Production method of high elastic polyester-cotton-spandex core-spun yarn

Abstract

This invention belongs to the field of textile dyeing technology, specifically relating to a method for producing high-elasticity polyester-cotton-spandex core-spun yarn. The method for producing high-elasticity polyester-cotton-spandex core-spun yarn according to this invention includes the following steps: (1) loose winding: dyeing the yarn using an improved loose winding bobbin; (2) pretreatment; (3) dyeing; (4) post-treatment; (5) dehydration and drying to obtain high-elasticity polyester-cotton-spandex core-spun yarn. The method for producing high-elasticity polyester-cotton-spandex core-spun yarn provided by this invention has high production efficiency, low process loss, maintains high yarn elasticity, and ensures uniform elasticity, color, and fastness of the inner and outer layers, meeting the elasticity requirements of dyed polyester-cotton-spandex core-spun yarn for yarn-dyed fabrics. Furthermore, the low-temperature pretreatment, non-reduction cleaning, and radio frequency drying processes during dyeing result in a short process flow and low energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of textile dyeing technology, specifically relating to a method for producing high-elasticity polyester-cotton-spandex core-spun yarn. Background Technology

[0002] Polyester-cotton blended yarn is made by blending polyester and cotton fibers in a certain proportion. Textiles woven from polyester-cotton blended yarn are commonly known as "Dacron," which combines the style of polyester with the advantages of cotton fabrics. It exhibits good elasticity and abrasion resistance in both dry and wet conditions, maintains dimensional stability, and has low shrinkage. It is also crisp, wrinkle-resistant, easy to wash, and quick-drying, making it popular with consumers. As people's living standards improve, comfortable, form-fitting, and stylish elastic fabrics are receiving increasing attention from consumers. Polyester-cotton spandex core-spun elastic fabric not only possesses the crispness, wrinkle resistance, easy washing, and quick-drying properties of polyester and cotton fabrics, but the elasticity of spandex also provides the fabric with higher wearing comfort and shape retention. Meanwhile, the continuous development of functional polyester, blending cooling polyester, moisture-wicking and quick-drying polyester with cotton and adding elasticity, can further improve the comfort and added value of the fabric.

[0003] For yarn-dyed fabrics, the yarns need to be dyed before weaving. The warp yarns typically use a beam dyeing process, while the weft yarns require a spring tube + covert yarn dyeing method to ensure uniformity in yarn elasticity, inner and outer elasticity, color, and fastness. Using conventional cone yarn dyeing methods results in a post-dyeing elastic elongation of only 2%-3%, far below the elasticity requirements for yarn-dyed elastic fabrics (generally requiring an elastic elongation of no less than 15%). Furthermore, the uniformity of color and fastness between the inner and outer layers of the cone yarn cannot be guaranteed, and problems such as dye accumulation are easily encountered. The reasons are: firstly, when using conventional cone yarn dyeing, the yarn is under high tension, resulting in strong shrinkage during the dyeing process, leading to insufficient flow and differences in color and fastness between the inner and outer layers, while also damaging the elasticity of the spandex yarn; secondly, polyester requires high-temperature, high-pressure dyeing with disperse dyes, which damages its elasticity; and thirdly, the polyester-cotton composition requires pre-treatment with bleaching and a two-bath dyeing process, a lengthy process that further exacerbates the damage to the yarn's elasticity.

[0004] While dyeing using spring tubes and bread yarn can solve the problems of elasticity damage and uniformity inside and outside the dyeing bobbin, this production method results in low winding and yarn loading / unloading efficiency, with each bobbin weighing only about 0.5 kg, low dyeing machine loading rate, and easy damage during the dyeing process, leading to an increase in defective yarn. At the same time, the yarn elasticity is too high after dyeing, requiring high-temperature dry setting of the fabric during the finishing process to ensure width and shrinkage stability, resulting in wasted process costs.

[0005] Therefore, ensuring high production efficiency while maintaining high elastic elongation of the dyed yarn, and ensuring uniform elasticity, color, and fastness of the inner and outer layers, is a challenge for the application of polyester-cotton spandex core-spun yarn in the production of yarn-dyed elastic fabrics.

[0006] CN104313901A discloses a method for dyeing pure cotton cone yarn. In the auxiliary agent application process, the oiling device on an SSM loose winding machine is used to evenly apply mixed auxiliaries to the pure cotton yarn, while simultaneously winding it into loose cone yarn for dyeing. Reactive dyes are used for cone yarn dyeing, and the loose cone yarn is dyed in a cone yarn dyeing machine without pretreatment; it is directly dyed using conventional methods followed by normal post-treatment. Finally, it is conventionally dried, dehydrated, and then radio frequency dried, with the conveyor belt speed at 5 meters per hour. The method results in minimal damage to yarn strength and high yarn strength. Firstly, while this method eliminates the need for pretreatment and reduces damage to yarn strength, the untreated cotton fibers retain waxes and pectins that affect water absorption, thus hindering dye penetration and diffusion. Although the addition of cationic auxiliaries allows reactive dye anions in the dye bath to adhere to the fibers through adsorption, forming ionic bonds, this often results in surface dyeing. Furthermore, the strength of ionic bonds is weaker than covalent bonds, leading to a lower fastness rating compared to conventional reactive dyes. Secondly, the cationic auxiliaries on the cotton fiber surface adsorb reactive dye anions in the dye bath, causing rapid dyeing but hindering even and thorough dyeing, increasing the difficulty of controlling the difference between the inner and outer layers of the yarn. Thirdly, without pretreatment of the cotton fibers, the yarn has low whiteness, making it unsuitable for light and bright colors. Fourthly, loose-winding machines require an oiling device, which most dyeing plants lack, limiting their application.

