A process for producing a vortex spun yarn of a blend of rayon and viscose

Abstract

The application provides a production process of a vortex spinning lyocell-viscose blended thick yarn, and belongs to the technical field of vortex spinning.The application takes lyocell fibers and viscose fibers as raw materials, and performs carding, doubling drafting, drafting wrapping, winding, joint processing and specific control conditions, so that a 6-16S lyocell-viscose blended thick yarn with high evenness (subsequent yarn dyeing is uniform, and strength is uniform), good joint breaking strength and good joint strength ratio (tends to 100%, close to normal yarn) is obtained, so as to meet actual requirements.

Description

Technical Field

[0001] This invention relates to a production process for coarse yarns, and more particularly to a production process for vortex-spun lyoviscose blended coarse yarns, belonging to the field of vortex spinning technology. Background Technology

[0002] Vortex spinning is a novel spinning method that utilizes a stationary vortex spinning tube instead of a high-speed rotating spinning cup for spinning. During vortex spinning, fiber cohesion, transfer, twisting, and yarn formation are all accomplished with the aid of airflow. The advantages of this spinning method include: 1. The vortex spinning machine has a simple structure and eliminates high-speed rotating components, thus enabling high-speed spinning; 2. Due to the use of airflow for twisting, it avoids the rotational inertia and bearing load problems caused by high-speed twisting components; 3. The yarn has a stiff outer layer and a soft inner layer; 4. The yarn's structural characteristics are mainly reflected in its dual structure: the core fibers are arranged in parallel and have no twist, while the end fibers wrap around and twist with the core fibers under the action of rotating airflow to form the yarn; 5. The yarn has good evenness and low hairiness, making it suitable for producing anti-pilling fiber products. Currently, vortex spinning has a wide range of applications and can produce fiber products of various shapes, sizes, and materials, such as blended and synthetic fibers.

[0003] Currently, yarn is classified by count as follows: coarse yarn (below 18 count, i.e., below 18S); medium yarn (19-28 count, i.e., 19-28S); fine yarn (29-54 count, i.e., 29-54S); and extra-fine yarn (above 58 count, i.e., below 58S). Due to limitations in vortex spinning and yarn forming processes, yarns with a fineness of 10-60S can generally be produced. Furthermore, the coarse yarns produced (below 18S) have poor splice strength, which is detrimental to subsequent production. In addition, the blended coarse yarns produced suffer from uneven mixing of multiple components and poor accuracy in blending ratios, making it impossible to guarantee the dyeing effect and strength performance of subsequent products, thus seriously affecting the quality of subsequent products.

[0004] Although the prior art CN113373565A discloses "a method for producing vortex-spun polyester coarse yarn", which blends poly(butylene terephthalate) staple fiber and polyester staple fiber to produce vortex-spun polyester coarse yarn with a count of 7-12S, it mainly solves the problem of weak twisting in the yarn, but does not solve the problems of uneven mixing of multiple components, poor accuracy of blending ratio, and poor splice strength in blended coarse yarn. Similarly, CN112125060A discloses "a splicing carriage with a single-spindle suction nozzle and its splicing method", which addresses the problem of long distance between the small suction nozzle and the negative pressure tube in the prior art, which easily leads to yarn wrapping and yarn blockage, but does not solve the problem of poor splice strength in the production of coarse yarn.

[0005] Therefore, a production process for blended coarse yarns with high accuracy in blending ratio, high blending uniformity, and high splice strength is needed. Summary of the Invention

[0006] This invention aims to solve the problems of unevenness, poor blending ratio accuracy, and poor joint strength in the existing technology of vortex spinning blended coarse yarn, and proposes a production process for vortex spinning lye-viscose blended coarse yarn.

[0007] Specifically, by specially setting process parameters such as the carding process quantity, cylinder speed, flats speed, and sliver output speed, the straightness, parallelism, and separation of the cotton sliver fibers are adjusted to solve the problem of unevenness in blended coarse yarns. By adjusting the drawing process, the quantity of Lyocell and viscose slivers is precisely controlled to ensure that the difference between the actual weight and the design weight of the sliver is less than ±0.5g / 5m, thus solving the problem of poor blending accuracy. In addition, by adjusting the starting rate of the back roller of the splicing machine, untwisting pressure, auxiliary untwisting pressure, twisting pressure, small suction nozzle negative pressure, small suction nozzle auxiliary untwisting pressure, yarn untwisting time, yarn untwisting time, twisting time, Ln rod position, and upper untwisting tube position, the problem of low splice strength ratio is solved. This approach is well adapted to Lyocell and viscose fiber raw materials, ultimately resulting in a high-performance vortex-spun Lyocell / Viscose blended coarse yarn. On the other hand, it ensures the stability and sustainability of the vortex-spun Lyocell / Viscose blended coarse yarn preparation process.

