Quality Waterjet Newsletter – 01/05/2010
Cleanability Factor The terminology of machinability
has been used in the abrasive waterjet cutting
technology for many years. A similar terminology for the cleaning industry
was also proposed by Conn et al.* back in 1987. The intention was to
standardize the relative ability of a water jet for cleaning applications. A
parameter called “cleanability factor” or “erosion
strength for cleanability”, Sc, was used
to define the combined character of the substance-to-be-removed and the
substrate-to-be-cleaned. A term called “area cleaning effectiveness”, ea,
was defined as: ea = Area cleaned per unit time /
Power delivered by the nozzle. It was proposed that for a given nozzle and a fixed
set of operating conditions, the value of ea is inversely
proportional to that of Sc.
The following log-log graph was created based on some pre-existing
test data. It shows that the values for comparable substances to be cleaned
tend to group closely together. The authors pointed out that this approach
was at a very preliminary stage and encouraged further research in this
direction.
*Conn, A.F., Gracey,
M.T., and Rosenberg, W. (1987) A relative cleanability
factor, Proceedings of the fourth U.S. water jet conference, the University
of California, Berdeley, August 26-27, 1987, pp
212-216. |
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