There are many noteworthy details in the pre-press design process of flexible packaging. Here, yltpackaging will focus on the following points for attention. 1. Small characters and lines (1) Small characters and lines should be designed in one color to avoid inaccurate multi-color overprinting. (2) The width of the thin line should not be less than 0.1mm, otherwise it will be easily lost or unclear in printing. (3) The net height of Chinese fonts is not less than 1.8mm, and the net height of English fonts is not less than 1.5mm. (4) Special attention should be paid to the design of reverse white text. If the text is small, especially when the strokes are thin, monochrome should be used. Attention should also be paid to the choice of fonts. Round-headed body, black body, and isolinear typeface are better choices, while fonts with large stroke differences such as Song typeface and old Song typeface (horizontal thin and vertical thickness) should be used with caution. If this type of font is used, it should be noted that the net height of the Chinese font is not less than 2.5mm, and the net height of the English font is not less than 2mm. 2. Transition screen (1) If you want to print reverse white text on the transition screen, the transition screen should be designed as a spot color to avoid misregistration. (2) When the dot area ratio of the transitional network is less than 30%, use reverse white characters with caution. (3) For the transition net designed with certain colors (such as black, dark green, dark purple, etc.), when the dot area ratio reaches 70% to 85%, it is difficult to obtain a smooth and bright transition effect, and serious problems often occur. Water streaked spots. 3. Large-area color blocks (1) When screening large-area color blocks, the range of 70% to 85% should be avoided, otherwise irregular dirty spots will appear. (2) When the dot area ratio is below 10%, it is easy to cause dot loss during the printing process. (3) If you want to print reverse text and lines on a large area of color blocks, be careful not to use colors with high brightness, such as light yellow, light orange, etc., otherwise the text and lines are not easy to read. 4. Seamless connection design of continuous patterns In the design process, sometimes the problem of pattern continuity is encountered. When dealing with such problems, many people either use partial transparency effects (that is, no patterns are printed on the film) to make up for the lack of cutting. standard, or use the same color block on the edge of the bag. In fact, it is not bad to do so, but sometimes it will destroy the continuity of the pattern and lack aesthetic feeling. The design and production of continuous patterns should take into account the size, shape, continuity and other factors of the pattern. Only when the pattern is selected appropriately can better results be obtained. The seamless connection between patterns is guaranteed during imposition, and the continuity of the overall pattern will not be affected when cutting. 5. The use of transparent ink The hiding power of transparent ink is very low, and the transparency is extremely high. Films printed with transparent inks are generally compounded with aluminized film, so that the metallic luster of the aluminized film and the luster of the ink are combined to reflect brighter colors, and when viewed from different angles, the hue will change significantly. Observed under different light sources, the difference will be greater, which has a good shelf display effect. 6. The problem of increasing the size of the front pattern In many design cases, the problem of increasing the size of the front pattern is involved. The pattern is enlarged towards the back to avoid the back pattern appearing on the front of the packaging bag when there is a deviation in the bag making process, which will affect the integrity of the main view (front) pattern. 7. Arrangement of color sequence If the gravure printing process is used, the color sequence should be from dark to light, and the color sequence of surface printing is just the opposite. In the case of spot colors, the color sequence of the spot colors should be determined according to the brightness of the spot colors, so as to improve the overprinting accuracy of the overall pattern.