CA2201668C - Roll press - Google Patents
Roll press Download PDFInfo
- Publication number
- CA2201668C CA2201668C CA002201668A CA2201668A CA2201668C CA 2201668 C CA2201668 C CA 2201668C CA 002201668 A CA002201668 A CA 002201668A CA 2201668 A CA2201668 A CA 2201668A CA 2201668 C CA2201668 C CA 2201668C
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- CA
- Canada
- Prior art keywords
- press
- roll
- gap
- additional
- jacket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/24—Arrangements of devices using drying processes not involving heating
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Friction Gearing (AREA)
- Replacement Of Web Rolls (AREA)
Abstract
A roll press for a cardboard or paper making machine that includes a suction press roll that lifts a cardboard or paper web from a screen and transfers the same to a press felt guided around the suction press roll and includes a pay-out press roll that forms a press gap with the suction press roll. The press felt and the cardboard or paper web may pass through the press gap, and, once through the press gap, the cardboard or paper web may be adhered to the pay-out press roll for paying out the cardboard or paper web to a subsequent part of the paper making machine. Both the suction press roll and the pay-out press roll are each associated with at least one additional press roll. The press rolls may be arranged to form three press gaps, at least one of which is an elongated press gap elongated in a travel direction of the cardboard or paper web. This arrangement provides a higher dewatering capacity in a compact roll press.
Description
ROLL PRESS
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a roll press of a machine, e.g., a paper making machine, including a suction press roll that lifts a material web, e.g., cardboard or paper, from a screen or similar surface having an associated press felt guided around the suction press roll, and having a pay-out press roll that takes the material web from the suction press roll and forms a press gap with the suction press roll. The pay-out press roll pays out the material web to a subsequent part of the machine.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a roll press of a machine, e.g., a paper making machine, including a suction press roll that lifts a material web, e.g., cardboard or paper, from a screen or similar surface having an associated press felt guided around the suction press roll, and having a pay-out press roll that takes the material web from the suction press roll and forms a press gap with the suction press roll. The pay-out press roll pays out the material web to a subsequent part of the machine.
2. Discussion of the Background Information A roll press similar to the one generally described above is used in particular for dewatering a material web being processed. The dewatering capacity achieved by such a roll press is, among other things, dependent on the number of press gaps. However, there are practical limits to increasing the number of press gaps associated with the roll press. For this reason, the prior art has been proposed positioning at least one other separate pair of rolls after the pair of rolls formed by the suction press roll and the pay-out press roll to form an additional roll gap. Practical considerations, such as space required for house this arrangement, are considerable. The open tensions produced between the respective pairs of rolls are also problematic.
SUMMARY OF THE INVENTION
The present invention is directed towards the provision of a roll press, as described above, which ensures greater pressing capacity, i.e. a higher dewatering capacity, with a minimal space requirement than the roll presses of the prior art.
In accordance with an aspect of the present invention, there is provided a roll press of a machine for producing a material web comprising:
a suction press roll;
a press felt associated with, and guided around at least a portion of the suction roll;
the suction roll lifting the material web from a screen;
a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll;
a first additional press roll forming a first additional press gap with the suction press roll;
a first addition press felt, associated with the first additional press roll, passing through the first additional press gap;
a second additional press roll forming a second additional press gap with the pay-out press roll;
a second additional press felt, associated with the second additional press roll, passing through the second additional press gap;
at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
In accordance with another aspect of the present invention, there is provided a roll press for a continuous material web producing machine comprising:
a first press roll;
a second press roll;
a third press roll;
a fourth press roll;
said first, second, third, and fourth press rolls arranged to form a first, second, and third press gap;
said first press roll positioned to lift the material web off a screen;
said second press roll positioned adjacent said first press roll to form said second press gap and to transfer the material web to said second press roll;
said second press rolls forming a part of each of said second and third press gaps;
said first press gap comprising a two-sided dewatering gap; and said second and third press gaps comprising one-sided dewatering gaps According to the invention, therefore, each of the suction press roll and the pay-out press roll is associated with at least one additional press roll to form respective additional press gaps. A press felt may be guided by each additional press roll, and at least one of the respective additional press gaps formed may be elongated in the travel direction of the material web.
The preferred embodiment of the present invention produces an extremely compact roll press with a high pressing capacity. In simplest embodiment of the present invention, a roll apparatus may be produced including three press gaps and four rolls. This embodiment may perform dewatering on both sides of the web in the region of the first press gap, e.g., between the suction press - 2a -roll and the associated additional press roll; on at least one side of the web in the region of a second press gap, e.g., between the suction press roll and the pay-out press roll; and on at least one side of the web in the region of a third press gap, e.g., between the pay-out press roll and the associated additional press roll.
Further, from a takeover point on a screen end to a pay-out point, a closed - 2b -~~0~66~
P15457.502 web guidance may be produced which has preliminary dewatering of the cardboard or paper web. Because rewetting may be kept to a minimum, a maximal dry content can be achieved. Because there are no open tensions between the rolls, stretching of the paper may be substantially eliminated. Further, in accordance with the present invention, no losses in wet strength may occur.
According to the present invention, the first open tension may occur only in connection with the press device when the web has attained a substantially maximal wet strength.
Thus, a crucial advantage of the present invention over the prior art is that, due to the at least one elongated additional press gap, a considerably higher pressing capacity or dewatering capacity may be achieved despite the extremely compact nature of the roll apparatus.
In this connection, it may be particularly advantageous to arrange at least the additional press gap formed between the pay-out press roll and the associated additional press roll as an elongated press gap.
In an alternative embodiment of the roll press according to the present invention, the suction press roll may rest against or abut the screen through the associated press felt to lift off the material web. As a result, the lift off of the material web from the screen may be appreciably simplified to the simplest of designs.
Advantageously, at least one of the additional press rolls may be a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one hydrostatic and/or hydrodynamic support element supporting the roll jacket on the core.
SUMMARY OF THE INVENTION
The present invention is directed towards the provision of a roll press, as described above, which ensures greater pressing capacity, i.e. a higher dewatering capacity, with a minimal space requirement than the roll presses of the prior art.
In accordance with an aspect of the present invention, there is provided a roll press of a machine for producing a material web comprising:
a suction press roll;
a press felt associated with, and guided around at least a portion of the suction roll;
the suction roll lifting the material web from a screen;
a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll;
a first additional press roll forming a first additional press gap with the suction press roll;
a first addition press felt, associated with the first additional press roll, passing through the first additional press gap;
a second additional press roll forming a second additional press gap with the pay-out press roll;
a second additional press felt, associated with the second additional press roll, passing through the second additional press gap;
at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
In accordance with another aspect of the present invention, there is provided a roll press for a continuous material web producing machine comprising:
a first press roll;
a second press roll;
a third press roll;
a fourth press roll;
said first, second, third, and fourth press rolls arranged to form a first, second, and third press gap;
said first press roll positioned to lift the material web off a screen;
said second press roll positioned adjacent said first press roll to form said second press gap and to transfer the material web to said second press roll;
said second press rolls forming a part of each of said second and third press gaps;
said first press gap comprising a two-sided dewatering gap; and said second and third press gaps comprising one-sided dewatering gaps According to the invention, therefore, each of the suction press roll and the pay-out press roll is associated with at least one additional press roll to form respective additional press gaps. A press felt may be guided by each additional press roll, and at least one of the respective additional press gaps formed may be elongated in the travel direction of the material web.
The preferred embodiment of the present invention produces an extremely compact roll press with a high pressing capacity. In simplest embodiment of the present invention, a roll apparatus may be produced including three press gaps and four rolls. This embodiment may perform dewatering on both sides of the web in the region of the first press gap, e.g., between the suction press - 2a -roll and the associated additional press roll; on at least one side of the web in the region of a second press gap, e.g., between the suction press roll and the pay-out press roll; and on at least one side of the web in the region of a third press gap, e.g., between the pay-out press roll and the associated additional press roll.
Further, from a takeover point on a screen end to a pay-out point, a closed - 2b -~~0~66~
P15457.502 web guidance may be produced which has preliminary dewatering of the cardboard or paper web. Because rewetting may be kept to a minimum, a maximal dry content can be achieved. Because there are no open tensions between the rolls, stretching of the paper may be substantially eliminated. Further, in accordance with the present invention, no losses in wet strength may occur.
According to the present invention, the first open tension may occur only in connection with the press device when the web has attained a substantially maximal wet strength.
Thus, a crucial advantage of the present invention over the prior art is that, due to the at least one elongated additional press gap, a considerably higher pressing capacity or dewatering capacity may be achieved despite the extremely compact nature of the roll apparatus.
In this connection, it may be particularly advantageous to arrange at least the additional press gap formed between the pay-out press roll and the associated additional press roll as an elongated press gap.
