To test spay washing for removal of the contaminant. Pre-pilot scale testing.
Date Run:
11/02/1998
Experiment Procedure:
Preweighed coupons were covered with the contaminant solution on one side of the coupon. Coupons were dried using a Infrared heat lamp for 10 minutes. After returning the samples to room temperature, the contaminated weights were recorded. All of the samples were clipped to a tray and inserted into a Miele Automatic G7735 Spay Wash Unit. The cleaning chemistry was heated to 130 F on hot plates. The solution was then poured into the unit. Cleaning lasted for 2 minutes. At the end of the cleaning, the coupons were rinsed with room temperature tap water for 15 seconds. Samples were dried using the IR heat lamp. Final weights were recorded and the cleaning efficiency was calculated.
The spray unit was effective in the removal of the contaminant from the samples. Table 1 lists the overall cleaning efficiency calculated from the 12 coupons tested.
Table 1. Average Efficiency Cleaning Efficiencies for Each Coupon
Cleaning Efficiencies for Each Coupon
88.81
81.89
66.47
78.47
79.91
88.89
89.17
90.63
70.21
58.54
88.77
94.58
Ave
81.36
Std Dev
11.14
There was a slight residue remaining on the coupons after the rinsing and drying. The coupons were visually clear of the contaminant solution. The low cleaning efficiencies were probably due to the residual film.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Soy Gold 2000 showed excellent removal of the D-Greeze 500 contaminant solution. The one remaining issue to deal with would be the removal of the film left on the coupons. Increased rinse water spray pressure could help to reduce or eliminate the residue. Pilot scale testing will be conducted on samples provided by the client.
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