CA2118143A1 - Twin-wire former for a paper machine - Google Patents
Twin-wire former for a paper machineInfo
- Publication number
- CA2118143A1 CA2118143A1 CA 2118143 CA2118143A CA2118143A1 CA 2118143 A1 CA2118143 A1 CA 2118143A1 CA 2118143 CA2118143 CA 2118143 CA 2118143 A CA2118143 A CA 2118143A CA 2118143 A1 CA2118143 A1 CA 2118143A1
- Authority
- CA
- Canada
- Prior art keywords
- wire
- slats
- suction box
- dewatering
- vacuum
- 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
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Landscapes
- Paper (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A twin-wire former for a paper machine with a first and a second wire, each forming a wire loop, and with a plurality of dewatering slats within the two wire loops.
The slats of the first wire bear on the inside surface of the first wire (first slats), and the slats of the second wire bear on the inside surface of the second wire (second slats). The slats are arranged in groups within suction boxes, each suction box being connectable to a vacuum. The suction boxes of the two wires are opposed, overlapping at least partly. Each suction box can be connected--indirectly or directly--to a vacuum, the vacuum being adjustable to the effect that the wire is always wetted by the wire water within the respective suction box.
A twin-wire former for a paper machine with a first and a second wire, each forming a wire loop, and with a plurality of dewatering slats within the two wire loops.
The slats of the first wire bear on the inside surface of the first wire (first slats), and the slats of the second wire bear on the inside surface of the second wire (second slats). The slats are arranged in groups within suction boxes, each suction box being connectable to a vacuum. The suction boxes of the two wires are opposed, overlapping at least partly. Each suction box can be connected--indirectly or directly--to a vacuum, the vacuum being adjustable to the effect that the wire is always wetted by the wire water within the respective suction box.
Description
2~ 3 ;~
Dieter Egelhof Volker Schmidt-Rohr `' "' "i`'`": "' TWIN-WIRE FORMER FOR A PAPER MACHINE
BACKGROUND OF THE INVENTION - -The invention concerns a twin-wire former for a paper machine. Regarding the prior art, reference is made to the following documents: ;- s (1) DE-PS 68 28 94 (2) WO 91/01408 i~; -(3) US 5,045,153 (4) DE-PS 20 23 521 The invention described in the U.S. Patent 5,045,153 includes slats arranged in both wire loops. The slats ~ ;;, ;
within one wire loop are arranged so as to oppose the slats within the other wire loop. The slat~ of the one -~
and also the other group may be contained within suction ;
. , -boxes, since these apply a vacuum on the entire area of the slats in order to thereby enhance the dewatering.
The suction boxQs feature appropriate suction hookups acros~ which a vacuum is applied in order to remove the ~-,,~ . , ::
water from the boxes. In this removal of wire water, or filtrat-, the suction boxes are not, or only partly, ;~
filled with water.
Paper manufacturers deslre to produce a paper which ` ~
is homogeneous in any respect. It should feature a `~`
, ,, ,. : . ':: . ;:; ;
uniform profile both across the web width, as regards its ~;;
::: ": "
thickness, and also its composition of material. It shouId also have consistent properties in the machine ;~;
'~li8~43 ~ ~
r~ ~
-2- ~ ~;
direction. For that purpose, great efforts are undertaken to provide, especially in the area of sheet formation, i-e-, on the twin-wire former, all of the prereguisites for a good paper web quality in the above sense. Nonetheless, this has not yet been mastered completely.
Thus, the problem underlying the present invention i8 to provide a twin-wire former that meets the prerequisites for a paper web which is consistent in any respect. - -SUMMARY OF THE INVENTION
This problem is solved by the combination of the features of the present invention. The present invention comprises, in one form thereof, a twin-wire former for a paper machine having a first and a second wire, each ~ ;
forming a wire loop, and with a plurality of dewatering slats within the two wire loops. The slats of the first wire bear on the inside surface of the first wire (first -~
slats), and the slats of the second wire bear on the inside surface of the second wire (second slats). The slats are arranged in groups within suction boxes, each suctionibox being connectable to a vacuum.' The sucti!on boxes of the two wires are opposed, overlapping at least partly. Each suction box can be connected--indirectly or directly--to a vacuum, the vacuum being adjustable to the effect that the wire is always wetted by the wire water wlthin the respective suction box. -'','`'~'''`'~
'~ "' '.': ' .~
::~, :.. :.
