CA2109781A1 - Press section for a paper machine - Google Patents
Press section for a paper machineInfo
- Publication number
- CA2109781A1 CA2109781A1 CA002109781A CA2109781A CA2109781A1 CA 2109781 A1 CA2109781 A1 CA 2109781A1 CA 002109781 A CA002109781 A CA 002109781A CA 2109781 A CA2109781 A CA 2109781A CA 2109781 A1 CA2109781 A1 CA 2109781A1
- Authority
- CA
- Canada
- Prior art keywords
- press section
- press
- section according
- deflection rolls
- rolls
- 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.)
- Abandoned
Links
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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
Abstract
PRESS SECTION FOR A PAPER MACHINE
ABSTRACT
The invention pertains to a press section for a paper machine with at least one pressing unit and another section downline from the press section, e.g., a second press section or a drying section, with wire mesh or felt belts which can be threaded through the nips, with deflection rolls downline from the nip to conduct the belt in question away from the paper web, and with a suction box, which is installed between the nip of the first press unit and the second deflection roll.
ABSTRACT
The invention pertains to a press section for a paper machine with at least one pressing unit and another section downline from the press section, e.g., a second press section or a drying section, with wire mesh or felt belts which can be threaded through the nips, with deflection rolls downline from the nip to conduct the belt in question away from the paper web, and with a suction box, which is installed between the nip of the first press unit and the second deflection roll.
Description
2~97~
PRESS SECTION FOR A PAPER MACHINE
The present invention pertains to a press section for a paper machine with at least one pressing unit and to a section downline from the press section.
In ~ost cases, the "downline section" would be another press section.
This can be a simple roll press with two rotatably supported press rolls. In addition, a so-called "shoe" press could be considered, which has a rotatably supported roll; a pressing shoe, which can be brought to bear against this roll; and a sliding belt, which is conducted through the nip between the pressing shoe and the roll. Finally, the "downline section" could also be the drying section of the paper machine.
:; "
A prior art press section is known from U.S. Patent No. a ::
4,561,939. This is known device comprises a first press unit :~
with two press rolls and a shoe press downline from that.
Each of these two press units has an upper felt and a lower felt.
~ orld Patent No. 88/8,051 also describes two press units, both of which are shoe presses. A suction roll is used to transfer the web between the two press units. In the transfer region, the paper web travels along an S-shaped paeh. Here, too, the two press units are double-felted.
In general, the transfer region between the press unit (which can be the only press unit or one of several press units) presents a number of problems.
First, the transfer region shoult be designed in such a way that the upline ~` 3~
~; .': , '' . . ~' , ' - ' :. : ' ' 3'r, ~
:!i,. ' , press unit can remove the water from the pap ~ n~ ~ optimum manner. This is, of course, the most important function of a press section. After the paper machine has been shut down and is then to be started up again, it should also be possible, however, to feed the transfer strip from the first press unit to the downline section in an easy and reliable manner.
In the prior art, it has been impossible to satisfy these two demands at the same time. In the case of a double-felted press section, the paper web travels jointly with the upper felt and the lower felt through the nip of the pressing unit.
The paper web is enclosed like a sandwich between these two felts. The two felts absorb water from the paper web in the nip. At this location there is the danger that water can flow back from the two fel~s into the paper web, which there-~ fore becomes wet again. To prevent this, ehe two felts should be sepsrated ¦ fro~ the paper web as soon a~ possible after they have passed through the nip.
Accordingly, at least one of the two felts should be guided in such a way after leaving~the nip that an angle of divergence is created between the paper web and the felt. After the paper machine has been turned off or after a tear in the web, it is necessary to "feed" the web through again, that is, to threading a narrow strip of the paper or the entire width of the paper web through the sections in question again. To accomplLsh this successfully, the initial section of the web must be guided as straight as possible through the transfer region. It is therefore undesirable for the paths along which the ' beginning section of the web the felt are guided to diverge from one another.
Wire screens are sometimes used in place of the press felts mentioned.It is an object of the present invention to provide a novel press section for a paper machine which obviates or mitigates at least one of the above-mentioned di~advantages of the prior art.
