CA2072955A1 - Inverted extended nip press apparatus - Google Patents
Inverted extended nip press apparatusInfo
- Publication number
- CA2072955A1 CA2072955A1 CA 2072955 CA2072955A CA2072955A1 CA 2072955 A1 CA2072955 A1 CA 2072955A1 CA 2072955 CA2072955 CA 2072955 CA 2072955 A CA2072955 A CA 2072955A CA 2072955 A1 CA2072955 A1 CA 2072955A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- nip
- felt
- roll
- press
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A press apparatus is disclosed for pressing a moving web formed on a forming wire. The apparatus includes a frame and a first plurality of rolls rotatably secured to the frame. A first continuous felt extends around the first plurality of rolls which include a pick-up roll disposed adjacent to the wire for transferring the web from the wire onto the first felt. The first plurality of rolls also includes a first press roll which is disposed downstream relative to the pick-up roll. A second continuous felt extends. around a second plurality of rolls with the second felt cooperating with the first felt. The second plurality of rolls includes a second press roll which cooperates with the first press roll for defining therebetween a first nip.
The web is urged against the first felt when the web emerges from the first nip and the first felt and web supported beneath the first felt pass through a second nip defined by an extended nip press disposed downstream relative to the first nip.
A press apparatus is disclosed for pressing a moving web formed on a forming wire. The apparatus includes a frame and a first plurality of rolls rotatably secured to the frame. A first continuous felt extends around the first plurality of rolls which include a pick-up roll disposed adjacent to the wire for transferring the web from the wire onto the first felt. The first plurality of rolls also includes a first press roll which is disposed downstream relative to the pick-up roll. A second continuous felt extends. around a second plurality of rolls with the second felt cooperating with the first felt. The second plurality of rolls includes a second press roll which cooperates with the first press roll for defining therebetween a first nip.
The web is urged against the first felt when the web emerges from the first nip and the first felt and web supported beneath the first felt pass through a second nip defined by an extended nip press disposed downstream relative to the first nip.
Description
- ` FB344331680US
.. . .. . . . . .
.. . .. . . . . .
2~72~55 PATENT APPLICATION
TITLlE~ V~TED EXTE~ D NIP P~ S APPARaTiJS
BACR5~ROUND OF ~ IV~TION
FIEI.I) OF ~E INV~al~O~
This invention relates to a press apparatus for pressing a moving web formed on a forming wire. More particularly, this invention relates to a press apparatus including a first nip defined by cooperating press rolls and a second nip defined by an extended nip press with a first felt extending through both nips.
INFORMATION DISCLOSURE STAT13!~
In a press section of a papermaking machine, an impor~tant object is to remove as much water from the web as possible without damagins the formation~ or crushing the web. It is a well-known fact that with every additional removal of even a fract~on of a percent of water from the web, great savings in energy are accomplished. The water which is not removed in the press must subsequently be removed thermally in a downstream dryer drum section of the paper machine, and the energy requirements for the removal of a unit of water by evaporation greatly exceed the energy requirements for removal of the same unit of water by pressing.
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20729~
In U.S. Patent No . 4, 561,939 to E. J. Justus, assigned to Beloit Corporation, there is described a first dewatering nip defined by a pair of cooperating press rolls followed by an extended nip press. This patent discloses a pair o lower felts for transporting the formed web between the first and second nip. However, a suction roll or the like is re~uired in order to transfer the formed web from the first lower elt to the second upper felt pxior to the web being transported between the second upper felt and the second lower felt. The web, conseguently, is not supported by either of the lower felts for a certain portion of the travel between the first and second nips. Also, during suction transfer from one felt to the next, water is transferred back into the sheet from the preceding felt.
The present invention provides means for supporting the web on an upper felt throughout the travel of the web between the first and second~nip, thereby providing a "no draw press" and eliminating the need for the transfer suction~- roll of the aforementioned second upper felt of the Justus patent.
U.S. Patent No. 3,023,805 to Walker teaches a single lower felt extending between a first and a second nip;
however, the second nip is not an extended nip press.
Furthermore, in the present invention, by the provision of a yrooved blanket in the extended nip press, the need for a lower felt is eliminated.
- ~ FB344331680US
2~72~
Additionally, U.S. Patent No. 4,704,192 shows, in Figure 1 thereof, a lower felt extending through a roll couple and an extended nip with a smooth surfaced backing roll. However, such reference does not teach an inverted nip with the attendant advantage thereof for transferring the web into the dryer section.
