All-cotton rigid core elastic composite yarn and preparation method thereof

Abstract

The invention relates to the technical field of spinning, in particular to an all-cotton rigid core elastic composite yarn and a preparation method thereof. The yarn count of the all-cotton steel core elastic composite yarn is 20-40 Ne; cotton fiber core yarn is arranged in the center of the all-cotton rigid core elastic composite yarn, and a cotton fiber outer wrapping layer is wound around the cotton fiber core yarn in a wrapping mode. The cotton fiber core yarn accounts for 60%-70% by mass of the all-cotton rigid core elastic composite yarn, the balance is the cotton fiber outer wrapping layer, and the cotton content of the all-cotton rigid core elastic composite yarn is larger than or equal to 99.9%. The preparation method of the all-cotton rigid core elastic composite yarn sequentially comprises a cotton fiber core yarn technological process and an all-cotton rigid core elastic composite yarn production process. The all-cotton rigid core elastic composite yarn prepared by the invention is natural in component, plump and fluffy in exterior, slightly elastic in interior and bony, and can bring rich texture experience to fabrics; fabric made of the all-cotton rigid core elastic composite yarn can keep a good shape and is high in quality and high in durability.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, and particularly to a fully cotton rigid core elastic composite yarn and a preparation method thereof. Background Art

[0002] In the development process of the textile industry, fully cotton fabrics have always been favored by consumers due to many excellent properties such as naturalness, comfort, and breathability. With the continuous improvement of people's living standards and the increasing specialization and refinement of the quality requirements for textiles, the performance expectations for fully cotton fabrics are also rising continuously.

[0003] At present, the development of the fully cotton fabric industrial chain has been relatively mature. From the cultivation of raw material cotton to the production of the final fabric products, it covers a series of links from the selection, carding, spinning to weaving of cotton raw materials. Among them, the fully cotton yarn processing technology has a crucial impact on the performance indicators of fully cotton fabrics. Since the market generally focuses on the soft and comfortable hand feeling of fully cotton fabrics, the conventional fully cotton yarn processing technology often focuses on the carding of cotton fibers, the twist control in the spinning process, etc., in order to make the fabric fit the skin as much as possible, based on the soft touch experience of the wearer.

[0004] However, precisely due to the pursuit of soft hand feeling, the fully cotton yarns prepared by the conventional fully cotton yarn processing technology are insufficient in terms of bone feeling and mechanical elasticity. On the one hand, to make the yarn have obvious bone feeling, usually the yarn needs to have a certain degree of compactness and support force in its structure. However, the conventional spinning and weaving processes are difficult to construct a yarn structure that can endow the fabric with sufficient bone feeling while ensuring a soft hand feeling. On the other hand, for mechanical elasticity, the elasticity of fully cotton fibers themselves is relatively limited, and the conventional fully cotton yarn processing technology has not effectively improved or supplemented the elastic mechanism. Therefore, the fully cotton fabrics made of such fully cotton yarns perform poorly in maintaining their shape and have low durability.

[0005] In the prior art, in order to improve the bone feeling and mechanical elasticity of the yarn, siro-spun core-spun yarn can be prepared by siro-spun core-spun technology or the twist can be increased during the spinning process. However, for fully cotton yarns, if fully cotton siro-spun core-spun yarns are prepared, the core yarn and the outer fiber layer are both made of cotton fibers, and there will be no obvious improvement in bone feeling and mechanical elasticity. If the twist is increased during the spinning process, although the twisting action can enhance the cohesion between fibers and improve the mechanical properties of the yarn, as the twist of the yarn increases, its hand feeling will also become harder, sacrificing some softness and unable to meet the requirement for the soft hand feeling of fully cotton fabrics.

