A method for the efficient production of fancy yarns

Abstract

The application discloses a high-efficiency production method of fancy yarn, which comprises the following steps: first step, cotton assorting; second step, scutcher; third step, pre-drawing; fourth step, mixed drawing; fifth step, roving; and sixth step, spinning. The tension gathering device and the fiber gathering device are used in the drafting system of the roving process, so that the heavy-drafting roving processing under the heavy-drafting sliver feeding is realized; in the spinning process, the strong-twisted polyester-viscose blended roving is drafted and untwisted between the feeding roller pair and the back roller pair, then the polyester-viscose blended roving with controllable feeding and the polyester-viscose blended roving with continuous feeding are kept with similar twist when meeting at the back lower roller of the drafting system of the spinning machine, so that the drafting effect of the slub part is improved, the drafting system composed of the back roller, the middle roller and the front roller is not controlled, the stable production of the fancy yarn with the adjustable slub thickness and length under the roving feeding with the fixed quantity is realized, and the spinning efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new yarn, in particular to a high-efficiency production method of fancy yarn. BACKGROUND

[0002] With the development of social economy, people's living standards continue to improve, for clothing textiles, in addition to the pursuit of wearing comfort, more and more attention is paid to its fashion and functionality, and the pursuit of unique style and various functions, such as antibacterial, anti-static and other functions. In order to meet the needs of consumers, it is an important task for the textile industry to constantly explore new yarns and fabrics. With the development of science and technology, the competition in the textile market is becoming more and more fierce, and various manufacturers are constantly developing towards high-end, high-grade, high-efficiency and high-value-added in order to maximize profits.

[0003] Slub yarn is a kind of fancy yarn with irregular slub type thickness, which has very characteristic structure and can be combined with other new spinning methods to make fabrics with unique appearance and performance, meeting the yarn requirements of fabric and clothing for novelty and difference. Slub yarn has been widely used in clothing, decorative products and other products, and is more and more favored by people, and has strong competitiveness and development value in the market.

[0004] At present, the production of slub yarn is generally carried out on a modified ring spinning frame, which changes the transmission of the drafting system of the spinning frame, that is, the original middle and back roller transmission is changed to separate motor transmission, so that the change of the draft ratio in the front drafting zone is realized by the unified speed change of the middle and back roller, and then the production of slub yarn with different thickness effects is realized. By adjusting the draft ratio, the speed change of the fiber in the drafting zone is caused, and then the yarn quality fluctuates. Since the draft ratio of the front drafting zone needs to be dynamically adjusted, the draft ratio cannot be too large, otherwise it will seriously affect the yarn quality, so that the spinning efficiency is low, and at the same time the twist factors of the slub yarn and the base yarn processed are inconsistent.

[0005] Polyester-viscose blended 21-spun slub yarn is mainly used in knitted products, home textiles and decorative textiles. When designing the process of this kind of yarn, the production cost is reduced as much as possible, the production process is shortened, and unnecessary cost loss is reduced on the basis of meeting the requirements of yarn for textiles, dyeing and weaving. SUMMARY

[0006] The purpose of the present application is to provide a high-efficiency production method of fancy yarn, so that the draft ratio of the front drafting zone in the production process of fancy yarn can be controlled dynamically, and the high-efficiency production of fancy yarn is realized.

[0007] The present application provides a high-efficiency production method of fancy yarn, comprising the following steps:

[0008] First step: cotton distribution: polyester and viscose are respectively used single mags raw materials to avoid yellow and white yarn or cloth surface horizontal bar, a small amount of T / R roving strip and T / R mixed strip is added when raw materials are selected and distributed;

[0009] Second step: carding unit: the selected polyester and viscose fibers are respectively sequentially subjected to the cotton grabbing of the attached bridge type magnet, the multifunctional separator, the multi-bin cotton mixer attached to the air fan, the cotton cleaner attached to the magnet device, and then enter the carding machine to form the polyester carded sliver and the viscose carded sliver under the driving of the combination of the condensing device + high device + fan;

[0010] Third step: pre-drawing: the polyester carded sliver and the viscose carded sliver prepared in the second step are respectively drawn and thinned by the drafting system of the pre-drawing, and then recombined to prepare the polyester pre-drawing and the viscose pre-drawing with improved evenness of sliver;

[0011] Fourth step: mixed drawing: the polyester pre-drawing and the viscose pre-drawing prepared in the third step are subjected to three-drawing to prepare the polyester-viscose drawing sliver;

[0012] Fifth step: roving: the polyester-viscose drawing sliver prepared in the fourth step is subjected to drafting and thinning by the drafting system of the roving machine, and then twisted and wound by the twisting system to prepare the polyester-viscose roving with a certain strength and a weight of more than 7g / 10m;

