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| Engineered for industrial filter bag production, this cylindrical double-needle machine features synchronous needle, feed dog and presser foot feeding to eliminate fabric deviation. It delivers a max sewing speed of 2600rpm, handles filter bags as small as 80mm in diameter, and comes with an electronic positioning motor for automatic needle positioning and speed adjustment. | |||||||||
High-temperature meta-aramid filter bags, also known as Nomex filter bags (a registered trademark of DuPont for meta-aramid fibers), address the performance limitations of polyester, acrylic, and standard PPS filters in extreme heat environments. Constructed from aramid 1313 fibers certified by ISO 13934-1 for textile strength, these filtration solutions combine thermal stability, flame resistance, and dust capture capabilities for industrial operations with sustained high temperatures.
The SY-4331 two-needle short arm sewing machine produces these filter bags with precise seam construction. This cylindrical double-needle machine features synchronous feeding of the needle, feed dog, and presser foot, preventing fabric deviation during production.
Parameter | Value |
Max sewing speed | 2600 rpm/min |
Max stitch length | 8 mm |
Min filter bag diameter | 80 mm |
Presser foot lift height | 18 mm |
Needle quantity | 2 |
Needle gauge | 6.4/12.7 mm (optional) |
Needle type | UY128 (No.19-23) |
Lubrication | Local oiling by hand |
Dimensions (L×W×H) | 1050×550×1100 mm |
Motor power | 380V 550W (Electronic positioning motor: 220V 750W with automatic needle positioning, automatic presser foot lifting, and infinite speed adjustment) |
Max sewing speed | Max stitch length | Min filter bag diameter | Presser foot lift height | Needle quantity | Needle gauge | Needle type | Lubrication | Size(L*W*H) |
2600rpm/min | 8mm | 80mm | 18mm | 2 | 6.4/12.7mm(optional) | UY128(No.19-23) | Local oiling by hand | 1050*550*1100mm |
Motor power | 380V 550W (Electronic positioning motor,220V 750W,with the function of automatic needle positioning function, automatic lifting presser foot function,infinite speed adjustment function) | |||||||
These filter bags maintain structural integrity at continuous operating temperatures up to 190.56°C (375°F), with short-term surge tolerance up to 218.33°C (425°F) tested per ASTM D5432 standards. Their molecular structure of aromatic rings linked by amide bonds provides inherent flame resistance meeting UL 94 V-0 and NFPA 2112 standards, with no additional chemical treatments required.
Tensile strength measures 1700N/5cm in the warp direction and 1500N/5cm in the weft direction (tested via ASTM D5034), resisting tearing during installation, pulse-jet cleaning cycles up to 6 bar pressure, and high-velocity dust impacts up to 15 m/s.
The filter bags achieve an M14 filtration rating per EN ISO 16890, capturing 99.9% of particles as small as 10 microns. After 2000+ hours in air at 200°C (per ISO 4892-3 accelerated aging tests), they maintain ≥85% of their original tensile strength. They operate effectively in environments with 30-70% relative humidity, with no hydrolysis observed after 12 months of continuous use in humid metal smelting facilities.
These filtration solutions serve multiple sectors with high-temperature operations:
Metal smelting: Captures metal oxide fumes from electric arc furnaces and basic oxygen furnaces, withstanding molten particle contact up to 218°C
Glass manufacturing: Filters silica dust (SiO₂ content >90%) from furnace exhaust systems operating at 180-190°C, complying with OSHA 29 CFR 1926.1153
Incineration plants: Handles ash particles with heavy metal content from medical and hazardous waste incinerators
Automotive coating: Manages paint overspray particles in high-temperature curing ovens operating at 160-180°C
Compared to glass fiber, PTFE, and PPS filters, meta-aramid filter bags offer distinct benefits:
Cost: 40% more affordable than PTFE filters while providing higher thermal performance than polyester
Thermal shock resistance: Withstands 500+ thermal cycles between 20°C and 190°C without structural failure
Energy efficiency: Initial pressure drop of 0.4 bar reduces fan energy consumption by 15-20%
Handling: Bend radius of 50mm simplifies installation and reduces breakage during maintenance
Tailored manufacturing ensures optimal performance for specific applications. Engineers conduct thermal profile analysis to recommend appropriate material thickness (600-1000g/m²). Custom dimensions include diameters 120-300mm and lengths 1000-6000mm, with optional PTFE coating (20-30μm thickness) for enhanced chemical resistance.
Each batch undergoes pressure testing at 3.0 bar (1.5× typical operating pressure) and 50 thermal cycles between 20°C and 190°C to ensure seam integrity. Only batches with 100% pass rate are shipped.
Service life varies by application, but generally ranges from 12-24 months in continuous high-temperature operations. Proper maintenance and regular cleaning can extend this period.
Standard meta-aramid filter bags have moderate acid resistance. For applications with high acid concentrations, optional PTFE coating is recommended to extend service life by approximately 30%.
Standard lead time is 2-3 weeks for production, plus shipping time. Prototype testing adds approximately 2 weeks to the timeline for new application developments.
