PRINTING TECHNOLOGY

Tackiness of Ink: High ink tack can make it difficult for the ink to transfer from the ink duct to the rollers, requiring continuous stirring. It can also lead to increased print waste and significant variations in ink density, affecting print quality. High tack might affect ink mileage due to increased key opening and the need to run over the ink density. Severe ink fading can occur, especially when new, high-tack ink lots are running on all towers. Ink being too hard to fetch from the bucket and stir in the ink duct is a common issue with high tack. "Patchy printing" and overall high black ink density can be observed with high ink tack. Excessive Acidity of Dampening: Scumming Cause : The excessive acidity eats away at the protective coating on non-image areas of the printing plate, making them susceptible to ink adhesion. Result : Ink appears on areas where it shouldn't be, leading to a dirty or dirty background. Plate Blinding Cause: The acid damages the ink-receptive...

#  S howthrough is a common print defect that is generally found in offset lithography.  Paper opacity is responsible for this type of phenomenon while ink absorption and penetration through the paper results in the visibility of printing on the reverse side of a sheet of paper under normal lighting conditions termed as showthrough. Reasons:-   This printing problem occurs in thinner papers with less pulp to create opacity.  Less fiber makes the paper more transparent.  The main reason behind the showthrough problem is the combination of ink and paper.  Tackiness of ink and excessive acidity of dampening   #  S trikethrough is similar to the showthrough print problem where the main reason is the penetration of ink through the paper or the substrate. Generally, in porous or uncoated paper this type of problem arises because of the excessive absorbent nature of paper which allows the ink vehicle to penetrate.  Moreover it can also occur ...