Method of controlling dye uniformity of cotton cashmere blended yarn

Abstract

The application discloses a method for controlling the same-color effect of cotton cashmere blended yarn dyeing, and belongs to the technical field of yarn dyeing in the textile industry. The technical scheme is as follows: 1) dyeing style analysis and raw yarn preparation: selecting yarn according to the final dyeing style of the yarn and the whiteness requirement after pretreatment; 2) pretreatment of the blended yarn: adopting a biological enzyme pretreatment process for the blended yarn one; adopting a refining agent and oil removing agent washing process for the blended yarn two; adopting a biological enzyme pretreatment process and an oxygen bleaching pretreatment process for the blended yarn three in sequence; 3) dyeing: dyeing the pretreated yarn by using a medium-temperature type reactive dye, and adding dyeing leveling agents and reactive dyes; and 4) post-treatment. The method for dyeing after selecting different raw yarn types and pretreatment processes realizes the control of the same-color effect and the effect of patterned yarn of the cotton cashmere blended yarn dyeing.

Description

Technical Field

[0001] This invention belongs to the field of yarn dyeing technology in the textile industry, and specifically relates to a method for controlling the color uniformity of cotton-cashmere blended yarns during dyeing. Background Technology

[0002] Cotton-cashmere blended yarn is made by blending cotton and cashmere fibers in a certain proportion. Fabrics woven from this blend are soft, skin-friendly, moisture-wicking, breathable, moderately warm, and easy to care for, offering high cost-effectiveness and making them a top choice for everyday luxury. They are highly favored by the market and customers. However, due to significant differences in fiber composition and dyeing characteristics, dyeing cotton and cashmere blended yarns often results in poor color matching and color variations. While controlling dyeing process conditions can meet the needs of customers who prefer heather-like fabrics, it is difficult to satisfy those requiring a consistent color. Currently, dye screening is used to address this issue, but the improvement is limited. Furthermore, using specialized dyes increases usage restrictions and hinders factory inventory cost control. Finding a method to precisely control the color matching and pattern effects of cotton-cashmere blended yarn dyeing is a major challenge in cotton-cashmere blended yarn dyeing and is key to meeting the diverse fabric style requirements of different customers. Summary of the Invention

[0003] This invention provides a method for controlling the color uniformity of cotton-cashmere blended yarns during dyeing. It eliminates the need to select specific dyes and dyeing processes. By controlling the selection of raw yarns and the pretreatment process, the color uniformity and patterned yarn effects of cotton-cashmere blended yarns can be controlled, thereby meeting the needs of different customers for different fabric styles of cotton-cashmere fabrics.

[0004] The technical solution of this invention is as follows: Methods for controlling color uniformity in dyeing cotton-cashmere blended yarns include dyeing style analysis and raw yarn preparation, pretreatment, dyeing, and posttreatment, specifically: 1) Dyeing style analysis and raw yarn preparation: Select yarn according to the final dyeing style of the yarn and the whiteness requirement after pretreatment. For blended yarns that produce the same color effect and require a whiteness of <50 after pretreatment, use a blended yarn of raw cotton and cashmere. The blended yarn that produces the same color effect and requires a whiteness of ≥50 after pretreatment is made of bleached cotton and cashmere blended yarn. The third blended yarn that produces the ash-gray effect is made from a blend of raw cotton and cashmere. The cashmere content in blended yarn 1, blended yarn 2, and blended yarn 3 is ≤30%.

[0005] 2) Preprocessing The first pretreatment of blended yarn uses a bio-enzyme pretreatment process; the second pretreatment of blended yarn uses a washing process with refining agent and degreasing agent; the third pretreatment of blended yarn uses a bio-enzyme pretreatment process and an oxygen bleaching pretreatment process in sequence. 3) Staining The pretreated yarn is dyed with a medium-temperature reactive dye. A dyeing leveling agent and reactive dye are added, and the mixture is kept at a temperature of 10-20 min. Then, 20-60 g / L of sodium sulfate is added, and the mixture is kept at a temperature of 20-40 min. The temperature is increased to 55-60°C at a rate of 0.8-1°C / min. Soda ash is added, with a dosage of ≤7 g / L. The mixture is kept at a temperature of 40-50 min, and then the liquid is drained. The yarn is then placed in warm water, and the temperature is increased to 60-70°C and maintained for 10-15 min. Finally, the liquid is drained. 4) Post-processing Add 1-2g / L of anti-stain soap ZS-CW to the tub at a bath ratio of 1:8-16, heat to 80-90℃ and keep warm for 15-20 minutes, drain, add warm water, rinse for 5-10 minutes and drain again.