[0013] The drafting system adopts four-roller double-short apron drafting structure, and heavy-draft polyester-viscose slubbing with a draft of 30g / 5m or more is fed in. The heavy-draft polyester-viscose slubbing after feeding is firstly introduced into the rear arrangement area of the drafting system, and a tension gathering device is arranged in the rear arrangement area. Under the action of the rear arrangement area, a large amount of fibers in the polyester-viscose slubbing are subjected to a certain tension, so that a certain extrusion force is generated between the fibers, and the fibers are further extruded to the center under the action of the tension gathering device, so that polyester-viscose arranged fiber bundles are obtained. The polyester-viscose arranged fiber bundles are then introduced into the main drafting area. In the main drafting area, the polyester-viscose arranged fiber bundles are stably moved forward under the combined action of the internal friction field formed by the extrusion force of a large amount of fibers and the external friction field generated by the apron on the fibers. When the external friction field of the apron is separated, the polyester-viscose arranged fiber bundles continue to be stably moved forward under the control of the internal friction field. When approaching the front jaw of the main drafting area with high linear speed, part of the fibers are speeded up, so that a certain amount of fibers are extracted as a whole, and polyester-viscose drafted fiber bundles are obtained. The polyester-viscose drafted fiber bundles are then introduced into the front arrangement area of the drafting system. A fiber gathering device is arranged in the front arrangement area. The fiber gathering device includes a holding tube. An airflow inlet slit is opened above the holding tube. An airflow outlet slit is opened below the holding tube. A holding net is arranged on the airflow outlet slit. A negative pressure action tube is arranged below the airflow outlet slit. The polyester-viscose drafted fiber bundles pass through the holding tube and are held by the holding net. The negative pressure airflow in the negative pressure action tube acts on the polyester-viscose drafted fiber bundles after passing through the holding net, so that the fibers in the polyester-viscose drafted fiber bundles are gathered to the center, and polyester-viscose drafted sliver is obtained. The polyester-viscose drafted sliver output by the drafting system is twisted to obtain polyester-viscose roving. The polyester-viscose roving includes first polyester-viscose roving and second polyester-viscose roving.

[0014] Step 6: Spinning: the first polyester-viscose roving and the second polyester-viscose roving obtained in step 5 are collectively spun on a spinning machine to obtain the desired fancy yarn.

[0015] The drafting system of the spinning machine adopts a three-roller double-apron structure. An independently driven feeding roller pair is arranged at the rear of the rear roller pair of the drafting system. A feeding groove is opened on the surface of the left side of the feeding lower roller. The first polyester-viscose roving is fed in the feeding groove of the feeding lower roller. The second polyester-viscose roving is pressed and fed between the feeding lower roller and the feeding upper roller. The spinning includes base yarn spinning and slub yarn spinning. In the base yarn spinning, the first polyester-viscose roving is continuously fed and the second polyester-viscose roving is stopped. In the slub yarn spinning, the first polyester-viscose roving and the second polyester-viscose roving are both continuously fed, and the second polyester-viscose roving is subjected to pre-drafting between the feeding roller pair and the rear roller pair.

[0016] The high-efficiency production method of the fancy yarn as described above, wherein preferably, the roving machine adopts an external independent collective doffing form and an automatic doffing device with a double-degree-of-freedom lower apron mechanism.

[0017] The method for efficiently producing fancy yarn as described above, wherein preferably, the cross section of the tension gathering device is elliptical, and the length of the long axis of the cross section of the tension gathering device gradually decreases and the length of the short axis remains unchanged along the direction of the movement of the fiber in the tension gathering device, until the length of the long axis is the same as the length of the short axis.

[0018] The method for efficiently producing fancy yarn as described above, wherein preferably, a fiber embedding slot is provided above the tension gathering device, and the fiber embedding slot is arranged along the length direction of the tension gathering device.

[0019] The method for efficiently producing fancy yarn as described above, wherein preferably, during the drafting process in the main drafting zone of the roving processing, the hook at the rear end of the fiber will be straightened due to the speed difference between the hook and the main body of the fiber caused by the internal friction of the adjacent fiber during the extraction process, and the hook at the front end of the fiber will be straightened due to the speed difference between the hook and the main body of the fiber caused by the internal friction of the adjacent fiber that has not yet changed speed.

[0020] The method for efficiently producing fancy yarn as described above, wherein preferably, the twist factor of the first polyester-viscose roving is between 50 and 70, and the twist factor of the second polyester-viscose roving is between 75 and 90.

[0021] The method for efficiently producing fancy yarn as described above, wherein preferably, the back roller pair of the drafting system of the spinning frame includes a back lower roller and a back top rubber-covered roller, the middle roller pair includes a middle lower roller and a middle top rubber-covered roller, and the front roller pair includes a front lower roller and a front top rubber-covered roller, wherein the back top rubber-covered roller, the middle top rubber-covered roller, and the front top rubber-covered roller are installed on a first pressure assembly, the back lower roller, the middle lower roller, and the front lower roller are respectively installed on the bed surface of the spinning frame through respective roller holders, and the feed roller pair includes a feed lower roller and a feed top rubber-covered roller, wherein the feed lower roller is fixedly connected to the roller holder of the back lower roller through a corresponding roller holder, the feed top rubber-covered roller is installed on a second pressure assembly, the back end of the first pressure assembly and the front end of the second pressure assembly are connected through a rotating shaft, and the rotating shaft is fixed to the bed surface of the spinning frame.

[0022] The high-efficient production method of fancy yarn as described above, wherein, preferably, when the base yarn is spun, the feeding motor controls the stop of the feeding bottom roller, so that the second polyester-viscose roving stops feeding, while the first polyester-viscose roving is normally and continuously fed in the air by the feeding groove of the feeding bottom roller, and then the fed first polyester-viscose roving is pressed between the back bottom roller and the back top roller and enters the drafting system of the ring spinning frame, is drafted by the drafting system, and is output as the base yarn sliver, which is twisted to obtain the base yarn part under the action of the twisting degree of the ring spinning frame.