21~97~
According to a first aspect of the present invention, there is provided a press section for a paper machine with at least one press unit and another unit downline from the press section, comprising:
at least two belts;
two pressing elements forming a nip therebetween, each pressing element being partially wrapped by one of said belts;
a pair of guide rolls guiding each of said belts, a first ~ -guide roll of each pair being a deflection roll located downline from the nip and being movable toward and away from a paper web to msve its associated belt away from a paper web, one of said deflection rolls being spaced farther from the nip than the other of said deflection rolls, the belt associated with said one of said deflection rolls operable as a transfer belt to transfer said paper web to said unit downline;
a suction box located at the nip between said one of said deflection rolls and the transfer belt, the trailing edge of the suction box being rounded and the box being movable between operating and non-operating positions;
a third belt associated with said unit downline and overlapping said transfer belt.
The invention is based on the task o~ designin8 a press section with a downline unit for a paper machine in such a way that the problems of the transfer region are avoided. The machine is therefore to be designed in such `' ,.. ," , ' I : , ' ' . ' ' . , , . ` : : ' ~ ,::
: 210~781 a way that optimum pressing work is ensured during standard operation, with as little rewetting of the paper web as possible, and also so that satisfactory eransfer of the transfer strip can be achieved when the strip has to be threaded back through again after the machine has been stopped.
Accordingly, the two deflection rolls which deflect the upper and lower felts of the first (and possibly the only) pressing unit after the nip are supported in a displaceable or movabl2 fashion 90 that they can be taken out of the plane in which the paper web tra~els during normal operation.
In particular, the following advantages are thus derived:
After the paper machine has been idle or after the web has torn, the two units, namely, the first press unit and thc downline unit, can run in complete independence of each other. For example, the first pres3 unit (possibly the only pressing unit) can be started and brought up to normal speed, while the downline unit remains idle at firse. This can be advisable in an initial phase, e.g., to allow the felts to be threaded through. During an inieial phase, the paper web itself still travels through the flrst press unit and possibly through the second press unit and is then contucted into a vat located in the machine ba~ement underneath the press. ThLs downward deflec-tion of the web is facilitated or made possible in the first place by the capacity of the two deflection rolls to be displaced in accordance with the invention.
Because of the ability of the deflection rolls accorting to the invention to be moved to a different position, it is possible to direct the web along an essentially straight line. This ~akes it possible to guide both the transi-tion strip and also the complete web easily and accurately. In addition, itis also ensured that the paper web remains on the transfer felt (upper felt) both during the transfer process and later, after the complete wab has been fed through.
210~781 As soon as stable operation has been achieved, one of the two deflection rolls is moved in such a way that the paper web and the felt in question div-erge from each other at a certain angle.
A preferred embodiment of the invention will now be ', described, by way of example only, with reference to the attached Figures, wherein:
Figure 1 shows a press section in accordance with thepresent invention in its configuration prior to the start of the paper making machine;
Figure 2 shows the press section of Figure 1 in its configuration to effect transfer o~ a web; and Figure 3 shows the press section of Figure 1 in its normal operating position.
The press section comprises two press units, each of which is designed as a shoe press. The press which comes first in the direction of travel of the paper web (see arrow A) comprises a press roll 1. This operates together with a pressing element, which consists essentially of a pressing shoe 2 and an impermeable press belt 3, which wraps around the shoe. These two form together a press nip, which extends for a considerable distance in the travel direction of the paper web. Two felts 4, 5 pass through the nip. These two press belts pass around not only pressing elements l, 2, and 3 but also around a series of other components. For example, lower felt 4 wraps around guide ¦ rolls 6, 7, and upper felt 5 wraps around a suction takeoff roll 8, a suction box 9, and a guid- roll 10. Additional guide rolls are present, but they are not shown here. Suction guide roll 8 receives the approaching paper web from I the wire ~ection, namely, from wire 11.
I The second press unit also has a press roll 1.1 and a pressing element ¦ cooperating with it, co~prising a pressing shoe 2.1 and a press belt 3.1, which wraps around the shoe. In contrast to the first press unit, which is double-felted, the second pressing unit has only a single felt, namely, lower ;
.
21~7~
felt 12.
After the second press unit comes the drying section, of which only a guide roll 20 and a drying screen 21 are visible. The paper web is trans-ferred from press roll 1.1 to drying screen 21.
Especially important for the implementation of the invention is the fact tkat at least the two last (seen in the direction of travel of tha paper web) guide rolls 7, 10, referred to in this application as "transfer rolls", are movable in tha direction of arrows B and C. The capacity for movement can be achieved in practice by the use of guide rails, which extend in the direction of arrows B, C, and on which the bearings of the two transfer rolls can be pushed. The two rolls can also be moved by means of pivoting levers. To facilitate the transfer, a transfer blade 1.5 is provided on press roll 1.1.
