Color repairing method for improving local darkness of light-color polyester fabric

Abstract

The invention provides a color retouching method for improving local darkness of a light-color polyester fabric, which comprises the following steps: (1) setting a gray cloth: carrying out setting treatment on the surface of the gray cloth by using a finishing machine to ensure that the cloth surface is fully unfolded; (2) mixing anhydrous sodium sulphate and water to obtain a first mixed solution, adding the shaped gray cloth into the first mixed solution, carrying out first operation, then adding a bleaching agent into the first mixed solution to obtain a second mixed solution, carrying out second operation on the gray cloth in the second mixed solution, and then carrying out first heating, second heating, heat preservation, cooling and post-treatment to obtain a second gray cloth; and finishing the color repairing method. According to the color repairing method provided by the invention, the anhydrous sodium sulphate and the specific bleaching agent are used as auxiliaries, so that the local darkness of the fabric is eliminated, and meanwhile, the fabric is not damaged.

Description

Technical Field

[0001] This invention belongs to the field of printing and dyeing technology, and relates to a color-correcting method for improving localized darkening of light-colored polyester fabrics. Background Technology

[0002] Light-colored fabrics, due to uneven dyeing, may exhibit darker areas compared to the properly dyed parts. Depending on the specific color, this may manifest as yellowing or graying, reducing the fabric's value. Since darkening occurs randomly, manufacturers often resort to bleaching for large areas of darkened fabric. Because bleaching agents are strong oxidizers and can damage fabrics, bleaching light-colored fabrics requires ensuring the appearance and substrate of the already dyed fabric are not damaged by the strong oxidizer while simultaneously bleaching the darker areas. This places high demands on the selection of bleaching agents and process control. Traditional hypochlorous acid bleaching agents offer good bleaching effects, but their high acidity can damage the fabric. Organic peroxides (benzene peroxide, acetone peroxide, etc.) do not harm the fabric, but their bleaching effect is limited and they are more expensive; the organic reactants left on the fabric can also cause pollution.

[0003] Therefore, in this field, there is a desire to develop a color-correcting method to improve localized darkening of light-colored fabrics. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a method for improving localized darkening of light-colored polyester fabrics. The method provided by this invention can achieve bleaching without damaging the fabric quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for improving localized darkening of light-colored polyester fabrics, the method comprising the following steps:

[0007] (1) Finishing: Use a finishing machine to finish the surface of the fabric to ensure that the fabric is fully unfolded;

[0008] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture for the first run. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for the second run. Then perform the first heating, the second heating, heat preservation, cooling, and post-treatment to complete the color correction method.

[0009] The color-correcting method provided by this invention uses sodium sulfate and a specific bleaching agent as additives to eliminate local darkening of the fabric without damaging the fabric.

[0010] Preferably, the fabric in step (1) comprises a light-colored polyester fabric.

[0011] Preferably, the temperature of the shaping process in step (1) is 190~200℃, such as 190℃, 191℃, 192℃, 193℃, 194℃, 195℃, 196℃, 197℃, 198℃, 199℃, 200℃, etc., as well as specific point values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0012] Preferably, the fabric feeding rate during the shaping process in step (1) is 10~20m / min, for example 10m / min, 11m / min, 12m / min, 13m / min, 14m / min, 15m / min, 16m / min, 17m / min, 18m / min, 19m / min, 20m / min, etc., and specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0013] Preferably, in step (2), the concentration of sodium sulfate in the first mixture is 15~25 g / L, for example 15 g / L, 16 g / L, 18 g / L, 20 g / L, 22 g / L, 23 g / L, 25 g / L, etc., and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0014] Preferably, the first run time in step (2) is 8 to 12 minutes, such as 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, etc., and specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0015] Preferably, the bleaching agent in step (2) includes hydrogen peroxide and a water softener in a mass ratio of 6:(4~5) (e.g., 6:4, 6:4.2, 6:4.4, 6:4.5, 6:4.6, 6:4.8, 6:5, etc., and specific values ​​between the above values; for the sake of brevity and space, the present invention will not exhaustively list the specific values ​​included in the range).

[0016] Preferably, the water softener includes water softener CT powder.

