High-durability OEM/ODM melt filtration elements designed for ultra-low pressure drop, zero degradation, and long operational cycles under extreme temperatures and pressures.
In modern industrial extrusion, continuous polymerization, and synthetic fiber manufacturing, the continuous removal of hard contaminants, micro-gels, carbonized degradation particles, and metallic debris from high-viscosity polymer melts is vital to operational profitability. As an authority in polymer melt filtration systems, Pujiang HG Plastic Machinery Co., Ltd. develops engineered stainless steel candle filter elements, leaf disc filters, and wire mesh filtration media designed to handle non-Newtonian fluid dynamics under high temperature (up to 350°C) and extreme operational pressure (up to 300 bar).
Polymer melts such as Polyethylene Terephthalate (PET), Polypropylene (PP), Polyamide (Nylon 6 / PA66), Polystyrene (PS), and Polycarbonate (PC) exhibit high pseudoplastic viscosity. Under standard extrusion shear rates, non-uniform melt flow through improperly engineered filtration media creates stagnant zones—commonly known as dead spots—where thermal degradation occurs, forming insoluble micro-gels. Our custom polymer melt filter elements utilize computational fluid dynamics (CFD) optimized porous geometry. By maintaining precise internal fluid velocity gradient and minimal initial differential pressure ($\Delta P$), our filters protect sensitive spinnerets, film extrusion dies, and downstream melt pumps from catastrophic damage while eliminating melt fracture and flow instabilities.
Extremely fine, deformable cross-linked gel particles often pass through loose wire mesh. Our sintered metal fiber felts utilize a 3D random matrix that traps gels via depth retention and controlled shear dispersion.
Pleated candle structures expand the active filtration surface area up to 800% compared to cylindrical equivalents, dramatically reducing initial pressure drops and extending overall filtration life cycles.
Engineered with perforated heavy-duty inner cores and SUS 316L support meshes, our filter cartridges withstand differential pressure surges up to 210 bar without structural deformation.
The global polymer manufacturing and plastic processing landscape is undergoing a monumental transformation driven by stringent global decarbonization mandates, ESG directives, and the rapidly growing circular economy. Modern extruders are increasingly processing Post-Consumer Recycled (PCR) and Post-Industrial Recycled (PIR) resins. However, PCR melts contain unpredictable contaminant profiles, including cross-contaminated polymers, printing inks, paper fibers, aluminum flakes, and degraded rubber particles.
To overcome these challenges, global plastic recyclers and resin manufacturers rely on high-capacity continuous melt filtration systems. Conventional single-layer wire screens blind rapidly, leading to constant machine downtime, high labor costs, and significant melt loss during screen changes. Pujiang HG Plastic Machinery provides custom-designed, heavy-duty stainless steel melt candle filters and continuous leaf disc assemblies that offer exceptionally high dirt-holding capacity ($g/m^2$). This enables recycling lines to process challenging recycled feedstocks like post-consumer PE film, PP woven bags, and PET bottle flakes seamlessly.
Concurrently, in the high-purity virgin polymer market, the drive toward ultra-thin flexible packaging films (BOPP/BOPET under 5 microns), optical display films, and high-tenacity industrial fibers (meltblown hygiene nonwovens, tire cord yarns) demands filtration accuracy down to 3–5 absolute microns. Achieving zero defect rates (such as film bubbles, pinholes, or filament breakage) requires absolute metallurgical consistency, uniform pore sizing, and rigorous cleanliness during filter manufacturing.
Explore our standard and custom alloy configurations engineered for severe industrial operating environments.