In an alternative embodiment of the roll press according to the present invention, the suction press roll may rest against or abut the screen through the associated press felt to lift off the material web. As a result, the lift off of the material web from the screen may be appreciably simplified to the simplest of designs.
Advantageously, at least one of the additional press rolls may be a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one hydrostatic and/or hydrodynamic support element supporting the roll jacket on the core.
~~a ~ss~
P15457.502 In a preferred embodiment, the suction press roll, the pay-out press roll, and the additional press rolls may be positioned and/or supported to cancel out the forces of the press gaps, and, thus, need not be absorbed by the machine foundation and/or an external seating. Thus, the external seating may be optionally included.
A preferred embodiment of the present invention provides that the pay-out press roll may be associated with at least one additional press roll that may include a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element. The deflection compensation roll and the pay-out press roll may form an elongated press gap elongated in the travel direction of the material web.
Due to the elongated press gap formed between the pay-out press roll and the associated additional press roll, optimum dewatering capacity is achieved while maintaining a compact roll apparatus comprised of a small number of rolls.
Preferably, the suction press roll may be associated with at least one additional press roll that includes a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element. The deflection compensation roll and the suction press roll forming an elongated press gap elongated in the travel direction of the material web. The elongated press gap further optimizing the dewatering capacity.
The pay-out press roll may advantageously be formed by P15457.502 a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one hydrostatic and/or hydrodynamic support element supporting the roll jacket on the core. Preferably, a deflection compensation roll type pay-out press roll has a rigid roll jacket. However, such a pay-out press roll may alternatively include a flexible jacket.
The roll jacket of a deflection compensation roll type pay-out press roll may be radially fixed on its ends, at least during operation. Accordingly, radial movements of the pay-out press roll during operation may be substantially prevented, which, consequently, maintains the respective positioning of the rolls even when the press is loaded.
The deflection compensation roll type pay-out press roll may alternatively be associated with at least one additional press roll that likewise includes a deflection compensation roll. According to this embodiment, the hydraulically actuated hydrostatic and/or hydrodynamic support elements of each of the additional press roll and the pay-out press roll may be hydraulically coupled to each other. This embodiment may be advantageous, for example, in connection with a position regulation.
To achieve the most defined conditions possible, the pay-out press roll may be fixed to a stanchion or upright support beam in a predetermined position, e.g., without the possibility of a radial deflection. The stanchion may be mounted to the machine foundation in a stationary fashion.
The pay-out press roll may include a deflection compensation roll having a flexible roll jacket, a core P15457.502 passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element.
The deflection compensation roll and at least one of the associated additional press roll and suction press roll may form an elongated press gap elongated in the travel direction of the material web.
Furthermore, if the additional press roll, associated with the deflection compensation roll type pay-out press roll, includes a deflection compensation roll having a flexible roll jacket, then the support elements of each of the pay-out press roll and the associated press roll may be at least substantially smooth on their sides oriented toward their respective roll jacket to form a press gap that is at least substantially smooth.
In accordance with the present invention, at least one of the rolls may include a deflection compensation roll having a roll jacket that may be movable in the radial direction. In this instance, the roll jacket is preferably rigid, although, the present invention also contemplates utilizing a flexible roll jacket in an alternative embodiment.
Accordingly, to produce the most defined conditions possible during operation, at least the press gap formed between the pay-out press roll and the associated additional press roll may be suitably fixed in a predetermined position by a corresponding position regulation.
The suction press roll may be a hollow roll having a roll jacket supported on its interior and rotatable around a core. In this instance, the suction press roll may P15457.502 preferably be provided with an external suction box that suctions off a region disposed inside the roll.
The present invention may be directed to a roll press of a machine for producing a material web. The roll press may include a suction press roll; a press felt associated with, and guided around, at least a portion of the suction roll; the suction roll lifting the material web from a screen; and a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll. The roll press may also include a first additional press roll forming a first additional press gap with the suction press roll; a first additional press felt, associated with the first additional press roll, passing through the first additional press gap; a second additional press roll forming a second additional press gap with the pay-out press roll; a second additional press felt, associated with the second additional press roll, passing through the second additional press gap; and at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
In accordance with another feature of the present invention, the roll press may also include a felt changing retraction device for changing at least one of the press felt, and the first and second additional press felts.
In accordance with still another feature of the present invention, the roll press may also include a cantilever carrier carrying the press felt in a cantilevered manner to facilitate replacing the press felt.
_ 7 _ P15457.S02 In accordance with a further feature of the present invention, the roll press may also include a support device for adjustably positioning the second additional press roll for facilitating changing the second additional press felt for the second additional press roll. The support device may include a coupling device to couple a core of the second additional press roll to the support device.
In accordance with a still further feature of the present invention, the roll press may also include a support device for adjustably positioning the suction press roll for facilitating changing the first additional press felt. The support device may include a coupling device to couple a core of the second additional press roll to the support device, the core comprising a slip-mounted pipe.
The present invention may also be directed to a roll press for a continuous material web producing machine. The roll press may include a first press roll, a second press roll, a third press roll, and a fourth press roll. The first, second, third, and fourth press rolls may be arranged to form a first, second, and third press gap. The first press roll may be positioned to lift the material web off a screen, the second press roll may be positioned adjacent the first press roll to form the second press gap and to transfer the material web to the second press roll, and the second press roll forming a part of each of the second and third press gaps. The first press gap may include a two-sided dewatering gap and the second and third press gaps may each include one-sided dewatering gaps.
In accordance with another feature of the present g _ P15457.502 invention, at least one of the second, third and fourth press rolls may include a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a part of at least one of the first, second, and third press gaps.
In accordance with another feature of the present invention, each of the second, third and fourth press rolls may include a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a respective part of the first, second, and third press gap.
In accordance with a further feature of the present invention, the support elements may include non-convex support surfaces.
In accordance with a still further feature of the present invention, the second and third press rolls may include support elements having complementary support surfaces for forming the third press gap. The third press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with still another feature of the present invention, the second press roll may include support elements having a support surface complementary to an outer circumference of the first press roll for forming the second press gap. The second press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with a still further feature of the present invention, the fourth press roll may include support elements having a support surface complementary to P15457.502 an outer circumference of the first press roll for forming the first press gap. The first press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with another feature of the present invention, each of the first, second, third, and fourth press rolls may include a respective first, second, third, and fourth longitudinal axis, and the first, second, and third longitudinal axis may be collinearly arranged to form a roll line at a predetermined angle from a vertical reference. Further, the fourth press roll may be arranged adjacent the first press roll such that a connecting line connecting the first and fourth longitudinal axis is substantially perpendicular to the roll line.
In accordance with still another feature of the present invention, each of the first, second, third, and fourth press rolls may include a respective first, second, third, and fourth longitudinal axis. The first and second press roll may be arranged such that a line connecting the first and second longitudinal axes may be at a predetermined angle from a vertical reference. The third press roll may be positioned adjacent the second press roll such that a line formed through the second and third longitudinal axes may be substantially parallel to the vertical reference. The fourth roll may be positioned adjacent the first roll such that a line connecting the first and fourth longitudinal axes may be substantially perpendicular to the predetermined angle.
In accordance with yet another feature of the present invention, the first roll may include a suction press roll.
P15457.S02 Other advantageous embodiments and features of the present invention may be ascertained by reviewing the following detailed description of the present invention and the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is further described in the detailed description which follows, in reference to the noted drawings by way of non-limiting examples of preferred embodiments of the present invention, and wherein:
Figure 1 illustrates a simplified schematic partial view of a first embodiment of a roll press according to the present invention;
Figure 2 illustrates a simplified schematic view of an alternative embodiment of the roll press according to the present invention;
Figure 3 illustrates a partial view of the roll press depicted in Figure 2 with force lines being indicated in the gap regions;
Figure 4 illustrates the roll press depicted in Figure 2 during a phase in which the press felt for the suction press roll is,being changed;
Figure 5 illustrates the roll press depicted in Fig.
2 during a phase in which the press felt for the additional press roll associated with the pay-out press roll is being changed; and Figure 6 illustrates the roll press depicted in Fig.
~2 during a phase in which the press felt for the additional press roll associated with the suction press roll is being changed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
P15457.S02 The particulars shown herein are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
Figure 1 illustrates a simplified schematic representation of a roll press of a machine, e.g., a paper making machine. The roll press may include a suction press roll 4 that takes or lifts off a material web A, e.g., cardboard or paper, from a screen 1 and transfers material web A to an associated press felt 6. Press felt 6 may be guided around suction press roll 4 to carry the material web Around suction press roll 4 with the aid of vacuum 8.
The roll press may also include a pay-out press roll 7 arranged to form a press gap with adjacent suction press roll 4 through which press felt 6 and material web A.
