The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Jul. 03, 1986
Hans K Schuster, Bruckmuhl, DE;
Jens-Peter Heins, Feldkirchen-Westerham, DE;
Bernhard Gockel, Germering, DE;
Holger Schmidt, Munich, DE;
Gessner & Co. GmbH, Mangfall, DE;
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. As a result of this reduced pressure, the strip is pressed onto the edge of the guide plate so that the measuring chamber is laterally sealed and air can flow in only through the measuring openings. A filter can be provided between the measuring openings in the meauring plate and the measuring air connector. An additional suction connector enables cleaning of the filter and of the measuring chamber by means of cleaning air introduced through the measuring air connector.