In recent years, textile printing using the principle of four-color separation has gradually attracted attention. The color patterns of textile crafts and cultural shirts that are currently prevalent in the market are printed in four-division colors.

Electronic filming: deliver the manuscript to be printed to the unit that holds the computer screen printing color separation and plate-making system for image scanning, layout planning and production, until the output of electronic filming. It is best to choose 35-80 lines / inch for the frequency modulation dots of the electro-division film, and the photosensitive drug film is on the front of the film. The number of dots and lines of the electronic sub-film should be selected according to the size of the printed product and the distance between the visual inspection and the printed matter. Usually, the production of advertisements pays attention to the results of long-distance viewing (1 meter higher than the visual distance). The number of lines selected is 35-40 lines / inch, and the selection of screens is preferably 200-300 meshes. For textile printing and handicraft printing, the number of dot lines should be higher, usually 55, 60, 65, 70, 80, 100 lines.

Rinse and develop: Wet both sides of the screen with tap water. After softening for 1-2 minutes, rinse the printing surface with a small high-pressure water gun. The pressure should not be too large during the processing until the screen reproduces the negative. Then rinse both sides of the screen with tap water until there is no softened photoresist residue. Dry the screen, repair the pinholes, and expose again to increase the durability of the screen.

Photosensitive adhesive coating: first wash the four screen frames with washing powder or cleaning liquid. After drying, choose a sizing device with a sharp blade. The width is best to be close to the inside of the printing plate. First coat the scraping surface once, then turn the screen upside down, then coat the scraping ink once, and apply the same method to the printing surface twice, the film thickness is preferably 20 microns. The sizing should not be too thick, otherwise the dots will spread easily. After the coating is finished, arrange the screen to dry horizontally. The drying should not exceed 30 degrees Celsius, and then blow it with a fan. The darkroom environment should be clean and dust-free.

Exposure: In order to keep the bottom of the film close to the glass during exposure, it is best to use a vacuum exposure box. The float glass is used to eliminate the refraction, otherwise it will affect the clarity and discrimination of the screen. It is best to choose a revision box when attaching the film. First, align the four film rules with 100%. The background of the revision box should be pre-ordered. It should be aligned with the background of the regular platen printing. And screen, and then put it on the photosensitive table to expose. In this way, when it comes to formal printing, the alignment is much easier.

Stretching the Net: Use diagonally stretched essentials. Generally, the dot angles of various colors are applied: the yellow version is 90 degrees, the blue version is 75 degrees, the red version is 15 degrees, and the black version is 45 degrees. If the screen mesh number is 5-6 times higher than the number of dots of the electric slicing network, a straight-line method can also be used. For example, it is allowed to guard against the headache-like tortoise pattern in the four-color screen printing. The most tense rule for stretched screens is that the screen tension in the four printing screen frames should be the same. If the tension is different, it will cause the screen to stretch different lengths during the printing process, resulting in inaccurate overprinting.

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