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Carding Machine for Polyester Staple Fiber — Web Formation for Wadding, Nonwoven and Fill Production
The carding machine is the critical first processing step for converting polyester staple fiber (PSF) bales into the uniform fiber web (batt) that feeds thermal bonding wadding lines, needlepunch nonwoven lines, and fill fiber opening systems. The quality of the carded web — its weight uniformity, fiber orientation, and freedom from defects — determines the quality of every product downstream. VNPOLYFIBER supplies carding machines matched to our PSF product range, ensuring fiber specification and machine specification are aligned from the start.
What a Carding Machine Does
A carding machine converts loose, tangled fiber (opened from compressed bales) into a thin, uniform fiber web called a batt or sliver, with controlled fiber orientation and consistent weight per unit area (gsm). The carding process:
- Fiber feeding: Opened fiber is fed to the carding machine’s feed rollers by a fiber storage hopper and auto-leveler — which measures incoming fiber density and adjusts feed rate to maintain consistent web weight.
- Opening and separation: The fiber mass passes between the main cylinder (large toothed roller, typically 1,200–1,500 mm diameter, rotating at high speed) and a series of flat bars or worker/stripper roller pairs, each opening the fiber clumps further until individual fibers are separated and parallelized.
- Web formation: On the doffer roller, the individualized fibers are condensed into a thin, coherent web that is stripped and delivered as a continuous batt to the downstream process. A double-doffer machine delivers two webs that are combined for higher output or two-layer constructions.
- Auto-leveling: High-precision carding machines include an auto-leveler at the feed — a sensor measuring incoming fiber thickness that adjusts feed roller speed to compensate for density variations in the bale, producing a more uniform output web.
Carding Machine Types and Configurations
| Type | Output Width | Best For |
| Single-doffer, flat-top | 1,000–2,500 mm | Standard nonwoven web formation. Good fiber parallelization. Cost-effective for single-layer web applications. |
| Double-doffer | 1,000–2,500 mm | Higher output. Two-web delivery allows higher production speed without sacrificing web uniformity. Standard for wadding production lines. |
| Random-roll carding machine | 1,000–2,500 mm | Produces randomly oriented fiber web (more isotropic) vs parallelized web. Better for needlepunch nonwoven where equal MD and CD strength is needed. |
| High-speed production carding | 1,500–3,200 mm | Large-scale commercial production — 800–2,000 kg/hour output depending on fiber type and web weight. Integrated auto-leveling and web weight monitoring. |
Technical Specifications
| Parameter | Standard Specification Range |
| Working width | 1,000 mm – 3,200 mm (specify to match downstream cross-lapper and bonding line width) |
| Production capacity | 200 – 2,000 kg/hour depending on width, fiber type, and web weight |
| Main cylinder diameter | 1,200 – 1,500 mm (larger diameter = higher peripheral speed = better opening) |
| Main cylinder speed | 200 – 600 RPM (peripheral speed 750–3,500 m/min for standard PSF) |
| Web weight range | 20 – 200 g/m² from single carding pass; higher with cross-lapper |
| Auto-leveler | Capacitive or microwave sensor; ±2% web weight uniformity with auto-leveling |
| Drive system | Variable frequency drive (VFD) on main components for speed adjustment |
| Power consumption | 15 – 75 kW depending on width and speed |
| Fiber compatibility | Polyester staple fiber 1.5D–17D, staple length 32–76 mm (specify to match your PSF grade) |
PSF Specification for Optimal Carding Performance
Carding performance — web uniformity, production speed, fiber damage rate — is directly determined by PSF specification. The wrong fiber specification causes poor web quality, frequent machine stoppages, and higher maintenance cost:
| PSF Parameter | Carding Specification and Why It Matters |
| Fiber type for nonwoven | Solid PSF — round or multi-lobal. Not HCS fill fiber (hollow fiber is too fragile for the mechanical forces in carding for nonwoven; conjugate crimp can cause tangling in high-speed carding). Solid fiber withstands the high-velocity wire contact without crushing. |
| Fiber type for wadding | HCS or solid PSF can be carded for thermal bonding wadding. HCS requires slightly lower carding speeds to avoid crush damage to the hollow cross-section. Blended with LMF bico at 15–25% for thermal bonding. |
| Denier range | 4D–12D for standard nonwoven web formation. Finer fiber (1.5D–4D) produces finer, more uniform webs for hygiene and filtration. Coarser fiber (10D–17D) for heavy needlepunch geotextile. |
| Staple length | 38–64mm for standard carding systems. 32–38mm for short-staple carding systems (cotton-system machines). 51–76mm for heavy nonwoven carding. Staple length must match machine’s draft zone setting. |
| Crimp frequency | 8–14 crimps/25mm for standard carding. Crimp provides fiber cohesion in the web. Under-crimped fiber produces fragile, easily-broken web; over-crimped fiber clumps in the card. |
| Finish | Non-siliconized spin finish for nonwoven PSF — silicone reduces inter-fiber cohesion needed for web integrity and prevents adhesion of acrylic binder in chemical bonding applications. |
| Moisture content | Below 0.5% — excess moisture causes fiber sticking to wire clothing and reduces production speed. |
Where Carding Fits in Complete Production Lines
- Thermal bonding wadding line: Bale opener → carding machine → cross-lapper → through-air bonding oven → winder. The carding machine produces the fiber web; the cross-lapper builds it to target gsm; the oven bonds it.
- Needlepunch nonwoven line: Bale opener → carding machine → cross-lapper → pre-needle loom → main needle looms → winder. The carding machine is the web formation step that determines base web quality for the entire needlepunch process.
- Airlaid nonwoven line: Short-cut fiber → airlaid web former (not a conventional carding machine — airlaid uses air distribution). VNPOLYFIBER can advise on airlaid-compatible fiber specifications separately.
Supply Carding Machine and PSF Together from VNPOLYFIBER
VNPOLYFIBER supplies carding machines (single-doffer, double-doffer, and random-roll configurations in working widths from 1,000–3,200 mm) alongside matched solid PSF for nonwoven production. Combined supply provides:
- Fiber-machine specification alignment: We confirm PSF denier, staple length, and crimp specification against your specific carding machine model before fiber supply begins.
- Production trial support: Recommended main cylinder speed, flat-top setting, and doffer speed for your fiber specification — reducing machine setup time.
- Complete line packages: Carding machine + cross-lapper + bonding oven combinations available for complete thermal bonding wadding line setups.
Contact VNPOLYFIBER with your web weight target, production width requirement, target output gsm, and downstream bonding method for a matched carding machine and PSF quotation.