Discover our primary engineering lineup of SUS 304/316L pleated and sintered candle filter elements, designed to optimize pressure drop ($\Delta P$) and eliminate thermal degradation in continuous nonwoven extrusion lines.
In high-speed Spunbond (SB), Meltblown (MB), and SMS (Spunbond-Meltblown-Spunbond) continuous nonwoven fabric manufacturing, polymer melt purity directly dictates fiber diameter consistency, spin-pack longevity, and tensile strength (MD/CD ratio). As an industry-leading OEM nonwoven candle filter supplier and exporter, Pujiang HG Plastic Machinery Co., Ltd. delivers engineered filtration media capable of withstanding extreme mechanical shear, thermal stress up to 340°C, and pressure differentials exceeding 250 bar.
Polypropylene (PP), Polyester (PET), and Polyamide (PA6) melts inherently accumulate cross-linked gels, carbonized particles, and catalyst residues during twin-screw extrusion. Nonwoven candle filters utilize multi-layered 316L sintered metal fiber felt to trap micro-gels through depth filtration, preventing spinneret hole blockage.
Sudden pressure drops and shear variations degrade polymer molecular weight distribution. Our candle filter cartridges engineered with perforated internal support cores stabilize melt rheology, ensuring uniform flow distribution across multi-cavity Continuous Polymer Filtration (CPF) duplex housings.
Constructed from premium AISI 316L stainless steel, nonwoven candle filters withstand multiple offline cleaning cycles—including Triethylene Glycol (TEG) boiling, vacuum calcination furnaces, and ultrasonic solvent baths—reducing long-term operating costs (OpEx) by up to 60%.
The global nonwoven fabrics market—projected to reach $65 Billion by 2030—is driven by surging demand for hygienic products, medical PPE, geotextiles, automotive filtration media, and sustainable bio-polymer nonwovens (PLA/PHA). Procurement directors and plant engineers face mounting pressures regarding raw material variance and high-speed line downtime.
Selecting the correct internal media structure is critical for matching specific nonwoven process conditions:
| Filtration Performance Metric | Sintered 316L Fiber Felt (Recommended) | Multi-Layer Woven Wire Mesh | Sintered Metal Powder Media |
|---|---|---|---|
| Porosity Rate (%) | 75% - 85% (Ultra-High) | 35% - 50% (Medium) | 40% - 50% (Low-Medium) |
| Dirt Holding Capacity (DHC) | Exceptional (Depth Filtration) | Moderate (Surface Filtration) | Low (Rapid Surface Blind) |
| Initial Differential Pressure ($\Delta P_0$) | Very Low (0.5 - 1.2 bar) | Medium (1.5 - 2.5 bar) | High (3.0 - 5.0 bar) |
| Gel Capture Efficiency | > 99.5% at rated micron | ~ 85.0% (Gels deform through mesh) | > 98.0% |
| Cleanability & Cycle Life | 15 - 25 Re-calcination cycles | 10 - 15 Re-calcination cycles | 5 - 8 Cycles (Pores easily clog) |
| Primary Application | Spunbond / Meltblown / PET Filaments | Masterbatch Extrusion / Rough Screens | High-Pressure Gas / Hydraulic Systems |
As an OEM/ODM candle filter specialist, Pujiang HG Plastic Machinery Co., Ltd. custom engineers each element to strict tolerance standards. Our candle filters utilize a tri-layer element architecture engineered for high structural integrity under intense hydraulic load.
By precision-pleating the 316L metal fiber felt media around a perforated stainless steel support tube, we increase the active surface area per candle cartridge by up to 400% relative to smooth cylindrical designs. This dramatically lowers face velocity, reduces polymer shear degradation, and prolongs operational run times.
We provide full retrofitting compatibility for major European, Asian, and American CPF (Continuous Polymer Filtration) housing assemblies:
Nonwoven candle filters operate under tailored conditions depending on the end-use polymer matrix and manufacturing environment. Below are real-world application benchmarks established across international manufacturing hubs.
Operating Environment: Polypropylene melt (MFI 25–40 g/10min) extruded at 230°C–250°C for baby diaper top-sheets and surgical mask media.
Filtration Solution: 15μm – 25μm absolute pleated 316L fiber felt candle filters. Protects spinnerets with 0.12mm–0.20mm hole diameters from micro-gels, extending pack change interval from 14 to 45 days.
Operating Environment: Recycled PET bottle flakes (rPET IV 0.68–0.74 dl/g) operating under aggressive contamination levels and high temperature (285°C–300°C).
Filtration Solution: High-capacity 40μm – 60μm multi-stage sintered depth candle elements. Provides maximum dirt holding capacity to handle PVC/aluminum micro-contaminants in PCR flakes.
Operating Environment: Ultra-high melt flow PP (MFI 1200–1800 g/10min) for N95/N99 meltblown filter webs.
Filtration Solution: 5μm – 10μm absolute precision metal felt candles. Eliminates shot formation (unattenuated polymer droplets) by maintaining zero particle pass-through to micro-die nosepieces.
Pujiang HG Plastic Machinery Co., Ltd. operates an ISO 9001:2015 certified production center equipped with cleanroom assembly zones and non-destructive quality testing units. Every OEM candle filter element undergoes rigorous verification prior to global export.
As the nonwoven industry pivots toward circular bio-polymers, higher recycled content (rPET/rPP), and Industry 4.0 automated plants, candle filter design is undergoing rapid evolutionary shifts.
Development of anti-stick nano-ceramic surface coatings on 316L fiber felt to prevent polymer thermal degradation and micro-carbon adhesion, extending calcination cycle intervals by 40%.
Implementation of real-time sensor array modeling to predict exact gel saturation profiles inside candle filter packs, facilitating automated backwash cycles before shear degradation occurs.
Engineered low-shear candle configurations designed specifically for heat-sensitive bio-polymers like Polylactic Acid (PLA), minimizing thermal degradation during long residence times.
In-depth technical answers addressing common procurement, design, operational, and maintenance inquiries for nonwoven candle filter elements.
Explore our complete product ecosystem, including leaf disc filters, high-purity recycling machinery, and custom granulating filtration systems.
