Dispersion/activity pluronic printing process

Polyester-cotton blend fabric printing, a simpler method using paint printing. However, for deep-colored, large-area patterns, generally the feel after the print is hard, and the rubbing and washing fastness is poor. The use of dispersion/activity slush printing process can not only make the product full of color and appearance, but also have good fastness, and the printing process is relatively simple.

1 Process determination

Since the K-type reactive dye is used for printing, the colorant contains an alkali agent (baking soda), and when most disperse dyes are dyed with polyester, steaming under alkaline conditions will cause severe discoloration. Therefore, the first hot-melt treatment should be used first to disperse the dispersant into polyester, and then steaming according to the requirements of the reactive dye printing cotton. In this case, most of the reactive dyes are fixed to the cotton fibers before steaming to prevent the printed fabrics from being left in place for a long period of time before being steamed to be affected by the carbon dioxide and moisture in the air, and the pattern will be printed. If a light-colored pattern is printed, steaming may not be performed after hot-melting. The process flow is as follows:

Turn seams→Singe→Boiling and bleaching→Silk→Forming→Printing→Hot melt→Steaming→Saponification→Post-processing

2 pre-processing

2.1 Singeing

Two positive and two negative, speed 100 ~ 110m/min, singe 4.

Insufficient singeing, the process of producing the polyester-cotton blended fabric will produce skein, which will block the stencil during printing; the singeing will be uneven, and the singeing will be uneven, and the finished product will be burned too hard. Therefore, the temperature of the crater is required to be uniform, and the fire extinguishing and cooling device on the cloth surface after singeing are effective.

2.2 Decoction

The desizing rate is over 95% and the effect of the hair is 8cm/30min or more.

The effect of decoction bleaching not only affects the dyeing performance of semi-finished products, but also affects the feel and fluff of the fabric. Dispersion/activity Pulp printing is mostly used for large-area, deep-dense-colored patterns. Decoction and bleaching can not meet the requirements, which will seriously affect the printing effect.

2.3 Mercerization

Silk can not only improve the brightness of printed products, but also important for the saving of dyes.

It is required that the pH value of the fabric surface be about 7 and be even.

2.4 Shaping


Shaping can improve the dimensional stability of polyester-cotton blended fabrics, and can eliminate the slight creases generated during the process, which is a great help for printing. The general setting condition is 210°C×20s.

3 printing

Because the cotton fiber is printed with reactive dyes, the alkaline paste affects the disperse dye fixation; high-temperature fixing of the disperse dyes with the hot melt method affects the cotton fibers. Therefore, when polyester-cotton blended fabrics are used for disperse/active ploymer printing, proper selection of reactive dyes and disperse dyes should be used to properly formulate various process parameters.

3.1 Selection of reactive dyes

The sublimation fastness of reactive dyes is good, but some dyes have a serious stain on polyester, especially in the hot-melt dyeing, the phenomenon of increasing the amount of urea is more obvious. Some reactive dyes have become dull in the polyester-cotton blend fabric. Therefore, attention should be paid when selecting dyeing, dyeing and washability. Most of the K type (monochlorotriazine) reactive dyes have small polyester staining properties and good color stability, and are suitable for homogenous printing.

3.2 Selection of Disperse Dyes

For reactive dye homogenous printing, the alkali agent in the colorant causes the disperse dye to change color and even destroy the dye. Therefore, the alkali resistance should be considered when choosing. In addition, cotton fibers begin to yellow during dry heat setting at 170°C. After the fabrics are alkali-melted (ie, around pH 10), the cotton fibers form a fugitive spot that is difficult to remove. If the hot melt temperature is above 190°C, the situation is more serious. Some disperse dyes can seriously contaminate cotton, making it difficult to wash away, resulting in dark colors, poor fastness, and staining of white areas when washed. Therefore, high-temperature hot-melting temperatures and high-temperature hot-dyeing temperatures should be selected.

In summary, when selecting disperse dyes, dyes with good alkali-resistant stability, small influence of hot-melt temperature on cotton, and moderate sublimation fastness should be used.

3.3 Alkali dosage

Dispersion/Activity In the sizing printing, the baking soda is used as the active dye fixing alkali agent, and the disperse dye is dyed into the polyester fiber firstly, and then steamed so that the reactive dye is fixed on the cotton fiber. This method is simple, but due to the presence of alkaline agents, pH value increases, the disperse dye shade will be dark, while the fabric yellowing, the more the amount of baking soda, the more serious fabric yellowing. Therefore, the amount of baking soda is 1% to 1.5%.

3.4 Urea consumption

Urea is not only conducive to increase the fixation rate of reactive dyes, but also it can effectively reduce the occurrence of browning of cotton fibers under alkali and high temperature conditions. After printed fabrics are printed on the fabrics for drying, urea mainly adheres to the cotton fibers and melts or gasifies or decomposes during the hot-melt process. These endothermic reactions protect the cotton fibers. However, since urea will expand these two fibers, it will increase the staining of these two fibers by the dye, and reduce the utilization of the dye and the brightness of the color.

To sum up, the urea consumption is generally 5%, if you use a single hot-solution fixation (that is, no longer steaming after hot melt), can increase 8% to 10%.
3.5 Process prescription disperse dyes x
Reactive dye y
Urea 5 to 10
Baking soda 1～1.5
Anti-stain salt S 1
Sodium alginate paste 40～60
Water amount


Source: China Washing & Dyeing Industry Information Center