Dyeing and finishing method of cotton and wool blended fabric

Abstract

The invention relates to a dyeing and finishing method of a cotton and wool blended fabric. The dyeing and finishing method comprises the following steps: sequentially dyeing, napping, polar fleece and shaping a cotton and wool blended fabric blank to obtain a finished fabric, by adding the polar fleece process and optimizing the process parameters of each process, the shrinkage problem of the fabric is obviously improved, the transverse shrinkage rate is preferably as low as-1.0% or below, and the straight shrinkage rate is preferably as low as-3.2% or below, so that the fabric is fluffy and dense but not easy to slip; the dyeing and finishing method is simple in operation process, low in equipment requirement and environmentally friendly, and discharge of a large amount of treated wastewater is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, in particular to a dyeing and finishing method for a cotton-wool blended fabric, and in particular to a dyeing and finishing method for improving the shrinkage of a cotton-wool blended fabric. Background Art

[0002] Wool is a natural protein fiber with the advantages of soft texture, elasticity, good hand feel and good warmth retention. Wool products have good moisture absorption, warmth retention and skin-friendliness. High-end suits, trousers and other clothing are made of wool as raw materials. However, due to the characteristics of wool and the presence of scales, wool fibers have special shrinkage properties. They are easy to shrink and deform after absorbing water during washing, and the friction between wool scales and other fibers is easy to produce felting reaction, which is easy to pilling when worn. Cotton fabrics are composed of plant fibers. When the fabric is infiltrated, water molecules will enter the cotton fibers, causing the fibers to swell. When the fabric swells and becomes thicker in the weft direction (or radial direction), the fabric will shrink.

[0003] Shrinkage of wool and cotton fabrics is a common problem, mainly due to the characteristics of wool and cotton fibers themselves and the processing effects during the textile process. However, since high temperature will burn wool flakes or cotton fabrics, high temperature treatment and high temperature shaping, iron-free processes cannot be performed, so that there is no warm and smooth and delicate effect. Therefore, in order to improve the shrinkage of cotton and wool blended fabrics, researchers have developed low-shrinkage treatment methods. For example, CN106988072A discloses a low-shrinkage treatment method and a finishing method for a high-elastic fabric, which is added after pre-shrinking. Loose washing (low tension washing)-dehydration-opening-drying-pre-shrinking again, it adds several procedures between two pre-shrinking, and the washing water treatment produces more waste water, which seriously increases the production and processing costs.

[0004] CN110016769A discloses a low-shrinkage treatment method and a post-finishing method and device, which adopts a continuous low-shrinkage treatment process. The current equipment cannot complete the process described in the scheme on one machine, and new equipment needs to be purchased again, which increases the equipment cost. The shrinkage phenomenon is limited, and there is still a lot of room for improvement.

[0005] Therefore, for cotton-wool blended fabrics, how to develop a dyeing and finishing method that can improve its shrinkage rate and ensure that the dyeing and finishing process is simple, the equipment requirements are low and the processing cost is low is a problem that needs to be urgently solved in this field. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a dyeing and finishing method for cotton and wool blended fabrics, which significantly improves the shrinkage problem of such fabrics and makes the fabrics fluffy and dense without losing hair easily; moreover, the dyeing and finishing method has a simple operation process and low requirements on equipment, and provides a reference idea for the dyeing and finishing process of a large number of wool and / or cotton products.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The invention provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method comprises the steps of dyeing, napping, shaking and shaping the cotton-wool blended fabric blank in sequence to obtain the finished fabric.

[0009] The dyeing and finishing method of the present invention is aimed at cotton-wool blended fabric blanks. On the basis of traditional dyeing, napping and shaping processes, a graining process is added between the napping and shaping processes. The synergistic effect of each process significantly improves the shrinkage of the cotton-wool blended fabric. The graining process: on the one hand, stretches and relaxes the fibers in the cotton-wool blended fabric blank to a certain extent, releases the internal stress accumulated in the fabric blank during the previous processing, thereby reducing shrinkage; on the other hand, the fibers are entangled and grained with each other to form a stable structure, which limits the free movement of the fibers in the subsequent processing, thereby reducing the possibility of shrinkage; and also makes the fabric fibers more evenly distributed in the fabric, which helps to improve the overall stability of the fabric, thereby reducing shrinkage.