[0017] Preferably, in step (2), the concentration of bleach in the second mixture is 10~11 g / L, such as 10 g / L, 10.2 g / L, 10.4 g / L, 10.5 g / L, 10.6 g / L, 10.8 g / L, 11 g / L, etc., and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0018] Preferably, the second run time in step (2) is 8 to 12 minutes, such as 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, etc., and specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0019] Preferably, the first temperature rise in step (2) is to rise to 40~60℃, such as 40℃, 45℃, 50℃, 55℃, 60℃, etc., and specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0020] Preferably, the second heating in step (2) is to heat to 110~130℃, such as 110℃, 115℃, 120℃, 125℃, 130℃, etc., and specific point values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0021] Preferably, the second heating in step (2) specifically includes: heating from 40~60℃ (e.g. 40℃, 45℃, 50℃, 55℃, 60℃, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range) at a rate of 1~2℃ / min (e.g. 1℃ / min, 1.2℃ / min, 1.4℃ / min, 1.5℃ / min, 1.6℃ / min, 1.8℃ / min, 2℃ / min, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range) to 110~130℃ (e.g. 110℃, 115℃, 120℃, 125℃, 130℃, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range).

[0022] Preferably, the heat preservation in step (2) specifically includes: heat preservation at 110~130℃ (e.g., 110℃, 115℃, 120℃, 125℃, 130℃, etc., and specific values ​​between the above points; due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range) for 20~30 minutes (e.g., 20 minutes, 25 minutes, 30 minutes, etc., and specific values ​​between the above points; due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range).

[0023] Preferably, the cooling in step (2) is to cool down to 50~70℃, such as 50℃, 55℃, 60℃, 65℃, 70℃, etc., as well as specific point values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0024] Preferably, the cooling in step (2) specifically includes: cooling from 110~130℃ (e.g., 110℃, 115℃, 120℃, 125℃, 130℃, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range) to 50~70℃ (e.g., 0.5℃ / min, 1℃ / min, 1.5℃ / min, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range) at a rate of 0.5~1.5℃ / min (e.g., 0.5℃ / min, 1℃ / min, 1.5℃ / min, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range).

[0025] Preferably, the post-processing in step (2) includes washing, dehydration, fabric preparation (spreading), setting, and packaging for storage. The purpose of washing is to remove active residues from the fabric surface. The purpose of dehydration is to remove excess moisture; the fabric preparation specifically includes flattening the fabric and recycling.

[0026] Preferably, the cleaning agent used for the cleaning is water.

[0027] Preferably, the cleaning agent used for cleaning is water at 20~50℃ (e.g., 20℃, 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, etc., and specific values ​​between the above points; for the sake of space and brevity, the present invention will not exhaustively list the specific values ​​included in the range).

[0028] As a preferred embodiment of the present invention, the color correction method includes the following steps:

[0029] (1) Finishing: The surface of the greige fabric is finished using a finishing machine to ensure that the fabric is fully unfolded. The temperature of the finishing process is 190~200℃ and the feed rate is 10~20m / min.

[0030] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 8-12 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 8-12 minutes. Then raise the temperature to 40-60℃. Then raise the temperature from 40-60℃ to 110-130℃ at a rate of 1-2℃ / min. Keep the temperature at 110-130℃ for 20-30 minutes. Then lower the temperature from 110-130℃ to 50-70℃ at a rate of 0.5-1.5℃ / min. Then wash the fabric with water at 20-50℃. Dehydrate, straighten (spread) the fabric, shape, package and store it to complete the color correction method.

[0031] In the first mixture, the concentration of sodium sulfate is 15~25g / L;

[0032] The bleaching agent comprises hydrogen peroxide and a water softener in a mass ratio of 6:(4~5);

[0033] In the second mixture, the concentration of bleach is 10~11 g / L.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The color-correcting method provided by this invention uses sodium sulfate and a specific bleaching agent as additives to eliminate local darkening of the fabric without damaging the fabric. Detailed Implementation

[0036] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0037] Example 1

[0038] This embodiment provides a method for improving localized darkening of light-colored polyester fabrics, the method comprising the following steps:

[0039] (1) Finishing: The finishing machine is used to finish the surface of the greige fabric (specifically, a white polyester monofilament and CD yarn blended fabric, which has yellowed) to ensure that the fabric is fully unfolded. The finishing temperature is 195℃ and the fabric feeding rate is 15m / min.