After passing through press gap B, material web A is transferred to, or taken by, pay-out press roll 7 to pay out material web A to a subsequent part of the machine.
As shown, e.g., in Figure 1, suction press roll 4 may abut or rests against screen 1 through press felt 6. Thus, material web A may be directly transferred to press felt 6 with the assistance of suction press roll 4 and vacuum 8.
P15457.502 Both suction press roll 4 and pay-out press roll 7 may be associated with an additional press roll, e.g., additional press rolls 14 and 24, respectively. Further, each of the additional press rolls 14 and 24 may be associated with a press felt 15 and 25, respectively.
Suction press roll 4 may be arranged adjacent additional press roll 14 to form a press gap R, through which, press felt 6 and press felt 15 may pass. Further, material web A may also pass through press gap R sandwiched between press felt 6 and press felt 15. Pay-out press roll 7 may be arranged adjacent additional press roll 24 to form press gap S, through which, press felt 25 may pass. Further, material web A may also pass through press gap S sandwiched between pay-out press roll 7 and press felt 25.
Screen 1 may be part of a screen section of the machine which may further include screen rolls 2 and 3 for guiding screen 1. As shown, suction press roll 4 preferably abuts screen 1, i.e., through press felt 6, in a region formed between screen rolls 2 and 3.
Material web A, which may be lifted off screen 1 by the press felt 6 and suction press roll 4, may be successively guided through press gaps R, B and S. Because material web A is sandwiched between press felts 6 and 15 within press gap R, two-sided dewatering of material web A
occurs in press gap R due to the respective pressing of the press felts 6 and 15 by suction press roll 4 and additional press roll 14. Because material web A is sandwiched between press felt 6 and pay-out press roll 7 within press gap B, only one-sided dewatering occurs in press gap B due to a suction effect via vacuum 8 through suction press roll P15457.502 4. Because material web A is sandwiched between pay-out press roll 7 and press felt 25 within press gap S, one-sided dewatering occurs in press gap S due to press felt 25 associated with additional press roll 24.
In the first embodiment represented in Fig. 1, suction press roll 4 may be comprised of a hollow roll having a rigid roll jacket 30. Rigid roll jacket 30 may be supported on its interior by, and rotatable around, a core 32.
Suction press roll 4 may be provided with an external suction box 34 to suction off a region 36 located within rigid roll jacket 30.
Each of press gaps R and S may be formed as elongated press gaps elongated in travel direction of material web A.
Further, press gap B may also be formed as an elongated press gap elongated in the travel direction of material web A.
Additional press rolls 14 and 24 and pay-out press roll 7 may be comprised of deflection compensation rolls having a circumferential roll jacket 17, 26, and 38, respectively, a core 16 extending longitudinally through each of the circumferential roll jackets, and at least one hydrostatic and/or hydrodynamic support element 18, 27, 27' and 40, respectively, supporting the respective roll jacket 17, 26, and 38 on core 16 within each respective press gap region. As shown in Figure 1, roll jacket 38 may include support elements associated with more than one press gap.
For example, roll jacket 38 may be supported in the region of press gap S with at least one hydrostatic and or hydrodynamic support element 27' positioned adjacent to P15457.S02 support element 27 of additional press roll 24, and in the region of press gap B with at least one hydrostatic and/or hydrodynamic support element 40 positioned adjacent to suction press roll 4.
In the preferred embodiment of the present invention, roll jackets 26 and 38 may be made of a flexible material.
Because adjacent support elements 27 and 27' are positioned to support roll jackets 26 and 38, respectively, and to form an elongated press gap, i.e., press gap S, the press surfaces of support elements 27 and 27' should be complementary. Thus, in a preferred embodiment of the present invention, hydrostatic and/or hydrodynamic support elements 27 and 27' may include substantially planar press surfaces for forming the elongated press gap S. However, it is also contemplated that support elements 27 and 27' may be formed by complementary concave and convex press surfaces to ensure formation of a press gap S that is elongated in the travel direction of the material web A.
Hydrostatic and or hydrodynamic support elements 40, also associated with pay-out press roll 7 to support roll jacket 38 and form an elongated press gap, i.e., press gap B, may include a press surface that is complementary to an outer surface of suction press roll 4. Thus, in accordance with the preferred embodiment of the present invention, the press surface of support element 40 may be concave with a curvature to complement the outer curvature of rigid roll jacket 30. Thus, flexible roll jacket 38 may be pressed against rigid roll jacket 30 to form press gap B, which is elongated in the travel direction of the material web A.
Hydrostatic and/or hydrodynamic support elements 18, P15457.502 which support roll jacket 17 and form an elongated press gap, i.e., press gap R, may include a press surface that is complementary to an outer surface of suction press roll 4.
Thus, in accordance with the preferred embodiment of the present invention, the press surface of support element 18 may be concave with a curvature to complement the outer curvature of rigid roll jacket 30. Thus, flexible roll jacket 17 may be pressed against rigid roll jacket 30 to form press gap R, which is elongated in the travel direction of the material web A. Further, press gap R may extend over the larger portion of the outer circumference of suction press roll 4 than press gap B. Thus, the concave press surface of support element 18 may be longer than the concave press surface of support element 40.
The roll jacket of additional press roll 24 may also include recesses for receiving press water. The recesses may be formed, e.g., as circumferential grooves and/or blind bores.
Cores 16 may be substantially stationary, at least during operation. Further, pay-out press roll 7 may be provided with a roll jacket that may be radially fixed in place at its ends, at least during operation.
As shown in Figure 1, axes of each of suction press roll 4, pay-out press roll 7, and additional press roll 24 may be substantially collinearly arranged to form a line positioned at a predetermined angle from a vertical reference line, e.g., perpendicular to a base of the machine. In accordance with the preferred embodiment, the line formed by the collinear arrangement of the rolls may be positioned, e.g., at approximately 45° with respect to P15457.S02 the vertical reference. Further, in accordance with the preferred embodiment, additional press roll 14 may be located below suction press roll 4 such that a straight line extending through the axes of suction press roll 4 and additional press roll 14 substantially forms a right angle with the line formed by the collinear arrangement of the rolls.
In an alternative embodiment illustrated in Figure 2, additional press roll 24 may rotated out of collinear arrangement of Figure 1 to be located directly above pay out press roll 7, with respect to a machine foundation 44.
Thus, a straight line extending through the axes of pay-out press roll 7 and additional press roll 24 may be substantially vertical with respect to machine foundation 44. Generally, in all other respects the roll press illustrated in Figure 2 is substantially similar to the roll press depicted in Figure 1, thus, same reference numerals have bee associated to similar elements.
Therefore, in accordance with the respective seating of the rolls as shown in the alternative embodiment of Figure 2, pay-out press roll 7 may be fixed in a defined position, i.e., substantially without any radial deflection, on a stanchion (upright support beam) 42 which may be fixedly mounted fixed on machine foundation 44.
At least during operation of the roll press, the jacket of pay-out press roll 7 may be substantially radially fixed at its ends to maintain a substantially unchanged position even under a pressure load.
A position adjustment may be utilized to ensure that press gap S remains in its preset position. Thus, press P15457.S02 gap S is held in position independently of the respective pressure force and the respective machine speed. At least one position sensor and at least one pressure force regulating device may be provided for at least one of the respective support elements.
As illustrated in Figures 2 and 3, during operation of the roll press, press rolls 4, 7, 14 and 24 forming the three press gaps may be supported against each other and/or connected to each other, with regard to forces, such that practically no pressing forces need to be absorbed by other seating elements. That is, the pressing forces may be absorbed by the associated bearing parts supporting the roll journals or the roll cores.
The respective courses of the force flow, illustrated in bold lines (solid and dashed) in Figure 3, may result in the region of the three press gaps. Accordingly, force lines closed in themselves result above the respective press gaps, which leads to the fact that the pressing forces which, as a rule, are relatively high, only need to be absorbed by the associated bearing elements supporting the roll journals or the cores. That is, the force lines associated with gap R, gap B, and gap S run through the centers of the respective bearings and through the respective centers of the press gaps. Therefore, additional bearing elements need not be laid out for these high pressing forces.
The roll press of the present invention may include connecting elements provided between the bearing places to releasably couple the rolls together. Further, the rolls may be released, e.g., to enable changing the rolls or P15457.S02 coverings.
The roll press in Figure 2 may be illustrated, e.g., during a phase in which press felt 6 is being changed, as shown in Figure 4. Figure 4 shows suction press roll 4 in a released state, i.e., not abutting screen 1, additional press roll 14, and pay-out press roll 7 through press felt 6. Press felt 6 may be freely supported by a cantilever carrier 46 on the guide or operator side, and it may be supported on the drive side. To loosen press felt 6 for changing, intermediate pieces 48 (associated with suction press roll 4 and shown in Figure 2) may be removed, e.g., by lifting the bearing arrangement located above it with a crane.