[0023] The high-efficiency production method of fancy yarn as described above, wherein preferably, when the slubbing is spinning, the feeding motor controls the rotation of the feeding bottom roller to continuously feed the second polyester-viscose roving, and at the same time, the first polyester-viscose roving is continuously fed in the feeding groove of the feeding bottom roller, the second polyester-viscose roving is pressed between the back bottom roller and the back top roller, the linear speed of the feeding bottom roller is less than that of the back bottom roller, so that the second polyester-viscose roving is pre-drafted in the pre-drafting zone between the feeding roller pair and the back roller pair, the linear density ratio of the slub part to the base yarn part is T0, the linear densities of the fed first polyester-viscose roving and the second polyester-viscose roving are T1 and T2 respectively, the required pre-drafting multiple is T2 / ((T0-1)T1), the linear speed of the back bottom roller is v1, and the linear speed of the feeding bottom roller is ((T0-1)T1v1) / T2, under the pre-drafting action, the fibers in the second polyester-viscose roving are further straightened and slip between each other, on the one hand, the linear density of the second polyester-viscose roving is reduced, and on the other hand, the interaction force between the fibers is reduced due to the fiber slippage, so that the twist of the second polyester-viscose roving is reduced, and the second polyester-viscose fiber bundle is obtained, the second polyester-viscose fiber bundle is combined with the continuously output first polyester-viscose roving at the back bottom roller, and the twist factor of the second polyester-viscose fiber bundle is set so that the difference between the residual twist of the second polyester-viscose fiber bundle and the twist of the first polyester-viscose roving is controlled within 5%, the second polyester-viscose fiber bundle and the first polyester-viscose roving then enter the drafting system of the ring spinning frame, under the drafting action of the drafting system, the second polyester-viscose fiber bundle and the first polyester-viscose roving with similar twist and a certain distance are synchronously drafted, under the comprehensive control of the similar internal friction field formed by the similar twist and the same external friction field of the apron, the first drafted slubbing and the second drafted slubbing are obtained, the first drafted slubbing and the second drafted slubbing half output from the drafting system are twisted to obtain the slub part under the action of the twisting degree of the ring spinning frame, and in the twisting process, the transferred sub-twist first twists the first drafted slubbing and the second drafted slubbing into the first slub sub-yarn and the second slub sub-yarn, and the first slub sub-yarn and the second slub sub-yarn are plied into the slub part under the action of the transferred twist.

[0024] Compared with the prior art, the present application realizes the processing of heavy weight roving with heavy weight sliver feeding by adopting the tension gathering device and the fiber gathering device in the drafting system of the roving process; in the spinning process, the strong twisted polyester-viscose blended roving is drafted and untwisted between the feeding roller pair and the back roller pair, then the controlled feeding polyester-viscose blended roving and the continuously fed polyester-viscose blended roving are combined at the back lower roller of the drafting system of the spinning frame, so that the twist is similar, the drafting effect of the slub part is improved, the drafting system composed of the back roller, the middle roller and the front roller is not controlled, the stable production of the fancy yarn with the adjustable slub thickness and length of the slub part under the feeding of the constant weight roving is realized, and the spinning efficiency is greatly improved; the slub part of the present application adopts the siro process with the feeding of two rovings, the strength of the slub part is effectively improved, and the comprehensive quality of the yarn is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the schematic diagram of the whole mechanism of the tension gathering device of the present application.

[0026] Figure 2 It is the schematic diagram of the whole mechanism of the fiber gathering device of the present application.

[0027] The reference signs are explained as follows: 1-tension gathering device, 2-fiber embedding slot, 3-holding tube, 4-air flow inlet slot, 5-air flow outlet slot, 6-holding net, 7-negative pressure acting tube. DETAILED DESCRIPTION

[0028] The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be explained as the limitation of the present application.

[0029] The application provides a high-efficiency production method of fancy yarn, which adopts blending of viscose fiber and polyester fiber to prepare polyester-viscose blended roving, and in the spinning process, two polyester-viscose blended rovings are fed into the feeding roller pair which is controlled together, the feeding roller pair is arranged behind the back roller pair, and the feeding roller pair comprises a feeding bottom roller and a feeding top rubber-covered roller; a feeding groove is formed on the surface of the left side of the feeding bottom roller; one of the polyester-viscose blended rovings is suspendedly fed into the feeding groove of the feeding bottom roller, and the other polyester-viscose blended roving is pressed and fed between the feeding bottom roller and the feeding top rubber-covered roller; the rotation speed of the feeding bottom roller is controlled by the motor to realize the controllable feeding of the pressed polyester-viscose blended roving; the suspendedly and continuously fed polyester-viscose blended roving is drawn by the drawing system of the spinning machine to output the base yarn sliver; the base yarn sliver is twisted to obtain the base yarn part; the controllably fed polyester-viscose blended roving is combined with the continuously fed polyester-viscose blended roving at the back bottom roller of the drawing system of the spinning machine; the two rovings are drawn by the drawing system of the spinning machine to output the slubbing sliver; the slubbing sliver is twisted to obtain the slubbing part; and the thickness and length of the slubbing are adjusted by adjusting the rotation speed of the feeding bottom roller.

[0030] The high-efficiency production method of fancy yarn comprises the following steps:

[0031] The first step is cotton distribution: in order to prevent the fluctuation of fiber whiteness and dyeing performance, single mark raw materials are used for polyester and viscose respectively to avoid yellow and white yarn or cloth surface horizontal bars; meanwhile, in the selection of spinning raw materials, the concept of environmental protection is integrated, and environmentally friendly viscose raw materials are selected to improve the added value of products; in order to save production cost, a small amount of T / R roving and T / R mixed sliver is added in the selection of raw materials.

[0032] The second step is the blowing-carding combination: the selected polyester fibers are sequentially grabbed by the cotton grabber with the bridge-type magnet according to the mixing ratio, and the initial opening and mixing of the polyester fibers are realized in the grabbing process; the block-shaped impurities in the grabbed polyester fibers are separated and removed by the multifunctional separator; the polyester fibers are randomly mixed into different cotton bins and randomly mixed under different conveying paths after leaving the cotton bin by the multi-bin cotton blender with the fan; the opening and impurity removal of the polyester fibers are realized in the conveying process; the further opening and impurity removal of the polyester fibers are realized by the cotton cleaner with the magnetic iron device, so as to prepare the polyester fiber cluster; the polyester fiber cluster enters the carding machine under the driving of the combination of the condensing cotton device, the overhead device and the fan; the polyester fiber cluster is subjected to careful opening, carding, impurity removal and slivering in the carding machine to form the polyester sliver; and the polyester sliver is continuously wound in the sliver can by the sliver winder.

