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Bookbinding hot melt adhesive

April 06, 2019

Waterless offset printing plates have been published in Driography from 3M in the United States, and the Toray Waterless version has been introduced by Toray Industries in Japan for 25 years. The changes in waterless offset printing are shown in Table 1. Compared with the first and second generations, the third generation of waterless offset printing has used low viscosity waterless offset printing inks. In addition, the printed matter is no longer a thick ink film printing, but the same thin ink film printing as ordinary offset printing, and other printing workability and stackability are also basically the same as ordinary offset printing.

The improvements in sheet-fed, web-fed printing presses in terms of increased printing speed and automation are endless, but the impact of printing speed on printability far exceeds the expectations of press designers, especially for ink transferability. Has a significant impact.

1. Sheet-fed offset printing ink "Dry-o-Color Artis"

Over the past five years, "Dry-o-Color Artis" has improved the ink transferability, ink receptivity, fixation (pileability, overprintability) and post-processing, while maintaining product gloss and anti-dirt properties. Such as nature, more adapted to high-speed, multi-color sheetfed waterless offset press requirements.

(1) Design ideas. After achieving the low viscosity and low viscosity required for high-speed printing, special additives must be used to further control the anti-dirt properties. To maintain the viscosity and viscosity, only the fluidity of the ink can be further improved to improve the ink's performance. Transferability. The specific approach is:
1 To improve the dispersibility of the pigment, use a high-soluble resin binder.
2 In order to maintain the resistance to scumming, new non-aromatic hydrocarbon solvents that allow rapid diffusion of the printing plate oleophilic resin and the non-image part of the silicon layer were developed.

(2) Ink characteristics. Under the condition that the viscosity and viscosity of the ink are almost the same as those of the original product, the fluidity of the ink is improved by about 15%, and the ink transferability is improved by about 10%.

(3) Market evaluation. Gloss is good, fast fixing; close to the quality of water offset printing; has the same printability as ordinary offset printing ink; ink hiding power is also improved. A few users have suggested that the overprintability of the ink is about 5% lower; the color reproducibility is not exactly the same as with water; the density in the field is slightly inferior to the offset with water.

2. Thermoset type waterless offset printing ink for high speed rotary offset press

Compared with sheetfed printing, Web offset printing has increased the printing speed by about 2 times. It requires higher ink flowability and lower viscosity requirements. Using the same resin design as Dry-o-Color Artis, it is also suitable for rotary waterless offset printing inks, that is, without reducing the CTI (index of occurrence of pasting), using a link material that improves ink flowability to make the ink at high speed Get good transferability when printing.
Research on Waterless Offset Printing Inks

Waterless offset printing plates are composed of an oleophilic resin layer and an oil repellent silicone layer. For waterless offset inks, the most important properties are anti-dirt resistance, ink transferability, and ink/ink properties.

1. Development Points of Waterless Offset Printing Ink

(1) Development towards low viscosity and high mobility

Due to the improvement of paperless paper and recycled paper, and the increase in the amount of paper, in order to increase production efficiency, the printing speed has been continuously improved, and the occurrence of paper picking and printing plate stacking has subsequently occurred. Waterless offset printing Because the fountain solution is not used, the viscosity of the ink on the paper surface is higher than that of the offset printing with water and is more prone to pick-up and stack failure. Therefore, the low viscosity and high fluidity of the ink is an innovation of the ink technology. The essential.


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