Method and system for creating an apertured web-shaped material
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United States of America Patent
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Feb 3, 2015
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app pub date -
Apr 27, 2009
filing date -
Apr 27, 2009
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Abstract
A method for creating apertures with melted edges in a web shaped material including feeding a web-shaped material through a nip between a rotational ultrasonic horn and a rotational anvil roller, so as to create melted regions in the web-shaped material, while the web is residing on the anvil roller having a rotational speed. The method further includes controlling the rotational speed of the ultrasonic horn to a speed other than that of the anvil roller, such that a speed difference is created between the horn and the anvil roller. The speed difference is selected such that a stress created in the web acts to rupture the centers of the melted regions in the web-shaped material, whereby the apertures with melted edges are created.
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