Managing Bath Alkali Profiles for Low Liquor Ratio Cotton Dyeing
Low liquor ratio cotton dyeing demands progressive alkali profiling to suppress early hydrolysis, match bath exhaustion, and eliminate bulk shade streakiness.
Jet Dyeing Nozzle
Mechanical Element
A specialized venturi orifice inside pressurized fabric dyeing machines accelerates dye liquor to transport tubular knitted or woven fabric ropes. The jet dyeing nozzle regulates fluid velocity and liquor ratio during high-temperature exhaust dyeing. Dyehouse technicians select nozzle diameters based on fabric weight and surface sensitivity to prevent mechanical abrasion.
Hydrodynamic Function
Pumped dye liquor passes through a constricted throat section, creating a low-pressure high-velocity fluid stream that draws the fabric rope forward. Proper nozzle selection ensures even liquor penetration without causing fabric tension, rope marks or surface pilling. Narrower nozzles increase liquor velocity for heavy denim or canvas fabrics, while wider nozzles protect delicate lightweight filament silks and rayon knits.
Hydraulic pressure adjustments match fabric rope speed with reel rotation speed to prevent tangles and machine stop marks. Modern jet dyeing machines utilize interchangeable nozzle inserts to accommodate changing fabric weights across production schedules.
Operating Limit
Excessive liquor pressure inside the throat section induces mechanical fabric surface distortion and fiber breakage. Undersized nozzle diameters cause fabric rope choking, leading to uneven dye distribution and machine stoppage.
Equipment Function
Machine efficiency depends on matching nozzle geometry to fabric weight and construction. Correct fluid velocity settings eliminate liquor channeling inside fabric folds during dye exhaustion cycles. The jet dyeing nozzle controls mechanical transport dynamics in pressurized piece dyeing operations.