The three figures represent specifically the following phases of oper-ation:
Figure 1 shows the phase before the paper machine ls started, e.g., the first phase after the shutdown of the paper machine, such as after a preceding maintenance process, after the replacement of the wire, or after a change of felts.
One of the ewo deflection rolls of this first press unit, namely, deflec-tion roll 10, has been backed off in the direction of arrow C, so that there is no longer any connsction between the two press units by way of the felts.
Suction box 9 has a erailing edge, which is rounded. For this resson, deflec-tion roll 10 can be moved a considerable distance in the upward direc~ion, and uppar felt 5 can make a small bend there. The two press units can now be operated independently of each other. This situation can be necessary for a certain period of ti~e after new felts have been pulled through, but it can ','.': ' ~
:. . . . .
also be useful when it is necessary to clean ~he felts.
At a certain point, the pulp suspension begins to be deposited on wire 11 from a headbox, not shown here, and the web starts to travel onward. At this point either only a narrow transfer strip or the entire paper web is threaded through. Then the transfer strip or the paper web runs automatically eo the un$t downline from the first press unit, i.e., to a second pressing unit, for example.
Before the transfer strip or web is transferred from the first press unit to the second press unit, the two deflection rolls 7, 10 are moved into posi-tions which allow the two felts 4, 5 to travel parallel to each for as long as possible. This is the plane in which later the paper web will run during nor-mal operation. This phase ls shown in Figure 2. As can be seen, roll 7 is in its upper position (as already seen in Figure 1), whereas roll 10 has been lowered. It has been lowered to such an extent that felt 5 now touches lower felt 12 of the second press unit. This is in the area of a guide roll 13 of lower felt 12. Guider roll 13 has a suction zone 14. In this phace1 the vacuum to the suction box is on; suction box 9 is therefore operating, and the transfer strip or the web is held agsinst upper felt 5.
As can be seen, the transfer of the transfer strip and the paper web pro-ceed~ with almost no change of direction. In any casa, there are no abrupt changes of direction with small radii of curvature. In no case whatever is there an S-~haped deflection. The transfer proceeds essentially along a straight line.
Figure 3 illustrates the phase of normal operation. The transfer strip ~ ;
spreads out at a certain point to assume the full wldth of the web, so that ths web now travels in its full width through the first press unit, across the 21~97~
~ransfer section, and through the second press unie. Now, while the suction box vacuum is still operating, roll 7 is lowered in the direction of arrow B.
The suction box reduces the rewetting of the paper web after the web has passed through the first nip, but it also prevents the web from adhering to lower felt 4 and from continuing to travel with it. Upper felt 5 and the web therefore emerge from the first nip together.
During normal operation, the vacuum at suction box 9 is off, so that the web can stretch out after the first, double-felted pressing unit.
~.:
:
:- . ~ .
:-
PRESS SECTION FOR A PAPER MACHINE
The present invention pertains to a press section for a paper machine with at least one pressing unit and to a section downline from the press section.
In ~ost cases, the "downline section" would be another press section.
This can be a simple roll press with two rotatably supported press rolls. In addition, a so-called "shoe" press could be considered, which has a rotatably supported roll; a pressing shoe, which can be brought to bear against this roll; and a sliding belt, which is conducted through the nip between the pressing shoe and the roll. Finally, the "downline section" could also be the drying section of the paper machine.
:; "
A prior art press section is known from U.S. Patent No. a ::
4,561,939. This is known device comprises a first press unit :~
with two press rolls and a shoe press downline from that.
Each of these two press units has an upper felt and a lower felt.
~ orld Patent No. 88/8,051 also describes two press units, both of which are shoe presses. A suction roll is used to transfer the web between the two press units. In the transfer region, the paper web travels along an S-shaped paeh. Here, too, the two press units are double-felted.
In general, the transfer region between the press unit (which can be the only press unit or one of several press units) presents a number of problems.
First, the transfer region shoult be designed in such a way that the upline ~` 3~
~; .': , '' . . ~' , ' - ' :. : ' ' 3'r, ~
:!i,. ' , press unit can remove the water from the pap ~ n~ ~ optimum manner. This is, of course, the most important function of a press section. After the paper machine has been shut down and is then to be started up again, it should also be possible, however, to feed the transfer strip from the first press unit to the downline section in an easy and reliable manner.
