Dyeing method of cotton-polyester interwoven fabric

Abstract

The invention discloses a cotton-polyester interwoven fabric dyeing method, comprising sequentially subjecting the cotton-polyester interwoven fabric to enzyme desizing, alkaline oxygen cold stacking, bleaching, shaping, overflow dyeing, singeing, mercerizing, long-machine dyeing and post-finishing to obtain a finished product. The invention has the characteristics of improving dyeing uniformity, dyeing rate and color fastness.

Description

Technical Field

[0001] The invention relates to a dyeing method, in particular to a cotton-polyester interwoven fabric dyeing method. Background Art

[0002] Cotton-polyester interwoven fabric is a fabric whose warp is cotton and whose weft is polyester filament, that is, the front side of the cotton-polyester interwoven fabric is cotton fiber and the back side is polyester fiber. The existing Chinese patent with publication number CN115491837A discloses a cotton-polyester fabric dyeing process, including S1, grey cloth preparation; S2, washing; S3, drying; S4, opening; S5, singeing; S6, desizing; S7, scouring; S8, bleaching; S9, dyeing; S10, mercerizing; S11, finishing. It reduces impurities on the grey cloth and has the function of improving the dyeing effect of the cotton-polyester fabric.

[0003] The dyeing process adopts the steps of first singeing and then desizing and bleaching. Although the surface finish of the fabric after singeing is high, the bleaching process can be carried out on the smooth fabric surface, making the bleaching effect more uniform and the whiteness higher. However, since the polyester filaments will be contaminated with spinning oil during the spinning process, if the polyester filaments are first singed and then desizing and bleaching are carried out, the spinning oil is likely to penetrate into the cotton fibers during the singeing process, resulting in the subsequent fabric dyeing being mottled and uneven.

[0004] Moreover, the singeing process of cotton-polyester interwoven fabrics generally uses a natural gas pressure of 12-15 bar, a vehicle speed of 90-100 m / min, and a burner temperature of 1000-1100°C. The singeing temperature is relatively high, and polyester is prone to high-temperature melting and curling after singeing, making the fabric hard and brittle, and uneven, which makes it difficult to dye the dye during subsequent fabric dyeing, reduces the dyeing rate, and aggravates the stripe-like defects on the fabric surface.

[0005] The dyeing is generally done by vat dyeing or long-machine dyeing. If vat dyeing is used, the friction is large, which can easily cause the fabric to become more frizzy and wrinkled, resulting in the fabric surface being less smooth and the dyeing being less uniform. If long-machine dyeing is used, the fabric surface will become hard, the feel will deteriorate, and the color fastness will be poor. Summary of the invention

[0006] The purpose of the present invention is to provide a method for dyeing cotton-polyester interwoven fabrics. The present invention has the characteristics of improving dyeing uniformity, dye uptake and color fastness.

[0007] The technical solution of the present invention is a method for dyeing cotton-polyester interwoven fabrics, which comprises subjecting the cotton-polyester interwoven fabrics to enzyme desizing, alkaline oxygen cold stacking, bleaching, shaping, overflow dyeing, singeing, mercerizing, long-machine dyeing and post-finishing in sequence to obtain a finished product.

[0008] In the aforementioned cotton-polyester interwoven fabric dyeing method, in the enzyme desizing step, the vehicle speed is 70-75 m / min, and the steamer stacking temperature is 70-75°C.

[0009] In the aforementioned cotton-polyester interwoven fabric dyeing method, in the alkali-oxygen cold stacking step, the vehicle speed is 60-65m / min, the material is rolled at room temperature, and stacked at 30-35°C for 20-24h, wherein the dosage concentration of caustic soda is 23-30g / L, and the dosage concentration of hydrogen peroxide is 6-7g / L.

[0010] In the aforementioned cotton-polyester interwoven fabric dyeing method, in the bleaching step, the vehicle speed is 65-70 m / min, the steamer stacking temperature is 95-97° C., and the dosage concentration of hydrogen peroxide is 5-6 g / L.

[0011] In the aforementioned cotton-polyester interwoven fabric dyeing method, in the mercerizing step, the vehicle speed is 50-60 m / min, and the dosage concentration of caustic soda is 200-220 g / L.

[0012] In the aforementioned cotton-polyester interwoven fabric dyeing method, the overflow dyeing uses disperse dyes; and the long-bed dyeing uses reactive dyes.

[0013] In the aforementioned cotton-polyester interwoven fabric dyeing method, the singeing process parameters are: natural gas pressure of 5-8 bar, vehicle speed of 105-115 m / min, and burner temperature of 800-900°C.

