What Influences The High Temperature And High Pressure Of Dyed Color Of Polyester Fabric?

Here is a Plain Weaving Polyester Fabrics Factory talking about the factors influences the high temperature and high pressure of dyed color of polyester fabric.

Plain Weaving Polyester Fabrics is widely used in various textiles and apparel fabrics due to its high strength, good elasticity, excellent wear resistance, good dimensional stability and good wrinkle resistance. Disperse dyes have small molecular weight and are slightly soluble in water. They are ideal dyes for polyester fabrics. They are usually dyed with disperse dyes. There are three methods: hot melt dyeing, high temperature and high pressure dyeing, and carrier dyeing. We are currently using high temperature and high pressure dyeing methods. In order to prevent coloring and color spots in the dyeing process, we must pay attention to the following aspects:

Plain Weaving Polyester Fabrics

Disperse dyes are difficult to dye polyester fibers at low or normal temperatures, and dyes are quickly dyed only when the glass transition temperature of polyester is exceeded.

1. If the initial dyeing rates of several color matching dyes are too different, it is easy to form a local competitive dyeing at this time to cause coloring. Therefore, when selecting a dye, the initial dye uptake of several color-matching dyes should be similar.

2. If the dye has a high initial dyeing rate, it is easy to cause coloring. In general, when dyeing polyester with dispersing materials, dyes with initial dyeing rates close to each other, initial dyeing rate, good quality, and similar color matching properties should be selected. For example, the E type with light color, the SE type with medium color, and the XF or SF type with dark color can basically satisfy the deep and medium light dyeing of polyester, and the effect is good.

Auxiliary choice

Due to the dyeing properties of polyester fiber, it has basic requirements for high-temperature leveling agent; on the other hand, due to the difference in the specifications of polyester fiber semi-finished products, it also has corresponding individual requirements for high-temperature leveling agent. Therefore, in addition to the basic properties suitable for retarding and dyeing at 130 ° C, high-temperature leveling agents for polyester dyeing should also have special properties that meet the dyeing characteristics of various polyester fiber semi-finished products.

Heating rate control

The heating rate is also an important factor in the production of color flower. After reaching the glass transition temperature of polyester, the temperature rises too fast, and the dye will quickly dye the fiber to form a partial dyeing to cause color flower and color block. If the dye is initially dyed. High, the color flower is more serious. Therefore, in the process of dyeing and heating, it can be divided into three stages and controlled by different heating rates. The first stage is to raise the temperature to 75 ° C at normal temperature. At this stage, the disperse dye will hardly dye the fiber, and the faster heating rate can be 2-3 ° C. The second stage is 75-110 ° C. This temperature zone is dye on the dye. In the fastest stage of dyeing, it is necessary to adopt slow heating, control is preferably 0.8-1 °C, and the third stage is 110-130 °C. At this stage, dye dyeing will be completed, and the heating rate of 1.5-2 °C can be used.

Other factors

For example, the chemical material, the capacity, the bath ratio, the PH value, whether the grey cloth is clean, the overflow speed is appropriate, and the running speed of the fabric also have a certain influence on the color flower. The disperse dye is generally heated at 40 ° C, and evenly stirred. After filtering, it can be injected into the dyeing tank; the dosage should not exceed the maximum capacity of the dyeing tank; the bath ratio is 1:8-12; the pH should be controlled at 4-4.5; the cloth surface should be clean, PH The value is neutral; in addition, the speed of the overflow is also reasonably adjusted for the speed of the fabric in the cylinder.

Finally, if a slight color flower is found after the dyeing is finished, a certain amount of repairing agent may be added to perform color correction by means of transfer dyeing.

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