[0007] CN102733207A discloses a dyeing method for polyester-cotton blended elastic yarn used as packaged yarn, including loose winding, pretreatment, polyester dyeing, reduction washing, cotton dyeing, posttreatment, dehydration, and drying. The loosely wound packages have a fixed weight of 0.6-1.2 kg / piece and a density of 0.28-0.42 g / cm³. 3After winding, the yarn enters the dyeing process. Polyester dyeing uses low-temperature disperse dyes at 100℃-128℃ for 15-60 minutes, followed by reduction washing, cotton dyeing, post-treatment, dehydration, and drying. After dyeing, the color and elasticity of the yarn package are consistent inside and out, with a high success rate in one pass, avoiding problems associated with traditional dyeing methods. However, this method uses low-temperature or medium-temperature disperse dyes for polyester dyeing, which are unsuitable for high-temperature or high-wash-fastness disperse dyes. This is because high-temperature and high-wash-fastness disperse dyes have larger molecular weights, making them difficult to dye evenly and ensuring uniformity. Therefore, it is not suitable for dark colors, extra-dark colors, or yarns requiring high wash fastness. CN1793475A also discloses a yarn package dyeing process for elastic yarns, including a loose winding process, a pre-treatment process, a dyeing process, a post-treatment process, a dehydration process, and a drying process. Its characteristic is that the raw yarn undergoes one or two pre-shrinking and setting treatments before the loose winding process. This is achieved by using steam to slowly and evenly shrink the elastic yarn during a temperature rise process from low to high under vacuum conditions, resulting in a consistent pre-shrinking and setting effect across the inner, middle, and outer layers. This method is suitable for varieties such as cotton-covered spandex and regenerated cellulose-covered spandex, where high temperature and high pressure are not required during dyeing. However, polyester-cotton-spandex core-spun yarn requires high temperature and high pressure dyeing during the polyester dyeing process, which damages its elasticity. If additional pre-shrinking and setting treatment is performed before dyeing, the yarn elasticity will be low. After pre-shrinking and setting treatment, and then proceeding with pre-treatment, dyeing, post-treatment, dehydration, and drying processes, the final yarn elasticity is only 2%-4%, failing to meet the requirements for elastic fabrics.

[0008] CN104499308A discloses a method for dyeing polyester-cotton fiber packaged yarn with vat dyes. This invention includes yarn loosening, dyeing, and post-treatment. Yarn loosening is achieved by digital winding of the blended fiber yarn. Dyeing involves adding disperse dye, a mixed alkali agent, and an oxidizing agent at room temperature, followed by two heating and holding cycles, then direct cooling. Reactive dye and sodium sulfate are then added, and after holding, the residual liquid is directly discharged. The yarn is then heated and held in water, drained, and a certain weight of soaping agent is added for soaping. After holding, the yarn is discharged, washed once with clean water, softened, discharged, dehydrated, and dried in a frequency converter dryer. The yarn is then separated into packages for warping or winding to become the finished yarn. This method significantly reduces the dyeing process of blended fiber packaged yarn, greatly shortening the dyeing time and process. The temperature-controlled dyeing method, through rapid cooling and multiple rapid heating cycles, allows for rapid dye adhesion. The use of various dyeing auxiliaries results in high dyeing efficiency, good cleaning effect, and high color fastness. First, polyester-cotton yarn has almost no elasticity, so there are no issues with shrinkage and elasticity damage like those found in polyester-cotton spandex core-spun yarn during dyeing. Second, the co-dyeing of polyester-cotton with disperse dyes and reactive dyes and the co-dyeing of polyester-cotton with disperse dyes and vat dyes are different process systems. Reactive dyes are easier to control in terms of uniformity and have better color fastness to rubbing than vat dyes. Third, this method requires adding disperse dyes, mixed alkali agents, and oxidants together and then heating, so the disperse dyes need to be alkali-resistant and oxidant-resistant, requiring specific screening of disperse dyes and limiting their application. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a production method for high elasticity polyester-cotton-spandex core-spun yarn. The method has high production efficiency, low process loss, and the yarn maintains high elasticity. The elasticity, color and fastness of the inner and outer layers are uniform, which meets the elasticity requirements of polyester-cotton-spandex core-spun yarn for yarn-dyed fabrics after dyeing. At the same time, the low-temperature pretreatment, reduction-free cleaning and radio frequency drying process in the dyeing process has a short process and low energy consumption.

