EP0251778A1 - Method and apparatus for removing water from a fibrous web in a papermachine - Google Patents
Method and apparatus for removing water from a fibrous web in a papermachine Download PDFInfo
- Publication number
- EP0251778A1 EP0251778A1 EP87305818A EP87305818A EP0251778A1 EP 0251778 A1 EP0251778 A1 EP 0251778A1 EP 87305818 A EP87305818 A EP 87305818A EP 87305818 A EP87305818 A EP 87305818A EP 0251778 A1 EP0251778 A1 EP 0251778A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- dewatering
- cover
- dewatering unit
- units
- 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.)
- Granted
Links
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
-
- 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
Definitions
- the present invention relates to a method and apparatus applicable to paper machines for removing water from a fibrous web.
- the method employs a so-called twin wire former (two endless, opposed mesh belts) where drainage is effected both upwards and downwards.
- the method involves production of flows in the fibrous web, said flows being longitudinal with respect to the web and bringing the fibers into a turbulent state in the surface of the web. Said flows are caused by arranging the foils of the dewatering units to be adjustable in the direction of the web and by disposing them at least partly opposite to one another on different sides of the web.
- DE patent 3138133 discloses different alternatives of arranging drainage at a twin wire former.
- the only features common to the vari ations are that, in the dewatering zone, the web is wavy and the dewatering elements disposed both above and below the web are positioned alternately. Furthermore, it has to be noted that in said device disclosed in the patent, pressure on the web is effected by tension of wires.
- This arrangement has the advantage of effecting pulses and heavy turbulence in the surface layer of the web, which prevents flocculation on the surface of the web, thus improving the web quality.
- the dewatering units being adjustable with respect to each other in the direction of movement of the web ensure that in each case of web formation, it is possible to optimize the intensity of turbulence in the web surface, thus obtaining the best possible surface quality.
- the web is primarily pressed by adjusting the height of the lower dewatering unit, whereby the stresses on wires diminish when compared with for example the above-mentioned DE patent publication.
- the method according to the present invention is characterized in that the position of the cover of one dewatering unit is adjusted relative to the the cover of the other dewatering unit, thereby affecting both the intensity of the turbulence generated in the web surface and the distribution of the components of said turbulence, said components moving in different directions.
- the apparatus according to the present invention is characterized in that web forming is effected in a twin wire former, said former having two dewatering units, the covers of which units or a side portion thereof comprise rows of pressure elements, which elements at least partly match or are at least partially aligned on opposite sides of the web.
- the method and apparatus of the present invention are primarily intended to be applied to a fourdrinier machine 1 as shown in Fig. 1.
- the wet end of the fourdrinier machine 1 comprises in its simplest form a headbox 2 and a fourdrinier wire section 3, said fourdrine:r wire section comprising wire 4, breast roll 5, other rolls 6 and dewatering elements 7.
- the rear or downstream end of the fourdrinier wire section 3, i.e. a so-called web forming section 8, comprises an on-top unit 9 above the web and a dewatering unit 30 below the fourdrinier or the bottom or lower wire 4.
- the on-top unit 9 includes, for example, a dewatering unit 30 and rolls 11, 12, 13 and 14, all of which, except for roll 13, are adjustable either vertically or, by means of a turning arm, in a swinging manner.
- the upper dewatering unit 20 mainly comprises three chambers 21, 22 and 23, which have a side part or cover 25 composed of rows of constricting or pressure elements 24, said cover being common to all of said chambers.
- the height of the slice opening of the first chamber 21 is adjustable. Water drained straight through top run of wire 10 without the help of dewatering elements above the wire is led to said chamber 21. All chambers of the dewatering unit 20 function as suction boxes the suction capacity of which is adjustable.
- the dewatering unit 20 itself is adjustable both vertically and in the longitudinal angle with respect to the machine.
- the lower dewatering unit 30 comprises two covers 34 and 35 formed by pressure elements 32 and 33, said elements being united by a joint 31.
- the covers 34 and 35 are supported by beams 36 which are transverse in view of the machine direction through pressure-medium filled hose-like elements 37 so as to enable the longitudinal adjustment of the angular position of the covers 34 and 35 with respect to the machine.
