Analysis of Metal Packaging Printing Quality

From the standpoint of the quality of the conventional printing iron, the credible color is the key to the quality of the printed iron and iron graphic. The authenticity of color must first be of good quality. At present, the quality of domestic originals of ingots is uneven, and a considerable number of originals need to be re-produced or modified before they can be used. Followed by the graphic scanning skills. Prior to scanning, the magnification of the graphic text is determined based on the actual size of the graphic text. Too large and too small a magnification can cause subtle levels of loss, and in the end it will affect the authenticity of copying images. At the same time, when the black and white fields are selected and calibrated during the graphic scanning, the selection of the GAMM, the setting of the USM, and the color adjustment will all affect the reproduction of the seat level. These require special attention. Do not arbitrarily enlarge or reduce graphics during computer production. In particular, repeat the magnification and tone adjustment registers several times. Finally, the correct resolution and screen number are used when the screen is printed. The number of screen lines should be determined by the graphic requirements of the printed iron products. The plate-making methods with high screen lines cannot be used uniformly. Color is the place where customers are most concerned and are the most difficult for Yintie workers. People generally demand that the colors are authentic and credible, but the colors themselves are highly subjective, and each person's preference for color is inconsistent. Therefore, in addition to providing originals, customers in printing companies often provide PANTONE color numbers for colors that need to be emphasized, which facilitates color control of printing staff. In actual operation, in order to ensure the color requirements of the customer's processed products, it is usual for the printing company to organize iron- proofing of the manuscript provided by the customer. Printing iron proofing is actually a simulated production of printed iron. Through proofing, it is necessary to determine the color number of color separation, the color sequence of the printing iron construction, the number of line and screen lines of the plate-making network, the selection of the printing ink, the selection of the metal sheet, and the selection of the printing machine. After passing through the ocean, the printing iron product includes the entire process of color production. Once the customer confirms, the production has a more mature operating process. After printing and iron proofing is completed, it is usually given to the customer for confirmation. If you are not satisfied, you will need to re-proof the sample based on the customer's amendments and submit it to the customer again. In normal iron-plating construction, Yintie workers print according to samples confirmed by customers. Operators must strictly follow the model signed by the customer for production, and must not change their colors at will by subjective wishes.

The complete shade of Yintie graphic is actually saturation and tone. First of all, we must ensure that the graphics and graphics levels are complete. In a well-toned image, the histogram's start should have a certain slope, like the hillside, and fall within the radius from the start point to the end point. If vertical steep slopes appear at both ends of the square, the highlight or dark tone in the hierarchy is intercepted, and the highlight or shadow level has been lost. If the two ends of the image or one end of the image has a distance from the starting point of the square circle, it means that the image level has been compressed. The key to ensuring a complete hue is the original manuscript. Manuscripts will directly affect the quality of images and texts in the entire process of shooting, processing, scanning and production. Under the premise of guaranteeing quality, under the condition that the printed tonal layers are complete, the level of compression should be considered. The level of graphics and text should be compressed within a certain range. This is because the printing and textu- ture is subject to restrictions such as the printing machine, PS plate, metal sheet, ink, and the iron printing process. Take Yintieji for example, the equipment conditions of each printing company in China are different. The overall is divided into two categories, namely imported iron printing machine and domestic iron printing machine. The imported iron printing machine is represented by the United Kingdom and Japan, and a number of two-color printing machines. The material of the equipment, the viscosity of the overprint and the consistency of the linear speed after the three cylinders pass the color lining are at the leading level in the country. The domestic iron-making machine was slightly inferior to the two above-mentioned three indicators. Therefore, from the standpoint of the Yintie equipment alone, the amount of compression at the graphic and textual level will need to be resolved. From the point of view of the advancement and backwardness of plate making methods, the amount of poor compression is large and the amount of good compression is relatively small. In addition, the quality of the ink will also affect the level of compression requirements. At present, domestic ink quality also has a certain gap. Relatively speaking, the quality of Shanghai, Tianjin, and Guangzhou inks is a little better, mainly due to the excellent color printing performance, fine pigment particles, good coloring power, and relatively pure colors, while some iron inks still have a certain gap in physical and chemical properties. Therefore, the factors affecting the printing ink should also be taken into consideration when compressing the layers. In particular, high-light dots cannot be printed, which is directly related to the accuracy of the printing machine, the difference in the method of plate making, and the size of the ink pigment particles. And because of the printing of iron and printing, the dot expansion, resulting in a large area of ​​ideas and paste into the ground. The smallest point that can be printed and the big idea that will happen is the scope of the print output of the Yintie graphic. Therefore, the tone range must be adjusted. In fact, in the scanning, the calibration of black and white fields is to limit the hue within a certain range of tones, that is, to make level compression. The quality of the conventional printing iron is basically that the highlights never stop netting and the dark tone does not mix. High light is not the end of the network is in the brightest part of the graphic and also to ensure that the small point out. In actual production, the expansion of the ink area of ​​small outlets is much larger than that of large outlets. The small outlets of the Ministry of Printing and Industry are either lost in the Indian Railways or expanded to 6%-8%. If the highlight is set as a net-free, then the next level will immediately jump to 6%-8%. Obviously, the absolutely nowhere will be a striking white spot. In addition, the level of contrast between the dark tone and the high school tone is an important part that our Indian Railway workers must consider. In summary, the true and credible colors and the tonality of the colors are all two important indicators for measuring the quality of graphic and graphic documents. In order to ensure the reproduction quality of graphic and graphic arts, it is necessary to first truly understand the specific requirements for graphic and graphic trademark quality. Secondly, it is necessary to know the relevant factors that affect the quality of graphic reproduction to prevent the generation of quality deviation from the root. The third is to determine the tone control of the text according to the actual production data specification.

The quality control of the printed iron is a complete system engineering, and the dataization and standardization of the Indian iron production are the basis of this system at any time. The modernized printing rail management system is the fundamental way to solve the quality fluctuations of the printing iron.