[0010] The method for producing high-elasticity polyester-cotton-spandex core-spun yarn according to the present invention includes the following steps:

[0011] (1) Loose winding:

[0012] An improved loose-bore dyeing method is used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn is rewinded on a loose-bore winding machine, resulting in a package weight of 0.7-0.8 kg and a packaged yarn density of 0.28-0.30 g / cm³. 3 ;

[0013] (2) Pre-processing:

[0014] After fixing the yarn cones on the yarn rack, suspend them in the dyeing vat. Add warm water and mixed auxiliaries, circulate for 5-10 minutes, then reflux and add hydrogen peroxide. Raise the temperature to 70-85℃ at 2-2.5℃ / min and maintain for 40-50 minutes before draining. After adding warm water, raise the temperature to 55-60℃ and maintain for 7-10 minutes before draining. After adding room temperature water, add deoxygenating enzymes and neutralizing acids, raise the temperature to 50-55℃, maintain for 15-20 minutes, and then drain.

[0015] (3) Staining:

[0016] Add warm water and dispersing and leveling agent, adjust the pH to 4-5 with acid, then add disperse dye and heat to 115-125℃ at a rate of 0.8-1℃ / min, hold for 30-50 minutes, then drain. Add warm water and heat to 70-80℃, hold for 7-10 minutes, then drain. Add room temperature water and add 10-80 g / L sodium sulfate to the main tank, hold for 5-10 minutes, then add 1-2 g / L leveling agent LARLR and reactive dye to the main tank, hold for 10-20 minutes, then heat to 60-90℃ at a rate of 1-1.5℃ / min, hold for 10-20 minutes, add 10-25 g / L soda ash to the main tank over 20-30 minutes, hold for 40-60 minutes, then drain. Add warm water and heat to 55-60℃, hold for 7-10 minutes, then drain.

[0017] (4) Post-processing:

[0018] First, add hot water to the main tank, then add 1-2 g / L of non-reducing cleaning soap detergent GIN, heat to 95-100℃ and keep warm for 15-20 minutes before draining; after soaping, rinse with warm water for 10-20 minutes and then drain.

[0019] (5) Dehydration and drying:

[0020] The yarn packages are suspended into a hot air dryer for dehydration and drying, with a drying pressure of 5.5-6 kg / cm². 2 The heating outlet temperature is 105℃-110℃, the drying time is 40-50 minutes, and after drying, the yarn is lifted out to balance, resulting in high-elasticity polyester-cotton-spandex core-spun yarn.

[0021] The yarn package in step (1) is cylindrical, and the density deviation of a single batch of yarn packages is ±0.02 g / cm³. 3 Within.

[0022] Step (1) The improved loose bobbin is made by sealing and fixing both ends of the disposable bobbin and the spring tube together with a sealing ring. The stroke of the loose bobbin is 136mm or 142mm, the diameter of the disposable bobbin is 56-64mm, the height of the spring tube is the same as that of the disposable bobbin, and the diameter of the spring tube is 72-80mm.

[0023] The mixed additives in step (2) are stabilizer SED 0.5-1g / L, low temperature refining agent NLP 1-2g / L, caustic soda 2-3g / L, and caustic soda with a Baume degree of 48.

[0024] In step (2), the amount of deoxygenase EZ-B is 0.15-0.2 g / L, and the amount of neutralizing acid PH-N is 0.7-0.9 g / L.

[0025] The bath ratio in step (2) is 1:10-20.

[0026] The dispersing and leveling agent in step (3) is DL-PL with a concentration of 1-2 g / L.

[0027] The dyeing machine pump speed in step (3) is 75-85%.

[0028] In step (4), the disperse dye is either an SE type dye or an S type dye, and the reactive dye is either a medium-temperature type or a high-temperature type reactive dye.

[0029] The normal temperature for water is 20-30℃, the warm temperature for water is 45-55℃, and the hot temperature for water is 80-90℃.

[0030] Specifically, the production method of the aforementioned high-elasticity polyester-cotton-spandex core-spun yarn includes the following steps:

[0031] (1) Loose winding:

[0032] An improved loose-bore dyeing method is used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn is rewinded on a loose-bore winding machine, resulting in a package weight of 0.7-0.8 kg and a packaged yarn density of 0.28-0.30 g / cm³. 3 The yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02 g / cm³. 3 Within; the improved loose-type bobbin is made by sealing and fixing both ends of a disposable bobbin and a spring tube together with a sealing ring. The stroke of the loose-type bobbin is 136mm or 142mm, the diameter of the disposable bobbin is 56-64mm, the height of the spring tube is the same as that of the disposable bobbin, and the diameter of the spring tube is 72-80mm.