[0008] To achieve the above technical objectives, the following technical solution is proposed:

[0009] A process for producing coarse-count eddy coarse yarn using vortex spinning of lyoviscose blend includes the following steps:

[0010] S1 carding: Using Lyocell fiber and viscose fiber as raw materials, the Lyocell fiber is carded to form Lyocell slivers with a weight of 4.5-7.5g / m, and the viscose fiber is carded to form viscose slivers with a weight of 4.5-7.5g / m.

[0011] The fineness of lyocell fiber is 1.0-1.67 dtex, and the length is 30-50 mm; the fineness of viscose fiber is 1.0-1.67 dtex, and the length is 30-50 mm.

[0012] In the formation of lyocell slivers, the cylinder speed is 380-420 m / min, the flats speed is 150-200 m / min, and the sliver exit speed is 120-160 m / min; in the formation of viscose slivers, the cylinder speed is 400-440 m / min, the flats speed is 120-180 m / min, and the sliver exit speed is 140-180 m / min.

[0013] S2 doubling and drafting: The Lyocell sliver and viscose sliver obtained in step S1 are doubled and arranged according to the blending ratio, and then three doubling and three drafting are performed to form a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m.

[0014] The blending ratio refers to the weight ratio of Lyocell slivers to viscose slivers being 10-90:10-90; the total number of slivers combined is 5-8, and the draw ratio is 5.0-8.5.

[0015] S3 Drafting and wrapping: The rayon-viscose blended sliver obtained in step S2 is fed into a vortex spinning machine for drafting and wrapping to form the initial product of rayon-viscose blended coarse yarn.

[0016] The draft ratio is 60-165 times, and the spinning speed is 400-480 m / min. The vortex spinning machine is a Murata 870EX model, using internal components—spindle model C1 (provided by Murata Corporation). In this process, selecting a reasonable draft ratio ensures that the sliver is drawn and thinned evenly, improving yarn dryness, hairiness, and yarn defects. Selecting a reasonable spinning speed can improve yarn breaking strength, enhance the wrapping effect of yarn around fibers, and reduce yarn breakage and hollow spindle blockage problems.

[0017] S4 winding: Using friction rollers, the initial product of the rayon-viscose blended coarse yarn obtained in step S3 is wound into shape to obtain rayon-viscose blended coarse yarn with a count of 6-16S.

[0018] The thickness of the gasket for the friction roller is 4.5-6.8mm, and the tension of the initial product of the rayon-viscose blended coarse yarn is 170-200mN.

[0019] The production process also includes splicing treatment of the lycopene-viscose blended coarse-count yarn, specifically including:

[0020] The splicing carriage operates with the large suction nozzle finding the starting point and the small suction nozzle generating the starting point. After untwisting and twisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. A V-type splicer is used, with a back roller starting rate of 40-80%, untwisting pressure of 0.70-0.90 MPa, auxiliary untwisting pressure of 0.20-0.80 MPa, twisting pressure of 0.70-0.90 MPa, small suction nozzle negative pressure of 0.50-0.70 MPa, small suction nozzle auxiliary untwisting pressure of 0.50-0.60 MPa, yarn untwisting time of 0.55-0.65 s, yarn untwisting time of 0.45-0.55 s, twisting time of 0.40-0.45 s, Ln rod position of -4 to -1, and upper untwisting tube position of -3.

[0021] In this technical solution, the lyocell index, viscose fiber index, and lyocell-viscose yarn product index, such as count, are tested using conventional methods. The blending ratio test standard is "FZ / T 01101-2008 Determination of Fiber Content in Textiles - Physical Method".

[0022] The beneficial technical effects of adopting this technical solution are as follows:

[0023] 1) This invention uses lyocell fiber and viscose fiber as raw materials and adopts a specific spinning process to obtain a 6-16S lyocell-viscose blended coarse yarn with high uniformity (uniform dyeing and strength of subsequent yarns), good splice breaking strength and good splice strength ratio (approaching 100%, close to normal yarn), thus effectively ensuring the performance and quality of the lyocell-viscose blended coarse yarn.

[0024] 2) In this invention, the fineness of the raw materials, lyocell fiber and viscose fiber, is 1.0-1.67 dtex. During the vortex spinning process, effective rotation and twisting are formed to avoid the generation of weak loops, thereby solving the problem that vortex-spun composite coarse yarn is prone to weak twisting and low yarn quality. Attached Figure Description

[0025] Figure 1 This is a scanning electron microscope image of the eddy current spun lyoviscose blended coarse yarn obtained in Example 1 of this invention;

[0026] Figure 2 This is the test report (I) of the vortex-spun lyoviscose blended coarse yarn obtained in Example 1 of the present invention.

[0027] Figure 3 This is the second test report on the eddy current spun lyoviscose blended coarse yarn obtained in Example 1 of this invention.

[0028] Figure 4 This is a diagram of the spindle structure used in this invention;

[0029] Figure 5 This is a diagram showing the appearance of the splice of a 6-count eddy spun lyoviscose blended coarse yarn obtained in Example 8 of this invention.

[0030] Figure 6 This is a splice appearance diagram of 10-count eddy spun lyoviscose blended coarse yarn obtained in Example 9 of the present invention.

