Smooth and soft elastic yarn as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of fabric spinning, and particularly relates to smooth and soft elastic yarn and a preparation method and application thereof. Skin short fibers of the yarn are one or more of natural fibers and chemical fibers in a blending mode, and the skin short fibers are made into rough yarn through a pre-spinning process. Yarn cores of the yarns are composite yarns of two or more of polyester fibers, modified polyester fibers, polyamide, spandex and polyolefin. The yarn core participates in core-spun production after being reversely twisted, the yarn is soft, the skin core is not prone to slipping when the whole yarn is woven, the yarn is smooth in surface and soft in hand feeling, fibers on the surface of the yarn are spirally arranged, and the yarn has the style similar to a mooring rope. The woven fabric is smooth and clean in cloth cover, soft in touch, comfortable and elastic, not prone to wrinkling when worn, capable of being worn without ironing after being washed, wide in fabric thickness range, suitable for being worn in four seasons of business and life of people, capable of meeting multiple requirements of comfortable body and face of people, and high-grade, comfortable and elastic.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric textiles, and in particular relates to a smooth and soft elastic yarn and a preparation method and application thereof. Background Art

[0002] In recent years, more and more elastic fabrics are made by directly using core-spun yarn, wrapped yarn or spandex stretch yarn. The comfortable elasticity can bring consumers a pleasant wearing experience. However, fabrics prepared by different implementation methods have corresponding advantages and effects, but also come with some shortcomings and defects.

[0003] Chinese patent CN101730762A discloses an elastic composite yarn, a textile fabric made of the same, and a method and device for making the same. The patent introduces a method for preparing a yarn and a fabric that achieves high elasticity and high recovery. From the patent content, there are still certain limitations in the preparation of the yarn and the thickness of the fabric: (1) The short fibers used in the double-core composite yarn introduced in the patent are limited to cotton, and do not involve other materials such as regenerated cellulose fibers. From the perspective of the difficulty of yarn production, cotton staple fibers, as a natural fiber, have a unique natural twist. Compared with artificially curled regenerated cellulose fibers, the friction between fibers is greater when produced in a single fiber state, and the production difficulty is lower. (2) The patent does not involve yarn counts, but it can be seen from the examples that there are only coarse yarn counts below 20 English counts, and the fabrics involved are all denim twill, which is more suitable for denim workwear. According to conventional experience in the field of spinning, it is very difficult to produce such double-core yarns with a yarn count of more than 30S. The indicators that affect the appearance of the fabric, such as the tightness of the yarn coating, the hairiness on the yarn surface, and the thick spots caused by the outer short fibers rolling up, are much higher than those of conventional core-spun yarns. Therefore, the yarn is not suitable for high-quality thin fabrics, especially shirt fabrics. (3) Because the double-spun elastic yarn has a yarn core and its proportion is generally above 20%, the outer short fibers increase the friction with the yarn core by increasing the twist when participating in the coating, so the yarn feels harder; at the same time, because of the presence of 20% filaments, the mutual friction between the short fibers is reduced, and the hairiness will be higher than that of conventional yarns with the same yarn count. Therefore, in order to ultimately maintain the smoothness of the fabric surface, higher requirements must be placed on the frequency and quality of singeing during the dyeing and finishing process. These patents do not mention the relevant content. Therefore, combined with the embodiments, it can be seen that the current patent is still on heavy fabrics and cannot meet the needs of thin and high-end shirt fabrics.

[0004] Chinese patent CN115125641A introduces a method for preparing a stretch yarn by wrapping filaments with elastic filaments, or by wrapping spun yarns with elastic filaments, or by wrapping filaments with spun yarns after being compounded. The advantage of the yarn of the invention is that it can be woven on a machine suitable for filament weaving or on a machine suitable for spun yarn weaving, and has a wide range of applicability. The disadvantage is that the wrapped yarn has leakage, and spandex or polyolefin is not easy to color, and the yarn is fluffy and not delicate enough, which is not suitable for high-end formal fabrics with high requirements for dyeing consistency.