[0010] It is worth noting that the dyeing and finishing method of the present invention does not impose any restrictions on the ratio of wool to cotton in the cotton-wool blended fabric. It can be pure cotton or pure wool, or a blend of wool and cotton in any proportion, or a blend of cotton, wool and other fabric components, preferably 60% to 80% cotton (for example, 60%, 65%, 70%, 75% or 80%, etc.) and 20% to 40% wool (for example, 20%, 25%, 30% or 40%, etc.).

[0011] Preferably, during the dyeing process, the bath ratio of the cotton-wool blended fabric blank to the dyeing solution is 1:(10-15), for example, it can be 1:10, 1:11, 1:12, 1:13, 1:14 or 1:15.

[0012] It is worth noting that, considering the stress problem of cotton-wool blended fabrics during dyeing and finishing, the dyeing described in the present invention is carried out in a high-temperature overflow dyeing machine (a high bath ratio, low tension drum pull-down type that is not prone to wrinkles), which can effectively reduce the tension of the fabric during dyeing, so that the fabric is in a relaxed state, avoiding fiber elongation, plastic deformation, and shrinkage of the fabric.

[0013] Preferably, the dyeing solution comprises yellow reactive dye, red reactive dye, blue reactive dye, anhydrous sodium sulfate and sodium carbonate.

[0014] Preferably, the dyeing solution comprises 0.1 wt% to 0.5 wt% of yellow reactive dye, 0.1 wt% to 0.5 wt% of red reactive dye, 0.1 wt% to 2 wt% of blue reactive dye, 5 to 20 g / L of anhydrous sodium sulfate and 5 to 15 g / L of sodium carbonate.

[0015] Among them, 0.1wt% to 0.5wt% of yellow reactive dye can be, for example, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt% or 0.5wt%; 0.1wt% to 0.5wt% of red reactive dye can be, for example, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt% or 0.5wt%; 0.1wt% to 2wt% of blue reactive dye can be, for example, 0.1wt% to 2wt% of blue reactive dye. %, 0.5wt%, 0.8wt%, 1wt%, 1.2wt%, 1.5wt%, 1.8wt% or 2wt% etc.; 5-20g / L anhydrous sodium sulfate, for example, can be 5g / L, 8g / L, 10g / L, 12g / L, 15g / L, 18g / L or 20g / L etc.; 5-15g / L sodium carbonate, for example, can be 5g / L, 8g / L, 10g / L, 12g / L or 15g / L etc.

[0016] It is worth noting that the yellow reactive dye used in the present invention is Jagersuo Fast Yellow HF-NP, the red reactive dye is Jagersuo Fast Red BF-RL, and the blue reactive dye is Jagersuo Fast Blue HF-BR, but it is not limited thereto, and other dyes of the same color can also be used.

[0017] Preferably, the dyeing temperature is 60-65°C, for example, 60°C, 61°C, 62°C, 63°C, 64°C or 65°C.

[0018] Preferably, the dyeing time is 30 to 60 min, for example, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min or 60 min.

[0019] The present invention further prefers that the dyeing temperature is 60-65°C and the dyeing time is 30-60 minutes. On the basis of ensuring uniform dyeing, it prevents the temperature from being too high or the time from being too long, which may cause significant changes in the internal fiber structure of the cotton-wool blended fabric and increase the elastic deformation of the fiber. When the fabric comes into contact with water, the elastic deformation is restored, resulting in shrinkage.

[0020] Preferably, after the dyeing, the dyed cotton-wool blended fabric blank is softened before the napping is performed.

[0021] The present invention further preferably performs a softening treatment on the dyed cotton-wool blended fabric blank after dyeing and then performs the napping treatment. The softening treatment can, on the one hand, improve the relatively hard feel of the cotton-wool blended fabric blank after washing; on the other hand, it can make the cotton-wool blended fabric blank smooth, thereby alleviating the shrinkage of the fabric; in addition, the softener can also play the role of a napping agent, thereby ensuring the stability of the subsequent napping process.

[0022] Preferably, the softener used in the softening treatment includes CMK-815A softener (Kunshan Mingjia Additive Co., Ltd.).