[0033] The selected environment-friendly viscose fibers are sequentially grabbed by the bridge-type magnet grabber according to the mixing ratio, and the initial opening and mixing of the viscose fibers are realized during the grabbing process. The block-shaped impurities in the grabbed viscose fibers are separated and removed by the multifunctional separator. The viscose fibers are randomly mixed into different cotton bins by the multi-bin cotton mixer with a fan, and the random mixing is realized under different transportation paths after recombining out of the cotton bin. The opening and impurity removal of the viscose fibers are realized during the conveying process. The further opening and impurity removal of the viscose fibers are realized by the picking machine with a magnetic iron device, so that the viscose fiber tufts are prepared. The viscose fiber tufts enter the carding machine under the driving of the combination of the condensing cotton device, the overhead device and the fan. The fine opening, carding, impurity removal and slivering are realized in the carding machine, and the sliver-shaped viscose sliver is prepared. The viscose sliver is continuously wound in the sliver can by the sliver winder.

[0034] The process principles of "frequent grabbing, less grabbing, carding instead of beating, and more carding and less shedding" are followed in the opening and picking process, and the process principles of "light weight, low speed, and medium gauge" are followed in the carding process. In the grabbing process, the required raw materials are automatically grabbed by grouping grabbing, and the fine and flexible grabbing is adopted to avoid damage to the fibers. The multifunctional separator includes spark detection and separation and metal detection and separation. The detected sparks and metals are separated and removed by the separation airflow, and the size of the separation airflow can be adjusted. In the multi-bin cotton mixing process, aluminum alloy needle beaters are used, which are light in weight, small in damage to fibers, enhance the holding effect on fibers, and improve the fiber conveying performance. In the picking process, PLC control and industrial touch screen display technology are used for electricity, the needle cylinder adopts variable frequency speed regulation, and the process adjustment is convenient and has strong adaptability. In the carding process, imported Lenz variable frequency motors are used, which have good low-speed stability. The cotton feeder box is designed in an integrated manner with the carding machine, and the overall closed shell is used to reduce the floor area.

[0035] Step 3: Pre-drawing: The polyester sliver prepared in step 2 is drawn and thinned by the drawing system of the pre-drawing device, and then recombined to prepare the polyester pre-drawing with improved evenness. Seven polyester slivers are fed together. The viscose sliver prepared in step 2 is drawn and thinned by the drawing system of the pre-drawing device, and then recombined to prepare the viscose pre-drawing with improved evenness. Seven viscose slivers are fed together.

[0036] The pre-drawing frame is adopted in the pre-drawing process, the drawing system adopts the four-up and four-down attached guide roller pressure bar double-zone curve drawing structure, the motor adopts the variable frequency speed regulation, the process parameters are set through the text display terminal and the programmable controller PLC, the tension between the compression roller and the front roller is adjustable, the 7 polyester slivers or 7 viscose slivers are drawn and thinned through the drawing system in the pre-drawing process, so that the fibers in the sliver are straightened in the drawing process, the fiber straightness of the sliver is improved, the linear density of the polyester pre-drawing sliver or the viscose pre-drawing sliver is controlled and adjusted through the drawing, so that the foundation for realizing the accurate blending ratio control of the polyester fiber and the viscose fiber in the mixed drawing is laid, the random combination between the thick places, the thin places and the normal places in the sliver is realized through the recombination after the drawing, so that the evenness of the polyester pre-drawing sliver or the viscose pre-drawing sliver is improved.

[0037] The fourth step is mixed drawing: the polyester pre-drawing sliver and the viscose pre-drawing sliver prepared in the third step are drawn to prepare the polyester-viscose sliver.

[0038] In the first drawing, a total of 8 polyester pre-drawing slivers and viscose pre-drawing slivers are fed together, the number of the polyester pre-drawing slivers and the viscose pre-drawing slivers is determined according to the required blending ratio of the polyester fiber and the viscose fiber in the blended yarn, the total of 8 polyester pre-drawing slivers and viscose pre-drawing slivers are drawn and thinned by the drawing system of the first drawing frame, and then recombined to prepare the polyester-viscose mixed sliver with improved evenness, so that the required proportion of the polyester fiber and the viscose fiber is mixed.

[0039] In the second drawing, 8 polyester-viscose mixed slivers are fed together, the 8 polyester-viscose mixed slivers are drawn and thinned by the drawing system of the second drawing frame, and then recombined to prepare the polyester-viscose semi-drawing sliver with improved evenness, so that the polyester fiber and the viscose fiber are more uniformly and finely mixed.

[0040] In the third drawing, 8 polyester-viscose semi-drawing slivers are fed together, the 8 polyester-viscose semi-drawing slivers are drawn and thinned by the drawing system of the third drawing frame, and then recombined to prepare the polyester-viscose drawing sliver with improved evenness, so that the polyester fiber and the viscose fiber are more uniformly and finely mixed.

[0041] The fifth step is roving: the polyester-viscose drawing sliver prepared in the fourth step is drawn and thinned by the drawing system of the roving frame, twisted and wound by the twisting system to prepare the polyester-viscose roving with a certain strength and a weight of more than 7g / 10m, an automatic doffing roving frame is selected, the roving frame adopts the automatic doffing device of the external independent collective doffing form and the double-freedom lower dragon muscle mechanism, and realizes the automatic process flow of spinning, doffing, yarn changing and re-spinning.