[0005] Chinese patent CN115354433A introduces a non-wrinkle fabric and its production process and casual pants. The patent introduces that the non-wrinkle fabric uses double-core yarn in the warp direction. First of all, it is not clearly stated whether the two cores exist in parallel or in other ways; the patent introduces two ranges of yarn, one with outer yarn count less than or equal to 32S, and the other with 40S-50S, the yarn count is relatively coarse, and it can be seen from the weight range of the two fabric products that it is 320-360g / m 2 ,200~250g / m 2 , more suitable for trousers fabrics, not suitable for high-quality fabrics with a weight of 120g / m 2 High-end shirt fabric of about 100%; from the patent content, it can be seen that the preparation of the patented fabric is suitable for piece dyeing. If there are many appearance defects of yarns on the yarn-dyed fabric, they will appear; and the patent limits the fabric organization.

[0006] Chinese patent CN218026558U introduces a non-wrinkle fabric and casual pants, and the yarn and fabric preparation method used are basically similar to those of Chinese patent number CN115354433A.

[0007] Chinese patent CN110629342A introduces yarns and fabrics and production methods that prevent sliding and stretching, which mainly focuses on the research of yarn core performance. The yarn core contains low-melting point filaments. During the fabric processing, the low-melting point filaments melt to varying degrees and adhere to the outer short fibers and elastic filaments to avoid the sliding and stretching problem caused by the presence of elastic filaments when the fabric is cut and sewn. Summary of the invention

[0008] In view of the deficiencies in the prior art, the object of the present invention is to provide a smooth and soft elastic yarn, which is soft and fluffy with less hairiness.

[0009] The present invention also provides a preparation method thereof, wherein the yarn core is reversely twisted to increase the friction between the yarn core and the short fibers, and the short fibers participate in the twisting and winding molding of the final spinning in the form of multiple strands (the outer short fibers are natural fibers or chemical fibers), so that the friction between the yarn core and the short fibers and the friction and transfer between the short fibers are enhanced, and the short fibers are arranged in a cable-like manner on the yarn core with a large twist width, but the fibers are closely arranged, the yarn is soft and fluffy, with less hairiness, and the hairiness is better than that of compactly spun yarn.

[0010] The invention also provides an application thereof, which can be applied to comfortable stretch fabrics of high-quality yarn-dyed and piece-dyed shirts with high yarn count.

[0011] The preparation method of the smooth, soft and elastic yarn described in the present invention comprises the following steps: the outer sheath short fibers of the yarn are one or a blend of natural fibers and chemical fibers; the outer sheath short fibers are subjected to a pre-spinning process to obtain roving, and the fibers have good uniformity; the yarn core is a composite yarn of two or more of polyester fibers, modified polyester fibers, polyamide, spandex and polyolefin; the yarn core is reversely twisted and then participates in the core-spun production, the yarn core is stiffer and generates reverse friction with the outer sheath short fibers at the output front roller position, the yarn twist coefficient is lower than that of general core-spun yarn, and the yarn twist coefficient is between 270 and 470.

[0012] The yarn prepared by the present invention is soft, and the skin and core of the whole yarn are not likely to slip off during weaving. The woven fabric has a smooth surface, a soft touch, comfortable elasticity, is not easy to wrinkle when worn, can be worn after washing without ironing, has a wide range of fabric thickness, is suitable for people to wear in business and life in all seasons, meets people's multiple needs for decency and comfort, and is a high-end comfortable elastic fabric.

[0013] The natural fibers include cotton, flax, and animal fibers. The pre-processing procedure of the outer skin short fibers is as follows: the fibers are balanced in a room satisfying the conditions of a temperature of 22° C. to 28° C. and a relative humidity of 45% to 60%.

