윤전 오프셋인쇄에서 인쇄뒤비침에 영향을 미치는 인쇄조건에 관한 연구

Abstract

Print-through is one of the important problems in offset printing and affected by some components such as opacity of paper, penetration of pigment and oil vehicle from ink. In this study, five kinds of domestic uncoated paper and one coated paper were tested by PM-902PT printability tester, and Print-through was measured by 3 methods using Densitometer, Elepho and Image Analysis Program. Also, three kinds of inks and some kinds of different printing conditions such as the changes of drying condistion, amount of ink-feed and emusification rates were compared. At the results of different ink feed, Print-through using Image Analysis Program is the most reliable on both uncoated and coated papers. And at the results of experiment for five uncoated paper, control of opacity, brightness and roughness of paper is very important to improve print-through but control of formation and porosity is not. Also inks made several companys respectively have an different effect on Print-through on same paper. And changes of ink affected Print-through when happened in drying and emusification processes.