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:
Mar. 06, 1990
Filed:
Sep. 27, 1988
Harry I Myren, Karlstad, SE;
Valmet Paper Machinery, Inc., Helsinki, FI;
Abstract
In a tissue paper machine, the dust that is released when the web is creped off the Yankee dryer (3) constitutes a major work environment problem. To provide an improved extraction of the dust and thereby improve the work environment for the operating personnel involved, a dust extractor (25') having an internal space (39') and a web stabilizing, imperforate plane (37') is mounted immediately adjacent to an intended path of travel for the creped web (1) so that the web during its transportation will place itself in a fixed position close to the imperforate plane (37'), and, at least an essential part of an entrained boundary layer of dust containing air is eliminated through suction only, to the internal space (39'). The suction is carried out at the rear and/or front edge of the extractor (25), and suitably both on the overside and underside of the web (1). Dust that does not become entrained in the boundary layers will be sucked away by at least one dust suction box (55) having a sloping suction box cover (57), and mounted under the web (1) and spaced therefrom at doctor beam (11). Preferably, an air stream, which is of sufficient force to carry the dust and caused by the suction, is made rise towards the web (1) between the dust suction box (55) and a dust extractor (27) mounted downstream of the latter.