Therefore, it is a primary objective of the present invention to provide a press apparatus that overcomes the aforementioned inadeguacies of the prior art proposals and which provides a press apparatus that contributes a significant improvement to the art of pressing a moving web that has been formed on a forming wire.
Another object of the present invention is the provision of a press apparatus having a first nip defined by a pair of cooperating press rolls and a second nip defined ~by an inverted extended nip press, the web being-supported between these nips by means of a felt which passes through both of the aforementioned nips.
Another objective of the present invention is the provision of a press apparatus in which the second nip is defined by an inverted extended nip press having a grooved blanket which eliminates the need for having double felting of the extended nip press.
` ` ` ' ' ' ` ' ~7295~
Other objects and advantages of the present invention will be apparent to those skilled in the art by a consideration of the following description including the claims taken together with the annexed drawing.
S~MM~RY OF ~1~ INVENTION
The present invention relates to a press apparatus and a method for pressing a moving web formed on a forming wire.
The apparatus includes a frame and a irst plurality of rolls rotatably secured to the frame. A first continuous felt extends around the first plurality of rolls which includes a first press roll. A second plurality o~ rolls are rotatably secured to the frame and a second continuous felt extends around the second plurality of rolls with the second felt cooperating with the first felt. The second plurality of rolls includes a second press roll which cooperates with the first press roll for defining therebetween a first nip such tha~ when the web moves_ towards the first nip, the web is pressed between the first and second felts during passage through the first nip. The web is urged ag~inst the first felt when the pressed web emerges from the first nip such that the web is supported by the first felt when the first and second felts diverge relative to each other. An inverted extended nip pr~ss means is disposed downstream relative to the first nip for imparting further dewatering to the web when the web supported beneath the first felt passes through a second nip defined by the extended nip press means.
20729~
In the present invention, the inverted extended nip press includes a grooved ~lanket which eliminates the need for double felting of the extended nip press because as the grooved blanket, the first felt and the web supported beneath the first felt pass through the second nip, most of the water removed from the web passes through the first felt into the grooves of the blanket.
In the preferred emhodiment of the present invention, the first press roll is a suction roll for urging the emerging web against the first felt.
The present invention includes many alternative arrangements and modifications which will be apparent to those skilled in the artO The present invention is not limited to the embo*iment described hereinafter, which embodiment is merel-~ illustrative of the present invention.
Rather, the present invention is defined by the appended claims which define the scope of the present invention.
BRIEF D~SCRIPTIO~ OF T~E DRAWq~G
The drawing is a side-elevational view of a press apparatus, according to the present invention, with the inverted extended nip press having no lower felt.
~ . ~. . . FB344331680US
2~72~
D:eTAILE:D DESCRIPT:I:ON OE' TEIE: DRAWING
The drawing shows a press apparatus generally designated lO for pressing a moving web Wr shown as a dashed line, formed on a forming wire F. The apparatus 10 includes a frame 12 and a first plurality of rolls 14,15,16,17~18,19, and 21. A first continuous felt 22 extends around the first plurality of rolls 14 to 21. The first plurality of rolls 14 to 21 includes a pick-up roll 14 which is a suction roll. The roll 14 is disposed adjacent to the wire F. The pick-up roll 14 and wire F cooperate together such that when the web W passes between the wire F and the pick-up roll 14, the web W is transferred from the wire F onto the first felt 22. The roll 15 is a first suction press roll and is disposed downstream relative to the pick-up roll 14. A
second plurality of rolls 26,27,28,29,30,31,32,33,34 and 35 are rotatably secured to the frame 12. A second continuous felt ~8 extends around the second plurality of rolls 26 to with the second felt 38 cooperating with the first felt 22 such that the web W is supported by the first and second felts 22 and 38, respectively, when the web W moves between the pick-up roll 14 and the first press roll 15. The roll 26 is a second press roll which cooperates with the first press roll 15 for defining therebetween a first nip Nl such that when the web W moves from the pick-up roll 14 and between the first and second felts 22 and 38, respectively, towards the first nip N1, the.web W is pressed between the first and second felts 22 and 38, respectively, during passage through the first nip N1.