[0006] Therefore, it is difficult for the fully cotton yarns produced by using the existing fully cotton yarn processing technology to simultaneously meet the requirements of soft handfeel, having a sense of stiffness and certain mechanical elasticity. As a result, the fully cotton fabrics produced are relatively single in texture experience and difficult to meet the market demand for high-quality and multi-functional fully cotton fabrics. Summary of the Invention

[0007] Aiming at the problem that the existing fully cotton yarns are difficult to simultaneously meet the requirements of soft handfeel, having a sense of stiffness and certain mechanical elasticity, the present invention provides a fully cotton rigid core elastic composite yarn and a preparation method thereof. The fully cotton rigid core elastic composite yarn has natural components and a unique handfeel of being plump and fluffy on the outside, slightly elastic and having a sense of stiffness on the inside, which can bring a rich texture experience to the fabric. The fabric made of the fully cotton rigid core elastic composite yarn can maintain a good shape, with high quality and strong durability.

[0008] In the first aspect, the present invention provides a fully cotton rigid core elastic composite yarn, and the yarn count of the fully cotton rigid core elastic composite yarn is 20 - 40 English counts; The central part of the fully cotton rigid core elastic composite yarn is a cotton fiber core yarn, and the cotton fiber core yarn is wound and wrapped with a cotton fiber outer layer; By mass percentage, the proportion of the cotton fiber core yarn in the fully cotton rigid core elastic composite yarn is 60% - 70%, and the balance is the cotton fiber outer layer. The cotton content of the fully cotton rigid core elastic composite yarn ≥ 99.9%.

[0009] Furthermore, the elastic elongation rate of the fully cotton rigid core elastic composite yarn is 12.5% - 15.5%.

[0010] Furthermore, the elastic recovery rate of the fabric made of the fully cotton rigid core elastic composite yarn is 84.21% - 85.23%, and the residual rate of arching deformation ≤ 3%.

[0011] In the second aspect, the present invention provides a preparation method of the above-mentioned fully cotton rigid core elastic composite yarn, which successively includes a cotton fiber core yarn process flow and a fully cotton rigid core elastic composite yarn production process; The raw material of the cotton fiber core yarn process flow is fine-wool cotton, including a first carding and combing process, a first preparation process, a first combing process, a first drawing process, a first roving process, a first spinning process, and a first winding process. The cotton fiber core yarn is obtained through the cotton fiber core yarn process flow; The production process of the all-cotton rigid core elastic composite yarn includes using long-staple cotton as raw material to carry out the second carding process, the second preparation process, the second combing process, the second drawing process, and the second roving process to obtain cotton fiber rovings. Then, using the cotton fiber rovings and cotton fiber core yarn as raw materials, carry out the second spinning process, the second steaming and shaping process, and the second winding process to obtain the all-cotton rigid core elastic composite yarn. Among them, in the second spinning process, the cotton fiber core yarn and the cotton fiber rovings are fed into the drafting system of the spinning equipment and laid flat and converged, and then continuous rotation twisting is carried out on the cotton fiber core yarn, so that the cotton fibers on the cotton fiber rovings are wound around the surface of the cotton fiber core yarn to form a cotton fiber outer layer.

[0012] Further, the twist factor of the first spinning process is 380 - 420, and the twist direction is Z twist or S twist.

[0013] Further, in the second preparation process, 6 strands are combined in the pre-drawing, the pre-drawing quantitative is 16.50 - 17.50 g / 5m, and the sliver lap quantitative is 35 - 40 g / m; In the second combing process, the carding gauge is 19‰ - 22‰ inches, and the combing quantitative is 16.00 - 17.50 g / 5m; In the second drawing process, the number of drawing passages is 2, the number of drawing strands is 6, the draft multiple in the back zone of drawing is 1.36 - 1.66 times, and the drawing quantitative is 13.50 - 16.50 g / 5m; In the second roving process, the roving quantitative is 1.5 - 3.5 g / 10m, the twist factor is 95 - 100, and the twist direction is Z twist.

[0014] Further, the twist factor of the second spinning process is 330 - 350, and the twist direction is the same as that of the first spinning process.

[0015] Further, in the second spinning process, the draft multiple in the back zone of spinning is 1.21 times, the front roller speed of spinning is 160 - 180 r / min, the drafting gauge of spinning is 18×68m, the front pressure bar nip is 2.5 - 3.0 mm, and the tension of the cotton fiber core yarn is 1.025 times.

[0016] Further, the second steaming and shaping process is divided into a preheating stage S1 and a main shaping stage S2. The steaming temperature in S1 is 60 - 70 °C, and the steaming time in S1 is 5 - 7 min; the steaming temperature in S2 is 85 - 105 °C, the steaming time in S2 is 50 - 90 min, and after steaming in S2, the yarn is naturally dried for 24 h.

