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Newspaper Printing Reflections On The Control Measures Of Newspaper Printing Quality
- May 29, 2018 -

The printing quality of newspapers is getting more and more attention nowadays, especially for high-end advertising clients. However, to print a high-quality color newspaper, it is necessary to achieve effective control of graphic overprinting, ink transfer, and hierarchical adjustment according to the conditions of paper, printing methods, and printing media, in order to achieve the printing of color newspapers at overprinting levels. Quality control measures such as color reproduction, ink uniformity, etc.

Ink balance control

The ink balance control is a key factor influencing the printing quality. If the control is good, then the printed color newspaper is colorful, the gloss is good, the title is dark, the text is delicate, and the levels are obvious. The quality can be printed with the minimum amount of water and ink. In contrast, if water and ink are increased indefinitely in the printing process, large areas of ink will be emulsified, newspapers will be damp and sticky, headings will be gray, photos will be dark, and the appearance will be ugly. To properly control the ink balance in actual production, the following points need to be noted.

1. To correctly understand the relationship between water volume, ink volume and printing

In color newspaper printing, the ink is mainly osmotic and dry on newsprint. Therefore, to achieve moderate ink and clean layout, more water and ink are required than for coated copperplate paper. However, the absorptive capacity of newsprint is limited. Excess ink will cause dots to increase under the influence of printing pressure, which will make dark dots even and even paste, which will seriously affect the printing quality. In multicolor printing, the overprinting of the ink will also make the color dark and dull.

Due to the effect of the dampening solution, the unabsorbed ink is emulsified, causing the ink to fall off and dragging the dirt. Part of the buoyant fluid flows back into the water bucket and contaminates the fountain solution in the water tank. After a long time, flocculation will occur in the water tank. The ink particles in the shape cause the water supply system to be blocked and the screen fogging dirty. The excess amount of water will also wet the paper, causing the paper to distort, causing paper to stop at high speeds. Too much ink will also cause “flying ink”. Therefore, the balance of water and ink at high water levels is not desirable.

When the amount of water is too small, ink will first appear in the blank part of the print, causing a dirty plate. With the prolongation of printing time, the ink will gradually block the non-inked parts and appear “stencil”. The shallow pattern on the dot area above the ground will be blocked by the ink. General requirements, on the premise of not causing the layout to be dirty, using the minimum amount of water, to achieve the balance of water and ink. The use of the minimum amount of ink to achieve the specified density range during the operation is the most effective use of the ink, especially for newsprint printing. The amount of water and the amount of ink are controlled below the normal saturation value and reach an equilibrium state, so that the best printing effect can be achieved. .

2. To master the principle of less ink thickness

Less water is based on the premise that the blank part of the layout is not sticky; ink thick refers to the increase in the amount of ink that is built on the basis of less water. When considering the amount of water, it is also necessary to comprehensively consider the size and distribution of the layout of the layout, the thickness of the ink layer, the properties of the printing paper, the performance of the ink, the type of printing plate, the operating speed of the printing press, the temperature and humidity of the workshop, and the pH of the fountain solution. The value and the auxiliary agent added in the ink, any one of these conditions will affect the final effect.

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