In accordance with Figure 4, press felt 6, which was clamped on a deflection roll 50 as shown in Figure 2, may be partially wound onto a roll 52.
Figure 5 shows the roll press of Fig. 2 during a phase in which press felt 25 is being changed. Prior to changing press felt 25, intermediate pieces 48 (associated with additional press roll 24 and shown in Figure 2) may be removed.
To change press felt 25, the connecting elements of additional press roll 24 and pay-out press roll 7 and the seating elements on the guide side may be released.
Thereafter, additional press roll 24 may be lifted by a support device fastened on its core, around which the felt had previously been draped.
In accordance with Figure 5, press felt 25, which was previously clamped on a deflection roll 54, as shown in Figure 2, and which is now being change, may be partially P15457.S02 wound onto a roll 56.
The frame seating may be exclusively provided for supporting the felt running devices and for receiving the inherent weight of the pressing installations. Thus, the frame seating is not used to absorb pressing forces exerted on the material web.
The frame seating may be integrated into a forming and screen section disposed upstream, with respect to the travel direction of the material web. For performing a screen change, appropriate interrupting devices may be provided on the guide side. In this case, the frame seating may be supported on the guide side by the cantilever carrier of suction press roll 4.
In accordance with the present invention, the entire pressing arrangement may not include seating elements on machine foundation 44 in front of the machine. That is, the machine may be free of such seating elements in front of the machine girder on the guide side, on which the frame stanchion and the stanchion of the pay-out press roll are supported.
In accordance with Figure 6, when changing press felt 15, after releasing the connecting elements on the guide side, additional press roll 14 may be lowered by a support device fastened on the core of the press roll 14, around which the new felt had been previously draped. The support device may be, e.g., a push-on tube.
The roll press can have a crane rail for a respective roll change, which extends transversely with respect to the paper machine and may perform various functions. For example, crane rail 58 (Figure 3) may be intended for use P15457.S02 as an extension aid for supporting the end of suction press roll 4 on the drive side. It may also be used as an insertion aid for supporting the end of the felt insertion device on the drive side for press felt 6 associated with suction press roll 4. It may also be used as an insertion aid for supporting the end of the felt insertion device on the drive side for press felt 25, which may be guided around additional press roll 24.
The roll press, in accordance with the features of the present invention, has the advantage that a closed web guide results from a pick-up place at a screen side of the machine to an end of the roll press. Overall, not much re wetting is permitted, which ensures the highest degree of dry content for the material web. Because there are no open sections inside the press, no stretching of the paper and no loss of wet strength occurs. The first open section may be located downstream of the roll press at maximum wet strength. The highest degree of wet strength may be ensured because only one transfer point downstream of the press section is provided.
Even with a production width variation, it may be possible to always ensure a constant paper width through each press gaps or nips. A variable edge strip may run off a central roll. It is also important that the press felts and press rolls may always be operated with the same paper width. The desired high dry content may be achieved, e.g., with.only one press, which results in a reduced number of rolls.
Further, an extremely compact structure or construction of the roll press is available. Thus, in P15457.S02 addition to space savings, the present invention may be essential, e.g., for problem-free retrofitting of replacement components.
Because direct force flow may be provided for all press gaps or nips, portal seating may be omitted and no stanchions are provided on the outside of the drive side.
Accordingly, more free space may be created in front of the machine and there is no load on the cover.
Furthermore, good access may be provided by bridge seating. A respective felt or roll change may be possible without problems. Further, improved accessibility may be provided for adjustment, maintenance and cleaning operations.
Due to the lack of a transverse support above the press, an optimal nip arrangement, e.g., in the form of a four-roll Nipco-Flex combination press, may be provided.
A stationary path run geometry downstream of the press may result in a stationary driven central press roll (Nico-P-roll) after the press roll has been mounted on a stanchion. Furthermore, a locally stable scraper embodiment may be utilized. Due to the specific arrangement of the present invention, the roll press may also be insensible to drive oscillations.
Further, a high degree of operational dependability may result for a respective shoe press in an installment position, such as that provided by the present invention.
The clotting danger may be reduced to a minimum by a closed web removal. Manual application (e. g., by a glass tube) may be omitted, the same as the two nips for pre calibration. Optimal press jacket lubrication may be P15457.S02 utilized in the event of an inverted shoe arrangement.
A relatively simple press roll change may be possible in spite of the compact construction. The press rolls may be changed (or replaced) independently of each other with little expenditure of time. Extension devices may be provided for each press roll, which reduces the time necessary of operating the crane to a minimum. However, a roll change may be basically possible without a crane, e.g., by rails located in front of the machine.
Press felt 6 associated with suction press roll 4 may be fully cantilevered. That is, the felt can be changed without problems by rails located in front of the machine.
Alternatively, press felt 6 associated with suction press roll 4 may be fully cantilevered. That is, the felt may be changed without problems by a felt change insertion device.
The upper felt may be portable by a press jacket changing device. Again, a felt change insertion device may be utilized. Further, the lower felt may be portable (e. g., push-on tube on a Nipco core). Extensible felt guide rolls located on the inside may be utilized.
In addition, improved accessibility for Scanpro measurements may be achieved.
Finally, a cost-effective overall roll press concept may be contemplated. For example, since a separate Nipco Flex press is not necessarily provided in the construction of the present invention, only a few reserve rolls may be required. Further, a very small construction cost portion may also result from the reduced space requirements.
It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in f P15457.502 no way to be construed as limiting of the present invention. While the invention has been described with reference to a preferred embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the invention in its aspects. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein; rather, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.
P15457.502 Reference Numeral List 1 screen 2 screen roll 3 screen roll 4 suction press roll 6 press felt 7 pay-out press roll 8 vacuum 14 additional press roll 15 press felt 16 core 17 roll jacket 18 support element 24 additional press roll 25 press felt 26 roll jacket 27 support element 27' support element 30 roll jacket 32 core 34 suction box 36 region 38 roll jacket 40 support element 42 stanchion 44 machine foundation 46 cantilever carrier 48 intermediary pieces 50 deflection roll 52 roll P15457.502 54 deflection roll 56 roll A paper web B press gap R additional press gap S additional press gap
P15457.502 In a preferred embodiment, the suction press roll, the pay-out press roll, and the additional press rolls may be positioned and/or supported to cancel out the forces of the press gaps, and, thus, need not be absorbed by the machine foundation and/or an external seating. Thus, the external seating may be optionally included.
A preferred embodiment of the present invention provides that the pay-out press roll may be associated with at least one additional press roll that may include a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element. The deflection compensation roll and the pay-out press roll may form an elongated press gap elongated in the travel direction of the material web.
Due to the elongated press gap formed between the pay-out press roll and the associated additional press roll, optimum dewatering capacity is achieved while maintaining a compact roll apparatus comprised of a small number of rolls.
Preferably, the suction press roll may be associated with at least one additional press roll that includes a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element. The deflection compensation roll and the suction press roll forming an elongated press gap elongated in the travel direction of the material web. The elongated press gap further optimizing the dewatering capacity.
The pay-out press roll may advantageously be formed by P15457.502 a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one hydrostatic and/or hydrodynamic support element supporting the roll jacket on the core. Preferably, a deflection compensation roll type pay-out press roll has a rigid roll jacket. However, such a pay-out press roll may alternatively include a flexible jacket.
The roll jacket of a deflection compensation roll type pay-out press roll may be radially fixed on its ends, at least during operation. Accordingly, radial movements of the pay-out press roll during operation may be substantially prevented, which, consequently, maintains the respective positioning of the rolls even when the press is loaded.
The deflection compensation roll type pay-out press roll may alternatively be associated with at least one additional press roll that likewise includes a deflection compensation roll. According to this embodiment, the hydraulically actuated hydrostatic and/or hydrodynamic support elements of each of the additional press roll and the pay-out press roll may be hydraulically coupled to each other. This embodiment may be advantageous, for example, in connection with a position regulation.
To achieve the most defined conditions possible, the pay-out press roll may be fixed to a stanchion or upright support beam in a predetermined position, e.g., without the possibility of a radial deflection. The stanchion may be mounted to the machine foundation in a stationary fashion.
The pay-out press roll may include a deflection compensation roll having a flexible roll jacket, a core P15457.502 passing through the flexible roll jacket, and at least one non-convex hydrostatic and/or hydrodynamic support element.
The deflection compensation roll and at least one of the associated additional press roll and suction press roll may form an elongated press gap elongated in the travel direction of the material web.
Furthermore, if the additional press roll, associated with the deflection compensation roll type pay-out press roll, includes a deflection compensation roll having a flexible roll jacket, then the support elements of each of the pay-out press roll and the associated press roll may be at least substantially smooth on their sides oriented toward their respective roll jacket to form a press gap that is at least substantially smooth.
