Production method of cellulose yarn

Abstract

The invention discloses a production method of cellulose yarns, which comprises the following steps: carrying out blowing-carding, two-pass drawing and first roving on tencel fibers to prepare first tencel roving, adopting a core-spun process on second roving, feeding tencel drawn slivers through a rear roller, drafting to obtain tencel fiber strands with the linear density consistent with that of the first roving, and drying the tencel fiber strands to obtain the cellulose yarns. An upper feeding rubber roller and a middle feeding rubber roller which are in pressing contact with the front upper rubber roller and the middle upper rubber roller are additionally arranged at the upper parts of the front upper rubber roller and the middle upper rubber roller respectively; a first tencel rough yarn is driven by the middle feeding rubber roller and then enters a middle roller jaw; the method comprises the following steps of: drawing a tencel fiber strand in a front area after the tencel fiber strand and the tencel fiber strand are converged, so as to obtain a drawn fiber strand comprising a drawn inner fiber strand positioned in the center and a tencel fiber strand positioned on the outer side, driving a first tencel roving by an upper feeding rubber roller, entering a front roller jaw, and converging with the output drawn fiber strand; the twist degree of the outer covering roving, the twist degree of the middle roving and the twist degree of the first tencel roving located in the center are kept consistent, and the tencel roving is drafted and twisted through a spinning frame to obtain the needed spun yarn.

Description

Technical Field

[0001] The invention relates to the new technical field of textiles, in particular to a method for producing cellulose yarn. Background Art

[0002] The spinning process is the last process of yarn formation. It stretches and twists the coarse yarn dozens of times to make it into a yarn with a certain number of features and in line with relevant quality standards. The quality of the yarn ultimately determines the quality of the finished product. At the same time, the spinning process is also the most important process in a cotton textile factory. The size of a textile factory's production scale is expressed by the total number of spindles in the spinning machine. The unit output of the spinning machine reflects the production level of the textile enterprise. The quality of the yarn, the power consumption of raw materials, and labor productivity are the embodiment of the technology and management level of the textile enterprise. The consumption of the spinning process determines the cost of spinning, and the breakage rate of spinning per thousand spindles is an important indicator for enterprise assessment.

[0003] At present, China's textile industry is experiencing a critical period of transformation from labor-intensive to technology-intensive. The use of large draft technology to effectively improve spinning efficiency has become a development trend of modern textile factories. Among them, the use of "heavy quantity, large draft" high-efficiency spinning process with advantages such as good spinning conditions tolerance, wide variety application range, excellent product comprehensive quality and low production cost has become one of the current research hotspots, such as "previous spinning large quantity, fine yarn large draft" as an important feature of the high-efficiency process. In modern textile enterprises, compared with the traditional spinning process, the application of heavy quantity, large draft spinning process can reflect obvious "advantages", but more reasonable and universal technical measures must be taken in key process flows such as combing and drafting to ensure the stability and consistency of product quality. However, at present, the production of heavy quantity roving is directly processed by roving machines, which makes it easy for roving containing more fibers under heavy quantity to produce uneven twist when twisting, thereby affecting the drafting efficiency during fine yarn drafting, and then affecting the final yarn quality. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing cellulose yarn, which adopts a core-wrapping process in the roving process to obtain a heavy-weight roving with consistent internal and external twist, and then achieves a uniform and consistent large draft on a spinning frame, thereby improving the yarn quality.

[0005] The present invention provides a method for producing cellulose yarn, comprising the following steps:

[0006] (1) The Tencel fiber is sequentially subjected to a carding and blowing process, two drawing processes, and a first roving process to obtain a first Tencel roving, and in the second roving process, a core-spun and composite production process is adopted, and the Tencel sliver obtained by the two drawing processes is fed through the rear roller of a roving frame, and sequentially subjected to a rear zone drafting and a front zone drafting of the roving frame to obtain a Tencel sliver having a linear density consistent with that of the first Tencel roving;

[0007] (2) An upper feeding rubber roller and a middle feeding rubber roller are respectively installed on the upper part of the front upper rubber roller and the middle upper rubber roller of the roving frame, which are in close pressing contact with the upper rubber roller. A first-day silk roving is fed from the front part of the middle feeding rubber roller of the roving frame and enters the jaws of the middle roller. At this time, the first-day silk roving is in frictional contact with the middle upper rubber roller at a certain arc and enters the jaws of the middle roller. Therefore, under the drive of the middle upper rubber roller, the first-day silk roving is stably merged with the later-day silk strands output by the rear zone drawing. Moreover, since the first-day silk roving has a certain twist, the first-day silk roving is embedded in the center of the later-day silk strands. After the two are merged, they are jointly drawn in the front zone to obtain the drawn strands.

