Filter paper for cigarette filters

US11083217B2 · kind B2 · utility

Assignee

• DELFORTGROUP AG · AT

Inventors

• Stefan Bachmann · Heimbuchenthal, DE
• Christian Mair · Innsbruck, AT
• Dietmar Volgger · Schwaz, AT

Key dates

• Filing date: Jan 24, 2017
• Grant date: Aug 10, 2021
• Expiry date: Jun 1, 2037

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H27/08
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Disclosed herewith is a filter paper for manufacturing filters for smoking articles, in particular filter cigarettes, with the following properties the filter paper comprises fibers comprising pulp fibers, at least 80% by weight, preferably at least 90% by weight, particularly preferably at least 95% by weight and highly particularly preferably 100% by weight of the filter paper is formed by long-fiber pulp fibers, of the fibers, a proportion with respect to the number of the fibers of between 2% and 10%, preferably between 3% and 9% and particularly preferably between 4% and 8% has a length of less than 0.2 mm, the air permeability of the filter paper, measured in accordance with ISO 2965:2009, is between 500 cm·min−1·kPa−1 and 15000 cm·min−1·kPa−1 and preferably between 1000 cm·min−1·kPa−1 and 9000 cm·min−1·kPa−1, the number-averaged length of the fibers in the filter paper is greater than 1 mm and less than 5 mm, preferably greater than 2 mm and less than 4 mm, and the number-averaged width of the fibers in the filter paper is between 10 μm and 50 μm, preferably between 20 μm and 40 μm, and particularly preferably between 25 μm and 35 μm.