[0033] (2) Pre-processing:

[0034] After fixing the yarn cones on the yarn rack, suspend them in the dyeing vat. Add warm water at a liquor ratio of 1:10-20, and add stabilizer SED 0.5-1 g / L, low-temperature refining agent NLP 1-2 g / L, and caustic soda (48 Baume degrees) 2-3 g / L. Circulate for 5-10 minutes, then reflux and add hydrogen peroxide (27.5 wt.%) 6-8 g / L. Increase the temperature to 70-85℃ at 2-2.5℃ / min and maintain for 40-50 minutes before draining. After adding warm water, increase the temperature to 55-60℃ and maintain for 7-10 minutes before draining. After adding room temperature water, add deoxygenase EZ-B 0.15-0.2 g / L and neutralizing acid PH-N 0.7-0.9 g / L, increase the temperature to 50-55℃, maintain for 15-20 minutes, and then drain.

[0035] (3) Staining:

[0036] Add warm water at a liquor ratio of 1:10.7-1:13.3, maintain the dyeing machine pump speed at 75-85%, and add 1-2 g / L of dispersing and leveling agent DL-PL. Adjust the pH to 4-5 with acid, then add disperse dye and heat to 115-125℃ at a rate of 0.8-1℃ / min, hold for 30-50 minutes, and then drain the liquid. Add warm water and heat to 70-80℃, hold for 7-10 minutes, and then drain the liquid. Add room temperature water and add 10-80 g / L of sodium sulfate to the main tank, hold for 5-10 minutes, and then add leveling agent LARLR to the main tank. Add 1-2 g / L of reactive dye to the main tank, keep warm for 10-20 min, then heat to 60-90℃ at a rate of 1-1.5℃ / min and hold for 10-20 min. Add 10-25 g / L of soda ash to the main tank, completing the addition in 20-30 min, keep warm for 40-60 min, and then drain the liquid. Add warm water, heat to 55-60℃ and hold for 7-10 min, then drain the liquid.

[0037] (4) Post-processing:

[0038] First, add hot water to the main tank, then add 1-2 g / L of GIN non-reducing cleaning soaping agent. Heat the tank to 95-100℃ and keep it at that temperature for 15-20 minutes before draining. After soaping, rinse with warm water for 10-20 minutes and then drain. Depending on the concentration of disperse dyes and reactive dyes, choose one, two, or multiple soaping cycles.

[0039] (5) Dehydration and drying:

[0040] The yarn packages are suspended into a hot air dryer for dehydration and drying. The dehydration time is 5 minutes, and the drying pressure is 5.5-6 kg / cm². 2 The heating outlet temperature is 105℃-110℃, the drying time is 40-50 minutes, and after drying, the yarn is lifted out to balance, resulting in high-elasticity polyester-cotton-spandex core-spun yarn.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] (1) The production method of high elastic polyester-cotton-spandex core-spun yarn of the present invention, compared with conventional core-spun yarn dyed with polyester-cotton-spandex, results in higher elasticity of the yarn after dyeing, and more uniform elasticity, color and fastness inside and outside. The elastic elongation rate of conventional core-spun yarn after dyeing is only 2%-3%, which easily leads to dye accumulation and large color deviation between the inside, middle and outside. The elastic elongation rate of the yarn after dyeing by the method of the present invention is between 15%-20%, the elasticity deviation between the inside, middle and outside yarn is within 5%, the color deviation is above grade 4, and the fastness deviation is within grade 0.5.

[0043] (2) The production method of high elastic polyester-cotton-spandex core-spun yarn of the present invention has higher production efficiency, higher dyeing machine loading rate, and better production stability compared with the dyeing method of spring tube + bread yarn. It can be rewinding with a conventional loose winding machine without the need for special investment in bread machine. The efficiency of loose winding of spring tube + bread yarn is 40-50%. During dyeing, due to the small weight of the yarn, the dyeing machine loading rate is only 50%-55%, and the dyeing bath ratio of 1:15-23 is smaller than the conventional dyeing bath ratio (1:8-15), which cannot guarantee reproducibility. However, the loose winding efficiency of the method described in the present invention is 75-78%, the dyeing machine loading rate is 70-80% during dyeing, and the dyeing bath ratio is 1:10-18, which is significantly reduced and the dyeing is more stable.

[0044] (3) The production method of the high elastic polyester-cotton-spandex core-spun yarn of the present invention can produce yarn that meets the elasticity requirements of the yarn for yarn in yarn-dyed low elastic fabrics, and the fabric does not need to be dry-set at high temperature during the finishing process. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the improved loose bobbin of the present invention.

[0046] In the diagram: 1. Disposable tube; 2. Spring tube. Detailed Implementation

[0047] The present invention will be further described below with reference to specific embodiments.

[0048] The improved loose bobbin used in the following embodiments, such as Figure 1 As shown, the disposable tube 1 and the spring tube sleeve 2 are joined together and sealed and fixed at both ends with sealing rings. The loose tube has a stroke of 136mm and a diameter of 60mm. The spring tube has the same height as the disposable tube and a diameter of 75mm. The disposable tube is a resin tube.

[0049] The additives used in the following examples and comparative examples are all commercially available products. The room temperature water temperature in each example and comparative example is 20-30°C, the warm water temperature is 45-55°C, and the hot water temperature is 80-90°C. These are all routine operations and are therefore not further limited.