[0008] (3) During the front-zone drawing process, the Tencel fibers in the first-stage silk roving are concentratedly extracted and speeded under the control of the internal friction field formed by the friction between the fibers to obtain the drawing inner whisker located at the center of the drawing whisker, and the drawing inner whisker retains less than 50% of the twist of the first-stage silk roving. During the front-zone drawing process, the Tencel fibers in the rear-stage Tencel whisker are gradually dispersed and speeded under the control of the external friction field generated by the rollers and the rubber rollers to obtain the Tencel whiskers outside the drawing whisker, and the Tencel whiskers remain in an untwisted state. A first-stage silk roving is fed from the front of the upper feeding rubber roller of the roving machine and enters the jaws of the front roller. At this time, the first-stage silk roving is in friction contact with the front upper rubber roller with a certain arc and then enters To the jaws of the front roller, so that it can stably merge with the output drafting whiskers under the drive of the front upper rubber roller, and because the first-stage silk roving has a certain twist, the first-stage silk roving is embedded in the center of the drafting inner whiskers of the drafting whiskers, and the twisting twist of the second roving is set to be greater than the designed twist of the first-stage silk roving during processing. Under the twisting twist of the second roving, the outer Tencel whiskers are twisted into outer-wrapped rovings, and the middle drafting inner whiskers are twisted into middle rovings, and the first-stage silk roving in the center is wrapped during the twisting process, so as to obtain the Tencel roving with the same twist of the outer-wrapped roving, the middle roving and the first-stage silk roving in the center;

[0009] (4) The obtained Tencel roving is fed into the rear roller of the spinning frame. Under the small stretching effect of the rear stretching zone of the spinning frame, the fiber bundles in the Tencel roving with consistent internal and external twist are pressed by the middle roller and pulled out as a whole, thereby obtaining a first whisker containing more than 80% of the twist of the Tencel roving. Under the large stretching effect of the front stretching zone of the spinning frame, the Tencel fibers in the first whisker with consistent internal and external twist are pressed by the front roller and pulled out individually, thereby obtaining an untwisted Tencel fiber band. The output Tencel fiber band is twisted into a Tencel spun yarn with a certain strength under the twisting twist of the spinning frame. Since the output Tencel fiber band is untwisted and the Tencel fibers are pulled out individually, the fibers in the Tencel fiber band are arranged in a staggered manner, thereby causing a uniform transfer between the fibers in the Tencel spun yarn.

[0010] A method for producing cellulose yarn as described above, wherein, preferably, the selected Tencel fibers are sequentially passed through a reciprocating cotton plucking machine with a bridge-type magnet to grasp the Tencel fibers according to the required mixing ratio, and the Tencel fibers are initially opened and mixed during the grasping process, the metal and sparks in the grasped Tencel fibers are removed through a gold and fire detector, the block impurities in the grasped Tencel fibers are removed through a heavy object separator, the grasped various Tencel fibers are fully mixed through a multi-bin cotton mixer, and the Tencel fibers are opened and removed from impurities during the mixing process, and after in-depth opening, combing and impurity removal by a cotton cleaning machine, a uniform Tencel fiber bundle is obtained, the obtained Tencel fiber bundle is continuously and directly conveyed to a carding machine through a cotton conveying pipeline driven by a conveying fan, and the Tencel combed cotton strips are obtained through the meticulous opening, combing, impurity removal and stripping of the cotton carding machine, and the obtained Tencel combed cotton strips are continuously coiled in a strip drum by a strip coiler.

[0011] A method for producing cellulose yarn as described above, wherein preferably, eight Tencel carded slivers are fed together in the first drawing process, and are drawn and thinned by the drawing system of the drawing frame and then recombined to obtain Tencel semi-ripened slivers with improved fiber straightness;

[0012] In the second drawing process, 8 semi-cooked Tencel strips are fed together, and after being drawn together, they are stretched and thinned by a drawing system to obtain cooked Tencel strips with improved strip uniformity.

[0013] A method for producing cellulose yarn as described above, wherein preferably, the rear zone drafting distribution in the first and second drawing passes adopts a reverse drafting process, and the rear zone drafting of the first drawing pass is larger than that of the second drawing pass.

[0014] A method for producing cellulose yarn as described above, wherein preferably, the first roving process uses a suspended spindle roving frame, and the drafting system of the roving frame in the first roving process adopts a four-roller drafting form.

[0015] A method for producing cellulose yarn as described above, wherein preferably, the second roving process uses a suspended spindle roving frame, and the drafting system of the roving frame in the second roving process adopts a three-roller double-apron drafting structure.

[0016] A method for producing cellulose yarn as described above, wherein preferably, the three rows of rollers in the second roving process respectively include a rear lower roller, a middle lower roller, and a front lower roller, and a rear upper rubber roller, a middle upper rubber roller, and a front upper rubber roller are respectively arranged on the upper parts of the rear lower roller, the middle lower roller, and the front lower roller, and the rear upper rubber roller, the middle upper rubber roller, and the front upper rubber roller are installed on a pressure component, and a middle embedded gripper is respectively arranged on the pressure component located directly above the middle upper rubber roller and the front upper rubber roller. , an upper embedded grab, a first upper guide rubber roller is installed on the upper part of the front upper rubber roller, the first upper guide rubber roller is detachably connected to the pressurizing assembly through the upper embedded grab, and the first upper guide rubber roller is in close pressing contact with the front upper rubber roller after the connection, and a second upper guide rubber roller is installed on the upper part of the middle upper rubber roller, the second upper guide rubber roller is detachably connected to the pressurizing assembly through the middle embedded grab, and the second upper guide rubber roller is in close pressing contact with the middle upper rubber roller after the connection.