[0006] Preferably, the pretreatment process of the bio-enzyme in step 2) is as follows: 1. Add room temperature water to the main tank at a bath ratio of 1:6-16. After heating to 35-45℃, add 0.5-1g / L of high-efficiency penetrating refining agent RW to the main tank and circulate for 3-5 minutes. Then add 0.5%-1%owf of refining enzyme SOFT and circulate for 3-5 minutes. 2. Increase the temperature to 55-60℃ at a heating rate of 2-2.5℃ / min and circulate for 30-40 minutes. After completion, increase the temperature to 80-85℃ at a heating rate of 2-2.5℃ / min and circulate for 30-40 minutes. After completion, drain the liquid.

[0007] Preferably, the washing process of refining agent and degreasing agent in step 2) is as follows: the blended yarn and room temperature water are added to the main tank at a bath ratio of 1:6-16. After heating to 35-45°C, 0.5-1g / L of high-efficiency penetrating refining agent RW and 1-2g / L of degreasing agent TF-109H are added to the main tank and circulated for 3-5 minutes; the temperature is increased to 80-85°C at a heating rate of 2-2.5°C / min and circulated for 20-30 minutes, and then the liquid is drained; warm water is added and circulated for 5-10 minutes, and then the liquid is drained.

[0008] Preferably, the oxygen bleaching pretreatment process is as follows: the blended yarn that has been treated with bio-enzymes in the vat is further added to the main vat at a bath ratio of 1:6-16. High-efficiency penetrating refining agent RW 0.5-1g / L and multi-effect pretreatment auxiliary agent PCC-B 1.5-2g / L are added to the main vat. After circulating and maintaining for 3-5 minutes, hydrogen peroxide 10-15g / L is added. The temperature is increased to 75-85℃ at a heating rate of 2-2.5℃ / min, and circulated and maintained for 30-40 minutes. After completion, the liquid is drained. The yarn is then rinsed in warm water for 5-10 minutes, and then drained.

[0009] Preferably, blended yarn one, blended yarn two, and blended yarn three are all in the form of cone yarns or warp beams, with each cone yarn weighing 0.9±0.1kg and having a density of 0.32-0.36g / cm³. 3 The density of the warp shaft is 0.44-0.48 g / cm³. 3 .

[0010] Preferably, the ambient water temperature is 20-30°C, and the warm water temperature is 45-55°C.

[0011] Preferably, the pretreatment, staining and posttreatment all adopt a positive pump circulation method from the inside to the outside.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This invention achieves control over the color matching and patterned effect of cotton-cashmere blended yarns by selecting different types of raw yarns and pretreatment processes before dyeing. This eliminates the need to select specific dyes and dyeing processes, enabling both color matching and patterned effects to be achieved in cotton-cashmere blended yarns. This satisfies the different fabric styles required by various customers, while also reducing the inventory cost pressure caused by using specific dyes and the operational difficulties caused by using special processes.

[0013] 2. This invention allows for the adjustment of the heather color on the fabric by separating yarns of different styles (such as suede and heather) in proportion, thus achieving flexible production of "one dyeing, multiple styles" and meeting the market demand for small batches and multiple varieties. Attached Figure Description

[0014] Figure 1 This is a color-matched effect diagram of Embodiment 1 of the present invention.

[0015] Figure 2 This is a rendering of the ash effect from Embodiment 2 of the present invention.

[0016] Figure 3 This is a rendering of the ash effect from Embodiment 3 of the present invention.

[0017] Figure 4These are fabric surface images showing the effect of dyeing the yarn warp direction in a 1:1 ratio after dyeing the fabric to achieve the heather effect in Example 3 and the same color effect in Example 4. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions will be clearly and completely described below in conjunction with the embodiments of this invention.