[0014] The pre-spinning process of producing roving of pure cotton staple fiber using cotton as raw material is as follows: the cotton fiber is pre-spinned after the process of cleaning-combing-pre-drawing-strip and rolling-combing-drawing-roving; the weight specification of the small roll in the combing process is 50-70g / m, the top comb needle tooth density is 30-35T / in, the total number of needle teeth of the cylinder is controlled at 37000-49000, and finally the fiber content of the combed sliver below 18mm fed into the drawing process machine after the drawing process is satisfied to be below 5.0%;

[0015] The pre-spinning process of the blended spinning of cotton and flax short fibers to produce roving is as follows: after the flax fibers are subjected to health pretreatment, the fiber separation degree is further improved, the cotton combed cotton net is mixed in a disc, the fiber mixing times are 2 to 3 times, and the mixed cotton layer is respectively passed through a cotton opener-rolling-carding machine-pre-drawing-drawing-roving to complete the pre-spinning;

[0016] The pre-spinning process of the blended yarn of cotton and wool short fibers is as follows: the wool blended with cotton is mixed in the drawing process of the pre-spinning process of the pure cotton short fiber yarn production process, the quantitative unevenness CV% of the mixed wool top is controlled within 2.0%, the wool particles in the wool top are controlled within ≤3 particles / g, the oil content of the wool is ≤1.0%, and the moisture regain is controlled within 10% to 16%. Balance treatment is required for those not within this range. The moisture regain, oil content and wool particles of the raw materials for other animal fibers are controlled, and the indicators are controlled according to those of wool.

[0017] The pre-spinning process of producing roving of the chemical fiber is as follows:

[0018] Blowing and carding - pre-drawing - first drawing - second drawing - roving;

[0019] The chemical fibers include: synthetic fibers, blended fibers of synthetic fibers and regenerated cellulose fibers or regenerated cellulose ester fibers;

[0020] Temperature and humidity control in the cleaning and combing process: temperature ≥ 22°C, relative humidity 46% to 60%, fiber specific resistance < 10 7 For specific resistance ≥ 10 7 The fiber needs to be balanced in the raw material balance room, and the balancing time is 8 to 24 hours, which will be adjusted according to the temperature and humidity conditions in the balance room and the season.

[0021] The weight of the yarn core accounts for 5% to 30% of the total weight of the yarn.

[0022] The yarn core needs to be pre-treated before core-wrapping. The specific operation is as follows: taking the final yarn with Z twist as an example, a single yarn or two or more yarn cores need to be twisted in S twist, and the twist coefficient is 50 to 400, which is determined according to the material of the yarn core.

[0023] The yarn core is a composite twist of one of polyester fiber, modified polyester fiber or polyamide and one of spandex and superelastic polyolefin, and the stretching ratio is 1-5.0.

[0024] The roving passes through the rear roller, the middle roller, the front roller in sequence, and then passes through the lower combing roller added between the front roller and the output roller, so that the short fiber strands are in a multi-strand form after coming out of the output roller and participate in the twisting and winding of the yarn. The schematic diagram of the device structure of the roving drafting, winding and twisting process is shown in FIG. Figure 1 shown.

[0025] The yarn core is located at the output part of the front roller when participating in twisting and winding. It is adjusted to the left or right according to the final yarn twist direction to ensure the final covering effect.

[0026] In the core-wrapping production process, the height of the yarn guide hook is adjusted to control the height from the output roller to the yarn guide hook to be 20 mm-40 mm.

[0027] When the yarn has low twist, there will be no increase in the number of ends broken due to spinning tension problems.

[0028] The application of the smooth and soft elastic yarn of the present invention is used to prepare elastic fabrics for yarn-dyed and piece-dyed shirts. Figure 2 .

[0029] The fabric preparation process is simple, the fabric surface is smooth, with few defects such as cotton knots and thick sections, the fabric surface has special grain and texture, feels soft and fluffy, and has good wrinkle resistance, which is very suitable for the preparation and production of high-end shirt fabrics.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The reverse twisting of the yarn core of the present invention increases the friction between the yarn core and the short fibers. The short fibers participate in the twisting and winding of the final spinning in the form of multiple strands (the outer short fibers are natural fibers or chemical fibers), so that the friction between the yarn core and the short fibers and the friction and transfer between the short fibers are enhanced. The short fibers are arranged in a cable-like manner on the yarn core, with a large twist width, but the fibers are closely arranged. The yarn is soft and fluffy, with less hairiness, and the hairiness is better than that of compactly spun yarn.