[0031] Figure 7 This is a splice appearance diagram of a 16-count eddy spun lyoviscose blended coarse yarn obtained in Example 10 of the present invention.

[0032] Figure 8 This is a process flow diagram of vortex spinning of lyoviscose blended coarse yarn in this invention. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] In the existing preparation of coarse yarns using vortex spinning, within a certain linear density range, the breaking strength of air-jet vortex-spun yarn decreases with increasing linear density; thicker yarns exhibit lower breaking strength, which is the opposite of the pattern observed in ring spinning. Furthermore, when producing coarse yarns, adjusting the draft ratio to a certain low level can lead to problems such as poor yarn quality, high yarn breakage rate, hollow spindle blockage, and uneven single-yarn strength, and may even result in the inability to form yarn at all.

[0035] For jet-jet vortex-spun yarn, it consists of two parts: core fibers and wrapping fibers. After being drafted by rollers, the fiber bundle is drawn into the nozzle. The fibers at the head end form the core fibers, while the fibers at the tail end, freed from the constraints of the front rollers, lie flat on the outer wall of the hollow spindle and wrap around the core fibers in the direction of airflow rotation to form jet-jet vortex yarn. The core fibers, composed of multiple fibers, determine the linear density of the yarn, while the degree of wrapping of the core fibers by the outer wrapping fibers determines the breaking strength of the yarn. Compared to medium and fine spun yarns, coarse spun yarns have a significantly increased number of core fibers, increasing the difficulty of wrapping and leading to difficulties in yarn formation. Furthermore, since the raw fiber length is the same, the higher the yarn linear density and the larger the yarn diameter, the fewer the wrapping fibers wrap around the core fibers, resulting in poorer single-yarn breaking strength.

[0036] After the fiber head enters the hollow spindle to form the core fiber, the tail fiber disperses and lies flat on the outer wall of the hollow spindle under the action of airflow. The coarse yarn has a large number of fibers, making it difficult to achieve the same dispersion effect as medium and fine yarns. The wrapped fibers that are not fully dispersed overlap, resulting in large segments of core fiber being repeatedly wrapped and large segments of core fiber being exposed. The excessive wrapping of the core fiber by the overlapping wrapping part will also squeeze the core fiber, causing the core fiber to bend outwards towards the yarn. Uneven wrapping and local over-wrapping can lead to yarn breakage and hollow spindle blockage during the spinning process.

[0037] Based on the aforementioned issues and current production status of vortex-spun coarse yarns, this invention addresses the problems of unevenness, poor blending ratio accuracy, and weak splice strength in existing vortex-spun blended coarse yarns. It proposes a production process for vortex-spun lyocell / viscose blended coarse yarns, using lyocell and viscose fibers as raw materials. However, since lyocell / viscose yarn is a blended coarse yarn, meaning it uses two fibers with different properties, controlling the blending ratio during production is challenging. According to the industry standard "FZT 12065-2020 Lyocell and Viscose Fiber Blended Natural Yarn," the blending ratio deviation needs to be controlled within ±1.5%, placing high demands on the quantitative design and quality control of the pre-spun sliver.

[0038] Furthermore, the raw material lyocell fiber is rigid, has low elongation, and poor cohesion; viscose fiber has low strength and even lower wet strength, only half of its dry strength. When blending these two fiber raw materials, the spinning performance of both fibers must be comprehensively considered, and the process parameters for pre-spinning and vortex spinning must be designed accordingly. For the final product—a lyocell / viscose blended coarse yarn of 6-16 count—the yarn count is relatively low. According to the yarn formation mechanism of vortex spinning, the coarser the yarn, the more pronounced the problems of poor yarn quality, high yarn breakage rate, hollow spindle blockage, and uneven single yarn strength become, even leading to the inability to form yarn. For the splicing of coarse lyocell / viscose yarn, the significant increase in fiber quantity during untwisting and twisting increases the difficulty of wrapping, leading to difficulties in yarn formation. The difficulty of untwisting the yarn tail into loose fibers and then twisting the tail end together to form yarn is considerable. Therefore, this invention is illustrated through the following embodiments.

[0039] Example 1

[0040] This embodiment provides a production process for vortex-spun lyoviscose blended coarse-count yarn, such as... Figure 7 As shown, it includes the following steps:

[0041] S1 carding: Using Lyocell fiber and viscose fiber as raw materials, the Lyocell fiber is carded to form Lyocell slivers with a weight of 4.5-7.5g / m, and the viscose fiber is carded to form viscose slivers with a weight of 4.5-7.5g / m.

[0042] Among these measures, the difference between the actual weight and the design weight of the corresponding tampons must be controlled to be less than ±0.5g / m, and the CV% of the tampons must be controlled to be within 5%.

[0043] Lyocell fiber has a fineness of 1.0-1.67 dtex and a length of 30-50 mm; viscose fiber has a fineness of 1.0-1.67 dtex and a length of 30-50 mm.

