Needle-punching Filter Fabric Production Line
Production Process Flow
Fiber packaging → Unpacking machine → Multi-bin blending machine → Coarse loosening → Fine loosening → Air pressure cotton box → Double-lap double-fork combing machine → Cross laying machine → Pre-needling → Multiple main needling machines (densely needled) → Heat setting machine → (Optional: Brushing machine, calendering machine) → Online weight/air permeability testing → Edge cutting → Storage → Rolling up
Subsequent offline processes: PTFE impregnation, coating, water-repellent and oil-resistant treatment, and cutting and sewing of filter bags.
Equipment Configuration
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Opening and Mixing Unit
Bag opening, multi-bin mixing, coarse/fine carding; High-temperature fibers (PPS/aramid) have few impurities, high precision requirements for fiber blending, strict formula ratio; Fiberglass version requires dust-proof protection.
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Feeding and Combing Unit
Pressure cotton box quantification; Double-lap double-filament combing machine, higher uniformity of fiber web than ordinary home textile needle-punching, directly affecting the deviation of air permeability.
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Cross-laying Machine
Multi-layer stacking of nets, ensuring that the longitudinal and transverse strength are close, and the filter bag is evenly stressed.
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Needle-punching Unit (Core)
Pre-punching + 2 to 4 main needle-punching machines (multiple progressive encryption); The filter material cannot be punched suddenly, otherwise the pores will be blocked and the air permeability will deteriorate; Select filter-specific fine needle; High-end equipped with Fehrer/Dilo needle-punching machine head.
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Key Configurations in Later Stage
Heat setting oven: Eliminate internal stress, stabilize size, prevent filter bag from shrinking and deforming at high temperature;
Optional carding + polishing: Surface is flat, reduces dust embedding, easy for cleaning.
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Online Inspection & Control
Online monitoring of surface density and air permeability (ordinary needle-punching lines generally do not have online air permeability inspection); Cutting edge, storage, automatic winding, PLC full-line linkage; Dust removal system, explosion-proof in high-temperature fiber workshop.
Technical Specifications
| Parameter |
Specification |
| Raw Materials |
Room temperature PET polyester staple fibers; Medium-temperature acrylic; High-temperature PPS, aramid, P84, PTFE, fiberglass; Fiber length 38–51mm |
| Finished Product Weight |
450–800 g/㎡ (mainstream filter bags are 500, 550, 600 gsm) |
| Working Width |
2.0m / 2.4m |
| Production Speed |
1.5–6 m/min |
| Production Capacity |
180–400 kg/h |
| Product Characteristics |
Three-dimensional pore structure, stable air permeability, high breaking strength, small thermal shrinkage of size; Can be made into water-repellent and oil-resistant, anti-static, and coated filter materials. |
Applications
Industrial Dust Removal
Cement plants, steel mills, waste incineration, power plants, chemical pulse dust collectors filter bags
Liquid-Solid Filtration
Chemical liquid filtration, wastewater filter felts
Air Purification
Large-scale ventilation dust removal, powder recovery