Warp beam machine silk brocade elastic fabric dyeing process
By using a combination of specific dyes and leveling agents on a warp beam dyeing machine, the problems of color difference between the inner and outer areas and loss of elasticity of spandex in the dyeing of silk and nylon elastic fabrics have been solved, achieving uniformity in dyeing sensitive colors and high fastness of the fabric.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-04-03
AI Technical Summary
Existing dyeing methods for silk and nylon elastic fabrics on warp beam dyeing machines have problems such as long dyeing time, high temperature leading to loss of elasticity of spandex yarn, color difference between the edge and center of the fabric, and color difference between the inner and outer shades. In particular, the defect rate is high when dyeing sensitive colors.
A dyeing process for warp-bonded nylon elastic fabrics is adopted, which includes silk dyeing, washing, nylon dyeing, washing and soaping, and drying and setting steps. The silk is first dyed with reactive dyes with monochlorotriazine and vinyl sulfone dual reactive groups, combined with neutral dyes and leveling agents. Uniform dyeing is achieved by increasing water pressure and controlling the dyeing speed through fabric feeding.
It achieves uniform dyeing when dyeing sensitive colors on a warp beam dyeing machine, reduces the color difference between the inner dark and the outer light, maintains the elasticity and color fastness of the fabric, and reduces the defect rate.
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Figure SMS_1
Abstract
Description
Technical Field
[0001] A dyeing process for warp beam knitting of elastic silk fabrics, belonging to the field of silk warp beam knitting technology. Background Technology
[0002] Silky nylon elastic fabric is a fabric woven from nylon yarn and silk yarn. The nylon yarn contains spandex filaments, providing elasticity. Typically, long-filament silk yarn is used as the warp, and yarns obtained by covering and spinning nylon and spandex elastic fibers are used as the weft. Due to the different materials of nylon and silk yarns, the dyeing conditions differ significantly, usually requiring a two-bath dyeing method using a roller dyeing machine.
[0003] The applicant discovered the following problems with the existing dyeing of silk and nylon elastic fabrics during the research: First, existing dyeing methods using roll dyeing machines involve long dyeing times and high dyeing temperatures, which can easily lead to loss of elasticity in the spandex fibers of the nylon yarn after dyeing. Furthermore, due to the structure of the equipment and the roll dyeing process within the machine, roll dyeing machines can cause problems such as edge-to-center color differences in the fabric width direction, color differences with darker inner and lighter outer areas along the cross-section of the fabric roll, loss of elasticity in the nylon yarn, and uneven warp tension.
[0004] Secondly, while beam dyeing machines reduce color difference issues compared to roll dyeing machines and make it easier for nylon yarn in the resulting fabric to lose elasticity, they also introduce new problems. When dyeing silk-nylon elastic fabrics with beam dyeing machines, a color difference between the inner and outer layers is prone to occur. The inner layer being darker refers to the color of the inner fabric closest to the roll after dyeing, the middle fabric being lighter, and the outer fabric furthest from the roll being darker.
[0005] Secondly, the high dyeing efficiency of the warp dyeing machine leads to a color difference of darker inside and lighter outside when dyeing sensitive colors such as coffee, brown, gray and olive green, resulting in a high defect rate. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a dyeing process for warp beam dyeing machine for elastic fabrics of silk and brocade. This process can achieve the dyeing of sensitive colors on the warp beam dyeing machine for elastic fabrics of silk and brocade interwoven with light colors on the inside and light colors on the outside, and the color fastness is high.
[0007] The technical solution adopted by the present invention to solve its technical problem is: a dyeing process for warp beam nylon elastic fabric, including the following steps: 1) silk dyeing, 2) water washing, 3) nylon dyeing, 4) water washing and soaping, 5) drying and setting; 1) Silk dyeing: The degummed elastic silk fabric is rolled onto the wire mesh of a warp beam dyeing machine; a dye liquor at 25-35℃ is injected, the pH is adjusted to 9-10, the pump is turned on to circulate for 10-15 minutes, the temperature is raised to 40℃, and then the temperature is raised to 60℃ at a rate of 0.5-1.2℃ / min, and kept at this temperature for 45-60 minutes, and then the liquor is drained; the dye liquor includes: water, 5-50g / L of reactive dye, 15-25g / L of sodium sulfate, 15-25g / L of soda ash, and 0.5-2g / L of the first leveling agent; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 0.8-1.5g / L of the second leveling agent and circulate for 5-10 minutes, then add 5-50g / L of neutral dye and circulate for 2-5 minutes. Add 3-5g / L of sodium sulfate at a uniform rate over 10-15 minutes, while circulating and heating at a rate of 0.2-0.5℃ / min to 70℃, then heat at a rate of 0.5-1.2℃ / min to 90℃, hold for 25-35 minutes, and drain the solution.