[0014] In the aforementioned cotton-polyester interwoven fabric dyeing method, the singeing process parameters are: natural gas pressure of 6 bar, vehicle speed of 110 m / min, and burner temperature of 850°C.

[0015] In the aforementioned cotton-polyester interwoven fabric dyeing method, the singeing is performed by singeing the front side 1 to 3 times.

[0016] In the aforementioned cotton-polyester interwoven fabric dyeing method, the post-finishing includes softening finishing and pre-shrinking finishing. In the softening finishing, the machine speed is 60-70 m / min and the drying temperature is 140-150° C.; in the pre-shrinking finishing, the machine speed is 40-50 m / min.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The invention firstly performs bleaching to remove impurities such as spinning oil on the polyester, and then performs overflow dispersion dyeing and singeing on the polyester to prevent the spinning oil from penetrating into the cotton fiber, so that the subsequent dyeing of the polyester and cotton is more comprehensive and uniform.

[0019] The invention adopts overflow disperse dyeing of polyester first and then singeing and mercerizing, which effectively avoids the damage of polyester due to singeing first, and the influence of subsequent dyeing uniformity and dyeing rate of polyester due to melting, discoloration and hardening of polyester, and the cloth surface is cleaner, and the stripe phenomenon is avoided, and the color fastness is improved; and the fuzz on the cotton fiber and the fluff and wrinkles on the fabric caused by friction in the previous overflow dyeing are removed by singeing and mercerizing, so as to improve the flatness and glossiness of the fabric and facilitate the subsequent dyeing treatment; and the overflow dyeing has good permeability and high dyeing color fastness.

[0020] The invention performs long-machine active dyeing of cotton after singeing and mercerizing. After the singeing and mercerizing finishing, the fabric is smoother and flatter, the crystal area of ​​the fiber is reduced, and the amorphous area is increased. Therefore, when long-machine dyeing is performed, the dyeing is more uniform, the active dye is easier to enter the interior of the cotton fiber, the coloring rate is increased, the fabric stability and the bad hand feel caused by singeing are improved, wrinkles of the fabric are avoided during dyeing, and the stiffness of the fabric after dyeing is improved.

[0021] Therefore, the present application adopts the method of first overflow disperse dyeing polyester, then singeing and mercerizing, and then long-machine active dyeing of cotton, and combines the two dyeing processes to effectively improve the overall dyeing uniformity, dyeing rate and crispness of the cotton-polyester interwoven fabric, and improve the quality of the fabric surface; the soap washing color fastness level of the cotton-polyester interwoven fabric is: medium light color 4-5 level, medium dark color 4 level, extra dark color 3-4 level, and high color fastness. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments, but they are not intended to limit the present invention.

[0023] Example:

[0024] The cotton-polyester interwoven fabric dyeing method comprises the following steps:

[0025] The cotton-polyester interwoven fabric is sequentially subjected to enzyme desizing, alkaline oxygen cold stacking, bleaching, shaping, overflow disperse dyeing of polyester, secondary singeing on the front side, mercerizing, long-machine active dyeing of cotton and post-finishing to obtain the finished product.

[0026] In the enzyme desizing step, the vehicle speed is 70-75 m / min, and the steamer stacking temperature is 70-75°C.

[0027] In the alkali oxygen cold stacking step, the vehicle speed is 60-65 m / min, the material is rolled at room temperature, and the material is stacked at 30-35° C. for 20-24 hours, wherein the concentration of caustic soda is 23-30 g / L, and the concentration of hydrogen peroxide is 6-7 g / L.

[0028] In the bleaching step, the vehicle speed is 65-70 m / min, the steamer stacking temperature is 95-97° C., and the dosage concentration of hydrogen peroxide is 5-6 g / L.

[0029] In the mercerizing step, the vehicle speed is 50-60 m / min, and the concentration of caustic soda is 200-220 g / L.

[0030] The post-finishing includes softening finishing and pre-shrinking finishing. During the softening finishing, the machine speed is 60-70 m / min and the drying temperature is 140-150° C.; during the pre-shrinking finishing, the machine speed is 40-50 m / min.

[0031] The invention firstly performs bleaching to remove impurities such as spinning oil on the polyester, and then performs overflow dispersion dyeing and singeing on the polyester to prevent the spinning oil from penetrating into the cotton fiber, so that the subsequent dyeing of the polyester and cotton is more comprehensive and uniform.