In accordance with the present invention, at least one of the rolls may include a deflection compensation roll having a roll jacket that may be movable in the radial direction. In this instance, the roll jacket is preferably rigid, although, the present invention also contemplates utilizing a flexible roll jacket in an alternative embodiment.
Accordingly, to produce the most defined conditions possible during operation, at least the press gap formed between the pay-out press roll and the associated additional press roll may be suitably fixed in a predetermined position by a corresponding position regulation.
The suction press roll may be a hollow roll having a roll jacket supported on its interior and rotatable around a core. In this instance, the suction press roll may P15457.502 preferably be provided with an external suction box that suctions off a region disposed inside the roll.
The present invention may be directed to a roll press of a machine for producing a material web. The roll press may include a suction press roll; a press felt associated with, and guided around, at least a portion of the suction roll; the suction roll lifting the material web from a screen; and a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll. The roll press may also include a first additional press roll forming a first additional press gap with the suction press roll; a first additional press felt, associated with the first additional press roll, passing through the first additional press gap; a second additional press roll forming a second additional press gap with the pay-out press roll; a second additional press felt, associated with the second additional press roll, passing through the second additional press gap; and at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
In accordance with another feature of the present invention, the roll press may also include a felt changing retraction device for changing at least one of the press felt, and the first and second additional press felts.
In accordance with still another feature of the present invention, the roll press may also include a cantilever carrier carrying the press felt in a cantilevered manner to facilitate replacing the press felt.
_ 7 _ P15457.S02 In accordance with a further feature of the present invention, the roll press may also include a support device for adjustably positioning the second additional press roll for facilitating changing the second additional press felt for the second additional press roll. The support device may include a coupling device to couple a core of the second additional press roll to the support device.
In accordance with a still further feature of the present invention, the roll press may also include a support device for adjustably positioning the suction press roll for facilitating changing the first additional press felt. The support device may include a coupling device to couple a core of the second additional press roll to the support device, the core comprising a slip-mounted pipe.
The present invention may also be directed to a roll press for a continuous material web producing machine. The roll press may include a first press roll, a second press roll, a third press roll, and a fourth press roll. The first, second, third, and fourth press rolls may be arranged to form a first, second, and third press gap. The first press roll may be positioned to lift the material web off a screen, the second press roll may be positioned adjacent the first press roll to form the second press gap and to transfer the material web to the second press roll, and the second press roll forming a part of each of the second and third press gaps. The first press gap may include a two-sided dewatering gap and the second and third press gaps may each include one-sided dewatering gaps.
In accordance with another feature of the present g _ P15457.502 invention, at least one of the second, third and fourth press rolls may include a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a part of at least one of the first, second, and third press gaps.
In accordance with another feature of the present invention, each of the second, third and fourth press rolls may include a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a respective part of the first, second, and third press gap.
In accordance with a further feature of the present invention, the support elements may include non-convex support surfaces.
In accordance with a still further feature of the present invention, the second and third press rolls may include support elements having complementary support surfaces for forming the third press gap. The third press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with still another feature of the present invention, the second press roll may include support elements having a support surface complementary to an outer circumference of the first press roll for forming the second press gap. The second press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with a still further feature of the present invention, the fourth press roll may include support elements having a support surface complementary to P15457.502 an outer circumference of the first press roll for forming the first press gap. The first press gap may include an elongated press gap elongated in a travel direction of the material web.
In accordance with another feature of the present invention, each of the first, second, third, and fourth press rolls may include a respective first, second, third, and fourth longitudinal axis, and the first, second, and third longitudinal axis may be collinearly arranged to form a roll line at a predetermined angle from a vertical reference. Further, the fourth press roll may be arranged adjacent the first press roll such that a connecting line connecting the first and fourth longitudinal axis is substantially perpendicular to the roll line.
In accordance with still another feature of the present invention, each of the first, second, third, and fourth press rolls may include a respective first, second, third, and fourth longitudinal axis. The first and second press roll may be arranged such that a line connecting the first and second longitudinal axes may be at a predetermined angle from a vertical reference. The third press roll may be positioned adjacent the second press roll such that a line formed through the second and third longitudinal axes may be substantially parallel to the vertical reference. The fourth roll may be positioned adjacent the first roll such that a line connecting the first and fourth longitudinal axes may be substantially perpendicular to the predetermined angle.
In accordance with yet another feature of the present invention, the first roll may include a suction press roll.
P15457.S02 Other advantageous embodiments and features of the present invention may be ascertained by reviewing the following detailed description of the present invention and the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is further described in the detailed description which follows, in reference to the noted drawings by way of non-limiting examples of preferred embodiments of the present invention, and wherein:
Figure 1 illustrates a simplified schematic partial view of a first embodiment of a roll press according to the present invention;
Figure 2 illustrates a simplified schematic view of an alternative embodiment of the roll press according to the present invention;
Figure 3 illustrates a partial view of the roll press depicted in Figure 2 with force lines being indicated in the gap regions;
Figure 4 illustrates the roll press depicted in Figure 2 during a phase in which the press felt for the suction press roll is,being changed;
Figure 5 illustrates the roll press depicted in Fig.
2 during a phase in which the press felt for the additional press roll associated with the pay-out press roll is being changed; and Figure 6 illustrates the roll press depicted in Fig.
~2 during a phase in which the press felt for the additional press roll associated with the suction press roll is being changed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
P15457.S02 The particulars shown herein are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
Figure 1 illustrates a simplified schematic representation of a roll press of a machine, e.g., a paper making machine. The roll press may include a suction press roll 4 that takes or lifts off a material web A, e.g., cardboard or paper, from a screen 1 and transfers material web A to an associated press felt 6. Press felt 6 may be guided around suction press roll 4 to carry the material web Around suction press roll 4 with the aid of vacuum 8.
The roll press may also include a pay-out press roll 7 arranged to form a press gap with adjacent suction press roll 4 through which press felt 6 and material web A.
After passing through press gap B, material web A is transferred to, or taken by, pay-out press roll 7 to pay out material web A to a subsequent part of the machine.
As shown, e.g., in Figure 1, suction press roll 4 may abut or rests against screen 1 through press felt 6. Thus, material web A may be directly transferred to press felt 6 with the assistance of suction press roll 4 and vacuum 8.
P15457.502 Both suction press roll 4 and pay-out press roll 7 may be associated with an additional press roll, e.g., additional press rolls 14 and 24, respectively. Further, each of the additional press rolls 14 and 24 may be associated with a press felt 15 and 25, respectively.
Suction press roll 4 may be arranged adjacent additional press roll 14 to form a press gap R, through which, press felt 6 and press felt 15 may pass. Further, material web A may also pass through press gap R sandwiched between press felt 6 and press felt 15. Pay-out press roll 7 may be arranged adjacent additional press roll 24 to form press gap S, through which, press felt 25 may pass. Further, material web A may also pass through press gap S sandwiched between pay-out press roll 7 and press felt 25.
Screen 1 may be part of a screen section of the machine which may further include screen rolls 2 and 3 for guiding screen 1. As shown, suction press roll 4 preferably abuts screen 1, i.e., through press felt 6, in a region formed between screen rolls 2 and 3.
Material web A, which may be lifted off screen 1 by the press felt 6 and suction press roll 4, may be successively guided through press gaps R, B and S. Because material web A is sandwiched between press felts 6 and 15 within press gap R, two-sided dewatering of material web A
occurs in press gap R due to the respective pressing of the press felts 6 and 15 by suction press roll 4 and additional press roll 14. Because material web A is sandwiched between press felt 6 and pay-out press roll 7 within press gap B, only one-sided dewatering occurs in press gap B due to a suction effect via vacuum 8 through suction press roll P15457.502 4. Because material web A is sandwiched between pay-out press roll 7 and press felt 25 within press gap S, one-sided dewatering occurs in press gap S due to press felt 25 associated with additional press roll 24.
In the first embodiment represented in Fig. 1, suction press roll 4 may be comprised of a hollow roll having a rigid roll jacket 30. Rigid roll jacket 30 may be supported on its interior by, and rotatable around, a core 32.
Suction press roll 4 may be provided with an external suction box 34 to suction off a region 36 located within rigid roll jacket 30.
Each of press gaps R and S may be formed as elongated press gaps elongated in travel direction of material web A.
Further, press gap B may also be formed as an elongated press gap elongated in the travel direction of material web A.
Additional press rolls 14 and 24 and pay-out press roll 7 may be comprised of deflection compensation rolls having a circumferential roll jacket 17, 26, and 38, respectively, a core 16 extending longitudinally through each of the circumferential roll jackets, and at least one hydrostatic and/or hydrodynamic support element 18, 27, 27' and 40, respectively, supporting the respective roll jacket 17, 26, and 38 on core 16 within each respective press gap region. As shown in Figure 1, roll jacket 38 may include support elements associated with more than one press gap.
