Arrangement and method for manufacturing can lids

US9242289B2 · kind B2 · utility

Assignee

• SCHULER PRESSEN GMBH · DE

Inventors

• Klaus Blei · Schallstadt, DE
• Markus Röver · Stuttgart, DE

Key dates

• Filing date: Sep 29, 2011
• Grant date: Jan 26, 2016
• Expiry date: Nov 20, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2101/125
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In a method according to the invention for the manufacture of tear notches (22) in can lids (11), the can lid (11) is subjected in the press tool (10) to a laser engraving during which the desired tear notch (22) is generated. The laser ablation process occurs preferably, with the press tool (10) closed, within a time period of less than 30 ms. During this time, the focal spot (27) of the laser beam (26) is moved over the whole desired contour of the tear notch (22) so that an uninterrupted groove-like cavity is formed. With the use of laser engraving in the press tool, the mechanical wear of the press tool and of the press molds can be minimized and in this way the tool operating life can be increased. In particular, the manufacture of can lids with consistently high quality is ensured.