Introduction to flexographic printing industry of

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Folding carton flexographic printing industry introduction (printing)

II, printing

1) water based ink, UV ink and glazing

the choice between them generally refers to the use of water-based ink or UV ink (or both) for carton printing. Each ink has its own advantages and disadvantages, which should be considered comprehensively, and market factors will play a decisive role. What the two systems have in common is that they both reflect the consistency of color and the quality of color restoration. The adjustment of the stripper roller and the doctor blade by the printer has little effect on the color. The correct color and the choice of the embossing roller are related to the nature of the ink, but have little to do with the operator adjusting the amount of ink by screwing the adjusting knob. Because the printer can call out the color of material performance on one equipment, and another printer can also call out the color on another machine

but for developers in most cities across the country, 2) aspects that should be grasped when copying prints

if the same color mode is used on the same roller all the time, the copied colors are also the same. In today's flexographic printing, glazing and film covering processes can also be added to the folding carton printing process, which can increase more added value and reduce costs. UV, water-based and EB glazing oils and adhesives are widely used. When choosing the ink system, the choice of UV, water-based and EB varnish and glue must be based on the actual situation

3) consideration of film base

the type of film base will have a great impact on the printing quality of cartons. For example, compared with rough surfaces, smooth surfaces will get less point loss and better color restoration. The brightness of the carton surface will affect the overall appearance of the carton. A dark and matt surface will affect the color of the printed ink. Making modifications and corrections before plate making can reduce the impact of this situation, and sometimes completely eliminate the impact. Every printer hopes to always use the highest quality film base, but from the economic point of view, we should choose the most appropriate film base

4) comprehensively use ink, embossing roller and printing plate to obtain the results you want.

in any flexographic printing, only the comprehensive use of equipment, ink, embossing roller, sheet base, plate and glazing oil/glue can make the folding carton printing obtain the highest quality. All these improvements can make flexo printing comparable to offset printing. Although not all offset prints can be imitated by flexographic printing, most of them are OK. With the progress of technology, the gap between the two is getting smaller and smaller. For example, when the high-strength inks are used together with the high-speed roller of high-speed wire, and then the digital printing plate is used, very clear and bright dots can be printed

as we all know, when deciding to explain the composition and how to carry out document highlight black effect for color reproduction, which refers to the treatment of dark and bright appearance, rubber roller test and instrument test are the best starting points. This is particularly important for the folding carton market, because the selection range of film base is relatively wide. You must have rich experience and knowledge and know how each film base affects color reproduction in order to choose a good one. When the basic work is finished, it is time to choose the corrugation roller, ink, liner and plate suitable for the sheet base, as well as the appropriate curvature of the sheet base. After testing, all requirements are met, the program will be simplified and waste will be reduced, and the printing quality will be greatly improved

achieving offset printing quality does not mean that flexo printing can also be printed like offset printing. For example, there are great differences between them in color number, ink color sequence and prepress technology. This information sometimes has to be known to end customers who are used to offset printing. Customers are more concerned about the printing effect, but have little interest in the printing method. This is sometimes a challenge for flexographers, but it is very important to convey the message to customers, so that customers do not try to apply the requirements of offset printing completely to flexographic printing

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