[0044] S2 Doubling and Drafting: The Lyocell and viscose slivers obtained in step S1 are combined and arranged according to the blending ratio. Then, three doubling and three drafting processes are performed to form a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m. The difference between the actual weight and the design weight of the sliver is controlled to be less than ±0.5 g / m, and the evenness CV% is controlled to be within 5%.

[0045] S3 Drafting and Wrapping: The rayon-viscose blended sliver obtained in step S2 is fed into a vortex spinning machine for drafting and wrapping. A Z-type twister is used to form the initial product of rayon-viscose blended coarse yarn.

[0046] S4 Winding: Using friction rollers, the initial product of the rayon-viscose blended coarse yarn obtained in step S3 is wound into shape, thus obtaining a rayon-viscose blended coarse yarn with a count of 6-16S (e.g., ...). Figure 1-3 (As shown).

[0047] For 6-16S rayon-viscose blended coarse yarns, according to the yarn formation mechanism of vortex spinning, lower yarn counts (coarser yarn body) result in uneven distribution of wrapped fibers, with large areas of core fibers exposed on the yarn surface. This leads to severe overlap and entanglement of the wrapped fibers, causing disordered wrapping. During spinning, this easily causes nozzle clogging, frequent yarn breaks, and difficulty in splicing. Consequently, problems such as poor yarn quality, high yarn breakage rate, hollow spindle clogging, and uneven single yarn strength become more pronounced, sometimes even preventing yarn formation altogether. To address these issues, the main solution is to improve the fiber straightness, parallelism, and separation of the sliver. Specifically, this is achieved by adopting appropriate process parameters (e.g., adjusting the weight of the carding process, cylinder, flats, and sliver exit speed) to solve the difficulties in forming coarse yarns.

[0048] In addition, for vortex-spun lyoviscose blended coarse yarns, some test data for the corresponding yarn count are provided, as shown in Table 1 below.

[0049] Table 1

[0050]

[0051] Example 2

[0052] In the production of rayon-viscose blended coarse-count yarns, yarn breakage is directly related to the frictional and air resistance experienced by the fiber sliver. If the resistance exceeds the strength that the fiber sliver can withstand, yarn breakage will occur. Yarn breakage not only affects the yield and quality of the face yarn but also the quality and appearance of the fabric. Therefore, based on Example 1, this example proposes a splicing treatment for rayon-viscose blended coarse-count yarns, specifically including:

[0053] The splicing carriage operates with the large suction nozzle finding the starting point and the small suction nozzle generating the starting point. After untwisting and twisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. The splicer is a V-type splicer with a back roller starting rate of 40-80%, an untwisting pressure of 0.70-0.90 MPa, an auxiliary untwisting pressure of 0.20-0.80 MPa, a twisting pressure of 0.70-0.90 MPa, a small suction nozzle negative pressure of 0.50-0.70 MPa, a small suction nozzle auxiliary untwisting pressure of 0.50-0.60 MPa, an untwisting time of 0.55-0.65 s for the yarn being fed, an untwisting time of 0.45-0.55 s for the yarn being untwisted, a twisting time of 0.40-0.45 s, a Ln rod position of -4 to -1, and an upper untwisting tube position of -3. The splicing carriage used is model 87C EX.

[0054] By setting the control parameters in this embodiment, the problem of poor splice strength in blended coarse yarns is effectively solved, and the splice strength ratio of blended coarse yarns after splicing tends to be 100%, similar to normal yarns.

[0055] The cross-sectional area of ​​standard yarns contains approximately 110-150 fibers, while coarse-count yarns contain approximately 260-710 fibers, representing an increase of about 130%-370%. A higher fiber count in the yarn cross-section requires more fibers to be wrapped during untwisting and retwisting. By using Z-type or V-type splicers and adjusting the aforementioned process parameters, the untwisting and retwisting effect can be improved, resulting in a qualified splice.

[0056] Example 3

[0057] In this embodiment, lyocell fiber is used as raw material. A carding machine is used with the cylinder speed set to 380-420 m / min, the flats speed set to 150-200 m / min, and the sliver output speed set to 120-160 m / min. The lyocell fiber is carded to form a lyocell sliver with a weight of 4.5-7.5 g / m.

[0058] The settings for cylinder speed, flats speed, and sliver output speed in the carding machine ensure, on the one hand, that they are well-matched with the Lyocell fiber raw material, and on the other hand, that the Lyocell sliver preparation process proceeds smoothly, orderly, and stably.

[0059] Example 4

[0060] In this embodiment, viscose fiber is used as raw material. A carding machine is used with the cylinder speed set to 400-440m / min, the flats speed set to 120-180m / min, and the sliver output speed set to 140-180m / min. The viscose fiber is carded to form a viscose sliver with a weight of 4.5-7.5g / m.

[0061] The settings for cylinder speed, flats speed, and sliver output speed in the carding machine ensure, on the one hand, that they can be well adapted to viscose fiber raw materials, and on the other hand, that the viscose sliver preparation process can proceed smoothly, orderly, and stably.