[0017] A method for producing cellulose yarn as described above, wherein, preferably, the diameter of the first upper guide rubber roller is larger than the diameter of the front upper rubber roller, a first guide groove is opened in the middle of the length of the first upper guide rubber roller, the first guide groove is arranged along a circumference of the outer side surface of the first upper guide rubber roller, and the diameter of the first upper guide rubber roller located in the first guide groove is equal to the diameter of the front upper rubber roller.

[0018] In the method for producing cellulose yarn as described above, preferably, the diameter of the second upper guide rubber roller is equal to the diameter of the middle upper rubber roller.

[0019] Compared with the prior art, the present invention adopts core-skinning and composite technology in the roving process to produce roving with uniform internal and external twist, thereby achieving consistency and high efficiency in spun yarn drafting, thereby greatly improving the strength uniformity of the spun Tencel spun yarn. DETAILED DESCRIPTION

[0020] The reference examples are illustrative and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0021] The present invention relates to a production method of cellulose yarn, wherein the first cellulose roving is obtained by subjecting the tencel fibers to a carding and combing unit, two drawing steps and a first roving process in sequence, and a core-wrapping and composite production process is adopted in the second roving process, the tencel sliver obtained by the two drawing steps is fed through the rear roller of a roving frame, and is successively drafted in the rear zone and the front zone of the roving frame to obtain a tencel sliver having a linear density consistent with that of the first cellulose roving, and an upper feeding rubber roller and a middle feeding rubber roller which are in close pressing contact with the front upper rubber roller and the middle upper rubber roller of the roving frame are respectively installed, and a first cellulose roving is fed from the front part of the middle feeding rubber roller of the roving frame and enters the jaws of the middle roller, and at this time, the first cellulose roving is in friction contact with the middle upper rubber roller at a certain arc and enters the middle roller. The first silk roving has a certain twist, so that the first silk roving is embedded in the center of the rear tencel whisker. After the two are combined, they are drafted in the front zone to obtain a stretched whisker. During the front zone drafting, the Tencel fibers in the first silk roving are concentratedly extracted and speed-changed under the control of the internal friction field formed by the friction between the fibers to obtain the stretched inner whisker located at the center of the stretched whisker, and the stretched inner whisker retains less than 50% of the twist of the first silk roving. During the front zone drafting, the Tencel fibers in the rear tencel whisker are gradually dispersed and speed-changed under the control of the external friction field generated by the rollers and the rubber rollers to obtain the Tencel whiskers outside the stretched whisker, and the Tencel whiskers maintain In an untwisted state, a first-day silk roving is fed from the front of the upper feeding rubber roller of the roving machine and enters the jaws of the front roller. At this time, the first-day silk roving contacts the front upper rubber roller with a certain arc and then enters the jaws of the front roller, so that it can stably merge with the output drafting whiskers under the drive of the front upper rubber roller. Since the first-day silk roving has a certain twist, the first-day silk roving is embedded in the center of the drafting inner whiskers of the drafting whiskers, and the twisting twist of the second roving is set to be greater than the designed twist during the processing of the first-day silk roving. Under the twisting twist of the second roving, the Tencel whiskers on the outside are twisted into outer covered rovings, and the drafting inner whiskers in the middle are twisted into middle rovings, and during the twisting process, the first-day silk roving located in the center is twisted into outer covered rovings. The Tencel roving is wrapped with a Tencel roving, thereby obtaining a Tencel roving with consistent twist among the outer wrapped roving, the middle roving and the first Tencel roving located in the center, and then the obtained Tencel roving is fed by the rear roller of the spinning frame. Under the small drafting action of the rear drafting zone of the spinning frame, the fiber bundles in the Tencel roving with consistent internal and external twist are pressed by the middle roller to achieve overall extraction, thereby obtaining a first whisker containing more than 80% of the twist of the Tencel roving. Under the large drafting action of the front drafting zone of the spinning frame, the Tencel fibers in the first whisker with consistent internal and external twist are pressed by the front roller to achieve single extraction, thereby obtaining an untwisted Tencel fiber band. The output Tencel fiber band is twisted into a Tencel yarn with a certain strength under the twisting twist of the spinning frame.Since the output Tencel fiber band is untwisted and the Tencel fibers are drawn out individually, the fibers in the Tencel fiber band are arranged in a staggered manner, so that the fibers in the Tencel spun yarn are evenly transferred, and then the strength uniformity of the spun Tencel spun yarn is greatly improved, comprising the following steps:

[0022] Step 1: Raw material selection: Select G100 Tencel with a linear density of 1.4dtex, an average length of 40mm, a dry strength of 36.6cN / dtex, a wet strength of 37.2cN / dtex, and an oil content of 0.32%.