[0023] Preferably, the mass concentration of the softener used in the softening treatment is 1.0% to 3.0%, for example, it can be 1.0%, 1.5%, 1.8%, 2.0%, 2.2%, 2.5%, 2.8% or 3.0%.

[0024] Preferably, the cloth feeding speed during the napping is 10-15 m / min, for example, it can be 10 m / min, 11 m / min, 12 m / min, 13 m / min, 14 m / min or 15 m / min.

[0025] Preferably, the cloth delivery speed during the napping is 2 to 5 m / min, for example, it can be 2 m / min, 2.5 m / min, 3 m / min, 3.5 m / min, 4 m / min, 4.5 m / min or 5 m / min.

[0026] Preferably, the tension of the cotton-wool blended fabric blank during napping is 1-3N, for example, 1N, 1.5N, 2N, 2.5N or 3N.

[0027] The present invention further preferably has a tension of 1 to 3N when napping the cotton-wool blended fabric blank, to ensure that the fibers are not excessively stretched or squeezed, thereby reducing damage to the fibers and reducing shrinkage. If the tension of the cotton-wool blended fabric blank is too high when napping, the fibers will be overstretched and in a higher strain state, thereby increasing shrinkage when exposed to water. If the tension of the cotton-wool blended fabric blank is too low when napping the fabric, the fabric structure will be loose and more susceptible to shrinkage when exposed to water.

[0028] Preferably, the proportion of straight needles during the napping is 1% to 1.8%, for example, 1%, 1.2%, 1.4%, 1.6% or 1.8%; the proportion of curved needles is 0% to 1.2%, for example, 0%, 0.2%, 0.5%, 0.8%, 1% or 1.2%, etc.

[0029] Preferably, the drum speed of the napping machine during napping is 150-155 m / min, for example, it can be 150 m / min, 151 m / min, 152 m / min, 153 m / min, 154 m / min or 155 m / min.

[0030] Preferably, the polarization comprises sequentially subjecting the napped cotton-wool blended fabric blank to steam heating, hot air drying and cold air cooling.

[0031] Preferably, the steam temperature of the steam heating is 80-100°C, for example, 80°C, 85°C, 90°C, 95°C or 100°C.

[0032] Preferably, the steam heating time is 5 to 8 minutes, for example, 5 minutes, 6 minutes, 7 minutes or 8 minutes.

[0033] The present invention further preferably sets the steam temperature of the steam heating to 80-100° C. and the steam heating time to 5-8 min, which is beneficial to improving the firmness and fluffiness of the granulation and improving the shrinkage problem of the fabric; if the steam temperature is too low or the steam heating time is too short, the granulation effect will be unsatisfactory, and the fibers will not be fully relaxed and fixed, resulting in the shrinkage phenomenon that is still difficult to solve; if the steam temperature is too high or the steam heating time is too long, the fibers will be damaged, thereby affecting the feel and softness, and the fibers may be overly relaxed, which will increase the risk of shrinkage.

[0034] Preferably, the hot air temperature of the hot air drying is 70-80°C, for example, 70°C, 72°C, 75°C, 78°C or 80°C.

[0035] Preferably, the hot air drying is performed 4 to 6 times, for example, 4 times, 5 times or 6 times, and the single drying time is 5 to 10 minutes, for example, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes or 10 minutes.

[0036] Preferably, the cold air temperature of the cold air cooling is 30-40°C, for example, it can be 30°C, 32°C, 35°C, 38°C or 40°C.

[0037] Preferably, the cooling time of the cold wind is 8 to 15 minutes, for example, it can be 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes or 15 minutes.

[0038] Preferably, the shaping is carried out in an open width shaping machine.

[0039] Preferably, the shaping temperature is 120-140°C, for example, 120°C, 125°C, 130°C, 135°C or 140°C.

[0040] Preferably, the standardized vehicle speed is 15-20 m / min, for example, it can be 15 m / min, 16 m / min, 17 m / min, 18 m / min, 19 m / min or 20 m / min.

[0041] Preferably, the overfeeding ratio during shaping is 10% to 15%, for example, 10%, 11%, 12%, 13%, 14% or 15%.

