Sign & Digital Graphics

Start Here October '18

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38 S T A R T H E R E 2 0 1 8 The basic exposure unit for photoresist uses UV light to process the material. Nowadays there are two types of photoresists on the market: one that requires water for washing it out and another that is a dry process film. It is best to try out both to decide which suits your work best. To set up a dark room area requires about 6 linear feet with a washout station or 4 linear feet for dry processing only. The lighting needed is as simple as using yellow "bug" lights from the grocery store. Tables for product preparation and clean-up and/or color application. One to two 8-foot tables are a good space, and if you are going to do a lot of color application, a spray booth may be a good investment (about $350). Access to water will facilitate the clean-up process since photoresist will float off any substrate once submerged for a short time. Your preparation area needs to be a clean space away from blasting activities. Your table needs to be covered with carpet if you are applying stencils to glass objects. This helps you prevent scratches on glass as the glass is cushioned by the carpet and any small debris items will fall into the nap of it. A couple of tape dispensers help in the preparation of items to be blasted as well as a roll of cling wrap. The most common items used are paper towels or wipes and a glass cleaner without ammonium. Large trash cans help keep your work area clean. I mentioned two tables: use one as a clean table for preparation and another, in a separate spot, for clean-up, which may mean some abrasive can be present. Color application is an often-requested add-on treat- ment for blasted items and requires, besides the obvious paints, an area that is well ventilated and possibly has an exhaust system. Acquiring an appropriate respirator is also a must-have piece of equipment—make sure it is rated by OSHA for vapors. The best respirators are dual-cartridge models with exchangeable filters (approximately $50). Aliento School Information For 20 years, Ruth collaborated with her husband Norm Dobbins in commission work, writing books and creating video- tapes on how-to techniques for glass etching. Norm and Ruth taught these techniques for 30 years in the U.S. and other countries. Ruth continues these venues by offering a complete training program at Aliento School in Santa Fe, New Mexico, and by teaching at various trade shows. One-on-one training and consulting services are also offered. Basic UV expo- sure unit for processing pho- toresist of any kind. Artwork transparency is superimposed on a sheet of photo- resist film prior to exposure. The transparency and film are inserted onto the clear cylinder of the exposure unit and covered with a flexible black blanket. The UV light is turned on to expose the material. (Images courtesy Ruth Dobbins)

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