Abstract
Polystyrene particles adhered to a glass plate were removed by a laminar flow produced in a wash-ing device equipped with a turn table of a gramophone and in a Terg-O-Tometer. The separating force was estimated from the viscosity resistance of the particles in a laminar flow. Relationships between the separating force and the removal percentage of particles from substrate were elucidated and the following results were obtained.
1) When the particles were removed at various rotation speed, the removal percentages were almost invariable, though the separating force increased.
2) The removal percentage increased with increasing surfactant concentration, in spite of almost invariable separating forces.
3) The removal percentage increased markedly with increasing washing temperature, though the separating force decreased.
4) The removal percentage obtained by use of a Terg-O-Tometer was similar to that obtained by use of a laminar flow.