[0023] The second step: cleaning and combing: the selected Tencel fibers are sequentially picked up by a reciprocating cotton plucking machine with a bridge-type magnet to realize the picking of Tencel fibers according to the required mixing ratio, and the Tencel fibers are initially opened and mixed during the picking process, the metal and sparks in the picked Tencel fibers are removed by a gold and fire detector, the block impurities in the picked Tencel fibers are removed by a heavy object separator, the various Tencel fibers picked up are fully mixed by a multi-bin cotton blending machine, and the Tencel fibers are opened and removed during the mixing process, and the Tencel fibers are thoroughly opened, combed, and removed by the cotton plucking machine to obtain uniform Tencel fiber bundles, which are continuously and directly transported to the cotton combing machine through the cotton conveying pipeline driven by the conveying fan, and are carefully opened, combed, removed, and formed into strips by the cotton combing machine. Tencel carded slivers are obtained, and the obtained Tencel carded slivers are continuously coiled in the sliver can by the coiler; in the cotton cleaning process, in order to prevent the fiber layer from sticking and the fiber from being damaged, the speed of the cotton grabbing beater is kept low. Since the selected Tencel fiber contains less impurities, the dust bar spacing in the cotton cleaning machine is set small, which is set to 5mm. Since the selected Tencel fiber is long and has good uniformity, the spacing between the comprehensive beater and the dust bar in the cotton cleaning machine is too small, which will cause the channel to be blocked, so it is set larger, with an inlet of 10mm and an outlet of 18mm; in the cotton carding process, the process principle of "low speed of the licker-in roller and high speed of the cylinder" is adopted to improve the quality of the carded slivers. According to the linear speed ratio, the licker-in roller speed is set to 840r / min. The cylinder speed is proportional to the effect of the combing effect, which is beneficial to the product quality In order to achieve the two goals of effectively avoiding fiber damage and reducing short fibers, the cylinder speed is appropriately reduced, and the motor pulley diameter is selected to be 175mm, and the corresponding cylinder speed is 458r / min. Since the selected Tencel has only a few bundle fiber defects, the cover plate speed is set low, set to 95mm / min. Since the selected Tencel fiber is long and has good length uniformity, the linear speed ratio of the cylinder and the doffer is set large between 1.8 and 1.94. Since the selected Tencel fiber is long and has good uniformity, the spacing between the licker-in roller and the cotton feeding plate is set large, set to 0.26mm, and the spacing between the licker-in roller and the carding plate is between 0.4 and 0.5mm. The licker-in roller speed is low, and the spacing is adapted to it. , it is too small, choose 0.46mm, the distance between the licker-in roller and the cylinder is between 0.12-0.2mm, a small distance will facilitate the transfer of fibers to the cylinder needle surface, but too small a distance may cause collisions between needles, so it is selected as 0.14mm, the distance between the licker-in roller and the dust removal knife is between 0.32-0.44mm, too large a distance will increase the burden of the second impurity falling area, so it is selected as 0.35mm, the entrance distance between the licker-in roller and the small leak bottom is adjusted between 4.77mm-9.54mm, because the selected Tencel fiber contains less impurities, the entrance distance is appropriately enlarged and selected as 7.1mm. The outlet distance is adjusted between 0.4-1.6mm, too large a distance will cause mesh blockage, so it is too small, choose 0.8mm, reduce the distance between the cylinder and the doffer, thereby improving the transfer capacity of the doffer and reducing the fiber load in the working area, set to 0.12mm, in order to control the cotton knots, the distance between the cylinder and the cover plate is selected in turn as 0.35mm, 0.30mm, 0.30mm, 0.30mm, 0.25mm, the distance between the cylinder and the rear fixed cover plate is larger, set to 0.51mm, 0.44mm, 0.24mm, so as to reduce the damage to the Tencel fiber, the distance between the cylinder and the front fixed cover plate is 0.2 -0.25mm, the smaller one is selected, set to 0.21mm, to prevent weakening the combing efficiency of the fiber. To prevent the air pressure of the small leak bottom from causing the rear cotton drop, the distance between the cylinder and the large leak bottom is from large to small from the entrance to the exit, 6.5mm at the entrance, 1.6mm in the middle, and 0.78mm at the exit. Due to the low impurity content of the Tencel used, the upper distance between the cylinder and the front upper cover plate is appropriately reduced, and the upper distance is selected to be 0.45mm and the lower distance is 0.82mm. The upper distance between the cylinder and the front lower cover plate is set to 0.85mm and the lower distance is set to 0.6mm.

[0024] The third step: drawing: the Tencel carded slivers obtained in the second step are drawn in two stages to obtain Tencel cooked slivers. In the first stage of drawing, eight Tencel carded slivers obtained in the second step are fed together, and after being stretched and thinned by the drawing system of the drawing frame, they are re-combined to obtain Tencel semi-cooked slivers with improved fiber straightness; in the second stage of drawing, eight Tencel semi-cooked slivers are fed together, and after being combined, they are stretched and thinned by the drawing system to obtain Tencel cooked slivers with improved yarn uniformity; the first stage The drafting distribution in the back zone of the drawing and the second drawing adopts the reverse drafting process. The drafting in the back zone of the first drawing is larger than that of the second drawing. Because the product is Tencel, the drafting in the back zone is larger than that of pure cotton. In the first drawing, a Φ45 gear is selected, and the corresponding drafting in the back zone is 1.57 times. In the second drawing, a Φ56 gear is selected, and the corresponding drafting in the back zone is 1.25 times. The back tension drafting is a fixed value of 1.015. In order to avoid unexpected drafting, the back pressure The roller input pulley is selected with a diameter of 47, and the corresponding front tension draft is 1.011 times. The gear with a diameter of 78.5 is selected, and the corresponding guide tension draft is 1.006 times. The coil tension draft is related to the diameter of the can and the rear pressure roller input pulley. The can diameter is 500, and the corresponding coil tension draft is 1.002 times. The two-pass drawing adopts the process principle of "heavy pressure, large gauge, slow speed, and small tension". The roller holding distance is selected according to the drafting form and quality length. The holding distance of the front and middle rollers is between the quality length of the Tencel fiber + 6~12mm, and the holding distance of the middle and rear rollers is between the quality length of the Tencel fiber + 10~15mm. The size of the trumpet head diameter is determined by the weight of the sliver, and when the raw material is Tencel, a larger grip is selected, and the trumpet head diameter of the first drawing is set to be slightly smaller than that of the second drawing, where the first drawing is set to 2.7mm and the second drawing is set to 2.9mm.