:.: ...: :.;, . ;..:
21~ gl~3 ,~ ,.
.... .
-3- ~ ~
The inventors have recognized that the i afor~mentioned dewatering boxes during the operation of -the paper machine are not, or not completely, filled with wire water. The wire water level within ths suction box can fluctuate quite considerably during operation. There may be phases in which the level is nearly at the bottom of the box, and there may be such in which it more or less touches the wire. Also, the inventors have found ~`~
. ~
that such conditions entail heavily agitated water levels within the suction boxes and that the sheet that is in the process of being created is thereby washed out by the wire water splashing on it from below, thereby impoverishing the content of fillers and fines. Viewed , . , ,:
overall, all of these phenomena lead to disturbances in ;i . . .. . .
the sheet formation and thus consistency reduction in the , . . - .: :. -paper web being created.
Moreover, the inventors have recognized that the ;
. ~ , ,~, ~ ., .
interior of the suction box bordering on the wire should ~ i always be full of water, so that the wire is always "under water. N Hence, the wire should remain wettedalways uniformly, notably across the web width. The invention can bé'used both with hybrid formers and so-called gap formers. As the case may be, it may be ~`i;
important for the suction boxes of the one wire to oppose ~ `
those of the other wire, and at that, in such a fashion ; . : :. :::: , ,.,: ., that they overlap at least partly. It may be favorable ,,'""~
,. ~.~: :,; ,.~ . :~.. ~..
: -:.. ~ ::.,.
::
, .
i:,2'~ t~ ' 7, 8~ 43 -4- `
for the suction boxes on the one and on the other side of the dewatering section to be identical in shape.
The invention allows employment both with horizontal and vertical dewatering sections, but also with a dewatering section tilted relative to the horizontal.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained more fully with the aid of the drawing, which in detail illustrates the following:
Fig. 1 shows schematically, viewed in side elevation, a twin-wire former with two wires 1, 2, each ~ ~
forming a wire loop. Fig. 2 shows the suction box in i ~;
greater detail.
Fig. 3 and 4 are vertical sections through the dewatering section of essentially horizontal arrangement, formed of the two wires 1 and 2. ~ -Figs. 5 and 6 show the invention being applied in a i ; ~, twin-wire former with an essentially vertical dewatering -~ -section . , D~TAI~ED ~ESCRI~ION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, and in particular Fig. l,ithe lower of the two wires, namely wire 1, loops ~`;;
among others around a wire table 3 with a curved working surface, thereafter around a suction box 4 with a ;~ `
plurality of dewatering slats 5, and lastly a suction ~ ;
separator 6. The top wire 2 loops around a suction box 14 with dewatering slats 15 contained in it. Guide 2~i43 :
.. : . .
rollers are coordinated with both wire loops, which guide rollers are not material to the present invention. The dewatering slats 5 contained within the suction box 4 are forced elastically on the wire 1, whereas the dewatering slats 15 of the suction box 14 of wire 2 are mounted -~
rigidly. The slats 5 and slats 15 are staggered~
As shown in Fig. 2, suction box 14 i8 subdivided in ~-~
,. ,:: : .
two suction boxes 14.1, 14.2 by a partition 14.3. Also -~
visible are suction sockets 14.4 and 14.5. ~ ;
., .. :. ~ . .~, Fig. 3 is a vertical section in the direction of - ~
: . ,:.~,: :.
