| 摘要 |
A sonic treating apparatus in which sheet material is immersed in a shallow tank between sonic treating vibrators along opposite parallel sides thereof, which vibrators produce a horizontally sonic vibrating treating liquid in the tank. The sheets to be treated are supported with their planes horizontal and conveyed in this horizontal plane through the treating liquid transversely of its sonic vibrations so that two opposite edges of the horizontal sheets pass along and adjacent to the sonic vibrators. The conveyor may comprise a treating-liquid-resistant sprocket chain conveyor upon which the sheets rest. The sonic vibrators vibrate at a preset frequency between about 18 and 50 kilohertz and preferably between about 20 and 27 kilohertz. The treating liquid usually is for cleaning the sheets and may be an acid pickling solution for steel or phosphate coating solution, and the solution may be maintained at a predetermined elevated temperature by circulation through a heat exchanger. The temperature of the treating liquid, the concentration of the treating liquid, and the duration of the treatment are interdependent and are materially reduced from the conditions normally employed for such treatments without sonic vibrations.
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