Screen printing of the hottest fabric with color m

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With the development of chemical fiber industry, silk screen printing flowers are more and more widely used in the decorative processing of blended, interwoven and purified fiber fabrics. Silk screen printing flowers are no longer limited to monotonous line and color block printing, but are more and more used in color eye tone printing. With the development of color halftone printing, the varieties of fabric printing have been increased, and the market of fabric printing has been widened. It has a broad development prospect

I. characteristics of color eye tone silk screen printing

the traditional textile printing process can only print lines and color blocks on textiles. If you want to make color photos, paintings, color pictures and other originals realistically copied on textiles, it cannot be achieved by traditional printing process. Due to the development of Printing Science, color eye tone printing has been realized in flat, concave and convex printing, which provides the possibility for eye tone printing of textiles

domestic research on the color screen printing process on fabrics has begun. In recent years, the United States, Japan and other developed countries in the textile and silk screen printing industry in the world have developed the direct color screen printing process on fabrics, which are respectively used for knitting T-shirts, tourist goods and oil painting reproduction. The process has vivid printed images, strong three-dimensional sense, rich colors and layers, no environmental pollution and no restrictions on fiber varieties

the color eye tone printing process breaks through the current traditional printing methods of human drawing (color manuscript), hand drawing (ink manuscript), color block patching, one color one version and multi color multi version, and establishes the color tone of fabric printing on the basis of light and shade level changes and visual theory, Thus, the following process of the printing process is formed: shooting → editing → production → original → adding → color separation positive picture → silk photosensitive plate making → printing paste modulation → printing → post-processing → production → finished product

color eye tone printing E) the process design of switching on power supply must be based on the product pattern requirements. After the design of the original is determined with the yarn, density and grain of the fabric, the number of lines added to the positive picture and the angle difference between the positive pictures shall be selected

match the silk of corresponding mesh number according to the number of lines added in the color separation positive picture, screening and modulation of three primary color printing paste, and arrangement of various color silk plates in the printing operation. These are the process design conditions that need to be formulated first in color eye tone printing

II. Color eye tone silk printing process

color photos, pictures, oil paintings, gouache and other paintings use color changes to represent objects and space. The process principle of reproducing color originals on fabrics by silk pigment printing is based on visual theory. According to the principle of color separation, with the help of an electronic color separation machine, the color originals with complex color changes are divided into monochrome dot positive plates with yellow, magenta and green primary colors. After the color separation positive plates are made into silk plates by the photosensitive plate making method, the monochrome images are overprinted together with the yellow, magenta and green primary color coating printing pastes, and the color originals are reproduced on the printed fabric

1. Positioning device. The error of color eye tone printing overprint is allowed to be within 1mm. To make the overprint accurate, the cooperation of positioning device is very important. In the paper printing, the eye tone color image is positioned by cross hairs. In the fabric eye tone color printing, one method is to use the positioner of the printing plate and the printing table to position the color plates, and the other method is to use the visual positioning method when manually printing small area images. For mechanical and manual printing, the positioner shall be used for accurate overprint and high production efficiency. The matching clearance of the positioning nail in the positioning hole shall not be greater than 0.1mm

textile silk printing tables are equipped with different types of positioners to ensure accurate positioning. There are two forms of textile silk printing: one is that the printing plate does not move, which is mostly used for manual printing; One is the cloth version, which is mostly used for flat machine printing. There is no fixed mode for the form to be adopted, which depends on the specific situation. At present, the positioning of the printing table is generally plug-in