FB344331680US~
207~9~
In the embodiment shown in the drawing, the first or second press rolls 15 and 26 may be grooved, suction or plain rolls, or a combination thereof.
As shown in the drawing, a steam box 40 and suction shoe 41 are disposed on opposite sides o the first felt 22 and web downstream relative to the nip Nl of urging the web W against the first felt 22 when the web emerges from the first nip N1. The aforementioned arrangement permits the web W to be supported beneath the first felt 22 when the first and second felts 22 and 38 diverge relative to each other. An extended nip press means, generally designated 42, is disposed downstream relative to the first nip N1 for further dewatering the web W when the web W supported beneath the first felt 22 passes through a second nip ~2 defined by the inverted extended nip press means 42. The ~tended nip press means.42 includes a plain roll 44 and a shoe 46 having a concave surface 4B whi.ch cooperates with the roll 44. for defining the nip N2. Furthermore, the extended. nip press includes means 50 for urging the shoe.46 against a grooved blanket 52 such that the first felt 22 is disposed between the blanket S2 and the web W during.passage of the blanket, felt and web 52,22 and W, respectively, through the nip N2. The blanket 52 is grooved on the surface disposed adjacent to the felt 22 as fully disclosed in U.S. Patent Nos. 4,908,103 and 4,978,428 to Cronin et al.
All the disclosure of U.S. Patent Nos. 4,908,103 and 4,978,428 is incorporated herein by reference.
, ~72~5 Additionally, the web W emerging from the nip N2 diverges relative to the first felt 22 and is thereafter guided around a roll 54 into a single tier, top-felted BEL-CH~MP dryer section, generally designated 56, for drying alternate sides of the web. BEL-CHAMP is a registered trademark of Beloit Corporation, and the BEL-CHAMP concept is disclosed ~n U.S. Patent No. 4,934,067 to Wedel et al.
All the disclosure of U.S. Patent No. 4,934,067 to Wedel e~
al is incorporated herein by reference.
In operation of the embodiment of the present invention, the formed web is transferred from the forming wire to a first felt by means of a pick-up roll, which is a suction roll. The web is conveyed towards a first nip, which is defined by a first and second press roll, such that a portion of the water within the web is removed from the web during passage of the web through the first nip. The first and second felts diverge relative to each other after emerging from the first nip, and a steam box and cooperating vacuum shoe are used to decrease the viscosity of water remaining in the web downstream relative to the nip Nl such that removal of such remaining water during passage of the web through N2 is facilitated.
The dewatered web emerging from the nip N2 diverges relative to the first felt 22 and is guided around a lead-in roll 54 of a single tier BEL-CHAMP dryer section, generally designated 56.
- ~FB344331680US
207~9~5 The smooth surface of the roll 44 imparts a smooth, printable surface to the side 58 of the pressed web or linerboard.
When the press, according to the present invention, is used for the manufacture of linerboard, the resultant linexboard may~ be readily printed on one side thereof and subse~uently converted into cartons or the like.
Many modifications and variations of the present invention will be readily apparent to the those skilled in the art. However, such variations and modifications fall within the spirit and scope of the present invention as defined by the appended claims.
Included amongst such modifications would be the continued support of the web W downstream relative to the nip N2 for a portion of the peripheral- surface of the roll 44 in order to further stabilize the pressed web or board on exiting the inverted extended nip press means.
Also, the present invention envisages an arrangement in which the roll 44 is heated by means of an induction heater or the li~e such that the web or board is subjected to a rapid increase in temperature and pressure and residence time during passage through the nip N2.
- i - FB344331680US
, ~729~
By inverting the extended nip 42, threading of the web from the press section into the dryer section 56 is greatly facilitated, and the provision of a broke pit beneath the roll 44 and a tail cutter disposed upstream relative to the nip N2 simplifies the dryer threading operation.
The present invention greatly simplifies and reduces the cost of providing a dew~tering press by eliminating the need for any transfer rolls for trans~erring the web between adjacent lower felts between the first and second nips.
Also, the arranyement avoids the additional cost of providing two lower felts between the first and second nips.
Additionally, the problem of rewetting during transfer of the web to a second lower felt is inhibited and difficulties experienced with the prior open draw arrangements are avoided. Furthermore by utilizing a grooved blanket, th~
necessity for a lower felt or double felting for the extended nip press is eliminated.
