Screen Printing Process Applications and Features Printing Methods

First, work hard on the draft: The density of the screen in the corrugated box printing process will affect the graphic effect. Too dense can easily cause stencils; screens that are too thin can lose graphical detail. It must be accurately grasped during the production process. There are two kinds of graphic bitmaps and vector diagrams. The screen processing method is different. For vector diagrams, gray scale is controlled, and gray levels are used to represent levels. The size of gray scale determines the screen size and thinness. Handle the scanned image.

Second, convert to grayscale mode, and then use the PHOTOSHOP filter Pixelatecolorhalfone to deal with, the size of the screen should be adjusted according to the graphics grayscale parameters in the colorhalfone dialog box to get the screen graphics suitable for printing conditions.

After the completion of the post-vector graphics and bitmap processing, the negative output of the printing plate must be output via the output center. The number of output screen lines also determines the important parameters of the screen number of the graphic. The larger the screen number, the more the number of screens will be output. Be sure to choose the right number of network cables.

Third, in the screen printing process, when the screen graphics are produced, the grayscale graphics of the vector graphics and the number of output network lines, as well as the halftone processing pattern of the output network lines and the bitmap should be taken into consideration in order to obtain the overall network section. Shape effect. Under normal circumstances, as much as possible, the screen printing pattern and the large-area color pattern are prevented from being printed on the same block. If the large area color pattern and the screen printing pattern are separately printed, the pressure adjustment and the color control are much simpler. After the design draft is output as a negative film, the plate can be plated. The resin plate used for screen printing is required to have a high hardness of 45. -50. ShoreA is suitable, and the material with low elasticity and slow denaturation recovery can ensure better reproducibility of the screen printing pattern. The production of the silkscreen resin plate on the same product package is carried out as much as possible at one time.

Fourth, it is extremely easy to see differences in the depth of screen printing at different times, resulting in different effects. If the screen plate cannot be processed at one time, the back-exposure, main exposure, rinse, drying, de-sticking, and post-processing time must be strictly controlled during the plate making, so that each processing data is consistent, so as to obtain the same effect of the screen resin plate. When designing a screen graphic, it is also important to consider the number of screen lines of an anilox roller in a company's printing press. Correct selection of the anilox roller is very important and determines success or failure. The plating roller is the most common type. With the widespread use of back-scraping blades and the promotion of new high-speed printing presses, rapid wear of the anilox roller is a problem. Many companies have started to use ceramic ink rollers with wear resistance. Its grace is good for screen printing. When the same color printing includes full plates and screens, the thickness of the full plate portion can be increased by 0.15 to 0.30 mm in favor of improving the plate pressure and the printing pressure.

Fifth, there will be screen enlargement during screen printing. The printer is required to make detailed records of the adjustment parameters of the printing press. At the same time, the pressure adjustment should be as light as possible to obtain the smallest screen expansion, so that the same printing can be traced later. effect. After printing, the screen resin plate should be immediately cleaned to prevent the ink from drying on the plate, causing the screen to clog, resulting in a bad plate. In order to ensure the quality of printed screens.