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.
A training chair is a seat designed specifically for activities such as training and meetings. It has the characteristics of comfort, durability, and ease of movement, which can meet the needs of different groups of people. Training chairs can be classified into various categories based on material, structure, function, and other aspects. Below will be a brief introduction to the classification of training chairs.
1. Material classification
The materials of the training chair mainly include metal, plastic, and fabric. Metal training chairs typically have strong stability and durability, making them suitable for long-term meetings or training activities. The training chair made of plastic material has the characteristics of lightweight and easy to clean, making it easy to arrange the meeting site at any time and suitable for use in multifunctional halls and other places. The training chair made of fabric has a comfortable sitting experience and good breathability, making it suitable for long-term meetings or training activities.
2. Structural classification
The structure of training chairs mainly includes single chairs, linked chairs, and foldable chairs. Single chairs are the most common training chairs, with each seat being independent and adjustable as needed. Chainage refers to the connection of multiple seats together, usually in the form of one or more rows, suitable for use in large training venues. Stackable chairs are training chairs that can be folded and stacked, saving space and facilitating storage and handling.
3. Functional classification
The main functions of the training chair are adjustable, rotatable, foldable, and storable. The adjustable training chair can adjust the height and angle according to personal needs, providing a more comfortable sitting posture. The rotatable training chair can rotate 360 degrees, facilitating communication and interaction with people around it. The foldable training chair can be conveniently stored and transported, making it suitable for use in multifunctional halls and other places. The training chair that can store items is designed with storage space below or behind the chair, making it convenient to store items such as stationery and documents.
In summary, the classification of training chairs mainly includes material classification, structural classification, functional classification, etc. Choosing a suitable training chair can provide a better user experience and improve the effectiveness of training and meetings.
Meeting Chair,,Foldable Chair,Customized Chair
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