Printwear

December '11

For the Business of Apparel Decorating

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From Software to Substrate continued from page 24 Product Highlights MP unit in Taylor, and has accepted the position. What makes this even more inter- esting is that she was one of the screen printers at Heritage before she enlisted. OPERATION GRAY SCALE We began creating this personal project by opening a color photo into Photoshop. It was simply an emailed jpeg image in fairly low resolution form, which was okay since it was just an exercise and we were changing it up anyway. For the project, we would run a gray scale or duotone of the photo, so we would need to turn the full-color photo into a black and white. With the image open in Pho- toshop, we chose Image then Adjustments and Hue/Saturation from the top menu. Adjusting the saturation slider all the way to the left, at 100 percent, and bingo—the color was gone but the tonal values remain. There was the gray-scale image. We saved the image as a .psd document on the desktop, then reopened the black and white image in raster separation software for a simulated-process separation. The software did its thing and we had eight plates ready for output. Of course, black and white duo tone does not require any info on the colored plates, so we deleted all the unnecessary colors, leaving only the first-down white printer, a gray and a highlight white. We also built a black to reintroduce the detail that would need to go back over the background treatment. For the background, just to make it interesting, we output the gray as large as pos- sible through the inkjet-to-film printer. We could go almost 17" wide by about 19" tall. Setting our halftone size in the RIP to a big 20 lpi (lines per inch) would result in a really chunky halftone background image. The other three plates were output at only 8" wide at 50 lpi, all at a standard 22.5-degree angle so we could rebuild the black-and-white photo over the background gray. PRODUCTION SCOPE The oversized gray film was exposed on a new, larger static framed screen with 305 mesh stretched to 20 N/cm. The balance of the plates went on 230s all at 20 to 25 Newtons. To help control the whole process, Heritage now insists that all the new static aluminum screens come in the door no lower than 20 N/cm tension on the mesh. The stencils were all built using a good dual cure emulsion and a new coat- ing method at two-over-three, ending on the squeegee side and dried substrate-side down. The inks were pretty straight forward. The gray background ink would need to be super soft and very thin to print through the 305. We thinned down some standard white with curable reducer about 90 percent. At that point, the ink had so little pigment and the mesh and thin stencil contributed to a thin ink deposit, which resulted in an ultra-soft dark gray treatment in the background. It almost looked like a ghost image of the photo. We would then print the three-color duo-tone right on top of the gray background, all wet-on-wet. The print order was an under-base white, then black and finally the highlight white. The white inks had to be thinned about 10 percent to flow through the high screen mesh. Viola! Nancy loved the prints. Heritage Logo Works learned a pretty simple and very effective technique that showcased the upgrades to their process. Mission ac- complished. And, to Davis and Williams, and all the U.S. military, thank you for what you do, from all of us in the decorated-apparel industry. pw Use INFO #715 58 | PRINTWEAR DECEMBER 2011 Welcome to the Product Highlights section where each month we offer you resources to enrich and expand your business with great services and products from our advertisers. Visit info.printwear- mag.com to quickly fi nd and request free information on the suppliers featured in this section. Or, use the GET INFO form on page 107 to request information by mail or fax. You will have the option to re- quest information from a specifi c supplier by using their INFO# noted at the bottom of their ad or from an entire group of suppliers organized by category. It's your choice and the information is customized for your business needs. | | | |

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