[0040] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 10 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 10 minutes. Then raise the temperature to 50°C and raise it to 120°C at a rate of 1°C / min. Keep it at 120°C for 25 minutes. Then lower the temperature from 120°C to 60°C at a rate of 1°C / min. Then wash the fabric with water at 50°C, dehydrate, straighten (spread) the fabric, shape, package and store it in the warehouse to complete the color correction method.

[0041] In the first mixture, the concentration of sodium sulfate is 20 g / L;

[0042] The bleaching agent comprises hydrogen peroxide and a water softener (specifically, CT powder water softener) in a mass ratio of 6:4.

[0043] In the second mixture, the concentration of bleach is 10 g / L.

[0044] Example 2

[0045] This embodiment provides a method for improving localized darkening of light-colored polyester fabrics, the method comprising the following steps:

[0046] (1) Finishing: The finishing machine is used to finish the surface of the greige fabric (specifically, a blend of white polyester environmental protection monofilament (darker than polyester monofilament) and CD yarn environmental protection monofilament (darker), which has yellowed) to ensure that the fabric is fully unfolded. The finishing temperature is 190℃ and the fabric feeding rate is 10m / min.

[0047] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 8 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 12 minutes. Then raise the temperature to 40°C and raise it to 110°C at a rate of 1.5°C / min. Keep it at 110°C for 30 minutes. Then lower the temperature from 110°C to 50°C at a rate of 1.5°C / min. Then wash the fabric with water at 50°C, dehydrate, straighten (spread) the fabric, shape, package and store it in the warehouse to complete the color correction method.

[0048] In the first mixture, the concentration of sodium sulfate is 15 g / L;

[0049] The bleaching agent comprises hydrogen peroxide and a water softener (specifically, CT powder water softener) in a mass ratio of 6:5.

[0050] In the second mixture, the concentration of bleach is 11 g / L.

[0051] Example 3

[0052] This embodiment provides a method for improving localized darkening of light-colored polyester fabrics, the method comprising the following steps:

[0053] (1) Finishing: The surface of the greige fabric (specifically pure polyester monofilament) is finished using a finishing machine to ensure that the fabric surface is fully unfolded. The temperature of the finishing process is 200℃ and the feed rate is 20m / min.

[0054] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 12 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 8 minutes. Then raise the temperature to 60°C and raise it to 130°C at a rate of 2°C / min. Keep it at 130°C for 20 minutes. Then lower the temperature from 130°C to 70°C at a rate of 1°C / min. Then wash the fabric with water at 50°C, dehydrate, straighten (spread) the fabric, shape, package and store it in the warehouse to complete the color correction method.

[0055] In the first mixture, the concentration of sodium sulfate is 25 g / L;

[0056] The bleaching agent comprises hydrogen peroxide and a water softener (specifically, CT powder water softener) in a mass ratio of 6:4.

[0057] In the second mixture, the concentration of bleach is 10 g / L.

[0058] Example 4

[0059] This embodiment provides a method for improving localized darkening of light-colored polyester fabrics, the method comprising the following steps:

[0060] (1) Finishing: The finishing machine is used to finish the surface of the greige fabric (specifically, a white polyester monofilament and CD yarn blended fabric, which has yellowed) to ensure that the fabric is fully unfolded. The finishing temperature is 190℃ and the fabric feeding rate is 15m / min.

[0061] (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 10 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 8 minutes. Then raise the temperature to 45°C and raise it to 115°C at a rate of 1.5°C / min. Keep it at 115°C for 20 minutes. Then lower the temperature from 115°C to 50°C at a rate of 0.5°C / min. Then wash the fabric with water at 50°C, dehydrate, straighten (spread) the fabric, shape, package and store it in the warehouse to complete the color correction method.

[0062] In the first mixture, the concentration of sodium sulfate is 18 g / L;

[0063] The bleaching agent comprises hydrogen peroxide and a water softener (specifically, CT powder water softener) in a mass ratio of 6:5.

[0064] In the second mixture, the concentration of bleach is 11 g / L.

[0065] Comparative Example 1

[0066] The only difference between this comparative example and Example 1 is that sodium sulfate is not added in step (2).

[0067] Comparative Example 2

[0068] The only difference between this comparative example and Example 1 is that in step (2), the bleach is replaced with an equal weight of water softener, i.e., hydrogen peroxide is not added.