Although in the past it may have appeared unviable to use a single upper-felt for running through the first nip and then through an extended nip press because generally it was considered that such an arrangement would cause overloading of the upper felt, the foregoing arrangement has been found to operate extremely satisfactorily when combined with a grooved blanket.
TITLlE~ V~TED EXTE~ D NIP P~ S APPARaTiJS
BACR5~ROUND OF ~ IV~TION
FIEI.I) OF ~E INV~al~O~
This invention relates to a press apparatus for pressing a moving web formed on a forming wire. More particularly, this invention relates to a press apparatus including a first nip defined by cooperating press rolls and a second nip defined by an extended nip press with a first felt extending through both nips.
INFORMATION DISCLOSURE STAT13!~
In a press section of a papermaking machine, an impor~tant object is to remove as much water from the web as possible without damagins the formation~ or crushing the web. It is a well-known fact that with every additional removal of even a fract~on of a percent of water from the web, great savings in energy are accomplished. The water which is not removed in the press must subsequently be removed thermally in a downstream dryer drum section of the paper machine, and the energy requirements for the removal of a unit of water by evaporation greatly exceed the energy requirements for removal of the same unit of water by pressing.
:
.
' ~: , , ,. ~
20729~
In U.S. Patent No . 4, 561,939 to E. J. Justus, assigned to Beloit Corporation, there is described a first dewatering nip defined by a pair of cooperating press rolls followed by an extended nip press. This patent discloses a pair o lower felts for transporting the formed web between the first and second nip. However, a suction roll or the like is re~uired in order to transfer the formed web from the first lower elt to the second upper felt pxior to the web being transported between the second upper felt and the second lower felt. The web, conseguently, is not supported by either of the lower felts for a certain portion of the travel between the first and second nips. Also, during suction transfer from one felt to the next, water is transferred back into the sheet from the preceding felt.
The present invention provides means for supporting the web on an upper felt throughout the travel of the web between the first and second~nip, thereby providing a "no draw press" and eliminating the need for the transfer suction~- roll of the aforementioned second upper felt of the Justus patent.
U.S. Patent No. 3,023,805 to Walker teaches a single lower felt extending between a first and a second nip;
however, the second nip is not an extended nip press.
Furthermore, in the present invention, by the provision of a yrooved blanket in the extended nip press, the need for a lower felt is eliminated.
- ~ FB344331680US
2~72~
Additionally, U.S. Patent No. 4,704,192 shows, in Figure 1 thereof, a lower felt extending through a roll couple and an extended nip with a smooth surfaced backing roll. However, such reference does not teach an inverted nip with the attendant advantage thereof for transferring the web into the dryer section.
Therefore, it is a primary objective of the present invention to provide a press apparatus that overcomes the aforementioned inadeguacies of the prior art proposals and which provides a press apparatus that contributes a significant improvement to the art of pressing a moving web that has been formed on a forming wire.
Another object of the present invention is the provision of a press apparatus having a first nip defined by a pair of cooperating press rolls and a second nip defined ~by an inverted extended nip press, the web being-supported between these nips by means of a felt which passes through both of the aforementioned nips.
Another objective of the present invention is the provision of a press apparatus in which the second nip is defined by an inverted extended nip press having a grooved blanket which eliminates the need for having double felting of the extended nip press.
` ` ` ' ' ' ` ' ~7295~
Other objects and advantages of the present invention will be apparent to those skilled in the art by a consideration of the following description including the claims taken together with the annexed drawing.
S~MM~RY OF ~1~ INVENTION
The present invention relates to a press apparatus and a method for pressing a moving web formed on a forming wire.
The apparatus includes a frame and a irst plurality of rolls rotatably secured to the frame. A first continuous felt extends around the first plurality of rolls which includes a first press roll. A second plurality o~ rolls are rotatably secured to the frame and a second continuous felt extends around the second plurality of rolls with the second felt cooperating with the first felt. The second plurality of rolls includes a second press roll which cooperates with the first press roll for defining therebetween a first nip such tha~ when the web moves_ towards the first nip, the web is pressed between the first and second felts during passage through the first nip. The web is urged ag~inst the first felt when the pressed web emerges from the first nip such that the web is supported by the first felt when the first and second felts diverge relative to each other. An inverted extended nip pr~ss means is disposed downstream relative to the first nip for imparting further dewatering to the web when the web supported beneath the first felt passes through a second nip defined by the extended nip press means.
