target polymer rheology, contamination profile, and operational pressure limits.
Different industrial applications present distinct filtration challenges. For example, in BOPP/BOPET film production lines, a single gel-particle pinhole can cause a line break on a 500 m/min continuous stretcher. Conversely, in recycled plastics granulating lines (PCR/PIR), the filter must handle high solid dirt loads (paper fibers, aluminum flakes, oxidized polymer inclusions) without blinding immediately.
| Filtration Media Type | Porosity Range | Dirt Holding Capacity | Flow Resistance ($\Delta P$) | Primary Industrial Application | Regeneration Life |
|---|---|---|---|---|---|
| Sintered Metal Fiber Felt | 75% - 85% | Ultra-High (3x Baseline) | Low | BOPP/BOPET Film, Spunbond Nonwovens | 15 - 25 Cycles |
| Multi-Layer Woven Wire Mesh | 35% - 50% | Medium | Moderate | Standard Extrusion, Masterbatch Granulation | 8 - 12 Cycles |
| Sintered Metal Powder Discs | 40% - 55% | High (Depth Retention) | High | Melt Spinning Fine Monofilaments, Resin Refining | 10 - 18 Cycles |
| Square Mesh Extruder Screens | 30% - 45% | Low - Single Pass | Moderate - High | Waste Plastic Recycling, Pelletizing Lines | Disposable / Single Use |
Combining automated laser welding, ISO cleanroom assembly, and quantitative bubble point integrity verification.
Eliminates structural weak points along the outer rim and inner hub joints. Every seam undergoes automatic visual AI inspection to guarantee zero burn-through and uniform thermal expansion compatibility.
100% of manufactured filter elements undergo bubble point testing to verify maximum pore size (Pore Size Distribution) and confirm zero structural defects prior to cleanroom vacuum packaging.
By integrating raw material wire drawing, weaving, vacuum sintering, and precision machining under one roof in Zhejiang, China, we offer global buyers 25%–40% cost efficiency without sacrificing quality standards.
Key technical evaluation criteria for plant directors, procurement managers, and OEM equipment integrators.
When sourcing polymer disc filters and candle filter elements at scale, international buyers must look beyond initial unit purchase prices. A comprehensive Total Cost of Ownership (TCO) evaluation framework takes into account:
Verification of internal hub spline tooth profiles (e.g., 12-tooth, 16-tooth, or smooth keyway hub designs), inner/outer diameter tolerances ($\pm0.1\text{ mm}$), and compatibility with major European and American continuous screen changer housings (such as Maag, Nordson Kreyenborg, Gneuss, and PSI).
Designing internal drainage mesh geometry to prevent stagnant flow zones. Smooth internal flow channels minimize melt dwell time, preventing thermal degradation of heat-sensitive polymers like PET, PA66, or PVC.
Filter elements must withstand sudden pressure spikes caused by cold start-ups or severe contamination surges. Standard HG disc filters feature structural collapse ratings of 210 bar to 250 bar differential pressure.
Full regulatory compliance, material traceability, and dedicated global technical field service.
Pujiang HG Plastic Machinery Co., Ltd. operates under strict quality management systems certified to ISO 9001:2015 standards. Every batch of stainless steel wire, sintered metal felt, and complete disc assembly is accompanied by complete material traceability documentation:
Expert engineering answers regarding polymer disc filter selection, operation, and maintenance.
Hard-rim leaf discs feature a solid precision-machined outer ring and inner hub welded directly to the filtration mesh. This rigid structure tolerates extreme mechanical compression and high differential pressures ($\Delta P > 150\text{ bar}$) without deformation. Soft-rim discs utilize folded mesh edges sealed by outer spot welding, offering a lighter weight and cost-effective alternative for lower pressure processing lines.
Sintered metal fiber felt consists of randomly laid 3D micro-fibers bonded at intersection points via high-temperature vacuum sintering. This creates an open matrix with up to 85% porosity (compared to 35-50% in wire mesh), providing up to 3 times the dirt-holding capacity, significantly lower initial pressure drop, and gentler shear distribution across the polymer melt.
Depending on the polymer type and contaminant nature, high-quality SUS 316L sintered metal fiber leaf discs can be regenerated 15 to 25 times. Standard cleaning protocols include Triethylene Glycol (TEG) liquid phase boiling to dissolve polyester/polyamide resins, followed by vacuum pyrolysis calcination and high-frequency ultrasonic baths to flush out inorganic ash residues.
Yes. HG specializes in OEM/ODM engineering. We manufacture leaf disc filters fully compatible with major screen changer manufacturers including Maag, Nordson Kreyenborg, Gneuss, PSI, and Kobelco. We can reverse-engineer specifications directly from client sample discs or detailed technical drawings.
Gel breakdown typically occurs when local shear stress across the filter media exceeds the viscoelastic threshold of the soft polymer gel, causing it to elongate and squeeze through microscopic pores. Using thicker depth-filtration sintered metal fiber media reduces local fluid velocity ($\text{cm/min}$) and shear rates, capturing deformable gels far more effectively than single-layer wire screens.
HG provides free sample testing for standard mesh specifications prior to bulk orders. Custom hard-rim disc samples typically ship within 7 to 12 working days. Full production wholesale orders are delivered within 15 to 25 days depending on total quantity and specialized metallurgical testing requirements.
Browse our expanded export series of extruder screen mesh filters, candle cartridges, and plastic recycling machinery.