[0050] Example 1

[0051] The yarn specification is 45Ne 60% American short-staple cotton / 40% polyester spandex core-spun yarn, and the spandex filament is 40D. The production method includes the following steps:

[0052] (1) Loose winding:

[0053] An improved loose-bore dyeing method was used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn was rewinded on a loose-bore winding machine, resulting in a package weight of 0.75 kg and a package density of 0.28 g / cm³. 3 The number of yarn cones is 23, and the yarn cones are regular cylinders. The density deviation of a single batch of yarn cones is ±0.02g / cm³. 3 Within.

[0054] (2) Pre-processing:

[0055] After fixing the yarn cones on the yarn rack, suspend them in a 30kg dyeing vat with warm water at a liquor ratio of 1:17.4. Add 1g / L of stabilizer SED, 1.5g / L of low-temperature refining agent NLP, and 3g / L of caustic soda (48 Baume). Circulate for 5 minutes, then reflux and add 8g / L of hydrogen peroxide (27.5wt.%). Increase the temperature to 85℃ at 2℃ / min and maintain for 50 minutes before draining. After adding warm water, increase the temperature to 60℃ and maintain for 10 minutes before draining. After adding room temperature water, add 0.2g / L of deoxygenase EZ-B and 0.9g / L of neutralizing acid PH-N. Increase the temperature to 50℃ and maintain for 20 minutes before draining.

[0056] (3) Staining:

[0057] Add warm water at a liquor ratio of 1:17.4, set the dyeing machine pump speed to 75%, and add 1 g / L of dispersing and leveling agent DL-PL to the main tank. Adjust the pH to 4.6 with acid, then add 0.21% Blue SE-RPD, 0.078% Red SE-RPD, and 0.012% Yellow SE-RPD. Heat to 115℃ at a rate of 1℃ / min and hold for 30 minutes, then drain the liquid. Add warm water and heat to 70℃ and hold for 7 minutes, then drain the liquid. Add room temperature water and add 10 g / L of sodium sulfate to the main tank. Hold for 5 minutes, then add 1 g / L of leveling agent LARLR and 0.18% Blue K-HL, 0.073% Red K-3BS, and Yellow SE-RPD to the main tank. K-3RS 0.015%, hold at temperature for 10 min, then heat to 60℃ at a rate of 1℃ / min and hold for 20 min. Add 10 g / L of soda ash to the main tank, complete the addition in 20 min, hold at temperature for 40 min, and then drain. Add warm water, heat to 60℃ and hold for 7 min, and then drain.

[0058] (4) Post-processing:

[0059] First, add hot water to the main tank at a bath ratio of 1:17.4, then add 1g / L of GIN non-reducing cleaning soap, heat to 90℃ and keep warm for 15 minutes before draining; after soaping, add warm water, rinse for 10 minutes, and then drain.

[0060] (5) Dehydration and drying:

[0061] The yarn packages are suspended into a hot air dryer for dehydration and drying. The dehydration time is 5 minutes, and the drying pressure is 5.5 kg / cm². 2 The heating outlet temperature is 110℃, the drying time is 50 minutes, and after drying, the yarn is lifted out to balance, resulting in high-elasticity polyester-cotton-spandex core-spun yarn.

[0062] Example 2

[0063] The yarn specification is 45Ne 70% SUPIMA / 30% MICAX spandex core-spun yarn, the spandex yarn is 40D, and MICAX is a polyester-based cooling fiber. The process method includes the following steps:

[0064] (1) Loose winding:

[0065] An improved loose-bore dyeing method was used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn was rewinded on a loose-bore winding machine, resulting in a package weight of 0.7 kg and a yarn density of 0.29 g / cm³. 3 The number of yarn cones is 60; the yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02g / cm³. 3 Within.

[0066] (2) Pre-processing:

[0067] After fixing the yarn cones on the yarn rack, suspend them in a 70kg dyeing vat with warm water at a liquor ratio of 1:10.9. Add 0.5g / L of stabilizer SED, 1g / L of low-temperature refining agent NLP, and 2.5g / L of caustic soda (48 Baume). After circulating for 8 minutes, reflux and add 6g / L of hydrogen peroxide (27.5wt.%). Increase the temperature to 85℃ at 2.5℃ / min and maintain for 40 minutes before draining. After adding warm water, increase the temperature to 55℃ and maintain for 7 minutes before draining. After adding room temperature water, add 0.18g / L of deoxygenase EZ-B and 0.7g / L of neutralizing acid PH-N. Increase the temperature to 50℃ and maintain for 15 minutes before draining.