travel of the paper web, while Fig. 4 is a vertical ; ~;
section perpendicular to the direction of travel of the paper web. Visible again are the two suction boxes 4, 14, as previously shown in Fig. 1, and the dewatering ~ ;
slats 5, or 15. The lower suction box 4 is connected to a stand pipe 4.1 which presently communicates with the -interior of the suction box. The stand pipe 4.1 has a suction hookup 4.2. Employing a vacuum, a wire water `
level 4.3 is established in the stand pipe 4.1 which ranges distinctly above the wire 1. The two wires 1 : ~,: ~, .- .,., ;. ;, and 2 envelope in sandwich fashion the paper web 7 that is being created'. ' ' ~ -` ;
,:~
Suction box 14 also has a vacuum socket, 14.2. The `
wire water level 14.3 of suction box 14, of course, also ranges above the wire 2, which follows automatically when : . ....
using suction boxes in a twin-wire. It is essential, . . . , . . . . .., .:
:-: - . ,., ,, .. : .,;
.. ~ .. ",, ,. ,-, .. .: ,:,: ~.,.: ~:
:. ::-.";' ..:
2 1 ~ 3 -6- ' however, that the two suction boxes 4 and 5 are opposed, as can be seen from Figs. 3 and 4.
In Figs. 5 and 6, the invention is being applied in '`~' a twin-wire former with an essentially vertical dewatering section. Visible again are the two wires 1, 2, each forming an endless wire loop. Contained within the wire 1 is again a suction box 4 with dewatering slats 5 which can be forced elastically on the inside surface of wire 1. Contained within wire 2 is a '~
dewatering box 14 with dewatering slats 15 which are arranged in nonyielding fashion, and thus bear in a stationary manner on the inside surface of wire 1. ~ -Both suction boxes feature suction sockets 4.4 "~`;' ''~'' and 14.4, along with stand pipes 8 and 18. The stand pipes have respective suction sockets 8.1 and 18.1.
During operation, the vacuum on the suction sockets 8.1 '~
and 18.1 i9 80 dimensioned that the level 8.2, or 18.2, ' in the respective stand pipe ranges distinctly above the ' '~
upper edge of the rolevant suction box, so that the two ' '''~';
wires 1, 2 are always "under water."
As an alternative to the embodiment relative to Fig. 5,"the twol'dewatering boxes 4, 14 may be fashioned with their appertaining dewatering slats 5, or 15, according to Fig. 6.
Coordinated with the twin-wire former, of course, `~
i9 a headbox, of which in Fig. 1 and 5 only the sluice 10 i8 illustrated. The twin-wire formers are followed by . ``; s ' h ' ~'F
81~
the usual units, generally a press section, which is not shown. .~' ~ -,'..'"
,: ~: . . ,., ~;~:
:
;., :,., :
Dieter Egelhof Volker Schmidt-Rohr `' "' "i`'`": "' TWIN-WIRE FORMER FOR A PAPER MACHINE
BACKGROUND OF THE INVENTION - -The invention concerns a twin-wire former for a paper machine. Regarding the prior art, reference is made to the following documents: ;- s (1) DE-PS 68 28 94 (2) WO 91/01408 i~; -(3) US 5,045,153 (4) DE-PS 20 23 521 The invention described in the U.S. Patent 5,045,153 includes slats arranged in both wire loops. The slats ~ ;;, ;
within one wire loop are arranged so as to oppose the slats within the other wire loop. The slat~ of the one -~
and also the other group may be contained within suction ;
. , -boxes, since these apply a vacuum on the entire area of the slats in order to thereby enhance the dewatering.
The suction boxQs feature appropriate suction hookups acros~ which a vacuum is applied in order to remove the ~-,,~ . , ::
water from the boxes. In this removal of wire water, or filtrat-, the suction boxes are not, or only partly, ;~
filled with water.
Paper manufacturers deslre to produce a paper which ` ~
is homogeneous in any respect. It should feature a `~`
, ,, ,. : . ':: . ;:; ;
uniform profile both across the web width, as regards its ~;;
::: ": "
thickness, and also its composition of material. It shouId also have consistent properties in the machine ;~;
'~li8~43 ~ ~
r~ ~
-2- ~ ~;
direction. For that purpose, great efforts are undertaken to provide, especially in the area of sheet formation, i-e-, on the twin-wire former, all of the prereguisites for a good paper web quality in the above sense. Nonetheless, this has not yet been mastered completely.
