Abstract: Starting from the weft－insertion system of air－jet loom, the leakage of compressed air in the supplying and applying process was tested. Test results show that leakage is mainly caused by wear and damaged parts and components which are not timely repaired or replaced and the amount of leakage and energy consumption increase along with the increase of pressure drop. By optimization, the leakage can be reduced or even eliminated, thus making the air－jet loom able to meet energy－saving requirements.

Key words: compressed air; leakage evaluation; weft－insertion system; leakage test; linear relationship