Screen printing technology and color application o

2022-09-27
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Printing process and color application of flower and bird painting (Part 2)

when scraping with a glue applicator, first pour the photosensitive glue into the glue applicator, accounting for about 1/3 of the volume, and choose different glue applicators for the size of the visual frame. First, place the frame firmly at an angle of 85 °, and the glue applicator should be flat. Scrape the glue from bottom to top for 1 ~ 2 times on the front and 1 time on the back. Check if there is any missing scratch, and then dry it with an oven or a hot air blower. Note that when blowing hot air, it should be about 30cm away from the layout, swing back and forth in order until it is completely dry, and cover it tightly with black velvet cloth for standby. The above operations should be carried out under the red light in the dark room

when scraping with a triangle, first pour the glue on the front side of the frame, and then slowly scrape it with a triangle. The reverse side is also easy and fast to operate; Dry after scraping. The temperature shall be kept at 30 ~ 45 ℃, so as to avoid overheating the glue and forming thermal cross-linking, and the glue film will not fall off during development

place the dried version on the flat glass plate, with the concave side facing up, pad it with black or red velour cloth below, and clamp it with a clip. Then put the glass with the bottom plate on the plate, clamp the glass with a deep clip, and dry the hard plate under the plate light box for 3 ~ 5min. The iodine tungsten lamp should be kept about 40 ~ 50cm away from the layout to avoid overheating and opaque development. The distance of ultraviolet cold light lamp should be closer, and the printing plate should be printed for about 5min. Ultraviolet light is harmful to human body. It is green to see things with your eyes for a long time. You should avoid observing with your eyes for a long time. If possible, wear protective glasses. You can also print with a vacuum printer. In short, it depends on the conditions

the exposed version is developed in warm water for 2 ~ 3min, and the water temperature is about 30 ℃. When the developing place is powdered, grasp the two corners of one side with your hand, and gently vibrate up and down, the pattern will slowly appear, and the part that blocks the light begins to fall off, forming a perforated plate. Spray from the reverse side with a high-pressure spray gun, with a distance of 30cm. All patterns pass through the workpiece. It is required to drill holes until it is fully operated during bolt or riveting assembly. Spray it from the front to expose the white air holes. Check the pattern against the sunlight until it is transparent. Don't spray too much. Long spraying will affect the accuracy of the edge of the pattern. Then dry the water, or soak it with a new towel. Don't wipe it, just press it up and down, and then put it in the oven to dry it in summer. The dried version is filled with sand holes, holes, etc. with the original photosensitive adhesive, and then baked again for 10min to make it fully cross-linked. You can also re expose it for 10min, brush it with dura mater, and dry it. This strategy has good versatility, and the purpose is to increase the printing resistance

the scraper can be self-made. Use a 0.8 ~ 1cm thick rubber strip to cut a piece as needed, and then use a 2cm thick wood board to make a groove, and insert the rubber strip into the groove. The cutting edge shall be planed into two side slopes or one side slopes with a plane, leaving 2 ~ 3mm in the middle. The grasping surface is planed into a semicircle, and it is appropriate not to raise your hand

scrapers can also be purchased for ready-made use, including soft, hard, long and short ones. Round mouth is suitable for printing rubber, with a large amount of ink, but it is not suitable for fine printing. The oblique mouth is suitable for printing metal ink and is thin. The sharp mouth is suitable for printing paper, and the flat mouth is suitable for cloth, etc., which can be flexibly used according to the purpose

the printing materials used for fine brushwork flower and bird paintings can be prepared with cherry blossom paste, fine white powder, Huabiao white emulsion and Yidege ink. The formula is as follows:

Cherry Blossom paste: a bottle of about 500g

titanium dioxide 10g

Huabiao white emulsion 25g

Yidege ink 20ml

the prepared printing materials are still for 4h, covered with plastic film, and do not peel

when printing lines, don't print too black, the ink color is too heavy, it seems rigid, the effect is not good, and it's not easy to hook up the line to make up the color

when printing silk, you can use the color paste. Add an appropriate amount of white paste into the black, and adjust it into a clear ink shape, then you can use it

in order to print the line manuscript well, cut paper and silk according to the design needs, and use wood or glass slightly larger than paper and silk. Flatten the paper and silk, stick it with adhesive tape, flatten it by hand, and then stick it with another piece of adhesive tape

the preparation of printing materials during printing is very critical to prevent the ink from seeping and running during mounting, which will be out of control and waste labor and materials

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