[0042] Preferably, the process further comprises adding a regulating acid to the cotton-wool blended fabric blank after the polarization before the shaping.

[0043] The purpose of adding the regulating acid in the present invention is to neutralize the alkali in the dyeing solution and make the pH of the finished fabric meet the pH requirement (4 to 7.5).

[0044] Preferably, the regulating acid comprises Sirrix NE liq (Archroma Chemicals (China) Co., Ltd.).

[0045] Preferably, the added mass concentration of the regulating acid is 0.01-5%, for example, it can be 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc.

[0046] As a further preferred technical solution of the present invention, the dyeing and finishing method comprises the following steps:

[0047] The cotton-wool blended fabric blank is first dyed at 60-65°C and a bath ratio of 1:(10-15) for 30-60 minutes; then a softener with a mass concentration of 1.0%-3.0% is used for softening; then napping is performed at a forward speed of 10-15m / min and a cloth output speed of 2-5m / min; during the napping, the tension of the cotton-wool blended fabric blank is 1-3N, the straight needle ratio is 1-1.8%, the curved needle ratio is 0-1.2%, and the roller speed of the napping machine is 150-155m / min; then the napped cotton-wool blended fabric is The blank is subjected to shaking, and the shaking includes firstly using a steam temperature of 80-100°C for steam heating for 5-8 minutes, then using a hot air of 70-80°C for hot air drying for 4-6 times, and a single drying time is 5-10 minutes, and using a cold air of 30-40°C for cold air cooling for 8-15 minutes; and adding a regulating acid with a mass concentration of 0.01%-5% to the cotton-wool blended fabric blank after the shaking; and finally shaping at 120-140°C, a vehicle speed of 15-20m / min and an overfeed ratio of 10%-15% to obtain a finished fabric.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] The dyeing and finishing method of the cotton-wool blended fabric provided by the present invention adds a shaking process between the napping and shaping processes on the basis of the traditional dyeing, napping and shaping processes, so that the cotton-wool blended fabric is pre-shrunk before shaping, the fiber structure is more stable, and the internal stress is released; the method cooperates with other processes to improve the shrinkage phenomenon of the cotton-wool blended fabric, and the transverse shrinkage rate is as low as below -1.0%, and the vertical shrinkage rate is as low as below -3.2%, where "-" represents shrinkage; the fabric is also made fluffy and dense but not easy to pilling, providing a reference idea for the dyeing and finishing treatment of a large number of wool and / or cotton products. DETAILED DESCRIPTION

[0050] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0051] The cotton-wool blended fabrics described in the following examples and comparative examples contain 30% wool and 70% cotton; the softener used is Sinsofter CMK-815A softener (Kunshan Mingjia Additive Co., Ltd.), and the regulating acid is Sirrix NE liq (Archroma Chemicals (China) Co., Ltd.).

[0052] 1. Implementation

[0053] Example 1

[0054] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric, the dyeing and finishing method comprising the following steps:

[0055] The cotton-wool blended fabric blank is first dyed at 62°C and a bath ratio of 1:12 for 45 minutes; then softened with a Sinsofter CMK-815A softener with a mass concentration of 2.0%; then napped at a forward speed of 12m / min and a cloth output speed of 3.5m / min; during napping, the tension of the cotton-wool blended fabric blank is 2N, the straight needle ratio is 1.5%, the curved needle ratio is 0.8%, and the drum speed of the napping machine is 153m / min; then the napped cotton-wool blended fabric blank is polarized, and the polarization includes first using a steam temperature of 90°C for steam heating for 6 minutes, then using a hot air of 70°C for hot air drying for 5 times, and the single drying time is 8 minutes, and using a cold air of 40°C for cold air cooling for 10 minutes; and adding a regulating acid (Sirrix NE liq); and finally, the finished fabric was shaped at 130° C., a speed of 18 m / min and an overfeed ratio of 12%.

[0056] The dyeing solution used in the dyeing described in this embodiment is 0.2wt% of Jagersul Fast Yellow HF-NP, 0.4wt% of Jagersul Fast Red BF-RL, 0.1wt% of Jagersul Fast Blue HF-BR, 5g / L of anhydrous sodium sulfate and 5g / L of sodium carbonate.

