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FLEXO Magazine : April 2013
Exposure Unit Glass Cleaning Process By Randy Reynolds The upper and lower frame glasses have a matte finish to ensure a proper seal of the cover film to the lower glass and contact seal of the substrate to the upper glass. Over time, the matte finish can become contaminated with dust, cleaning agents, tack rag residue, and even resin. These contaminates will fill-in the matte finish causing the glass to turn clear. Once the matte finish is gone, air will be prevented from escaping. This may result in a poor lower vacuum seal between the cover film and the negative being used. It may also result in a poor upper vacuum seal. When this occurs, plates may have dime size low spots, or a Zebra pattern can also occur. To correct these problems the upper and lower glasses need to be thoroughly cleaned. The following procedure is recommended for cleaning both glasses: Materials Needed: Lint-free towels, soft scrub solution or powder, sponge with Scotch-Brite on one side, protective gloves, safety glasses, two buckets of clean warm water, glass cleaner, and alcohol. Cleaning Process: 1. Open the upper frame on the machine 2. Turn the unit off at the main power supply 3. Cover the lower frame area to prevent spills and easy clean up 4. While wearing gloves and safety glasses, spray the glass with the glass cleaner. 5. Using the sponge soaked in warm water, apply the soft scrub solution to the Scotch-Brite surface 6. Using small circular rotations, apply the cleaning solution to the glass surface and clean the whole surface of the glass 7. Rinse the sponge in separate, warm water bucket to prevent a redeposit of polymer on glass. If the glass is really dirty, you may need to repeat, cleaning the whole surface again 8. After cleaning, take a lint-free towel and wipe down the glass surface, removing the residue cleaning solution. Once rinsed, repeat cleaning the glass with glass cleaner using a lint free towel. Finally, use some alcohol soaked into the lint-free towel and repeat cleaning the glass surface 9. Once the glass dries, it should have a matte look to it again. If not repeat 10. When cleaning the lower glass, the process is the same, except the vacuum lines are covered with masking tape to prevent liquids from getting into the vacuum system 11. If this fails to achieve a clean upper and lower glass, contact your local Anderson and Vreeland technical service representative for assistance. A&V’s trained personnel can perform an additional procedure referred to as “lapping.” This is done with a special tool that cleans the crevasses of the glass where resin may be trapped and not accessible without the specially designed glass tool and cleaning compounds. Safety: Please read and follow the safety recommendations for the products listed under “materials needed” before proceeding to clean the glasses. Consult the MSDS sheet regarding these products. 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#9 SQF Certification: One Printer’s Journey PSG Adapts Food Manufacturing Standards to Print Production For um W or kbook page 99 E xhib it Gu ide page31 April2013 2013Fo r um& I NF O*F LEX Wo r kb ook Chair:BobMullen,SunChemicalCorp.Co-Chair:PepperStokes,RobbieFantasticFlexibleswww.flexography.orgAPRIL28–MAY1|MARRIOTTMARQUIS&MARINASanDiegoConventionCenter|SanDiego,California O ffic i a l Exh i b i tGu i de AEXCLUSIVE