- the pressure caused by the covers 34 and 35 on the bottom wire 4 can be changed.
- the adjustability is ensured by the fact that the pressure adjustment of each hose-like pressure element 37 is independent of the other elements 37.
- the covers 34 and 35 are supported by an element 38 adjustable longitudinally relative to the machine, said support element being attached to the machine frame at one end and to the cover 34 at its other end. Any other elements relating to the longitudinal adjustment are unnecessary because hose-like pressure elements 37 provide a sufficient adjusting allowance. If required, distances between various tables can be adjusted.
- FIG. 3 illustrates a twin wire former where the shape and opposed location of consecutively arranged constricting or pressure dewatering elements 24 and 33 of the upper and lower dewatering units 20 and 30 match.
- Fig. 4 illustrates a possible arrangement as shown in Fig. 4 in which the pressure elements 24 and 33 only partly match i.e. they are partly out of vertical alignment.
- Fig. 4 illustrates a twin wire former where the shape and opposed location of consecutively arranged constricting or pressure dewatering elements 24 and 33 of the upper and lower dewatering units 20 and 30 match.
- the pressure elements 24 and 33 only partly match i.e. they are partly out of vertical alignment.
- a corresponding result is also achieved if the distance between the covers 34 and 35 does not correspond to that between the dewatering elements 24 of the dewatering unit 20 above the web or to a multiple of said distance, in which case at least one of the covers 34 or 35 is disposed in accordance with Fig. 4.
- Removal of water from a fibrous web in accordance with the invention is effected as shown in Fig. 5.
- the pressure of the lower dewatering unit on the web through pressure elements 33 makes the wires 4 and 10 swell a little outwards from the web in between the pressure elements 33 and 24.
- the pressure compresses the web between the opposite elements 24 and 33 so as to make water flow in the machine direction so that first, when entering the range of the rows, it flows opposite to the moving direction of the web whereas on the other edge of the rows it flows at an accelerated speed in the moving direction of the web.
Landscapes
- Paper (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Artificial Filaments (AREA)
- Stringed Musical Instruments (AREA)
- Seasonings (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
Description
- The present invention relates to a method and apparatus applicable to paper machines for removing water from a fibrous web. The method employs a so-called twin wire former (two endless, opposed mesh belts) where drainage is effected both upwards and downwards. The method involves production of flows in the fibrous web, said flows being longitudinal with respect to the web and bringing the fibers into a turbulent state in the surface of the web. Said flows are caused by arranging the foils of the dewatering units to be adjustable in the direction of the web and by disposing them at least partly opposite to one another on different sides of the web.
- In a known twin wire apparatus such as that disclosed in US patent 3994774, water removal from the web is effected by dewatering elements positioned alternately with respect to one another. In realization of one embodiment disclosed in said patent publication, conventional foils are used below the web with said foils being spaced relatively far apart from one another and characteristically removing water downwardly. Above the web and inside the other wire loop, there is another dewatering unit, the single dewatering elements of which are disposed between the foils of the lower dewatering unit. The upper dewatering unit is so disposed that, during operation, its single elements press the web together with the foils in slightly wavy manner. After the foils, water is separated from the web through the top wire by, pressure and centrifugal force and this water wi11 be removed from the top wire by means of a leading surface of said upper dewatering unit and led to a discharge pipe.
- Another prior art patent publication is DE patent 3138133 which discloses different alternatives of arranging drainage at a twin wire former. The only features common to the vari ations are that, in the dewatering zone, the web is wavy and the dewatering elements disposed both above and below the web are positioned alternately. Furthermore, it has to be noted that in said device disclosed in the patent, pressure on the web is effected by tension of wires.
- In spite of the fact that the draining capacity of such dewatering zone is relatively good, it also has some disadvantages. At each stage of drainage, water has free access straight upwards or downwards through the wire. Consequently, the fibers of the web tend to turn in the direction of the flow, which results in deterioration of the paper quality. On the other hand, filler loss is also bigger due to said fillers being discharged straight through the wire.