[0057] Example 2

[0058] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric, the dyeing and finishing method comprising the following steps:

[0059] The cotton-wool blended fabric blank is first dyed at 60°C and a bath ratio of 1:10 for 60 minutes; then softened with a Sinsofter CMK-815A softener with a mass concentration of 1.5%; then napped at a forward speed of 10m / min and a cloth output speed of 2m / min; during napping, the tension of the cotton-wool blended fabric blank is 1N, the straight needle ratio is 1%, the curved needle ratio is 1.2%, and the drum speed of the napping machine is 150m / min; then, the napped cotton-wool blended fabric blank is subjected to polarization, and the polarization includes firstly steam heating at a steam temperature of 100°C for 5 minutes, then hot air drying at 80°C for 4 times, and a single drying time is 5 minutes, and cold air cooling at 30°C for 8 minutes; and a regulating acid (Sirrix NE liq); and finally, the finished fabric was shaped at 120° C., 15 m / min, and 10% overfeed ratio.

[0060] The dyeing solution used in the dyeing described in this embodiment is 0.3wt% of Jagersul Fast Yellow HF-NP, 0.2wt% of Jagersul Fast Red BF-RL, 0.3wt% of Jagersul Fast Blue HF-BR, 15g / L of anhydrous sodium sulfate and 10g / L of sodium carbonate.

[0061] Example 3

[0062] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric, the dyeing and finishing method comprising the following steps:

[0063] The cotton-wool blended fabric blank is first dyed at 65°C and a bath ratio of 1:15 for 30 minutes; then softened with a Sinsofter CMK-815A softener with a mass concentration of 2.5%; then napped at a forward speed of 15m / min and a cloth output speed of 5m / min; during napping, the tension of the cotton-wool blended fabric blank is 3N, the straight needle ratio is 1.8%, the curved needle ratio is 0.5%, and the drum speed of the napping machine is 155m / min; then, the napped cotton-wool blended fabric blank is subjected to polarization, and the polarization includes firstly using a steam temperature of 80°C for steam heating for 8 minutes, then using a hot air of 70°C for hot air drying for 6 times, and the single drying time is 10 minutes, and using a cold air of 30°C for cold air cooling for 15 minutes; and adding a regulating acid (Sirrix NE liq); and finally, the finished fabric was shaped at 140° C., a speed of 20 m / min and an overfeed ratio of 15%.

[0064] The dyeing solution used in the dyeing described in this embodiment is 0.5wt% of Jagersul Fast Yellow HF-NP, 0.5wt% of Jagersul Fast Red BF-RL, 0.3wt% of Jagersul Fast Blue HF-BR, 20g / L anhydrous sodium sulfate and 15g / L sodium carbonate.

[0065] Example 4

[0066] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the dyeing temperature is 55°C.

[0067] Example 5

[0068] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the dyeing temperature is 70°C.

[0069] Example 6

[0070] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that a napping process is directly performed after dyeing, that is, no softening treatment is performed.

[0071] Example 7

[0072] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the tension of the cotton-wool blended fabric blank during napping is 0.8N.

[0073] Example 8

[0074] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the tension of the cotton-wool blended fabric blank during napping is 3.5N.

[0075] Example 9

[0076] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the steam heating time during the pelletizing is 10 minutes.

[0077] Example 10

[0078] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the steam heating time during the pelletizing is 3 minutes.

[0079] Embodiment 11

[0080] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the overfeed ratio during the setting is 8%.

[0081] Example 12

[0082] This embodiment provides a dyeing and finishing method for a cotton-wool blended fabric. The dyeing and finishing method is the same as that of Embodiment 1 except that the overfeed ratio during the setting is 16%.

[0083] 2. Comparison

[0084] Comparative Example 1

[0085] This comparative example provides a dyeing and finishing method for a cotton-wool blended fabric, which is the same as Example 1 except that the granulation process is not performed.

[0086] 3. Test and its results

[0087] According to the ISO 6330 shrinkage performance test method, the shrinkage of the finished fabrics obtained in the above embodiments and comparative examples was tested (washed twice and hung to dry), and the shrinkage (including transverse shrinkage and longitudinal shrinkage) was calculated. The results are shown in Table 1.