[0062] Example 5

[0063] In this embodiment, in order to form a Lyocell / Viscose blended sliver with a weight of 5.5-7.0 g / m, the blending ratio of Lyocell sliver to viscose sliver is 10-90:10-90, the total number of slivers is 5-8, and the draw ratio is 5.0-8.5 times.

[0064] The blending ratio refers to the weight ratio of lyocell slivers to viscose slivers. For the blending ratio and the number of strands combined, for example, if the blending ratio of lyocell slivers to viscose slivers is 60:40, then there are 3 lyocell slivers and 2 viscose slivers; or, if the blending ratio is 80:20, then there are 4 lyocell slivers and 1 viscose sliver, and so on. These can be further specified based on the required yarn specifications.

[0065] Example 6

[0066] In this embodiment, the vortex spinning machine used in the preparation process of the initial product of the rayon-viscose blended coarse yarn is a Murata 870EX, wherein the internal component - the spindle - is model C1 (provided by Murata Corporation), and the structure of the spindle is as follows. Figure 4 As shown.

[0067] Furthermore, the following controls are implemented: the draft ratio is 60-165 times, and the spinning speed is 400-480 m / min. By selecting a reasonable draft ratio, it is possible to ensure that the sliver is drawn out evenly and thinned, thereby improving indicators such as yarn dryness, hairiness, and yarn defects; by selecting a reasonable spinning speed, the breaking strength of the yarn can be improved, the wrapping effect of the yarn around the fibers can be enhanced, and the problems of yarn breakage and hollow spindle blockage can be reduced.

[0068] Example 7

[0069] In this embodiment, the initial product of rayon-viscose blended coarse yarn is wound and formed using friction rollers. The thickness of the pad of the friction roller is 4.5-6.8mm, and the tension of the initial product of rayon-viscose blended coarse yarn is 170-200mN, resulting in rayon-viscose blended coarse yarn with a count of 6-16S.

[0070] Among them, the thickness and tension settings of the pads for the rubbing rollers are designed to ensure good compatibility with the initial product of the rayon-viscose blended coarse yarn, resulting in a yarn count as low as 6S. On the other hand, they ensure the smooth, orderly, and stable operation of the initial product forming process of the rayon-viscose blended coarse yarn.

[0071] Example 8

[0072] This embodiment provides a production process for vortex-spun lyocell / viscose blended coarse yarn. The resulting vortex-spun lyocell / viscose blended coarse yarn is a double-structured coarse yarn. The core fibers of the coarse yarn are arranged in parallel and are untwisted. The outer layer of the core fibers consists of twisted end fibers that are wrapped and wrapped by airflow. The raw materials used, lyocell fibers, have a fineness of 1.33 dtex and a length of 38 mm. The raw materials, viscose fibers, also have a fineness of 1.33 dtex and a length of 38 mm.

[0073] The production process of the above-mentioned vortex-spun lyoviscose blended coarse yarn includes the following steps:

[0074] (1) First, the Lyocell fiber and the viscose fiber are combed into strips to form Lyocell strips with a weight of 7.2g / m and viscose strips with a weight of 7.2g / m respectively;

[0075] Among them, the cylinder speed for producing Lyocell swabs is 420m / min, the flats speed is 180m / min, and the swab output speed is 120m / min; the cylinder speed for producing viscose swabs is 420m / min, the flats speed is 150m / min, and the swab output speed is 180m / min.

[0076] (2) Combining and drafting: The Lyocell sliver and viscose sliver obtained in step (1) are combined and arranged according to the required blending ratio of the yarn (60 / 40), and then, after three drawing and three drafting processes, a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m is formed.

[0077] Among them, the number of slivers combined in the first process is 5, the number of Lyocell slivers is 3, the number of viscose slivers is 2, and the draw ratio is 5.14.

[0078] (3) The rayon-viscose blended sliver obtained in step (2) is fed into the bell mouth of the vortex spinning feeder. The rayon-viscose blended fiber sliver is simultaneously drawn into a sliver by four rollers and output into the nozzle from the front roller. It moves at high speed along the spiral surface at the nozzle inlet. Under the action of compressed air, it passes through the nozzle and the hollow spindle and is twisted into yarn by vortex spinning. The draw ratio is 61 times.

[0079] (4) The initial yarn is wound into shape by friction rollers to obtain vortex spun lye-viscose blended coarse yarn. The friction roller pad is 6.8 mm, the spinning tension is 200 mN, and the yarn count is 6.

[0080] In addition, after a breakage occurs during the production of the rayon-viscose blended yarn, the splicing carriage operates, with the large suction nozzle finding the breakage point and the small suction nozzle generating the breakage point. After untwisting and retwisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. The splicer is a V-type splicer with a back roller initiation rate of 40%, untwisting pressure of 0.90 MPa, auxiliary untwisting pressure of 0.80 MPa, retwisting pressure of 0.90 MPa, small suction nozzle negative pressure of 0.70 MPa, small suction nozzle auxiliary untwisting pressure of 0.60 MPa, yarn untwisting time of 0.65 s, yarn untwisting time of 0.55 s, retwisting time of 0.45 s, Ln rod position of -1, and upper untwisting tube position of -3 mils. The appearance of the joint is as follows: Figure 5 As shown.

