The rotor spray unit has become a critical technology in modern textile processing, offering a contactless method for applying finishes, dyes, and coatings. Unlike conventional padding (foulard) systems that saturate and squeeze the fabric, rotor spray units use high-speed rotating discs to atomise chemicals into a fine, controlled mist . This allows for precise, uniform application on one or both sides of the substrate without mechanical stress .
A primary application is in sustainable finishing and coating. The system dramatically reduces water and chemical consumption by applying low pick-up (10-40%) liquids directly to the fabric . This "minimal application" technique lowers the energy required for intermediate drying, directly reducing the carbon footprint of stenter frames and continuous ranges .
In continuous dyeing, rotor spray technology enables innovative processes like the PS² (Pad-Spray-Steam) method . By spraying alkali or fixing chemicals onto the fabric wet-on-wet, it eliminates the need for a secondary chemical padder and intermediate drying. This resolves common issues such as dye tailing, hydrolysis, and center-side variation, making short-batch production more economical and repeatable . It is compatible with reactive, vat, sulphur, and pigment dyes for both woven and denim yarns .
Furthermore, the technology excels in producing technical textiles and specialty finishes. It is used to apply durable water repellents (DWR), antimicrobial agents, and flame retardants to fabrics for automotive, medical, and protective clothing sectors . The non-contact nature preserves the fabric's capillary structure and hand feel while ensuring precise, streak-free results .
