ACTEGA Kelstar Aqueous Coating Troubleshooting Guide
Contents
1. ACTEGA Kelstar Aqueous Coating Troubleshooting Guide TROUBLESHOOTING GUIDE FOR IN LINE AQUEOUS COATINGS PROBLEM Coating bead on tail edge of sheet Voids in coating Uneven coating film on sheet Coating foaming Bad lay of coating over ink mottling Orange peel effect CORRECTIVE ACTION Applicator roller speed Reduce roller speed running faster than blanket roller Too much pressure Release back cylinder between blanket and back pressure slightly cylinder Uneven nip pressure Adjust rollers to blanket between applicator roller KISS impressions and blanket Not enough squeeze Increase back cylinder between blanket and back pressure until even coating cylinder film is achieved Dried coating on blanket or Clean blanket or rollers rollers Pumping coating too hard Slow coating pump down forcing air into coating Coating does not contain Add manufacturers enough defoamer to recommended defoamer accommodate high sheer press side to reduce anilox coater and circulation foaming system Wax in ink other than Use wax free inks Limit polyethylene wax inks to polyethylene Dirty coating blanket Too Clean blanket Release much back cylinder back cylinder pressure pressure slightly Too much coating transfer Apply more pressure to blanket Coating between nips Slow roller viscosity too high speeds to apply less coating to blanket Lower viscosity of coating Contact ACTEGA Kelstar2. at 856 829 6300 or info actega kelstar altana com for additional information or technical assistance A member of ALTANA ACTEGA Coatings amp Sealants ACTEGA Kelstar Aqueous Coating Troubleshooting Guide TROUBLESHOOTING GUIDE FOR IN LINE AQUEOUS COATINGS PROBLEM CORRECTIVE ACTION Too little coating being Increase roller speed to transferred from rollers to transfer more coating to blanket blanket Back trap of ink on blanket Too much back cylinder Unpack blanket packing or pressure impression reduce pressure from back cylinder cylinder to blanket Ridges in coating applicator Roller is set improperly Reset roller pressure check roller coating roller Too much pressure between Release pressure between applicator roller or blanket rollers open nips and back cylinder Coating viscosity too low Change coating to higher viscosity E TEE Not putting enough coating Speed up coating unit or Insufficient drying Dry with adequate air knife and IR Coating build up on sides of sheets Coating drying too fast Slow down coating dry acd i speed ud crackin 9 Coating over excessive ink Select coating with better density film formation properties Too much coating being Slow down unit speed applied to sheet Reset NIP applicator and roller pressures Coating viscosity too high Lower viscosity of coating Picking and sticking of Select a faster drying better sheets in pile Coating drying too slow b
3. lock resistant coating Press drying system is not properly functioning a3 Increase air movement via Insufficient drying air knife Run spray powder Contact ACTEGA Kelstar at 856 829 6300 or info actega kelstar altana com for additional information or technical assistance ACTEGA A member of ALTANA Coatings amp Sealants ACTEGA Kelstar Aqueous Coating Troubleshooting Guide TROUBLESHOOTING GUIDE FOR IN LINE AQUEOUS COATINGS PROBLEM CAUSE CORRECTIVE ACTION ee eae Coating build up on edge of Reduce viscosity Adjust Stock is absorbing too much Stock moisture content is too water low less than 5 leading to excessive curl as water is absorbed from aqueous coating Sheet curl g Reduce coating weight or viscosity Too much heat Use faster setting inks with lower water pick up Lower dryer settings to lower Volatiles in ink are being amparaiu re m pie Volcanoing forced through the ink Use higher solids ink with causing a small volcano less volatiles looki id SEARS Dry inks more before applying and drying coating Contact ACTEGA Kelstar at 856 829 6300 or info actega kelstar altana com for additional information or technical assistance y A member of ALTANA ACTEGA
Download Pdf Manuals
Related Search