Printwear

October '16

For the Business of Apparel Decorating

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2 0 1 6 O C T O B E R P R I N T W E A R || 57 Why don't the ink companies make just one white ink? Inks, including white ink, are made with different percentages of pigment to achieve different levels of opacity. More opacity, and therefore more pigment, is required on a black garment than a light- colored garment, for example. Inks with more pigment will offer more resistance to printing. Synthetics like polyester, which are liable to bleed, should be print- ed with a low-bleed ink. These are inks with gas added that expands from heat into many tiny air bubbles in the ink film. Dye in the garment will not pass through air. However, these air bubbles leave a sandpaper-like feel to the ink. The colors of synthetic garments most likely to produce dye migration are red, maroon, and green. Tie-dyes are the worst. ROGER JENNINGS, R. JENNINGS MFG. CO. What are glitter inks and how do I screen print them? The primary function of glitter inks is to add decorative value to an otherwise basic design. Glitters are made from an optimum blend of polyester materials and are generally mixed into a clear plastisol base to make them easy to print. Glitter pieces range in sizes from .004hex to .008hex and are cut in hexagonal shapes to produce the most eye-catching colors and decorative effects. When printing with plastisol glitter inks, use a lower mesh count, such as 24–40. You might also want to have a squeegee durometer of 65–70. Apply hard and slow pressure and speed for your squee- gee and flood bar. Set the curing temperature at 320 degrees F, and the flash temperature at 230 degrees F. Glitter ink is best suited to cotton, polyester, and blends. It's recommended that you double print, flash, and double print to increase the ink deposit. MARIO FARJADO, FLORIDA FLEXIBLE PRODUCTS What's the secret to a good bond between an aluminum frame and mesh? Aluminum screen frames are not porous, so to ensure a strong mesh-to-frame bond, the frame needs to have a rough exterior. Once the frame's surface is roughened, wipe the surface area clean with acetone. This will remove any loose debris to help ensure a perfect surface for the adhesive to "grab" onto. Next, apply the adhesive to the raw frame and let it dry. Once dry, stretch the mesh and add weights to the center of the frame, if necessary. This will help to ensure intimate contact between mesh and frame. The next step is to apply a bead of adhesive on top of the mesh around the perimeter of the frame using a plastic squeegee to spread the ad- hesive evenly over the surface. Once dry, release the tension on the stretcher and trim off the extra mesh from the sides of the frame. GREG MARKUS, RHINOTECH My PMS colors match when I print them on a white shirt, but not on an underbase. What can I do? This is something that we had to tackle at our print shop. We have never had an issue with uncoated colors matching on white under- bases, but coated colors were a whole other story. Coated PMS colors were never intended for the textile industry, but the problem is that most other print media is done with coated colors. Clients want their T-shirts to match their pens, business cards, let- terhead, and all other media that has their logo; so naturally, screen printers need to offer coated colors as well. We can mix these colors and get very reasonably close to the PMS books, but once we print these colors on an underbase, it gets too light. For these instances, we decided not to alter the PMS colors themselves, but rather our underbase color. We, like most screen printers, have always used a white undrerbase. The problem was that the white was so bright it lightened up the PMS color to the point that there was no way that the end user would find the match acceptable. We decided to mix a gray underbase with our standard white ink. Our theory behind this was that it would dull the white down, and therefore our PMS match would stay truer. After weeks of talking with our ink distributors and doing internal testing, we found a for- mula that achieved just the result that we were looking for. I would strongly recommend that before you start doctoring your inks that you discuss it with your ink manufacturer first to be sure that the chemistry of the inks that you are mixing will coincide with each other without any negative results. TERRY KEEVEN, ST. LOUIS PRINT COMPANY SCREEN PRINTING

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