The difference between the application of gift paper boxes spot color printing and four-color printing

The difference between the application of gift paper boxes spot color printing and four-color printing

Gift Paper Boxes spot color printing refers to a printing process that uses other color inks than the four-color ink of yellow, magenta, cyan and black to reproduce the original color. In packaging printing, spot color printing is often used to print large-area background colors.

Questions about "Spot Color Printing"

1. What kind of products will use spot color printing

Gift Paper Boxes or book covers are often composed of uniform color blocks of different colors or regular gradient color blocks and text. These color blocks and text can be overprinted with four primary color inks after color separation, or can be mixed with spot colors. Ink, and then print only a certain spot color ink on the same color block. In the case of comprehensively considering improving the printing quality and saving the number of overprints, it is sometimes necessary to use spot color printing.

2. What is the difference in the visual effect of the color between the spot color printing color block and the four-color superimposed color block?

The ink prepared by spot color printing is obtained according to the principle of subtractive color mixing of color materials. , When the thickness of the ink layer on the layout is large, the change of the thickness of the ink layer will be less sensitive to color changes, so it is easier to obtain a uniform and thick printing effect.

The color block printed by the four-color printing process is mostly composed of a certain proportion of dots. When printing the dots, the thickness of the ink layer must be strictly controlled. It is easy to change the thickness of the ink layer and print Changes in process conditions cause changes in color intensity. Changes in the degree of network expansion. resulting in a color change. Moreover, because the change of any color that makes up the color block will lead to the change of the color of the color block, the chance of uneven ink color will be multiplied, so it is not easy to obtain the ink color of the color block printed by the four-color printing process. Uniform effect. If you cannot use a multi-color machine to overprint the color of the color block at one time. It is also easy to appear color cast because the color of the semi-finished product is not easy to control.

In addition, four-color printing obtains the combined effect of subtractive color absorption and additive color mixing of dots, and the color blocks have high brightness and low saturation. For light color blocks, the four-color printing process is used. Due to the low coverage of the ink on the paper, the ink color is dull and lacks a thick feeling. Due to the angle of the dots, it is inevitable that people will feel the existence of patterns.

3. From the perspective of improving product quality, what kind of products are suitable for spot color printing?

When printing a large area of light-colored uniform color blocks, it is usually used to add: medium light agent to the original ink to prepare the spot color ink, and then perform solid printing, so that the ink layer is thicker, and it is easier to obtain a uniform and thick color effect. If you use a four-color printing process, you must use low-count flat screen dots. However, the flat screen dots with low percentages are easily caused by tiny sand grains or slightly poor air extraction during printing, resulting in smaller dots in individual parts, resulting in uneven ink color: it is easy to water too much for the layout during printing. The accumulation of paper powder on the printing plate and the blanket, and the low smoothness of the paper cause the poor ink transfer of the small dots. This results in lightening of the ink color and uneven ink color.

For dark large-area color blocks, the four-color printing process may need to be superimposed by several colors of high-salt-number dots, and the ink layer is too thick, and the back is easily smudged; while the spot color printing process is used, only one print is required. Color, not easy to get dirty on the back. Using the four-color printing process, some parts of the graphics and text may be synthesized by several colors; while using the spot-color printing process, only one color is printed on the corresponding parts, avoiding the possibility of overprinting errors.

4. From the point of view of economic benefits, what kind of Gift Paper Boxes are suitable for printing with spot colors?

From the point of view of economic benefits, it mainly depends on whether the use of spot color printing process can save the number of overprints. Because reducing the number of overprints can save both printing costs and pre-press production costs.

5. Can one Gift Paper Boxes use four-color printing and spot-color printing at the same time?

If the picture of a certain product has both a color gradation picture and a large-area background color, the color gradation picture part can be printed in four colors, and the large-area background color can be printed with spot color. The advantage of this is that the four-color printing part can correctly restore the picture by controlling the solid density, and the background color part can obtain a uniform and thick visual effect of the ink color by appropriately increasing the ink volume. This method is often used in the printing production of high-end packaging products and stamps, but due to the increase in the number of colors, it also increases the cost of printing plates.