In thermoset web offset printing, printing spots, printing density and gloss are the most important indicators of printability. For low-quantitative coated paper, gloss, smoothness and opacity are important printing Fitness index. Among them, opacity is the most important quality indicator of finished paper. Low opacity is the main reason for the through-printing or back-printing in the printing process, which will directly affect the printing effect; the increase in opacity is very important for the production of low-quantity coated paper. important.
Compared with offset paper, the printing effect of low-quantitative coated paper is much better, and its printability is between that of coated paper and offset paper. Due to the thin paper and the relatively small amount of ink on the surface, it is not advisable to have too many dark-tone overprint designs in the CMYK color version. In terms of inks, high-speed thermosetting inks are used for printing on commercial rotary presses, and special low-quantity coated paper quick-drying inks are used on flat four-color offset presses. At the same time, we should pay attention to adjust the feed of Feida to ensure the smooth transport of thin paper.
Printability of super calendered paper
Super calendered paper has high smoothness and gloss, especially smoothness even higher than coated paper. Although SCA is currently mainly used for gravure printing, in order to achieve the ideal gravure printing effect, it is necessary to control the smoothness and air permeability.
The continuous growth of the super-calendered paper market requires that it must meet the requirements of offset printing. When used to replace low-quantity coated paper, it must have certain surface properties to avoid the phenomenon of powder and fluff in offset printing. To meet these conditions, the choice of filler type and filler is very important. The filler type has a great influence on the absorbency of offset super calender paper. In addition, adjust the parameters of the fountain solution such as viscosity and surface tension during printing. Make it suitable for offset printing super calendered paper, can greatly reduce the failure of ink stacking.
Super calendered paper has a higher density, is thinner, softer and less stiff than other papers at the same amount, and the ink absorption during printing is also small. The number of screen lines for the output image should be 120 lines / inch. According to the performance characteristics of the printing press, the maximum TAC value should be selected between 24% and 26%.
At present, the printing suitability of super-calendered paper is no longer a problem. The production cost of super-calendered paper is about 15% lower than that of low-quantity coated paper, and the appearance is relatively similar. It has the advantages of low cost and good quality. In terms of environmental protection, all can be recycled. However, the target market for super-calendered paper has certain limitations. It cannot be used for high-end fashion prints, but for direct mail prints, super-calendered paper is quite ideal.
For each print, the choice of paper depends on its own value and needs, taking into account the economic and social benefits, I believe that the prospect of low-quantity coated paper and super-calendered paper is very broad and will attract more and more The more the eyes of the printer.
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