Research On The Quality-Controlling Method Of FM Screening Product Based On The CTP Workflow

In recent years, CTP equipment is accepted by many printing company, this add for FM screening the new opportunity. So we have the necessary to research the method of controlling the characteristics of the printed sheets by FM in the new digitized printing process. And hope that the research can help to develop the using of FM screening.This article establishes the major quality control parameters in CTP FM screening, analyzes the characteristics of the printed sheets by FM, and finally proposes the method to establish a mathematical model to evaluate the print quality in a fuzzy comprehensive way. Firstly, CTP will be used to process the independently-designed proofs and get the plates, further to get the final printed sheet through machine proofing. Secondly, researches are done here to establish solid densiy, relative contrast, grey balance, dot gain, double print percentage and some other factors as the major quality control parameters and relative analyses are conducted thereafter. Finally, based on the results gained beforehand, and the recommended standard in our print industry as well, weights are then determined using AHP, and the major control parameters affecting the print quality are selected as evaluation factors, thus the fuzzy comprehensive evaluation of the printed sheets is conducted and the measurable assessment of the print quality is realized. The conclusion that the proof belongs to common prints is gotten.Topic objective is that FM screening control methods which are proposed and technological features which are aggregated could become the reference which is applied in practice, and the method by which print quality fuzzy comprehensive evaluation's mathematical model is established could provide a new thinking for the comprehensive evaluation of print quality.