[0088] Table 1

[0089]

[0090]

[0091] Note: “-” in Table 1 indicates shrinkage.

[0092] From the data in Table 1, we can see that:

[0093] (1) It can be seen from Examples 1 to 3 that the present invention sequentially dyes, naps, shakes and shapes the cotton-wool blended fabric blank, and the synergistic effect of each process makes the lateral shrinkage of the finished fabric as low as below -1.0% ("-" represents shrinkage) and the vertical shrinkage as low as below -3.2% ("-" represents shrinkage), thereby solving the problem that the cotton-wool blended fabric is easily shrunk when it comes into contact with water.

[0094] (2) Combining Example 1 with Example 4 and Example 5, it can be seen that the dyeing temperature in Example 4 is too low, resulting in uneven dyeing and the color of the finished product does not meet the production requirements; the dyeing temperature in Example 5 is too high, resulting in the lateral shrinkage of the finished fabric increasing to -4% and the longitudinal shrinkage increasing to -6.0%. This shows that the present invention further prefers that the dyeing temperature is 60-65°C, which further improves the dyeing quality of the finished fabric and improves its shrinkage phenomenon.

[0095] (3) Combining Example 1 and Example 6, it can be seen that Example 6 did not perform a softening treatment but directly napped the fabric after dyeing, resulting in the lateral shrinkage of the finished fabric increasing to -6.0% and the longitudinal shrinkage increasing to -5.3%. This shows that the present invention further preferably adds a softening treatment between the dyeing and napping steps to further reduce the shrinkage of the cotton-wool blended fabric.

[0096] (4) Combining Example 1 with Examples 7 to 10, the tension of the cotton-wool blended fabric blank during napping in Example 7 is relatively low, resulting in the lateral shrinkage of the finished fabric increasing to -5.0% and the longitudinal shrinkage increasing to -8.0%; the tension of the cotton-wool blended fabric blank during napping in Example 8 is relatively high, resulting in the lateral shrinkage of the finished fabric increasing to -3.5% and the longitudinal shrinkage increasing to -7.2%; the steam heating time during the pelletizing in Example 9 is relatively long, resulting in the lateral shrinkage of the finished fabric increasing to -2.7% and the longitudinal shrinkage increasing to -6.8%; the steam heating time during the pelletizing in Example 10 is relatively short, resulting in the lateral shrinkage of the finished fabric increasing to -3.3% and the longitudinal shrinkage increasing to -6.3%; This shows that the present invention further preferably has the tension of the cotton-wool blended fabric blank during napping as 1 to 3N, and further preferably has the steam heating time during the pelletizing as 5 to 8min, which further improves the shrinkage of the cotton-wool blended fabric.

[0097] (5) Combining Example 1 with Example 11 and Example 12, it can be seen that the overfeed ratio during the shaping in Example 11 is too low, resulting in the lateral shrinkage of the finished fabric increasing to -4.2% and the longitudinal shrinkage increasing to -5.6%; the overfeed ratio during the shaping in Example 12 is too high, resulting in the lateral shrinkage of the finished fabric increasing to -2.8% and the longitudinal shrinkage increasing to -6.6%. This shows that the present invention further preferably overfeeds the shaping in a ratio of 10% to 15%, thereby further reducing the shrinkage.

[0098] (6) From Example 1 and Comparative Example 1, it can be seen that since the pelletizing process is not performed in Comparative Example 1, the pre-shrinkage before shaping cannot be performed, and the cotton-wool blended fabric cannot form a stable fiber structure, and the internal stress of the fabric after napping cannot be released, resulting in the difficulty in improving the shrinkage phenomenon, and the lateral shrinkage rate increases to -7.0%, and the vertical shrinkage rate increases to -9.8%. This shows that the present invention adds a pelletizing process, performs pre-shrinkage treatment before shaping, optimizes the fiber structure, reduces internal stress, and achieves dimensional stability of the cotton-wool blended fabric, thereby reducing its shrinkage rate.

[0099] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A dyeing and finishing method for a cotton-wool blended fabric, characterized in that: The dyeing and finishing method comprises the steps of dyeing, napping, shaking and shaping the cotton-wool blended fabric blank in sequence to obtain the finished fabric.