[0025] Step 4: First roving: The Tencel sliver obtained in the third step is stretched and thinned by the drafting system of the first roving process and twisted and wound by the twisting system to obtain the first first roving with a certain strength and a dry weight within 5g / 10m. The first roving process uses a suspended spindle roving machine. Since the selected Tencel A100 has good length uniformity, the twist coefficient of the first roving process is set to be relatively small; since the selected roving machine is a suspended spindle roving machine, the roving quantity is relatively light, so the spindle speed is relatively small and is set to 700r / min. According to the quantity of the first first roving, the roller pressure is set to 12, 18, 15, and 15daN respectively. According to the selected four-roller drafting form and the corresponding Tencel fiber raw material, the roller holding distance is selected to be 38mm, 54mm, and 59mm respectively. The jaw spacing is related to the quantity. According to the quantity, the double rubber ring jaw spacing range is between 2-4mm.

[0026] Step 5: Second roving: The Tencel sliver obtained in the third step and the first Tencel roving obtained in the fourth step are jointly subjected to the second roving process to obtain the required Tencel roving. The second roving process uses a suspended spindle roving frame. The drafting system of the roving frame in the second roving process adopts a three-roller double-apron drafting structure. The three rows of rollers include a rear lower roller, a middle lower roller, and a front lower roller. A rear upper rubber roller, a middle upper rubber roller, and a front upper rubber roller are respectively arranged on the upper parts of the rear lower roller, the middle lower roller, and the front lower roller. The rear upper rubber roller, the middle upper rubber roller, and the front upper rubber roller are installed on the pressure assembly. A middle embedded grab and an upper embedded grab are respectively arranged on the pressure assembly located directly above the middle upper rubber roller and the front upper rubber roller. A first upper guide rubber roller is installed on the upper part of the front upper rubber roller. The first upper guide rubber roller passes through an upper embedded The grab and pressure assembly is detachably connected, and the first upper guide rubber roller is in close pressing contact with the front upper rubber roller after being connected, the diameter of the first upper guide rubber roller is larger than the diameter of the front upper rubber roller, a first guide groove is provided in the middle part of the length of the first upper guide rubber roller, the first guide groove is arranged along a circumference of the outer side surface of the first upper guide rubber roller, the diameter of the first upper guide rubber roller in the first guide groove is equal to the diameter of the front upper rubber roller, a second upper guide rubber roller is installed on the upper part of the middle upper rubber roller, the second upper guide rubber roller is detachably connected through an embedded grab and pressure assembly, and the second upper guide rubber roller is in close pressing contact with the middle upper rubber roller after being connected, the diameter of the second upper guide rubber roller is equal to the diameter of the middle upper rubber roller, and when spinning, the pressure assembly is pressed downward, so that the rear lower roller The Tencel sliver is pressed and fed between the rear lower roller and the rear upper rubber roller of the roving machine, and then is pressed and output between the middle lower roller and the middle upper rubber roller in turn, and is stretched in the rear stretching zone to obtain the rear Tencel sliver. The rear Tencel sliver is pressed and output between the front lower roller and the front upper rubber roller, and is stretched in the front stretching zone to obtain the Tencel sliver. The linear density of the Tencel sliver is kept consistent with the linear density of the first Tencel roving by setting the stretching multiple. The obtained Tencel sliver is continuously output from the stretching system driven by the front lower roller and the front upper rubber roller. During the stretching process, a first Tencel roving obtained in the fourth step is stretched in the first stretching zone. The second upper guide rubber roller feeds, during this process, the first silk roving bypasses the front of the second upper guide rubber roller and the rear of the middle upper rubber roller in turn, and finally enters the middle jaw between the middle lower roller and the middle upper rubber roller. At this time, the middle lower roller rotates and then drives the middle upper rubber roller in close contact with it to rotate in the same speed and in the opposite direction. The rotation of the middle upper rubber roller then drives the second upper guide rubber roller in close contact with it to rotate in the same speed and in the opposite direction. Therefore, the second upper guide rubber roller and the middle lower roller keep rotating at the same speed and in the same direction. The rotation of the second upper guide rubber roller then drives the first silk roving to be actively fed in. The fed first silk roving is then driven by the middle upper rubber roller and enters the middle jaw. At this time, the first silk roving merges with the acquired silk strands drawn out from the rear area, and because the first silk roving has a certain twist,As a result, the first-day silk roving is pressed and embedded into the center of the subsequent Tencel whisker. After the two merge, they are drafted in the front zone to obtain the draft whisker. During the front zone drafting process, the Tencel fibers in the first-day silk roving are concentratedly extracted and speeded under the control of the internal friction field formed by the friction between the fibers to obtain the draft inner whisker located at the center of the draft whisker, and the draft inner whisker retains less than 50% of the twist of the first-day silk roving. During the front zone drafting process, the Tencel fibers in the subsequent Tencel whisker are gradually dispersed and speeded under the control of the external friction field generated by the rollers and rubber rollers to obtain the Tencel whiskers outside the draft whisker, and the Tencel whiskers remain in a twist-free state.