In the prior art, it has been impossible to satisfy these two demands at the same time. In the case of a double-felted press section, the paper web travels jointly with the upper felt and the lower felt through the nip of the pressing unit.
The paper web is enclosed like a sandwich between these two felts. The two felts absorb water from the paper web in the nip. At this location there is the danger that water can flow back from the two fel~s into the paper web, which there-~ fore becomes wet again. To prevent this, ehe two felts should be sepsrated ¦ fro~ the paper web as soon a~ possible after they have passed through the nip.
Accordingly, at least one of the two felts should be guided in such a way after leaving~the nip that an angle of divergence is created between the paper web and the felt. After the paper machine has been turned off or after a tear in the web, it is necessary to "feed" the web through again, that is, to threading a narrow strip of the paper or the entire width of the paper web through the sections in question again. To accomplLsh this successfully, the initial section of the web must be guided as straight as possible through the transfer region. It is therefore undesirable for the paths along which the ' beginning section of the web the felt are guided to diverge from one another.
Wire screens are sometimes used in place of the press felts mentioned.It is an object of the present invention to provide a novel press section for a paper machine which obviates or mitigates at least one of the above-mentioned di~advantages of the prior art.
21~97~
According to a first aspect of the present invention, there is provided a press section for a paper machine with at least one press unit and another unit downline from the press section, comprising:
at least two belts;
two pressing elements forming a nip therebetween, each pressing element being partially wrapped by one of said belts;
a pair of guide rolls guiding each of said belts, a first ~ -guide roll of each pair being a deflection roll located downline from the nip and being movable toward and away from a paper web to msve its associated belt away from a paper web, one of said deflection rolls being spaced farther from the nip than the other of said deflection rolls, the belt associated with said one of said deflection rolls operable as a transfer belt to transfer said paper web to said unit downline;
a suction box located at the nip between said one of said deflection rolls and the transfer belt, the trailing edge of the suction box being rounded and the box being movable between operating and non-operating positions;
a third belt associated with said unit downline and overlapping said transfer belt.
The invention is based on the task o~ designin8 a press section with a downline unit for a paper machine in such a way that the problems of the transfer region are avoided. The machine is therefore to be designed in such `' ,.. ," , ' I : , ' ' . ' ' . , , . ` : : ' ~ ,::
: 210~781 a way that optimum pressing work is ensured during standard operation, with as little rewetting of the paper web as possible, and also so that satisfactory eransfer of the transfer strip can be achieved when the strip has to be threaded back through again after the machine has been stopped.
Accordingly, the two deflection rolls which deflect the upper and lower felts of the first (and possibly the only) pressing unit after the nip are supported in a displaceable or movabl2 fashion 90 that they can be taken out of the plane in which the paper web tra~els during normal operation.
In particular, the following advantages are thus derived:
After the paper machine has been idle or after the web has torn, the two units, namely, the first press unit and thc downline unit, can run in complete independence of each other. For example, the first pres3 unit (possibly the only pressing unit) can be started and brought up to normal speed, while the downline unit remains idle at firse. This can be advisable in an initial phase, e.g., to allow the felts to be threaded through. During an inieial phase, the paper web itself still travels through the flrst press unit and possibly through the second press unit and is then contucted into a vat located in the machine ba~ement underneath the press. ThLs downward deflec-tion of the web is facilitated or made possible in the first place by the capacity of the two deflection rolls to be displaced in accordance with the invention.
Because of the ability of the deflection rolls accorting to the invention to be moved to a different position, it is possible to direct the web along an essentially straight line. This ~akes it possible to guide both the transi-tion strip and also the complete web easily and accurately. In addition, itis also ensured that the paper web remains on the transfer felt (upper felt) both during the transfer process and later, after the complete wab has been fed through.
210~781 As soon as stable operation has been achieved, one of the two deflection rolls is moved in such a way that the paper web and the felt in question div-erge from each other at a certain angle.
A preferred embodiment of the invention will now be ', described, by way of example only, with reference to the attached Figures, wherein:
Figure 1 shows a press section in accordance with thepresent invention in its configuration prior to the start of the paper making machine;
Figure 2 shows the press section of Figure 1 in its configuration to effect transfer o~ a web; and Figure 3 shows the press section of Figure 1 in its normal operating position.