[0008] Step 1) The reactive dye is a reactive dye containing monochlorotriazine and vinyl sulfone bireactive groups.
[0009] Step 1) The first leveling agent is a mixture of sodium fatty alcohol polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether at a mass ratio of 1:1.9-2.1.
[0010] Step 3) The neutral dye is a 1:2 metal complex type neutral dye.
[0011] Step 3) The second leveling agent is leveling agent SET. Leveling agent SET achieves uniform dyeing during nylon dyeing through slow dyeing and migration, and also possesses emulsifying, dispersing, and antistatic properties. Preferably, leveling agent SET is produced by Shanghai Daxiang Chemical Industry Co., Ltd.
[0012] Step 2) The specific operation of water washing is as follows: Inject water, wash at 50-60℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; Inject water, adjust the pH to 7.5-9, wash at 20-30℃ for 3-10 minutes, drain the liquid, and repeat 1-2 times. Step 4) The specific operation of water washing and soap washing is as follows: wash with water at 60-65℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; soap wash at 60-65℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; wash with water at 40-50℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times.
[0013] Step 5) The specific operation of drying and setting is as follows: Dry the fabric at a temperature of 100~115℃ and a speed of 18~25m / min; stretch and set the silk-nylon elastic fabric at a temperature of 110-120℃ and a speed of 18~25m / min.
[0014] Step 1) The specific operation of winding the fabric onto the wire mesh of the warp dyeing machine is as follows: Take the degummed silk elastic fabric close to one end of the wire mesh and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the wire mesh, and then the silk elastic fabric is wound onto the wire mesh; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 20-30 meters.
[0015] The warp and weft density of the lead fabric is 105-115 yarns / inch in the warp direction and 70-80 yarns / inch in the weft direction; the lead fabric material is polyester, polyester-cotton blend, or polyester-cotton interweaving, and the warp and weft yarn count of the lead fabric is 40-45.
[0016] The present invention is described as follows: Preferably, the warp and weft density of the fabric is 110 yarns / inch in the warp direction and 76 yarns / inch in the weft direction.
[0017] The pH adjustment is achieved by using sodium hydroxide or acetic acid.
[0018] The circulation described in steps 1) and 3) is to turn on the pump to circulate the dye solution.
[0019] Preferably, the neutral dye is a 1:2 metal complex neutral dye produced by Yorkshire Group.
[0020] Step 3) Add 3-5g / L of sodium sulfate at a uniform rate over 10-15 minutes. Add the sodium sulfate slowly to prevent the initial dyeing from being too fast and causing color spots. Raise the temperature slowly to prevent the nylon from being dyed too quickly, resulting in a color difference and color spots between the inner and outer parts.
[0021] The present invention adopts step 1) dyeing silk first and step 3) dyeing nylon later because neutral dyes can also slightly dye silk. Therefore, in order to maintain the consistency of color on silk and nylon, reactive dyes are used to dye silk first, so that neutral dyes can be used in step 3). 1:2 metal complex neutral dyes can dye both nylon and silk at the same time, but the dyeing rate of nylon is greater than that of silk. Therefore, 1:2 metal complex neutral dyes can correct the color of both silk and nylon at the same time to achieve color consistency.
[0022] Preferably, when the concentration of the neutral dye and reactive dye in step 3) is 30-50 g / L, the dye solution formulation in step 3) further includes a fixing agent of 3-7 g / L; the fixing agent is Ivini FRN fixing agent, manufactured by Huntsman.
