Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1997-12-22
1999-12-21
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162206, 1623584, 1623591, D21F 304
Patent
active
060044292
ABSTRACT:
A machine and method for producing a fibrous material web, in particular a tissue paper or bathroom tissue web, whereby the machine includes at least one pre-press embodied as a shoe press, a main press, in the form of a press roll, and a drying cylinder, an endless top belt guided through the nips of the pre-press and the main press, and an underfelt guided via a bottom roll of the pre-press, wherein the top belt supplies the fibrous material web that has been preformed in a former first to the pre-press and then to the main press. The pre-press, which is embodied as a shoe press and has a nip that is elongated in the web travel direction, includes an upper shoe press unit and a bottom roll disposed opposite this. The upper shoe press unit is provided with a smooth, rotating flexible press belt. The bottom roll is grooved. A relatively dense overfelt is provided as the top belt whose water permeability is lower than that of the underfelt, but in the main press when pressing against the drying cylinder, still permits the removal of additional water from the fibrous material web. The press roll associated with the main press has a perforated and/or grooved surface for absorbing expressed water.
REFERENCES:
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patent: 4192713 (1980-03-01), Valkama
patent: 4880501 (1989-11-01), Schiel
patent: 5393384 (1995-02-01), Steiner et al.
patent: 5520782 (1996-05-01), Schiel
patent: 5755931 (1998-05-01), Schiel
patent: 5810974 (1998-09-01), Laapotti
Hastings Karen M.
Voith Sulzer Papiermaschinen GmbH
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