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To evaluate successful cleaners under different operating conditions.
The four successful products from the previous trial were used at full strength and heated to 130 F on a hot plate in 400 ml beakers.
Twelve preweighed coupons were coated with with a layer of Essilor Yellow Ink Y368 Akyl resin printing ink (107-87-9, 123-86-4, 108-65-6, 1330-20-7) using a hand held swab. Once the ink was dry, a second weighing was recorded. Three coupons were cleaned in each solution for 5 minutes using only stir-bar agitation. After cleaning, the coupons were rinsed in a tap water spray for 15 seconds at 120 F and dried for 15 seconds using a Master Appliance Heat Gun at 500 F. Final weights were recorded and efficiencies calculated.
The tap water rinse and the increased concentrations improved the cleaning efficiencies for two cleaners, Bio T Max and 7360. The other two soluions, Opticlear and Methyl Ester 1618, had efficiencies that remained the same as in the first trial.
|Cleaner||Initial wt of cont.||Final wt of cont.||%Cont Removed|
|Bio T Max||0.045||0.0004||99.11|
|Bio T Max:||Solution turned cloudy yellow within 15 seconds. Most of the ink was gone in less than 2 minutes.|
|Opticlear:||Solution turned yellow within 15 seconds. Most of the ink was gone in less than 2 minutes. Yellow haze appeared after drying.|
|7360||Solution turned yellow within 30 seconds. Most of the ink was gone around 3 minutes. Less yellow haze than Opticlear.|
|1618||Solution turned yellow within 30 seconds. Some ink spots remained after cleaning.|
Success Rating:A follow up test, usually based on company input.
The four solutions will be used in the next trial to clean the supplied optical lenses.