- To eliminate the disadvantages described above, a new type of former has been developed wherein the dewatering elements on different sides of the web are adjustable with respect to each other in the direction of movement of the web and rows of pressure elements of the opposite dewatering units at least partly match. The latter characteristic ensures that the direction of water flow in the web surface is not solely perpendicular to the level of the web but is also in conformity with the direction of movement of the web or opposite to it.
- This arrangement has the advantage of effecting pulses and heavy turbulence in the surface layer of the web, which prevents flocculation on the surface of the web, thus improving the web quality. The dewatering units being adjustable with respect to each other in the direction of movement of the web ensure that in each case of web formation, it is possible to optimize the intensity of turbulence in the web surface, thus obtaining the best possible surface quality.
- According to our invention, the web is primarily pressed by adjusting the height of the lower dewatering unit, whereby the stresses on wires diminish when compared with for example the above-mentioned DE patent publication.
- The method according to the present invention is characterized in that the position of the cover of one dewatering unit is adjusted relative to the the cover of the other dewatering unit, thereby affecting both the intensity of the turbulence generated in the web surface and the distribution of the components of said turbulence, said components moving in different directions.
- The apparatus according to the present invention is characterized in that web forming is effected in a twin wire former, said former having two dewatering units, the covers of which units or a side portion thereof comprise rows of pressure elements, which elements at least partly match or are at least partially aligned on opposite sides of the web.
- The invention will be described further, by way of example, with reference to the accompanying drawings, in which
- Fig. 1 is an overall schematic elevation of the wet end of a paper machine to which the present invention is applied;
- Fig. 2 is a fragmentary, detailed schematic elevational view of one embodiment of the apparatus according to the present invention;
- Figs. 3 and 4 are schematic illustrations on enlarged scale of the disposition of the dewatering elements with respect to each other in different embodiments;
- Fig. 5 is a schematic illustration of the operating principle of the method according to the present invention; and
- Fig. 6 is a fragmentary enlarged end elevation of the wire support means.
- The method and apparatus of the present invention are primarily intended to be applied to a fourdrinier machine 1 as shown in Fig. 1. The wet end of the fourdrinier machine 1 comprises in its simplest form a
headbox 2 and afourdrinier wire section 3, said fourdrine:r wiresection comprising wire 4,breast roll 5,other rolls 6 anddewatering elements 7. The rear or downstream end of thefourdrinier wire section 3, i.e. a so-calledweb forming section 8, comprises an on-top unit 9 above the web and adewatering unit 30 below the fourdrinier or the bottom orlower wire 4. - In accordance with Fig. 2, the on-
top unit 9 includes, for example, adewatering unit 30 androlls roll 13, are adjustable either vertically or, by means of a turning arm, in a swinging manner. Theupper dewatering unit 20 mainly comprises threechambers cover 25 composed of rows of constricting orpressure elements 24, said cover being common to all of said chambers. The height of the slice opening of thefirst chamber 21 is adjustable. Water drained straight through top run ofwire 10 without the help of dewatering elements above the wire is led to saidchamber 21. All chambers of the dewateringunit 20 function as suction boxes the suction capacity of which is adjustable. Furthermore, thedewatering unit 20 itself is adjustable both vertically and in the longitudinal angle with respect to the machine. - In the embodiment shown in Fig. 2, the
lower dewatering unit 30 comprises twocovers pressure elements joint 31. Thecovers beams 36 which are transverse in view of the machine direction through pressure-medium filled hose-like elements 37 so as to enable the longitudinal adjustment of the angular position of thecovers covers bottom wire 4 can be changed. The adjustability is ensured by the fact that the pressure adjustment of each hose-like pressure element 37 is independent of theother elements 37. Furthermore, to improve the adjustability of thedewatering unit 30, thecovers element 38 adjustable longitudinally relative to the machine, said support element being attached to the machine frame at one end and to thecover 34 at its other end. Any other elements relating to the longitudinal adjustment are unnecessary because hose-like pressure elements 37 provide a sufficient adjusting allowance. If required, distances between various tables can be adjusted. - A structure characteristic of a preferred embodiment of the invention is shown in Fig. 3, which illustrates a twin wire former where the shape and opposed location of consecutively arranged constricting or