[0027] At the same time, during the drafting process, a first-day silk roving produced in the fourth step is fed through the first upper guide rubber roller. During this process, the first-day silk roving passes through the first guide groove in front of the first upper guide rubber roller, bypasses the rear of the front upper rubber roller, and finally enters the front jaw between the front lower roller and the front upper rubber roller. At this time, the front lower roller rotates and then drives the front upper rubber roller in close contact with it to rotate in the same speed and opposite direction. The rotation of the front upper rubber roller then drives the upper guide rubber roller in close contact with it to rotate in the same speed and opposite direction. Therefore, the upper guide rubber roller and the front lower roller keep rotating at the same speed and in the same direction. The feeding point of the first-day silk roving is positioned through the first guide groove, and contact friction is generated between the first-day silk roving and the front upper rubber roller, thereby generating a feeding effect on the first-day silk roving. The guiding force is input, and the rotating front jaw drives the first day silk roving to be actively fed, and the input first day silk roving merges with the drafting whisker output by the drafting system at the jaw of the front roller. At this time, since the first day silk roving has a certain twist, the first day silk roving is embedded in the center of the drafting inner whisker of the drafting whisker, and the twisting twist of the second roving is set to be greater than the designed twist during the processing of the first day silk roving. Under the twisting twist of the second roving, the Tencel whisker on the outside is twisted into an outer wrapped roving, and the drafting inner whisker in the middle is twisted into an intermediate roving, and the first day silk roving in the center is wrapped during the twisting process, so as to obtain the Tencel roving with consistent twist of the outer wrapped roving, the intermediate roving and the first day silk roving in the center.

[0028] Step 6: Spinning: The Tencel roving obtained in the fifth step is stretched and thinned by the drafting system of the spinning process and twisted and wound by the twisting system to obtain Tencel spun yarn with a certain strength and a linear density of less than 9.8tex. The spinning process uses a ring spinning frame, and the drafting system of the spinning frame adopts a three-roller double-apron drafting form. The three rows of rollers are the front lower roller, the middle lower roller, and the rear lower roller. The front upper rubber roller, the middle upper rubber roller, and the rear upper rubber roller are respectively arranged on the front lower roller, the middle lower roller, and the rear lower roller. The front upper rubber roller, the middle upper rubber roller, and the rear upper rubber roller are installed on the pressure component. When in use, the pressure component is pressed down, so that the front lower roller and the front upper rubber roller are closely pressed and contacted, the middle lower roller and the middle upper rubber roller are closely pressed and contacted, and the rear lower roller and the rear upper rubber roller are closely pressed and contacted. Under the pressure contact, the Tencel roving is pressed and fed between the rear lower roller and the rear upper rubber roller, and then pressed and outputted between the middle lower roller and the middle upper rubber roller. During this period, it is subjected to the drafting effect of the rear drafting zone. Under the small drafting effect of the rear drafting zone, the fibers in the Tencel roving first move slowly in accordance with the linear speed of the rear lower roller. At this time, the Tencel fibers move slowly when they are held between the rear lower roller and the rear upper rubber roller. When the tail end of the Tencel fibers is separated from the grip of the rear lower roller and the rear upper rubber roller and the head end has not yet been held by the middle lower roller and the middle upper rubber roller, since the internal and external twist of the Tencel roving is consistent and contains more Tencel fibers, the holding force between the fibers is large and evenly distributed, thereby forming a stable internal friction field, which then makes the Tencel fibers at this time have a larger internal friction force. Under the action of the field, the fiber still maintains slow movement. When the fiber is held by the middle lower roller and the middle upper rubber roller, the fiber performs fast movement consistent with the linear speed of the middle lower roller. In this process, due to the large holding force between the Tencel fibers in the Tencel roving and the small stretching multiple in the rear stretching zone, the Tencel fiber bundle in the Tencel roving is transformed from slow movement to fast movement as a whole. That is, the Tencel fiber bundle is pressed by the middle roller to achieve overall extraction, and the twist of the Tencel fiber bundle is retained during the extraction process, thereby obtaining the first whisker containing more than 80% of the twist of the Tencel roving and with a lower linear density than that of the Tencel roving. The output first whisker is then pressed and output between the front lower roller and the front upper rubber roller, during which it is subjected to the stretching effect of the front stretching zone. Under the large drafting action in the drafting zone, the fibers in the first sliver first move slowly in accordance with the linear speed of the middle lower roller. At this time, when the tencel fibers are held between the middle lower roller and the middle upper rubber roller, they move slowly. When the tail end of the tencel fibers is released from the grip of the middle lower roller and the middle upper rubber roller and the head end has not yet been held by the front lower roller and the front upper rubber roller, since the internal and external twist of the first sliver is consistent and contains more tencel fibers, the holding force between the fibers is large and evenly distributed, thereby forming a stable internal friction field, and then the tencel fibers at this time still keep moving slowly under the action of the larger internal friction field. When the fibers are held by the front lower roller and the front upper rubber roller, the fibers move quickly in accordance with the linear speed of the front lower roller. In this process,Due to the large drafting multiple in the front drafting zone, the Tencel fiber bundle in the first whisker is transformed from slow motion to fast motion in the form of a single fiber, that is, the Tencel single fiber is pressed by the front roller to achieve single-strand extraction, and the twist of the Tencel fiber is completely removed during the extraction process, so that the Tencel fiber band is twist-free and the linear density is greatly reduced compared with the first whisker. The output Tencel fiber band is twisted into a Tencel spun yarn with a certain strength under the twisting twist of the spinning machine, and because the output Tencel fiber band is twist-free and the Tencel fiber is extracted individually, the fibers in the Tencel fiber band are arranged in a staggered manner, so that the fibers in the Tencel spun yarn are evenly transferred, and then the strength uniformity of the spun Tencel spun yarn is greatly improved.

