Analysis of the Quality of Metal Packaging Printing

Analysis of the Quality of Metal Packaging Printing

The quality of printed iron products comes from the understanding and pursuit of the quality management of the products and the quality of each printed iron product by the relevant management personnel at all levels. While providing the printed image of the printed iron product, the customer is required to faithfully restore the graphic color provided. Judging from the conventional requirements, people think that good quality iron products should be products with true color and complete color tone. Experiments have shown that people can only get a more impressive evaluation after comparing multiple pictures and texts. If you take out a printed iron product graphic separately, people's views are often inconsistent. In addition, under certain conditions, the quality standards of the graphic and text may be determined by the customer in consultation with the salesperson or technical person in charge of the printing company, and shall be included in the supply contract of both parties. Various levels of quality standards that do not meet the above quality standards are of no use value and can only be used as a reference for the above standards.

Judging from the quality requirements of conventional printing iron, the true color is the key to the quality of printed iron. The authenticity of color must first be good quality of the original. At present, the quality of domestic printed irons is uneven, and a considerable number of originals need to be re-made or modified before they can be used. Followed by the scanning skills of the graphic. Before scanning, the magnification of the graphic should be determined according to the actual size of the graphic. Too large and too small magnification will cause subtle levels of loss, and ultimately will affect the authenticity of the copied text. At the same time, the black and white field selection calibration when the image is scanned, the GAMM worthy of selection, the USM setting and the color adjustment will affect the reproduction of the seat level, which require special attention. Do not zoom in or out at any time during computer production, especially if you repeatedly repeat the magnification and tone adjustment registration. Finally, the correct resolution and number of network cables are selected when screening the film. The number of screen lines should be determined by the graphic requirements of the printed iron products. It is not possible to use the plate making method with a high number of network lines. Color is the place that customers care most and is the most difficult for Indian workers. People generally demand that color be authentic, but the color itself has a strong subjective consciousness, and everyone's preference for color is inconsistent. Therefore, in addition to the originals, the customers often provide PANTONE color numbers for the colors that need to be emphasized when the products are processed by the printing and iron enterprises, which is convenient for the color control of the printing staff. In actual operation, in order to ensure the color requirements of the customer's processed products, the printing irons are usually organized by the printing and ironing company to perform the proofing of the originals provided by the customers. Printing iron proofing is actually a simulated production of printed iron. Through proofing, it is necessary to determine the color number of the color separation, the color sequence of the printed iron construction, the number of screen-making wire lines and the angle of the wire, the selection of the printing ink, the selection of the metal sheet and the selection of the iron machine. After passing the ocean, the printed iron product includes the whole process of color production. Once the customer confirms, the production has relatively mature operation technology. After the proof of iron is completed, it is usually handed over to the customer for confirmation. If you are not satisfied, you should re-sample according to the modification suggestions made by the customer and submit it to the customer for confirmation. In the normal printing of iron, the printing iron workers are printed according to the sample confirmed by the customer. The operator must strictly follow the model signed by the customer for production, and must not change the color at will according to subjective wishes.

The complete tone of the printed iron graphics is actually the saturation and tone. First of all, we must ensure that the graphics and color levels are complete. A full-tone image with a histogram that starts at the same level as a hillside and falls from the start to the end in a straight circle. If there is a vertical steep slope at both ends of the rectangular circle, the highlight or dark tone in the hierarchy is intercepted, and the highlight or shadow level has been lost. If there is still a distance between the two ends of the image or one end from the starting point of the histogram, the image hierarchy has been compressed. The key to ensuring a complete tone is the original. The original will directly affect the image quality during the process of shooting, rinsing, scanning and production. Under the premise of ensuring the quality, under the condition that the color tone level is complete, then the level of compression problem should be considered. The level of the graphic should be compressed within a certain range. This is because the graphic and text in the construction of the printing iron is subject to restrictions on the printing iron machine, PS plate, metal sheet, ink and other conditions and the printing process. Take the iron machine, the equipment conditions of the various Indian iron companies are different. The overall classification is divided into two categories, namely imported iron printing machine and domestic printing iron machine. The imported iron machine is represented by the United Kingdom and Japan, and has a multi-color iron printing machine. The material of the equipment, the viscosity of the overprint and the linear speed consistency of the three rollers after the color lining are at the domestic leading level. The domestic iron printing machine is slightly inferior to the above three major indicators. Therefore, considering the angle of the printing iron equipment alone, the amount of compression at the graphic level will be discussed by machine. From the perspective of the advanced and backwardness of the plate making method, the amount of compression is large, and the amount of compression is relatively small. In addition, the quality of the ink will also affect the level of compression requirements. At present, there is a certain gap in the quality of domestic inks. Relatively speaking, the quality of inks in Shanghai, Tianjin and Guangzhou is slightly better, mainly in the good printing performance, fine pigment particles, good tinting strength and pure color, while some printing inks still have a certain gap in physical and chemical properties. Therefore, the factors affecting the printing ink should also be considered in the layer compression. In particular, high-gloss spots can not be printed, which is directly related to the accuracy of the iron machine, the difference between the plate making methods, and the size of the ink pigment particles. And because of the printing of iron, when the plate is printed, the outlets are enlarged, resulting in a large area of ​​ideas and paste into the ground. The smallest idea that can be printed and the big idea that will happen and paste is the range of the tint output of the printed iron. Therefore, the tonal range must be adjusted. In fact, in the scanning, the black and white field calibration is to limit the color to a certain range of tones, that is, to compress the layer. The quality requirements of conventional printing iron are basically high-gloss, and the dark tone is not ambiguous. The high-gloss network is to ensure that the small ideas are in the brightest place in the picture. In actual production, the expansion of the ink area of ​​small dots is far greater than that of large outlets. The small outlets in the province of India are either lost in the printing iron or spread to 6%-8%. If the highlights are set to the absolute network, the next level will immediately jump to 6%-8%. Obviously, the net will be a stand-up white spot. In addition, the contrast between the middle and the dark, and the high-middle tone are the key points that our iron-printers must consider. In summary, the true and reliable color and the layered tones are two important indicators for measuring the quality of graphic images. In the production of printed iron, in order to ensure the quality of graphic and graphic reproduction, we must first understand the specific requirements of graphic quality. Secondly, it is necessary to know the relevant factors affecting the quality of graphic reproduction to prevent the occurrence of quality deviation from the root. The third is that the tone control of the graphic must be determined according to the actual production data specification.

Printed iron quality control is a complete system engineering, and the dataization and standardization of printed iron production is the foundation of this system at any time. The full modern printing iron management system is the fundamental way to solve the fluctuation of the quality of printed iron.