[0017] Further, in the second winding process, the autocon winding speed is 900 - 1100 r / min, and the number of broken ends is controlled within 210 pieces per 100 tubes.

[0018] The beneficial effects of the present invention are as follows: 1. The preparation method of the all-cotton rigid core elastic composite yarn provided by the present invention adopts continuous rotation and twisting of the cotton fiber core yarn, driving the cotton fibers on the cotton fiber roving to wrap around the surface of the cotton fiber core yarn to form a cotton fiber outer layer. Under the action of continuous twisting, the cotton fiber core yarn has a sense of bone, and the twist contraction brought by twisting also endows the cotton fiber core yarn with a certain mechanical elasticity. The cotton fiber outer layer wrapped around the surface of the cotton fiber core yarn has the characteristics of being fluffy and soft. Therefore, the all-cotton rigid core elastic composite yarn has a unique hand feeling of being plump and fluffy on the outside, slightly elastic and having a sense of bone on the inside, which can bring a rich texture experience to the fabric.

[0019] 2. The cotton content of the all-cotton rigid core elastic composite yarn provided by the present invention is ≥99.9%, the composition is natural, and it has affinity and comfort. The elastic elongation rate of the cotton rigid core elastic composite yarn is 12.5%-15.5%, and the elastic recovery rate of the fabric made of the all-cotton rigid core elastic composite yarn is 84.21%-85.23%, and the residual rate of arching deformation is ≤3%. This makes the fabric not easy to deform or shrink during use, can maintain a good shape, and has high fabric quality and strong durability. Specific Embodiments

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] Example 1 A preparation method of an all-cotton rigid core elastic composite yarn successively includes a cotton fiber core yarn process flow and an all-cotton rigid core elastic composite yarn production process; The raw material of the cotton fiber core yarn process flow is 100% Xinjiang fine cotton, including the first carding and combing process, the first preparation process, the first combing process, the first drawing process, the first roving process, the first spinning process, and the first winding process. The cotton fiber core yarn is obtained through the cotton fiber core yarn process flow, and the yarn count of the cotton fiber core yarn is 44.7 English counts; Among them, the twist coefficient of the first spinning process is 380, and the twist direction is Z twist; The all-cotton rigid core elastic composite yarn production process includes: (1) The cotton blending process, selecting 100% Xinjiang long-staple cotton as the raw material of the cotton fiber roving; (2) The second carding and combing process: Card and comb the long-staple cotton from Xinjiang. During the carding and combing process, use the FA106 porcupine opener and the A076 single-drum scutcher in sequence. Since the long-staple cotton from Xinjiang has more impurities, the "multi-impurity removal and flexible carding" process principle is adopted for carding and combing; the FA106 porcupine opener uses a needle roller beater, the beater speed is 4800 r / min, and the bar angle of the FA106 porcupine opener is 120°; the beater speed of the A076F single-drum scutcher is 840 r / min, the fan speed is 960 r / min, the distance between the three-wing beater and the feed roller is 12 mm, and the weight per meter of the cotton lap is 430 g / m; the speed of the carding cylinder is 410 r / min, the speed of the licker-in is 840 r / min, the ratio of cylinder to licker-in is 2.5:1, the speed of the flat is 20.9 cm / min, the machine speed is 60 m / min, and the carding weight per unit length is 18.50 g / 5m.