[0029] Step 7: Winding: The Tencel tube yarn obtained in the sixth step is rewound through the winding machine to obtain large-package Tencel yarn. The SMARO-E winding machine is selected. Since the selected Tencel A100 fiber is easy to fibrillate, the cotton knots and hairiness of the yarn are likely to increase to a large extent under the influence of the winding process, the "low speed, low tension" process principle is adopted to reduce hairiness and cotton knots.

[0030] Taking the preparation of Tencel yarn with a linear density of 9.8tex as an example, the corresponding process parameters are as follows:

[0031] (1) Raw material selection:

[0032]

[0033] (2) Design of key process parameters:

[0034] Blowing and carding:

[0035]

[0036] Carding:

[0037]

[0038]

[0039] Drawing:

[0040]

[0041] First roving:

[0042]

[0043]

[0044] Second roving:

[0045]

[0046] For comparative analysis, the traditional roving production process is used to produce Tencel roving, followed by the corresponding spun yarn processing. The process parameters of the traditional roving process are set as follows:

[0047]

[0048] Fine yarn:

[0049]

[0050]

[0051] Winding:

[0052]

[0053] (3) Yarn quality

[0054]

[0055] It is easy to see from the yarn quality test results that the patented method achieves the production of heavy-weight roving with consistent internal and external twist, so that the roving is subjected to uniform and consistent large drafting in the spun yarn processing, thereby improving the yarn quality, especially the uniformity of the yarn, including the CV and strength CV.

Claims

1. A method for producing cellulose yarn, characterized in that: The following steps are involved: (1) The Tencel fiber is sequentially subjected to a carding and blowing process, two drawing processes, and a first roving process to obtain a first Tencel roving, and in the second roving process, a core-spun and composite production process is adopted, and the Tencel sliver obtained by the two drawing processes is fed through the rear roller of a roving frame, and sequentially subjected to a rear zone drafting and a front zone drafting of the roving frame to obtain a Tencel sliver having a linear density consistent with that of the first Tencel roving; (2) An upper feeding rubber roller and a middle feeding rubber roller are respectively installed on the upper part of the front upper rubber roller and the middle upper rubber roller of the roving frame, which are in close pressing contact with the upper rubber roller. A first-day silk roving is fed from the front part of the middle feeding rubber roller of the roving frame and enters the jaws of the middle roller. At this time, the first-day silk roving is in frictional contact with the middle upper rubber roller at a certain arc and enters the jaws of the middle roller. Therefore, under the drive of the middle upper rubber roller, the first-day silk roving is stably merged with the later-day silk strands output by the rear zone drawing. Moreover, since the first-day silk roving has a certain twist, the first-day silk roving is embedded in the center of the later-day silk strands. After the two are merged, they are jointly drawn in the front zone to obtain the drawn strands. (3) During the front-zone drawing process, the Tencel fibers in the first-stage silk roving are concentratedly extracted and speeded under the control of the internal friction field formed by the friction between the fibers to obtain the drawing inner whisker located at the center of the drawing whisker, and the drawing inner whisker retains less than 50% of the twist of the first-stage silk roving. During the front-zone drawing process, the Tencel fibers in the rear-stage Tencel whisker are gradually dispersed and speeded under the control of the external friction field generated by the rollers and the rubber rollers to obtain the Tencel whiskers outside the drawing whisker, and the Tencel whiskers remain in an untwisted state. A first-stage silk roving is fed from the front of the upper feeding rubber roller of the roving machine and enters the jaws of the front roller. At this time, the first-stage silk roving is in friction contact with the front upper rubber roller with a certain arc and then enters To the jaws of the front roller, so that it can stably merge with the output drafting whiskers under the drive of the front upper rubber roller, and because the first-stage silk roving has a certain twist, the first-stage silk roving is embedded in the center of the drafting inner whiskers of the drafting whiskers, and the twisting twist of the second roving is set to be greater than the designed twist of the first-stage silk roving during processing. Under the twisting twist of the second roving, the outer Tencel whiskers are twisted into outer-wrapped rovings, and the middle drafting inner whiskers are twisted into middle rovings, and the first-stage silk roving in the center is wrapped during the twisting process, so as to obtain the Tencel roving with the same twist of the outer-wrapped roving, the middle roving and the first-stage silk roving in the center; (4) The obtained Tencel roving is fed into the rear roller of the spinning frame. Under the small stretching effect of the rear stretching zone of the spinning frame, the fiber bundles in the Tencel roving with consistent internal and external twist are pressed by the middle roller and pulled out as a whole, thereby obtaining a first whisker containing more than 80% of the twist of the Tencel roving. Under the large stretching effect of the front stretching zone of the spinning frame, the Tencel fibers in the first whisker with consistent internal and external twist are pressed by the front roller and pulled out individually, thereby obtaining an untwisted Tencel fiber band. The output Tencel fiber band is twisted into a Tencel spun yarn with a certain strength under the twisting twist of the spinning frame. Since the output Tencel fiber band is untwisted and the Tencel fibers are pulled out individually, the fibers in the Tencel fiber band are arranged in a staggered manner, thereby causing a uniform transfer between the fibers in the Tencel spun yarn.