[0019] The anti-stain soap detergent ZS-CW was purchased from Shijiazhuang Kunpu Chemical Co., Ltd. The high-efficiency penetrant refining agent RW was purchased from Angco Chemical (China) Co., Ltd. The refined enzyme SOFT was purchased from Angga Chemical (China) Co., Ltd. Degreasing agent TF-109H was purchased from Zhejiang Transfar Co., Ltd. The multi-effect pretreatment agent PCC-B was purchased from the Hangzhou branch of Dorn Biotechnology Co., Ltd. The leveling agent LAR-LR was purchased from Zibo Lurui Fine Chemical Co., Ltd. The reactive dyes Blue K-HL, Red K-3BS, and Yellow K-3RS were purchased from Kexco International Trading (Shanghai) Co., Ltd. Reactive dye Blue C-4R (Angco Chemical (China) Co., Ltd.).

[0020] Example 1 The method for controlling the color matching of cotton-cashmere blended yarns, for cotton-cashmere yarns achieving color matching, with the target sample being a purple fabric sample, requires a whiteness of <50 after pretreatment, specifically includes the following steps: 1) Yarn Selection: 50-count cotton and cashmere blended yarn with a blend ratio of 85:15 was selected and subjected to laboratory-level pretreatment according to the pretreatment method in step 2). The pretreated yarn was then tested for whiteness and subjected to laboratory dyeing experiments. The whiteness of the cotton and cashmere blended yarn after pretreatment was 38, which meets the requirements for dyeing the target sample in purple. Therefore, a cotton and cashmere blended yarn was selected. The dyeing method was cone dyeing, with each cone weighing 1 kg and having a density of 0.36 g / cm³. 3 ; 2) Pretreatment: Cotton and cashmere blended yarn and room temperature water at 25℃ are added to the main tank at a bath ratio of 1:8. After heating to 40℃, 1g / L of high-efficiency penetrating refining agent RW is added to the main tank and circulated for 5 minutes. Then, 1%owf of refining enzyme SOFT is added and circulated for 5 minutes. The temperature is then increased to 55℃ at a rate of 2℃ / min and circulated for 40 minutes. Finally, the temperature is increased to 85℃ at a rate of 2℃ / min and circulated for 40 minutes. After the process is complete, the liquid is drained. The pretreatment adopts a positive pump circulation method from the inside to the outside. 3) Dyeing: Add the pretreated blended yarn and room temperature water (25℃) to the main dyeing tank at a liquor ratio of 1:8. Add leveling agent LAR-LR 2g / L and reactive dyes Blue K-HL 0.385%, Red K-3BS 150% 0.253%, and Yellow K-3RS 150% 0.144% to the main dyeing tank and keep warm for 20min. Add sodium sulfate 30g / L and keep warm for 20min. Increase the temperature to 60℃ at 1℃ / min. Add soda ash (3g / L) and keep warm for 40min. Drain the liquid and add warm water. Increase the temperature to 60℃ and keep warm for 10min. Drain the liquid. The dyeing process uses a positive pump circulation method from the inside to the outside. 4) The post-treatment process is as follows: Add 50℃ warm water, with a bath ratio of 1:8, add 2g / L of anti-staining soap detergent ZS-CW to the main tank, heat to 80℃ and keep warm for 20 minutes, drain, add 50℃ warm water, wash for 10 minutes and drain. The post-treatment adopts a positive pump circulation method from the inside to the outside.

[0021] The same color effect diagram in this embodiment is as follows: Figure 1 As shown, according to the GB / T 250 gray sample card 5-level rating standard, the color similarity rating is 4-5.

