Cotton-brocade blended and interwoven Shilin dyeing process
By improving the dyeing process for cotton-nylon blended fabrics, including soaking and stretching the fabric in boiling water, infrared radiation, low-temperature pre-drying, liquid-sealed double rolling, and hot and cold water washing, combined with dye component optimization, the problem of wrinkling in cotton-nylon blended fabrics on long-distance printing was solved, achieving a high-efficiency and low-consumption dyeing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG MIZUDA TEXTILE PRINTING & DYEING TECH CO LTD
- Filing Date
- 2026-02-05
- Publication Date
- 2026-05-08
AI Technical Summary
Cotton-nylon blended fabrics tend to wrinkle when produced on long-running machines, resulting in low production efficiency and high water consumption. Existing single-dyeing processes for cotton fabrics using vat dyeing are also inefficient when produced on long-running machines.
The process employs a cotton-nylon blended interweaving type of vat dyeing, which includes soaking the greige fabric in boiling water at 90-100℃, stretching it to the width after soaking, infrared bleaching, pre-drying at a temperature ≤80℃, passing it through a liquid-sealed double lining, and washing it with cold water, hot water, and soap. Combined with optimized dye components, the use of KL leveling agent, and improvements to the long-line dyeing process, the wrinkling problem can be solved.
It effectively solves the problem of fabric wrinkling, improves production efficiency, reduces water consumption, and achieves good dyeing results. The efficiency is increased to 3 times that of vat dyeing, and water consumption is reduced to 1/5 of vat dyeing.
Smart Images
Figure CN121992671A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of fabric dyeing technology, and in particular relates to a cotton-nylon blend interweaving vat dyeing process. Background Technology
[0002] For pure cotton fabrics, multiple processes are typically performed sequentially on a long dyeing machine for single-stage vat dyeing. Infrared equipment on the machine heats the fabric before dyeing using infrared rays, improving dye evenness and penetration. A pre-drying chamber is also installed on the machine, located after the color-fixing and drying process. The fabric passes through the pre-drying chamber (90-100℃) to reduce its moisture content, preventing excessively rapid moisture evaporation during color-fixing and drying, which could lead to dye migration and color differences.
[0003] Currently, cotton-nylon blended fabrics using the same vat dyeing process as cotton fabrics tend to wrinkle when produced on long-distance machines. Therefore, they are generally dyed using a vat dyeing process (overflow dyeing), which involves dyeing with acid dye first, then reactive dye, before mass production. This process takes about 30 hours per 10,000 meters, resulting in low production efficiency. Summary of the Invention
[0004] The purpose of this invention is to provide a vat dyeing process for cotton-nylon blended fabrics. This invention offers advantages such as low water consumption and high efficiency in dyeing cotton-nylon blended fabrics.
[0005] The technical solution of this invention: A cotton-nylon blended fabric dyeing process, comprising the following steps: a) Take a sample of the cotton-nylon blended fabric, soak it in boiling water at 90-100℃ for 25-35 seconds, measure the width, stretch the cotton-nylon blended fabric to the width after soaking in boiling water, and then put it on a long machine for single dyeing with vat; b) When the fabric moves on the long machine, it jumps through the infrared rays on the long machine; c) The pre-drying temperature of the fabric is ≤80℃; d) When the fabric passes through the steamer, it is double-rolled by liquid sealing; e) The fabric is first washed with cold water, then washed with hot water, and then soaped.
[0006] In the aforementioned cotton-nylon blended interwoven fabric dyeing process, the hot water washing temperature is 75-85℃, and the soap washing temperature is above 90℃.
[0007] In the aforementioned cotton-nylon blended interwoven fabric dyeing process, the hot water washing temperature is 80℃, and the soap washing temperature is 95℃.
[0008] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to a medium-light khaki color, the components of the vat dye used include F-3G, BR and T, or F-3G, F, 3B, BR and T, or F-3G, F, 3B, LGG and T.