20729~
In the present invention, the inverted extended nip press includes a grooved ~lanket which eliminates the need for double felting of the extended nip press because as the grooved blanket, the first felt and the web supported beneath the first felt pass through the second nip, most of the water removed from the web passes through the first felt into the grooves of the blanket.
In the preferred emhodiment of the present invention, the first press roll is a suction roll for urging the emerging web against the first felt.
The present invention includes many alternative arrangements and modifications which will be apparent to those skilled in the artO The present invention is not limited to the embo*iment described hereinafter, which embodiment is merel-~ illustrative of the present invention.
Rather, the present invention is defined by the appended claims which define the scope of the present invention.
BRIEF D~SCRIPTIO~ OF T~E DRAWq~G
The drawing is a side-elevational view of a press apparatus, according to the present invention, with the inverted extended nip press having no lower felt.
~ . ~. . . FB344331680US
2~72~
D:eTAILE:D DESCRIPT:I:ON OE' TEIE: DRAWING
The drawing shows a press apparatus generally designated lO for pressing a moving web Wr shown as a dashed line, formed on a forming wire F. The apparatus 10 includes a frame 12 and a first plurality of rolls 14,15,16,17~18,19, and 21. A first continuous felt 22 extends around the first plurality of rolls 14 to 21. The first plurality of rolls 14 to 21 includes a pick-up roll 14 which is a suction roll. The roll 14 is disposed adjacent to the wire F. The pick-up roll 14 and wire F cooperate together such that when the web W passes between the wire F and the pick-up roll 14, the web W is transferred from the wire F onto the first felt 22. The roll 15 is a first suction press roll and is disposed downstream relative to the pick-up roll 14. A
second plurality of rolls 26,27,28,29,30,31,32,33,34 and 35 are rotatably secured to the frame 12. A second continuous felt ~8 extends around the second plurality of rolls 26 to with the second felt 38 cooperating with the first felt 22 such that the web W is supported by the first and second felts 22 and 38, respectively, when the web W moves between the pick-up roll 14 and the first press roll 15. The roll 26 is a second press roll which cooperates with the first press roll 15 for defining therebetween a first nip Nl such that when the web W moves from the pick-up roll 14 and between the first and second felts 22 and 38, respectively, towards the first nip N1, the.web W is pressed between the first and second felts 22 and 38, respectively, during passage through the first nip N1.
FB344331680US~
207~9~
In the embodiment shown in the drawing, the first or second press rolls 15 and 26 may be grooved, suction or plain rolls, or a combination thereof.
As shown in the drawing, a steam box 40 and suction shoe 41 are disposed on opposite sides o the first felt 22 and web downstream relative to the nip Nl of urging the web W against the first felt 22 when the web emerges from the first nip N1. The aforementioned arrangement permits the web W to be supported beneath the first felt 22 when the first and second felts 22 and 38 diverge relative to each other. An extended nip press means, generally designated 42, is disposed downstream relative to the first nip N1 for further dewatering the web W when the web W supported beneath the first felt 22 passes through a second nip ~2 defined by the inverted extended nip press means 42. The ~tended nip press means.42 includes a plain roll 44 and a shoe 46 having a concave surface 4B whi.ch cooperates with the roll 44. for defining the nip N2. Furthermore, the extended. nip press includes means 50 for urging the shoe.46 against a grooved blanket 52 such that the first felt 22 is disposed between the blanket S2 and the web W during.passage of the blanket, felt and web 52,22 and W, respectively, through the nip N2. The blanket 52 is grooved on the surface disposed adjacent to the felt 22 as fully disclosed in U.S. Patent Nos. 4,908,103 and 4,978,428 to Cronin et al.
All the disclosure of U.S. Patent Nos. 4,908,103 and 4,978,428 is incorporated herein by reference.
, ~72~5 Additionally, the web W emerging from the nip N2 diverges relative to the first felt 22 and is thereafter guided around a roll 54 into a single tier, top-felted BEL-CH~MP dryer section, generally designated 56, for drying alternate sides of the web. BEL-CHAMP is a registered trademark of Beloit Corporation, and the BEL-CHAMP concept is disclosed ~n U.S. Patent No. 4,934,067 to Wedel et al.
All the disclosure of U.S. Patent No. 4,934,067 to Wedel e~
al is incorporated herein by reference.