[0022] Example 2 The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns, specifically for dyeing cotton-cashmere yarns with a heather gray effect, with a purple fabric sample as the target sample, includes the following steps: 1) The yarn specifications selected are 50-count yarn with a cotton and cashmere blend ratio of 85:15, dyed using cone dyeing, with a cone weight of 0.9kg and a density of 0.32g / cm³. 3 ; 2) Pretreatment: First, perform bio-enzyme treatment. Add the yarn and 30℃ room temperature water to the main tank at a bath ratio of 1:8. After heating to 40℃, add 1g / L of high-efficiency penetrating refining agent RW to the main tank and circulate for 5 minutes. Then add 1%owf of refining enzyme SOFT and circulate for 5 minutes. Increase the temperature to 55℃ at a rate of 2℃ / min and circulate for 40 minutes. After that, increase the temperature to 85℃ at a rate of 2℃ / min and circulate for 40 minutes. After that, drain the liquid. Next, oxygen bleaching treatment is performed. 30℃ room temperature water is added to the main tank at a bath ratio of 1:8. High-efficiency penetrating refining agent RW 1g / L and multi-effect pretreatment aid PCC-B 2g / L are added to the main tank. After circulating and maintaining for 5 minutes, hydrogen peroxide (mass fraction 27.5%) 15g / L is added. The temperature is increased to 85℃ at a rate of 2℃ / min and circulated and maintained for 40 minutes. After completion, the liquid is drained. 30℃ warm water is added and circulated for washing for 10 minutes. After completion, the liquid is drained. The pretreatment adopts a positive pump circulation method from the inside to the outside. 3) Dyeing: Add 30℃ room temperature water to the main tank at a bath ratio of 1:8. Add leveling agent LAR-LR 2g / L and reactive dyes Blue K-HL 0.385%, Red K-3BS 150% 0.253%, and Yellow K-3RS 150% 0.144% to the main tank and keep warm for 20 minutes. Add sodium sulfate 20g / L to the main tank and keep warm for 20 minutes. Increase the temperature to 60°C at 1°C / min. Add soda ash to the main tank with a concentration of 3.5g / L and keep warm for 40 minutes, then drain the liquid. Add warm water, increase the temperature to 60°C and keep warm for 10 minutes, then drain the liquid. Dyeing is done using a positive pump circulation method from the inside out. 4) Post-treatment: Add 50℃ warm water, with a bath ratio of 1:8. Add 2g / L of anti-staining soap detergent ZS-CW to the main tank, heat to 80℃ and keep warm for 20 minutes. Drain the water, add warm water, wash for 10 minutes, and then drain the water. The post-treatment adopts a positive pump circulation method from the inside to the outside.

[0023] The effect of the ash pattern in this embodiment is shown in the image below. Figure 2 As shown, according to the GB / T 250 gray sample card 5-level rating standard, the color similarity rating is 3-4.

[0024] Example 3 The method for controlling the color uniformity of dyeing cotton-cashmere blended yarn, specifically for dyeing cotton-cashmere yarn with a heather gray effect, with a target sample being a blue fabric sample, includes the following steps: 1) The yarn specifications selected are 50-count yarn with a cotton and cashmere blend ratio of 70:30, dyed by warp beam dyeing, with a warp beam density of 0.44 g / cm³. 3 ; 2) Pretreatment: First, perform bio-enzyme treatment. Add the yarn and 30℃ room temperature water to the main tank at a bath ratio of 1:16. After heating to 40℃, add 0.5g / L of high-efficiency penetrating refining agent RW to the main tank and circulate for 3 minutes. Then add 0.5%owf of refining enzyme SOFT and circulate for 3 minutes. Increase the temperature to 60℃ at a rate of 2.5℃ / min and circulate for 30 minutes. After that, increase the temperature to 80℃ at a rate of 2.5℃ / min and circulate for 30 minutes. Then drain the liquid. Next, oxygen bleaching treatment is performed. 30℃ room temperature water is added to the main tank at a bath ratio of 1:16. High-efficiency penetrating refining agent RW 0.5g / L and multi-effect pretreatment aid PCC-B 1.5g / L are added to the main tank. After circulating and maintaining for 3 minutes, hydrogen peroxide (mass fraction 27.5%) 10g / L is added. The temperature is increased to 75℃ at a rate of 2.5℃ / min and circulated and maintained for 30 minutes. After completion, the liquid is drained. 30℃ warm water is added and circulated for washing for 5 minutes. After completion, the liquid is drained. The pretreatment adopts a positive pump circulation method from the inside to the outside. 3) Dyeing: Add 30℃ room temperature water to the main tank at a bath ratio of 1:16. Add leveling agent LAR-LR 2g / L and reactive dyes Blue K-HL 0.215%, Red K-3BS 150% 0.17%, and Blue C-4R 0.64% to the main tank and keep warm for 20 min. Add sodium sulfate 60g / L to the main tank and keep warm for 20 min. Increase the temperature to 60°C at 1°C / min. Add soda ash to the main tank at a concentration of 5g / L and keep warm for 40 min, then drain the liquid. Add warm water, increase the temperature to 60°C and keep warm for 10 min, then drain the liquid. Dyeing is carried out using a positive pump circulation method from the inside to the outside. 4) Post-treatment: Add 50℃ warm water, with a bath ratio of 1:16. Add 2g / L of anti-staining soap detergent ZS-CW to the main tank, heat to 90℃ and keep warm for 15 minutes. Drain the water, add warm water, wash for 5 minutes, and then drain the water. The post-treatment adopts a positive pump circulation method from the inside to the outside.