Thus, the problem underlying the present invention i8 to provide a twin-wire former that meets the prerequisites for a paper web which is consistent in any respect. - -SUMMARY OF THE INVENTION
This problem is solved by the combination of the features of the present invention. The present invention comprises, in one form thereof, a twin-wire former for a paper machine having a first and a second wire, each ~ ;
forming a wire loop, and with a plurality of dewatering slats within the two wire loops. The slats of the first wire bear on the inside surface of the first wire (first -~
slats), and the slats of the second wire bear on the inside surface of the second wire (second slats). The slats are arranged in groups within suction boxes, each suctionibox being connectable to a vacuum.' The sucti!on boxes of the two wires are opposed, overlapping at least partly. Each suction box can be connected--indirectly or directly--to a vacuum, the vacuum being adjustable to the effect that the wire is always wetted by the wire water wlthin the respective suction box. -'','`'~'''`'~
'~ "' '.': ' .~
::~, :.. :.
:.: ...: :.;, . ;..:
21~ gl~3 ,~ ,.
.... .
-3- ~ ~
The inventors have recognized that the i afor~mentioned dewatering boxes during the operation of -the paper machine are not, or not completely, filled with wire water. The wire water level within ths suction box can fluctuate quite considerably during operation. There may be phases in which the level is nearly at the bottom of the box, and there may be such in which it more or less touches the wire. Also, the inventors have found ~`~
. ~
that such conditions entail heavily agitated water levels within the suction boxes and that the sheet that is in the process of being created is thereby washed out by the wire water splashing on it from below, thereby impoverishing the content of fillers and fines. Viewed , . , ,:
overall, all of these phenomena lead to disturbances in ;i . . .. . .
the sheet formation and thus consistency reduction in the , . . - .: :. -paper web being created.
Moreover, the inventors have recognized that the ;
. ~ , ,~, ~ ., .
interior of the suction box bordering on the wire should ~ i always be full of water, so that the wire is always "under water. N Hence, the wire should remain wettedalways uniformly, notably across the web width. The invention can bé'used both with hybrid formers and so-called gap formers. As the case may be, it may be ~`i;
important for the suction boxes of the one wire to oppose ~ `
those of the other wire, and at that, in such a fashion ; . : :. :::: , ,.,: ., that they overlap at least partly. It may be favorable ,,'""~
,. ~.~: :,; ,.~ . :~.. ~..
: -:.. ~ ::.,.
::
, .
i:,2'~ t~ ' 7, 8~ 43 -4- `
for the suction boxes on the one and on the other side of the dewatering section to be identical in shape.
The invention allows employment both with horizontal and vertical dewatering sections, but also with a dewatering section tilted relative to the horizontal.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained more fully with the aid of the drawing, which in detail illustrates the following:
Fig. 1 shows schematically, viewed in side elevation, a twin-wire former with two wires 1, 2, each ~ ~
forming a wire loop. Fig. 2 shows the suction box in i ~;
greater detail.
Fig. 3 and 4 are vertical sections through the dewatering section of essentially horizontal arrangement, formed of the two wires 1 and 2. ~ -Figs. 5 and 6 show the invention being applied in a i ; ~, twin-wire former with an essentially vertical dewatering -~ -section . , D~TAI~ED ~ESCRI~ION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, and in particular Fig. l,ithe lower of the two wires, namely wire 1, loops ~`;;
among others around a wire table 3 with a curved working surface, thereafter around a suction box 4 with a ;~ `
plurality of dewatering slats 5, and lastly a suction ~ ;
separator 6. The top wire 2 loops around a suction box 14 with dewatering slats 15 contained in it. Guide 2~i43 :
.. : . .
rollers are coordinated with both wire loops, which guide rollers are not material to the present invention. The dewatering slats 5 contained within the suction box 4 are forced elastically on the wire 1, whereas the dewatering slats 15 of the suction box 14 of wire 2 are mounted -~
rigidly. The slats 5 and slats 15 are staggered~
As shown in Fig. 2, suction box 14 i8 subdivided in ~-~
,. ,:: : .