[0022] (3) The second preparation process: For the pre-drawing, 6 strands are combined, the draft distance is 7mm×12mm, the back zone draft multiple is 1.77 times, and the pre-drawing weight per unit length is 17.00 g / 5m; the weight per unit length of the sliver lap is 40 g / m; (4) The second combing process: Adopt the "slow machine speed and precise carding" process principle. The combing machine speed is 145 strokes per minute. Reverse feeding is used to enhance the carding effect, and the waste distance is 13 mm; the carding distance is 19%-22‰ inches; the top comb distance is 1.5×0.75 mm, the draft distance is 12 mm, and the combing weight per unit length is 17.00 g / 5m; (5) The second drawing process: Adopt the process configuration of "less combination and reverse draft". The number of combination passes is 2, the number of combined strands is 6×8, the back zone draft multiple of the first drawing is 1.66 times, and the weight per unit length of the first drawing is 15.50 g / 5m; the back zone draft multiple of the last drawing is 1.36 times, and the weight per unit length of the last drawing is 15.00 g / 5m; (6) The second roving process: To improve and ensure the discreteness of the outer-layer fibers, the roving adopts the process configuration of "heavy pressure and small twist factor". The roving weight per unit length is 2.0 g / 10m, the twist factor is 98, the twist direction is Z twist, and the cotton fiber roving is produced; (7) The second roving process: Using the cotton fiber roving obtained in step (6) and the cotton fiber core yarn obtained from the cotton fiber core yarn process flow as raw materials. By mass percentage, the proportion of the cotton fiber core yarn in the raw materials is 67%, and the proportion of the cotton fiber roving is 33%. Feed the cotton fiber core yarn and the cotton fiber roving into the drafting system of the spinning equipment and lay them flat and converge. Then, continuously rotate and twist the cotton fiber core yarn so that the cotton fibers on the cotton fiber roving wind around the surface of the cotton fiber core yarn to form a cotton fiber outer layer. The draft multiple in the back zone of the roving is 1.21 times, the speed of the front roller of the roving is 170 r / min, the draft gauge of the roving is 18×68 m, the front pressure bar nip is 2.75 mm, the agglomeration negative pressure is 3500 Mpa, the core yarn tension is 1.025 times, the twist coefficient is 340, and the twist direction is Z twist; (8) The second steaming and setting process: The second steaming and setting process is divided into a preheating stage S1 and a main setting stage S2. The steaming temperature in S1 is 65°C, and the steaming time in S1 is 6 min; the steaming temperature in S2 is 100°C, and the steaming time in S2 is 85 min. After steaming in S2, let the yarn dry naturally for 24 h; (9) The second winding process: The self-winding speed is 1000 r / min. Optimize the splicing quality parameters and the parameter curve of the electronic yarn clearer to reduce the number of broken ends. The untwisting air pressure is 0.65 Mpa, and the untwisting time is 0.85 s; the twisting air pressure is 0.6 Mpa, and the twisting time is 0.08 s. The splicing length is 2.67 mm. Control the number of broken ends within 210 pieces per 100 tubes to obtain a 100% cotton rigid core elastic composite yarn with a yarn count of 30 English counts.

[0023] Example 2 A method for preparing a 100% cotton rigid core elastic composite yarn, which successively includes the cotton fiber core yarn process flow and the 100% cotton rigid core elastic composite yarn production process; The raw material of the cotton fiber core yarn process flow is 100% Xinjiang fine long-staple cotton, including the first carding and combing process, the first preparation process, the first combing process, the first drawing process, the first roving process, the first roving process, the first winding process. After the cotton fiber core yarn process flow, the cotton fiber core yarn is obtained, and the yarn count of the cotton fiber core yarn is 59.5 English counts; Among them, the twist coefficient in the first roving process is 400, and the twist direction is S twist; The 100% cotton rigid core elastic composite yarn production process includes: (1) The cotton blending process: Select 100% Xinjiang long-staple cotton as the raw material of the cotton fiber roving; (2) The second carding process: Card the long-staple cotton from Xinjiang. During the carding process, use a FA106 porcupine opener and an A076 single-drum coiler in sequence. The carding process adopts the process principle of "multiple impurity removal and flexible carding". The FA106 porcupine opener uses a needle roller beater, the beater speed is 4800 r / min, and the bar angle of the FA106 porcupine opener is 120°. The beater speed of the A076F single-drum coiler is 840 r / min, the fan speed is 960 r / min, the distance between the three-wing beater and the feed roller is 12 mm, and the weight per meter of the carded cotton is 430 g / m. The speed of the carding cylinder is 410 r / min, the speed of the licker-in is 840 r / min, the ratio of cylinder to licker-in is 2.5:1, the speed of the flat is 20.9 cm / min, the machine speed is 60 m / min, and the carding weight per unit length is 18.50 g / 5m.