In operation of the embodiment of the present invention, the formed web is transferred from the forming wire to a first felt by means of a pick-up roll, which is a suction roll. The web is conveyed towards a first nip, which is defined by a first and second press roll, such that a portion of the water within the web is removed from the web during passage of the web through the first nip. The first and second felts diverge relative to each other after emerging from the first nip, and a steam box and cooperating vacuum shoe are used to decrease the viscosity of water remaining in the web downstream relative to the nip Nl such that removal of such remaining water during passage of the web through N2 is facilitated.
The dewatered web emerging from the nip N2 diverges relative to the first felt 22 and is guided around a lead-in roll 54 of a single tier BEL-CHAMP dryer section, generally designated 56.
- ~FB344331680US
207~9~5 The smooth surface of the roll 44 imparts a smooth, printable surface to the side 58 of the pressed web or linerboard.
When the press, according to the present invention, is used for the manufacture of linerboard, the resultant linexboard may~ be readily printed on one side thereof and subse~uently converted into cartons or the like.
Many modifications and variations of the present invention will be readily apparent to the those skilled in the art. However, such variations and modifications fall within the spirit and scope of the present invention as defined by the appended claims.
Included amongst such modifications would be the continued support of the web W downstream relative to the nip N2 for a portion of the peripheral- surface of the roll 44 in order to further stabilize the pressed web or board on exiting the inverted extended nip press means.
Also, the present invention envisages an arrangement in which the roll 44 is heated by means of an induction heater or the li~e such that the web or board is subjected to a rapid increase in temperature and pressure and residence time during passage through the nip N2.
- i - FB344331680US
, ~729~
By inverting the extended nip 42, threading of the web from the press section into the dryer section 56 is greatly facilitated, and the provision of a broke pit beneath the roll 44 and a tail cutter disposed upstream relative to the nip N2 simplifies the dryer threading operation.
The present invention greatly simplifies and reduces the cost of providing a dew~tering press by eliminating the need for any transfer rolls for trans~erring the web between adjacent lower felts between the first and second nips.
Also, the arranyement avoids the additional cost of providing two lower felts between the first and second nips.
Additionally, the problem of rewetting during transfer of the web to a second lower felt is inhibited and difficulties experienced with the prior open draw arrangements are avoided. Furthermore by utilizing a grooved blanket, th~
necessity for a lower felt or double felting for the extended nip press is eliminated.
Although in the past it may have appeared unviable to use a single upper-felt for running through the first nip and then through an extended nip press because generally it was considered that such an arrangement would cause overloading of the upper felt, the foregoing arrangement has been found to operate extremely satisfactorily when combined with a grooved blanket.
Claims (12)
1. A press apparatus for pressing a moving web formed on a forming wire, said apparatus comprising:
a frame;
a first plurality of rolls rotatably secured to said frame;
a first continuous felt extending around said first plurality of rolls;
said first plurality of rolls including:
a first press roll;
a second plurality of rolls rotatably secured to said frame;
a second continuous felt extending around said second plurality of rolls;
said second plurality of rolls including:
a second press roll cooperating with said first press roll for defining therebetween a first nip such that the web is pressed between said first and second felts during passage through said first nip;
means for urging the web against said first felt when the pressed web emerges from said first nip such that the web is supported beneath said first felt when said first and second felts diverge relative to each other; and an inverted extended nip press means disposed downstream relative to said first nip for further dewatering the web when the web supported beneath said first felt passes through a second nip defined by said extended nip press means.
a frame;
a first plurality of rolls rotatably secured to said frame;
a first continuous felt extending around said first plurality of rolls;
said first plurality of rolls including:
a first press roll;
a second plurality of rolls rotatably secured to said frame;
a second continuous felt extending around said second plurality of rolls;
said second plurality of rolls including:
a second press roll cooperating with said first press roll for defining therebetween a first nip such that the web is pressed between said first and second felts during passage through said first nip;
means for urging the web against said first felt when the pressed web emerges from said first nip such that the web is supported beneath said first felt when said first and second felts diverge relative to each other; and an inverted extended nip press means disposed downstream relative to said first nip for further dewatering the web when the web supported beneath said first felt passes through a second nip defined by said extended nip press means.