[0009] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to gray, the components of the vat dye used include RB, RSN and F3B, or BR, T and RB, or F-3G, LGG and RB.
[0010] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to a green hue, the components of the vat dye used include GN, RB, and T, or include GN, T, LGG, and RB.
[0011] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to a blue hue, the components of the vat dye used include RSN, RB, and F-3B, or include VB, RB, and F3B.
[0012] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to a yellow hue, the components of the vat dye used include G, BR, and T, or include LGG, BR, and T, or include F-3G, BR, and T.
[0013] In the aforementioned cotton-nylon blended interweaving vat dyeing process, when dyeing the greige fabric to a dark color, KL leveling agent is added to the vat dye.
[0014] Compared with existing technologies, this invention performs dyeing on a long-line dyeing machine. The fabric is soaked in boiling water, its width is measured, and then stretched to the soaked width. Ultraviolet light is applied, the pre-drying chamber temperature is lowered, and double-rolling is used for color fixing. This combination of four methods effectively solves the problem of wrinkling on the fabric. Compared to vat dyeing, long-line dyeing can effectively reduce water consumption by 500%. Long-line dyeing consumes approximately 15 tons of water per 10,000 meters, while vat dyeing requires 80 tons per 10,000 meters. Furthermore, vat dyeing of 10,000 meters only takes 3 hours, while vat dyeing takes 30 hours, making it significantly more efficient. Therefore, this invention has the advantages of low water consumption and high efficiency in dyeing cotton-nylon blended fabrics.
[0015] In addition, the present invention optimizes the dye formulation. When dyeing dark colors, the combination with the best affinity for nylon is selected and combined with the leveling agent for large-scale production, which can effectively solve the problem of color depth and achieve good dyeing effect. Attached Figure Description
[0016] Figure 1 This is a schematic diagram showing the changes in fabric width after it has been stretched on the setting machine and then soaked in water at various temperatures.
[0017] Figure 2 This is a schematic diagram of the fabric being fed into the rolling mill during tie-dyeing.
[0018] Figure 3 This is a schematic diagram of the fabric in the first drying chamber of the drying room.
[0019] Figure 4This is a schematic diagram of the fabric in the second drying chamber of the drying room.
[0020] Figure 5 This is a schematic diagram of the fabric in the third drying chamber of the drying room.
[0021] Figure 6 This is a schematic diagram of the fabric after it has exited the steamer.
[0022] Figure 7 This is a schematic diagram of the fabric being washed in a hot water tank.
[0023] Figure 8 This is a schematic diagram of the fabric being soaped in a washing tank.
[0024] Figure 9 This is a schematic diagram of the corresponding drying cylinder during the drying and shaping of the fabric.
[0025] Figure 10 These are monochrome color comparison images showing the effects of dyeing greige fabric with F3G Yellow, G Yellow, and F3B at concentrations of 1g / L and 5g / L respectively.
[0026] Figure 11 These are monochrome color comparison images of LGG brown, BR brown, and T olive dyed on greige fabric at concentrations of 5g / L, 15g / L, and 30g / L, respectively.
[0027] Figure 12 These are monochrome color comparison images showing the effects of dyeing greige fabric with RB black and GN grass green at concentrations of 5g / L, 15g / L, and 30g / L respectively.
[0028] Figure 13 These are monochrome color comparison images showing the effects of dyeing greige fabric with B green, BC bleached blue, and VB blue at concentrations of 5g / L, 15g / L, and 30g / L, respectively.
[0029] Figure 14 These are monochrome color comparison images showing the effects of dyeing greige fabric with RSN brilliant blue, BCN black, and GR orange at concentrations of 5g / L, 15g / L, and 30g / L, respectively.
[0030] Figure 15 These are the effect diagrams of each greige fabric after dyeing, corresponding to Table 2.
[0031] Figure 16 This is a picture of the effect of dyeing a light-colored greige fabric after mixing and dyeing F-3G, BR, and T.