[0032] (2) The yarn produced by the present invention is soft, and the core of the whole yarn is not likely to slip off during weaving. The woven fabric has a smooth surface, soft touch, comfortable elasticity, is not easy to wrinkle when worn, can be worn after washing without ironing, has a wide range of fabric thickness, is suitable for people to wear in all seasons for business and life, and meets people's multiple needs for decency and comfort. It is a high-end comfortable elastic fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the device structure of the roving drafting, winding and twisting process of the present invention;

[0034] Figure 2 A process for preparing yarn-dyed and piece-dyed stretch fabrics for shirts from the yarn of the present invention;

[0035] In the figure:

[0036] 1. Back roller; 2. Middle roller; 3. Front roller; 4. Output roller; 5. Lower combing roller. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with embodiments, but the protection scope of the present invention is not limited thereto.

[0038] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0039] Example 1

[0040] The preparation method of the smooth and soft elastic yarn: cotton 50S (H400-30D + spandex 30D)

[0041] Production of outer skin short fiber: SUPIMA cotton is selected and balanced in a cotton bale balance room for 24 hours (balance room temperature 22℃~24℃, relative humidity 50%~55%), cotton bale - combing - pre-sliver drawing - sliver winding, sliver winding weight 56g / m, and then combing process: top comb needle tooth density is 35T / in, cylinder tooth 48000, output combed sliver with short fiber content below 18mm 4.9%, made by drawing - roving - spun yarn.

[0042] Yarn core production: Spandex 30D is stretched at a ratio of 3.2 and then twisted in the S direction with H400-30D empty package, with a twist of 10T / in. The roving passes through the rear roller, the middle roller, the front roller in sequence, and then passes through the lower combing roller added between the front roller and the output roller, so that the short fiber strands are in the form of three strands after coming out of the output roller, and are wrapped and twisted with the core yarn twisted in the S direction (Z), and the yarn guide hook is 40mm high to the top of the tube. The weight of the yarn core accounts for 36% of the total weight of the yarn, and 50S (H400-30D + spandex 30D) yarn is made, and the final twist coefficient of the yarn is 300.

[0043] Example 2

[0044] The preparation method of the smooth and soft elastic yarn: 60% LYOCELL 40% MODAL 50 (SSY / 30D + spandex 30D)

[0045] Sheath short fiber production: LYOCELL fiber specific resistance 2.03*10 8 , MODAL specific resistance 3.02*10 8 The two fibers were balanced in the raw material balance room for 24 hours (balance room temperature 22℃~24℃, relative humidity 50%~55%), and the fiber specific resistance after balance was <10 7 , and then the disc packing production is carried out, and the temperature and humidity of the cleaning and combing process are controlled: temperature ≥ 22℃, relative humidity 46% ~ 60%.

[0046] Blowing and carding - pre-drawing - first drawing - second drawing - roving, the roving weight is 4.7g / 10m.

[0047] Yarn core production: Spandex 30D is stretched at a ratio of 3.2 and then SSY-30D is wrapped and twisted in the S direction, with a twist of 12T / in. The yarn core is placed in the spinning workshop for 8 hours before spinning production.

[0048] The roving passes through the rear roller, the middle roller, and the front roller in sequence, and then passes through the lower combing roller added between the front roller and the output roller, so that the staple fiber strands are in the form of three strands after coming out of the output roller, and are wrapped and twisted with the core yarn twisted in the S direction (Z). The yarn guide hook is 40 mm high to the top of the tube, the yarn core ratio is 36%, and 60% LYOCELL 40% MODAL 50S (SSY-30D + spandex 30D) yarn is made, and the final twist coefficient of the yarn is 320.