[0023] Step 3) The specific operation for nylon dyeing is as follows: Add water, adjust the pH to 7.5-9, raise the temperature to 40℃, first add 0.8-1.5g / L of the second leveling agent and circulate for 5-10 minutes, then add 30-50g / L of neutral dye and circulate for 2-5 minutes. Add 3-5g / L of sodium sulfate at a uniform rate over 10-15 minutes, while circulating and raising the temperature at a rate of 0.2-0.5℃ / min to 70℃, then at a rate of 0.5-1.2℃ / min to 90℃. Add 3-7g / L of fixing agent, keep warm for 25-35 minutes, and drain the solution. When dyeing dark colors with a high concentration of neutral dye, silk and nylon are prone to inconsistent color. Adding a fixing agent utilizes the characteristic of neutral dyes to dye both silk and nylon, fixing and unifying the color of the silk and nylon elastic fabrics.
[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. The warp beam dyeing process for silk-nylon elastic fabrics of the present invention enables the dyeing of sensitive colors on a warp beam dyeing machine for interwoven silk-nylon elastic fabrics, resulting in uniform dyeing and high fastness. The weft nylon yarns of the silk-nylon elastic fabric dyed by the warp beam dyeing machine do not lose elasticity, and the fabric's elasticity is well maintained after dyeing. Step 1) uses reactive dyes to dye silk. The reactive dye with monochlorotriazine and vinyl sulfone dual reactive groups achieves high fixation rate and dyeing stability through the synergistic effect of monochlorotriazine and the other reactive group, vinyl sulfone. In step 1), only silk is dyed, not nylon. However, single-reactive-group reactive dyes such as monochlorotriazine, vinyl sulfone, and SE-type reactive dyes, when applied to silk-nylon elastic fabrics, will dye the nylon simultaneously with the silk, leading to increased variables in subsequent nylon dyeing processes, uncontrollable nylon dyeing, and resulting in color differences. Under the conditions of step 1) of this invention, the reactive dye with monochlorotriazine and vinyl sulfone dual reactive groups only dyes silk, with low dyeing temperature and good dyeing uniformity, and does not dye nylon. This solves the problem of dyeing nylon in step 1) and avoiding the problem of reactive dyes interfering with the dyeing uniformity of nylon in step 3). The reactive dye with monochlorotriazine and vinyl sulfone dual reactive groups has good compatibility with neutral dyes. Combined with the operations of steps 1) and 3) of this invention, it achieves uniform color when dyeing sensitive colors such as coffee, brown, gray, and olive green, with a color difference of darker inside and lighter outside in both silk and nylon. Preferably, the reactive dye in step 1) is an M-type reactive dye.
[0025] This invention relates to a dyeing process for nylon-silk elastic fabrics using a warp beam dyeing machine, addressing the issue of color difference between the inner and outer layers. Firstly, the applicant discovered during research that the color difference between nylon and silk when dyeing nylon-silk elastic fabrics on a warp beam dyeing machine is also due to insufficient water pressure. The dye solution struggles to penetrate the center of the nylon-silk elastic fabric roll wound on the dyeing drum, resulting in high penetration resistance and uneven dyeing. The solution involves sewing a guide fabric along the width of the nylon-silk elastic fabric near one end of the degummed nylon-silk elastic fabric close to the dyeing drum. The guide fabric has a warp length of 20-30 meters. Increasing the guide fabric length increases water pressure, effectively penetrating the center of the fabric roll and achieving even dyeing. Secondly, a first leveling agent is added in step 1), and a second leveling agent is added in step 2) to achieve even dyeing, thus resolving the issue of color difference between the inner and outer layers. Secondly, in step 3), add 3-5 g / L of sodium sulfate at a uniform rate over 10-15 minutes. Adding the sodium sulfate slowly prevents the initial dyeing from being too rapid, which could lead to uneven coloring. Slowly increasing the temperature also prevents the nylon from being dyed too quickly, resulting in a darker inner fabric and uneven coloring. Thirdly, the applicant found that when dyeing nylon with neutral dyes, excessively rapid dyeing during the heating process can cause a darker inner fabric and a lighter outer fabric. Dyeing is most rapid at 40℃-70℃, followed by 70-90℃. Therefore, in step 3), the dyeing rate is increased to 70℃ at a rate of 0.2-0.5℃ / min, and then increased to 90℃ at a rate of 0.5-1.2℃ / min, holding at this temperature for 25-35 minutes. Detailed Implementation
[0026] The present invention will be further described below with reference to specific embodiments, wherein Embodiment 1 is the preferred embodiment.