| Filter Element Type | Filtration Media Material | Absolute Rating ($\mu m$) | Max Temp (°C) | Max $\Delta P$ Collapse (Bar) | Primary Industrial Application |
|---|---|---|---|---|---|
| Pleated Polymer Candle Cartridge | AISI 316L Sintered Metal Fiber Felt / SUS 304 Mesh | 3 - 60 $\mu m$ | 350°C | 210 Bar | PET Continuous Polymerization (CPF), Spunbond Nonwoven, BOPA/BOPET Films |
| Rigid Sintered Wire Mesh Candle | 5-Layer Sintered Wire Cloth (SUS 316L) | 5 - 100 $\mu m$ | 400°C | 150 Bar | High-Viscosity Nylon 6/66 Spinning, Monofilament Extrusion, Resin Synthesis |
| Polymer Leaf Disc Filter (Hard/Soft Hub) | Stainless Steel Sintered Felt / Multi-Layer Woven Wire | 5 - 40 $\mu m$ | 320°C | 175 Bar | BOPP Optical Film Lines, Cast Packaging Film, High-Speed Extrusion Systems |
| Extruder Wire Mesh Screens & Belts | SUS 304 / 316 Plain & Twill Dutch Weave Wire Mesh | 10 - 250 $\mu m$ | 300°C | 50 Bar | Plastic Recycling Pelletizing, Extruder Auto Screen Changers, Blow Molding |
| High-Temperature CPF Candle Filter | Hastelloy C-276 / 316L Metallic Microfiber Matrix | 1 - 25 $\mu m$ | 480°C | 250 Bar | Corrosive Specialty Polymer Synthesis, Fluoropolymer Processing, Petrochemical Refineries |
Customized OEM solutions tailored to specific extrusion equipment layouts and chemical spinning line configurations.
In biaxially oriented film manufacturing (BOPP/BOPET), any hard particulate defect larger than 10 microns can trigger web breaks in the transverse direction (TDO) oven, stopping production for hours. Our high-area leaf disc filters and pleated candle cartridges feature precision hard hubs and multi-layer metallic fiber media that capture gel specks and inorganic fillers, delivering defect-free film surfaces for metallizing and print converting.
High-speed PP spunbond nonwoven lines (such as Reicofil-style machinery) require uninterrupted polymer melt delivery to thousands of capillary holes in the spinneret beam. Blocked capillary holes lead to "drip defects" and uneven web formation. HG Polymer Filter's candle cartridges provide reliable 15–25 micron absolute filtration with uniform radial flow distribution, protecting spinneret packs and extending pack life by over 300%.
In continuous polyester (PET) or nylon (PA6/PA66) staple fiber and POY/FDY yarn production, double-vessel Continuous Polymer Filter (CPF) systems allow online switching of filter elements without stopping melt flow. Our OEM custom candle filters are dimensionally interchangeable with major European standard housings, delivering identical bubble point integrity and micro-fiber porosity at optimized cost structures.
Recycling heavily contaminated agricultural PE films, post-consumer PET bottles, or industrial ABS/PP scrap requires extreme dirt tolerance. Our heavy-duty stainless steel screen mesh belts, circular filter packs, and robust pleated candle cartridges enable recycling plant operators to increase pellet purity, eliminate melt leakage, and reduce screen change frequency by over 40%.
At Pujiang HG Plastic Machinery Co., Ltd., every polymer filter element is manufactured under rigorous ISO 9001:2015 quality management systems. Our stainless steel wire mesh and metal fiber felts strictly comply with international metallurgical standards (AISI 304, 316, 316L, 904L, Hastelloy). Furthermore, our filter products meet European CE directives, RoHS, and REACH requirements, ensuring that no harmful substances migrate into filtered resins—critical for food-contact polymer packaging compliant with US FDA 21 CFR 177.1630 standards.
A major economic benefit of our metallic melt filter elements is their exceptional re-cleanability. Unlike single-use synthetic media, our all-welded stainless steel candle cartridges and leaf discs can undergo multiple cleaning cycles (typically 10 to 20 cycles) using standard industrial polymer removal methods:
As polymer processing moves toward higher throughput, thinner gauge film extrusion, and greater recycled content, Pujiang HG Plastic Machinery continues to invest in advanced filtration technologies:
Multi-tiered fiber matrices that capture larger contaminants on outer layers while keeping inner layers open for fine particle trapping, extending element lifetime by up to 50%.
Collaborating with OEM system integrators to incorporate real-time differential pressure ($\Delta P$) trend monitoring for predictive maintenance and automated backwash cycles.
Expanding production of high-nickel alloy media (Hastelloy C-276, Inconel 600, 904L) for high-temperature corrosive polymer synthesis including PVDF, PTFE, and bio-based PLA resins.
Expert technical insights on selecting, installing, and maintaining custom polymer melt filters.
Direct factory supply from China's premier manufacturer of polymer melt filtration elements and plastic recycling equipment.
