Measuring head for measuring the porosity of a moving strip

US4672841A · kind A · utility

Assignee

• Gessner Holding AG · DE

Inventors

• Hans K. Schuster · Bruckmühl, DE
• Jens-Peter Heins · Feldkirchen-Westerham, DE
• Bernhard Gockel · Germering, DE
• Holger Schmidt · Wuppertal, DE

Key dates

• Filing date: Jul 3, 1986
• Grant date: Jun 16, 1987
• Expiry date: Jul 3, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2015/086
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a measuring head for measuring the porosity of a moving strip of porous material. The measuring chamber of the measuring head is covered by a measuring plate in which measuring openings are provided. For porosity measurement, air is sucked in through the porous strip and the measuring openings into the measuring chamber. The amount of air flowing into the measuring chamber is measured by a measuring arrangement connected to the measuring air connector and serves as a measure of the porosity of the strip. The measuring plate is surrounded by a guide plate which partially overlaps a blowing ring. The guide plate and blowing ring together form a blowing slot surrounding the measuring plate, the blow-out opening of which is directed outwardly and tangentially to the lower surface of the moving strip. The necessary blowing air is introduced via a connector into an annular channel, which is formed from a semi-circular groove in the blowing ring and merges into the blowing slot. The blowing air flowing horizontally from the blow-out opening produces a reduced pressure between the lower surface of the moving strip and the curved upper surface of the blowing ring. A…