For example, roll jacket 38 may be supported in the region of press gap S with at least one hydrostatic and or hydrodynamic support element 27' positioned adjacent to P15457.S02 support element 27 of additional press roll 24, and in the region of press gap B with at least one hydrostatic and/or hydrodynamic support element 40 positioned adjacent to suction press roll 4.
In the preferred embodiment of the present invention, roll jackets 26 and 38 may be made of a flexible material.
Because adjacent support elements 27 and 27' are positioned to support roll jackets 26 and 38, respectively, and to form an elongated press gap, i.e., press gap S, the press surfaces of support elements 27 and 27' should be complementary. Thus, in a preferred embodiment of the present invention, hydrostatic and/or hydrodynamic support elements 27 and 27' may include substantially planar press surfaces for forming the elongated press gap S. However, it is also contemplated that support elements 27 and 27' may be formed by complementary concave and convex press surfaces to ensure formation of a press gap S that is elongated in the travel direction of the material web A.
Hydrostatic and or hydrodynamic support elements 40, also associated with pay-out press roll 7 to support roll jacket 38 and form an elongated press gap, i.e., press gap B, may include a press surface that is complementary to an outer surface of suction press roll 4. Thus, in accordance with the preferred embodiment of the present invention, the press surface of support element 40 may be concave with a curvature to complement the outer curvature of rigid roll jacket 30. Thus, flexible roll jacket 38 may be pressed against rigid roll jacket 30 to form press gap B, which is elongated in the travel direction of the material web A.
Hydrostatic and/or hydrodynamic support elements 18, P15457.502 which support roll jacket 17 and form an elongated press gap, i.e., press gap R, may include a press surface that is complementary to an outer surface of suction press roll 4.
Thus, in accordance with the preferred embodiment of the present invention, the press surface of support element 18 may be concave with a curvature to complement the outer curvature of rigid roll jacket 30. Thus, flexible roll jacket 17 may be pressed against rigid roll jacket 30 to form press gap R, which is elongated in the travel direction of the material web A. Further, press gap R may extend over the larger portion of the outer circumference of suction press roll 4 than press gap B. Thus, the concave press surface of support element 18 may be longer than the concave press surface of support element 40.
The roll jacket of additional press roll 24 may also include recesses for receiving press water. The recesses may be formed, e.g., as circumferential grooves and/or blind bores.
Cores 16 may be substantially stationary, at least during operation. Further, pay-out press roll 7 may be provided with a roll jacket that may be radially fixed in place at its ends, at least during operation.
As shown in Figure 1, axes of each of suction press roll 4, pay-out press roll 7, and additional press roll 24 may be substantially collinearly arranged to form a line positioned at a predetermined angle from a vertical reference line, e.g., perpendicular to a base of the machine. In accordance with the preferred embodiment, the line formed by the collinear arrangement of the rolls may be positioned, e.g., at approximately 45° with respect to P15457.S02 the vertical reference. Further, in accordance with the preferred embodiment, additional press roll 14 may be located below suction press roll 4 such that a straight line extending through the axes of suction press roll 4 and additional press roll 14 substantially forms a right angle with the line formed by the collinear arrangement of the rolls.
In an alternative embodiment illustrated in Figure 2, additional press roll 24 may rotated out of collinear arrangement of Figure 1 to be located directly above pay out press roll 7, with respect to a machine foundation 44.
Thus, a straight line extending through the axes of pay-out press roll 7 and additional press roll 24 may be substantially vertical with respect to machine foundation 44. Generally, in all other respects the roll press illustrated in Figure 2 is substantially similar to the roll press depicted in Figure 1, thus, same reference numerals have bee associated to similar elements.
Therefore, in accordance with the respective seating of the rolls as shown in the alternative embodiment of Figure 2, pay-out press roll 7 may be fixed in a defined position, i.e., substantially without any radial deflection, on a stanchion (upright support beam) 42 which may be fixedly mounted fixed on machine foundation 44.
At least during operation of the roll press, the jacket of pay-out press roll 7 may be substantially radially fixed at its ends to maintain a substantially unchanged position even under a pressure load.
A position adjustment may be utilized to ensure that press gap S remains in its preset position. Thus, press P15457.S02 gap S is held in position independently of the respective pressure force and the respective machine speed. At least one position sensor and at least one pressure force regulating device may be provided for at least one of the respective support elements.
As illustrated in Figures 2 and 3, during operation of the roll press, press rolls 4, 7, 14 and 24 forming the three press gaps may be supported against each other and/or connected to each other, with regard to forces, such that practically no pressing forces need to be absorbed by other seating elements. That is, the pressing forces may be absorbed by the associated bearing parts supporting the roll journals or the roll cores.
The respective courses of the force flow, illustrated in bold lines (solid and dashed) in Figure 3, may result in the region of the three press gaps. Accordingly, force lines closed in themselves result above the respective press gaps, which leads to the fact that the pressing forces which, as a rule, are relatively high, only need to be absorbed by the associated bearing elements supporting the roll journals or the cores. That is, the force lines associated with gap R, gap B, and gap S run through the centers of the respective bearings and through the respective centers of the press gaps. Therefore, additional bearing elements need not be laid out for these high pressing forces.
The roll press of the present invention may include connecting elements provided between the bearing places to releasably couple the rolls together. Further, the rolls may be released, e.g., to enable changing the rolls or P15457.S02 coverings.
The roll press in Figure 2 may be illustrated, e.g., during a phase in which press felt 6 is being changed, as shown in Figure 4. Figure 4 shows suction press roll 4 in a released state, i.e., not abutting screen 1, additional press roll 14, and pay-out press roll 7 through press felt 6. Press felt 6 may be freely supported by a cantilever carrier 46 on the guide or operator side, and it may be supported on the drive side. To loosen press felt 6 for changing, intermediate pieces 48 (associated with suction press roll 4 and shown in Figure 2) may be removed, e.g., by lifting the bearing arrangement located above it with a crane.
In accordance with Figure 4, press felt 6, which was clamped on a deflection roll 50 as shown in Figure 2, may be partially wound onto a roll 52.
Figure 5 shows the roll press of Fig. 2 during a phase in which press felt 25 is being changed. Prior to changing press felt 25, intermediate pieces 48 (associated with additional press roll 24 and shown in Figure 2) may be removed.
To change press felt 25, the connecting elements of additional press roll 24 and pay-out press roll 7 and the seating elements on the guide side may be released.
Thereafter, additional press roll 24 may be lifted by a support device fastened on its core, around which the felt had previously been draped.
In accordance with Figure 5, press felt 25, which was previously clamped on a deflection roll 54, as shown in Figure 2, and which is now being change, may be partially P15457.S02 wound onto a roll 56.
The frame seating may be exclusively provided for supporting the felt running devices and for receiving the inherent weight of the pressing installations. Thus, the frame seating is not used to absorb pressing forces exerted on the material web.
The frame seating may be integrated into a forming and screen section disposed upstream, with respect to the travel direction of the material web. For performing a screen change, appropriate interrupting devices may be provided on the guide side. In this case, the frame seating may be supported on the guide side by the cantilever carrier of suction press roll 4.
In accordance with the present invention, the entire pressing arrangement may not include seating elements on machine foundation 44 in front of the machine. That is, the machine may be free of such seating elements in front of the machine girder on the guide side, on which the frame stanchion and the stanchion of the pay-out press roll are supported.
In accordance with Figure 6, when changing press felt 15, after releasing the connecting elements on the guide side, additional press roll 14 may be lowered by a support device fastened on the core of the press roll 14, around which the new felt had been previously draped. The support device may be, e.g., a push-on tube.
The roll press can have a crane rail for a respective roll change, which extends transversely with respect to the paper machine and may perform various functions. For example, crane rail 58 (Figure 3) may be intended for use P15457.S02 as an extension aid for supporting the end of suction press roll 4 on the drive side. It may also be used as an insertion aid for supporting the end of the felt insertion device on the drive side for press felt 6 associated with suction press roll 4. It may also be used as an insertion aid for supporting the end of the felt insertion device on the drive side for press felt 25, which may be guided around additional press roll 24.
The roll press, in accordance with the features of the present invention, has the advantage that a closed web guide results from a pick-up place at a screen side of the machine to an end of the roll press. Overall, not much re wetting is permitted, which ensures the highest degree of dry content for the material web. Because there are no open sections inside the press, no stretching of the paper and no loss of wet strength occurs. The first open section may be located downstream of the roll press at maximum wet strength. The highest degree of wet strength may be ensured because only one transfer point downstream of the press section is provided.