[0032] Figure 17 This is a picture of the effect of dyeing a light-colored greige fabric after mixing RSN, RB, and F-3B dyes.
[0033] Figure 18These are renderings of the fabrics after each dyeing formula has been blended and dyed in a dark color. Detailed Implementation
[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.
[0035] Example 1: A cotton-nylon blended interwoven fabric dyeing process using a long-car tie-dyeing and pad-dyeing process. The mainstream process of long-car tie-dyeing includes: heating the greige fabric with infrared light and then feeding it into the dyeing tank → pad-dyeing (with dye liquor / alkali / reducing agent) → low-temperature pre-drying in the drying room → steaming in the steamer (core color fixing + dye penetration) → washing / soaping in the washing tank (removing floating color + assisting in improving fastness) → drying and setting.
[0036] This invention is an improvement on the existing mainstream long-car dyeing process, and the improvements include the following steps:
[0037] Step a, Pretreatment: This occurs before the greige fabric enters the long-running machine: Take a sample of cotton-nylon blended greige fabric, soak it in boiling water at 90-100℃ for 30 seconds, and then measure its width. Width the cotton-nylon blended greige fabric to the width after soaking in boiling water before it enters the long-running machine for single-color dyeing. It is preferable to use a setting machine to stretch the width, which facilitates continuous production in conjunction with the long-running machine. Table 1 below shows the tests conducted on two specifications of greige fabric, with width in cm.
[0038] Table 1
[0039]
[0040] Experiments 1 and 2 show that when the greige fabric is neither set nor stretched, the width changes significantly after soaking in water, and the higher the water temperature, the greater the change. Experiments 3 and 4 show that when the greige fabric is set but not stretched to its maximum width, the width also changes significantly after soaking in water. Experiments 5 and 6, and... Figure 1 As can be seen, after the greige fabric is set and its width is increased by 5cm, the width change after soaking in water is almost negligible. This ensures that the greige fabric will not wrinkle after soaking on the long sewing machine, resulting in more even dyeing and a smoother finished fabric. In contrast, greige fabric that has not been widened will produce 100% wrinkled fabric. Widening the width before boarding the long sewing machine is the core technical means to ensure that cotton-nylon blended greige fabrics do not wrinkle.
[0041] Step b: When the greige fabric moves on the long carriage, it needs to bypass the infrared rays on the carriage. This can be done by turning off the infrared rays or changing the fabric's trajectory to avoid them. For pure cotton greige fabrics, passing through infrared rays does not have a negative impact. However, for cotton-nylon blended greige fabrics, it has been found that the nylon fibers they contain swell rapidly under high infrared temperatures, causing the fabric to wrinkle. Therefore, it is necessary to eliminate the effect of infrared rays.
[0042] Step c: The pre-drying temperature of the fabric is ≤80℃. In the example, there are three drying chambers in the drying room along the forward direction of the fabric, with temperatures of 60℃, 70℃ and 80℃ respectively. The fabric is put into the steaming box in a semi-dry state.
[0043] Step d: The fabric passes through a liquid-sealed double-roller when passing through the steamer. Double rolling is necessary because nylon swells rapidly at high temperatures. Using liquid-sealed double rolling allows the fabric to pass through under the action of a large tension. If only single rolling is used, the probability of wrinkling is close to 100%.
[0044] Step e: In this embodiment, the washing tank has nine compartments along the direction of fabric movement. The first four compartments are for cold water (room temperature), followed by two compartments for hot water at 80°C, and the last three compartments for soap washing at 95°C. The initial cold water wash gently removes surface dye from the fabric, preventing it from penetrating into the fibers during subsequent hot water washing and causing color variations or stains. The subsequent hot water wash expands the fibers, allowing residual, incompletely fixed dye to fully detach from the fiber gaps, clearing the way for the subsequent soap washing and improving the cleaning effect.
[0045] from Figures 2 to 9 It can be seen that the fabric remains flat and wrinkle-free throughout all stages of its journey on the long machine.