[0032] The invention adopts overflow disperse dyeing of polyester first, and then singeing and mercerizing, which effectively avoids the damage of polyester due to singeing first, and the influence of subsequent dyeing uniformity and coloring rate of polyester on melting, discoloration and hardening of polyester, and the cloth surface is cleaner, and the stripe phenomenon is avoided, and the color fastness is improved; and the fluff on the cotton fiber and the fluff and wrinkles on the fabric caused by friction in the previous overflow dyeing are removed by singeing and mercerizing, so as to improve the flatness and glossiness of the fabric and facilitate the subsequent dyeing treatment; and the overflow dyeing adopts disperse dyes, which has good permeability, the dyeing temperature of light color is 110-120°C, the dyeing temperature of dark color is 130°C, and the dyeing color fastness is high.

[0033] The invention uses a long-machine active dyeing method after singeing and mercerizing. After the singeing and mercerizing finishing, the fabric is smoother and flatter, the crystal region of the fiber is reduced, and the amorphous region is increased. Therefore, when the long-machine dyeing is performed at a speed of 50-60 m / min, the dyeing is more uniform, the active dye can more easily enter the interior of the cotton fiber, the coloring rate is increased, the fabric stability and the bad hand feel caused by singeing are improved, wrinkles of the fabric are avoided during dyeing, and the stiffness of the fabric after dyeing is improved.

[0034] Therefore, the present application adopts the method of first overflow disperse dyeing polyester, then singeing and mercerizing, and then long-machine active dyeing of cotton, and combines the two dyeing processes to effectively improve the overall dyeing uniformity, dyeing rate and crispness of the cotton-polyester interwoven fabric, thereby improving the quality of the fabric.

[0035] The invention adopts secondary singeing on the front side, which can completely remove the lint on the cotton fiber, make the cloth surface smooth, improve the subsequent color fastness and dyeing uniformity, and cause less damage to the polyester on the back side.

[0036] The natural gas pressure used in singeing is 5-8bar, the vehicle speed is 105-115m / min, and the burner temperature is 800-900℃. Preferably, the natural gas pressure is 6bar, the vehicle speed is 110m / min, and the burner temperature is 850℃. Reducing the natural gas pressure, reducing the burner temperature, and increasing the vehicle speed can reduce the singeing intensity, reduce the sublimation of disperse dyes, greatly reduce the degree of damage to polyester, reduce the melting of polyester, and will not affect the color change of subsequent polyester dyeing, thereby reducing the stripes and discoloration caused by polyester singeing damage, so that the fabric has a high coloring rate, uniform color, soft and comfortable hand feel, and improves the multi-fiber color fastness and quality of the fabric.

[0037] After testing, the cotton-polyester interwoven fabrics prepared by the method have the following color fastness grades to soap washing: medium-light color 4-5, medium-dark color 4, and extra-dark color 3-4.

[0038] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for dyeing cotton-polyester interwoven fabrics, characterized in that: The method comprises the following steps: subjecting the cotton-polyester interwoven fabric to enzyme desizing, alkaline oxygen cold stacking, bleaching, shaping, overflow dyeing, singeing, mercerizing, long-machine dyeing and post-finishing in sequence to obtain a finished product.

2. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: In the enzyme desizing step, the vehicle speed is 70-75 m / min, and the steamer stacking temperature is 70-75°C.

3. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: In the alkali oxygen cold stacking step, the vehicle speed is 60-65 m / min, the material is rolled at room temperature, and the material is stacked at 30-35° C. for 20-24 hours, wherein the concentration of caustic soda is 23-30 g / L, and the concentration of hydrogen peroxide is 6-7 g / L.

4. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: In the bleaching step, the vehicle speed is 65-70 m / min, the steamer stacking temperature is 95-97° C., and the dosage concentration of hydrogen peroxide is 5-6 g / L.

5. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: In the mercerizing step, the vehicle speed is 50-60 m / min, and the concentration of caustic soda is 200-220 g / L.

6. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: The overflow dyeing adopts disperse dyes; the long carriage dyeing adopts reactive dyes.

7. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: The process parameters of singeing are: natural gas pressure of 5-8 bar, vehicle speed of 105-115 m / min, and burner temperature of 800-900°C.

8. The cotton-polyester interwoven fabric dyeing method according to claim 7, characterized in that: The singeing process parameters are: natural gas pressure of 6 bar, vehicle speed of 110 m / min, and burner temperature of 850°C.

9. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: The singeing is performed by singeing the front side 1 to 3 times.

10. The cotton-polyester interwoven fabric dyeing method according to claim 1, characterized in that: The post-finishing includes softening finishing and pre-shrinking finishing. During the softening finishing, the machine speed is 60-70 m / min and the drying temperature is 140-150° C.; during the pre-shrinking finishing, the machine speed is 40-50 m / min.