[0024] (3) The second preparation process: For the pre-drawing, 6 strands are combined, the draft distance is 7 mm × 12 mm, the back zone draft multiple is 1.77 times, and the pre-drawing weight per unit length is 16.50 g / 5m; the weight per unit length of the sliver lap is 35 g / m; (4) The second combing process: Adopt the process principle of "slow machine speed and precise carding". The combing machine speed is 145 strokes per minute. The reverse feeding enhances the carding effect, and the waste distance is 13 mm; the carding distance is 19%-22‰ inches; the top comb distance is 1.5 × 0.75 mm, the draft distance is 12 mm, and the combing weight per unit length is 16.00 g / 5m; (5) The second drawing process: Adopt the process configuration of "less combination and reverse draft". The number of combination passes is 2, the number of combined strands is 6×8, the back zone draft multiple of the first drawing is 1.66 times, and the weight per unit length of the first drawing is 14.50 g / 5m; the back zone draft multiple of the last drawing is 1.36 times, and the weight per unit length of the last drawing is 13.50 g / 5m; (6) The second roving process: To improve the discreteness of the outer wrap fibers, the roving adopts the process configuration of "heavy pressure and small twist factor". The roving weight per unit length is 1.5 g / 10m, the twist factor is 100, the twist direction is Z twist, and cotton fiber roving is produced; (7) The second spinning process: Use the cotton fiber core yarn obtained from the cotton fiber core yarn process flow and the cotton fiber roving obtained in step (6) as raw materials. By mass percentage, the proportion of the cotton fiber core yarn in the raw materials is 67%, and the proportion of the cotton fiber roving is 33%. Feed the cotton fiber core yarn and the cotton fiber roving into the drafting system of the spinning equipment and lay them flat and converge. Then continuously rotate and twist the cotton fiber core yarn so that the cotton fibers on the cotton fiber roving wrap around the surface of the cotton fiber core yarn to form a cotton fiber outer wrap layer. The back zone draft multiple of the spinning is 1.21 times, the speed of the front roller of the spinning is 160 r / min, the draft distance of the spinning is 18×68 m, the front pressure bar jaw is 2.5 mm, the agglomeration negative pressure is 3500 Mpa, the core yarn tension is 1.025 times, the twist factor is 340, and the twist direction is S twist; (8) The second yarn steaming and setting process is divided into a preheating stage S1 and a main setting stage S2. The steaming temperature in S1 is 60°C and the steaming time in S1 is 5 minutes; the steaming temperature in S2 is 95°C and the steaming time in S2 is 70 minutes. After steaming in S2, the yarn is naturally air-dried for 24 hours. (9) The second winding process: The self-winding speed is 900 r / min. Optimize the twist splicing quality parameters and the electronic yarn clearer parameter curve to reduce the number of broken ends. The untwisting air pressure is 0.65 Mpa, and the untwisting time is 0.85 s; the twisting air pressure is 0.6 Mpa, the twisting time is 0.08 s, and the twist splicing length is 2.67 mm. Control the number of broken ends within 210 pieces per 100 tubes to obtain a fully cotton rigid core elastic composite yarn with a yarn count of 40 English counts.

[0025] Comparative Example 1 Use the siro-spun core-spun yarn production process to prepare a fully cotton combed siro-spun core-spun yarn, which successively includes the core yarn process flow and the siro-spun core-spun yarn production process.

[0026] The raw material of the core yarn process flow is 100% Xinjiang fine cotton, including the first carding and combing process, the first preparation process, the first combing process, the first drawing process, the first roving process, the first spinning process, and the first winding process. After the core yarn process flow, the core yarn is obtained. The yarn count of the core yarn is 40 English counts, the twist per unit length is 89.8 twists / 10 cm, and the twist direction is S twist.

