The total 150D DTY YARN point of 900 cylinders can be selected in the range of 29,000-36,000. 2.12 Adjusting the combing gap of combing cylinders. Properly reducing the combing gap of domestic cylinders can strengthen the rapid insertion, puncture, opening and finishing functions of the serrated teeth in the front zone, creating a comprehensive and refined carding in the rear zone. The powerful conditions are conducive to the improvement of the degree of single fiber,which is directly reflected in the substantial improvement in the quality of the yarn. However, the carding gap can not be too small, otherwise it will cause damage to the effective fiber. Table 1 is the adjustment standard of combing cylinder carding gauge. Table 3 Commonly used combing cylinder carding gauge adjustment standard. 2.13 Recent yarn quality indicators Through the implementation of a series of technical measures, the yarn quality has been greatly improvedTherefore, its iso-intensity lines are all semicircles with the center of the gathering groove. Rieter agglomeration spinning uses an 'airflow hood' to 'isolate' the effective rotating airflow from the workshop atmosphere, so that the rotating airflow is confined to the narrow space of the gathering area, which can significantly reduce energy consumption.8.Cotton Textile Technology. Therefore, the airflow is also concentrated in the gathering groove, the airflow at the slot is the strongest, and gradually weakens outward to zero, which is the 'airflow field of the gathering groove'. Its deflector also has a quality supervision function. Among them, the small white dot (dynamic) representing the air flow direction comes from the deflector arm of the pressure roller shaft. (5) The Rieter suction drum-type air-flow concentrating and spinning device does not have 'large wind resistance' elements (such as grid rings) in the entire air flow path, so the air pressure can be effectively reduced while ensuring the flow rate.