Sign & Digital Graphics

December '17

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S I G N & D I G I T A L G R A P H I C S • December 2017 • 65 lines per inch. The reason we use a low dpi is so the laser heat gets spread out so it is not blasting through the mate- rial," Stephens says. "Lower resolution basically spaces out all of the lines and we still get a nice image at the end." If a client uses a lower reso- lution for engraving, it can be advantageous to have a big- ger lens like a 2.5-inch lens or 4-inch lens on the laser. This helps when you are using a lower dpi. The spot size will be bigger and hide overlap in the lines, he adds. When it comes to fleece and flock, it is harder to get a bit of depth so the contrast is noticeable. "Those materials don't change color. We are just removing material. With twill, denim, all sorts of other fabrics, polyester, you'll typically get a color change," he says. If the fabric is red, the laser will bleach out the design so that it looks like an off white against the red. With laser cutting, the major advan- tage is the sealed edge, but it also pro- vides a fairly quick cut. "You can optimize speed on the laser system, power adjust to speed, but the frequency, how many pulses per second the laser will fire, that is typically a hertz measurement. You will want that to be a low setting, like 1,000 hertz," Stephens says. The laser can kiss cut as well. For sports emblems, you can stack multiple layers of twill, in different colors, on top of each other and adhere them together. Then, Photo courtesy of Trotec Laser Photos courtesy of Epilog Laser Photo courtesy of Epilog Laser

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