The working principle of the air knife is mainly based on the use of high-speed airflow generated by compressed air or other gases to achieve cleaning, blowing, dust removal, peeling and other functions. The core component of the air knife is the nozzle, which controls the direction, speed, and density of the airflow by changing parameters such as gas pressure and flow rate, thereby achieving different working effects. The spraying pressure of the air knife can be controlled by adjusting the pressure of compressed air to meet the cleaning and wiping needs of different objects.

The shape and size of the nozzle also affect the speed and density of the airflow, and different shapes and sizes of nozzles are suitable for cleaning different types of objects. For example, in the application of galvanized wire, the gas knife cuts the target object by generating a gas dynamic effect through high-speed gas injection. When the airflow comes into contact with the target object, a shear impact force  is generated, cutting the target object apart.

Compared with the air knife, although both use compressed air or nitrogen to form high-speed airflow to complete similar tasks such as blowing, cleaning, etc., the airflow of the air knife is more concentrated, easier to control, and more suitable for detail processing. The airflow generated by the air knife is more stable and less noisy. The working principle of the Super Air Knife also involves the Kodak effect, which uses a special geometric shape to quickly blow out compressed air with an extremely thin airflow, forming a high-strength impact wind curtain.

Air knives are widely used in various industrial fields, such as surface liquid removal and drying of machined parts, cleaning and blowing debris at positioning positions in automated production lines, blowing liquid for beverage assembly lines, and surface drying before packaging vegetables and fruits.