Effect of Rotating Cup Shapes and Spray Conditions on Paint Atomization

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  • 高速回転霧化式静電塗装機による塗料の微粒化
  • コウソク カイテン ムカシキ セイデン トソウキ ニ ヨル トリョウ ノ ビリ

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In order to clarify the atomization of paint by means of a high-speed electrostatic rotary atomizer, which is usually used at the rotational speeds above 10,000 rpm (or the peripheral speeds above 40 m/s), stroboscopic photographs were taken around the edges of various rotating cups at the various spray conditions, and the diameters of paint particles were measured by means of the immersion liquid method. The results are summarized as follows : <BR>(1) In the case of the rotating cup with a sharp edge, filmlike atomization occurs. Provision of saw-teeth and grooves for the cup edge makes paint to be atomized in filamentlike mode, but it does not affect Sauter's mean diameter of the paint particles.<BR>(2) The atomization mode is not dependent on paint flow rate, paint viscosity and cup rotational speed. However, the particle diameters change remarkably. The atomization mode and particle diameter are little influenced by applied voltages.<BR>(3) The particle diameter increases with film size in the filmlike atomization, and with filament length in the filamentlike atomization. However, the particle diameters are independent of atomization modes.

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