Production method of combed polyester cotton yarn

[0012] 1. preparing combed polyester-cotton yarn with linear density of 18.5tex and JC/T blending ratio of 60/40:

[0013] 1. raw material preparation:

[0014] The principle of cotton fiber allocation: picking cotton by hand, with maturity above 0.85, short fiber rate within 13%, foreign fiber content within 0.3g/t and neps within 180/g..

[0015] The principle of polyester fiber allocation: choose large chemical fiber polyester, the defect content should be controlled within 1mg/100g, the coefficient of variation of fiber breaking strength should be within 20%, and the dyeing performance of fiber is consistent.

[0016] 2. Opening and cleaning cotton:

[0017] The selected cotton fibers are sequentially grabbed by the FA002 disc picker according to the mixing ratio, and the initial opening and mixing of the cotton fibers are realized in the grabbing process. The grabbed cotton fibers are opened by the A035 cotton opener, and the main mixing effect and auxiliary impurity removal effect are realized in the opening process. The A036 porcupine opener further opens the cotton fibers. In the opening process, the main impurity removal function and auxiliary mixing function are realized. The non-cotton fibers in the fiber flow are identified by YQ600H foreign fiber cleaner, and the identified non-cotton fibers are separated and removed. The cotton fibers are vibrated and opened by SF161A vibrating cotton feeder, and the cotton fiber layer is uniformly conveyed in the vibrating process. The cotton fiber layer uniformly conveyed is rolled by A076F single-hand winder, so that the cotton roll is made.

[0018] The selected polyester fibers are sequentially grabbed by the FA002 disc cotton picker according to the mixing ratio, and the initial opening and mixing of the polyester fibers are realized during the grabbing process. The grabbed polyester fibers are opened by the A035 cotton opener, and the main mixing function and auxiliary impurity removal function are realized during the opening process. The FA106E carding machine further opens the polyester fibers. In the opening process, the main impurity removal function and auxiliary mixing function are realized. The SFA161A vibrating cotton feeder vibrates and opens the polyester fiber, and the uniform conveying of the polyester fiber layer is realized in the vibrating process. The uniformly conveyed polyester fiber layer is uniformly rolled by A076E single-hand winder, so that the polyester roll is made.

[0019] In the process of disc-type cotton grabbing, according to the principle of fine cotton grabbing, ensure that the cotton grabbing amount of each tooth of the cotton grabbing beater blade of the disc-type cotton grabbing machine is small; In the process of single-roll, the mechanical parts between the beater and the dust stick are used to open and remove impurities.

[0020] 3. carding:

[0021] Cotton slivers are made by carefully opening, carding, impurity removal and sliver formation of cotton rolls on FA201B carding machine.

[0022] AC2030*01550D cylinder card clothing, AD4030*01890 doffer card clothing and MCH52 flat card clothing are selected for cotton carding.

[0023] Polyester sliver is made by carefully opening, carding, impurity removal and sliver of polyester coil on FA201B carding machine.

[0024] AC2520*01660P cylinder card clothing, AD4030*02090 doffer card clothing and MCZ30 flat card clothing are selected for polyester carding.

[0025] 4. Cotton combing:

[0026]The sliver is directly made into combed cotton rolls by pre-merging and rolling machine, and then combed to make combed sliver. The pre-merging combined machine comprises a pre-merging part, a rolling part and a merging part, wherein the pre-merging part comprises a first pre-merging part, a second pre-merging part and a third pre-merging part which are longitudinally arranged in parallel; the structures of the first pre-merging part, the second pre-merging part and the third pre-merging part are completely the same; and the first pre-merging part, the second pre-merging part and the third pre-merging part comprise a front reel group platform and a rear reel group platform. The front barrel group and the rear barrel group are respectively arranged on the front barrel group platform and the rear barrel group platform, and the number of barrels contained in the front barrel group and the rear barrel group is the same, and the front barrel group and the rear barrel group include the first row of barrel groups, the second row of barrel groups and the third row of barrel groups arranged transversely from inside to outside, and the barrels in the first row of barrel groups, the second row of barrel groups and the third row of barrel groups. The number of the first, second and third row of barrel groups is the same, all of which are 16-24. The cotton sliver prepared in the third step is wound in the barrel group, and the barrel groups in the front barrel group and the corresponding barrel groups in the back barrel group are arranged in parallel in the longitudinal direction. The upper part of each barrel in the first row of the front barrel group is respectively provided with a guide roller, and the upper part of each barrel in the first row of the rear barrel group is respectively provided with a guide roller, the number of which is the same as that of the first row of barrels, and a sliver drafting roller group is arranged between each guide roller of the front barrel group and a corresponding guide roller of the rear barrel group which is longitudinally arranged in parallel, and the sliver drafting roller group comprises 3 And the rollers in the sliver drafting roller group are arranged in parallel up and down, the total drafting multiple of the sliver drafting roller group is 5.95-6.5, the uppermost roller is kept level with the guide roller, and an upper collecting plate is arranged right below each sliver drafting roller group, and the upper collecting plate comprises a bottom plate, the upper and lower sides of which are straight, and the left and right sides of the bottom plate are both inwardly convex arcs, which are on the left and right sides of the bottom plate. So as to form a slideway with gradually decreasing diameter from top to bottom on the bottom plate, and the rolling part comprises a first rolling part, a second rolling part and a third rolling part, wherein the first rolling part, the second rolling part and the third rolling part have the same structure and are vertically arranged in parallel, and the first rolling part, the second rolling part and the third rolling part comprise a lower collecting plate, The lower collecting plates of the first rolling part, the second rolling part and the third rolling part are respectively arranged at the lower part in the middle of the upper collecting plates of the first pre-merging part, the second pre-merging part and the third pre-merging part. The structure of the lower collecting plate is the same as that of the upper collecting plate, and the area of the lower collecting plate is larger than that of the upper collecting plate. The lower part of the collecting plate is provided with a cotton roll drafting roller group, which comprises 2-3 rows of rollers. The total drafting multiple of the cotton roll drafting roller group is set between 1.5 and 2.5, and the rolling part includes a first guide roller, a second guide roller and a third guide roller, which are respectively arranged at the lower parts of the cotton roll drafting roller groups of the first, second and third rolling parts, and a cotton roll pressing roller is arranged at the right lower part of the second guide roller. The cotton roller group comprises a first cotton roller and a second cotton roller, cotton drums are arranged on the first cotton roller and the second cotton roller, and the motor drives the cotton roller group to rotate and then drives the cotton drum to rotate; When in use, the bobbins wound with the cotton slivers made in the third step are respectively arranged on the first pre-merging part, the second pre-merging part and the third pre-merging part, including the front bobbin group platform and the rear bobbin group platform, and the cotton slivers in the first row of bobbins, the second row of bobbins and the third row of bobbins arranged in parallel along the longitudinal direction of the front bobbin group platform are wound out from the bobbins and then guided together. A sliver in the first, second, and third row of barrels arranged in parallel along the longitudinal direction of the rear barrel group platform is wound out of the barrel and then pressed and output by the guide roller. After being pressed and output, three slivers on the front barrel group platform and three slivers on the rear barrel group platform arranged in parallel along the longitudinal direction jointly enter the sliver drafting roller group for drafting. Under the action of drafting force, So as to reduce the linear density of sliver, at the same time, the fiber in sliver can be straightened in the thinning process, so as to improve the fiber straightness of sliver; the drawn sliver then enters the slideway of the upper collecting plate to realize re-merging; in the merging process, the evenness of sliver can be improved by random combination of coarse details, so as to obtain cotton pre-drawn sliver, The cotton pre-drawn strips output by the first pre-drawing part, the second pre-drawing part and the third pre-drawing part then enter the slideways of the lower collecting plates of the first, second and third rolling parts respectively, so as to realize the convergence of all cotton pre-drawn strips, and the converged cotton pre-drawn strips are drawn by the cotton roll drawing roller group and then output into a cotton net. The cotton webs output by the first rolling part, the second rolling part and the third rolling part are respectively guided by the first guide roller, the second guide roller and the third guide roller, and then pressed by the cotton rolling roller to obtain cotton rolls, and the motor drives the cotton roll roller group to rotate and then drives the cotton drum to rotate, so that the cotton rolls are continuously wound on the cotton drum; Comb the produced cotton roll to make combed sliver, and select E80 comber. During combing, the roller base spacing is 1mm and 8mm respectively, the corresponding roller holding distance is 43mm and 53mm respectively, and the distance between the top comb and the second separating roller is 3.5mm If the top comb is worn, it is necessary to adjust the position of lowering the top comb. Considering the equipment performance, the heavy basis weight is 75g. Comber uses brush to brush short fibers embedded between the needles of cylinder into lint. The quality of brush has a great relationship with the inlaying between the needles of cylinder. The speed of brush is about 3 times faster than that of cylinder, so as to clean cylinder. The speed of brush is set at 1200 rpm. The combing process adopts the process design principle of "heavy preparation, less twisting, timing positioning, balanced doffing, narrowing eye difference, heavy pressurization, quasi-occlusion, two edges and one standard". In order to improve the internal quality of sliver, the doffing rate of combing machine is above 18%, and the doffing and short fiber rate is above 60%. Adopt high-tooth-density cylinder and top comb to do a good job of cleaning, avoid hanging flowers, ensure the stability of carding, and effectively straighten parallel hook fibers; Adopt integral cylinder, select fine needle, adopt short teeth and small working angle for cylinder card clothing, reasonably adjust noil gauge, appropriately increase noil, and control the short fiber rate of combed sliver below 7%; The key point in combing is to control the state of cotton web, avoid the occurrence of hook fibers, broken edges and holes, and further straighten parallel fibers; Keep the temperature at 28℃ and the relative humidity at 52% ~ 60%.

[0027] 5. Polyester pre-drawing:

[0028] Polyester pre-drawn sliver is prepared by pre-drawing, thinning and re-merging. FA316F high-speed drawing frame was selected. During the pre-drawing process, six polyester strips made in the third step were fed together, and the fed six polyester strips were thinned by the drafting action of the drafting system, so that the linear density of the polyester strips was reduced, and the straightness of the polyester fibers in the polyester strips was improved. The drafted polyester strips were re-combined to obtain polyester pre-drawn strips, and the evenness of the polyester strips was improved by random combination of coarse details during the drawing process.

