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FLEXO Magazine : August 2013
Exclusive to FLEXO AVantage Resins and Silver Film Material By Randy Reynolds Specifications and recommendations for using silver film are detailed here. Abiding by them will obtain optimum quality reproduction when using AVantage photopolymer resins. • Base film for plates should be clear or a light matte surface. It should be smooth and free of handling defects such as nicks and dings. A heavy matte material may diffuse the UV light too much and fill reverses • Using a transmission densitometer to determine the measurement, the optical density in the clear area of the negative should be 0.05 or less. The black area of the negative should be 4.0+ to avoid reduction in etch deep of the character or midtone screens and shadows. The image should be right reading, requiring the emulsion side up on the negative (bronze plate production requires wrong reading negative, so the final product will be right reading) • Negative thicknesses are 4.0 mil and 7.0 mil. The film can be clear or matte format. Clear film is recommended to ensure quality reproduction of the negative. Do not mix negative thicknesses on a liquid exposure unit because the resulting plate will note the 3.0 mil difference in the film • A one-piece negative is recommended for platemaking. Overlapping, stripping, or taping negatives together may cause a plate tolerance problem • A high-contrast negative is needed in order to properly expose the photopolymer resin, reproducing the desired dot or screen without halos or fringes. The UV light will transmit through the character area for quality reproduction with quality structure support • Using an exposure control guide will help monitor the plate quality on a daily basis About the Author: Randy Reynolds is business manager for AVantage liquid photopolymers manufactured by Anderson & Vreeland, Inc. Reynolds is responsible for all external sales and support for AVantage liquid photopolymers, 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. Diversify Production, Trim Costs, Cut Waste 5th Annual Press Buyer’s Guide FTA’s 2013 Fall Conference & Tabletop Exhibit OctOber 14-16 | MarriOtt DOwntOwn, Kansas city, MO GOTDATA? NOWWHAT? Harness the power of your data for first-class print quality. Register for the early-bird rate on or before Sept 27, 2013 • Register online at www.flexography.org august 2013 TechTip # 13 full program detailed inside