Even with a production width variation, it may be possible to always ensure a constant paper width through each press gaps or nips. A variable edge strip may run off a central roll. It is also important that the press felts and press rolls may always be operated with the same paper width. The desired high dry content may be achieved, e.g., with.only one press, which results in a reduced number of rolls.
Further, an extremely compact structure or construction of the roll press is available. Thus, in P15457.S02 addition to space savings, the present invention may be essential, e.g., for problem-free retrofitting of replacement components.
Because direct force flow may be provided for all press gaps or nips, portal seating may be omitted and no stanchions are provided on the outside of the drive side.
Accordingly, more free space may be created in front of the machine and there is no load on the cover.
Furthermore, good access may be provided by bridge seating. A respective felt or roll change may be possible without problems. Further, improved accessibility may be provided for adjustment, maintenance and cleaning operations.
Due to the lack of a transverse support above the press, an optimal nip arrangement, e.g., in the form of a four-roll Nipco-Flex combination press, may be provided.
A stationary path run geometry downstream of the press may result in a stationary driven central press roll (Nico-P-roll) after the press roll has been mounted on a stanchion. Furthermore, a locally stable scraper embodiment may be utilized. Due to the specific arrangement of the present invention, the roll press may also be insensible to drive oscillations.
Further, a high degree of operational dependability may result for a respective shoe press in an installment position, such as that provided by the present invention.
The clotting danger may be reduced to a minimum by a closed web removal. Manual application (e. g., by a glass tube) may be omitted, the same as the two nips for pre calibration. Optimal press jacket lubrication may be P15457.S02 utilized in the event of an inverted shoe arrangement.
A relatively simple press roll change may be possible in spite of the compact construction. The press rolls may be changed (or replaced) independently of each other with little expenditure of time. Extension devices may be provided for each press roll, which reduces the time necessary of operating the crane to a minimum. However, a roll change may be basically possible without a crane, e.g., by rails located in front of the machine.
Press felt 6 associated with suction press roll 4 may be fully cantilevered. That is, the felt can be changed without problems by rails located in front of the machine.
Alternatively, press felt 6 associated with suction press roll 4 may be fully cantilevered. That is, the felt may be changed without problems by a felt change insertion device.
The upper felt may be portable by a press jacket changing device. Again, a felt change insertion device may be utilized. Further, the lower felt may be portable (e. g., push-on tube on a Nipco core). Extensible felt guide rolls located on the inside may be utilized.
In addition, improved accessibility for Scanpro measurements may be achieved.
Finally, a cost-effective overall roll press concept may be contemplated. For example, since a separate Nipco Flex press is not necessarily provided in the construction of the present invention, only a few reserve rolls may be required. Further, a very small construction cost portion may also result from the reduced space requirements.
It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in f P15457.502 no way to be construed as limiting of the present invention. While the invention has been described with reference to a preferred embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the invention in its aspects. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein; rather, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.
P15457.502 Reference Numeral List 1 screen 2 screen roll 3 screen roll 4 suction press roll 6 press felt 7 pay-out press roll 8 vacuum 14 additional press roll 15 press felt 16 core 17 roll jacket 18 support element 24 additional press roll 25 press felt 26 roll jacket 27 support element 27' support element 30 roll jacket 32 core 34 suction box 36 region 38 roll jacket 40 support element 42 stanchion 44 machine foundation 46 cantilever carrier 48 intermediary pieces 50 deflection roll 52 roll P15457.502 54 deflection roll 56 roll A paper web B press gap R additional press gap S additional press gap
Claims (36)
1. A roll press of a machine for producing a material web comprising:
a suction press roll;
a press felt associated with, and guided around at least a portion of the suction roll;
the suction roll lifting the material web from a screen;
a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll;
a first additional press roll forming a first additional press gap with the suction press roll;
a first additional press felt, associated with the first additional press roll, passing through the first additional press gap;
a second additional press roll forming a second additional press gap with the pay-out press roll;
a second additional press felt, associated with the second additional press roll, passing through the second additional press gap;
at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
a suction press roll;
a press felt associated with, and guided around at least a portion of the suction roll;
the suction roll lifting the material web from a screen;
a pay-out press roll forming a press gap with the suction press roll to transfer the material web to the pay-out roll;
a first additional press roll forming a first additional press gap with the suction press roll;
a first additional press felt, associated with the first additional press roll, passing through the first additional press gap;
a second additional press roll forming a second additional press gap with the pay-out press roll;
a second additional press felt, associated with the second additional press roll, passing through the second additional press gap;
at least one of the press gap, the first additional press gap, and the second additional press gap comprising an elongated press gap that is elongated in a travel direction of the material web.
2. The roll press according to claim 1, at least the second additional press gap comprising the elongated press gap.
3. The roll press according to claim l, the suction press roll abuts the screen through the press felt to lift the material web off the screen and onto the press felt.
4. The roll press according to claim 1, the suction press roll, the pay-out press roll, and the first and second additional press rolls being at least one of positioned and supported to cancel out the forces exerted by the press gap, the first additional press gap and the second additional press gap, such that the exerted forces are not absorbed by at least one of a machine foundation and an external seating.
5. The roll press according to claim 1, at least one of the first and second additional press rolls comprising a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one support element supporting the roll jacket comprising at least one of hydrostatic and hydrodynamic support elements.
6. The roll press according to claim 5, the second additional press roll comprising a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex support element comprising one of hydrostatic and hydrodynamic support elements; and the at least one non-convex support element forming, with the pay-out press roll, the second additional press gap, comprising the elongated press gap.
7. The roll press according to claim 5, the first additional press roll comprising a deflection compensation roll having a flexible roll jacket, a core passing through the flexible roll jacket, and at least one non-convex support element comprising at least one of hydrostatic and hydrodynamic support elements; and the at least one non-convex support element forming, with the suction press roll, the first additional press gap, comprising the elongated press gap.
8. The roll press according to claim 1, the second additional press roll comprising a deflection compensation roll having a rigid roll jacket.
9. The roll press according to claim 1, the first additional press roll comprising a deflection compensation roll having a rigid roll jacket.
10. The roll press according to claim 1, a roll jacket associated with at least one of the pay-out press roll, the first additional press roll, and the second additional press roll, comprising recesses for receiving press water in the appropriate at least one of the press gap, the first additional press gap, and the second additional press gap.
11. The roll press according to claim 1, the pay-out press roll comprising a deflection compensation roll having a rotating roll jacket, a core passing through the roll jacket, and at least one support element, comprising at least one of hydrostatic and hydrodynamic support elements, supporting the roll jacket on the core.
12. The roll press according to claim 11, the pay-out press roll comprising a deflection compensation roll having a rigid roll jacket.
13. The roll press according to claim 11, the roll jacket comprising a deflection compensation roll that is radially fixed on its ends, at least during operation of the roll press.
14. The roll press according to claim 1, the pay-out press roll comprising a deflection compensation roll having at least one hydraulically actuated support element comprising at least one of hydrostatic and hydrodynamic support elements;
the second additional press roll comprising a deflection compensation roll having at least one hydraulically actuated support element comprising at least one of hydrostatic and hydrodynamic support elements; and the at least one hydraulically actuated support element of the second additional press roll being hydraulically coupled to the at least one hydraulically actuated support element.
the second additional press roll comprising a deflection compensation roll having at least one hydraulically actuated support element comprising at least one of hydrostatic and hydrodynamic support elements; and the at least one hydraulically actuated support element of the second additional press roll being hydraulically coupled to the at least one hydraulically actuated support element.
15. The roll press according to claim 1, further comprising:
a stanchion which is securely mounted to a machine foundation;
the pay-out press roll being rotatably mounted on the stanchion and fixed in a definite position to substantially eliminate radial deflection.
a stanchion which is securely mounted to a machine foundation;
the pay-out press roll being rotatably mounted on the stanchion and fixed in a definite position to substantially eliminate radial deflection.
16. The roll press according to claim 1, the pay-out press roll comprising a deflection compensation roll having a flexible roll jacket, a core passing through the roll jacket, and at least one non-convex support element comprising at least one of hydrostatic and hydrodynamic support elements;
the at least one non-convex support element forming the elongated press gap comprising at least one of the press gap and the second additional press gap.
the at least one non-convex support element forming the elongated press gap comprising at least one of the press gap and the second additional press gap.
17. The roll press according to claim 16, the second additional press roll comprising a deflection compensation roll having a flexible roll jacket and at least one non-convex support element comprising at least one of hydrostatic and hydrodynamic support elements;
the at least one non-convex support elements of the pay-out press roll and of the second additional press roll comprising substantially planar surfaces oriented toward their respective roll jackets to form the second additional press gap.
the at least one non-convex support elements of the pay-out press roll and of the second additional press roll comprising substantially planar surfaces oriented toward their respective roll jackets to form the second additional press gap.