The press section comprises two press units, each of which is designed as a shoe press. The press which comes first in the direction of travel of the paper web (see arrow A) comprises a press roll 1. This operates together with a pressing element, which consists essentially of a pressing shoe 2 and an impermeable press belt 3, which wraps around the shoe. These two form together a press nip, which extends for a considerable distance in the travel direction of the paper web. Two felts 4, 5 pass through the nip. These two press belts pass around not only pressing elements l, 2, and 3 but also around a series of other components. For example, lower felt 4 wraps around guide ¦ rolls 6, 7, and upper felt 5 wraps around a suction takeoff roll 8, a suction box 9, and a guid- roll 10. Additional guide rolls are present, but they are not shown here. Suction guide roll 8 receives the approaching paper web from I the wire ~ection, namely, from wire 11.
I The second press unit also has a press roll 1.1 and a pressing element ¦ cooperating with it, co~prising a pressing shoe 2.1 and a press belt 3.1, which wraps around the shoe. In contrast to the first press unit, which is double-felted, the second pressing unit has only a single felt, namely, lower ;
.
21~7~
felt 12.
After the second press unit comes the drying section, of which only a guide roll 20 and a drying screen 21 are visible. The paper web is trans-ferred from press roll 1.1 to drying screen 21.
Especially important for the implementation of the invention is the fact tkat at least the two last (seen in the direction of travel of tha paper web) guide rolls 7, 10, referred to in this application as "transfer rolls", are movable in tha direction of arrows B and C. The capacity for movement can be achieved in practice by the use of guide rails, which extend in the direction of arrows B, C, and on which the bearings of the two transfer rolls can be pushed. The two rolls can also be moved by means of pivoting levers. To facilitate the transfer, a transfer blade 1.5 is provided on press roll 1.1.
The three figures represent specifically the following phases of oper-ation:
Figure 1 shows the phase before the paper machine ls started, e.g., the first phase after the shutdown of the paper machine, such as after a preceding maintenance process, after the replacement of the wire, or after a change of felts.
One of the ewo deflection rolls of this first press unit, namely, deflec-tion roll 10, has been backed off in the direction of arrow C, so that there is no longer any connsction between the two press units by way of the felts.
Suction box 9 has a erailing edge, which is rounded. For this resson, deflec-tion roll 10 can be moved a considerable distance in the upward direc~ion, and uppar felt 5 can make a small bend there. The two press units can now be operated independently of each other. This situation can be necessary for a certain period of ti~e after new felts have been pulled through, but it can ','.': ' ~
:. . . . .
also be useful when it is necessary to clean ~he felts.
At a certain point, the pulp suspension begins to be deposited on wire 11 from a headbox, not shown here, and the web starts to travel onward. At this point either only a narrow transfer strip or the entire paper web is threaded through. Then the transfer strip or the paper web runs automatically eo the un$t downline from the first press unit, i.e., to a second pressing unit, for example.
Before the transfer strip or web is transferred from the first press unit to the second press unit, the two deflection rolls 7, 10 are moved into posi-tions which allow the two felts 4, 5 to travel parallel to each for as long as possible. This is the plane in which later the paper web will run during nor-mal operation. This phase ls shown in Figure 2. As can be seen, roll 7 is in its upper position (as already seen in Figure 1), whereas roll 10 has been lowered. It has been lowered to such an extent that felt 5 now touches lower felt 12 of the second press unit. This is in the area of a guide roll 13 of lower felt 12. Guider roll 13 has a suction zone 14. In this phace1 the vacuum to the suction box is on; suction box 9 is therefore operating, and the transfer strip or the web is held agsinst upper felt 5.
As can be seen, the transfer of the transfer strip and the paper web pro-ceed~ with almost no change of direction. In any casa, there are no abrupt changes of direction with small radii of curvature. In no case whatever is there an S-~haped deflection. The transfer proceeds essentially along a straight line.
Figure 3 illustrates the phase of normal operation. The transfer strip ~ ;
spreads out at a certain point to assume the full wldth of the web, so that ths web now travels in its full width through the first press unit, across the 21~97~
~ransfer section, and through the second press unie. Now, while the suction box vacuum is still operating, roll 7 is lowered in the direction of arrow B.
The suction box reduces the rewetting of the paper web after the web has passed through the first nip, but it also prevents the web from adhering to lower felt 4 and from continuing to travel with it. Upper felt 5 and the web therefore emerge from the first nip together.
During normal operation, the vacuum at suction box 9 is off, so that the web can stretch out after the first, double-felted pressing unit.