[0068] (3) Staining:

[0069] Add warm water at a liquor ratio of 1:10.9, set the dyeing machine pump speed to 80%, and add 2 g / L of dispersing and leveling agent DL-PL to the main tank. Adjust the pH to 4 with acid, then add 1.0% Navy Blue S-WF, 0.163% Red S-WF, and 0.28% Yellow S-WF disperse dyes. Increase the temperature to 120℃ at a rate of 0.8℃ / min and maintain for 50 minutes, then drain the solution. Add warm water and heat to 80℃, maintain for 10 minutes, then drain the solution. Add room temperature water and add 80 g / L of sodium sulfate to the main tank, maintain for 10 minutes, then add 2 g / L of leveling agent LARLR and reactive dyes Drimaren Navy X-GN 3.15%, Drimaren Red X-6BN 0.94%, and Drimaren Yellow X-4RN to the main tank. 0.68%, keep warm for 20 minutes, then heat to 90℃ at a rate of 1℃ / min and keep warm for 20 minutes. Add 20g / L of soda ash to the main tank, and finish adding it in 30 minutes. Keep warm for 60 minutes and then drain the liquid. Add warm water, heat to 60℃ and keep warm for 10 minutes and then drain the liquid.

[0070] (4) Post-processing:

[0071] First, add hot water to the main tank at a bath ratio of 1:10.9, then add 2g / L of GIN non-reducing cleaning soap, heat to 98℃ and keep warm for 20 minutes before draining; after three soaping cycles, add warm water, rinse for 10 minutes, and then drain.

[0072] (5) Dehydration and drying:

[0073] The yarn packages are suspended into a hot air dryer for dehydration and drying. The dehydration time is 5 minutes, and the drying pressure is 5.5 kg / cm². 2 The heating outlet temperature is 110℃, the drying time is 50 minutes, and after drying, the yarn is lifted out to balance, resulting in high-elasticity polyester-cotton-spandex core-spun yarn.

[0074] Example 3

[0075] The yarn specification is 45Ne 60% American short-staple cotton / 40% polyester spandex core-spun yarn, and the spandex filament is 40D. The production method of the aforementioned high-elasticity polyester-cotton-spandex core-spun yarn includes the following steps:

[0076] (1) Loose winding:

[0077] An improved loose-bore dyeing method was used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn was rewinded on a loose-bore winding machine, resulting in a package weight of 0.8 kg and a package density of 0.30 g / cm³. 3 The number of yarn cones is 92; the yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02g / cm³. 3 Within.

[0078] (2) Pre-processing:

[0079] After fixing the yarn cones on the yarn rack, suspend them in a 140KG dyeing vat with warm water at a liquor ratio of 1:13.6. Add 1g / L of stabilizer SED, 2g / L of low-temperature refining agent NLP, and 2g / L of caustic soda (48 Baume). Circulate for 10 minutes, then reflux and add 7g / L of hydrogen peroxide (27.5wt.%). Increase the temperature to 85℃ at 2℃ / min and maintain for 45 minutes before draining. After adding warm water, increase the temperature to 60℃ and maintain for 8 minutes before draining. After adding room temperature water, add 0.15g / L of deoxygenase EZ-B and 0.8g / L of neutralizing acid PH-N. Increase the temperature to 50℃ and maintain for 18 minutes before draining.

[0080] (3) Staining:

[0081] Add warm water at a liquor ratio of 1:13.6, set the dyeing machine pump speed to 85%, and add 1 g / L of dispersing and leveling agent DL-PL. Adjust the pH to 5 with acid, then add 2.0% of disperse dyes Navy WW-GSN, 0.2% of Red WW-3BS, and 0.5% of Yellow S-WF. Increase the temperature to 125℃ at a rate of 0.9℃ / min and maintain for 40 minutes before draining. Add warm water and increase the temperature to 80℃, maintain for 9 minutes, then drain. Add room temperature water and add 40 g / L of sodium sulfate to the main tank. Maintain for 9 minutes, then add 1.5 g / L of leveling agent LARLR and 3.5% of reactive dyes NAVY H-EXL, Crimson H-EXL, and YELLOW H-EXL to the main tank. Add 0.3%, keep warm for 15 minutes, then heat to 80℃ at a rate of 1.5℃ / min and hold for 10 minutes. Add 25g / L of soda ash to the main tank, and finish adding it over 25 minutes. Keep warm for 50 minutes and then drain the liquid. Add warm water, heat to 60℃ and hold for 8 minutes, then drain the liquid.

[0082] (4) Post-processing:

[0083] First, add hot water to the main tank at a bath ratio of 1:13.6, then add 1g / L of GIN non-reducing cleaning soap, heat to 95℃ and keep warm for 15 minutes before draining; after two soaping cycles, add warm water, rinse for 10 minutes, and then drain.

[0084] (5) Dehydration and drying:

[0085] The yarn packages are suspended into a hot air dryer for dehydration and drying. The dehydration time is 5 minutes, and the drying pressure is 6 kg / cm². 2 The heating outlet temperature is 105℃, the drying time is 40 minutes, and after drying, the yarn is lifted out to balance, resulting in high-elasticity polyester-cotton-spandex core-spun yarn.

