Brief description of textile printing process and printing method
First, the textile printing process:
1, active printing
Reactive printing, as its name implies, means that our printing dyes are made from reactive printing and dyeing. Reactive printing fabrics bright colors, color fastness, soft, you can often wash does not fade, long with new.
Reactive dyeing is also known as reactive dye. It contains an active gene that reacts with fiber molecules. During dyeing and printing, the active genes of the dye combine with the fiber molecules to form a unitary dye and fiber. Reactive printing: printing of reactive dyes that penetrate the fabric! The general activity of printing and dyeing to ensure that environmentally friendly harmless, feel better, there will be no hard a soft feeling. Of course, the cost is much higher than the paint printing and dyeing.
Reactive printing dyeing process
(Including semi-bleached or bleached, but the dye tank can not be fixed and soft) → dry cloth (color cloth 150 ℃, bleached cloth 130 ℃) → Handles to do PS (water setting, color cloth 160 ℃, bleach Cloth 150 ℃) → printing (active pulp, rotary screen or tablet printing, 130 ℃ dry cloth) → steaming cloth (102X10min) → dyeing department washing (washing Ling water, boiling hot water, depending on the printing color depth and fastness Do fixing) → dry cloth (color cloth 150 ℃, bleached cloth 130 ℃) → finished shape (soft oil or resin) → product inspection cloth.
2, printing paste
Painting printing is a kind of cleaner production process, which makes the paint cover the fabric. Compared with the dye printing, the paste printing has the advantages of simple process, short process flow, convenient color matching, small pollution and low cost Advantages, under the pressure of energy constraints and environmental requirements, paint printing favored. Disadvantages of the paste printing are: paint is a small solid particle insoluble in water, no affinity for the fiber, the adhesive needs to be fixed to the fiber coating the surface. There is a feeling of stiff paste printing, bright color, poor friction and washing fastness, and the fabric has a lot of formaldehyde and poor ventilation and other issues.
Paint printing dyeing process
(Including semi-bleached or bleached, but the dye tank can not be fixed and soft) → dry cloth (color cloth 150 ℃, bleached cloth 130 ℃) → Handles to do PS (water setting, color cloth 160 ℃, bleach Cloth 150 ℃) → printing (paint pulp base, rotary screen or tablet printing, 150 ℃ dry cloth) → Handle the finishing department (depending on the printing area or fastness) → final setting (soft oil or resin) → product inspection cloth .
3, drawing and printing
Discharge printing also known as engraving, printing. Refers to the printed fabric can be printed on the elimination of "background" color paste and produce white or color pattern printing process. Printing, the first printed on the ground fabric containing a destructive background color paste, dried with a discharge agent or containing a dye-resistant dye printing dye. Post-processing, the printing at the background color dye is destroyed and achromatic, forming a white pattern on the color base or dye-colored dye-forming color pattern, also known as pull color or color pull. It is through the use of reducing agents and oxidants colored fabric to destroy the ground color to obtain a local color or achromatic pattern. Due to the different fabrics, the choice of chemical discharge agent is also different. Discharge dyeing printing can be used for cloth, but also can be used for finished garments. (Such as jeans)
Printing and dyeing printing process
Dyeing (dye tank can not be fixed and soft) → dry cloth (150 ℃) → Finishing department to do PS (water setting, 160 ℃) → printing Cloth) → Handing Division (Hand drawn 170 ℃ X24m / min dry, pull white 160 ℃ X24m / min dry set) → Dye Department washing (flat washing machine wash water, cylinder solid color) → dry cloth 150 ℃) → finished stereotypes (soft oil or resin) → product inspection cloth.
4, transfer printing
Printed fabric with printed paper method. In the printing press pattern design transfer ink, printed on paper, made of textured paper --- transfer printing paper. In the fabric printing, the front of the transfer printing pattern with the front fabric fabric affixed in the transfer printing machine under certain conditions (temperature) so that the dye transfer to the fabric.
Features: Flowers really, the process is simple. Polyester transfer printing without steaming, washing. Small energy-saving pollution. Waste paper, ink utilization is not high
Second, the textile printing method:
(A) by equipment to points
The main printing device for the screen, which stems from the version of printing. Pattern printing is the printing of paper, metal or chemical engraving into a hollow pattern. Screen is divided into two kinds of flat screen and round screen, flat screen is stretched over the metal or wooden rectangular frame, circular screen is the use of nickel round metal mesh. Printing, the pattern engraved on the Internet in the flat screen or rotary screen printing machine paste by screen printing patterns will be transferred to the textile, flat screen printing with hand and mechanical, and rotary screen printing is a continuous mechanical operation , Round screen and flat screen printing is currently widely used printing method, this method of printing more sets of color, unit arrangement of flowers is more lively, the textile tension suffered by small, not easy to deformation, flower color is good, plump color, and screen printing Less cloth, especially suitable for small quantities, more varieties of production.
