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Trial Number 0

Trial Purpose:

To identify possible alternatives to acetone for ink removal

Date Run:

05/31/2002

Experiment Procedure:

Nine products were selected from the lab's databases based on supplied information. Six cleaners were used at 10% solutions diluted in 600 ml beakers using DI water. The other three products were used at full strength. All nine products were heated to 130 F on a hot plate.
Twenty-seven preweighed glass coupons were coated 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 bath 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.

Trial Results:

None of the aqueous products selected were effective in cleaning the ink from the glass (ND 17, Crystal Simple Green, Shopmaster LpH, Daraclean 235). In two cases the ink weight was increased due to the cleaners penetrating into the ink causing swelling (ND 17, Crystal Simple Green). The two terpenes removed over 90% of the ink (Bio T Max, OptiClear). The two esters used removed similar amounts as the terpenes (7360, Methyl Ester 1816). The alcohol based product removed around 70% of the ink (Misprint Stencil Remover). The table below lists the amount of contaminant applied and removed.
For the terpene and esters, there were some issues with obtaining proper rinsing. This issues may be improved by using a spray in place of the tap water bath rinse.

Table 1. Contaminant Cleaning 

Table 1. Contaminant Cleaning  
Cleaner Applied Remaining % Removed
Bio T Max 0.0354 0.0019 94.63
  0.0124 0.0025 79.84
  0.0641 0.0034 94.70
OptiClear 0.0352 0.0012 96.59
  0.0371 0.0004 98.92
  0.0366 -0.0005 101.37
7360 0.012 0.0013 89.17
  0.018 0.0011 93.89
  0.0116 0.0013 88.79
ND 17 0.0109 0.0137 -25.69
  0.0152 0.023 -51.32
  0.0236 0.0297 -25.85
Crystal SG 0.0268 0.0306 -14.18
  0.017 0.0273 -60.59
  0.0139 0.0341 -145.32
1618 0.0259 0.0019 92.66
  0.0224 0.0009 95.98
  0.0182 0 100.00
Shopmaster 0.0222 0.0221 0.45
  0.0271 0.0267 1.48
  0.0129 0.0126 2.33
Misprint 0.0415 0.0197 52.53
  0.0372 0.0033 91.13
  0.0144 0.0054 62.50
Daraclean 0.0253 0.0233 7.91
  0.0334 0.0293 12.28
  0.0305 0.0217 28.85

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

The four successful products will used in the second trial.  The next trial will attempt to improve efficiencies through increased concentrations for the esters and tap water spray rinse for all.

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