Common printing process

First, direct printing

Direct printing refers to a process in which a colorant containing a dye or a pigment is directly printed on a white semi-finished product or a dyed fabric, and the dyestuff or the pigment at the printing is dyed to obtain a desired pattern. The effect of direct printing is clear on the printing machine, and the printing quality is also relatively easy to control. It is a very mature and widely used printing process. Textiles with different compositions can be directly printed with different types of dyes. However, for cellulose fiber fabrics, direct printing of reactive dyes and direct printing of paints are commonly used. Reactive dyes and coatings can also be used for printing on the same printing fabric, and can be used to obtain better printing results.

The paint direct printing process can be used for textiles of any fiber material, and the process flow is short, has a very good energy-saving effect, and has occupied a considerable proportion in fabric printing. The inadequacy is that the frictional fastness is not very satisfactory, and the feel of large-faced coating printing cloth is also worse than that of reactive dye printing, so the high-grade printing product will still use more reactive dye printing technology. There is now a kind of printing called imitation-active printing, which has a distinct improvement over the feel of traditional paint-printing fabrics. Direct printing has the following methods. Whether or not to do pre-press stretching in the production depends on the nature of the pattern and the quality level of the semi-product.

1. Reactive dye direct printing process washing

Pre-press semi-products → (stretching full-weft) → printing → steaming → washing

2. All-paint direct printing process

Pre-press semi-finished products → (stretch full width) → printing → baking → (washed)

3. Process printing of reactive dyes and Coats co-printing

Pre-press semi-products → (stretch full-weft) → printing → steaming → baking → washing

Second, anti-printing and anti-ink printing

Anti-printing printing refers to the printing process that first applies anti-dye colorant or anti-dying agent on the fabric, and then covers the other colorant that is not resistant to anti-inking agent to achieve anti-printing effect; Printing refers to the process of imprinting the dye paste on the fabric to prevent the dyeing of the pattern from being applied to the fabric. It may also be dyed with a dye on the fabric first, and then printed with an anti-colorant paste to destroy the color before the hair color is applied. Color to achieve the purpose of printing the printing process. In fact, the process principles of the two processes are exactly the same. In the printing and dyeing factories, the anti-dyeing and printing process has a long process flow. In particular, the fabric printed with the anti-stained paste will gradually fall into the dyeing solution during dyeing, which will affect the color of the earth and the quality will be difficult to control. Not much.

The anti-imprinting printing process is simple and quick, the process is flexible, and the quality is easy to control. It is often used to prevent the third color from occurring when the two colors (contrast colors) of the small block point, the line part, and the flower pattern collide. Satisfactory printing effect, the use of printing and dyeing plants is also very extensive. Commonly used anti-imprinting processes are coating anti-reactive dyes and active anti-reactive dyes (using the difference in dye performance) in two ways.

Anti-print printing process is:

Prepress semi-finished products → (stretching full-weft) → printing → steaming → (baking) → washing

In the process of anti-reactive printing with paint, it is necessary to increase the baking process to ensure the fastness of paint printing.

Third, discharge printing

Discharging and printing refers to the process of printing a white pulp or a color paste on a dyed fabric, destroying the ground dye with a discharge agent, and forming a pattern on the fabric. Its characteristics are plump, clear outline, precise and precise, and the printing effect is inferior to direct printing and anti-imprint printing. It is a high-grade fabric printing process.

1. Paint pulling reactive dye printing process (neutral pull)

Prepress color cloth → (stretch full width) → printing → baking → washing

2. Reduction of reactive dye printing process (basic pull)

Pre-press color cloth → (stretching full-weft) → printing → steaming → washing

3. Active pull dye reactive dye printing process (Sodium sulfite and its replica pull)

Dyeing ground color (without hair color) → (Tensional full length) → Printing → Steaming → Washing

However, the disadvantages of the discharge printing process are that the process is cumbersome and lengthy, the printing ink is not easy to find and detect in time, the quality is difficult to control, the grade A product rate is low, and the printing cost is relatively high, so the printing and dyeing plants generally use this process less frequently. This process is only used to compare the printing of special patterns.