[0042] The drafting system adopts a four-roller double short apron drafting structure, and includes first polyester-viscose roving production and second polyester-viscose roving production. During production, heavy-draft polyester-viscose slubbing with a draft of 30 g / 5 m or above is fed in. The heavy-draft polyester-viscose slubbing after feeding is first introduced into a rear finishing area of the drafting system. A tension gathering device 1 is arranged in the rear finishing area.

[0043] Referring to Figure 1 As shown in the drawings, the cross section of the tension gathering device 1 is elliptical. Along the movement direction of the fibers in the tension gathering device 1, the length of the major axis of the cross section of the tension gathering device 1 gradually decreases from the rear to the front, and the length of the minor axis remains unchanged until the length of the major axis is the same as the length of the minor axis. A fiber embedding slot 2 is arranged above the tension gathering device 1 along the length direction of the tension gathering device 1. The polyester-viscose slubbing passes through the tension gathering device 1. Under the action of the rear finishing area, a large amount of fibers in the polyester-viscose slubbing are subjected to a certain tension, so that a certain extrusion force is generated between the fibers. At the same time, the fibers are further extruded to the center under the action of the tension gathering device 1, so that a polyester-viscose finished fiber bundle is obtained. The polyester-viscose finished fiber bundle then enters the main drafting area.

[0044] In the main drafting area, the polyester-viscose finished fiber bundle stably moves forward under the combined action of the internal friction field formed by the extrusion force of a large amount of fibers and the external friction field generated by the apron on the fibers. After being separated from the external friction field of the apron, the polyester-viscose finished fiber bundle continues to stably move forward under the control of the internal friction field. When approaching the front jaw of the main drafting area with a high linear speed, part of the fibers change speed, so that a certain number of fibers are extracted as a whole. During the extraction process, the hook at the rear end of the fiber is stretched straight due to the internal friction force of the adjacent fibers. The hook at the front end of the fiber is stretched straight due to the internal friction force of the adjacent fibers which change speed before the fiber changes speed, so that a speed difference is generated between the hook at the front end of the fiber and the main body of the fiber. Thus, the hook at the front end of the fiber is stretched straight, and a polyester-viscose drafted fiber bundle is obtained.

[0045] The polyester-viscose drafted fiber bundle then enters the front finishing area of the drafting system. A fiber gathering device is arranged in the front finishing area. Referring to Figure 2As shown, the fiber gathering device comprises a holding tube 3, the cross section of the holding tube 3 is oval, an airflow inlet slit 4 is opened above the holding tube 3, the airflow inlet slit 4 is arranged along the length direction of the holding tube 3 and penetrates the length direction, an airflow outlet slit 5 is opened below the holding tube 3, the airflow outlet slit 5 is arranged along the length direction of the holding tube 3 and does not penetrate the length direction, a holding net 6 is arranged on the airflow outlet slit 5, a negative pressure acting tube 7 is arranged at the lower part of the airflow outlet slit 5, the polyester-viscose draft fiber bundle passes through the holding tube 3 and is held by the holding net 6, the negative pressure airflow in the negative pressure acting tube 7 acts on the polyester-viscose draft fiber bundle after passing through the holding net 6, so that the fibers in the polyester-viscose draft fiber bundle are gathered to the center, thereby obtaining a polyester-viscose draft sliver, the polyester-viscose draft sliver output by the drafting system is twisted to obtain a polyester-viscose roving, and the first polyester-viscose roving and the second polyester-viscose roving are respectively prepared, the twist factor of the first polyester-viscose roving is less than the twist factor of the second polyester-viscose roving, the twist factor of the first polyester-viscose roving is between 50 and 70, and the twist factor of the second polyester-viscose roving is between 75 and 90.