[0081] Example 9

[0082] This embodiment provides a production process for vortex-spun lyocell / viscose blended coarse yarn. The resulting vortex-spun lyocell / viscose blended coarse yarn is a double-structured coarse yarn. The core fibers of the coarse yarn are arranged in parallel and are untwisted. The outer layer of the core fibers consists of twisted end fibers that are wrapped and wrapped by airflow. The raw materials used, lyocell fibers, have a fineness of 1.33 dtex and a length of 38 mm. The raw materials, viscose fibers, also have a fineness of 1.33 dtex and a length of 38 mm.

[0083] The production process of the above-mentioned vortex-spun lyoviscose blended coarse yarn includes the following steps:

[0084] (1) First, the Lyocell fiber and the viscose fiber are combed into strips to form Lyocell strips with a weight of 7.2g / m and viscose strips with a weight of 7.2g / m respectively;

[0085] Among them, the cylinder speed for producing Lyocell swabs is 420m / min, the flats speed is 180m / min, and the swab output speed is 120m / min; the cylinder speed for producing viscose swabs is 420m / min, the flats speed is 150m / min, and the swab output speed is 180m / min.

[0086] (2) Combining and drafting: The Lyocell sliver and viscose sliver obtained in step (1) are combined and arranged according to the required blending ratio of the yarn (60 / 40), and then, after three rounds of drawing and drafting, a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m is formed.

[0087] Among them, the number of slivers combined in the first process is 5, the number of Lyocell slivers is 3, the number of viscose slivers is 2, and the draw ratio is 5.14.

[0088] (3) The rayon-viscose blended sliver obtained in step (2) is fed into the bell mouth of the vortex spinning feeder. The rayon-viscose blended fiber sliver is simultaneously drawn into a sliver by four rollers and output into the nozzle from the front roller. It moves at high speed along the spiral surface at the nozzle inlet. Under the action of compressed air, it passes through the nozzle and the hollow spindle and is twisted into yarn by vortex spinning. The draw ratio is 102 times.

[0089] (4) The yarn is finally wound by the friction roller to obtain a coarse count vortex spun lye-viscose blended yarn. The friction roller pad is 6.8 mm, the spinning tension is 180 mN, and the yarn count is 10.

[0090] In addition, after a breakage occurs during the production of the rayon-viscose blended yarn, the splicing carriage operates, with the large suction nozzle finding the breakage point and the small suction nozzle generating the breakage point. After untwisting and retwisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. The splicer model is a V-type splicer, with a back roller initialization rate of 40%, untwisting pressure of 0.80 MPa, auxiliary untwisting pressure of 0.70 MPa, retwisting pressure of 0.75 MPa, small suction nozzle negative pressure of 0.70 MPa, small suction nozzle auxiliary untwisting pressure of 0.50 MPa, yarn untwisting time of 0.60 s, yarn untwisting time of 0.50 s, retwisting time of 0.42 s, Ln rod position of -4, and upper untwisting tube position of -2 filaments. The appearance of the joint is as follows: Figure 6 As shown.

[0091] Example 10

[0092] This embodiment provides a production process for vortex-spun lyocell / viscose blended coarse yarn. The resulting vortex-spun lyocell / viscose blended coarse yarn is a double-structured coarse yarn. The core fibers of the coarse yarn are arranged in parallel and are untwisted. The outer layer of the core fibers consists of twisted end fibers that are wrapped and wrapped by airflow. The raw materials used, lyocell fibers, have a fineness of 1.33 dtex and a length of 38 mm. The raw materials, viscose fibers, also have a fineness of 1.33 dtex and a length of 38 mm.

[0093] The production process of the above-mentioned vortex-spun lyoviscose blended coarse yarn includes the following steps:

[0094] (1) First, the Lyocell fiber and the viscose fiber are combed into strips to form Lyocell strips with a weight of 7.2g / m and viscose strips with a weight of 7.2g / m respectively;

[0095] Among them, the cylinder speed for producing Lyocell swabs is 420m / min, the flats speed is 180m / min, and the swab output speed is 120m / min; the cylinder speed for producing viscose swabs is 420m / min, the flats speed is 150m / min, and the swab output speed is 180m / min.

[0096] (2) Combining and drafting: The Lyocell sliver and viscose sliver obtained in step (1) are combined and arranged according to the required blending ratio of the yarn (60 / 40), and then, after three rounds of drawing and drafting, a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m is formed.

[0097] Among them, the number of slivers combined in the first process is 5, the number of Lyocell slivers is 3, the number of viscose slivers is 2, and the draw ratio is 5.14.

[0098] (3) The rayon-viscose blended sliver obtained in step (2) is fed into the bell mouth of the vortex spinning feeder. The rayon-viscose blended fiber sliver is simultaneously drawn into a sliver by four rollers and output into the nozzle from the front roller. It moves at high speed along the spiral surface at the nozzle inlet. Under the action of compressed air, it passes through the nozzle and the hollow spindle and is twisted into yarn by vortex spinning. The draw ratio is 163 times.