2. A method for producing cellulose yarn according to claim 1, characterized in that: The selected Tencel fibers are sequentially passed through a reciprocating cotton plucking machine with a bridge-type magnet to grasp the Tencel fibers according to the required mixing ratio, and the Tencel fibers are initially opened and mixed during the grasping process, the metal and sparks in the grasped Tencel fibers are removed through a gold and fire detector, the block impurities in the grasped Tencel fibers are removed through a heavy object separator, the grasped various Tencel fibers are fully mixed through a multi-bin cotton mixer, and the Tencel fibers are opened and removed from impurities during the mixing process, and after in-depth opening, combing and impurity removal by a cotton cleaning machine, a uniform Tencel fiber bundle is obtained, the obtained Tencel fiber bundle is driven by a conveying fan and continuously and directly conveyed to a carding machine through a cotton conveying pipeline, and the Tencel carding sliver is obtained through the meticulous opening, combing, impurity removal and stripping of the carding machine, and the obtained Tencel carding sliver is continuously coiled in a sliver cylinder through a sliver coiler.

3. The method for producing cellulose yarn according to claim 2, characterized in that: In the first drawing process, eight Tencel carded slivers are fed together, and after being stretched and thinned by the drawing system of the drawing frame, they are re-combined to obtain Tencel semi-ripened slivers with improved fiber straightness; In the second drawing process, eight semi-cooked Tencel strips are fed together, and after being drawn together, they are stretched and thinned by a drawing system to obtain cooked Tencel strips with improved strip uniformity.

4. A method for producing cellulose yarn according to claim 3, characterized in that: The drafting distribution in the rear area of ​​the first-pass drawing and the second-pass drawing adopts a reverse drafting process, and the drafting in the rear area of ​​the first-pass drawing is larger than that of the second-pass drawing.

5. The method for producing cellulose yarn according to claim 1, characterized in that: The first roving process uses a suspended spindle roving frame, and the drafting system of the roving frame in the first roving process adopts a four-roller drafting form.

6. The method for producing cellulose yarn according to claim 1, characterized in that: The second roving process uses a suspended spindle roving frame, and the drafting system of the roving frame in the second roving process uses a three-roller double-apron drafting structure.

7. A method for producing cellulose yarn according to claim 6, characterized in that: The three rows of rollers in the second roving process include a rear lower roller, a middle lower roller, and a front lower roller, respectively. A rear upper rubber roller, a middle upper rubber roller, and a front upper rubber roller are respectively arranged on the upper parts of the rear lower roller, the middle lower roller, and the front lower roller. The rear upper rubber roller, the middle upper rubber roller, and the front upper rubber roller are installed on a pressure assembly, and a middle embedded grab and an upper embedded grab are respectively arranged on the pressure assembly located directly above the middle upper rubber roller and the front upper rubber roller. A first upper guide rubber roller is installed on the upper part of the front upper rubber roller, and the first upper guide rubber roller is detachably connected to the pressure assembly through the upper embedded grab, and the first upper guide rubber roller is in close pressing contact with the front upper rubber roller after being connected. A second upper guide rubber roller is installed on the upper part of the middle upper rubber roller, and the second upper guide rubber roller is detachably connected to the pressure assembly through the middle embedded grab, and the second upper guide rubber roller is in close pressing contact with the middle upper rubber roller after being connected.

8. A method for producing cellulose yarn according to claim 7, characterized in that: The diameter of the first upper guide rubber roller is greater than the diameter of the front upper rubber roller. A first guide groove is opened in the middle of the length of the first upper guide rubber roller. The first guide groove is arranged along a circumference of the outer side surface of the first upper guide rubber roller. The diameter of the first upper guide rubber roller located in the first guide groove is equal to the diameter of the front upper rubber roller.

9. The method for producing cellulose yarn according to claim 7, characterized in that: The diameter of the second upper guide rubber roller is equal to the diameter of the middle upper rubber roller.

Images