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1. Characteristics of European ink:
1. European ink pigment particles are fine (less than 5μm), less impurities, high transparency of the four primary colors (K, M, C, Y), dot image printing effect is vivid and detailed, rich in layers, solid color block printing effect is bright and bright, Smooth, good color fastness.
2. European ink has good ink removal and transferability, no ink accumulation, short water and ink balance time, low water supply, less ink, suitable for high-speed machine printing, stable color.
3. There is no skin on the machine for a long time, which has good effect on inhibiting paper depilation and powder removal, and has wide paper adaptability. During the printing process, the number of downtime cleanings is reduced, saving time, labor, and paper, and printing is smooth.
4. Using high-quality raw materials and advanced ink production technology, the quality is stable. Strictly abide by the safety and environmental protection standards of European and American related industries, and the European plant-based environmental protection formula is safe and secure.
Second, the use of European ink:
1. It can take 2 to 5 minutes to check the proportion of water tank wetting fluid and the change of water quality during the shift. The general wetting fluid preparation standard is: alcohol concentration is 8 to 15%, pH value is about 5.0 to 5.5, and conductivity is between 800 to 1300? S / cm. The water tank with a cooling circulation system should be opened, the temperature of the wetting liquid should be controlled at about 8-12 ° C, and the wetting liquid should be cleaned and replaced regularly. Before printing, appropriate adjustments can be made according to the difference between the printed image, text, ink layer, plate, paper, etc., to ensure the quality, safety and efficiency of printing production.
2. Due to the good transferability of ink in Europe and the rapid balance of water and ink, it is not appropriate to open the water volume and ink volume during color calibration. From shallow to deep, first refer to the restoration of the dot image, and then refer to the saturation density of the solid color block. Balance to achieve clear and smooth layout levels. In addition, as long as the printing surface is not dirty, the minimum water supply and ink supply can quickly reach the water-ink balance.
3. Adjust the appropriate printing pressure according to the paper thickness. The pressure is based on the premise that the printed product has strong dots, clear graphics, bright colors and shades, and the smaller the application, the better.
4. The temperature of the printing workshop is controlled at 15-25 ° C, and the relative humidity is controlled at about 40-50%, which is beneficial to the accuracy of overprinting and the stability of printing.
5. If the paper is damp, the graphic ink layer is thick, or the printing speed of the special paper affects the drying speed, the appropriate powder spraying and powder spraying amount should be selected, and the printed products should not be stacked too high, such as particularly slow drying paper can be added Appropriate amount (2% ～ 3%) of active oxidizing desiccant enhances quick-drying speed.
3. Matters needing attention in the use of European ink:
After European inks enter the domestic market, most of the ink hues are close to those of Asian inks (Japan Toyo, DIC, etc.), but the biggest difference between the two is ink properties. European ink pigment particles are fine, high purity, good fluidity, and high color transparency, so the printed dot image is vivid and detailed, with a strong sense of layering, and the four-color printing on the ground tends to be bright and bright. However, domestic inks generally have coarse particles, many impurities, poor fluidity, and are easy to accumulate ink. Therefore, the color brightness is low and the hiding power is strong. The printed dots are not smooth, small dots are easy to lose, and the sense of hierarchy is not strong. The printing color is deep and thick. Due to the difference in ink properties between the two, there will be a certain difference if the European ink is used to print the original domestic ink, especially the color effect of the four-color field printing, which must be communicated to the customer.
In order to achieve the same depth as the sample, some printing masters usually thicken the ink layer to achieve the saturation of the solid color block. In fact, this is not the best method, because the effect of this printing will cause the dots to deepen and the level is not clear, which affects the printing effect of the entire layout, and it is also prone to large ink, large colors, unstable colors, and poor drying.
In response to the above, we will make the following recommendations:
1. In-depth communication with customers, let customers know the effect of the two inks, and let customers choose a good plan.
2. If the printing density of the manuscript exceeds the standard printing density (Y: 1.10, M: 1.40, C: 1.40, B: 1.80), it is recommended that customers use four-color field printing instead of spot colors or inks with higher color density to obtain Lively dot image and saturated and bright field effect.
3. If there are four-color printing on the ground and shallow screen, the output of the dot can be adjusted slightly through pre-press file processing or printing process.
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