[0046] The sixth step is to spin the first and second polyester viscose roving into the desired fancy yarn on a modified ring spinning machine. The drafting system of the ring spinning machine has a three-roller double apron structure, with three rows of rollers arranged from back to front as a back roller pair, a middle roller pair, and a front roller pair. The back roller pair includes a back lower roller and a back upper rubber-covered roller, the middle roller pair includes a middle lower roller and a middle upper rubber-covered roller, and the front roller pair includes a front lower roller and a front upper rubber-covered roller. The back upper rubber-covered roller, the middle upper rubber-covered roller, and the front upper rubber-covered roller are installed on a first pressure assembly, and the back lower roller, the middle lower roller, and the front lower roller are installed on the machine bed through their respective roller holders. A feed roller pair is arranged at the back of the back roller pair, including a feed lower roller and a feed upper rubber-covered roller. The feed lower roller is fixedly connected to the back lower roller through a corresponding roller holder, achieving fixed installation of the feed lower roller. The feed upper rubber-covered roller is installed on a second pressure assembly. The back end of the first pressure assembly and the front end of the second pressure assembly are connected through a rotating shaft, which is fixed to the machine bed of the ring spinning machine. A feed groove is opened on the left side of the surface circumference of the feed lower roller, surrounding one circumference of the surface of the feed lower roller. The feed lower roller is driven and controlled by a separate feed motor. During spinning, the first pressure assembly is pressed down, causing the back lower roller and the back upper rubber-covered roller to be in close contact, the middle lower roller and the middle upper rubber-covered roller to be in close contact, and the front lower roller and the front upper rubber-covered roller to be in close contact. The second pressure assembly is pressed down, causing the feed lower roller and the feed upper rubber-covered roller to be in close contact. The first polyester viscose roving is fed through the feed groove of the feed lower roller, and the second polyester viscose roving is fed between the feed lower roller and the feed upper rubber-covered roller. The spinning process includes base yarn spinning and slub spinning. For base yarn spinning, the feed motor stops the feed lower roller from rotating, causing the second polyester viscose roving to stop feeding. The first polyester viscose roving is continuously fed through the feed groove of the feed lower roller. The fed first polyester viscose roving is then pressed between the back lower roller and the back upper rubber-covered roller and enters the drafting system of the ring spinning machine. After being drafted by the drafting system, the base yarn sliver is output and twisted into a base yarn portion under the action of the ring spinning machine's twisting degree.For slubbing, the feeding motor controls the feeding lower roller to rotate, thereby driving the second polyester-viscose roving to be continuously fed, and at this time the first polyester-viscose roving continues to be normally and continuously fed in the air in the feeding groove of the feeding lower roller. The fed second polyester-viscose roving is then pressed between the rear lower roller and the rear top roller. In this process, the linear speed of the feeding lower roller is set to be less than the linear speed of the rear lower roller, thereby making the second polyester-viscose roving be subjected to pre-draft in the pre-draft zone between the feeding roller pair and the rear roller pair. The ratio of the linear density of the slub portion to the base yarn portion is T0, the linear densities of the fed first polyester-viscose roving and the second polyester-viscose roving are T1 and T2 respectively, and the required pre-draft multiple is T2 / ((T0-1)T1). The linear speed of the rear lower roller is v1, and the linear speed of the feeding lower roller is ((T0-1)T1v1) / T2. Under the action of pre-draft, the fibers in the second polyester-viscose roving are further straightened and slip between each other, thereby on the one hand reducing the linear density of the second polyester-viscose roving, and on the other hand reducing the interaction force between the fibers due to the mutual slippage of the fibers, and in turn reducing the twist of the second polyester-viscose roving, thereby obtaining the second polyester-viscose fiber bundle. The second polyester-viscose fiber bundle is combined with the continuously output first polyester-viscose roving at the rear lower roller, and the twist factor of the second polyester-viscose fiber bundle is set so that the difference between the residual twist of the second polyester-viscose fiber bundle and the twist of the first polyester-viscose roving is controlled within 5%. The second polyester-viscose fiber bundle and the first polyester-viscose roving then enter the drafting system of the ring spinning frame together. Under the action of drafting of the drafting system, the second polyester-viscose fiber bundle and the first polyester-viscose roving with similar twist and a certain distance between them are subjected to synchronous drafting. In the drafting process, the second polyester-viscose fiber bundle and the first polyester-viscose roving are subjected to synchronous drafting under the comprehensive control of the internal friction field formed by the similar twist and the same external friction field of the apron, thereby obtaining the first drafted slubbing and the second drafted slubbing respectively. The first drafted slubbing and the second drafted slubbing output from the drafting system are twisted to obtain the slub portion under the action of the twisting degree of the ring spinning frame. In the twisting process, the transferred sub-twist first makes the first drafted slubbing and the second drafted slubbing independently twisted into the first slub sub-yarn and the second slub sub-yarn respectively, and the first slub sub-yarn and the second slub sub-yarn are plied into the slub portion under the action of the transferred twist.

[0047] For example, the prepared slub yarn has a linear density of 16S and a blending ratio of T35 / R65, and the corresponding process parameters are as follows:

[0048] (1) Raw material selection

[0049]

[0050] (2) The process flow is designed as follows

[0051] Viscose: carding and combing → pre-drafting

[0052] PET: blowing-carding unit → pre-drawing

[0053] PET / viscose: first mixing → second mixing → third mixing → roving → spinning

[0054] Viscose / PET: JWF1012 reciprocating picker (with TF27 bridge magnet) → JWF0001 multifunctional separator → JWF1026-120 multi-warehouse mixing machine (with ZF9104 fan) → JWF1124D-120 clearer (with TF34 suction iron device) → FA051A condenser + TF26A overhead device + ZF9104 fan → JWF1204A carding machine + TF2513 lap former → FA320A drawing frame

[0055] Mixing: FA320A drawing frame → FA320A drawing frame → FA320A drawing frame → THC2015 automatic doffer roving frame → DTM129 spinning frame

[0056] (3) Key process parameter design

[0057] Blowing-carding unit: picking

[0058] Raw material Carriage downstroke Carriage speed Grabbing cotton beater speed Beater extended rib distance Polyester 1.5mm 12m / min 1550r / min 1.0mm Viscose 2.0mm 14m / min 1650r / min 1.0mm

[0059] Multi-warehouse mixing

[0060] Raw material Conveyor belt speed Angle nail curtain speed Leveling roller speed Stripping roller speed Polyester 0.60m / min 80.5m / min 730r / min 555r / min Viscose 0.65m / min 83.5m / min 740r / min 560r / min

[0061] Clearing

[0062]

[0063] Carding

[0064]

[0065]

[0066] Pre-drawing and drawing:

[0067]

[0068] Roving:

[0069] First roving

[0070]

[0071] Second roving

[0072]

[0073] Spinning:

[0074] ① Traditional process

[0075] In the spinning process, the conventional process is used to produce viscose sliver with a weight of 19.41 g / 10 m and polyester sliver with a weight of 21.27 g / 10 m, respectively, then the pre-drawing is performed to produce viscose pre-drawing sliver with a weight of 19.67 g / 10 m and polyester pre-drawing sliver with a weight of 21.9 g / 10 m, respectively, then the three-drawing is performed to produce polyester-viscose sliver with a weight of 20 g / 10 m, then the polyester-viscose roving with a weight of 5.44 g / 10 m is produced, and the conventional slub yarn production method is used, that is, the original middle and back roller transmission is changed to separate motor transmission, so that the change of the draft ratio in the front draft zone is realized by the unified speed change of the middle and back rollers, and then the production of slub yarn with different thick and thin effects is realized, and the cycle mode is proportional fuzzy

