Severing a web
AssigneeBASF SE
InventorsClifton Zimmermann, Heribert Kuerten
Life of this patent
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Abstract
A moving web (1) is severed, after the intended length has been wound up, by fracture mechanical crack propagation starting from perforation cuts introduced by means of a laser system (9-11) into a web material embrittled by cooling (8) at the severance location.
Claims4
A method for severing a moving web of material, which comprises causing the location of the web where it is to be severed to become embrittled transversely to the direction of movement of the web and introducing into the embrittled severance location a plurality of perforation cuts in such a way that the tension of the web is sufficient to initiate cracks which start from the perforation cuts and propagate rapidly.
Dependencies are inferred from the claim text.