Innovative Application of Paper Packaging Printing Technology (II)

(2) FM screening technology

The quality of the printed matter is mainly determined by the number of dots on the unit area and the number of successively changing series of dots from small to large. The larger the number of Internet sites in the area, the higher the clarity of the printed matter, the greater the number of changes in the outlets, and the stronger the expressiveness of the print level, the finer the look.

In order to improve the quality of printed products, AM screening, frequency modulation (FM) screening and hybrid screening techniques are often used.

The screens of the amplitude modulation and screening are arranged regularly, and the size of the printing ink is changed depending on the size of the dots. While the size of the dots of the FM screening is fixed, the distance between the dots can be changed, and the printing distance can be adjusted by changing the distance of the dots and the number of the dots. The amount of ink on the paper to achieve the color change. AM screening has three elements: screen number, dot shape, and screening angle. FM screening has only one element of dot size. The smaller the dot, the finer the print, the better the visual effect, which is equivalent to the number of high-adding lines when the amplitude modulation is added. However, the smaller the dot of the frequency modulation and screening, the higher the requirement for printing conditions. Hybrid screening is a hybrid screening technology that combines amplitude modulation and frequency modulation screening technologies and is formed on the same image. In homogeneous tone zone cities, especially in highlight zones, conventional screens produce a smoother appearance than FM screens. But for high detail, FM screening is better. Advanced screening software can analyze the image to determine where to use the appropriate screening geometry, and then combine FM screening with conventional screening to achieve the best overall results.

Using FM screening technology, you can eliminate moire, improve the level of reproduction uniformity, improve the resolution and clarity of the image, easy to achieve high-fidelity printing (Hi-Fi). Although FM screening imposes stringent requirements on printing conditions, water-based printing processes are suitable. High-definition FM network can significantly improve the clarity and level of print performance. The arrangement of FM network points is not limited by the amplitude and arrangement angles of the networks, as is the case for AM sites. Selecting FM network points in printing and copying can express more detailed changes, improve the clarity, and have anti-counterfeiting features.

(4) Printing color management technology

The CP2000 integrated offset printing press center control system developed by Heidelberg has adopted TFT ultra-thin screen display technology, and is equipped with prepress interface technology, image control technology, printing color management system, online help system and information management system, etc. Quality control mode under integrated conditions. Multi-level printing color management system PCM, including consulting, standardization, prepress and printing optimization, generation and implementation of Icc color profile and other content. In order to optimize the color flow and improve the printing plant's production efficiency, it effectively coordinates prepress and printing equipment. Not only can you get high fidelity, you can save time, reduce waste, and get productive production.

(5) Waterless Printing Technology

Waterless offset printing is a lithographic offset printing method that uses special silicone rubber-coated printing plates and inks, and does not require isopropyl alcohol or other chemical fountain solutions that are necessary in conventional lithographic offset printing. The printing process is easy to operate, and the ink is transferred to the printing plate within a certain temperature range without adjusting the ink-water balance relationship.

The plate used for waterless offset printing is a gravure plate, and the graphic part is lower than the surface of the plate. Although the plate making process is the same as the PS plate, it is different from the PS plate. Therefore, waterless offset printing plates have unique processing difficulties. Plate material, ink and temperature control are the key to waterless offset printing technology and directly affect the development speed of waterless offset printing. Plates are the core of waterless offset printing. Waterless offset printing plates have the advantages of easy operation, good image quality, high printing density, brilliant colors, and good quality of printed materials. However, the printing plate's resistance to printing force is easily manipulated. Conditions and the effect of special prints. The special inks used in waterless offset printing are characterized by low viscosity, high viscosity, high thixotropy, and stable performance. Because different colors of ink respond differently to temperature changes, it is necessary to control the temperature of different printing color groups. Although the cost of consumables for waterless offset printing itself is high, the rejection rate of printed products is low and the production efficiency is high. It can be seen that with the advancement of technology and the increase of labor productivity costs, waterless offset printing technology occupies certain advantages, especially for high-quality fine paper packaging, and will be further developed and promoted.

(to be continued)

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