In the application of sublimation inkjet printing , high-quality printing output is the goal we have been pursuing. How to improve the precision of inkjet printing has become the focus of many friends. This article will talk about the principle of inkjet color development. And the method of improving printing accuracy.
Sublimation inkjet printing presents colors in a way similar to paint. They are mixed with cyan, magenta and yellow colorants to form an image, which is called subtraction.
Unlike painting, inkjet technology cannot mix ink and then paint on paper. Instead, it uses many small solid color dots to make people look like full-color images. If you use a high-power magnifying glass to observe the inkjet output image, you can see that each color of ink forms dots on the paper. This imaging principle is very similar to printing. It is called halftone image, that is, the ink only presents a single color, and uses different ink dot sizes and distribution frequencies to form a full-color image.
Methods to improve printing accuracy:
1. Reduce the ink dot size and increase the number of ink dots per unit area
From the development of inkjet printhead, you will find that the printhead itself is developed according to this trend. The core parameter of the print head that we often pay attention to is the minimum skin lift size of the ink dot. The resolution is directly related to the printing fineness.
2. Add light ink of the same color
As we mentioned earlier, since ink dots can only present a single color, in order to represent colors with low density, the number of ink dots must be reduced to leave blank areas, which will certainly lead to the decline of image quality. Therefore, another way to improve the printing precision is to add light color inks of the same color. This makes it possible to use light ink with more ink dots instead of thick ink when low concentration output is required. This can avoid the original low concentration ink. The ink dot will reduce the resolution and fineness.
3. Match and combine spot color scheme
As mentioned above, in order to represent full-color, ink dots of different sizes and numbers must be mixed. For example, magenta and yellow can form red and orange. However, the chromaticity of subtractive color mixing of three primary colors is not as bright as that of direct use of color ink, so complementary ink has been added to inkjet applications. At present, the common complementary ink configuration is red / Green / blue or orange / Green / purple. This is what we often call spot color ink.