[0025] The effect of the ash pattern in this embodiment is shown in the image below. Figure 3 As shown, according to the GB / T 250 gray sample card 5-level rating standard, the color similarity rating is 3-4.

[0026] Example 4 The method for controlling the color matching in dyeing cotton-cashmere blended yarns, aiming to achieve the same color effect in cotton-cashmere yarns, with the target sample being blue fabric, requires a whiteness ≥50 after pretreatment. The specific steps are as follows: 1) Yarn Selection: 50-count bleached cotton and cashmere blended yarn was pretreated at a laboratory level, following the procedure in step 2). The pretreated yarn was then tested for whiteness and subjected to laboratory dyeing experiments. The whiteness of the pretreated bleached cotton and cashmere blended yarn was 62, meeting the blue dyeing requirements of the target sample. Therefore, a bleached cotton and cashmere blended yarn was selected. The dyeing method was warp beam dyeing, with a warp beam density of 0.48 g / cm³. 3 ; 2) Pretreatment: Add yarn and 25°C room temperature water to the main tank at a bath ratio of 1:16. After heating to 40°C, add 0.5g / L of high-efficiency penetrating refining agent RW and 1g / L of degreasing agent TF-109H to the main tank and circulate for 3 minutes. Heat to 80°C at a heating rate of 2.5°C / min and circulate for 20 minutes. After completion, drain the liquid. Add warm water and circulate for 5 minutes. After completion, drain the liquid. The pretreatment adopts a positive pump circulation method from the inside to the outside.

[0027] 3) Dyeing: Add 25℃ room temperature water to the main tank at a bath ratio of 1:16. Add leveling agent LAR-LR 2g / L and reactive dyes Blue K-HL 0.215%, Red K-3BS 150% 0.17%, and Blue C-4R 0.64% to the main tank and keep warm for 20 minutes. Add sodium sulfate 60g / L to the main tank and keep warm for 20 minutes. Increase the temperature to 60℃ at 1℃ / min. Add soda ash to the main tank at a concentration of 5g / L and keep warm for 40 minutes, then drain the liquid. Add warm water, increase the temperature to 60℃ and keep warm for 10 minutes, then drain the liquid. Dyeing is carried out using a positive pump circulation method from the inside to the outside. 4) The post-treatment process is as follows: add warm water, with a bath ratio of 1:16, add anti-staining soap detergent ZS-CW 2g / L to the main tank, heat to 90℃ and keep warm for 15 minutes, drain, add warm water, wash for 5 minutes and drain. The post-treatment adopts a positive pump circulation method from the inside to the outside.

[0028] By weaving the yarn dyed to the same color effect in Example 4 and the yarn dyed to the heather gray effect in Example 3 in a 1:1 ratio along the warp, a third style of fabric with a texture between heather gray and the same color effect can be obtained. The effect comparison diagram is shown below. Figure 4 As shown, according to the GB / T 250 gray sample card 5-level rating standard, the color similarity rating is level 4.

