Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Reexamination Certificate
1999-04-13
2002-06-18
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
C492S007000
Reexamination Certificate
active
06406596
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a press roll and more particularly, a press roll and press system having a press roll for the treatment of a fibrous material web such as a paper or cardboard web, in at least one press nip.
2. Discussion of Background Information
Press rolls are known in the related art. One such press roll is mentioned in German Patent Application No. DE-U-92 03 395. This press roll is a shoe press roll, and the press sleeve is also supported in a known manner by at least one support device against a solid stationary yoke, which serves as a flexural carrier and is thus bent according to the varying load. Sagging of the yoke may, however, have a disadvantageous effect on the shoe and guidance of the sleeve. It is often advantageous for deviations from a starting position of this shoe and sleeve guidance to occur. In the press roll of the related art, the effect of sagging of the yoke perpendicular to the plane of the press is countered in that the press shoe is movable relative to the yoke. -However, adequate positional stability of the shoe and sleeve guidance has heretofore not been possible. This is especially true for situations when, for example, a press roll is used as a central roll between two additional press rolls and, consequently, the supporting forces act in different directions.
German Patent Application No. DE-A-33 17 455 discloses a known press roll whereby the press sleeve surrounds a non-rotatably mounted hollow carrier, which is supported internally against an inner flexural carrier by a support device. However, this press roll lacks an outer support device enabling variable adjustment of the support forces positioned between the outer carrier and the inner carrier.
It is thus desirable to provide a press roll and press system having a press roll that has none of the aforementioned difficulties.
SUMMARY OF THE INVENTION
The present invention provides a press roll, system and method for the treatment of a fibrous material web. The press roll of the present invention forms at least one nip with a respective mating surface, and comprises a non-rotatably mounted carrier, a press sleeve surrounding the carrier, and at least one outer support device disposed between the carrier and the press sleeve, the press sleeve being supported against the carrier at a respective press nip. The press roll also has a sagging control system adapted to control the sagging of the carrier. The sagging control system may also compensate for sagging produced by the forces in the region of the press nip. Two outer support devices may be provided, with a space extending therebetween in a circumferential direction of the press roll. Additionally, the press sleeve may also be supported against the carrier, to form at least two press nips with respective mating surfaces.
According to an aspect of the invention the carrier may be a bimetal carrier and the sagging control system may further provide a heating system to heat the carrier. Furthermore. The carrier may be slotted and a brace may also be provided to brace the slotted carrier. Additionally, a mutual radial bracing device to brace the carrier and the inner carrier may also be provided. The mutual radial bracing device may brace the carrier and the inner carrier by hydraulics, pneumatics, mechanics, thermal, and/or electromagnetics. Alternatively, the carrier may be an outer hollow carrier having a non-rotatably mounted inner carrier disposed therein.
The sagging control system may include an inner support device disposed between the hollow carrier and the inner carrier. The inner support device may include a group of inner support device support elements perpendicularly extending relative to a direction of travel of the web. Furthermore, the hollow carrier and the inner carrier may each be mounted on their respective ends at a point equidistant from each other.
In accordance with another aspect of the invention, the press sleeve may be a flexible press sleeve and be designed as a shoe press roll. The outer support device may further comprise at least one press shoe and a plurality of outer support device support elements disposed in a group perpendicularly extending relative to a direction of travel of the web. Additionally, the inner support device may include at least one group of inner support device support elements perpendicularly extending relative to a direction of travel of the web, and the inner carrier support elements and the outer support device support elements may each include at least one cylinder/piston unit.
The press roll may also comprise at least one inner support device disposed between the carrier and the inner carrier, with the inner support device being configured to apply a force and act in a predetermined direction, wherein the sagging control system controls sagging of the carrier and wherein sagging resulting from different directional pressing forces is compensated. Also, at least two nips may be included. The two outer support devices may also be disposed between the carrier and the press sleeve.
According to yet another aspect of the invention, the direction of action of the inner support device lies in a resultant direction of action of the two outer support devices. Furthermore, each force applied by the two outer support devices may have the same magnitude. Additionally, each of the two outer support devices may be configured to act in a radial direction offset by approximately 120°. The forces applied by the two outer support devices and the force applied by the inner support device may be at least substantially of the same magnitude and form an equilateral triangle of forces.
The group of outer support device support elements and the inner support device may further have the same pitch and may each have pistons having the same piston area. The forces applied by the two outer support devices may be the same magnitude and form an isosceles triangle of forces with the force applied by the inner support device. Furthermore, the total piston area of the inner support device may generate a force at least substantially compensating the force resulting from the two outer support devices. The group of support elements of the two outer support devices may have the same pitch and the support element pistons may have the same piston area. Also, the total piston area of the inner support device may generate a force at least substantially compensating the force resulting from the two outer support devices. The individual piston areas of the inner support device support elements may be the same size as the individual piston areas of the support elements of the two outer support devices. The total piston area of the inner support device may be determined by the number of the inner support device support elements.
The piston pitch spacing of the inner support devices may be the same as that of the two outer support devices wherein the total piston area of the inner support device may be determined by the size of the individual piston areas. Also, the direction of action of the inner support device may lie in the bisector of the angle between the radial directions of action of the two outer support devices. Furthermore, the forces applied by the two outer support devices may have different magnitudes and may form a scalene triangle of forces with the forces applied by the inner support device. The group of support elements of the two outer support devices may have an unequal pitch and/or different sized piston areas. Additionally, the entire piston area of the inner support device may generate a force at least substantially compensating for the force resulting from the two outer support devices.
According to still another aspect of the invention, each of the two outer support devices comprises at least one press shoe, each press shoe having an equal width extending in the direction of travel of the web. Additionally, the two outer support devices and the inner support device may each have variably adjustable pressure. Sleeve guide rails disposed interme
Chin Peter
Greenblum & Bernstein P.L.C.
Hug Eric
Voith Sulzer Papiertechnik Patent GmbH
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