[0086] Comparative Example 1

[0087] The yarn specification is 45Ne 60% American short-staple cotton / 40% polyester spandex core-spun yarn, with spandex filament of 40D. The preparation process of using conventional package yarn dyeing of polyester-cotton-spandex core-spun yarn after pre-shrinking and setting is as follows:

[0088] (1) Loose winding:

[0089] The conventional loose-bore dyeing method was used for packaged yarn dyeing: The polyester-cotton-spandex core-spun yarn was turned into packages on a loose-bore winding machine. After turning, the individual weight was 0.94 kg, and the packaged yarn density was 0.38 g / cm³. 3 The number of yarn cones is 10; the yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02g / cm². 3 Within.

[0090] (2) Pre-shrinkage shaping:

[0091] After fixing the yarn cones on the yarn rack, suspend them in a 10kg dyeing vat, add warm water at a liquor ratio of 1:9, heat to 130℃ and maintain for 20 minutes before draining the liquid.

[0092] (3) Dehydrate, dry, and re-pour:

[0093] The yarn packages are suspended into a hot air dryer for dehydration and drying. The dehydration time is 5 minutes, and the drying pressure is 6 kg / cm². 2 The heating outlet temperature is 105℃, the drying time is 40 minutes, and after drying, the yarn is lifted out for balancing and then rewinded on a loose winding machine. The rewinded yarn weighs 0.94 kg, and the yarn density is 0.36 g / cm³. 3 The yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02 g / cm³. 3 Within.

[0094] (3) Pre-processing:

[0095] Add warm water at a bath ratio of 1:9. The pretreatment process and parameters are the same as in Example 3.

[0096] (4) Staining:

[0097] Add warm water at a liquor ratio of 1:9. The dyeing process and parameters are the same as in Example 3.

[0098] (5) Post-processing:

[0099] First, add hot water to the main tank at a bath ratio of 1:9, and then proceed with the same treatment process as in Example 3.

[0100] (6) Dehydration and drying:

[0101] The dehydration and drying process is the same as in Example 3.

[0102] Comparative Example 2

[0103] The yarn specification is 45Ne 70% SUPIMA / 30% MICAX spandex core-spun yarn, the spandex yarn is 40D, and MICAX is a polyester-based cooling fiber. The preparation process of conventional packaged yarn dyed polyester-cotton spandex core-spun yarn is as follows:

[0104] (1) Loose winding:

[0105] The conventional loose-bore dyeing method is used for packaged yarn dyeing: Polyester-cotton-spandex core-spun yarn is rewinded on a loose-bore winding machine, resulting in a package weight of 0.7 kg and a package density of 0.35 g / cm³. 3 The number of yarn cones is 8; the yarn cones are regular cylinders, and the density deviation of a single batch of yarn cones is ±0.02g / cm³. 3 Within.

[0106] (3) Pre-processing:

[0107] After the yarn cones are fixed on the yarn rack, they are suspended into a 10kg dyeing vat with warm water at a liquor ratio of 1:15. The pretreatment process and parameters are the same as in Example 2.

[0108] (4) Staining:

[0109] Add warm water at a liquor ratio of 1:15. The dyeing process and parameters are the same as in Example 2.

[0110] (5) Post-processing:

[0111] First, add hot water to the main tank at a bath ratio of 1:15, and then proceed with the same treatment process as in Example 2.

[0112] (6) Dehydration and drying:

[0113] The dehydration and drying process is the same as in Example 2.

[0114] Comparative Example 3

[0115] The yarn specification is 45Ne 70% SUPIMA / 30% MICAX spandex core-spun yarn, the spandex yarn is 40D, and MICAX is a polyester-based cooling fiber. It uses a spring tube + bread yarn dyeing method. The process is as follows:

[0116] (1) Loose winding:

[0117] The yarn is dyed using a spring tube and bread yarn: Polyester-cotton-spandex core-spun yarn is wound into bread yarn on a high-performance precision cross-winding machine (single-face machine). Each wound weighs 0.5 kg, and the yarn density is 0.16 g / cm³. 3 There are 8 bobbins. After unwinding, the bread yarn is put onto the spring tube.

[0118] (3) Pre-processing:

[0119] After the spun bread yarn is pressed and fixed on the yarn rod of the yarn frame, it is suspended into a 10Kg dyeing vat with warm water at a liquor ratio of 1:21. The pretreatment process and parameters are the same as in Example 2.

[0120] (4) Staining:

[0121] Add warm water at a liquor ratio of 1:21. The dyeing process and parameters are the same as in Example 2.

[0122] (5) Post-processing:

[0123] First, add hot water to the main tank at a bath ratio of 1:21, and then proceed with the same treatment process as in Example 2.

[0124] (6) Dehydration and drying:

[0125] The dehydration and drying process is the same as in Example 2.

[0126] The loose winding efficiency and dyeing machine loading rate in the above embodiments and comparative examples were statistically analyzed. The elastic elongation of the outer, middle and inner layers of the dyed yarn were tested. The color difference between the outer and inner layers of the yarn was tested using the color of the middle layer of the yarn as the standard. The results are shown in Table 1. The rubbing fastness, washing fastness and migration fastness of the outer and inner layers of the yarn were tested. The results are shown in Table 2.

