Fabric-cover-lossless and high-color-fastness modal fabric splitting process

Abstract

The invention relates to the technical field of modal fabrics, and particularly discloses a modal fabric splitting process with lossless cloth cover and high color fastness. Comprising the following steps: S1, taking a knitted fabric of which veil contains modal, and carrying out blank fixing and singeing for later use; s2, splitting in a dye vat, carrying out MODAL dyeing, soaping and softening treatment, and then taking out of the vat; and S3, shaping the wet cloth to obtain a final finished product. Wherein in the step S2, alkali liquor is used for splitting, and the-OH concentration of the alkali liquor in a dye vat is 0.165-0.33 mol / L. According to the method, high-concentration alkali liquor is matched with high-temperature water flow scouring, and fine fluff is stripped on the surface of modal under the mechanical action and serves as a soft, glutinous and fine source; meanwhile, the fibers are swelled by the alkali liquor, an amorphous region is opened, and the accessible surface area of the dye and the number of dyeing seats are increased together with the fine fluff, so that the requirement of deep color dyeing of the modal fabric is met, the damage of the alkali splitting to equipment is relatively low, and the production and maintenance cost can be reduced.

Description

Technical Field

[0001] This invention relates to the technical field of modal fabrics, and specifically discloses a fiber opening process for modal fabrics that achieves no damage to the fabric surface and high color fastness. Background Technology

[0002] Regenerated cellulose fiber has good moisture absorption and softness. Based on its inherent properties, it undergoes chemical fiber opening treatment to increase its delicate velvet feel.

[0003] The most mature and widely used modal fiber opening process uses traditional concentrated sulfuric acid, which utilizes the hydrolysis of cellulose molecules by sulfuric acid at high temperatures to create fine cracks and fuzz along the fiber's longitudinal direction. However, this method causes significant fiber damage, carries a high risk of strength reduction, and is difficult to dye into dark colors. The newer bio-acid opening process uses a weakly acidic opening agent, which is gentler and causes less fiber damage, but is relatively more expensive. Current acid-based opening equipment is made of steel, which is not acid-resistant, significantly reducing the equipment's lifespan. Therefore, a modal fiber opening process distinct from acid-based methods is needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fiber opening process for modal fabric that is undamaged and has high color fastness.

[0005] This invention discloses a fiber-opening process for modal fabric that achieves undamaged fabric surface and high color fastness, employing the following technical solution: A fiber-opening process for modal fabric that achieves undamaged fabric surface and high colorfastness includes the following steps: S1. Take the knitted fabric containing modal yarn, and set it for later use after finishing and singeing. S2. After opening the fiber, dyeing with MODAL, washing with soap, softening treatment and then removing it from the dyeing vat. S3. The wet cloth is shaped to obtain the final product; In step S2, an alkaline solution is used for fiber opening, and the -OH concentration of the alkaline solution in the dyeing vat is 0.165-0.33 mol / L.

[0006] Preferably, in S2, the MODAL staining auxiliaries include 2-5% crosslinking agent, which contains at least two different active groups selected from dichlorotriazine and vinyl sulfone sulfate.

[0007] More specifically, the crosslinking agent is a compound with an aniline skeleton and functional groups consisting of dichlorotriazine group and vinyl sulfone sulfate group in a 1:1 ratio.

[0008] Preferably, the amount of alkali solution used is 20-40 g / L of 33 wt% caustic soda solution.

[0009] Preferably, in step S2, the temperature of the alkali solution for fiber opening is 80-90℃, and the holding time is 40-60 minutes.

[0010] Preferably, in step S2, the MODAL staining temperature is 50-60℃ and the incubation time is 30-60 min.

[0011] Preferably, in step S2, before adding the alkaline solution to open the fibers, the fabric is boiled to remove oil. The oil removal agent includes one or more of the following: oil remover, hydrogen peroxide, and alkaline solution. The oil removal temperature is 80-90℃, and the holding time is 10-15 minutes.

[0012] Preferably, the yarn composition of the modal-knitted fabric is one or more of modal, polyester / modal blended yarn, modal / polyester core-spun yarn, lyocell / modal blended yarn, and modal / viscose blended yarn.

[0013] Preferably, when the yarn composition of the cotton yarn includes polyester, the dyeing steps include first POLY dyeing and then MODAL dyeing.

[0014] Preferably, the auxiliaries for POLY staining include disperse dye, acetic acid, and sodium acetate, and the POLY staining temperature is 120-135℃, with a holding time of 30-60 minutes.

