A washing device was designed in order to estimate the force necessary to remove solid particulate soils. Polystyrene particles adhering to a glass plate, and polyester, acetate and cellulose films were removed using this device, and F
H1/2-the force necessary to remove the soils-was estimated.
The following results were obtained:
1) The F
H1/2for large particles was estimated to be larger than that for small particles.
2) The order of F
H1/2for several substrates was: polyester>acetate>glass>cellulose.
3) The F
H1/2obtained by the third improved model of our washing device was compared to the F
H1/2by the prototype and second improved model, which have already been reported. The values existed in the order: Prototype>Second≅Third improved model.
4) These values were compared to the values obtained for detergency by laminar flow between concentric cylinders, and F
H1/2was: polyester>glass>cellulose. The F
H1/2was laminar flow between concentric cylinders>third improved model except for polyester substrate.
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