~.:
:
:- . ~ .
:-
Claims (14)
1. A press section for a paper machine with at least one press unit and another unit downline from the press section, comprising:
at least two belts;
two pressing elements forming a nip therebetween, each pressing element being partially wrapped by one of said belts;
a pair of guide rolls guiding each of said belts, a first guide roll of each pair being a deflection roll located downline from the nip and being movable toward and away from a paper web to move its associated belt away from a paper web, one of said deflection rolls being spaced farther from the nip than the other of said deflection rolls, the belt associated with said one of said deflection rolls operable as a transfer belt to transfer said paper web to said unit downline;
a suction box located at the nip between said one of said deflection rolls and the transfer belt, the trailing edge of the suction box being rounded and the box being movable between operating and non-operating positions;
a third belt associated with said unit downline and overlapping said transfer belt.
at least two belts;
two pressing elements forming a nip therebetween, each pressing element being partially wrapped by one of said belts;
a pair of guide rolls guiding each of said belts, a first guide roll of each pair being a deflection roll located downline from the nip and being movable toward and away from a paper web to move its associated belt away from a paper web, one of said deflection rolls being spaced farther from the nip than the other of said deflection rolls, the belt associated with said one of said deflection rolls operable as a transfer belt to transfer said paper web to said unit downline;
a suction box located at the nip between said one of said deflection rolls and the transfer belt, the trailing edge of the suction box being rounded and the box being movable between operating and non-operating positions;
a third belt associated with said unit downline and overlapping said transfer belt.
2. A press section according to claim 1 wherein each of said pressing elements is a roll.
3. A press section according to claim 1 wherein one of said pressing elements is a roll and the other of said pressing elements is a press shoe and associated pressing belt.
4. A press section according to claim 1 wherein at least one of said two belts is a felt.
5. A press section according to claim 1 wherein at least one of said two belts is a mesh.
6. A press section according to any one of claims 1 through 5 wherein the paper web is guided along an essentially straight path between the press section and the unit downline.
7. A press section according to claim 6 wherein said deflection rolls are moved by means of pivot levers.
8. A press section according to any one of claims 1 through 5 wherein said deflection rolls are moved by means of pivot levers.
9. A press section according to claim 6 wherein said deflection rolls are moved by means of guide rails.
10. A press section according to any one of claims 1 through 5 wherein said deflection rolls are moved by means of guide rails.
11. A press section according to any one of claims 1, 2, 3, 4, 5, 7 and 9 wherein at least one of said deflection rolls has peripheral grooves.
12. A press section according to any one of claims 1 through 5 wherein the paper web is guided along an essentially straight path between the press section and the unit downline and at least one of said deflection rolls has peripheral grooves.
13. A press section according to any one of claims 1 through 5 wherein said deflection rolls are moved by means of pivot levers and at least one of said deflection rolls has peripheral grooves.
14. A press section according to claim 6 wherein said deflection rolls are moved by means of guide rails and at least one of said deflection rolls has peripheral grooves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4239360 | 1992-11-24 | ||
| DEP4239360 | 1992-11-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2109781A1 true CA2109781A1 (en) | 1994-05-25 |
Family
ID=6473454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002109781A Abandoned CA2109781A1 (en) | 1992-11-24 | 1993-11-23 | Press section for a paper machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0598991B1 (en) |
| JP (1) | JPH06220791A (en) |
| AT (1) | ATE133217T1 (en) |
| CA (1) | CA2109781A1 (en) |
| DE (1) | DE59301463D1 (en) |
| FI (1) | FI935201A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580423A (en) * | 1993-12-20 | 1996-12-03 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5776307A (en) * | 1993-12-20 | 1998-07-07 | The Procter & Gamble Company | Method of making wet pressed tissue paper with felts having selected permeabilities |