[0015] Preferably, the structure of the knitted fabric is one or more of plain weave, rib knit, and double-sided fabric.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: This invention uses a high-concentration alkaline solution combined with high-temperature water flow and mechanical action to peel off the fine fibers from the surface of modal fabric, providing a soft and delicate texture. At the same time, the alkaline solution causes the fibers to swell, opening up the amorphous areas and increasing the surface area accessible to dyes and the number of dyeing sites, along with the fine fibers. This allows modal fabrics to be dyed in darker colors. The alkaline fiber opening process causes less damage to equipment, thus reducing production and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a physical image of Example 1; Figure 2 The image shown is of the actual product in Comparative Example 1. Figure 3 The images are microscope photographs of yarn, where a) is the yarn of Example 1, b) is the yarn of Example 2, c) is the yarn of Comparative Example 1, d) is the yarn of Comparative Example 2, e) is the yarn of Comparative Example 4, and f) is the yarn of Comparative Example 5. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the invention more apparent and understandable, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 This embodiment provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 1 MODAL tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex double-sided fabric (40% polyester 50% modal 10% spandex) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 20 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 1.8% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Next, add 5% (v / v) of reactive dye, 3% (v / v) of 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0020] Example 2 This embodiment provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take a double-sided fabric of 40S / 1 polyester / MODAL10 / 90 tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex (45% polyester 45% modal 10% spandex) and perform setting and singeing on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 40 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 2.1% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Add 4.5% (v / v) of reactive dye, 3% (v / v) of 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0021] Example 3 This embodiment provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 30D MODAL polyester (77 / 23) core-spun yarn + 50D / 24F polyester yarn + 75D / 48F polyester yarn + 30D spandex double-sided fabric (53% polyester 37% modal 10% spandex) and perform setting and single-sided singeing. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 40 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 2.47% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Add 3.7% (v / v) of reactive dye, 3% (v / v) of 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0022] Example 4 This embodiment provides a fiber-opening process for plain weave fabric, the steps of which are as follows: S1. Fabric pretreatment: Take plain weave fabric of 40S / 1 polyester / MODAL10 / 90 tight yarn + 75D / 36F polyester yarn (59% modal 41% polyester) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 40 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 1.85% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Add 5.9% (v / v) of reactive dye, 3% (v / v) of 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0023] Comparative Example 1 This comparative example provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 1 MODAL tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex double-sided fabric (40% polyester 50% modal 10% spandex) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 45 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 1.8% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Next, add 5% (v / v) of reactive dye, 3% (v / v) of 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0024] Comparative Example 2 This comparative example provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take a double-sided fabric of 40S / 1 polyester / MODAL10 / 90 tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex (45% polyester 45% modal 10% spandex) and perform setting and singeing on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent to the dyeing vat, keep it at 80℃ for 15 min, then add 5 g / L of fiber opening agent TF-1501, heat to 110℃ for 100 min, and cool down to neutralize; add 2.1% (v / v) disperse dye, 0.25 g / L acetic acid, and 0.8 g / L sodium acetate, heat to 130℃ for 30 min to dye POLY, and reduce and wash; add 4.5% (v / v) reactive dye, 3% (v / v) 2,4-dichloro-6-(β-sulfonyl)aniline-s-triazine crosslinking agent, 12 g / L soda ash, and 50 g / L sodium sulfate, keep at 60℃ for 60 min to dye MODAL, and soap after completion; finally, add 9% (v / v) softening oil to soften; S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0025] Comparative Example 3 This comparative example provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 30D MODAL polyester (77 / 23) core-spun yarn + 50D / 24F polyester yarn + 75D / 48F polyester yarn + 30D spandex double-sided fabric (53% polyester 37% modal 10% spandex) and perform setting and single-sided singeing. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 40 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 2.47% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Add 3.7% (v / v) of reactive dye, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0026] Comparative Example 4 This comparative example provides a fiber-opening process for plain weave fabric, the steps of which are as follows: S1. Fabric pretreatment: Take plain weave fabric of 40S / 1 polyester / MODAL10 / 90 tight yarn + 75D / 36F polyester yarn (59% modal 41% polyester) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent to the dyeing vat and keep it at 80℃ for 15 min; add 1.85% (v / v) disperse dye, 0.25 g / L acetic acid, and 0.8 g / L sodium acetate, heat to 130℃ and keep it at 30 min to dye POLY, then reduce and wash; add 5.9% (v / v) reactive dye, 12 g / L soda ash, and 50 g / L sodium sulfate, keep it at 60℃ for 60 min to dye MODAL, then soap and wash; finally, add 9% (v / v) softening oil to soften the fibers.