[0029] 6. Mixing and drawing:

[0030] Combed cotton sliver and polyester pre-drawn sliver are drawn together for three times to produce polyester-cotton carded sliver.

[0031] The first drawing frame is FA306A drawing frame, in which a total of eight combed sliver and polyester pre-drawn sliver are fed together, and the number of combed sliver and polyester pre-drawn sliver is determined by the blending ratio of polyester fiber and cotton fiber in the final blended yarn. After the eight combed sliver and polyester pre-drawn sliver are fed together, the polyester-cotton blended sliver is drawn, thinned and re-drawn.

[0032] In the second drawing frame, FA306A drawing frame is used. In the second drawing frame, six polyester-cotton mixed strips are fed together. After the six polyester-cotton mixed strips are fed together, the polyester-cotton semi-cooked strips are drawn, thinned and recombined.

[0033] In the third drawing frame, FA306A drawing frame is used. In the third drawing frame, six polyester-cotton semi-mature strips are fed together. After the six polyester-cotton semi-mature strips are fed together, they are drawn, thinned and re-combined to produce polyester-cotton mature strips.

[0034] 7. First roving:

[0035]A polyester-cotton mixed roving is prepared by passing the polyester-cotton mixed carded sliver through the first roving.

[0036] FA458 roving frame is selected, and the fed polyester-cotton carded sliver is drawn and thinned by the drafting system of the roving frame, and twisted and wound by the winding system to produce polyester-cotton mixed roving. The drafting system adopts four rollers and double aprons for drafting, and the finishing area is between the front roller and the second roller, and its holding distance is designed to be 40mm；. The main drafting area is between the second roller and the third roller, and the holding distance is equal to the length of the apron frame plus 22 ~ 26, which is designed to be 44mm；; Simple roller drafting is used between the three rollers and the four rollers, and the holding distance is equal to the fiber quality length plus 16 ~ 20, which is designed to be 47 mm.

[0037] 8. Second roving:

[0038] A polyester-cotton roving is prepared by passing a polyester-cotton mixed sliver and a polyester-cotton mixed roving through the second roving.

[0039] FA458 roving frame is selected, and the polyester-cotton mixed roving is embedded in the center of the polyester-cotton carded sliver and then fed by the back roller of the roving frame. Under the action of the draft force of the draft system of the roving frame, the fed polyester-cotton mixed roving and the fibers in the polyester-cotton carded sliver slip each other. In this process, because the polyester-cotton carded sliver has no twist or little twist, the fibers in the carded sliver do not transfer laterally. Because the mixed roving has a certain twist, The interaction force between the fibers in the mixed roving is reduced in the sliding process, and then the fiber strands in the roving are laterally transferred. At this time, because the interaction force between the fibers in the roving does not completely disappear, the fibers in the roving are laterally transferred in the form of strands, and the fibers in the cooked strands and the strands in the roving are mixed with each other in the transfer process. During the mixing process, the single fibers in the cooked sliver are randomly embedded in the fiber strands in the roving, so that there is a certain force between the dispersed fibers in the cooked sliver after being drafted. After being drafted and output, the polyester-cotton roving is made by twisting and winding in the winding system, so that the fiber force in the spun polyester-cotton roving can be enhanced under the same twisting twist through the preserved force among the fibers in the fed mixed roving, thus providing a larger internal friction force field for spinning drafting.

[0040] 9. Spinning:

[0041] Combed polyester-cotton yarn is produced by spinning polyester-cotton roving.

[0042] The Zinser360 spinning frame is selected, and the polyester-cotton roving is drawn and thinned by the drafting system of the spinning frame and twisted and wound by the winding system. During the drafting process, the fed polyester-cotton roving is drawn and thinned under the comprehensive control of the larger internal friction field generated by the force between the fibers in the roving and the external friction field generated by the friction between the drafting assembly and the roving, and then the yarn quality can be improved, including evenness, coarse details, yarn strength and other indicators. In the spinning process, the ring specification PG1, diameter 42mm and traveler RSS 4/0 are selected.

[0043] 10. Winding:

[0044] Combed polyester-cotton spun yarn is wound into a finished product.

[0045] SAVIO automatic winder is selected, and reasonable winding speed is configured to prevent yarn from rubbing with metal parts of equipment and increasing yarn hairiness and neps; Set reasonable yarn cleaning parameters to ensure the removal of yarn defects; In the winding process, the winding speed of 1000m/min, the cleaning parameters of N:3.5, DS:1.88, LS:1.3cm, DL:1.25cm, LL:20cm, -D:16%, -L:16cm are selected.

[0046] Second, the test and results:

[0047] The quality of the yarn produced by this production process is better than that of the conventional process. The comparison table of various parameter properties between the polyester-cotton yarn produced by this process and the polyester-cotton yarn produced by the conventional process is as follows:

[0048] Variety: JC/T60/4018.5tex

[0049]