The difference between silk screen and offset printing
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First, the characteristics of silk screen:
(1.) The ink layer is thick. Advantages: bright colors, giving a very full feeling, strong stereo, suitable for large areas of the field, text and other patterns. Disadvantages: The ink consumption is large, about 3 times thicker than offset printing, the light curing speed is slow, the ink film shrinks more obviously, and it is easy to cause shrinkage of the disk, or even bending, which causes quality problems.
(2.) Low precision. Limited by the screen printing process and raw materials, the screen printing image accuracy is 80-120 lines/inch, and the dot-tone reproduction range is generally 10%-85%, so the product has a delicate degree and layering.
(3) The printing pressure is small. Screen printing is soft and flexible, and the printing pressure is small, which has little influence on the content of the optical disc, and is beneficial for protecting the optical disc.
Second offset printing features
(1) The ink layer is thin. The ink layer is generally 2-3μm, compared with the silk screen printing, the ink layer is thin, and the stereoscopic effect is poor. Correspondingly, the ink light curing speed is fast, the ink consumption is small, and the deformation of the disk is not easily caused by the shrinkage of the ink. It has little effect on the flatness of the disc.
(2) The printed image has a good reproduction effect. It belongs to the indirect transfer method, which transfers the graphic on the printing plate to the blanket and then transfers it to the printing surface of the optical disc. Therefore, the offset of the offset printing dot is small. Waterless offset printing, its biggest feature is that it does not need ink balance, and the structure without watermark is relatively fine, the number of lines can reach 175-200 lines/inch, the printed pattern is clear, the texture is strong, and the color reproducibility is good. For example, when printing some over-colors, the effect is better, and it is suitable for graphics and themes with characters and landscapes.
Third, so it is better to say that there is no such thing as silk screen printing and offset printing. It should be made according to the pattern of the disk.