[0049] Example 3

[0050] The preparation method of the smooth and soft elastic yarn: 80% cotton / 20% wool 50 (SSY / 30D+spandex 30D)

[0051] Sheath staple fiber production:

[0052] (1) SUPIMA cotton was selected and balanced in a cotton bale balance room for 24 h (balance room temperature 22°C-24°C, relative humidity 50%-55%), cotton bale-combing-pre-slivering-slivering, the slivering weight was 56 g / m, and then the combing process was carried out: the top comb needle tooth density was 35 T / in, the cylinder tooth was 48000, the output combed sliver had a short fiber content of 4.9% below 18 mm, and was made by drawing-roving-spinning.

[0053] (2) The wool top has a quantitative value of 19.95 g / 5 m, a quantitative unevenness CV% of 2.0%, 2 wool particles / g, a wool oil content of 0.72%, and a moisture regain of 10.0%. Due to the low moisture regain, the wool is placed in a balance room at a temperature of 28°C to 35°C and a relative humidity of 60% to 75% for 12 hours, and then mixed with the combed cotton top in the drawing process, drawing one - drawing two - drawing three - roving.

[0054] Yarn core production: Spandex 30D is stretched at a ratio of 3.2 and then SSY-30D is wrapped and twisted in the S direction, with a twist of 12T / in. The yarn core is placed in the spinning workshop for 8 hours before spinning production.

[0055] The coarse yarn passes through the rear roller, the middle roller, and the front roller in sequence, and then passes through the lower combing roller added between the front roller and the output roller, so that the short fiber strands are in the form of three strands after coming out of the output roller, and are wrapped and twisted with the core yarn twisted in the S direction (Z), and the yarn guide hook is 40mm high to the top of the tube to make 80% cotton 20% wool 50S (SSY-30D+spandex 30D) yarn, and the final yarn twist coefficient is 300.

[0056] Example 4

[0057] 60% LYOCELL 40% MODAL 50S (SSY / 30D + spandex 30D) smooth and soft elastic yarn is processed by the following process:

[0058] Warp yarn: The original yarn was whole, and the pretreatment was treated with chelating agent Raytexil SQ-B0.3g / L, refining agent SA-E0.8g / L of Lurui Fine Chemicals, and hydrogen peroxide 15g / L, the initial temperature was 40℃, the heating rate was 2℃ / min, and the yarn was treated at 85℃, the whiteness was 120, and the pH was 8.9. Dyeing: Colaine disperse dye NBSWF0.25%, RSWF0.115%, YSWF0.75%, soda ash Na2CO3 3g / L, 125℃, 40min dyeing, 80℃, 20min reduction cleaning; Lyocell / MODAL reactive dye Yorkshire NBBF0.215%, R3BF0.3%, Y3RF0.6%, 25g / L sodium sulfate, 10g / L soda ash, 60℃, 40min dyeing, and drying after dyeing.

[0059] Weft yarn: loose bobbin at 125℃, 20min boiling and setting, pre-treatment with chelating agent 0.3g / L, Lurui Fine Chemicals' refining agent SA-E0.8g / L, hydrogen peroxide 15g / L, initial temperature 40℃, heating rate 2℃ / min, yarn treatment at 85℃, whiteness 120, pH 8.9, dyeing with kelanthrene disperse dye at 125℃, 40min, reduction cleaning at 80℃, 20min, dyeing with lyocell / MODAL reactive dyes Yorkshire NBBF0.215%, R3BF0.3%, Y3RF0.6%, sodium sulfate 25g / L, soda ash 10g / L, 60℃, 40min, drying after dyeing into tight bobbin, weft yarn for standby use.