[0076] Slub parameter setting

[0077]

[0078] Slub thickness D = 2D = T1 / T2 T1 = 2T2

[0079] T1 is the slub linear density, and T2 is the base yarn linear density

[0080] L1 (total length of one cycle of slub) = 716 mm

[0081] L2 (total length of one cycle of base yarn) = 1841 mm

[0082] L (total length of one cycle of yarn) = L1+L2 = 2557 mm (rake width / total length of one cycle = 0.7989)

[0083] Calculation of servo motor and front roller train ratio F when spinning base yarn

[0084] F = ((38*25*35) / (28*1*31)) / draft ratio = 1.82

[0085] Other spinning process parameters are shown in the following table:

[0086]

[0087]

[0088] ②The patent

[0089] Cycle mode: proportional fuzzy

[0090] Slub parameter setting

[0091]

[0092] When the slub portion is produced, the pre-draft ratio between the pair of feed rollers and the pair of back rollers is 1.06, and other spinning process parameters are shown in the following table:

[0093]

[0094] (4) Yarn quality test

[0095]

[0096] The yarn quality test of the slub yarn processed by the present patent and the traditional process is shown in the above table. It can be seen from the test results that compared with the traditional process, the yarn strength-related quality of the present patent is improved. This is because the slub portion of the present patent adopts the siro process of feeding two rovings together, thereby effectively improving the strength of the slub portion and the overall strength of the yarn, and reducing the strength unevenness. At the same time, compared with the traditional process, the set amount of the carding, drawing and roving portions of the present patent is improved, thereby improving the production efficiency of the present patent.

[0097] The above embodiments shown in the drawings explain the structure, features and effects of the present patent in detail. The above description is only the preferred embodiments of the present patent, but the present patent is not limited to the embodiments shown in the drawings. Any changes or modifications made in accordance with the concept of the present patent, or equivalent embodiments with equivalent changes, shall be within the scope of protection of the present patent.

Claims

1. A method of high efficiency production of fancy yarns, characterized by, Comprising the following steps: First step: cotton: polyester and viscose respectively using single mags raw materials, to avoid yellow and white yarn or cloth surface horizontal bar, raw material selection when adding a small amount of T / R roving strip and T / R mixed strip; Second step: carding: the selected polyester, viscose fibers are respectively in turn through the bridge type magnet's picking, multifunctional separator, attached to the fan of multi-bin mixing machine, attached to the cleaner through the condenser + high device + fan combination driven into the carding machine into the polyester carded sliver, viscose carded sliver; Third step: pre-drawing: the polyester sliver and viscose sliver prepared in the second step are drawn and thinned by the drafting system of pre-drawing, and then recombined to obtain polyester pre-drawing and viscose pre-drawing with improved evenness; Fourth step: mixed drawing: the polyester pre-drawing and viscose pre-drawing prepared in the third step are drawn by three-drawing to obtain heavy weight polyester-viscose sliver; Fifth step: roving: the heavy weight polyester-viscose sliver prepared in the fourth step is thinned and twisted by the drafting system of the roving machine and the twisting system to obtain polyester-viscose roving with a certain strength and a weight of more than 7g / 10m; The drafting system adopts a four-roller double-short apron drafting structure, and the heavy weight polyester-viscose sliver with a weight of more than 30g / 5m is fed in. The heavy weight polyester-viscose sliver after feeding first enters the rear finishing area of the drafting system. A tension gathering device is arranged in the rear finishing area. Under the action of the rear finishing area, a large amount of fibers in the heavy weight polyester-viscose sliver are subjected to a certain tension, so that a certain extrusion force is generated between the fibers. Meanwhile, the fibers are further extruded to the center under the action of the tension gathering device, so that a polyester-viscose finishing fiber bundle is obtained. The polyester-viscose finishing fiber bundle then enters the main drafting area. In the main drafting area, the polyester-viscose finishing fiber bundle is stably moved forward under the combined action of the internal friction field generated by the extrusion force of a large amount of fibers and the external friction field generated by the apron on the fibers. When the polyester-viscose finishing fiber bundle is close to the front jaw of the main drafting area, a part of the fibers are extracted from the whole due to the change of speed, so that a polyester-viscose drafting fiber bundle is obtained. The polyester-viscose drafting fiber bundle then enters the front finishing area of the drafting system. A fiber gathering device is arranged in the front finishing area. The fiber gathering device includes a holding tube. An airflow inlet slit is opened above the holding tube. An airflow outlet slit is opened below the holding tube. A holding net is arranged on the airflow outlet slit. A negative pressure action tube is arranged below the airflow outlet slit. The polyester-viscose drafting fiber bundle passes through the holding tube and is held by the holding net. The negative pressure airflow in the negative pressure action tube acts on the polyester-viscose drafting fiber bundle through the holding net, so that the fibers in the polyester-viscose drafting fiber bundle are gathered to the center, and a polyester-viscose fiber drafting sliver is obtained. The polyester-viscose fiber drafting sliver output by the drafting system is twisted to obtain polyester-viscose roving. The polyester-viscose roving includes first polyester-viscose roving and second polyester-viscose roving; Sixth step: spinning: the first polyester-viscose roving and the second polyester-viscose roving prepared in the fifth step are collectively spun by a spinning machine to obtain the required fancy yarn. The drafting system of the spinning frame adopts a three roller and double apron structure, an independently driven feed roller pair is arranged at the rear of the back roller pair of the drafting system, a feed groove is opened on the surface of the left side of the feed bottom roller of the feed roller pair, the first polyester viscose roving is suspendedly fed through the feed groove of the feed bottom roller, the second polyester viscose roving is pressed and fed between the feed bottom roller and the feed top roller, fancy yarn spinning includes base yarn spinning and slub yarn spinning, the first polyester viscose roving is continuously fed and the second polyester viscose roving is stopped feeding during base yarn spinning, the first polyester viscose roving and the second polyester viscose roving are both continuously fed during slub yarn spinning, and the second polyester viscose roving is subjected to pre-drafting between the feed roller pair and the back roller pair at this time.

