Screen printing is a kind of screen made into a flower pattern. When printing, the flower pattern is covered on the textile, and the printing paste is added on the flower pattern, and it is printed on the textile under the effect of the squeegee to make the pattern of the textile. The printing method. The method has the advantages of simple plate making, unlimited pattern, and low cost. No matter which industry is used for screen printing, screens of different materials are used as carriers of the film, but there are some differences in the selection of screens and plate making processes.
1, prepress processing
Prepress processing includes pattern design and description of black-and-white color separation (ie, positive film). Generally, continuous photolithography is used in the continuous shooting process, and the photosensitive material for plate making needs to be water-resistant.
2, screen material
Screen material is the main material of screen printing. The screen weaved with silk has long been replaced by nylon screen. Although the nylon screen has high strength, wear resistance and elasticity, it is susceptible to changes in temperature and humidity and is flexible. Larger, thus affecting the accuracy of the overlay, so when printing high-end products, polyester (polyester) screens are commonly used.
In addition, metal screens such as nickel screens for screen printing and stainless steel screens for circuit boards are also used. There are many kinds of screen specifications, with a width of 90-230cm and a mesh size of 31-196 mesh/cm, which can be selected according to different applications.
3, screen printing equipment
Screen printing equipment is very complex, ranging from simple family workshops to modern complete sets of equipment. Textile screen printing is divided into round net and flat net. Flat net equipment includes printing platen, automatic flat screen printing machine and rotary printing machine. The maximum width of the automatic flat screen is 3.2m, the length is about 60m, and the maximum color is 24 colors, which belongs to large-scale equipment.
Textile screen printing is generally continuous printing, even if the independent pattern of handkerchiefs, tablecloths, etc. are also obtained after the continuous printing and cutting, and garment clothing and shirts are mostly rotary printing.
4, material differences
The difference in printing materials is simply the difference between water and solvent (oily). Textile printing is generally based on dyes, especially on silk textiles. It is necessary to adopt corresponding dye technology and supporting equipment according to the nature of different fibers. The printing is made of coating printing paste as printing material, and some people call it water-based ink.
Due to practical requirements, the color of textile screen printing must have a certain fastness (not easy to fade). At the same time, due to the large change in color, the paste and color are generally sold and stored separately, and the printing paste is used as required. .
In addition, there are many special functional coating printing pastes, such as foaming inks, bright inks, fluorescent inks, etc., which are often not limited by the nature of textile fibers, and therefore occupy a certain position in the coating screen printing, in recent years screen printing Ink varieties are also increasing.
5, post-press processing
In the screen printing process of textiles, post-press processing is very important. It must be fixed by high-temperature steaming or baking so that the dyes can be combined with textile fibers to ensure the color fastness. In addition, after fixing, it should be washed with water to remove the carriers and unfixed dyes in the printing paste, so that the color is bright and shiny.
It should be noted that high-temperature baking is required even if the coating process is used, but it may not be washed. Non-textile screen printing is generally simple, but it is also necessary to take some necessary treatments according to the quality requirements of printed products, such as the UV curing of UV inks.
1, prepress processing
Prepress processing includes pattern design and description of black-and-white color separation (ie, positive film). Generally, continuous photolithography is used in the continuous shooting process, and the photosensitive material for plate making needs to be water-resistant.
2, screen material
Screen material is the main material of screen printing. The screen weaved with silk has long been replaced by nylon screen. Although the nylon screen has high strength, wear resistance and elasticity, it is susceptible to changes in temperature and humidity and is flexible. Larger, thus affecting the accuracy of the overlay, so when printing high-end products, polyester (polyester) screens are commonly used.
In addition, metal screens such as nickel screens for screen printing and stainless steel screens for circuit boards are also used. There are many kinds of screen specifications, with a width of 90-230cm and a mesh size of 31-196 mesh/cm, which can be selected according to different applications.
3, screen printing equipment
Screen printing equipment is very complex, ranging from simple family workshops to modern complete sets of equipment. Textile screen printing is divided into round net and flat net. Flat net equipment includes printing platen, automatic flat screen printing machine and rotary printing machine. The maximum width of the automatic flat screen is 3.2m, the length is about 60m, and the maximum color is 24 colors, which belongs to large-scale equipment.
Textile screen printing is generally continuous printing, even if the independent pattern of handkerchiefs, tablecloths, etc. are also obtained after the continuous printing and cutting, and garment clothing and shirts are mostly rotary printing.
4, material differences
The difference in printing materials is simply the difference between water and solvent (oily). Textile printing is generally based on dyes, especially on silk textiles. It is necessary to adopt corresponding dye technology and supporting equipment according to the nature of different fibers. The printing is made of coating printing paste as printing material, and some people call it water-based ink.
Due to practical requirements, the color of textile screen printing must have a certain fastness (not easy to fade). At the same time, due to the large change in color, the paste and color are generally sold and stored separately, and the printing paste is used as required. .
In addition, there are many special functional coating printing pastes, such as foaming inks, bright inks, fluorescent inks, etc., which are often not limited by the nature of textile fibers, and therefore occupy a certain position in the coating screen printing, in recent years screen printing Ink varieties are also increasing.
5, post-press processing
In the screen printing process of textiles, post-press processing is very important. It must be fixed by high-temperature steaming or baking so that the dyes can be combined with textile fibers to ensure the color fastness. In addition, after fixing, it should be washed with water to remove the carriers and unfixed dyes in the printing paste, so that the color is bright and shiny.
It should be noted that high-temperature baking is required even if the coating process is used, but it may not be washed. Non-textile screen printing is generally simple, but it is also necessary to take some necessary treatments according to the quality requirements of printed products, such as the UV curing of UV inks.
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