two suction boxes 14.1, 14.2 by a partition 14.3. Also -~
visible are suction sockets 14.4 and 14.5. ~ ;
., .. :. ~ . .~, Fig. 3 is a vertical section in the direction of - ~
: . ,:.~,: :.
travel of the paper web, while Fig. 4 is a vertical ; ~;
section perpendicular to the direction of travel of the paper web. Visible again are the two suction boxes 4, 14, as previously shown in Fig. 1, and the dewatering ~ ;
slats 5, or 15. The lower suction box 4 is connected to a stand pipe 4.1 which presently communicates with the -interior of the suction box. The stand pipe 4.1 has a suction hookup 4.2. Employing a vacuum, a wire water `
level 4.3 is established in the stand pipe 4.1 which ranges distinctly above the wire 1. The two wires 1 : ~,: ~, .- .,., ;. ;, and 2 envelope in sandwich fashion the paper web 7 that is being created'. ' ' ~ -` ;
,:~
Suction box 14 also has a vacuum socket, 14.2. The `
wire water level 14.3 of suction box 14, of course, also ranges above the wire 2, which follows automatically when : . ....
using suction boxes in a twin-wire. It is essential, . . . , . . . . .., .:
:-: - . ,., ,, .. : .,;
.. ~ .. ",, ,. ,-, .. .: ,:,: ~.,.: ~:
:. ::-.";' ..:
2 1 ~ 3 -6- ' however, that the two suction boxes 4 and 5 are opposed, as can be seen from Figs. 3 and 4.
In Figs. 5 and 6, the invention is being applied in '`~' a twin-wire former with an essentially vertical dewatering section. Visible again are the two wires 1, 2, each forming an endless wire loop. Contained within the wire 1 is again a suction box 4 with dewatering slats 5 which can be forced elastically on the inside surface of wire 1. Contained within wire 2 is a '~
dewatering box 14 with dewatering slats 15 which are arranged in nonyielding fashion, and thus bear in a stationary manner on the inside surface of wire 1. ~ -Both suction boxes feature suction sockets 4.4 "~`;' ''~'' and 14.4, along with stand pipes 8 and 18. The stand pipes have respective suction sockets 8.1 and 18.1.
During operation, the vacuum on the suction sockets 8.1 '~
and 18.1 i9 80 dimensioned that the level 8.2, or 18.2, ' in the respective stand pipe ranges distinctly above the ' '~
upper edge of the rolevant suction box, so that the two ' '''~';
wires 1, 2 are always "under water."
As an alternative to the embodiment relative to Fig. 5,"the twol'dewatering boxes 4, 14 may be fashioned with their appertaining dewatering slats 5, or 15, according to Fig. 6.
Coordinated with the twin-wire former, of course, `~
i9 a headbox, of which in Fig. 1 and 5 only the sluice 10 i8 illustrated. The twin-wire formers are followed by . ``; s ' h ' ~'F
81~
the usual units, generally a press section, which is not shown. .~' ~ -,'..'"
,: ~: . . ,., ~;~:
:
;., :,., :
Claims (6)
1. A twin-wire former for a paper machine, comprising:
a first wire forming a first wire loop;
a second wire forming a second wire loop;
a first suction box situated within the first wire loop, said first suction box having wire water therein, and being operably connected to a first vacuum source;
a second suction box situated within the second wire loop, said second suction box having wire water therein, and being operably connected to a second vacuum source;
a plurality of first dewatering slats situated within the first wire loop, said first dewatering slats being arranged in groups within the first suction box, and bearing on the inside surface of the first wire;
a plurality of second dewatering slats situated within the second wire loop, said second dewatering slats being arranged in groups within the second suction box, and bearing on the inside surface of the second wire;
each suction box arranged to oppose the other suction box, such that the suction boxes at least partially overlap;
the first vacuum source including means for adjusting a vacuum created by said first vacuum source such that the wire is always wetted by the wire water within the first suction box; and the second vacuum source including means for adjusting a vacuum created by said second vacuum source such that the wire is always wetted by the wire water within the second suction box.
