The continuous development of printing technology makes offset printing also join the ranks of optical disc printing. It can also be said that it is the emergence of new countermeasures caused by the continuous improvement of the quality requirements of optical disc printing.
At present, the main suppliers of CD offset printing equipment are Germany Kawen, Taiwan Henderson, Crown Printing, Japanese Culture Seiko, Gongyao, etc. They are also the main suppliers of CD screen printing equipment. The intervening of offset printing in optical disc printing brings its excellent quality in paper printing, and injects fresh blood into optical disc printing.
There are two common types of disc offset printing equipment: one is a full-cylinder offset printing equipment, and the other is a combination of screen printing equipment and a back-end offset printing area.
The characteristics of offset printing in CD printing mainly include the following points.
1. Thin ink layer
The ink layer of offset printing is generally 2 to 3 μm. Compared with screen printing, the ink layer of offset printing is thin and the three-dimensional impression is also poor. Correspondingly, the ink photocuring speed is faster, the ink consumption is less, it is not easy to deform the disc due to the shrinkage of the ink, and the impact on the flatness of the disc is small, which is particularly suitable for the printing of DVD discs.
2. Good reproduction of printed graphics
Offset printing is an indirect transfer method, which transfers the pictures and text on the printing plate to the blanket and then to the printing surface of the optical disc. Therefore, the deformation of the dots of the offset printing is small. The disc offset printing is different from the traditional paper product printing. It is all waterless offset printing. Its biggest feature is that it does not require water and ink balance, and the structure of the waterless printing plate is relatively fine. The number of lines of the offset printing can reach 175 ~ 200 lines / inch. The pattern is relatively clear, the texture is strong, and the color reproducibility is good. For example, when printing some transition colors, the effect is better. It is suitable for printing graphics with the theme of characters and landscapes, especially for some mesh-tone products that require multi-color overlay printing. Better results.
3. Less drying times
The substrate printed on the disc is a polycarbonate plastic with high brittleness, and it is easy to warp the disc during printing. Especially in the process of photo-curing the ink, the disc is prone to such quality problems. In screen printing, each color should be dried separately, and offset printing only needs to be dried once after the four-color printing is completed, especially suitable for the printing of DVD discs, because the thickness of DVD discs is equivalent to 2 0.6mm thick CD discs are bonded together, the thickness tolerance is small (CD is 200 μm, DVD is 100 μm), the flatness is also higher, and the number of drying times is less, which will inevitably reduce the possibility of disc warpage.
4. high cost
The cost of offset printing equipment is relatively high. When the CD offset printing equipment was just put on the market, its price was about 5-6 times that of screen printing equipment. Even now, the price of one offset printing equipment can still be purchased by 2-3 screen printing equipment. device.
Many people in the industry are very optimistic about the application of waterless offset printing in optical disc printing. Some people even say that this is the general trend. This printing method with huge potential is respected by many related suppliers and has been rapidly developed.
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