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FLEXO Magazine : March 2013
AVantageTM Washout Bath Formulations By Randy Reynolds The AVantageTM washout bath formulation ensures the removal of any remaining unreacted resin to yield a quality photopolymer printing plate. As with any formulation, proper processing of the printing plate is very important to ensure the finished plate quality. Separate components of the AVantageTM washout bath are all liquids that are easy to dispense and good for many plate washes. Below is the recommended bath formula for different sizes of washout units. The washout bath and chemical set-up amounts are based on a fixed bath water volume. The washout water volume should be determined for an exact bath formulation. Component 3048 system 4460 system 5280 system Water 70 gallons 120 gallons 150 gallons AV Detergent 1.5 gallons 2 gallons 2.5 gallons AV Developer 1.75 gallons 2.5 gallons 3.5 gallons AV Defoamer ~.75 gallon ~1 .25 gallons ~1 .5 gallons Defoamer amounts can vary depending on the condition of the local water hardness. ALWAYS MIX YOUR DETERGENT / DEVELOPER BEFORE ADDING DEFOAMER. Procedure: First mix the detergent before dispensing the desired amount and adding it to the bath. Next add the recommended developer to the bath. Lastly, pour out the defoamer volume and add it to the bath. Ensure the washout temperature is set correctly. Run one cycle to mix the chemicals in the bath and then check for possible excessive foam. More defoamer can always be added, in small portions – 8 oz at a time. Temperature: The temperature setting for the bath will vary dependent on the resin product being used. Check with your technical representative for recommendations. Changing of the Bath: Typical bath life depends upon the type of copy, plate thickness, reclaimed, and thus the amount of liquid resin left on the plate. Maintain a log of plates washed to find your general usage results. A typical bath should last between 12-18 plates. Washout time cycle is generally 10-15 minutes. About the Author: Randy Reynolds is business manager for AVantageTM liquid photopoly- mers manufactured by Anderson & Vreeland, Inc. Reynolds is responsible for all external sales and support for AVantageTM 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. Exclusive to FLEXO TechTip#8