Sign & Digital Graphics

October '17

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34 • October 2017 • S I G N & D I G I T A L G R A P H I C S DIGITAL PRINTING AND FINISHING DIGITAL GRAPHICS stand the high level of heat generated by the fuser rollers without warping or melting. Laser certified printer papers are quite resistant to high temperatures and are usually uncoated since any coat- ing could melt in the printer, destroy- ing the sheet and possibly ruining the printer. Plain white bond that is certified for laser printing is the most common stock used universally in offices and by individ- uals. Toner bonds best to smoother and whiter surfaces, resulting in finer details and better clarity. Less expensive, courser papers can deposit lint in the printer, so it's advisable to avoid uncertified bargain sheets. In the past few years, many general- purpose SOBs of weights 21 to 27 lb. have been reformulated to work equally well with both inkjet and laser printers. Be warned though that these papers are only suitable for printing text because of its lighter ink load. For all types of paper, printer driver settings should be configured to suit the specific paper so that the printer deposits the correct quantity of ink (see Figure 3). Inkjet and Large-Format Paper Paper designed for inkjet and large format printing are of better quality. Categorized by its weight, brightness, texture and opacity, inkjet papers require dimensional stability and adequate sur- face strength. Smoothness and limited porosity is also necessary to counteract excessive dot gain (see Figure 4). Quality paper grades are frequently coated. For matte inkjet papers, silica is used as pigment in a medium of polyvinyl alcohol. Glossy inkjet papers are made by applying multiple coats of silica, or coat- ing the substrate with polymer resin that imparts specific qualities to the paper including weight, gloss, smoothness and reduced ink absorbency. Various materials, including kaolinite, (a type of clay), calcium carbonate, benton- ite (absorbent aluminum phyllosilicate clay) and talc can be used to coat paper for high quality printing. The coating Figure 3: For all types of papers, settings on your printer driver should be configured to suit the specific paper being used so that printheads deposit the correct quantity of ink. Figure 4: Dot gain or ink spread happens when ink is wicked away from the contact point. Figure 5: Fine art papers are available in several surfaces and tones including smooth, water- color, and even canvas.

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