a first wire forming a first wire loop;
a second wire forming a second wire loop;
a first suction box situated within the first wire loop, said first suction box having wire water therein, and being operably connected to a first vacuum source;
a second suction box situated within the second wire loop, said second suction box having wire water therein, and being operably connected to a second vacuum source;
a plurality of first dewatering slats situated within the first wire loop, said first dewatering slats being arranged in groups within the first suction box, and bearing on the inside surface of the first wire;
a plurality of second dewatering slats situated within the second wire loop, said second dewatering slats being arranged in groups within the second suction box, and bearing on the inside surface of the second wire;
each suction box arranged to oppose the other suction box, such that the suction boxes at least partially overlap;
the first vacuum source including means for adjusting a vacuum created by said first vacuum source such that the wire is always wetted by the wire water within the first suction box; and the second vacuum source including means for adjusting a vacuum created by said second vacuum source such that the wire is always wetted by the wire water within the second suction box.
2. The twin-wire former of claim 1, wherein the first suction box is connected to a first stand pipe to which the vacuum can be applied, said vacuum being adjustable such that the level of the wire water in the first stand pipe ranges above the top edge of the first suction box; and wherein the second suction box is connected to a second stand pipe to which the vacuum can be applied, said vacuum being adjustable such that the level of the wire water in the second stand pipe ranges above the top edge of the second suction box.
3. The twin-wire former of claim 1, wherein the dewatering slats in the groups within the respective suction boxes extend in a horizontal direction.
4. The twin-wire former of claim 1, wherein the dewatering slats in the groups within the respective suction boxes extend in a vertical direction.
5. The twin-wire former of claim 1, wherein the dewatering slats in the groups within the respective suction boxes extend at an angle, inclined relative to the horizontal.
6. The twin-wire former of claim 1, wherein the first dewatering slats bear flexibly on the inside surface of the first wire, and the second dewatering slats bear in nonyielding fashion on the inside surface of the second wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934335304 DE4335304C2 (en) | 1993-10-16 | 1993-10-16 | Method for operating a twin wire former |
| DEP4335304.5 | 1993-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2118143A1 true CA2118143A1 (en) | 1995-04-17 |
Family
ID=6500304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2118143 Abandoned CA2118143A1 (en) | 1993-10-16 | 1994-10-14 | Twin-wire former for a paper machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0648892A1 (en) |
| JP (1) | JPH07150497A (en) |
| CA (1) | CA2118143A1 (en) |
| DE (1) | DE4335304C2 (en) |
| FI (1) | FI944840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7524401B2 (en) | 2003-12-22 | 2009-04-28 | Astenjohnson, Inc. | Hybrid type forming section for a paper making machine |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4335304C2 (en) * | 1993-10-16 | 1995-04-20 | Voith Gmbh J M | Method for operating a twin wire former |
| DE29619709U1 (en) * | 1996-11-13 | 1997-01-09 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Screen section of a paper machine |
| DE10009362A1 (en) * | 2000-02-29 | 2001-08-30 | Voith Paper Patent Gmbh | Double fourdrinier section for the wet paper/cardboard web follows a vertical path with weirs at the units to form the web and extract water to reduce the washing out of fine matter and filling materials |
| SE526787C2 (en) * | 2003-10-21 | 2005-11-01 | Metso Paper Karlstad Ab | Support for use in e.g. press for dewatering fiber web manufactured in paper manufacturing machine, is movable towards counter-pressure surface, is elastically deformable, and has contact surface adaptable to counter-pressure surface |