[0027] The silk-nylon elastic fabric used in the examples and comparative examples is: silk-nylon elastic spun yarn, 140cm wide, 22D / 3 silk in the warp, 22D / 3 silk in the weft, 70D nylon in the weft covered with 40D spandex, warp density 48 yarns / inch × weft density 44 yarns / inch; The reactive dye is produced by Huntsman, is an M-type reactive dye, and contains monochlorotriazine and vinyl sulfone bireactive groups.
[0028] The neutral dye is a 1:2 type metal complex dye produced by Yorkshire; The fixing agent is Huntsman's product, Ivini FRN fixing agent; The first leveling agent is a mixture of sodium fatty alcohol polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:2.
[0029] The second leveling agent is leveling agent SET, produced by Shanghai Daxiang Chemical Industry Co., Ltd. The fabric specifications are T / C / 45×45 / 110×76, made of polyester-cotton blended fabric (80% polyester + 20% cotton), with both warp and weft yarns being 45 count. The warp and weft density of the fabric is 110 yarns / inch in the warp and 76 yarns / inch in the weft.
[0030] Example 1 In this embodiment, the dye is coffee-colored, and the dye mass ratio is: light red 1.2: golden yellow 1.2: light blue 2; This embodiment of the dyeing process for warp-knitted elastic fabrics includes the following steps: 1) Silk dyeing: Take the degummed silk elastic fabric near one end of the mesh cylinder and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the mesh cylinder, and then the silk elastic fabric winds onto the mesh cylinder; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 25 meters; inject 25℃ dye liquor, adjust the pH to 9-10, turn on the pump to circulate for 12 minutes, raise the temperature to 40℃, and then raise the temperature to 60℃ at a rate of 1℃ / min, keep it at this temperature for 50 minutes, and drain the liquor; the dye liquor includes: water, reactive dye 17g / L, sodium sulfate 16g / L; soda ash 16g / L, and first leveling agent 1.5g / L; 2) Water washing: Inject water, wash at 55℃ for 5 minutes, drain, repeat 2 times; Inject water, adjust pH to 7.5-9, wash at 25℃ for 5 minutes, drain, repeat 1 time; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 1.2g / L of the second leveling agent and circulate for 8 minutes, then add 22g / L of neutral dye and circulate for 3 minutes, then add 4.1g / L of sodium sulfate at a uniform rate over 15 minutes, while circulating and heating, heating to 70℃ at a rate of 0.3℃ / min, then heating to 90℃ at a rate of 0.8℃ / min, holding for 25-35 minutes, and then draining the solution; 4) Water washing and soap washing: Wash with water at 65℃ for 10 minutes, drain, and repeat once; soap wash at 65℃ for 5 minutes, drain, and repeat once; wash with water at 40℃ for 8 minutes, drain, and repeat twice. 5) Drying and setting: Dry the fabric at a temperature of 110℃ and a speed of 22m / min; stretch and set the silk-nylon elastic fabric at a temperature of 115℃ and a speed of 22m / min.
