Method and system for creating an apertured web-shaped material
AssigneeSCA Hygiene Products AB
InventorMarcus Lehto
Life of this patent
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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.
Claims10
A method for creating apertures with sealed edges in a web shaped material comprising:
- 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 said web-shaped material, while the web-shaped material is residing on the anvil roller having a rotational speed, and
- controlling the rotational speed of the ultrasonic horn to a nonzero speed other than that of the anvil roller, such that a speed difference is created between the horn and the anvil roller,
- wherein the speed difference is selected such that a stress created in the web-shaped material acts to rupture the centers of the melted regions in the web-shaped material, whereby said apertures with sealed edges are created.
Dependencies are inferred from the claim text.