[0099] (4) The yarn is finally wound by the friction roller to obtain a coarse count vortex spun lye-viscose blended yarn. The friction roller pad is 4.5 mm, the spinning tension is 170 mN, and the yarn count is 16.

[0100] In addition, after a breakage occurs during the production of the rayon-viscose blended yarn, the splicing carriage operates, with the large suction nozzle finding the breakage point and the small suction nozzle generating the breakage point. After untwisting and retwisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. The splicer model is a V-type splicer, with a back roller initiation rate of 70%, untwisting pressure of 0.75 MPa, auxiliary untwisting pressure of 0.20 MPa, retwisting pressure of 0.70 MPa, small suction nozzle negative pressure of 0.50 MPa, small suction nozzle auxiliary untwisting pressure of 0.50 MPa, yarn untwisting time of 0.55 s, yarn untwisting time of 0.45 s, retwisting time of 0.40 s, Ln rod position of -4, and upper untwisting tube position of 0 filaments. The appearance of the joint is as follows: Figure 7 As shown.

[0101] The average strength, splice strength, and splice strength ratio of the rayon-viscose blended coarse yarns obtained in Examples 8-10 were tested (the splice strength was tested using a tensile tester), and the results are shown in Table 2.

[0102]

[0103] As shown in Table 1 above, the splice strength of the vortex-spun lyoviscose blended coarse yarns (6 count, 10 count, and 16 count) obtained in Examples 8-10 all reached more than 40%, which exceeded the splice quality of other existing yarns (10-20S), and the original yarn strength was controlled at 45%.

[0104] Example 11

[0105] This embodiment provides a production process for vortex-spun lyocell / viscose blended coarse yarn. The resulting vortex-spun lyocell / viscose blended coarse yarn is a double-structured coarse yarn. The core fibers of the coarse yarn are arranged in parallel and are untwisted. The outer layer of the core fibers consists of twisted end fibers that are wrapped and encased by airflow rotation. The raw material lyocell fiber has a fineness of 1.33 dtex and a length of 32 mm. The raw material viscose fiber has a fineness of 1.67 dtex and a length of 38 mm.

[0106] The production process of the above-mentioned vortex-spun lyoviscose blended coarse yarn includes the following steps:

[0107] (1) First, the Lyocell fiber and the viscose fiber are combed into strips to form Lyocell strips with a weight of 7.5 g / m and viscose strips with a weight of 5.1 g / m respectively;

[0108] Among them, the cylinder speed for producing Lyocell swabs is 420m / min, the flats speed is 180m / min, and the swab output speed is 115m / min; the cylinder speed for producing viscose swabs is 420m / min, the flats speed is 150m / min, and the swab output speed is 170m / min.

[0109] (2) Combining and drafting: The Lyocell sliver and viscose sliver obtained in step (1) are combined and arranged according to the required blending ratio of the yarn (88 / 12), and then, after three rounds of sliver drawing and drafting, a Lyocell / Viscose blended sliver with a weight of 6.2 g / m is formed.

[0110] Among them, the number of slivers combined in the first process is 6, the number of Lyocell slivers is 5, the number of viscose slivers is 1, and the draw ratio is 6.87.

[0111] (3) The rayon-viscose blended sliver obtained in step (2) is fed into the bell mouth of the vortex spinning feeder. The rayon-viscose blended fiber sliver is simultaneously drawn into a sliver by four rollers and output into the nozzle from the front roller. It moves at high speed along the spiral surface at the nozzle inlet. Under the action of compressed air, it passes through the nozzle and the hollow spindle and is twisted into yarn by vortex spinning. The draw ratio is 105 times.

[0112] (4) The yarn is finally wound by the friction roller to obtain a coarse count vortex spun lye-viscose blended yarn. The friction roller pad is 6.8 mm, the spinning tension is 180 mN, and the yarn count is 10.

[0113] Example 12

[0114] This embodiment provides a production process for vortex-spun lyocell / viscose blended coarse yarn. The resulting vortex-spun lyocell / viscose blended coarse yarn is a double-structured coarse yarn. The core fibers of the coarse yarn are arranged in parallel and are untwisted. The outer layer of the core fibers consists of twisted end fibers that are wrapped and wrapped by airflow. The raw material lyocell fiber has a fineness of 1.33 dtex and a length of 38 mm. The raw material viscose fiber has a fineness of 1.67 dtex and a length of 38 mm.

[0115] The production process of the above-mentioned vortex-spun lyoviscose blended coarse yarn includes the following steps:

[0116] (1) First, the Lyocell fiber and the viscose fiber are combed into strips to form Lyocell strips with a weight of 6.17 g / m and viscose strips with a weight of 7.2 g / m respectively;

[0117] For the production of Lyocell tweezers, the cylinder speed is 420 m / min, the flats speed is 180 m / min, and the sliver output speed is 140 m / min; for the production of viscose tweezers, the cylinder speed is 420 m / min, the flats speed is 150 m / min, and the sliver output speed is 180 m / min.

