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FLEXO Magazine : May 2013
Lamp Output on Different Types of Exposure Units By Randy Reynolds Lamp intensity in exposure units is critical in the production of an AVantage photopolymer printing plate. Low intensity lamps will affect the quality of the plate being made and the finishing steps during processing. The life of a lamp is dependent upon a variety of factors, including the type of exposure unit being used, the type of lamp, operational temperature, the number of cycles run, total hours of all cycles, and the surface of the bulb being cleaned. Lamp output depends upon the type of glass in the exposure unit; smaller units have Pyrex glass while large systems have soda-lime glass. EXPOSURE UNITS 3040/3048: High output UV lamps at 350 nm can be used in the upper and lower frame sections. The output range of these lamps varies from 3.0 - 6 .5 mW/cm2 in the upper frame area. The lower glass lamp range varies from 4.0 - 6 .5 mW/cm2. Higher intensity 370 nm lamps are used in special units where the bulb position has been lowered, with an output intensity of 4.0 - 8 .0 mW/cm2. 4460/5280: Large exposure systems are built using soda-lime glass. This type of glass absorbs UV light, and the lamps are farther away from the glass surface. The upper frame area uses 350 nm lamps. The lower frame uses high intensity 370 nm lamps. UV lamp intensity varies from 2.0 +/- 0 .5 mW/cm2 in the upper frame area. Replace these bulbs when they reach less than 1.2 units. Lower frame lamp intensity varies from 4.0 +/- .5 mW/cm2. These lamps need to be replaced when they reach 2.5 units or less. Post-X: The Post-X unit for all systems uses a special, reflective, high intensity bulb at 370 nm. The output of this lamp is 20.0 +/- 1 .0 mW/cm2. These lamps should be replaced once they fall below 10.0 mW/cm2. CLEANING/MAINTENANCE Periodic cleaning of lamps on a quarterly basis will improve lamp intensity and performance. Take precautionary measures by wearing protective gloves and safety glasses. Remove dust build up from lamps using a lint-free towel and Windex® or a similar cleaning solution. Periodic cleaning of the exposure unit’s upper and lower frame glasses will also improve performance. Refer to AVantage TechTip #9 (April 2013) for complete instructions. 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 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#10 2013ExcEllEncE in FlExography awards rEcap Best of Show may2013Yello w / M agenta/ C yan/P AN T ON E2945 C / B lack/Varnish OU TL/VarnishYello w / M agenta/ C yan/P AN T ON E2945 C / B lack/Varnish OU TL/VarnishReturnAddress:TescoStoresLtd,P.O.Box5199,NorthamptonNN36ZA. A l de r shot Welcome to your newlookstore Co up ons i ns i de !Pleaserecycleme5mm5mmCMYKTESCOAldershot98.28300nxMPS162x229TESCOAldershot.indd126/11/201213:16