[0027] S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0028] Comparative Example 5 This comparative example provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 1 MODAL tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex double-sided fabric (40% polyester 50% modal 10% spandex) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 10 g / L of 33 wt% caustic soda solution. Heat to 90℃ for 40 min, then cool to neutralize. Add 1.8% (v / v) disperse dye, 0.25 g / L acetic acid, and 0.8 g / L sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Next, add 5% (v / v) reactive dye, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0029] Comparative Example 6 This comparative example provides a fiber-opening process for double-sided fabric, the steps of which are as follows: S1. Fabric pretreatment: Take 40S / 1 MODAL tight yarn + 30D / 12F polyester yarn + 75D / 48F yarn + 30D spandex double-sided fabric (40% polyester 50% modal 10% spandex) and fix it and singe it on one side. S2, Fiber Opening: Add 1 g / L of degreasing agent, 5 g / L of hydrogen peroxide, and 1.5 g / L of 33 wt% caustic soda solution to the dyeing vat. Keep at 80℃ for 15 min, then add 20 g / L of 33 wt% caustic soda solution. Heat to 90℃ and treat for 40 min, then cool to neutralize. Add 1.8% (v / v) of disperse dye, 0.25 g / L of acetic acid, and 0.8 g / L of sodium acetate. Heat to 130℃ and keep for 30 min to dye POLY, then reduce and wash. Next, add 5% (v / v) of dichlorotriazine and vinyl sulfone-based reactive dye, 12 g / L of soda ash, and 50 g / L of sodium sulfate. Keep at 60℃ for 60 min to dye MODAL, then soap and wash. Finally, add 9% (v / v) of softening oil to soften the dye. S3. Setting: Set the wet cloth after fiber opening at 125℃ until dry.

[0030] Performance testing The examples and comparative examples were tested for bursting strength according to GB / T 19976-2005, color fastness to washing according to GB / T 3921-2008, and color fastness to rubbing according to GB / T 3920-2008, respectively. The test results are shown in Table 1.

[0031] Table 1

[0032] This method uses a high-concentration alkaline solution combined with high-temperature water jets and mechanical action to peel away the fine fibers from the Modal surface, creating a soft and delicate texture. Simultaneously, the alkaline solution causes the fibers to swell, opening up amorphous areas and increasing the surface area accessible to the dye, along with the fine fibers, thus achieving the desired darker color. However, due to the less-than-perfect bond, the fine fibers and dye can easily be carried away during subsequent friction tests, affecting colorfastness. Therefore, a cross-linking agent is added during the dyeing process to strengthen the fibers and enhance the dye's affinity for the fiber, resulting in a stronger bond and improved colorfastness. To further improve the strength of the Modal open-fiber fabric, a small amount of polyester is introduced, altering the yarn composition or structure. Polyester / Modal core-spun yarn or blended yarn acts as a skeleton, preventing small holes from appearing on the fabric surface due to a decrease in Modal strength.

[0033] Table 1 shows that the bursting strength of Examples 2 and 3 is improved compared to Example 1, indicating that the introduction of a certain amount of polyester helps the bursting strength of the modal split fabric. However, if the alkali solution in Comparative Example 1 is adjusted to 45 g / L, excessive splitting will occur, resulting in a significant decrease in the strength of the modal surface, and the fabric will have small holes approximately 12 times per roll (see Table 1). Figure 1-2 The comparison Figure 2 The red circle indicates a hole, which determines the amount of caustic soda used in alkali fiber opening.

[0034] In Comparative Example 4, the fibers were not opened, from Figure 3 The comparison of the color fastness to rubbing and the color fastness to washing shows that the color fastness of Example 4 is not worse than that of Comparative Example 4 (without open fibers), and the color depth is similar. This indicates that the fiber opening process of this solution has no adverse effect on the dyeing rate and color fastness of the fabric.