2. Printing essentials. During the printing process, there are many factors that need to be adjusted or controlled, whether it is mechanical or manual according to the segmentation of the aluminum powder target market. Especially for manual operation, various factors should be adjusted by people. The operation essentials of silk printing on fabrics are: concentrate on ideas, push force of scraper should be uniform, the angle should be consistent, the slurry should be balanced, and the slurry collection should be clean. In the process of operation, the effective space for experiment shall be: 0 ⑶ 000mm operation, edge inspection and mutual inspection, and the overprint shall be accurate, the thickness shall be uniform, and the depth shall be consistent. The printing plate arrangement principle is first deep then shallow, first fine then coarse

the hardness of the scraper and the table has a great impact on the eye tone printing. Dot printing requires a high degree of clarity. The non textile surface is smooth, the texture is crisp, not easy to deform, and the dot definition is guaranteed. While the textile has moisture absorption, the surface is not smooth, and has fabric holes. It is very important to know how to print clearly and how to master scraping

the influence of the color giving amount on the color printing is various. In the textile color block screen printing, the color giving amount only affects the depth of the printing tone, while it has a much greater impact on the dot color printing, because the colors in the dot printing pattern are realized by the overlap and juxtaposition of dots. If the paste layer of a color is slightly different, it will be immediately reflected in the performance of the tone. Therefore, it is necessary to strictly control and master the consistency of the color giving amount (pulp giving amount)

the distance between the printing plate and the substrate has little effect on the quality of finished products in textile color block silk, but it is very important in dot color printing, which should be paid attention to by the operator

3. Characteristics of printing paste for eye tone printing. The pigment printing paste used for eye tone color printing has three colors: yellow, magenta and cyan, and a black needs to be added during actual printing, so eye tone color printing is also called four-color color printing. This kind of printing paste is water-soluble. At present, various fluorescent printing pastes have been developed. The requirements for pigment printing paste for eye tone color printing should not only have correct hue, but also have certain transparency, viscosity, drying speed and fastness

transparency. Eye tone color silk printing reproduces the color and tone of the original by point stacking and juxtaposing, which requires a certain transparency of the printing paste. The transparency of the color paste can be observed through experiments. The experiment is to scrape and print the color paste on the paper with dark blue patterns, and observe the clarity of the original patterns after drying to know the transparency of the printing paste.? Viscosity. In order to make the dots on the printing plate appear clearly and smoothly on the fabric, there are certain requirements for the viscosity and thixotropy of the printing paste.? Drying rate. The drying speed of printing paste is directly related to the durability of printing paste, and also determines the printing interval between colors

4. Color mixing of printing paste. The color blending of printing paste is an important link in the process of printing production. The basic principle of blending is inseparable from the basic principle of pigment subtraction method

in order to obtain the ideal color size, we must: understand the various specifications and properties of the printing size, so that the matching printing size can meet the production needs; Master the basic knowledge of chromatics and use it freely in color matching; The color and process technology of printing are analyzed to find out the color sequence of chromatic registration, so as to avoid wrong color sequence, mixing of two colors and color change; When mixing colors, you should also pay attention to the primary color as much as possible, otherwise it is easy to make the color "gray"

5. How to improve the product quality of eye color printing. How to evaluate the quality of fabric color eye tone printing products is a very complex problem. For example, the printing industry attaches great importance to moire defects, while the textile industry holds different views on this. At present, the evaluation of fabric color tone printing quality focuses on the degree of reproduction of the original, which should include three contents: whether the tone restoration is complete, whether the color restoration is accurate, and whether the clarity meets the requirements

the appearance artistic effect of fabric printing products is very important to the market value of the products. The products should be clean and tidy, and reflect the characteristics of the fabric. The overall artistic effect should be beautiful and coordinated. In addition, attention should also be paid to the packaging and decoration of products

6. The main defects and preventive measures of color matching printing. Most of the common defects in silk fabric printing occur in the printing process and post-treatment. In practice, analyzing the causes of defects according to specific conditions and taking corresponding measures are good ways to prevent defects in fabric printing. On the one hand, the oil refining industry has excess capacity. The causes of fabric printing defects can also be analyzed according to silk screen printing defects. (author: Anshan Xinhua Printing Factory)

Author: zhengdehai... Source: silk printing process

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