Device for folding a web of material

US6290635A · kind A · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Filterwerk Mann & Hummel GmbH · DE

Inventors

• Joerg Demmel · Stuttgart, DE
• Andreas Levermann · Gerlingen, DE
• Siegfried Rapp · Murr, DE

Key dates

• Filing date: Jun 18, 1999
• Grant date: Sep 18, 2001
• Expiry date: Jun 18, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/11231
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An apparatus and method for producing a zig-zag folded filter element from a web of material (18), which is supplied through a feeding device to a stamping unit (10). To define the folding line, the stamping unit is fitted with an anvil roll (21) and a stamping die (24), the stamping unit being ultrasound activated and thereby improving the stamping operation.