On the application of water free offset printing i

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On the application of water free offset printing in label printing

in the future, water free offset printing will become the mainstream way of label printing together with flexo printing for two reasons: People's increasing requirements for label printing quality; Waterless offset printing has made great progress in technology, equipment, materials and technology, and has attracted more and more attention from people who have problems in the food industry for many times

characteristics of traditional printing

1. Photosensitive resin letterpress printing

has low cost, but in terms of printing quality, no matter color or level of detail, it is not as good as other printing methods. It can only be used to print some simple line patterns, and will not become the mainstream of label printing in the future

2. Flexographic printing

(1) the loss of highlight level is serious, and the printing plate with high elasticity leads to serious point increase, which makes the printing plate prone to bending deformation in printing, resulting in the deformation of print imprint, which restricts the development of flexographic printing technology

(2) the number of pattern stitching is not high. The number of mature stitching is limited to about 133 lines/inch, and the level of detail of the pattern is not as rich as offset printing and gravure printing

3. Intaglio printing

although the ink color of intaglio printing is bright, its biggest disadvantage is that there are jagged edges on the edges of words and patterns, which affects the level of detail of the highlight part of the print, especially small words, and the jagged edges make it not clear enough. For high-end labels, gravure printing has certain limitations; In addition, the ink used in gravure printing has great pollution to the environment. In Europe and the United States, users can refer to the article "details of nonwoven tensile testing machine" for details. Some countries have restricted the development of gravure printing, so gravure printing will not do much in the future label printing industry

4. silk printing

although silk screen printing has bright ink color and good three-dimensional effect, its registration accuracy is poor, and it is only suitable for printing products with single color

advantages and disadvantages of waterless offset printing

1 Advantages of anhydrous offset printing

(1) high number of lines added

the printing plate structure of anhydrous offset printing has become a widely recognized safety material, which is similar to gravure. The image and text part under ink is concave, which reduces the probability of ink spreading under the action of printing pressure, greatly reduces the point increase rate, and greatly improves the number of lines added to the product. At present, the number of extra lines of waterless offset printing products can reach 300 lines/inch, or even higher; Other printing methods currently do not exceed 200 lines/inch, and the image detail level of waterless offset printing products is rich, which meets the requirements of labels in image texture

(2) bright colors

the ink color of waterless offset printing products is bright, with a wide color gamut, and the ink color of the products is always stable, which meets the high requirements of labels in terms of color. Because there is no water in the printing process, ink emulsification will not occur, nor will it cause color saturation reduction or ink color change

(3) high production efficiency

production efficiency Honeywell has invested nearly $350million so far, with a high rate, less preparation time before printing, saving labor and reducing paper waste. Without the participation of water, the time of ink color matching and registration of various color plates in the printing process is greatly reduced

(4) conducive to environmental protection

because there is no water in the anhydrous offset printing, there is no need for various chemical additives in the traditional offset printing fountain solution, such as ethanol, isopropanol and other substances that pollute the environment

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