Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1988-09-27
1990-03-06
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162207, 162272, 162363, 1525651, 15306A, D21G 900
Patent
active
049063332
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.
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Fisher Richard V.
Upton Christopher
Valmet Paper Machinery Inc.
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