Draft multiple When feeding roving fineness is constant, the draft multiple changes within a certain range and affects the unevenness of the yarn sliver dryness. The main carding parts of the carding machine should be properly maintained to ensure good performance. Mechanical status, so as to achieve accurate process on the car. In addition, the speed ratio of the licker-roll and the cylinder, the cylinder and the doffer should be carefully selected. Generally, the factory selects a good speed ratio according to the specific conditions after testing.
First, improve the clarity of the cotton net and reduce the growth of neps in the subsequent process. The straightness and parallelism of the fibers in the cotton web, and the kink and uniform distribution of the single fiber are expressed by the clarity of the cotton web. The poorer clarity of the cotton net means that the fiber separation and straightening parallelism in the sliver are poor. There are many intersecting and tangled fibers, which has a great impact on the number of cotton knots. A large number of loose fibers intersect and kinks. Although no neps are formed in the sliver, due to the drafting force during the drafting process, these loose kinks are tightened to form new neps. Therefore, we must pay attention to the quality index of cotton net clarity.
Strictly control the sliver lint rate and reduce the planktonic fiber rate. The length of the fibers that make up the neps
60% to 70% are short fluff under 16mm. This is because the fluff itself is not easy to control during the spinning process, but it spreads to form hairiness, and then forms neps after friction.
Carding-Ding Xu is the main process for producing short fluff. In order to reduce sliver lint, attention should be paid to reducing fiber damage and breakage, and strengthening the removal of lint.
Strengthen the temperature and humidity management to reduce impurities. The environment in which the cleaning and carding processes are located must have a relatively low temperature, so that the fibers are continuously dehumidified. This will control the moisture regain of the semi-products during the carding process. This can also reduce the cohesion between fibers and maintain good elasticity and rigidity, which is conducive to opening, removing impurities, carding and transfer, thereby reducing adhesion and kinks, and reducing the number of neps particles.
Second, improve the parallel straightness of the fiber and strengthen the control of the planktonic fiber. The higher the parallel straightness of the fibers, the less chance of neps formation, especially in the process of roller drawing, the reduction of neps formation is particularly obvious.
Spinning frame
The spinning frame spinning machine is a spinning machine with periodic motion. Spindle spinning machine can be divided into two categories according to the different types of movement: one is the traditional carriage type spindle machine, the main feature is the movement of the spindle car, the roving frame is fixed, so the block r_I = must follow the spindle car ; Another type is the carriage type spindle machine, the spindle frame is fixed during spinning, and the roving frame moves back and forth. The quality of the spun yarn produced by the spinning frame is high, especially when processing some special fibers (such as spinning fine and special single cashmere rabbits)
Velvet wool and its blended yarn, etc.), has its unique effect.
Take the walking machine of the spindle car as an example to introduce the composition and process of the spindle machine. Composition of the spindle car The mobile spinning frame consists of a mobile spindle car and a fixed roving frame. The roving frame part includes roving rolls, roving frames, withdrawal cylinders, and feed rollers. The spindle car part includes spindles, spindle drums, spindle ropes, wheels, rails, yarn guides and tension rods.
The roving roll 1 is returned from the take-up drum 2 to the wholesale shirt, which is sent out by the feed rollers 3, 4, 5 and then wound on the bobbin that rotates with the spindle 8 by the action of the tension rod 6 and the yarn guide rod 7. The spindle 8 is driven by a belt or by a spindle drum 9 through a spindle rope 10. Both the spindle and the drum are installed in the car frame, and the car frame is installed on the wheel. The wheel carries the ingot car and moves inward and outward on the formed rail. N ~ bg (that is, moving to the right) is referred to as "vehicle movement", and inward movement (that is, to the left) is called "car entering motion". The function of the yarn guide is to make the sliver at a certain position. The tension rod assists the yarn guide rod to maintain a certain tension during the winding of the yarn.
On the spindle machine, the spindle tip and the feeding roller are two jaws that hold the sliver. The relative speed and distance of the two holding parts when leaving the car are greater than the speed and length of the feeding bar. The sliver was drafted. In addition, the yarn loop is removed from the spindle tip once every revolution of the spindle, thus adding a twist to the sliver. When the sliver slips off, there will be a certain oscillation, which can make the twist forward. After the sliver is drafted and twisted, the spun yarn is wound into a bobbin due to the combination of the feed speed and the spindle rotation speed, plus the role of the yarn guide rod and the tension rod, thereby completing the winding effect