[0029] Although the present invention has been described in detail by way of preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the color uniformity of dyeing cotton-cashmere blended yarns, characterized in that, This includes dyeing style analysis and raw yarn preparation, pretreatment, dyeing, and posttreatment, specifically: 1) Dyeing style analysis and raw yarn preparation: Select yarn according to the final dyeing style of the yarn and the whiteness requirement after pretreatment. For blended yarns that produce the same color effect and require a whiteness of <50 after pretreatment, use a blended yarn of raw cotton and cashmere. The blended yarn that produces the same color effect and requires a whiteness of ≥50 after pretreatment is made of bleached cotton and cashmere blended yarn. The third blended yarn that produces the ash-gray effect is made from a blend of raw cotton and cashmere. The cashmere content in blended yarns 1, 2, and 3 is ≤30%; 2) Preprocessing The first pretreatment of blended yarn uses a bio-enzyme pretreatment process; the second pretreatment of blended yarn uses a washing process with refining agent and degreasing agent; the third pretreatment of blended yarn uses a bio-enzyme pretreatment process and an oxygen bleaching pretreatment process in sequence. 3) Staining The pretreated yarn is dyed with a medium-temperature reactive dye. A dyeing leveling agent and reactive dye are added, and the mixture is kept at a temperature of 10-20 min. Then, 20-60 g / L of sodium sulfate is added, and the mixture is kept at a temperature of 20-40 min. The temperature is increased to 55-60°C at a rate of 0.8-1°C / min. Soda ash is added, with a dosage of ≤7 g / L. The mixture is kept at a temperature of 40-50 min, and then the liquid is drained. The yarn is then placed in warm water, and the temperature is increased to 60-70°C and maintained for 10-15 min. Finally, the liquid is drained. 4) Post-processing Add 1-2g / L of anti-stain soap ZS-CW to the tub at a bath ratio of 1:8-16, heat to 80-90℃ and keep warm for 15-20 minutes, drain, add warm water, rinse for 5-10 minutes and drain again.

2. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 1, characterized in that, Step 2) The pretreatment process of bio-enzyme is as follows:

1. Add room temperature water to the main tank at a bath ratio of 1:6-16. After heating to 35-45℃, add 0.5-1g / L of high-efficiency penetrating refining agent RW to the main tank and circulate for 3-5 minutes. Then add 0.5%-1%owf of refining enzyme SOFT and circulate for 3-5 minutes.

2. Increase the temperature to 55-60℃ at a heating rate of 2-2.5℃ / min and circulate for 30-40 minutes. After completion, increase the temperature to 80-85℃ at a heating rate of 2-2.5℃ / min and circulate for 30-40 minutes. After completion, drain the liquid.

3. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 1, characterized in that, Step 2) The washing process of refining agent and degreasing agent is as follows: The blended yarn and room temperature water are added to the main tank at a bath ratio of 1:6-16. After heating to 35-45°C, 0.5-1g / L of high-efficiency penetrating refining agent RW and 1-2g / L of degreasing agent TF-109H are added to the main tank and circulated for 3-5 minutes. The temperature is then increased to 80-85°C at a heating rate of 2-2.5°C / min and circulated for 20-30 minutes. After completion, the liquid is drained. Warm water is added and circulated for 5-10 minutes. After completion, the liquid is drained.

4. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 2, characterized in that, The oxygen bleaching pretreatment process is as follows: the blended yarn that has been treated with bio-enzymes in the vat is further added to the main vat at a bath ratio of 1:6-16. High-efficiency penetrating refining agent RW 0.5-1g / L and multi-effect pretreatment auxiliary agent PCC-B 1.5-2g / L are added to the main vat. After circulating and maintaining for 3-5 minutes, hydrogen peroxide 10-15g / L is added. The temperature is raised to 75-85℃ at a heating rate of 2-2.5℃ / min and circulated and maintained for 30-40 minutes. After completion, the liquid is drained. The yarn is then rinsed in warm water and circulated for 5-10 minutes. After completion, the liquid is drained.

5. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 1, characterized in that, Blended yarns 1, 2, and 3 are all in cone or beam configuration, with each cone weighing 0.9 ± 0.1 kg and having a density of 0.32-0.36 g / cm³. 3 The density of the warp shaft is 0.44-0.48 g / cm³. 3 .

6. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 2, characterized in that, The normal temperature of water is 20-30°C, and the temperature of warm water is 45-55°C.

7. The method for controlling the color uniformity of dyeing cotton-cashmere blended yarns as described in claim 1, characterized in that, Pretreatment, staining, and posttreatment all employ an inside-out positive pump circulation method.

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