[0127] Table 1

[0128]

[0129]

[0130] The internal control standards for color difference between internal and external colors in Table 1 are as follows: A difference of 0.5 or less (inclusive) is classified as level 4 / 5; a difference between 0.5 and 1.3 (inclusive) is classified as level 4; a difference between 1.3 and 2.1 (inclusive) is classified as level 3 / 4; a difference between 2.1 and 3.0 (inclusive) is classified as level 3; a difference between 3.0 and 4.1 (inclusive) is classified as level 2 / 3; and a difference between 4.1 and 5.6 (inclusive) is classified as level 2. Level 3 and below are considered to have large internal and external color differences and are classified as defective yarn.

[0131] Table 2

[0132]

[0133] Of course, the above description is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the embodiments of the present invention. The present invention is also not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. A method for producing high-elasticity polyester-cotton-spandex core-spun cheese, characterized by: The method comprises the following steps: (1) loose winding: The polyester-cotton-spandex core-spun yarn is dyed by using improved loose bobbin: the polyester-cotton-spandex core-spun yarn is reversed on the loose winder, the weight of the reversed yarn is 0.7-0.8 kg, the density of the bobbin yarn is 0.28-0.30 g / cm 3 ; The improved loose tube is sealed and fixed by sealing rings at both ends after the disposable tube is sleeved with the spring tube, wherein the stroke of the loose tube is 136 mm or 142 mm, the diameter of the disposable tube is 56-64 mm, the height of the spring tube is the same as that of the disposable tube, and the diameter of the spring tube is 72-80 mm; (2) pretreatment: After the cheese is fixed on the creel, it is hung into the dyeing vat, mixed additives are added after entering warm water, and circulation is performed for 5-10 min, then hydrogen peroxide is added by backflow, the temperature is increased to 70-85 DEG C at a rate of 2-2.5 DEG C / min, and the temperature is kept for 40-50 min, then the liquid is discharged; after entering warm water and increasing the temperature to 55-60 DEG C, the temperature is kept for 7-10 min, then the liquid is discharged into normal temperature water, deoxidizing enzyme and neutralizing acid are added, the temperature is increased to 50-55 DEG C, and the temperature is kept for 15-20 min, then the liquid is discharged; (3) dyeing: After entering warm water and adding dispersion leveling agent, the pH is adjusted to 4-5 by adding acid, then disperse dye is added, the temperature is increased to 115-125 DEG C at a rate of 0.8-1 DEG C / min, the temperature is kept for 30-50 min, then the liquid is discharged; after entering warm water and increasing the temperature to 70-80 DEG C, the temperature is kept for 7-10 min, then the liquid is discharged; after entering normal temperature water, sodium sulfate 10-80 g / L is added into the main cylinder, the temperature is kept for 5-10 min, then leveling agent LARLR 1-2 g / L and reactive dye are added into the main cylinder, the temperature is kept for 10-20 min, the temperature is increased to 60-90 DEG C at a rate of 1-1.5 DEG C / min, sodium carbonate 10-25 g / L is added into the main cylinder, the addition is completed in 20-30 min, the temperature is kept for 40-60 min, then the liquid is discharged; after entering warm water, the temperature is increased to 55-60 DEG C, and the temperature is kept for 7-10 min, then the liquid is discharged; (4) post-treatment: Hot water is first added into the main cylinder, then reduction-free cleaning and soaping agent GIN 1-2 g / L is added, the temperature is increased to 95-100 DEG C, the temperature is kept for 15-20 min, then the liquid is discharged; after soaping, the temperature is increased to 70-80 DEG C, the temperature is kept for 10-20 min, then the liquid is discharged; (5) dehydration and drying: The cheese is hung into the hot air dryer to be dehydrated and dried, and the drying pressure is 5.5-6 kg / cm 2 The heating outlet temperature is 105-110℃, the drying time is 40-50 min, and after drying, the balance is hung out to obtain high-elasticity polyester-cotton-spandex core-spun cheese.

2. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The cheese is a cylinder, the single cheese density deviation is ±0.02g / cm 3 within the range.

3. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The mixed additives in step (2) are stabilizer SED 0.5-1 g / L, low-temperature refining agent NLP 1-2 g / L, and caustic soda 2-3 g / L.

4. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The deoxidizing enzyme in step (2) is EZ-B 0.15-0.2 g / L, and the neutralizing acid is PH-N 0.7-0.9 g / L.

5. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The bath ratio in step (2) is 1:10-18.

6. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The dispersion leveling agent in step (3) is DL-PL, and the concentration is 1-2 g / L.

7. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The pump speed of the dyeing machine in step (3) is 75-85%.

8. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The disperse dye in step (3) is one of SE type dye or S type dye, and the reactive dye is one of medium-temperature type or high-temperature type reactive dye.

9. The method of producing high-elasticity polyester-cotton-spandex core-spun cheese as claimed in claim 1, wherein: The temperature of normal temperature water is 20-30 DEG C, the temperature of warm water is 45-55 DEG C, and the temperature of hot water is 80-90 DEG C.

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