2. A press apparatus as set forth in claim 1 wherein said first press roll is a suction roll.
3. A press apparatus as set forth in claim 1 wherein said first press roll is a grooved roll.
4. A press apparatus as set forth in claim 1 wherein said first press roll is a plain roll.
5. A press apparatus as set forth in claim 1 wherein said first plurality of rolls further includes:
a pick-up roll disposed adjacent to the wire, said pick-up roll and wire cooperating together such that when the web passes between the wire and said pick-up roll, the web is transferred from the wire onto said first felt;
said first press roll being disposed downstream relative to said pick-up roll such that when the web moves from said pick-up roll towards said first nip, the web is pressed between said first and second felts during passage through said first nip.
a pick-up roll disposed adjacent to the wire, said pick-up roll and wire cooperating together such that when the web passes between the wire and said pick-up roll, the web is transferred from the wire onto said first felt;
said first press roll being disposed downstream relative to said pick-up roll such that when the web moves from said pick-up roll towards said first nip, the web is pressed between said first and second felts during passage through said first nip.
6. A press apparatus as set forth in claim 5 wherein said first and second felts support the web along the entire distance between said pick-up roll and said first nip.
7. A press apparatus as set forth in claim 1 wherein said second press roll is a grooved roll.
8. A press apparatus as set forth in claim 1 further including:
steam box means for applying steam to the web;
a suction shoe disposed on the opposite side of the web and first felt relative to said steam box for applying suction through said first felt after the web has passed through said first nip.
steam box means for applying steam to the web;
a suction shoe disposed on the opposite side of the web and first felt relative to said steam box for applying suction through said first felt after the web has passed through said first nip.
9. A press apparatus as set forth in claim 1 wherein said inverted extended nip press means includes:
a third press roll defining a smooth outer surface for direct surface contact with one side of the web;
a shoe defining a concave surface such that said concave surface cooperates with said third press roll for defining therebetween said second nip;
means for urging said shoe toward said third press roll;
a continuous blanket extending through said second nip such that when said blanket, said first felt and the web pass through said second nip, said first felt is disposed between said blanket and the web.
a third press roll defining a smooth outer surface for direct surface contact with one side of the web;
a shoe defining a concave surface such that said concave surface cooperates with said third press roll for defining therebetween said second nip;
means for urging said shoe toward said third press roll;
a continuous blanket extending through said second nip such that when said blanket, said first felt and the web pass through said second nip, said first felt is disposed between said blanket and the web.
10. A press apparatus as set forth in claim 9 wherein said blanket has a surface which is pressed against said first felt during passage of said blanket and said first felt through said second nip, said surface being vented for the reception therein of water removed from the web when the web passes through said second nip.
11. A press apparatus for pressing a moving web formed on a forming wire, said apparatus comprising:
a frame;
a first plurality of rolls rotatably secured to said frame;
a first continuous felt extending around said first plurality of rolls;
said first plurality of rolls including:
a pick-up roll disposed adjacent to the wire, said pick-up roll and wire cooperating together such that when the web passes between the wire and the pick-up roll, the web is transferred from the wire onto said first felt;
a first press roll disposed downstream relative to said pick-up roll;
a second plurality of rolls rotatably secured to said frame;
a second continuous felt extending around said second plurality of rolls;
said second felt cooperating with said first felt such that the web is supported by and between said first and second felts from said pick-up roll to said first press roll;
said second plurality of rolls including:
a second press roll cooperating with said first press roll for defining therebetween a first nip such that when the web moves from said pick-up roll and between said first and second felts toward said first nip, the web is pressed between said first and second felts during passage through said first nip;
means for urging the web against said first felt when the pressed web emerges from said first nip such that the web is supported by said first felt when said first and second felts diverge relative to each other;
an inverted extended nip press means disposed downstream relative to said first nip for further dewatering the web when the web supported by said first felt passes through a second nip defined by said extended nip press means;
said extended nip press means including:
a third press roll having a smooth surface which comes into direct surface contact with one side of the web;
a shoe defining a concave surface such that said concave surface cooperates with said third press roll for defining therebetween said second nip;
means for urging said shoe towards said third press roll;
a continuous blanket extending through said second nip such that when said blanket, said first felt and the web pass through said second nip, said first felt is disposed between said blanket and the web; and said blanket having a surface which is pressed against said first felt during passage of said blanket and first felt through said second nip, said surface defining a plurality of grooves for the reception therein of water removed from the web when the web passes through said second nip.
