Dyeing machine for lightweight fabrics is engineered with medium-to-heavy woven fabrics in mind. When processing lightweight fabrics — typically in the range of 30 g/m² to 300 g/m² — standard machines introduce risks that are commercially and technically unacceptable: creasing, abrasion marks, tension-induced elongation, uneven dye uptake, and surface defects including scratches, slip marks, and point defects.
The root cause is mechanical: a conventional reel-driven system exerts cyclical tension on the fabric rope. For heavier materials, this is manageable. For superfine polyester, lightweight nylon, high-density wovens, or delicate silk-like synthetics, the same tension causes irreversible damage before the dyeing cycle even completes.
The industry's answer has been the development of reelless, nozzle-driven jet dyeing systems — machines where fabric movement is controlled exclusively by pressurized liquor flow through precisely engineered nozzles, dramatically reducing mechanical stress on the fabric rope.
In a rope-form jet dyeing machine, fabric circulates continuously through a closed vessel. The speed of circulation, tube diameter, and nozzle geometry directly determine how much mechanical force acts on the fabric. Lightweight fabrics — especially warp-knit structures, woven crepes, and superfine polyester — are highly susceptible to tension-induced creasing, which can become permanently set during high-temperature processing. Eliminating the driving reel and relying solely on a pressurized nozzle system is the foundational engineering response to this problem.
Liquor ratio (the ratio of water volume to fabric weight in the vessel) is one of the most consequential variables in jet dyeing. A high liquor ratio dilutes dye concentration and increases energy, water, and chemical consumption. A very low liquor ratio can cause unlevel dyeing if the hydraulic flow is insufficient to maintain consistent fabric circulation and dye distribution.
Modern machines like the ultra-low liquor ratio liquid flow dyeing machines from Yadong Machinery operate at significantly reduced water-to-fabric ratios. For the SF Model, the liquor volume ranges from 900 to 6,000 liters depending on configuration, serving fabric loads from 150 kg to 1,200 kg — enabling precise, controllable liquor ratios without sacrificing dye levelness.
Fabric speed inside the dyeing vessel directly impacts dye exhaustion rates, levelness, and fabric integrity. Too slow, and the risk of unlevel dyeing and creasing increases. Too fast, and mechanical forces on delicate fabrics become destructive. The SF model operates across a fabric speed range of 150–600 m/min, adjustable according to the fabric type and processing requirement.
The nozzle system in the SF model incorporates both a main nozzle and a feeding/pouring nozzle that can be operated independently. Large-flow nozzles improve the leveling effect by maintaining consistent, high-velocity liquor flow around and through the fabric rope. This design is critical for achieving uniform dye penetration in high-density, superfine woven fabrics where liquor needs to penetrate tight weave structures.
High-temperature jet dyeing — typically conducted at up to 140°C under pressures of up to 4 kg/cm² — is essential for dyeing synthetic fibers like polyester and nylon, which require elevated temperatures to open the fiber structure and allow dye penetration. However, these conditions must be precisely controlled to prevent thermal damage, barriness, or dye migration.
Optional equipment such as proportional heating and cooling devices and pH control systems (available as factory options on the SF model) allow operators to implement precise temperature ramp profiles and maintain dye bath chemistry within optimal parameters throughout the cycle.
The SF model is available in three standard configurations — SF-1, SF-2, and SF-4 — scaling linearly in capacity while maintaining identical operating parameters. All models are compatible with the full range of optional accessories.
| Parameter | SF-1-250 / 250-P | SF-2-500 / 500-P | SF-4-1000 / 1000-P |
|---|---|---|---|
| Max. Temperature | 140 °C | ||
| Max. Pressure | 4 kg/cm² | ||
| Liquor Volume (L) | 900–1,300 / 1,000–1,500 | 1,800–2,600 / 2,000–3,000 | 3,600–5,200 / 4,000–6,000 |
| Capacity (kg) | 150–250 / 180–300 | 300–500 / 360–600 | 600–1,000 / 720–1,200 |
| Main Pump (HP) | 25 | 40 | 75 |
| Fabric Speed (m/min) | 150–600 | ||
| Machine Length L1 (mm) | 9,430 / 9,450 | ||
| Machine Length L2 (mm) | 11,300 / 11,320 | ||
| Width W (mm) | 1,600 / 1,630 | 2,550 / 2,650 | 5,130 / 5,180 |
| Height H1 (mm) | 1,525 / 1,612 | ||
| Height H2 (mm) | 3,140 / 3,130 | ||
Source: Yadong Machinery — SF Model Product Page. Values shown as Standard / P-type variants.
A major differentiator of the SF model is its extensive optional accessory list, allowing plants to configure the machine to their specific process requirements without overinvesting in unnecessary features:
The available options include water/steam flowmeters for precise liquor measurement; proportional heating and cooling devices for programmable temperature ramp control; proportional dosing devices for automated dye and auxiliary chemical addition; and meter-length measuring devices to track fabric length in real time. Plants requiring higher throughput can specify the double barrel system; those with space or layout constraints can add an out-of-cloth arrangement device. For water efficiency, a high-temperature washing system enables effective rinse stages within the same vessel. A pH control system is also available for processes where dye bath acidity is critical to color consistency — particularly relevant for reactive and acid dye systems used on protein and cellulosic blended lightweight fabrics.
