Shortwave Infrared Band Selection for Cotton Contaminant Removal
Targeting 1450 nm and 2200 nm shortwave infrared bands differentiates polypropylene and organic contaminants from cotton lint with high optical contrast.
Pneumatic Valve Ejection
Air Discharging
Automated sorting machines use high-speed air blasts to remove contaminants from a continuous stream of raw fibre. Systems utilizing pneumatic valve ejection redirect unwanted particles into a collection chute by releasing a localized burst of pressurized air.
Solenoid Response
Precision electronic valves control the release of the compressed air blasts with millisecond accuracy. When the detection sensor identifies a piece of foreign matter, it triggers a solenoid that executes the pneumatic valve ejection. The valve must open and close within three milliseconds to isolate the contaminant without removing excessive amounts of good fibre, ensuring that yield remains as high as possible.
Removal Accuracy
Misalignment or lag in the pneumatic system reduces sorting efficiency and increases the amount of clean fiber that is discarded. Regular maintenance of the pneumatic valve ejection system prevents clogging of the nozzle orifices, which would otherwise alter the direction of the air blast. Proper nozzle alignment ensures that the air stream hits the targeted contaminant directly.
Compressed Consumption
Operating a sorting machine requires a continuous supply of clean and dry compressed air. The energy required for pneumatic valve ejection depends on the frequency of the valve operations and the pressure of the air supply. In mills processing highly contaminated raw materials, high air consumption increases the operational cost of the cleaning line.