2. A method of efficient production of fancy yarn as claimed in claim 1 wherein: The roving frame adopts an external independent collective doffing form and an automatic doffing device with a double-degree-of-freedom lower dragon muscle mechanism.

3. A method of efficient production of fancy yarn as claimed in claim 1, wherein: The cross section of the tension gathering device is elliptical, and along the movement direction of the fiber in the tension gathering device, the length of the major axis of the cross section of the tension gathering device gradually decreases from the rear to the front, and the length of the minor axis remains unchanged until the length of the major axis is the same as the length of the minor axis.

4. A method of efficiently producing fancy yarns as claimed in claim 1, wherein: A fiber embedding slot is opened above the tension gathering device and is arranged along the length direction of the tension gathering device.

5. A method of efficiently producing fancy yarns as claimed in claim 1, wherein During the drafting process of the main drafting zone of the roving processing, during the extraction process, the hook at the rear end of the fiber is subjected to the internal friction force of the adjacent fiber, thereby a speed difference is generated between the hook at the rear end of the fiber and the main body of the fiber, the hook at the rear end is straightened, the hook at the front end of the fiber is subjected to the internal friction force of the adjacent fiber which is subjected to speed change before the fiber is subjected to speed change, a speed difference is generated between the hook at the front end of the fiber and the main body of the fiber, and the hook at the front end is straightened.

6. A method of efficiently producing fancy yarns as claimed in claim 1, wherein: The twist factor of the first polyester viscose roving is between 50 and 70, and the twist factor of the second polyester viscose roving is between 75 and 90.

7. A method of efficiently producing fancy yarns as claimed in claim 1, wherein: The back roller pair of the drafting system of the spinning frame includes a back bottom roller and a back top roller, the middle roller pair includes a middle bottom roller and a middle top roller, and the front roller pair includes a front bottom roller and a front top roller, wherein the back top roller, the middle top roller and the front top roller are installed on a first pressing assembly, the back bottom roller, the middle bottom roller and the front bottom roller are respectively installed on the machine bed through respective roller holders, the feed roller pair includes a feed bottom roller and a feed top roller, wherein the feed bottom roller is fixedly connected with the roller holder of the back bottom roller through a corresponding roller holder, the feed top roller is installed on a second pressing assembly, the rear end of the first pressing assembly and the front end of the second pressing assembly are connected through a rotating shaft, and the rotating shaft is fixed on the machine bed of the spinning frame.

8. A method of efficiently producing fancy yarns as claimed in claim 1, characterized in that: During base yarn spinning, the feed motor controls the feed bottom roller to stop rotating, so that the second polyester viscose roving is stopped feeding, and the first polyester viscose roving is normally and continuously fed in the feed groove of the feed bottom roller, the fed first polyester viscose roving is then pressed between the back bottom roller and the back top roller and enters the drafting system of the ring spinning frame, and the output base yarn sliver is twisted to obtain the base yarn part under the action of the twisting degree of the ring spinning frame.

9. A method of efficiently producing fancy yarns as claimed in claim 1, wherein: The slub yarn is spun, the feeding motor controls the rotation of the feeding lower roller, the second polyester viscose roving is continuously fed, and at this time the first polyester viscose roving is normally and continuously fed in the air in the feeding groove of the feeding lower roller, the second polyester viscose roving is pressed between the rear lower roller and the rear upper rubber-covered roller, the linear speed of the feeding lower roller is less than that of the rear lower roller in this process, the second polyester viscose roving is subjected to pre-draft in the pre-draft zone between the feeding roller pair and the rear roller pair, the linear density ratio of the slub part to the base yarn part is T0, the linear densities of the fed first polyester viscose roving and the second polyester viscose roving are T1 and T2 respectively, and the required pre-draft multiple is T2 / ((T0-1)T1), the linear speed of the feeding lower roller is ((T0-1)T1v1) / T2, the fibers in the second polyester viscose roving are further straightened and subjected to mutual slipping under the action of pre-draft, on the one hand the linear density of the second polyester viscose roving is reduced, and on the other hand the interaction force between the fibers is reduced due to the mutual slipping of the fibers, so that the twist of the second polyester viscose roving is reduced, the second polyester viscose fiber bundle is obtained, the second polyester viscose fiber bundle is combined with the continuously output first polyester viscose roving at the rear lower roller, and the twist factor of the second polyester viscose fiber bundle is set so that the difference between the residual twist of the second polyester viscose fiber bundle and the twist of the first polyester viscose roving is controlled within 5% at this time, the second polyester viscose fiber bundle and the first polyester viscose roving then enter the drafting system of the ring spinning frame, the second polyester viscose fiber bundle and the first polyester viscose roving are subjected to synchronous drafting at a certain distance under the action of the drafting system, the first drafted slub yarn and the second drafted slub yarn are obtained under the synchronous drafting of the second polyester viscose fiber bundle and the first polyester viscose roving under the comprehensive control of the internal friction field formed by the similar twist and the same friction field of the apron, the first drafted slub yarn and the second drafted slub yarn are twisted to form the slub part under the action of the twist of the ring spinning frame, the sub-twist transferred first twists the first drafted slub yarn and the second drafted slub yarn into the first slub sub-yarn and the second slub sub-yarn respectively, and the first slub sub-yarn and the second slub sub-yarn are plying into the slub part under the action of the transferred twist.

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