[0031] Example 2 In this embodiment, the dye is olive green, and the dye mass ratio is: light red 0.4: golden yellow 0.9: light blue 1.2. The dyeing process for warp beam elastic fabrics in this embodiment includes the following steps: 1) Silk dyeing: Take the degummed silk elastic fabric near one end of the mesh cylinder and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the mesh cylinder, and then the silk elastic fabric winds onto the mesh cylinder; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 20 meters; inject 30℃ dye liquor, adjust the pH to 9-10, turn on the pump to circulate for 10 minutes, raise the temperature to 40℃, and then raise the temperature to 60℃ at a rate of 0.5℃ / min, keep it at this temperature for 50 minutes, and drain the liquor; the dye liquor includes: water, 14g / L reactive dye, 16g / L sodium sulfate, 17g / L soda ash, and 1g / L first leveling agent; 2) Water washing: Inject water, wash at 50℃ for 5 minutes, drain, repeat 2 times; Inject water, adjust pH to 7.5-9, wash at 30℃ for 10 minutes, drain, repeat 1 time; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 1.0g / L of the second leveling agent and circulate for 5 minutes, then add 18g / L of neutral dye and circulate for 5 minutes. Add 3.6g / L of sodium sulfate at a uniform rate over 13 minutes, while circulating and heating. Heat to 70℃ at a rate of 0.2℃ / min, then heat to 90℃ at a rate of 1.2℃ / min, keep warm for 35 minutes, and drain the liquid. 4) Water washing and soap washing: Wash with 60℃ water for 5 minutes, drain, repeat 2 times; soap wash with 60℃ water for 10 minutes, drain, repeat once; wash with 50℃ water for 10 minutes, drain, repeat once. 5) Drying and setting: Dry the fabric at a temperature of 115℃ and a speed of 25m / min; stretch and set the silk-nylon elastic fabric at a temperature of 120℃ and a speed of 25m / min.
[0032] Example 3 In this embodiment, the dye is gray, and the dye mass ratio is: light red 0.8: golden yellow 0.6: light blue 1.5; The dyeing process for warp beam elastic fabrics in this embodiment includes the following steps: 1) Silk dyeing: Take the degummed silk elastic fabric near one end of the mesh cylinder and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the mesh cylinder, and then the silk elastic fabric winds onto the mesh cylinder; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 30 meters; inject 35℃ dye liquor, adjust the pH to 9-10, turn on the pump to circulate for 10 minutes, raise the temperature to 40℃, and then raise the temperature to 60℃ at a rate of 1.2℃ / min, keep it at this temperature for 45 minutes, and drain the liquor; the dye liquor includes: water, 5g / L reactive dye, 15g / L sodium sulfate, 15g / L soda ash, and 0.7g / L first leveling agent; 2) Water washing: Inject water, wash at 60℃ for 5 minutes, drain, and repeat once; Inject water, adjust pH to 7.5-9, wash at 20℃ for 3 minutes, drain, and repeat twice; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 0.8g / L of the second leveling agent and circulate for 10 minutes, then add 7g / L of neutral dye and circulate for 2 minutes, add 3g / L of sodium sulfate at a uniform rate over 10 minutes, while circulating and heating, heating to 70℃ at a rate of 0.5℃ / min, heating to 90℃ at a rate of 0.5℃ / min, keep warm for 25 minutes, and drain the liquid; 4) Water washing and soap washing: Water washing and soap washing: Wash at 60℃ for 5 minutes, drain, repeat 2 times; soap washing at 60℃ for 10 minutes, drain, repeat 1 time; wash at 50℃ for 10 minutes, drain, repeat 1 time. 5) Drying and setting: Dry the fabric at 100℃ and 18m / min; stretch and set the silk-nylon elastic fabric at 110℃ and 18m / min.
[0033] Example 4 In this embodiment, the dye is dark brown, and the dye mass ratio is light red 1.2: golden yellow 1.2: light blue 2. The dyeing process for warp beam elastic fabrics in this embodiment includes the following steps: 1) Silk dyeing: Take the degummed silk elastic fabric near one end of the mesh cylinder and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the mesh cylinder, and then the silk elastic fabric winds onto the mesh cylinder; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 28 meters; inject 30℃ dye liquor, adjust the pH to 9-10, turn on the pump to circulate for 15 minutes, raise the temperature to 40℃, and then raise the temperature to 60℃ at a rate of 1.1℃ / min, keep it at this temperature for 60 minutes, and drain the liquor; the dye liquor includes: water, 45g / L reactive dye, 22g / L sodium sulfate, 20g / L soda ash, and 0.5-2g / L first leveling agent; 2) Water washing: Inject water, wash at 60℃ for 5 minutes, drain, repeat 2 times; Inject water, adjust pH to 7.5-9, wash at 20℃ for 5 minutes, drain, repeat 1 time; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 1.5g / L of the second leveling agent and circulate for 6 minutes, then add 50g / L of neutral dye and circulate for 5 minutes, add 5g / L of sodium sulfate at a uniform rate over 15 minutes, while circulating and heating, raise the temperature to 70℃ at a rate of 0.2℃ / min, raise the temperature to 90℃ at a rate of 0.6℃ / min, add 5g / L of fixing agent, circulate, keep warm for 35 minutes, and drain the liquid; 4) Water washing and soap washing: Wash with water at 65℃ for 10 minutes, drain, and repeat once; soap wash at 65℃ for 5 minutes, drain, and repeat once; wash with water at 40℃ for 8 minutes, drain, and repeat twice.
