Indentation and bleeding in printing applications
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People often say that the seven-point system, three-point printing, clever use of some techniques in the plate making process can often play a finishing touch. Therefore, if you want to be an excellent design and plate-making person, you must be very familiar with the whole process of printing, in order to produce a printing plate that meets the requirements of various original copying, and finally achieve the faithfulness of printing on the original copy.
Whether it is offset, flexo, gravure, or screen printing, rich colors can't be achieved with a single color. Many colors have to pass two or more colors to restore the color of the original.
The author below from the specific case, talk about the application of indentation and bleeding during the plate making process, for peer reference.
First, indentation technology
Indentation technology refers to the overlay of two or more colors. In the process of making plates, according to the actual situation, some of the pictures are superimposed on the original size according to the color separation order, so that the printing plate is slightly indented on the basis of the original size. The overprinting is accurate when printing, making the text more realistic. For example, the “China Environmental Protection” mark on various packaging materials on the market is made up of cyan, yellow and gold. In actual printing, many printed products are difficult to deliver to the user when the green yellow is superimposed into green, which causes great loss due to inaccurate overprinting. Some people think that spot color green can be used to solve this problem. But whether to increase the color of the spot color has to consider whether the company's own printing equipment has enough color groups to achieve this process. How to solve the problem of each color group of four-color, six-color, eight-color or even ten-color printing presses? In addition, there are at least two drawbacks for each additional color: one is the increase in cost; the other is to increase the difficulty of printing operations.
The author believes that for this situation, the application of indentation technology in the plate making process is a good method. At the time of plate making, the yellow or green version is indented, and the problem of inaccurate overprinting is easily solved.
In addition, the text on many packages is currently overprinted in multiple colors. According to common sense, text color separation is not recommended. According to the data, the image overprinting error in color printing is below 0.3mm, which is not obvious to the human eye. When the text overprinting error is about 0.1mm, the human eye is easy to detect. However, in some occasions, in order to highlight the artistic effect of the text, it is necessary to use the color separation overprinting, and the indentation technique can be used in the plate making to reduce the printing difficulty.
Second, bleeding technology
Bleeding technology refers to the stability of the original design size in the post-press processing. In the color separation plate making, according to the actual situation, some color plates are extended outward by a certain proportion in the original design size. Modern packaging is not just a single printing, but also goes through many processes from printing to finished products, such as: compounding and bag making in flexible packaging, glazing, laminating and die cutting in paper packaging. These processes can cause large errors between the design size and the actual size. Therefore, it is necessary to apply the bleeding technique reasonably according to different designs. For example, the main color of many flexible packagings is full version, in order to ensure the stability of the basic size in the compounding, slitting and bag making process, the main color version of the electro-engraving is expanded by 1.5~3mm, so as to ensure that the finished product meets the requirements. .
There are many technologies in the plate making process, such as trapping, incrementing, etc. If it can be applied flexibly, it will be easier to realize the faithful reproduction of the original and make the customers more satisfied.