Color Screen Printing Technology Application:
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Screen printing is an ancient and unique printing technology. The author once described the application of screen printing technology in the title of “Application of Any Light Box Advertising in Color Silk Screen Technology” in the “China Printing” magazine, 2001. Screen printing has advantages that are not available in other printing methods. It accounts for a large proportion of the application of various types of outdoor advertising, and has the advantage of being capable of mass copying and low cost.
(1) The key to color silk screen printing lies in the continuous color-tuned image making process. The key issues to be considered in the plate making process are the following:
a. The enlargement of the image must take into account the proportional relationship of the screen.
b. The original version of the normal situation is positive, but if it is printed on the transparent material surface, the original version should be positive.
c. The angles of the screens of the yellow, magenta, cyan, and black four-color films should consider the effect of the warp and weft squares of the screen on the color reproduction, in addition to avoiding mutual interference.
(2) Matters needing attention in material selection and process:
a. All four frames must use metal frames, and the specifications must be exactly the same.
b. Wire mesh should be screened with a high-precision, halo-resistant dyeing screen. The number of meshes is determined by the magnification of the printed pattern.
C. When stretching, the four plates should be on the same device or under the same conditions. It is advisable to use the “one net stretch four” method to ensure that the tension and accuracy of the four frames are consistent. The stretched mesh should be placed for 1 to 2 days before use to ensure that it is fully "relaxed."
d. The direct method is used to make the template, and the coating thickness of the photosensitive adhesive should be uniform. Keep the pumping, light source, exposure time, and development on the same rung (with the step scale). The template should be kept and used under the specified conditions.
e. A large-scale or precision screen printing machine is used for printing. The temperature between the operations is controlled between 18°C and 25°C, and the humidity is controlled within the range of 50% to 70%.
f. The printing distance should be as small as possible in order to improve the overlay accuracy and reduce the moire phenomenon.
g. The length of the squeegee should be the same and the pressure should be low. The squeegee angle is about 75° to 80°, and the hardness is slightly larger, ie, the Shore hardness is about 70, and the cutting edge should be sharp.
h. The uniform ink should be thin (approximately 20 μm) and uniform to prevent the ink from filling the mesh.
i. The choice of ink must match that of the receiving material, and the spectral characteristics of the three primary inks are better, the transparency is higher, and the viscosity can be slightly larger, so that the network stands up and avoids enlargement. Slow-drying, imprinted, fast-drying inks on plates should be used.
j. Various substrates must be processed properly before printing.
k. Printing color sequence is generally used to print darker non-principal color, after the main color printing, in order to overprint: If the color sequence on the transparent plastic material should be reversed mining, and need to first print the background color, and then press Color sequence overprinting.