Most Common Printing Defects in Sheet-fed Offset Printing on Various Grades of Printing Paper

Pages:94-96
Anjan Kumar Baral, Vandana Gupta, Bijender and Sunil Kumar (Department of Printing Tech., GJUS&T, Hisar, Haryana)

Although a new variety of new automatic sheet fed offset presses are available today in market, yet vulnerability of presses towards causing various defects exist in present system. Objective of this paper is to throw light on how frequently various defects happen during press run. The results indicated that Average sheet wastage arising due to various defects occurring in typical sheet-fed offset is 5 (+/-2) %.Dot gain, hickey and mottle are most frequently and majorly occurring defects in sheet fed offset printing organizations on uncoated paper stocks. Picking, set-off and rub-off are defects majorly arising defects on matte and gloss grade coated stocks. Tinting, scumming, slur and ghosting are independent of type of paper stocks used in printing.