[0060] The warp beam is sizing with a starch-acrylic mixed sizing agent, the sizing agent is 80wt.% of AS-1 high-performance deformed starch from Hefei Runli, 15wt.% of QB-918J acrylic acid from Qingdao Jimo, 5.0wt.% of SLMO-02A wax flakes from Kunshan Mingjia, and the mass ratio of sizing agent to water is 10:90; the pH value of the sizing agent is 6.0, the hairiness is docile, the enhancement is 15%, and the wear resistance improvement rate is 220%;

[0061] The finishing singeing process adopts front and back singeing, light burning (1# burner, flame intensity 10 mbar), and the speed is 100m / min;

[0062] Loose water washing and desizing, temperature 90℃, speed 40m / min, drying at 110℃;

[0063] 185℃ dry setting, speed 40m / min;

[0064] Using Lurui Fine Chemicals Raycare CR-E resin 100g / L, Archroma Chemicals CERANINE HDP LIQ fiber protectant 20g / L, baking temperature 150℃;

[0065] Stretching and pre-shrinking: The working fluid for stretching is silicone oil softener SMI-60 (Zibo Lurui Fine Chemical Co., Ltd.), pH value 5, drying room temperature 110℃, vehicle speed 60m / min; the maximum processing temperature for pre-shrinking is 120℃, vehicle speed 50m / min, to obtain the finished fabric.

[0066] Fabric Weave:2 / 1.

[0067] Comparative Example 1

[0068] Cotton 50S (H400 / 30D+Spandex 30D)

[0069] Same as Example 1, except that the two yarns in the yarn core are not reversely twisted, and the staple fiber strands do not participate in the winding of the yarn in the form of multiple strands;

[0070] Production of outer skin short fiber: select SUPIMA cotton, balance in cotton bale balancing room for 24 hours, cotton bale - cleaning and combing - pre-drawing - striping and winding - combing - drawing - roving - spun yarn.

[0071] Yarn core: Spandex 30D with a stretch ratio of 3.2 and T400-30D are respectively input into the covering spinning system through two tension systems;

[0072] The staple fiber strands are output from the front roller of the spun yarn and wrapped and twisted with two yarn cores to form 50S (H400-30D + spandex 30D) yarn. The final yarn twist coefficient is 490. If the same twist coefficient of 300 is used as in Example 1, please unify the twist coefficient. The friction between the staple fiber and the yarn core is low and normal production cannot be achieved.

[0073] Comparative Example 2

[0074] 60%LYOCELL / 40%MODAL50(SSY / 30D+Spandex 30D)

[0075] Sheath short fiber production: LYOCELL fiber specific resistance 2.03*10 8 , MODAL specific resistance 3.02*10 8 The two fibers were balanced in the raw material balance room for 24 hours (balance room temperature 22℃~24℃, relative humidity 50%~55%), and the fiber specific resistance after balance was <10 7 , and then the disc packing production is carried out, and the temperature and humidity of the cleaning and combing process are controlled: temperature ≥ 22℃, relative humidity 46% ~ 60%.

[0076] Blowing-carding-pre-drawing-drawing first pass-drawing second pass-roving, the roving weight is 4.7g / 10m.

[0077] Yarn core production: Spandex yarn 30D with a stretch ratio of 3.2 and T400-30D are respectively input into the covering spinning system through two tension systems.

[0078] The staple fiber strands are output from the front roller of the spun yarn and wrapped and twisted with two yarn cores to make 60% LYOCELL 40% MODAL 50S (T400-30D + spandex 30D) yarn. The final twist coefficient of the yarn is 490. If the same twist coefficient of 320 as in Example 2 is used, the friction between the staple fiber and the yarn core is low and normal production cannot be achieved.

[0079] Comparative Example 3

[0080] 60% LYOCELL 40% MODAL 50 (SSY / 30D + spandex 30D) is processed by the following processes and produced by yarn-dyed weaving:

[0081] Warp yarn: The original yarn was whole, and the pretreatment was treated with chelating agent Raytexil SQ-B0.3g / L, refining agent SA-E0.8g / L of Lurui Fine Chemicals, and hydrogen peroxide 15g / L, the initial temperature was 40℃, the heating rate was 2℃ / min, and the yarn was treated at 85℃, the whiteness was 120, and the pH was 8.9. Dyeing: Colaine disperse dye NBSWF0.25%, RSWF0.115%, YSWF0.75%, soda ash Na2CO3 3g / L, 125℃, 40min dyeing, 80℃, 20min reduction cleaning; Lyocell / MODAL reactive dye Yorkshire NBBF0.215%, R3BF0.3%, Y3RF0.6%, 25g / L sodium sulfate, 10g / L soda ash, 60℃, 40min dyeing, and drying after dyeing.

