Dyeing process of color knitted denim coating

Abstract

The present invention relates to a dyeing process of a color knitted denim coating. The process includes coloring and fixation. The coloring is as below: beating a coloring agent into coloring foam by a foam generator, applying the coloring foam onto a staining surface of a full width traveling fabric, controlling the amount of foam and fabric speed to reach liquid amount of the fabric at 8-15%, and progressively drying by seven groups of cloth drying cylinders at different temperatures at a drying temperature with constant temperature increment of 70 DEG C-120 DEG C. The fixation is as below: beating a coloring agent into coloring foam by a foam generator, applying the coloring foam onto a staining surface of a full width traveling fabric in the step B, controlling the amount of foam and fabric speed to reach liquid amount of the fabric at 8-15%, and progressively drying by seven groups of cloth drying cylinders at different temperatures at a drying temperature with constant temperature increment of 70 DEG C-120 DEG C. The coloring and fixation both use a foam coating manner, and the liquid amount of the fabric is controlled at a low range of 8%-15%, so as to realize the dyeing process of knitted denim. The process has the advantages of uniform coloring, firm staining, and reduction of heat and water consumption.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing, and in particular relates to a foam coating dyeing process for knitted denim. Background technique [0002] In the knitted fabric industry, one-side dyeing or fabrics with different colors (two-color) on the front and back can only be done in three ways: [0003] 1. One side is cotton fiber, the other side is polyester fiber, using disperse dyes and reactive dyes to color respectively, this method can also use colored polyester fibers to avoid the process of double dyeing, but you must choose low-pollution reactive dyes, otherwise polyester The color is polluted. If the double dyeing method is used, the non-staining requirements of disperse dyes and reactive dyes are higher. Moreover, the production process is long, the output is low, and the energy consumption of water, electricity, steam, etc. is also huge. [0004] 2. The dyed weaving method refers to the use of cheese dyeing met...

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Problems solved by technology

Moreover, the production process is long, the output is low, and the energy consumption of water, electricity, steam, etc. is also huge.

[0004] 2. The dyed weaving method refers to the use of cheese dyeing method to dye two kinds of colored yarns to weave directly, but the effect of cheese dyeing is particularly high. If the color of the inner layer, middle layer and outer layer of the cheese yarn is slightly inconsistent, it will Causes streaks on the fabric surface, affecting the appearance

As for package dyeing, there are also defects such as long production process, low output, and large energy consumption such as water, electricity, and steam.

[0005] 3. Some factories use printing machines or coating machines to paint the pigment on one side, but a large amount of adhesives are used in the formula, which makes the cloth surface water-resistant, making most of the denim-like washing process impossible. At the same time, Due to various reasons such as formaldehyde in the adhesive, poor fastness, and hard hand feeling, the marketing effect is poor

As for the use of reactive dyes, the dyes on the fabric surface must undergo debuffing and other processes to fix the color and soaping. It is very easy to stain or penetrate the surface color to the other side, forming pollution.

[0006] In addition, an important process in dyeing is color fixation. The existing technology mainly achieves color fixation through high-temperature steaming and baking. The temperature required for steaming and baking is high, and the energy consumption of enterprises is large. It also has a slight effect on the color rendering effect of the final color, resulting in a difference in saturation between the actual dyeing effect and the target color, especially in mass production. In the past, it often relied on the dyeing workers' experience to overcome this defect

[0007] At present, the textile dyeing and finishing industry is still produced in the traditional padding method, and there is still room for improvement in terms of operating procedures, energy consumption and environmental friendliness