2. The dyeing and finishing method according to claim 1, characterized in that: During the dyeing process, the bath ratio of the cotton-wool blended fabric blank to the dyeing solution is 1:(10-15); Preferably, the dyeing solution comprises yellow reactive dye, red reactive dye, blue reactive dye, anhydrous sodium sulfate and sodium carbonate; Preferably, the dyeing solution comprises 0.1 wt% to 0.5 wt% of yellow reactive dye, 0.1 wt% to 0.5 wt% of red reactive dye, 0.1 wt% to 2 wt% of blue reactive dye, 5 to 20 g / L of anhydrous sodium sulfate and 5 to 15 g / L of sodium carbonate.

3. The dyeing and finishing method according to claim 1 or 2, characterized in that: The dyeing temperature is 60-65°C; Preferably, the dyeing time is 30 to 60 minutes.

4. The dyeing and finishing method according to any one of claims 1 to 3, characterized in that: After dyeing, the dyed cotton-wool blended fabric blank is softened and then napped; Preferably, the softener used in the softening treatment includes CMK-815A softener; Preferably, the mass concentration of the softener used in the softening treatment is 1.0% to 3.0%.

5. The dyeing and finishing method according to any one of claims 1 to 4, characterized in that: The cloth feeding speed during napping is 10-15 m / min; Preferably, the cloth output speed during napping is 2-5 m / min.

6. The dyeing and finishing method according to any one of claims 1 to 5, characterized in that: The tension of the cotton-wool blended fabric blank during napping is 1-3N; Preferably, during the napping, the proportion of straight needles is 1% to 1.8%, and the proportion of curved needles is 0% to 1.2%; Preferably, the roller speed of the napping machine during napping is 150-155 m / min.

7. The dyeing and finishing method according to any one of claims 1 to 6, characterized in that: The polarization comprises sequentially subjecting the napped cotton-wool blended fabric blank to steam heating, hot air drying and cold air cooling; Preferably, the steam temperature of the steam heating is 80-100°C; Preferably, the steam heating time is 5 to 8 minutes; Preferably, the hot air temperature of the hot air drying is 70-80°C; Preferably, the number of hot air drying is 4 to 6 times, and the single drying time is 5 to 10 minutes; Preferably, the cold air temperature of the cold air cooling is 30-40°C; Preferably, the cooling time of the cold wind is 8 to 15 minutes.

8. The dyeing and finishing method according to any one of claims 1 to 7, characterized in that: The shaping is carried out in an open width shaping machine; Preferably, the shaping temperature is 120-140°C; Preferably, the shaping speed is 15-20 m / min; Preferably, the overfeeding ratio during shaping is 10% to 15%.

9. The dyeing and finishing method according to any one of claims 1 to 8, characterized in that: The step of adding a regulating acid to the cotton-wool blended fabric blank after the spinning process before the shaping process; Preferably, the added mass concentration of the regulating acid is 0.01% to 5%.

10. The dyeing and finishing method according to any one of claims 1 to 9, characterized in that: The dyeing and finishing method comprises the following steps: The cotton-wool blended fabric blank is first dyed at 60-65°C and a bath ratio of 1:(10-15) for 30-60 minutes; then softened with a softener having a mass concentration of 1.0%-3.0%; then napped at a forward speed of 10-15m / min and a cloth output speed of 2-5m / min; during napping, the tension of the cotton-wool blended fabric blank is 1-3N, the straight needle ratio is 1-1.8%, the curved needle ratio is 0-1.2%, and the drum speed of the napping machine is 150-155m / min; then the napped cotton-wool blended fabric blank is napped The cotton-wool blended fabric blank is subjected to shaking, and the shaking includes firstly using a steam temperature of 80-100° C. to perform steam heating for 5-8 minutes, then using a hot air of 70-80° C. to perform hot air drying for 4-6 times, and a single drying time is 5-10 minutes, and using a cold air of 30-40° C. to perform cold air cooling for 8-15 minutes; and adding a regulating acid with a mass concentration of 0.01-5% to the cotton-wool blended fabric blank after the shaking; and finally shaping the finished fabric under the conditions of 120-140° C., a vehicle speed of 15-20 m / min and an overfeed ratio of 10%-15%.

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