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FLEXO Magazine : February 2013
AVantageTM Plate Setup Formula By Randy Reynolds All photopolymer resins shrink slightly when exposed and cured during the platemaking process. The AVantageTM line of liquid polymers is no different. To set the proper shim pack, the resin shrinkage rate must be accounted for in the setup. First and foremost, you must determine the target plate thickness desired. Next, the question becomes, “Is the film thickness being used to make the printing plate?” There are many different types of film being used these days to produce printing plates. • There is the old standard silver film at 4 mil and 7 mil thickness • The new AVSTAR printed film sold by Anderson & Vreeland, Inc. is available in 5.5 mil and 8 mil film bases. The system uses a piece of cover film to protect the negative and seal it to the lower glass. The cover film is generally 0.7 mil thick. The following equation will set the shim pack to make the desired plate requirements using AVantageTM resins: Examples: • 67mil+1+1.5+4milsilver=73mil • 67mil+1+1.5+5.5printedfilm=75mil • 250mil+1+5+7milsilver=263mil • 250mil+1+5+8milprintedfilm=264mil Note: Plate exposure times will be different for silver film and printed film because printed film has a UV coated layer to generate the density needed with the ink coating to prevent the UV from coming through the dark black areas of the negative. About the Author: Randy Reynolds is business manager for AVantageTM liquid photopolymers manufactured by Anderson & Vreeland, Inc. Reynolds is responsible for all external sales and support for AVantageTM liquid photo- polymers, including corrugated, multi-wall bag and stamp resins. He is a seasoned veteran in the flexo industry with 16 years of sales and management experience. Exclusive to FLEXO TechTip#7