| US5795440A (en) * | 1993-12-20 | 1998-08-18 | The Procter & Gamble Company | Method of making wet pressed tissue paper |
| US5830316A (en) * | 1997-05-16 | 1998-11-03 | The Procter & Gamble Company | Method of wet pressing tissue paper with three felt layers |
| US5855739A (en) * | 1993-12-20 | 1999-01-05 | The Procter & Gamble Co. | Pressed paper web and method of making the same |
| US5861082A (en) * | 1993-12-20 | 1999-01-19 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US6103062A (en) * | 1998-10-01 | 2000-08-15 | The Procter & Gamble Company | Method of wet pressing tissue paper |
| CN112585318A (en) * | 2018-08-14 | 2021-03-30 | 福伊特专利有限公司 | Paper or board making machine and method for manufacturing a paper or board web |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19511988C1 (en) * | 1995-03-31 | 1996-08-01 | Voith Sulzer Papiermasch Gmbh | Paper mfg. press section for improved drainage and availability |
| SE511667C2 (en) * | 1998-03-16 | 1999-11-08 | Valmet Karlstad Ab | Paper machine and method for making a paper web |
| US6261415B1 (en) | 1998-08-28 | 2001-07-17 | Valmet Karlstad Ab | Paper machine |
| WO2000071812A1 (en) * | 1999-05-21 | 2000-11-30 | Valmet-Karlstad Ab | Press section with web stabilizing device |
| WO2000071813A1 (en) * | 1999-05-21 | 2000-11-30 | Valmet-Karlstad Ab | Press section with web stabilizing device |
| DE19963285A1 (en) * | 1999-12-27 | 2001-06-28 | Valmet Corp | Reliable device for temporary diversion of paper web, for press section of papermaking machine support conveyor, comprises rotary guide roller with suction zone, moving between two positions |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI81854C (en) * | 1982-09-15 | 1990-12-10 | Valmet Oy | PRESS SPRING WITH PRESS SHEET I EN PAPER MACHINERY. |
| DE3708191A1 (en) * | 1987-03-13 | 1988-09-22 | Voith Gmbh J M | WET PRESS |
| WO1991008339A1 (en) * | 1989-11-27 | 1991-06-13 | Beloit Corporation | A press section apparatus |
| DE4026021C2 (en) * | 1990-08-17 | 1995-10-12 | Voith Gmbh J M | Press section of a paper machine |
| FI96789C (en) * | 1990-11-23 | 1996-08-26 | Valmet Paper Machinery Inc | Method and apparatus for dewatering a paper web by pressing |
-
1993
- 1993-08-10 AT AT93112772T patent/ATE133217T1/en not_active IP Right Cessation
- 1993-08-10 DE DE59301463T patent/DE59301463D1/en not_active Expired - Fee Related
- 1993-08-10 EP EP93112772A patent/EP0598991B1/en not_active Expired - Lifetime
- 1993-11-23 FI FI935201A patent/FI935201A/en not_active Application Discontinuation
- 1993-11-23 CA CA002109781A patent/CA2109781A1/en not_active Abandoned
- 1993-11-24 JP JP5293513A patent/JPH06220791A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580423A (en) * | 1993-12-20 | 1996-12-03 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5637194A (en) * | 1993-12-20 | 1997-06-10 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5776307A (en) * | 1993-12-20 | 1998-07-07 | The Procter & Gamble Company | Method of making wet pressed tissue paper with felts having selected permeabilities |
| US5795440A (en) * | 1993-12-20 | 1998-08-18 | The Procter & Gamble Company | Method of making wet pressed tissue paper |
| US5846379A (en) * | 1993-12-20 | 1998-12-08 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5855739A (en) * | 1993-12-20 | 1999-01-05 | The Procter & Gamble Co. | Pressed paper web and method of making the same |
| US5861082A (en) * | 1993-12-20 | 1999-01-19 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5904811A (en) * | 1993-12-20 | 1999-05-18 | The Procter & Gamble Company | Wet pressed paper web and method of making the same |
| US5830316A (en) * | 1997-05-16 | 1998-11-03 | The Procter & Gamble Company | Method of wet pressing tissue paper with three felt layers |
| US6051105A (en) * | 1997-05-16 | 2000-04-18 | The Procter & Gamble Company | Method of wet pressing tissue paper with three felt layers |
| US6103062A (en) * | 1998-10-01 | 2000-08-15 | The Procter & Gamble Company | Method of wet pressing tissue paper |
| CN112585318A (en) * | 2018-08-14 | 2021-03-30 | 福伊特专利有限公司 | Paper or board making machine and method for manufacturing a paper or board web |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06220791A (en) | 1994-08-09 |
| EP0598991A1 (en) | 1994-06-01 |
| FI935201A0 (en) | 1993-11-23 |
| DE59301463D1 (en) | 1996-02-29 |
| EP0598991B1 (en) | 1996-01-17 |
| FI935201A (en) | 1994-05-25 |
| ATE133217T1 (en) | 1996-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19971124 |