[0046] As a preferred option, mercerizing is added before dyeing the greige fabric to make the cotton fibers in the greige fabric more fully colored and to improve the overall depth of the fabric surface (mercerization is not performed in overflow dyeing because it involves biological enzyme polishing).
[0047] Example 2: The effect of single dyeing with various vat dyes used in pad dyeing is as follows. Figures 10 to 14 As shown in the image. Tests have shown that vat dyeing has a good dyeing effect on nylon, with an uptake of 50%.
[0048] For the various vat dyes used in pad dyeing, the following table 2 shows typical failure cases of mixed dyeing.
[0049] Table 2
[0050]
[0051] After numerous experiments and repeated adjustments, it was finally determined that when dyeing the greige fabric to a medium-light khaki color, the components of the vat dye used should include F-3G, BR, and T, or include F-3G, F, 3B, BR, and T, or include F-3G, F, 3B, LGG, and T.
[0052] When dyeing greige fabric to a gray tone, the components of the vat dye used include RB, RSN and F3B, or BR, T and RB, or F-3G, LGG and RB.
[0053] When dyeing greige fabric to a green hue, the components of the vat dye used include GN, RB, and T, or include GN, T, LGG, and RB.
[0054] When dyeing greige fabric to a blue hue, the components of the vat dye used include RSN, RB, and F-3B, or include VB, RB, and F3B.
[0055] When dyeing greige fabric to a yellow hue, the components of the vat dye used include G, BR, and T, or LGG, BR, and T, or F-3G, BR, and T.
[0056] When dyeing the greige fabric to a dark color, the vat dye contains KL leveling agent produced by Wuxi Kailai Biotechnology.
[0057] like Figures 15 to 18 In the text, the unit for the dyeing formula below the fabric is g / L.
[0058] Final inspection showed that all fastness properties of the dyed fabric, including color fastness, met industry requirements.
Claims
1. A cotton-nylon blended interweaving vat dyeing process, characterized in that: The process includes the following steps: a) Take a sample of cotton-nylon blended fabric, soak it in boiling water at 90-100℃ for 25-35 seconds, measure the width, stretch the cotton-nylon blended fabric to the width after soaking in boiling water, and then put it on a long machine for single dyeing in vat; b) When the fabric moves on the long machine, it is tested for infrared radiation on the long machine. c. The pre-drying temperature of the fabric is ≤80℃; d. The fabric is double-rolled by liquid seal when passing through the steamer; e. The fabric is first washed with cold water, then with hot water, and then with soap.
2. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: The hot water temperature for washing is 75-85℃, and the temperature for soap washing is above 90℃.
3. The cotton-nylon blended interweaving vat dyeing process according to claim 2, characterized in that: The hot water temperature for washing is 80℃, and the soaping temperature is 95℃.
4. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: When dyeing greige fabric to a medium-light khaki color, the components of the vat dye used include F-3G, BR and T, or F-3G, F, 3B, BR and T, or F-3G, F, 3B, LGG and T.
5. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: When dyeing greige fabric to a gray tone, the components of the vat dye used include RB, RSN and F3B, or BR, T and RB, or F-3G, LGG and RB.
6. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: When dyeing greige fabric to a green hue, the components of the vat dye used include GN, RB, and T, or include GN, T, LGG, and RB.
7. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: When dyeing greige fabric to a blue hue, the components of the vat dye used include RSN, RB, and F-3B, or include VB, RB, and F3B.
8. The cotton-nylon blended interweaving vat dyeing process according to claim 1, characterized in that: When dyeing greige fabric to a yellow hue, the components of the vat dye used include G, BR, and T, or LGG, BR, and T, or F-3G, BR, and T.
9. The cotton-nylon blended interweaving vat dyeing process according to any one of claims 4 to 8, characterized in that: When dyeing the greige fabric to a dark color, KL leveling agent is added to the vat dye.