[0034] 5) Drying and setting: Dry the fabric at a temperature of 110℃ and a speed of 20m / min; stretch and set the silk-nylon elastic fabric at a temperature of 120℃ and a speed of 20m / min.
[0035] The comparative examples are single-variable comparative embodiments designed to verify the effects of the present invention.
[0036] Comparative Example 1 The process of this comparative example is the same as that of Example 1, except that the length of the fabric is 5m.
[0037] Comparative Example 2 The process of this comparative example is the same as that of Example 1, except that the sodium sulfate in step 3) is added at a uniform rate within 2 minutes.
[0038] Comparative Example 3 The process of this comparative example is the same as that of Example 1, except that the first leveling agent was not added in step 1).
[0039] Comparative Example 4 The process of this comparative example is the same as that of Example 1, except that: in step 3), no second leveling agent was added.
[0040] Performance testing Test 1, Color difference between darker inner and lighter outer areas: Ten inspectors visually inspected the fabric, recorded the color difference levels, and took the average. For each example and comparative example, 40 meters of fabric were randomly sampled. 20 meters were sampled from the end of the fabric closest to the mesh tube (sample A), and the other 20 meters were sampled from the other end of the fabric furthest from the mesh tube (sample B). The color difference between sample A and sample B was compared. No color difference was grade 5, while a significant color difference that visually affected sales was grade 1. These factors were then used to determine the inspection rating.
[0041] Test 2, Color Consistency: Color Difference (Darker Inside, Lighter Outside): Ten inspectors visually inspected the fabric, recorded the color levels, and took the average. For each example and comparative example, 40 meters of fabric were randomly sampled. 20 meters were sampled from the end of the fabric closest to the mesh tube (Sample A), and the other 20 meters were sampled from the other end of the fabric furthest from the mesh tube (Sample B). Samples A and B showed consistent color between the silk and nylon yarns (Level 5); one of Samples A or B showed a slight difference in color between the silk and nylon yarns, requiring careful observation but not affecting sales (Level 4); both Samples A and B showed slight differences, but not affecting sales (Level 3); one of Samples A or B showed a significant difference in color between the silk and nylon yarns (Level 2); both Samples A and B showed significant color deviation, with noticeable visual effects, affecting sales (Level 1).
[0042] Test 3: The weft elastic recovery rate of the nylon elastic yarn used in the examples and comparative examples was tested before and after dyeing. The weft elasticity retention rate before and after dyeing was calculated as: (Weft elastic recovery rate before dyeing / Weft elastic recovery rate after dyeing) × 100%.
[0043] Table 1. Test results for examples and comparative examples. As shown in Table 1, the silk-nylon elastic fabrics obtained using the processes of Examples 1-4 do not have color difference issues. This solves the problem of color difference (darker inside, lighter outside) that easily occurs when dyeing sensitive colors using a warp beam dyeing machine. Furthermore, the warp and weft yarns exhibit high color consistency, and the weft elasticity retention rate is high after dyeing. Because the weft is in a relaxed state during warp beam dyeing, the weft elasticity retention rate is high before and after dyeing.
[0044] In Comparative Example 1, due to insufficient fabric length and water pressure, the fabric along the mesh tube exhibited a noticeable color difference, with the inner side being darker and the outer side lighter.
[0045] The addition of the white powder in the comparative example was too fast, while the dyeing speed of the nylon was relatively fast. This resulted in a significant color difference between the darker inner and lighter outer layers of the nylon yarn, which also affected the color difference and fastness of the fabric.
