Beware of dry air

Postpress Paper performance is not unlike that of a grand piano before a concert. The ideal environment for a piano will keep the tones crisp and prevent string shrinkage or sounding board warping. Good paper performance in the pressroom and bindery often will mean perfect ink placement without blurring or smudging, or paper consistency without curling or shrinking at the edges or unfortunate stretching. In high-speed presses, a new element of stress is added as machinery heat causes a serious drop in relative humidity (RH) —sometimes down to 25 to 35 percent RH—resulting in static electricity and web ...

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