Press felt for paper machine and method and device for producing said felt

US8591793B2 · kind B2 · utility

Assignee

• EMS-CHEMIE AG · CH

Inventors

• Alfred Weiss · Neu-Ulm, DE
• Klaus Bender · Wehringen, DE
• Jurgen Spindler · Regensburg, DE

Key dates

• Filing date: Apr 7, 2005
• Grant date: Nov 26, 2013
• Expiry date: Jul 19, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/59
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a press felt for use in the press section of a paper machine. Said felt comprises a nonwoven layer lying on one of its surfaces, the surface of said layer being connected and fixed to the felt by a thermoplastic binding material. According to the invention, the surface of the nonwoven layer is smoothed by the application of pressure from a smooth surface during the cooling of said layer surface from a temperature in excess of the melting temperature of the thermoplastic binding material to a temperature below the melting temperature. To manufacture the press felt, an untreated press felt, which contains the nonwoven layer and the thermoplastic binding agent is first produced, the thermoplastic binding agent being distributed in the nonwoven layer in the form of thermoplastic adhesive fibres and/or a thermoplastic adhesive component of bicomponent fibres. The desired press felt is produced from the untreated press felt by means of the aformentioned temperature and pressure treatment using a smooth surface, thus enabling the press felt to be simultaneously thermofixed.