A Brief Analysis of Some Technical Problems in FM Screening Technology

At present, FM screening technology has some technical problems in the aspects of technology, equipment, and materials.

1. The problem of network expansion. Dot enlargement refers to the phenomenon of halftone dot diffusion when printing with ink. The image using the FM dot network will have a particularly large dot gain, which is 25% to 35% when printing on coated paper, and up to 50% when printing on non-coated paper, which seriously affects the reproduction of the image.

2. Quality control is difficult. Due to the existence of dot expansion problems, the printed image will be dark, and the middle tone will be shifted to the dark tone. In the printing process, the performance of the mid tone and dark tone is not easy to grasp.

3. There are high requirements for the material and machine of the posterior sequence such as printing and printing. At present, domestically produced materials and processes are difficult to meet the requirements of FM radio outlets for printing suitability. At present, high-end color printing is commonly used for 175LPI or 200LPI AM outlets. The outlet range is generally between 2% and 98%. In a sense, this is now There are limit values ​​that materials (print plates, blankets, ink, paper, etc.) can reach in traditional processes. The image of the FM network is formed by aggregating 2% or less of the 200LPI AMs. Therefore, it is difficult to use the existing materials and processes to reproduce the FM.



Source: "Guangdong Printing" No.4, 2004