[0027] The siro-spun core-spun yarn production process includes: (1) The cotton blending process: Select 100% Xinjiang fine cotton as the raw material for the fiber layer roving. (2) The second carding and combing process: Card and comb the Xinjiang fine cotton. During the carding and combing process, use a FA106 porcupine opener and an A076 single-drum scutcher in sequence. The FA106 porcupine opener uses a porcupine sawtooth beater, and the beater speed is 620 r / min. The beater speed of the A076F single-drum scutcher is 1040 r / min, the fan speed is 1300 r / min, and the weight per meter of the carded cotton is 530 g / m; the speed of the carding cylinder is 4500 r / min, the ratio of the cylinder to the licker-in is 2.2:1, and the carding weight per unit length is 20.00 g / 5 m. (3) The second preparation process: In the pre-drawing, 8 strands are combined, the draft gauge is 8 mm × 15 mm, and the weight per meter of the sliver lap is 45 g / m. (4) The second combing process: The waste lap gauge is 15 mm, the carding gauge is 17‰ - 20‰ inches, the draft gauge is 12 mm, and the weight per unit length of the combed sliver is 17.50 g / 5 m. (5) The second drawing process, with 2 drawing passages and 6×8 drawn slivers. The draft multiple in the back zone of the first drawing is 1.78 times, and the sliver weight per 5 m in the first drawing is 16.50 g; the draft multiple in the back zone of the last drawing is 1.45 times, and the sliver weight per 5 m in the last drawing is 14.50 g.

[0028] (6)The second roving process, with a roving weight of 2.0 g per 10 m, a twist factor of 120, and a Z twist direction, to produce a roving of the fiber layer; (7)The second spinning process, feeding the core yarn and the roving of the fiber layer into the spinning equipment in parallel. By mass percentage, the proportion of the core yarn is 67% and the proportion of the roving of the fiber layer is 33%; twisting the drawn roving of the fiber layer to wrap it around the core yarn to form a fiber layer, and producing a composite core-spun yarn. The twist of the composite core-spun yarn is 72 turns per 10 cm, and the twist direction is S twist; (8)The second winding process, with an autoconer speed of 1200 r / min and the number of end breaks controlled within 400 per 100 tubes, to produce a fully combed siro-spun core-spun cotton yarn with a yarn count of 30 English counts.

[0029] Comparative Example 2 A fully combed siro-spun core-spun cotton yarn with a yarn count of 40 English counts is produced using a conventional production process.

[0030] The difference between Comparative Example 2 and Comparative Example 1 lies in: The yarn count of the core yarn is 80 English counts, the twist is 140 turns per 10 cm, and the twist direction is Z twist; In step (7) of the siro-spun core-spun yarn production process, the twist of the composite core-spun yarn is 83.8 turns per 10 cm, and the twist direction is Z twist; The yarn count of the fully combed siro-spun core-spun cotton yarn is 40 English counts.

[0031] The evenness, yarn breaking strength, and breaking elongation of the fully combed rigid core elastic composite cotton yarn produced in Examples 1-2 and the fully combed siro-spun core-spun cotton yarns produced in Comparative Examples 1-2 are tested, and the test results are shown in Table 1.

[0032] Table 1 Test Results of Yarn Properties

[0033] From the comparison of the above yarn property test results, it can be seen that compared with the fully combed siro-spun core-spun cotton yarns produced in Comparative Examples 1-2, the fully combed rigid core elastic composite cotton yarns produced in Examples 1-2 have higher yarn evenness, and at the same time, their yarn breaking strength can be increased by about 8.9% - 10.5%, and their yarn breaking elongation is increased by about 29.6% - 32.9%.

[0034] The same process was used to process the all-cotton rigid-core elastic composite yarns prepared in Examples 1-2 and the all-cotton combed siro-spun core-spun yarns prepared in Comparative Examples 1-2 to obtain knitted single jersey fabrics of the same specification. The performance of the four knitted single jersey fabrics was tested, and the test results are shown in Table 2.

[0035] Table 2 Test Results of Fabric Performance

[0036] From the comparison of the above fabric performance test results, it can be seen that compared with the fabrics made from the yarns obtained in Comparative Examples 1-2, the fabric thickness of the fabrics made from the yarns obtained in Examples 1-2 increased by 10.5% - 10.9%, the fabric bulkiness increased by 20.13% - 23.12%, the elastic recovery rate increased by more than 37.73% - 48.69% and could reach 84.21% - 85.23%, and the residual rate of arch deformation decreased by 57.3% - 54.24% and could reach below 3%.