[0069] Comparative Example 3

[0070] The only difference between this comparative example and Example 1 is that in step (2), the bleach is replaced with an equal weight of hydrogen peroxide, i.e., no water softener is added.

[0071] The performance of the color-corrected fabrics provided in the embodiments and comparative examples of the present invention was tested using the following methods:

[0072] The fabrics before and after color correction were tested in accordance with GB / T250-2008 "Textiles - Tests for Color Fastness - Assessment of Color Change - Gray Scale".

[0073] The performance test results are shown in Table 1.

[0074] Table 1

[0075]

[0076] As can be seen from Table 1, when the color-correcting method provided by this invention is used to correct the color of the fabric, the fabric becomes whiter, reaching level 4 or above, without causing damage to the fabric.

[0077] Compared with Example 1, after the fabric was colored using the color correction methods provided in Comparative Examples 1-3, the fabric color was still too earthy and dark.

[0078] The applicant declares that this invention illustrates the method for improving localized darkening of light-colored polyester fabrics through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials used in this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

Claims

1. A method for improving localized darkening of light-colored polyester fabrics, characterized in that, The color correction method includes the following steps: (1) Finishing: The surface of the fabric is finished using a finishing machine; (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture for the first run. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for the second run. Then perform the first heating, the second heating, heat preservation, cooling, and post-treatment to complete the color correction method.

2. The color correction method according to claim 1, characterized in that, The fabric described in step (1) includes light-colored polyester fabric.

3. The color correction method according to claim 1 or 2, characterized in that, The temperature for the shaping process in step (1) is 190~200℃; Preferably, the fabric feeding rate during the shaping process in step (1) is 10~20m / min.

4. The color correction method according to any one of claims 1-3, characterized in that, In step (2), the concentration of sodium sulfate in the first mixture is 15~25 g / L; Preferably, the first run in step (2) takes 8 to 12 minutes.

5. The color correction method according to any one of claims 1-4, characterized in that, The bleaching agent in step (2) comprises hydrogen peroxide and a water softener in a mass ratio of 6:(4~5); Preferably, the water softener includes CT water softener powder; Preferably, in step (2), the concentration of bleach in the second mixture is 10~11 g / L.

6. The color correction method according to any one of claims 1-5, characterized in that, The second run in step (2) takes 8 to 12 minutes.

7. The color correction method according to any one of claims 1-6, characterized in that, The first temperature increase in step (2) is to raise the temperature to 40~60℃; Preferably, the second heating in step (2) is to raise the temperature to 110~130℃; Preferably, the second heating in step (2) specifically includes heating from 40~60℃ to 110~130℃ at a rate of 1~2℃ / min.

8. The color correction method according to any one of claims 1-7, characterized in that, The heat preservation in step (2) specifically includes: heat preservation at 110~130℃ for 20~30 minutes; Preferably, the cooling in step (2) is to cool to 50~70℃; Preferably, the cooling in step (2) specifically includes cooling from 110~130℃ to 50~70℃ at a rate of 0.5~1.5℃ / min.

9. The color correction method according to any one of claims 1-8, characterized in that, The post-processing described in step (2) includes cleaning; Preferably, the cleaning agent used for the cleaning is water; Preferably, the cleaning agent used for cleaning is water at 20~50℃.

10. A color correction method as described in any one of claims 1-9, characterized in that, The color correction method includes the following steps: (1) Finishing: The surface of the fabric is finished using a finishing machine. The temperature of the finishing process is 190~200℃ and the feed rate is 10~20m / min. (2) Mix sodium sulfate and water to obtain a first mixture. Add the shaped fabric to the first mixture and run for 8 to 12 minutes. Then add bleach to the first mixture to obtain a second mixture. Run the fabric in the second mixture for 8 to 12 minutes. Then raise the temperature to 40 to 60°C. Then raise the temperature from 40 to 60°C to 110 to 130°C at a rate of 1 to 2°C / min. Keep the temperature at 110 to 130°C for 20 to 30 minutes. Then lower the temperature from 110 to 130°C to 50 to 70°C at a rate of 0.5 to 1.5°C / min. Then wash the fabric with water at 20 to 50°C to complete the color correction method. In the first mixture, the concentration of sodium sulfate is 15~25g / L; The bleaching agent comprises hydrogen peroxide and a water softener in a mass ratio of 6:(4~5); In the second mixture, the concentration of bleach is 10~11 g / L.

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