These machines can be defined as an improved version of roller dyeing machines or hybrid type of machines with combination of features of roller dyeing and cabinet dyeing.
The features incorporated in these machines are especially important to overcome the problems related to delicate yarns such as silk , viscose and wool yarns.
These machines are made of rectangular shaped box type enclosed main body, in which the spray arms are located ,there is collection tank with heating coils at the bottom.
These machines have removable loading arms ,same as in roller dyeing machines ,but having perforations for spraying the dye liquor from inside the rollers. These arms have an arrangement also fitted with suitable spray pipes for spraying the dye liquor from outside as well inside of the hanks . The arms rotate on their axis with the hanks thus spraying the dye liquor from both inside and outside of the hanks ,covering uniformly the entire hank.. The excess liquor is collected at the bottom tank ,from which it is again fed to the spray system with the help of a centrifugal pump. The spray pressure and flow rate can be adjusted as per the material quality and type of hanks. The RPM and direction of rotation of the arms can be varied according to the yarn quality and process parameters, to get uniform dyeing results and to avoid the yarn entanglements.