Coating method employing ultrasonic waves
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United States of America Patent
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Aug 9, 1994
Grant Date -
N/A
app pub date -
Apr 16, 1993
filing date -
Apr 21, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A coating method by which the speed of coating can be improved remarkably regardless of the number of polar groups on the surface of a web and irrespective of the properties of material for the web. A coating solution flowing out of a liquid injector is applied to a web supported by a coating backup roller. A high frequency signal from a master oscillator is amplified and applied to a vibrator. Ultrasonic waves generated in the vibrator are guided by a horn to be radiated to the contact line between the coating solution and the web. With the invention it is possible to prevent a coating solution from being intermittently applied to a web, and it is also possible to increase the coating limit speed, for example, by 5 to 26%. In addition, lateral stair-stepped unevenness of thickness is not produced in the coating layer.
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