Discussion on the characteristics and process of t

2022-08-12
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Discussion on the characteristics and process of the floral paste of color mesh silk printing

special printing of printed fabrics improves the added value of goods and beautifies life for textiles. Because special printing is widely used, it also promotes the development of silk printing technology

color photos, pictures, oil paintings, gouache and other paintings use color changes to express objects and space. The process principle of reproducing color originals on fabrics by printing with plate paint is based on visual theory and when exploring the new development path of plastic granulator technology. According to the principle of color separation, with the help of electronic color separation machine, the color manuscript with complex hue changes is divided into monochrome dot positive plate of yellow, magenta and cyan. After the color separation positive plate is made into silk plate by photosensitive plate making method, the monochrome images are overprinted together with yellow, magenta and cyan coating printing paste, and the color manuscript is reproduced on the printed fabric

positioning device

the error of color eye tone printing overprint is allowed to be within 1mm. In order 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 crosshairs. 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. The positioner is used for mechanical and manual printing, with accurate overprint and high production efficiency. The matching gap of the positioning nail in the positioning hole shall not be greater than 0.1mm

textile printing tables are equipped with different types of locators 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 printing table is generally plug-in

printing essentials

in the printing process, whether it is a mechanical or manual printing machine, there are many factors that need to be adjusted or controlled. Especially for manual operation, various factors should be adjusted by people. The operation essentials of silk printing on fabrics are: concentrate your thoughts, push the scraper evenly, keep the same angle, take the pulp evenly, and finish the pulp cleanly. In the process of operation, it is necessary to operate, check and check each other at the same time, and ensure accurate overprint, uniform thickness and consistent depth. The principle of printing plate arrangement is first deep then shallow, first thin then thick

the hardness of the scraper and the table has a great impact on the eye tone printing. Dot printing requires extremely high definition. The non textile surface is smooth, the texture is crisp, and it is not easy to deform. The dot definition is guaranteed, while the textile is hygroscopic, the surface is not smooth, and there are fabric holes. How to print the dots clearly and the proficiency of scraping is very important

the influence of color giving amount on eye color printing is multifaceted. In the textile color block printing, the color giving amount only affects the depth of the printing tone, but 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 tone. Therefore, it is necessary to strictly connect the oil source electromechanical 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 printing, but it is very important in dot color printing. This should attract the attention of the operator

characteristics of eye tone printing paste

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

(1) transparency

the color and tone of the original is reproduced by dot stacking and juxtaposition, which requires a certain transparency of the printing paste. The transparency of the printing paste can be observed through the special broaching machine for the notch of the impact sample. The experiment is to scrape and print the printing paste of various colors on the paper with dark blue patterns, and observe the clarity of the original patterns after drying, so as to know the transparency of the printing paste

(2) 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

(3) drying speed

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 blending of printing paste

color blending of printing paste is a link that cannot be ignored in the process of printing production. The basic principle of blending is inseparable from the chromatic light addition method and the pigment subtraction method

in order to obtain the size with ideal color, we must: understand the specifications and properties of printing paste, so that the matching printing paste can meet the production needs; Master the basic knowledge of chromatics and use it freely in color matching; Analyze the color and process technology of printing, and find out the color sequence of chromatic registration, so as to avoid the wrong color sequence, the two colors are miscible, and the color changes; 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"

product quality of color eye tone printing

how to evaluate the quality of color eye tone printing products of fabrics 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 the quality of fabric color eye tone printing focuses on the degree of reproduction of the original. It should include three contents: whether the step restore is complete; Whether the color restoration is accurate; Whether the clarity meets the requirements

the artistic effect of the appearance 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, we should also pay attention to the packaging and decoration of products

5. Main defects and preventive measures of eye tone color printing

most of the common defects in fabric silk printing occur in the printing process and post-treatment process. In practice, it is a good way to prevent fabric printing defects by analyzing the causes of defects according to the specific situation, condensing the development strength and taking corresponding measures

information source: silk printing

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