a frame;
a first plurality of rolls rotatably secured to said frame;
a first continuous felt extending around said first plurality of rolls;
said first plurality of rolls including:
a pick-up roll disposed adjacent to the wire, said pick-up roll and wire cooperating together such that when the web passes between the wire and the pick-up roll, the web is transferred from the wire onto said first felt;
a first press roll disposed downstream relative to said pick-up roll;
a second plurality of rolls rotatably secured to said frame;
a second continuous felt extending around said second plurality of rolls;
said second felt cooperating with said first felt such that the web is supported by and between said first and second felts from said pick-up roll to said first press roll;
said second plurality of rolls including:
a second press roll cooperating with said first press roll for defining therebetween a first nip such that when the web moves from said pick-up roll and between said first and second felts toward said first nip, the web is pressed between said first and second felts during passage through said first nip;
means for urging the web against said first felt when the pressed web emerges from said first nip such that the web is supported by said first felt when said first and second felts diverge relative to each other;
an inverted extended nip press means disposed downstream relative to said first nip for further dewatering the web when the web supported by said first felt passes through a second nip defined by said extended nip press means;
said extended nip press means including:
a third press roll having a smooth surface which comes into direct surface contact with one side of the web;
a shoe defining a concave surface such that said concave surface cooperates with said third press roll for defining therebetween said second nip;
means for urging said shoe towards said third press roll;
a continuous blanket extending through said second nip such that when said blanket, said first felt and the web pass through said second nip, said first felt is disposed between said blanket and the web; and said blanket having a surface which is pressed against said first felt during passage of said blanket and first felt through said second nip, said surface defining a plurality of grooves for the reception therein of water removed from the web when the web passes through said second nip.
12. A method of pressing a moving web which has been formed on a forming wire, the method comprising the steps of:
transferring the formed web from the forming wire to a first continuous felt by means of a pick-up roll;
transporting the formed web between the first felt and a cooperating second felt from the pick-up roll to a first nip;
leading the formed web disposed between the first and second felts towards the first nip defined by a first and second press roll;
pressing the formed web between the cooperating press rolls for removing a portion of water from the formed web;
urging the formed web emerging from the first nip against the first felt;
conducting the formed web supported beneath the first felt towards a second nip defined by an extended nip press; and pressing the first felt and web supported beneath the first felt as the web and first felt pass together through the second nip for imparting to the web a further dewatering.
transferring the formed web from the forming wire to a first continuous felt by means of a pick-up roll;
transporting the formed web between the first felt and a cooperating second felt from the pick-up roll to a first nip;
leading the formed web disposed between the first and second felts towards the first nip defined by a first and second press roll;
pressing the formed web between the cooperating press rolls for removing a portion of water from the formed web;
urging the formed web emerging from the first nip against the first felt;
conducting the formed web supported beneath the first felt towards a second nip defined by an extended nip press; and pressing the first felt and web supported beneath the first felt as the web and first felt pass together through the second nip for imparting to the web a further dewatering.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US740,738 | 1985-06-03 | ||
| US74073891A | 1991-08-06 | 1991-08-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2072955A1 true CA2072955A1 (en) | 1993-02-07 |
Family
ID=24977847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2072955 Abandoned CA2072955A1 (en) | 1991-08-06 | 1992-07-02 | Inverted extended nip press apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (2) | JPH05214692A (en) |
| CA (1) | CA2072955A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE533043C2 (en) * | 2008-09-17 | 2010-06-15 | Metso Paper Karlstad Ab | tissue Paper Machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257203U (en) * | 1975-10-22 | 1977-04-25 | ||
| BR8607142A (en) * | 1986-04-29 | 1988-04-19 | Beloit Corp | APPLIANCE FOR PRESSING A MOBILE BLANK FORMED ON A WIRE FORMATION |
| US4879001A (en) * | 1988-09-12 | 1989-11-07 | Beloit Corporation | Twin wire former with roll press followed by extended nip press |
-
1992
- 1992-07-02 CA CA 2072955 patent/CA2072955A1/en not_active Abandoned
- 1992-07-30 JP JP20337292A patent/JPH05214692A/en active Pending
-
1996
- 1996-01-08 JP JP1496U patent/JPH081337U/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05214692A (en) | 1993-08-24 |
| JPH081337U (en) | 1996-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |