Project #4
To improve surface cleanliness prior to priming and coating.
01/31/2005
Polycarbonate
Optical lenses
70-85 mm diameter
Small
Less than 1 lb
Chad Mohanty
injection molding
priming and coating
120
Trade Secret
Present cleaner does not seem to have the capability to remove mold release.
Remove residual mold release and any other surface prior to coating.
No relation
Used Immediately
Need a method for evaluating cleanliness.
Four of the seven products lowered the contact angle by more than 10 degrees. The lenses cleaned with the current solvent had lower average contact angle measurements then the alternative products. However, the readings for the current solvent were more inconsistent than the alternative products. The current solvent readings ranged from 20 to 63.
After analysis was completed it was noted that some of the lenses had water spots on the back side of lens. These could be eliminated with better rinsing drying. All lenses will be sent back to client for analysis.