Method for producing a connection interface in a filter element and device for producing the same

US7018493B2 · kind B2 · utility

Assignee

• HYDAC FILTERTECHNIK GMBH · DE

Inventors

• Gerd Altmeyer · Sankt Ingbert, DE
• Jurgen Lang · Ludwigsburg, DE
• Harald Mees · Lebach, DE

Key dates

• Filing date: Jun 26, 2002
• Grant date: Mar 28, 2006
• Expiry date: Jul 1, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T156/1013
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method produces a connection interface in a tubular filter element for filtering liquids, including a filter mat (10). The opposite ends (14) of the filter mat are interconnected in a connection position by a planar weld seam (28) provided with an embossed strip in the region of the free ends (14) of the filter mat. A region is provided between the embossed weld seam (30) and the beginning of the transition towards the tubular filter mats, in which a smooth weld seam (32) is applied without embossing in a flat strip along the ends (14) of the filter mat. This arrangement enables the ends of the filter mat to be welded together in a strong and long-lasting manner. The embossed weld seam is simultaneously unloaded of any stress by the smooth weld seam.