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Some inks just don’t seem to dry. For example, metallics tend to lay on top of non-porous sheets, drying only on the outside, not the inside. If this semi-cured ink receives significant pressure, it may pop, resulting in unsightly marking or scuffing. Even if you’re able to get a job with “wet” ink safely to your finisher, almost all bindery processes force sheets to rub somewhere, creating pressure. Potential problems lurk when bindery intensive jobs are combined with troublesome inks such as reflex blue, rhodamine red, or metallics.
What You Can Do
•If you foresee problems, modify your ink selection whenever possible.
•Stack sheets in smaller lifts as they come off the press.
•Seal potentially problem sheets with UV, aqueous, or varnish coatings.
•Notify your client that extra drying time may be needed.
•Increase your spoilage allowance.
•Carefully choose your bindery partner. Years of experience is critical.
What Your Bindery Can Do
•Wherever a piece being converted rubs against a stationary part of a machine (i.e., nose and/or ribs of a folder plate, wheels on a packer, etc.), attempt to relieve the pressure.
•Reduce pocket feeding loads to relieve pressure (see diagram).
•Minimize “transit marking” by tightly packing finished product without focused pressure from straps or bands. Use chipboard on the top and bottom to evenly distribute force.
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