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Technical problems to be noticed by screen printing plexiglass

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First, several links that should be paid attention to in the screen printing of plexiglass signs

               1.

           Printing inks should use high-gloss, anti-friction plexiglass inks, especially matte inks can not be used for surface printing, because this ink is not resistant to friction and the color is not gorgeous. For outdoor light boxes and signs, you should also use imported inks with good lightfastness to resist the exposure of strong light and prolong its service life.


           2. The printing film cannot be replaced by laser printing or sulfuric acid paper. It must be a positive or negative film output by a professional manufacturer. When outputting, it is necessary to output a blank film with a positioning crosshair. When printing the plate, first attach the blank cross-hair film to the glass plate with transparent tape. The film of other colors should be based on this, so that the position of the screen can be consistent.


           3. For fine screen printing, high-resolution imported photosensitive adhesive and imported wire mesh with high tension and low stretch rate must be selected. For example, SBQ single-liquid photosensitive adhesive, NBC mesh and other famous brand products produced by Murakami Corporation of Japan, although the price is more expensive than domestic ones, the screens produced are clear, the edges of the graphics are neat, and multi-color overprint or four colors are also guaranteed. The accuracy of the position when screening. If the text is too small, the lines are very thin, and the 350 mesh screen can be used. At the same time, the imported ink or light curing ink should be equipped with fine grinding.



           4. Screen printing color matching is generally carried out by the experience of the printer. Since the mesh size of each batch is different, the thickness of the photosensitive film is not the same, which often causes the color cast of the printed product. "The color of the ink in the barrel is not accurate. "Seeing the truth after the last version of the scrape" is explaining this truth. Therefore, each batch of live must use a well-developed screen to test and print samples, and the customer can confirm the color of the original before entering the official printing.

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               5. Large format paintings must be printed on a screen printing machine, and small areas can be printed on an inhalation printing station. During the printing process, six consistency should be maintained: a.

           The multi-color screen version should be consistent; b. The squeegee speed is consistent; c. Scratch pressure is consistent; d. The consistency of the ink remains the same; e. The hardness of the size scraper is consistent when hand-scraping; f. The temperature and humidity of the printing shop remain the same.


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