| US8801902B1 (en) * | 2013-09-18 | 2014-08-12 | Usg Interiors, Llc | Water reduction by modulating vacuum |
| CN110396850B (en) * | 2019-07-10 | 2020-09-11 | 湖北金庄科技再生资源有限公司 | Paper sheet dehydration forming device for wire part of paper machine and method for dehydrating paper sheet |
| CN212247653U (en) * | 2020-04-10 | 2020-12-29 | 维美德技术有限公司 | Suction box of fiber web machine and fiber web machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE682894C (en) * | 1937-12-14 | 1939-10-26 | August Schneider | Device for separating and removing air or. Gas-liquid mixtures from vacuum drainage devices |
| IT1201808B (en) * | 1986-09-05 | 1989-02-02 | Awe Anti Wear Eng Srl | PASTE DEHYDRATION PROCESS FOR PAPER AND CONTEMPORARY FORMATION OF THE SHEET IN A DOUBLE CANVAS SYSTEM AND PLANT ADOPTING SUCH PROCEDURE |
| ATE130891T1 (en) * | 1989-07-24 | 1995-12-15 | Peter A Rodriguez | METHOD FOR FORMING AND RELEASING WATER FROM A BELT ON A FOURDRINIER MACHINE. |
| JPH04505190A (en) * | 1989-11-03 | 1992-09-10 | ロドリゲス，ピーター エー． | Method and apparatus for recovering pulp solids from white water |
| DE4005420C2 (en) * | 1990-02-21 | 1995-06-08 | Voith Gmbh J M | Twin wire former |
| DE4037017C2 (en) * | 1990-11-20 | 1994-12-08 | Escher Wyss Gmbh | Wet part of a twin wire paper machine |
| DE4208681A1 (en) * | 1992-03-18 | 1993-09-23 | Escher Wyss Gmbh | Double four drinker paper-making press section - has forming roller for lower four drinker at entry with water extn. unit and further forming roller at upper four drinker |
| DE4335304C2 (en) * | 1993-10-16 | 1995-04-20 | Voith Gmbh J M | Method for operating a twin wire former |
-
1993
- 1993-10-16 DE DE19934335304 patent/DE4335304C2/en not_active Expired - Fee Related
-
1994
- 1994-09-17 EP EP94114686A patent/EP0648892A1/en not_active Withdrawn
- 1994-10-14 FI FI944840A patent/FI944840A/en unknown
- 1994-10-14 CA CA 2118143 patent/CA2118143A1/en not_active Abandoned
- 1994-10-17 JP JP25093794A patent/JPH07150497A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7524401B2 (en) | 2003-12-22 | 2009-04-28 | Astenjohnson, Inc. | Hybrid type forming section for a paper making machine |
Also Published As
| Publication number | Publication date |
|---|---|
| FI944840A (en) | 1995-04-17 |
| EP0648892A1 (en) | 1995-04-19 |
| DE4335304A1 (en) | 1994-03-03 |
| JPH07150497A (en) | 1995-06-13 |
| DE4335304C2 (en) | 1995-04-20 |
| FI944840A0 (en) | 1994-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2053239C (en) | Twin-wire former | |
| US2893486A (en) | Fourdrinier paper making machine | |
| CA1176888A (en) | Twin-wire forming section of a paper machine | |
| CA1299904C (en) | Hydrid former for a paper machine | |
| US4532008A (en) | Horizontal twin wire machine | |
| EP0520970B1 (en) | Twin-wire former in a paper machine | |
| CA2118143A1 (en) | Twin-wire former for a paper machine | |
| FI83977C (en) | Gap formers in paper machine | |
| AU633107B2 (en) | Pressure control forming section | |
| US4414061A (en) | Twin wire paper forming apparatus | |
| US5552021A (en) | Method, device and arrangement for regulating the control of a transverse profile of a paper web in a paper machine | |
| CA2050844A1 (en) | Twin-wire web former in a paper machine | |
| US4565603A (en) | Method and device for reducing disturbances during paper web formation | |
| CA2040999A1 (en) | Vertical former | |
| CA2123821C (en) | Web former in a paper machine | |
| CA2123820A1 (en) | Gap former in a paper machine | |
| CA1079558A (en) | Papermaking machine | |
| CA1233055A (en) | Process and equipment for water discharge from fiber pulp | |
| US5573643A (en) | Twin wire web former in a paper machine | |
| US3578556A (en) | Vertical paper machine wherein stock impinges wires below the breast rolls | |
| US7300553B2 (en) | Arrangement for a wire section of a paper or board machine | |
| FI80740C (en) | Device for forming a paper web | |
| CA2057932C (en) | Continuous controlled drainage | |
| GB1055749A (en) | Improvements in or relating to paper-making machines | |
| CA1057546A (en) | Twin wire paper forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19971014 |