Photo album printing products can attract people's attention, and their production technology is closely related to the production level. We usually see that the production level and product quality of album printing products are different, only some good quality of picture printing products will attract everyone's attention. In this process, graphic printing, color label printing and ink scraping technology are very important. Its quality plays a very important role in the printing effect of pictures. Printed products. To this end, we are inviting senior printing engineers in the printing industry to introduce the printing and scraping technology in color printing.
1. One of the basic requirements to achieve perfect image reproduction is the quality of transparent positive and negative, that is, the edges of dots should be neat and opaque. Separation ink and printing ink using the same color label.
2. Place the positive plate on the glass plate and expose it. The stretched sieve plate is placed on the positive plate, parallel to the image axis. If there is moire, the screen can be rotated to the left or right until the moire disappears. Generally, it can rotate 7 degrees and be printed in Zhengzhou. The area prone to moire is located at the intersection of mesh direction and mesh direction. Main tones and dark colors can cause moire problems.
3. For four-color printing, Xi'an printing should adopt the same size and stability of the aluminium mesh, Zhengzhou non-woven bag design and production, the same type of mesh and model of screen, Zhengzhou picture album printing. The use of dyed screen plate can help eliminate moire, make the tension of screen plate uniform, and make the tension of four-color printing screen uniform.
4. A good floor scraper is essential for high-quality printing. The Shore hardness of the blade is about 70. The scraper should be set at 75 degree angle. If the scraper angle is too flat, the printed image may not be clear. If the angle is too steep, the risk of screen printing image distortion is high.
5. Return knife should not be too low, if too low, film plate will be full of excessive ink, Zion non-woven bag production, printing easily burnt and rubbing dirty.
6. Screen image printing with high viscosity ink, the thinner the screen needs more color ink.
7. 使用UV油墨时，网版正片色彩范围应选择为5% ~ 80%，刮胶的肖氏硬度应为75。为了控制UV油墨在套色时不蹭脏，建议按蓝色、品红、黄色、黑色等颜色顺序进行印刷。在使用UV油墨时，丝网厚度不超过5um。
7. When using UV ink, the color range of screen positive should be 5%-80%, and the Schottky hardness of scraper should be 75%. In order to control the dirty color of UV ink, it is suggested to print in the order of blue, magenta, yellow and black. When using UV ink, the screen thickness is not more than 5um.