18. The roll press according to claim 1, at least one of the suction press roll, the pay-out press roll, and the first and second additional press rolls comprising a deflection compensation roll having a radially moving roll jacket.
19. The roll press according to claim 1, further comprising a position regulator that fixes the at least the second additional press gap in a predetermined spatial position during operation of the roll press.
20. The roll press according to claim 1, the suction press roll comprising a hollow roll having a core and a roll jacket supported on its interior and rotatable around the core.
21. The roll press according to claim 1, the suction press roll comprising an external suction box that suctions off a region located within the suction press roll.
22. The roll press according to claim 1, further comprising a felt changing retraction device for changing at least one of the press felt, and the first and second additional press felts.
23. The roll press according to claim 1, further comprising a cantilever carrier carrying the press felt in a cantilevered manner to facilitate replacing the press felt.
24. The roll press according to claim 1, further comprising a support device for adjustably positioning the second additional press roll for facilitating changing the second additional press felt for the second additional press roll;
the support device comprising a coupling device to couple a core of the second additional press roll to the support device.
the support device comprising a coupling device to couple a core of the second additional press roll to the support device.
25. The roll press according to claim 1, further comprising a support device for adjustably positioning the suction press roll for facilitating changing the first additional press felt;
the support device comprising a coupling device to couple a core of the second additional press roll to the support device, the core comprising a slip-mounted pipe.
the support device comprising a coupling device to couple a core of the second additional press roll to the support device, the core comprising a slip-mounted pipe.
26. A roll press for a continuous material web producing machine comprising:
a first press roll;
a second press roll;
a third press roll;
a fourth press roll;
said first, second, third, and, fourth press rolls arranged to form a first, second, and third press gap;
said first press roll positioned to lift the material web off a screen;
said second press roll positioned adjacent said first press roll to form said second press gap and to transfer the material web to said second press roll;
said second press roll forming a part of each of said second and third press gaps;
said first press gap comprising a two-sided dewatering gap;
said second and third press gaps comprising one-sided dewatering gaps; and said third press gap comprising an elongated press gap elongated in a travel direction of the material web.
a first press roll;
a second press roll;
a third press roll;
a fourth press roll;
said first, second, third, and, fourth press rolls arranged to form a first, second, and third press gap;
said first press roll positioned to lift the material web off a screen;
said second press roll positioned adjacent said first press roll to form said second press gap and to transfer the material web to said second press roll;
said second press roll forming a part of each of said second and third press gaps;
said first press gap comprising a two-sided dewatering gap;
said second and third press gaps comprising one-sided dewatering gaps; and said third press gap comprising an elongated press gap elongated in a travel direction of the material web.
27. The roll press according to claim 26, at least one of said second, third and fourth press rolls comprising a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a part of at least one of said first, second, and third press gaps.
28. The roll press according to claim 26, each of said second, third and fourth press rolls comprising a deflection compensation roll having a rotatable jacket and support elements supporting the rotatable jacket and forming a respective part of said first, second, and third press gap.
29. The roll press according to claim 28, said support elements comprising non-convex support surfaces.
30. The roll press according to claim 28, said second and third press roll comprising support elements having complementary support surfaces for forming said third press gap.
31. The roll press according to claim 28, said second press roll comprising support elements having a support surface complementary to an outer circumference of said first press roll for forming said second press gap, said second press gap comprising an elongated press gap elongated in a travel direction of the material web.
32. The roll press according to claim 29, said fourth press roll comprising support elements having a support surface complementary to an outer circumference of said first press roll for forming said first press gap, said first press gap comprising an elongated press gap elongated in a travel direction of the material web.
33. The roll press according to claim 26, each of said first, second, third, and fourth press rolls comprising a respective first, second, third, and fourth longitudinal axis;
said first, second, and third longitudinal axes being collinearly arranged to form a roll line at a predetermined angle from a vertical reference.
said first, second, and third longitudinal axes being collinearly arranged to form a roll line at a predetermined angle from a vertical reference.
34. The roll press according to claim 33, said fourth press roll arranged adjacent said first press roll such that a connecting line connecting said first and fourth longitudinal axes is substantially .perpendicular to said roll line.
35. The roll press according to claim 26, each of said first, second, third, and fourth press rolls comprising a respective first, second, third, and fourth longitudinal axis;
said first and second press roll arranged such that a line connecting said first and second longitudinal axes is at a predetermined angle from a vertical reference;
said third press roll positioned adjacent said second press roll such that a line formed through the second and third longitudinal axes is substantially parallel to said vertical reference; and said fourth roll is positioned adjacent said first roll such that a line connecting said first and fourth longitudinal axes is substantially perpendicular to said predetermined angle.
said first and second press roll arranged such that a line connecting said first and second longitudinal axes is at a predetermined angle from a vertical reference;
said third press roll positioned adjacent said second press roll such that a line formed through the second and third longitudinal axes is substantially parallel to said vertical reference; and said fourth roll is positioned adjacent said first roll such that a line connecting said first and fourth longitudinal axes is substantially perpendicular to said predetermined angle.
36. The roll press according to claim 26, said first roll comprising a suction press roll.~
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19613390A DE19613390A1 (en) | 1996-04-03 | 1996-04-03 | Roller press |
| DE19613390.4 | 1996-04-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2201668A1 CA2201668A1 (en) | 1997-10-03 |
| CA2201668C true CA2201668C (en) | 2007-03-13 |
Family
ID=7790408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002201668A Expired - Fee Related CA2201668C (en) | 1996-04-03 | 1997-04-03 | Roll press |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0799931B1 (en) |
| JP (1) | JPH1025687A (en) |
| AT (1) | ATE200324T1 (en) |
| CA (1) | CA2201668C (en) |
| DE (2) | DE19613390A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19912497A1 (en) * | 1999-03-19 | 2000-09-21 | Voith Sulzer Papiertech Patent | Press section for a wet paper or cardboard web has a swing frame and secondary levers for a compact combination press structure which can be opened for a blanket or roller change |
| JP2004169245A (en) * | 2002-11-22 | 2004-06-17 | Mitsubishi Heavy Ind Ltd | Shoe press for paper-making machine and press device for paper-making machine |
| AT514547B1 (en) * | 2013-06-25 | 2015-02-15 | Andritz Ag Maschf | Press section for dewatering a fibrous web |
| CN114261073A (en) * | 2021-12-23 | 2022-04-01 | 福建福融新材料有限公司 | A cast piece system for large-scale BOPP production and processing |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI772990A (en) * | 1977-10-11 | 1979-04-12 | Valmet Oy | FOERFARANDE OCH ANORDNING I EN PAPPERSMASKIN FOER LOESGOERING AV BANAN FRAON FORMERINGSVIRAN OCH DESS FRAMLEDNING SOM SLUTEN OEVERFOERING TILL PAPPERSMASKINENS PRESSDEL |
| CH607635A5 (en) * | 1976-06-14 | 1978-09-29 | Escher Wyss Ag | |
| DE4140879A1 (en) * | 1991-12-11 | 1993-06-17 | Voith Gmbh J M | PRESS RELEASE |
| DE4301751C2 (en) * | 1993-01-23 | 1996-10-31 | Voith Gmbh J M | Process for detaching a running fibrous web from two endless sieve belts |
| DE4301750C2 (en) * | 1993-01-23 | 1996-10-10 | Voith Gmbh J M | Method and device for dewatering a web using presses |
| DE4321399A1 (en) * | 1993-06-26 | 1993-11-11 | Voith Gmbh J M | Paper-making machine press section - has continuous water impermeable belt to take wet web from fourdrinier or blanket to press shoe |
| DE4340041A1 (en) * | 1993-11-24 | 1994-04-07 | Voith Gmbh J M | Paper-making machine press section - has two sections with a web transport roller between the shoe presses for consistent character on both sides of the web |
| DE29613944U1 (en) * | 1996-04-03 | 1996-10-24 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Roller press |
-
1996
- 1996-04-03 DE DE19613390A patent/DE19613390A1/en not_active Ceased
-
1997
- 1997-02-26 AT AT97103279T patent/ATE200324T1/en not_active IP Right Cessation
- 1997-02-26 DE DE59703264T patent/DE59703264D1/en not_active Expired - Fee Related
- 1997-02-26 EP EP97103279A patent/EP0799931B1/en not_active Expired - Lifetime
- 1997-04-03 JP JP9085341A patent/JPH1025687A/en active Pending
- 1997-04-03 CA CA002201668A patent/CA2201668C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0799931B1 (en) | 2001-04-04 |
| DE19613390A1 (en) | 1997-10-09 |
| ATE200324T1 (en) | 2001-04-15 |
| CA2201668A1 (en) | 1997-10-03 |
| JPH1025687A (en) | 1998-01-27 |
| DE59703264D1 (en) | 2001-05-10 |
| EP0799931A1 (en) | 1997-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |