Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1992-11-17
1994-08-30
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
24 35, 162904, 428295, 1563043, D21F 302
Patent
active
053424867
DESCRIPTION:
BRIEF SUMMARY
The invention concerns improvements in or relating to extended nip dewatering presses and has more particular reference to a belt for use in the context of such presses.
In the press section of a papermaking machine or the like the paper web, interposed between two moisture-absorbing felts, moves in pressure contact with a press roll, being urged into such contact by a pressure shoe acting through a belt in contact with the outermost, in relation to the press roll, of the moisture absorbing felts.
The pressures applied by the shoe and the need to maximise removal of water from the paper web impose limitations on belt design, and the primary object of the present invention is to provide a belt for an extended nip press which will be capable of withstanding the pressures to which it will be subjected in use without substantial prejudice to the water conveying capabilities thereof.
The object of the invention is to provide an alternative belt for an extended nip dewatering press to that disclosed in our United Kingdom Patent Application No. 2221702.
SUMMARY OF THE INVENTION
According to the present invention there is proposed an extended nip press belt for the press-section of a papermaking machine or the like, the belt comprising an apertured membrane and an impermeable coating layer at at least one face thereof, the material of the coating layer or layers engaging the apertures in the said membrane and, in the case of a belt having a coating layer at one face only of the membrane, extending at least to the plane of the face of the membrane opposite the said at least one face, the membrane including reinforcing yarns in the running direction of the belt.
According to a preferred feature, in the case of a belt having a coating layer at one face only of the membrane, the material of the coating layer extends through the apertures in the membrane beyond the plane of the face of the membrane opposite the said at least one face.
According to a further preferred feature, the material of the coating layer extends through the apertures in the membrane to form discrete protuberances at the said opposite face, each said protuberance corresponding to a respective aperture in the membrane and the protuberances collectively defining a regularly profiled surface to the belt.
According to another feature of the invention, a coating layer is provided at each face of the membrane, the coating layers being in mutual contact through the membrane and being in fused relationship one with the other.
According to yet another feature of the invention the belt is of endless form and includes an apertured membrane piece having reinforcing yarns therein extending in a direction corresponding to the running direction of the belt, the membrane piece spanning abutting ends of an open-ended belt.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further, by way of example, only, with reference to the accompanying diagrammatic drawings in which:
FIG. 1 is a perspective view, partly cut away, showing a first embodiment of the invention;
FIG. 2 is a section on line II--II of FIG. 1, drawn to a larger scale;
FIG. 3 is a view corresponding to FIG. 1 and shows a second embodiment of the invention;
FIG. 4 is a section taken on line IV--IV of the embodiment shown in FIG. 3;
FIG. 5 is a view corresponding to FIG. 2 and shows a modified form of the embodiment shown therein;
FIG. 6 illustrates one manner in which the ends of the embodiment of FIGS. 1 and 2 may be joined together to form an endless belt; and
FIG. 7 is a view corresponding to FIG. 6 and shows an alternative way in which fabric ends may be joined.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring now to the drawings, and in particular to FIGS. 1 and 2 thereof, an ENP belt comprises an apertured membrane 11 provided with facing layers 12, 13 of a thermoset polyurethane material.
Membrane 11 is produced in accordance with the method disclosed in United Kingdom Patent Specification No. 2202873 and includes reinforcing yarns 14, for example of polyester or polyami
REFERENCES:
patent: 3617442 (1971-11-01), Hurschman
patent: 4482430 (1984-11-01), Majaniemi
patent: 4559258 (1985-12-01), Kiuchi
patent: 4740409 (1988-04-01), Lefkowitz
patent: 4973383 (1990-11-01), Filzen
patent: 5167771 (1992-12-01), Sayers et al.
Jeffery John
Kaniuka Leslie Y.
Sayers Ian C.
Hastings Karen M.
Scapa Group PLC
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