Effective Waste Control Techniques Used in Newspaper Printing

Pages:254-256
Arohit Goyat and Kuldeep Soni (Department of Printing Technology, GJUS&T, Hisar)

Web offset printing is a form of offset printing in which a continuous roll of paper is fed through the printing press. Pages are separated and cut to size after they have been printed. Web offset printing is used for high-volume publications such as mass-market books, magazines, newspapers, catalogs and brochures. There are two methods of web offset printing, known as heat set and coldset. In the heat set process, the ink is dried rapidly by forced-air heating. In the cold set process, the ink dries more slowly by ordinary evaporation and absorption. Some web offset presses transfer text and images to only one side of the print medium at a time. Others can print on both sides simultaneously. The paper width is usually between 11 and 56 inches. The paper is fed through the system at speeds ranging from 5 to 50 feet per second. Web offset printing differs from sheet-fed offset printing, in which individual pages of paper are fed into the machine. Sheet-fed offset printing is popular for small and medium-sized fixed jobs such as limited-edition books. Web breaks are considered as one of the most significant problems in a pressroom. This work concerns the analysis of relation between various parameters characterizing the paper, printing press, the printing process and the web break occurrence. In that study we can find out the cause & control techniques of web break in newspaper printing press. The web breaks are classified the paper web can have various causes, many of which have little to do with wet-end additives. For instance, the drives of the paper machine may be unstable or poorly adjusted. Some detective work may be needed to determine why the paper web is breaking. The genetic search process results into a variable set providing the best mapping for web break minimization in newspaper printing.