2 roller printing
The main printing device is patterned copper roller, also known as the flower, it and other components of the printing machine. The paste is transferred to the textile by embossing with a copper roll engraved with a printing pattern. This printing method occupies a certain proportion of the domestic cotton printing production. According to the device model can be loaded with a few colors called a few days of flower printing machine. The production cost of roller printing is low and the production efficiency is high. The printing roller speed of modern roller printing machine can reach 100m / min, and the output is high, which is suitable for mass production. The printed pattern has a clear outline and can print fine line patterns. However, the tension suffered by textiles, printing color and pattern size is limited, the first printed by the printing of the cylinder after the crush easily lead to color and color is not enough fullness, affecting the color vividness.
3. Transfer printing
According to the pattern, the first dye or paint printed on the paper to get the transfer paper, and then under certain conditions so that the transfer of the dye on the textile paper transfer to the printing method. The method of transferring the dye from the transfer paper to the textile by heat is called the heat transfer method. The method of transferring the dye from the transfer paper to the textile under the action of a certain temperature, pressure and solvent is called the wet transfer method. Transfer printing is a novel printing method that emerged in the 1950s. It is especially suitable for printing small batch sizes. It requires no post-processing after printing and reduces contamination, and is a cleaning process. Printed patterns rich and colorful, realistic style, artistic, printing defects less, but the transfer of paper consumption, high cost. At present, mainly for polyester, nylon textile printing, transfer printing on natural fiber textile remains subject to innovation and development.
4 other printing method
In addition to the above-mentioned common printing methods, there are also some new printing methods used for producing special printing products and now are developing rapidly, mainly including electrostatic flock printing, multi-color shower printing, ink jet printing and the like.
(B) according to the process points
1. Direct printing
The dye-containing paste directly printed on white cloth or light-colored cloth, printing paste Department of dye dye, get a variety of patterns, unprinted place to maintain the same color, the color of the dye on the light to light color Has a certain shade, spell color, this printing method is called direct printing.
According to the pattern of patterns, direct printing can be obtained three types of printing products, (1) white cloth, its less color, more white; (2) Montreal, less white; (3) Is printed on the dyed cloth, this kind of cloth on the close friends of white flowers, to color than shallow, color and color are of the same color, is a widely used printing method.
2. Discharge printing
The first printing after dyeing, in the printing paste contains a destructive color dye chemicals, known as discharge agent, under appropriate conditions, the color can be destroyed by washing white flowers called white; if the printing paste In the dye can be resistant to discharge agent, then destroying the color at the same time with another color, called color (also known as pigmentation). Pull white printing and dyeing discharge printing can be applied to a pattern at the same time, collectively known as discharge printing.
Discharged printed fabric to color fullness bright color, delicate patterns, clear outline, color and color to the third color, the effect is better. However, when printing is more difficult to find flaws, the process industry is more complicated, higher printing costs, but also suitable for discharge to the ground color is small, so the application has some limitations.
3. Anti-dye printing
In the printing paste contains a chemical dye to prevent the dye on the dye, known as anti-staining agent, and then dyeing, printing of the earth color dye does not dye, no color, no color, washed by water to get white flowers Called anti-white; if the printing paste to add a dye-resistant dye, the anti-staining at the same time with another color, called anti-color (also known as anti-staining), anti-white printing And coloring anti-dye printing can also be applied to a pattern, collectively known as anti-dye printing.
If you choose a anti-stain agent, it can partially in the printing Department of the anti-dyed color or ground to play a role in mitigation, and finally make the printing at neither anti-white, nor is it all on the ground color, and appear lighter than the color Of the pattern, and pattern at the color fastness to color standards, which is halftone anti-dye printing, referred to as semi-anti-dye printing.
Compared with the discharge printing, anti-dyeing printing process is short, suitable for more color dye, but the pattern is generally less than the precision printing fine dye. If the process and operation is not properly controlled, the outline of the pattern is easy to osmotically sample and not smooth, or osmotically and irregularly, or the color of the mask is not white and the pattern becomes wilted.
4. Anti-printing printing (anti-pulp printing)
If only in the printing machine to complete the anti-staining or discharge and dyeing the entire process, this printing method is called anti-printing, also known as anti-pulp printing, it is generally first printed Indian paste, and then on it Cover color printing paste, and then in its cover printing paste, India printed paste where the overprint overlay dye due to being infected or discharged and can not hair color or color, and finally removed by washing. Anti-pulp printing can be divided into wet printing and dry printing. Wet anti-India is the anti-India paste and color paste in the printing machine to complete a printing process, but it is not suitable for printing fine lines pattern, overprint easy to make lines thicker, it can be dry anti-India , Generally divided into two times to complete the first printing machine printed on the printing press paste, drying the second time to cover the color paste.
Direct printing, discharge printing and dyeing and anti-dyeing printing and printing four printing process according to the design, the nature of the dye, fabric type, printing effect and the finished product of the color fastness and other requirements to choose. Direct printing process than the discharge, anti-dyeing and anti-stamping simple printing, it is the most widely used, but some patterns must be drawn or anti-stained or anti-stamped printing in order to achieve the desired effect, and discharge printing, anti-dye printing and anti-India Printing process is feasible mainly based on the nature of the dye. In general, the dye determines the process, and the process determines the mechanical equipment, should fully consider the impact of various process factors to implement printing.