[0046] In step 1) of Comparative Example 3, without the addition of the first leveling agent, the silk yarn had a problem of being darker inside and lighter outside, and the color of the silk warp yarn also had a deviation.
[0047] In step 3 of Comparative Example 3, without the addition of a second leveling agent, the nylon on fabric samples A and B showed deviations in color and was uneven, with obvious color differences between the inside and outside.
[0048] Fabrics with poor dyeing results obtained in Comparative Examples 1-4 were re-dyed, recolored, and repaired after the experiments, and then sold normally or at a reduced price. The examples avoid the problems of re-dyeing, recoloring, and repairing during production, as seen in the comparative examples, thus improving the fabric dyeing pass rate and reducing costs.
[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.
Claims
1. A dyeing process for warp beam nylon elastic fabric, characterized in that, Includes the following steps: 1) Silk dyeing, 2) Washing, 3) Nylon dyeing, 4) Washing and soaping, 5) Drying and setting; 1) Silk dyeing: The degummed elastic silk fabric is rolled onto the wire mesh of a warp beam dyeing machine; a dye liquor at 25-35℃ is injected, the pH is adjusted to 9-10, the pump is turned on to circulate for 10-15 minutes, the temperature is raised to 40℃, and then the temperature is raised to 60℃ at a rate of 0.5-1.2℃ / min, and kept at this temperature for 45-60 minutes, and then the liquor is drained; the dye liquor includes: water, 5-50g / L of reactive dye, 15-25g / L of sodium sulfate, 15-25g / L of soda ash, and 0.5-2g / L of the first leveling agent; 3) Nylon dyeing: Add water, adjust pH to 7.5-9, heat to 40℃, first add 0.8-1.5g / L of the second leveling agent, circulate for 5-10 minutes, then add 5-50g / L of neutral dye, circulate for 2-5 minutes, add 3-5g / L of sodium sulfate at a uniform rate over 10-15 minutes, while circulating and heating, raise the temperature to 70℃ at a rate of 0.2-0.5℃ / min, raise the temperature to 90℃ at a rate of 0.5-1.2℃ / min, keep warm for 25-35 minutes, and drain the solution.
2. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 1) The reactive dye is a reactive dye containing monochlorotriazine and vinyl sulfone bireactive groups.
3. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 1) The first leveling agent is a mixture of sodium fatty alcohol polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether at a mass ratio of 1:1.9-2.
1.
4. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 3) The neutral dye is a 1:2 metal complex type neutral dye.
5. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 3) The second leveling agent is leveling agent SET.
6. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 2) The specific operation of water washing is as follows: Inject water, wash at 50-60℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; Inject water, adjust the pH to 7.5-9, wash at 20-30℃ for 3-10 minutes, drain the liquid, and repeat 1-2 times.
7. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 4) The specific operation of water washing and soap washing is as follows: wash with water at 60-65℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; soap wash at 60-65℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times; wash with water at 40-50℃ for 5-10 minutes, drain the liquid, and repeat 1-2 times.
8. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 5) The specific operation of drying and setting is as follows: Dry the fabric at a temperature of 100~115℃ and a speed of 18~25m / min; stretch and set the silk-nylon elastic fabric at a temperature of 110-120℃ and a speed of 18~25m / min.
9. The dyeing process for warp beam nylon elastic fabric according to claim 1, characterized in that: Step 1) The specific operation of winding the fabric onto the wire mesh of the warp dyeing machine is as follows: Take the degummed silk elastic fabric close to one end of the wire mesh and sew a guide fabric along the width of the silk elastic fabric; the guide fabric first contacts and winds into the wire mesh, and then the silk elastic fabric is wound onto the wire mesh; the width of the guide fabric is the same as the width of the silk elastic fabric, and the warp length of the guide fabric is 20-30 meters.
10. The dyeing process for warp beam nylon elastic fabric according to claim 9, characterized in that: The warp and weft density of the lead fabric is 105-115 yarns / inch in the warp direction and 70-80 yarns / inch in the weft direction; the lead fabric material is polyester, polyester-cotton blend, or polyester-cotton interweaving, and the warp and weft yarn count of the lead fabric is 40-45.