[0035] Comparative Example 2 represents the traditional acid-based fiber opening method, from Figure 3 In terms of fiber opening effect, the fiber opening effect of Comparative Example 2 is compared. Figure 3 (d) Comparison of fiber opening effect in ratio 4 ( Figure 3 (e) is better, with fine filaments appearing on the yarn surface, but not as good as the fiber opening effect of Example 2. Figure 3 (b) is better; the yarn surface of Example 2 has denser cilia (see Example 2). Figure 3 (The part shown in the red box in the middle) illustrates that the traditional acidic fiber opening method is not as effective as the alkaline fiber opening method of this solution. In addition, judging from the results of rubbing fastness and washing fastness, although the soap fastness of the results obtained by Comparative Example 2 is slightly better than that of Example 2, this is because the color of the fabric dyed by Comparative Example 2 is lighter than that of Example 2. However, this does not mean that the darker the color, the worse the fastness. The examples listed in this solution are all darker in color. On the contrary, it can be proved that under the premise of the same dye content and the same dyeing process, the dye uptake rate of Comparative Example 2 using acidic fiber opening is not as high as that of the example of alkaline fiber opening method of this invention, and the color yield is lower.

[0036] Although Comparative Example 3 also used the alkaline solution fiber opening method and had a bursting strength comparable to the Example, it did not use a crosslinking agent, resulting in extremely poor color fastness after fiber opening. Comparative Example 5 reduced the alkaline solution concentration by 10 g / L, achieving a bursting strength similar to Example 1, but also resulted in poor fiber opening performance (see...). Figure 3 f) is far less effective than the fiber-opening effect of Example 1 (see f) Figure 3 a) Excellent, but due to insufficient fiber opening, the dyeing rate and color fastness are low. It is evident that decreasing the alkali concentration worsens the fiber opening effect of Modal and is unfavorable for dyeing dark colors. Increasing the alkali concentration improves the fiber opening effect of Modal fabric, but it is detrimental to the color fastness of dark colors and the bursting strength of the fabric. In other words, it is difficult to achieve optimal fiber opening effect, color fastness, and fabric strength simultaneously. This solution, through the organic combination of "high-concentration alkali fiber opening + dual-active-group crosslinking agent," not only ensures good color fastness and good dyeing rate for dark fabrics without fading, but also guarantees a good fiber-opened fabric style and maintains good bursting strength, preventing fabric holes.

[0037] Furthermore, although Comparative Example 6 uses a bifunctional reactive dye containing the same crosslinking agent instead of a common reactive dye for dyeing, this type of dye has a chromophore group and large steric hindrance, thus lacking crosslinking effect. This indicates that the crosslinking agent in this scheme plays an extremely important role in the alkali-opening fiber dyeing process for dark colors.

[0038] The technical solution provided by the invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the invention. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A fiber-opening process for modal fabric that achieves undamaged fabric surface and high color fastness, characterized in that, Includes the following steps: S1. Take the knitted fabric containing modal yarn, and set it for later use after finishing and singeing. S2. After opening the fiber, dyeing with MODAL, washing with soap, softening treatment and then removing it from the dyeing vat. S3. The wet cloth is shaped to obtain the final product; In step S2, an alkaline solution is used for fiber opening, and the -OH concentration of the alkaline solution in the dyeing vat is 0.165-0.33 mol / L.

2. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, In S2, the MODAL staining auxiliaries include 2-5% crosslinking agent, which contains at least two different active groups selected from dichlorotriazine and vinyl sulfone sulfate.

3. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, The amount of alkali solution used is 20-40 g / L of 33wt% caustic soda solution.

4. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, In step S2, the temperature of the alkali solution for fiber opening is 80-90℃, and the holding time is 40-60 minutes.

5. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, In S2, the MODAL staining temperature is 50-60℃ and the incubation time is 30-60min.

6. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, In step S2, before adding alkaline solution to open the fibers, the fabric is boiled to remove oil. The oil removal agent includes one or more of the following: oil remover, hydrogen peroxide, and alkaline solution. The oil removal temperature is 80-90℃, and the holding time is 10-15 minutes.

7. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, The yarn composition of the knitted fabric containing modal is one or more of modal, polyester / modal blended yarn, modal / polyester core-spun yarn, lyocell / modal blended yarn, and modal / viscose blended yarn.

8. The fabric opening process with undamaged fabric surface and high color fastness according to claim 7, characterized in that, When the yarn composition of cotton yarn includes polyester, the dyeing process includes first POLY dyeing and then MODAL dyeing.

9. The fabric opening process with undamaged fabric surface and high color fastness according to claim 8, characterized in that, The auxiliaries for POLY staining include disperse dye, acetic acid, and sodium acetate. The POLY staining temperature is 120-135℃, and the holding time is 30-60 minutes.

10. The fabric opening process with undamaged fabric surface and high color fastness according to claim 1, characterized in that, The structure of the knitted fabric is one or more of plain weave, rib knit, and double-sided fabric.

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