Awards & Engraving

December '16

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the film, the deeper the sandcarve. Four mil film is recommended for this three-stage carve. No need to washout any film. Simply expose, apply and blast. To expose the artwork onto the photoresist film, utilize the desired UV exposure unit (the Letralite UV exposure unit is a common unit). When exposing the artwork, the dull side of the photoresist film should touch the dull side of the inkjet artwork film (emulsion to emulsion). Exposure time will vary depending on the mask thickness and the age of the UV bulb. After exposure is complete, areas on the photoresist film that were exposed to the UV light are now brittle enough for sandcarving. With 4 mil pho- toresist film, a snap test can be done to ensure proper exposure. STEP FOUR: APPLYING After exposure, the dry-process photoresist film is ready to be applied to the substrate. It's important to clean the substrate prior to applying the film. This will help remove any oils or residue from the substrate and ensure more success during the sandcarving process. Apply the film to the substrate, sticky side down. This film is self-adhesive and somewhat repositionable. Use a squeegee to apply pressure to the film, which will adhere it to the substrate. If needed, use a jig or tool to help align film and design for per- fect placement. Remove the clear carrier and use a wire wheel to remove any trapped air bubbles in the film. The substrate is ready to blast. STEP FIVE: THREE-STAGE SANDCARVING PROCESS Load the substrate into the machine, set the air pressure, and start blasting. We recommend the air pressure to be set between 25 and 35 PSI with 180 silicon carbide grit. Always hold the nozzle ✦ 44 ✦ Glass & Crystal Report • A&E DECEMBER 2016 Exposure time varies depending on the mask thickness and the age of the UV bulb. at a 90-degree angle. This will help eliminate mask lift-off, which is caused by air getting under the mask during the sandcarving pro- cess. This first stage of sand- carving is considered stage one, which is the deepest stage. This area will appear closest to the viewer on the finished substrate or award. Keep in mind, the thicker the mask, the deeper the carve. The deeper the carve, the more dimension. The first stage of sandcarving is considered stage one, which is the deepest stage. After the film is removed for the second stage carve, load the substrate back into the machine and sandcarve stage two. After the first-stage sandcarving is complete, use the air blow-

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