Answer Key
- D—All of the above: Dot gain occurs when printed material looks darker than intended. This happens because the diameter of halftone dots increases during the prepress and printing processes. The optical and physical properties of the substrate and machines used both in preparing the job for print and the printing process itself cause this behavior.
- B—Nitrocellulose with polyamide: Nitrocellulose with polyamide inks are the most popular choices because they offer high gloss on surface printing and can only be used on flexo ink systems. Moreover, in the U.S. most presses are flexographic, while other countries are printing gravure.
- B—Photopolymer plates are damaged at higher levels: An excess of 20 percent acetate in the inks would lead to swelling of the polymer plates, due to absorption of these solvents, distorting the dots and leading to print failures.
- C—Resin: The resin hardens as the solvents evaporate into the air. In many cases they are the only inks that will stick to certain materials, and continue to be used when durability and function are required.
- C—Doctor blade and containment blade: The doctor blade ensures excess ink has been removed from the anilox, while the containment blade serves to keep the ink within the chambered system.
- D—All of the above: The chambered inking system is a more sophisticated way of making certain to evenly distribute ink on to an anilox roller, while at the same time ensuring ink is contained within the inking system.
- A and B—Volume of the anilox and blade selection for necessary print reproduction: Matching the correct volume anilox and doctor blade to an image will help to ensure proper print results can and will be achieved.