Coating steam-free discharge printing process (5)

Pull out the white pulp--add the dispersant K into the steam-free printing paste. The orange-red particles in the pulp disappeared. Continue to add the penetrant and the white paint to mix and use it for printing.

Color Pulp--In the same order as the preparation of white pulp, the final addition of the required quantitative color coating is used for printing.

(4) Printing process

Pull white → stained fabric (enzymatic desizing treatment) printing → drying → alkaline color reagent (overprinting) or padding → hot water washing → soaping → washing → dehydration drying.

Color pulling - the same as pulling white printing, just after the drying into the 140-145 °C heat fixation conditions, followed by alkaline color reagent (overprinting or padding) treatment, followed by whitening water washing conditions.

Because the indigo-blue denim cloth-free steaming paint discharging and printing process is a brand-new process, generally, no special discharge printing equipment is required, but a room-temperature fast alkaline coloring agent is used to carry out the alkali extraction process, and the indigo can be decomposed into The yellow substance is washed off with proper washing conditions to achieve the purpose of pulling white and pulling the printing. The foregoing is a continuous production process, and the general printing and discharging of the clothing are carried out by simply printing the alkali on the tablet after the manual platen printing and drying. After the chromogenic agent is placed, it can be sent to the washing, drying, and finished products at a room temperature of about 30 mm.

* Alkaline chromogenic agent - is a printing paste containing about 10% strong alkali or a liquid with a certain viscosity (suitable for padding process conditions), used as a denim cloth-free paint for discharge printing.

2.10 Paint Dyeing and Printing Ground Color Dyes

Fabrics can be re-printed after extractable dyes. Since the printing paste contains reducing agents or oxidants (chemicals, called dye discharging agents) that can destroy the color dyes, they will decompose after the steaming or baking treatment. After washing, the fabric printing part shows a white flower shape, called pull white printing. Such as printing paste with anti-dyeing agent coating color paste, can be bright and bright in the printing area of ​​the fabric, fine flower shape, clear outline, color and ground color between the third color, contrast and very beautiful printed fabric .

(1) Color reactive dyes for discharging

The removability of reactive dyes has a great relationship with the variety and molecular structure of the dyes. Its precursor is a reactive dye with a monoazo structure. When its reactive group is attached to the diazo moiety, its whitening performance is better than that of the reactive group that is attached to the coupling moiety. Commercial vinyl sulfone reactive dyes have better pull-out properties than chlorotriazine-reactive dyes. At the same time, the removability of the reactive dyes is also related to the bonding stability of the dyes and the fibers in the fabrics. Therefore, if the dyes of the same type are not bonded and fixed after dyeing, that is, when they are used as a pull-out printing, the degree of whiteness thereof is increased. High, bright color pull finished product is also good. This process is known as half-dyeing or half-drawing printing.

The author believes that the half-drawing printing process is suitable for paint discharge printing and is expected to have a more colorful flower shape than the general method. At present, KN-type vinylsulfone reactive dyes are more practically used. Now, the famous product of the German company Dystar Dystar is introduced as follows:

Pull white:

Color pull:

Yellow

4GL

Yellow

4GL

yellow

GR

yellow

GR

golden

RNL

golden

RNL

yellow

RR

yellow

RR

Brilliant orange

3R special

Brilliant orange

3R special

Brilliant orange

FR

Brilliant orange

FR

Brilliant red

F3B

Brilliant red

F3B

Violet

5R

/

Brilliant blue

BB

Brilliant blue

BB

Lake Blue

G

/

blue

RR

blue

RR

Navy

GG

Navy

GG

Yuan Qing

B

Yuan Qing

B

Shen Yuanqing

N

Shen Yuanqing

N

The dark color and light color discharge performance of the above varieties are better and can be selected. Generally, the domestic KN type can also be used, but it is necessary to find out which specific type can be extracted well. This is the basic requirement for coating discharge printing, please Attention (Levafix) All of Livafix reactive dyes cannot be removed and cannot be used.

The dyes related to dyeing and printing, as well as dispersion, acidity, etc. Readers can refer to the printing and dyeing (2002No9) and printing and dyeing (2002No10) two-stage serialization. Chu Chu's knowledge is used to guide production.

(2) Domestic and foreign commonly used resistant coating products

Another important problem faced in the production of coatings for printing and dyeing is that the specific types of commercial products in the domestic and foreign markets must be resistant to pull paint. This problem must be very clear, otherwise it will not be successful!

Domestic paints are represented by the Swan brand produced by the Shanghai Ink Factory. The specific types are as follows:

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