Process Explanation In Spinning Process

It is a key process in spinning process, and the adjustment of carding process is particularly important.

According to the characteristics of colored cotton, such as high impurity content and short pile, the utility model adopts a low knife and small angle (-2mm, 75 degrees) to increase impurity removal and prevent short pile recycling.

The speed of the roller is adjusted from the original 880r/min to 820r/min, and the speed of the needle roller is reduced appropriately. This will help to reduce the hitting force on the cotton layer, reduce the neps and improve the yarn quality.

But the speed of the needle roller should not be too low, the speed is too low, the comb effect and the impurity removal effect are poor, and the impurities in the sliver increase obviously.

The cylinder speed is kept unchanged (360r/min), and the speed of the cover plate is increased. The speed of the cover plate is adjusted from original 200mm/min to 250mm/min, which increases the amount of flower cover and reduces the NEP impurity of the sliver.

The speed of the cover is raised, the speed of the machine parts is accelerated, and the machine parts are easily damaged.

Other carding process parameters are adjusted as follows: thorn roller to cylinder gap 0.18mm, tin Lin to cover plate spacer are 0.17, 0.15, 0.15, 0.15, 0.17mm, doffer speed 22r/min.

After the above process adjustment, the quality of the sliver has obviously improved.

The neps and impurities of sliver sliver are 22 and 32 /g respectively, and the CV value of Wulff bar is 5.6%.

The premixed mixing method ensures both full mixing and accurate control of blending ratio.

In order to ensure that the yarn can achieve the exact 30/70 blending ratio, the proportion of colored cotton should be high in pre mixed mixing, and the best is 31/69.

Because the color cotton short pile is more, after the combing, most of the short pile is removed, and this white cotton short pile is relatively small, so after the combing, the proportion of colored cotton is reduced accordingly.

After accurate blending ratio, the pre blending process should also be properly adjusted.

The white cotton pre blending process was originally made as follows: roller spacing 5mm * 10mm, pressure bar adjusting ring diameter of 14mm, speed of 220m/min; adjusted process is: roller spacing 4.5mm x 9mm, pressure bar adjustment ring diameter is 13mm, speed is 190m/min.

The main task of combing process is to remove most of the short fiber and impurities in the fiber and improve the stripper level.

Because colored cotton contains a lot of short cashmere, the task of combing is particularly important.

The speed of the combing process should be reduced, the noil percentage should be increased, and the drafting distance should be adjusted.

The speed was reduced from 160 /min to 140 clamp /min, and the noil distance increased from original 11mm to 14mm, and the dropout rate increased from 15% to 21%, and the drafting distance was 7mm.

After adjusting the process, the quality level of the combed strip has been significantly improved, the combing stem CV value is 4.82%, the NEP is 18 /g, the impurity is 14 /g, and the 16mm short pile is 13%.

Drawing process.

The drawing way of the FA326 drawing frame adopts three upper three directions plus the upper roller pressure bar curve drafting, the draft is reasonable, and the better evenness can be obtained; and the short segment self levelling device can regulate the periodic irregularity of the cotton sliver, stabilize the evenness, and adapt to the high speed. Using a drawing strip can shorten the technological process and save money, and the level can also meet the requirements.

Configuration process.

After adjustment, the CV value of the strips was reduced from 4.34% to 3.48%, and the quality was greatly improved.

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The JWFl415 roving frame is four rollers double short apron draft, and the first and second rollers are asked to be the cluster tension drafting area, the second, third rollers are the main drafting areas, and the third, fourth rollers are the post drafting areas.

In order to exert the drafting effect of the main drafting area and improve the evenness and inner structure of the roving yarn, we reduced the roller spacing of the main drafting area and adopted the main principle of the main drafting area.

Two schemes are adopted for process test.

Scheme 1 is much better than roving yarn in plan 2, which is due to shorter fiber length and smaller roller spacing, which is conducive to controlling the floating fibers in the draft area. At the same time, the drafting ratio of the draft area should be reduced and the role of the main draft zone should be brought into play, so as to improve the CV value of roving yarn.