[0082] Weft yarn: loose bobbin at 125℃, 20min boiling and setting, pre-treatment with chelating agent 0.3g / L, Lurui Fine Chemicals' refining agent SA-E0.8g / L, hydrogen peroxide 15g / L, initial temperature 40℃, heating rate 2℃ / min, yarn treatment at 85℃, whiteness 120, pH 8.9, dyeing with kelanthrene disperse dye at 125℃, 40min, reduction cleaning at 80℃, 20min, dyeing with lyocell / MODAL reactive dyes Yorkshire NBBF0.215%, R3BF0.3%, Y3RF0.6%, sodium sulfate 25g / L, soda ash 10g / L, 60℃, 40min, drying after dyeing into tight bobbin, weft yarn for standby use.

[0083] The warp beam is sizing with a starch-acrylic mixed sizing agent, the sizing agent is 80wt.% of AS-1 high-performance deformed starch from Hefei Runli, 15wt.% of QB-918J acrylic acid from Qingdao Jimo, 5.0wt.% of SLMO-02A wax flakes from Kunshan Mingjia, and the mass ratio of sizing agent to water is 10:90; the pH value of the sizing agent is 6.0, the hairiness is docile, the enhancement is 15%, and the wear resistance improvement rate is 220%;

[0084] The finishing singeing process adopts front and back singeing, light burning (1# burner, flame intensity 10 mbar), and the speed is 100m / min;

[0085] Loose water washing and desizing, temperature 90℃, speed 40m / min, drying at 110℃;

[0086] 185℃ dry setting, speed 40m / min;

[0087] Using Lurui Fine Chemicals Raycare CR-E resin 100g / L, Archroma Chemicals CERANINE HDP LIQ fiber protectant 20g / L, baking temperature 150℃;

[0088] Stretching and pre-shrinking: The working fluid for stretching is silicone oil softener SMI-60 (Zibo Lurui Fine Chemical Co., Ltd.), pH value 5, drying room temperature 110℃, vehicle speed 60m / min; the maximum processing temperature for pre-shrinking is 120℃, vehicle speed 50m / min, to obtain the finished fabric.

[0089] Fabric Weave:2 / 1.

[0090] The yarns of the above embodiments and comparative examples were compared in terms of yarn indexes. The testing instruments used were Uster UT4, Uster HL400, CLASSIMAT5, the test results are shown in Table 1 below:

[0091] Table 1 Yarn testing results

[0092]

[0093] From the test data of the embodiments and comparative examples in the above table, it can be seen that the yarn evenness, thickness, neps, yarn defects and 3mm hairiness of the yarn prepared by the present invention are significantly improved, especially the 3mm hairiness is reduced by more than 30% when the twist is reduced, and the yarn hairiness is reduced by nearly 50%. The twist coefficient of comparative examples 1 and 2 is much higher than that of the present patent technology to meet the normal yarn production, while the hairiness and other indicators are more than the hairiness of the yarn spun by the present patent technology, which fully reflects the advanced nature of the present patent technology.

[0094] The fabric examples and comparative examples were tested, wherein the fabric pilling test method was GB / T4802.1-2008, and the test results are shown in Table 2 below:

[0095] Table 2 Fabric test results

[0096]

[0097] The judging criteria for the 100-meter race are:

[0098] 4-point scoring standard:

[0099] Defect size: <3in: 1 point; 3in~6in: 2 points; 6in~9in: 3 points; above 9in: 4 points; all holes: 4 points.

