Top making method and general process flow

Top making is divided into two ways: loose fiber comb and long tow of chemical fiber.
(1) in the process of making loose fiber, the raw materials are different, and the processing system, process flow and equipment are different. They are usually divided into two categories: the French processing system and the British processing system. The French processing system is mainly suitable for processing fine and short raw materials. When combing the fiber, the amount of oiling is generally less. After the top is processed, the oil content is controlled at 1.2%~1.5%, so there is the name of dry top. British processing system is mainly suitable for processing long and thick material, in this process, in order to protect the fiber damage to add more oil and gas, except in the hair, before the top sent combed plus an oil, the oil refined top general in 3%~4%, it is oil tops called. The British system has been phased out and rarely used.
The general process of French top making and processing system is as follows:
Wool or chemical fiber, wool, worsted carding, gas 2~3, cross needle comb combing, a needle tube, comb (washing, end) needle comb, combed wool
In the process of mixing strips with pure chemical fiber or high proportion of chemical fiber, 2 crossed needles can be used before combing, and the washing process is generally not carried out. When the wool or semi fine wool is processed, it can not be washed again. In order to reduce the combing drop rate, the process of combing before washing can also be used to process larger fine wool.
(2) the direct strip making of chemical fiber is a way to keep the fiber arrangement in the long filament of the chemical fiber smooth. The method of cutting, breaking or combining the two parts makes the long fiber in the bundle become the staple fiber for spinning. Obviously, this is a more economical way to make strips of chemical fiber.