[0037] Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and all such modifications or substitutions should be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A pure cotton rigid core elastic composite yarn, characterized in that: The yarn count of the all-cotton rigid core elastic composite yarn is 20-40 English count; The central part of the all-cotton rigid core elastic composite yarn is a cotton fiber core yarn, and the cotton fiber core yarn is wrapped with a cotton fiber outer sheath; In terms of mass percentage, the cotton fiber core yarn accounts for 60%-70% of the all-cotton rigid-core elastic composite yarn, and the remainder is the cotton fiber outer covering. The cotton content of the all-cotton rigid-core elastic composite yarn is ≥99.9%.

2. The all-cotton rigid core elastic composite yarn according to claim 1, characterized in that: The elastic elongation of the all-cotton rigid core elastic composite yarn is 12.5%-15.5%.

3. The all-cotton rigid core elastic composite yarn according to claim 1, characterized in that: The elastic recovery rate of the fabric made of all-cotton rigid-core elastic composite yarn is 84.21%-85.23%, and the residual rate of arch deformation is ≤3%.

4. A method for preparing the all-cotton rigid core elastic composite yarn according to claim 1, characterized in that: It includes the cotton fiber core yarn process and the cotton rigid core elastic composite yarn production process in sequence; The raw material of the cotton fiber core yarn process is fine-staple cotton, which includes a first cleaning and combing process, a first preparation process, a first combing process, a first drawing process, a first roving process, a first spun yarn process, and a first winding process, and the cotton fiber core yarn is obtained through the cotton fiber core yarn process; The production process of the all-cotton rigid core elastic composite yarn includes using long-staple cotton as raw material to perform the second cleaning and combing process, the second preparation process, the second combing process, the second drawing process, and the second roving process to obtain cotton fiber roving, and then using cotton fiber roving and cotton fiber core yarn as raw materials to perform the second spinning process, the second steaming and shaping process, and the second winding process to obtain the all-cotton rigid core elastic composite yarn, wherein the second spinning process is to feed the cotton fiber core yarn and the cotton fiber roving into the drafting system of the spinning equipment, lay them flat and converge them, and then continuously rotate and twist the cotton fiber core yarn so that the cotton fibers on the cotton fiber roving are wrapped around the surface of the cotton fiber core yarn to form a cotton fiber outer sheath.

5. The preparation method according to claim 4, characterized in that: The twist coefficient of the first spinning process is 380-420, and the twist direction is Z twist or S twist.

6. The preparation method according to claim 4, characterized in that: In the second preparation process, 6 strips are pre-combined, the pre-combined weight is 16.50-17.50g / 5m, and the strip roll weight is 35-40g / m; In the second combing process, the combing gauge is 19‰-22‰ of English silk, and the combing basis weight is 16.00-17.50g / 5m; In the second drawing process, the number of drawing passes is 2, the number of strands is 6, the drafting multiple in the post-drawing zone is 1.36-1.66 times, and the drawing weight is 13.50-16.50g / 5m; In the second roving process, the roving weight is 1.5-3.5 g / 10 m, the twist coefficient is 95-100, and the twist direction is Z twist.

7. The preparation method according to claim 5, characterized in that: The twist coefficient of the second spinning process is 330-350, and the twist direction is the same as that of the first spinning process.

8. The preparation method according to claim 7, characterized in that: In the second spinning process, the drafting multiple of the spinning rear zone is 1.21 times, the speed of the spinning front roller is 160-180r / min, the spinning drafting gauge is 18×68m, the front pressure bar jaw is 2.5-3.0mm, and the tension of the cotton fiber core yarn is 1.025 times.

9. The preparation method according to claim 4, characterized in that: The second yarn steaming and shaping process is divided into a preheating stage S1 and a main shaping stage S2. The S1 yarn steaming temperature is 60-70°C and the S1 yarn steaming time is 5-7min; the S2 yarn steaming temperature is 85-105°C and the S2 yarn steaming time is 50-90min. After S2 yarn steaming, the yarn is naturally dried for 24h.

10. The preparation method according to claim 4, characterized in that: In the second winding process, the winding speed is 900-1100r / min, and the number of broken ends is controlled within 210 pieces / hundred tubes.

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