[0100] It can be seen from the test data of the above surface material embodiments and comparative examples that the fabric made of the yarn prepared by the present invention has improved surface smoothness, softness, and high-grade texture.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. Those skilled in the art should understand that modifications or equivalent replacements made to the technical solution of the present invention without departing from the scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a smooth and soft elastic yarn, It is characterized in that The outer sheath staple fibers of the yarn are one or a blend of natural fibers and chemical fibers, and the outer sheath staple fibers are made into roving through a pre-spinning process; the yarn core is a composite yarn of two or more of polyester fibers, modified polyester fibers, polyamide, spandex, and polyolefin; the yarn core is reversely twisted to participate in core-wrapping production, and the twist coefficient of the yarn is between 270 and 470.

2. The method for preparing the smooth and soft elastic yarn according to claim 1, It is characterized in that The natural fibers include cotton, flax, and animal fibers. The pre-processing procedure of the outer skin short fibers is as follows: the fibers are balanced in a room satisfying the conditions of a temperature of 22° C. to 28° C. and a relative humidity of 45% to 60%.

3. The method for preparing the smooth and soft elastic yarn according to claim 2, It is characterized in that The pre-spinning process of producing roving of pure cotton staple fiber using cotton as raw material is as follows: the cotton fiber is pre-spinned after the process of cleaning-combing-pre-drawing-strip and rolling-combing-drawing-roving; the weight specification of the small roll in the combing process is 50-70g / m, the top comb needle tooth density is 30-35T / in, the total number of needle teeth of the cylinder is controlled at 37000-49000, and finally the fiber content of the combed sliver below 18mm fed into the drawing process machine after the drawing process is satisfied to be below 5.0%; The pre-spinning process of the blended spinning of cotton and flax short fibers to produce roving is as follows: after the flax fibers are pre-treated, the combed cotton web is mixed in a disc, the fiber mixing times are 2 to 3 times, and the mixed cotton layer is respectively passed through a cotton opener, a roll, a carding machine, a pre-drawing, a drawing, and roving to complete the pre-spinning; The pre-spinning process for producing coarse yarn by blending cotton and wool staple fibers is as follows: the wool blended with cotton is mixed in the drawing process in the pre-spinning process of producing coarse yarn by pure cotton staple fibers, the quantitative unevenness CV% of the mixed wool strips is controlled within 2.0%, the wool particles in the wool strips are controlled within ≤3 particles / g, the oil content of the wool is ≤1.0%, and the moisture regain is controlled within 10% to 16%.

4. The method for preparing the smooth and soft stretch yarn according to claim 1, It is characterized in that The pre-spinning process of producing roving of the chemical fiber is as follows: Blowing and carding - pre-drawing - first drawing - second drawing - roving; The chemical fibers include: synthetic fibers, blended fibers of synthetic fibers and regenerated cellulose fibers or regenerated cellulose ester fibers; Temperature and humidity control in the cleaning and combing process: temperature ≥ 22°C, relative humidity 46% to 60%, fiber specific resistance < 10 7 .

5. The method for preparing the smooth and soft elastic yarn according to claim 1, It is characterized in that The weight of the yarn core accounts for 5% to 40% of the total weight of the yarn.

6. The method for preparing the smooth and soft elastic yarn according to claim 1, It is characterized in that The yarn core is a composite twist of one of polyester fiber, modified polyester fiber or polyamide and one of spandex and superelastic polyolefin, and the stretching ratio is 1-5.

0.

7. The method for preparing the smooth and soft elastic yarn according to claim 1, It is characterized in that The roving passes through the rear roller, the middle roller, the front roller in sequence, and then passes through the lower combing roller added between the front roller and the output roller, so that the staple fiber strands are in a multi-strand form after coming out of the output roller and participate in the twisting and winding of the yarn.

8. The method for preparing the smooth and soft stretch yarn according to claim 1, It is characterized in that In the core-wrapping production process, the height of the yarn guide hook is adjusted to control the height from the output roller to the yarn guide hook to be 20 mm-40 mm.

9. A smooth, soft and stretchy yarn. It is characterized in that The method is prepared by any one of claims 1 to 8.

10. An application of the smooth and soft elastic yarn according to claim 9, It is characterized in that Used to prepare stretch fabrics for yarn-dyed and piece-dyed shirts; the process is shown in Figure 2.

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