Trial #1
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 solutions, 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
|
0.0450
|
0.0004
|
99.11
|
|
|
0.0072
|
-0.0002
|
102.78
|
|
|
0.0323
|
0.0001
|
99.69
|
| OptiClear
|
0.0369
|
0.0004
|
98.92
|
|
|
0.0318
|
0.001
|
96.86
|
|
|
0.0513
|
0.0004
|
99.22
|
| 7360
|
0.0297
|
0.0006
|
97.98
|
|
|
0.0822
|
0.0014
|
98.30
|
|
|
0.0770
|
-0.0001
|
100.13
|
| 1618
|
0.0500
|
0.0014
|
97.20
|
|
|
0.0429
|
0.0010
|
97.67
|
|
|
0.0484
|
0.0034
|
92.98
|
| Observations:
|
|
| 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.
|
The four solutions will be used in the next trial to clean the supplied optical lenses.
No relation