[0118] (2) Combining and drafting: The viscose sliver and lyocell sliver obtained in step (1) are combined and arranged according to the required blending ratio of the yarn (70 / 30), and then, after three rounds of sliver drawing and drafting, a lyocell-viscose blended sliver with a weight of 5.8 g / m is formed.

[0119] Among them, the number of slivers combined in the first process is 6, the number of Lyocell slivers is 2, the number of viscose slivers is 4, and the draw ratio is 7.09.

[0120] (3) The rayon-viscose blended sliver obtained in step (2) is fed into the bell mouth of the vortex spinning feeder. The rayon-viscose blended fiber sliver is simultaneously drawn into a sliver by four rollers and output into the nozzle from the front roller. It moves at high speed along the spiral surface at the nozzle inlet. Under the action of compressed air, it passes through the nozzle and the hollow spindle and is twisted into yarn by vortex spinning. The draw ratio is 157 times.

[0121] (4) The yarn is finally wound by the friction roller to obtain a coarse count vortex spun lye-viscose blended yarn. The friction roller pad is 4.5 mm, the spinning tension is 170 mN, and the yarn count is 16.

[0122] The above provides a detailed description of a method for producing coarse-count eddy coarse yarn using vortex spinning and viscose blending. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A production process for vortex-spun lyoviscose blended coarse-count yarn, characterized in that, Includes the following steps: S1 carding: Using Lyocell fiber and viscose fiber as raw materials, the Lyocell fiber is carded to form Lyocell slivers with a weight of 4.5-7.5g / m, and the viscose fiber is carded to form viscose slivers with a weight of 4.5-7.5g / m. The fineness of lyocell fiber is 1.0-1.67 dtex, and the length is 30-50 mm; the fineness of viscose fiber is 1.0-1.67 dtex, and the length is 30-50 mm. S2 doubling and drafting: The Lyocell sliver and viscose sliver obtained in step S1 are doubled and arranged according to the blending ratio, and then three doubling and three drafting are performed to form a Lyocell-Viscose blended sliver with a weight of 5.5-7.0 g / m. S3 Drafting and Wrapping: The rayon-viscose blended sliver obtained in step S2 is fed into a vortex spinning machine for drafting and wrapping to form a primary rayon-viscose blended coarse yarn; wherein, the model of the vortex spinning machine is Murata 870EX. S4 winding: Using friction rollers, the initial product of the rayon-viscose blended coarse yarn obtained in step S3 is wound into shape to obtain rayon-viscose blended coarse yarn with a count of 6-16S. The production process also includes splicing treatment of the lycopene-viscose blended coarse-count yarn, specifically including: The splicing carriage operates with the large suction nozzle finding the starting point and the small suction nozzle generating the starting point. After untwisting and twisting by the splicer, a continuous rayon-viscose blended coarse-count yarn is obtained. Specifically, the back roller starting rate is 40-80%, the untwisting pressure is 0.70-0.90 MPa, the auxiliary untwisting pressure is 0.20-0.80 MPa, the twisting pressure is 0.70-0.90 MPa, the small suction nozzle negative pressure is 0.50-0.70 MPa, the small suction nozzle auxiliary untwisting pressure is 0.50-0.60 MPa, the yarn untwisting time is 0.55-0.65 s, the yarn untwisting time is 0.45-0.55 s, the twisting time is 0.40-0.45 s, the Ln rod position is -4 to -1, and the upper untwisting tube position is -3. When processing the joints, the splicing carriage model 87CEX is used, and a V-type splicer is employed.

2. The production process of vortex-spun rayon-viscose blended coarse yarn according to claim 1, characterized in that, In step S1, during the formation of Lyocell sliver, the cylinder speed is 380-420 m / min, the cover plate speed is 150-200 m / min, and the sliver exit speed is 120-160 m / min.

3. The production process of vortex-spun lyoviscose blended coarse-count yarn according to claim 1 or 2, characterized in that, In step S1, during the formation of the adhesive cotton strip, the cylinder speed is 400-440 m / min, the cover plate speed is 120-180 m / min, and the strip output speed is 140-180 m / min.

4. The production process of vortex-spun lyoviscose blended coarse yarn according to claim 1, characterized in that, In step S2, the blending ratio refers to the weight ratio of Lyocell slivers to viscose slivers being 10-90:10-90.

5. The production process of vortex-spun lyoviscose blended coarse-count yarn according to claim 1 or 4, characterized in that, In step S2, the total number of strands is 5-8, and the draw ratio is 5.0-8.

5.

6. The production process of vortex-spun lyoviscose blended coarse yarn according to claim 1, characterized in that, In step S3, the draft ratio is 60-165 times, and the spinning speed is 400-480m / min.

7. The production process of vortex-spun lyoviscose blended coarse yarn according to claim 1, characterized in that, In step S4, the thickness of the gasket of the friction roller is 4.5-6.8 mm, and the tension of the initial product of the rayon-viscose blended coarse yarn is 170-200 mN.

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