pressure dewatering elements lower dewatering units cover 34, we come to a possible arrangement as shown in Fig. 4 in which thepressure elements covers dewatering elements 24 of thedewatering unit 20 above the web or to a multiple of said distance, in which case at least one of thecovers - Removal of water from a fibrous web in accordance with the invention is effected as shown in Fig. 5. The pressure of the lower dewatering unit on the web through
pressure elements 33 makes thewires pressure elements opposite elements pressure elements pressure elements - The preferred embodiment as described above is not intended to limit the invention of what is presented in the accompanying claims. It is therefore possible, whilst the adjustment in the direction of the web is effected by means of a pressure-medium filled
cylinder 38 in Fig. 2, that the adjustment is performed, for example, by an adjusting screw or equivalent mechanical device. Likewise, although Fig. 2 illustrates a two-part cover of the dewatering unit below the web, it is possible that there are several covers. The most substantial feature in the covers is that the pressure elements are secured to the covers and that the covers are substantially plane-like.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87305818T ATE63145T1 (en) | 1986-07-02 | 1987-07-01 | METHOD AND DEVICE FOR DEWATERING A FIBER WEB IN A PAPER MACHINE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI862808 | 1986-07-02 | ||
FI862808A FI862808A (en) | 1986-07-02 | 1986-07-02 | FOERFARANDE OCH ANORDNING FOER AVVATTNING AV EN FIBERBANA. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0251778A1 true EP0251778A1 (en) | 1988-01-07 |
EP0251778B1 EP0251778B1 (en) | 1991-05-02 |
Family
ID=8522867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87305818A Expired - Lifetime EP0251778B1 (en) | 1986-07-02 | 1987-07-01 | Method and apparatus for removing water from a fibrous web in a papermachine |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0251778B1 (en) |
JP (1) | JPH01118690A (en) |
KR (1) | KR900002102B1 (en) |
AT (1) | ATE63145T1 (en) |
BR (1) | BR8703365A (en) |
DE (1) | DE3769710D1 (en) |
ES (1) | ES2022356B3 (en) |
FI (1) | FI862808A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3815316A1 (en) * | 1988-05-05 | 1989-11-16 | Escher Wyss Gmbh | Device for dewatering on a twin-wire former |
WO1990005210A1 (en) * | 1988-10-31 | 1990-05-17 | Beloit Corporation | Forming apparatus |
EP0397430A1 (en) * | 1989-05-08 | 1990-11-14 | Valmet Paper Machinery Inc. | Web forming method and apparatus |
EP0438681A1 (en) * | 1990-01-26 | 1991-07-31 | Voith Sulzer Papiermaschinen GmbH | De-watering apparatus for a twin-wire former |
DE4002304A1 (en) * | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Paper forming stretch |
EP0520970A1 (en) * | 1991-06-26 | 1992-12-30 | Valmet Paper Machinery Inc. | Twin-wire former in a paper machine |
WO1993012292A1 (en) * | 1991-12-17 | 1993-06-24 | J.M. Voith Gmbh | Twin-wire former |
US5282933A (en) * | 1990-11-20 | 1994-02-01 | Sulzer Escher Wyss Gmbh | Wet section for a twin wire papermaking machine |
EP0393656B1 (en) * | 1989-04-19 | 1994-02-16 | Valmet-Tampella Inc. | Assembly in a paper machine for effecting upward dewatering |
EP1489226A2 (en) * | 2003-06-18 | 2004-12-22 | Voith Paper Patent GmbH | Device for improving the properties of a fibrous web manufactured in a web former |
EP1806453A1 (en) * | 2006-01-05 | 2007-07-11 | Andritz AG | Method and device for dewatering a sheet of fibrous material |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215594A (en) * | 1962-10-08 | 1965-11-02 | Black Clawson Co | Paper forming apparatus |
US4425188A (en) * | 1981-03-28 | 1984-01-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Forming shoes for the twin-wire former of a paper making machine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5122521A (en) * | 1974-08-15 | 1976-02-23 | Kubota Ltd | SEHISOCHITSUKITAUEKI |
JPS6170091A (en) * | 1984-09-12 | 1986-04-10 | 三菱重工業株式会社 | Apparatus for uniformly dispersing paper stock |
JPS6175898A (en) * | 1984-09-19 | 1986-04-18 | 三菱重工業株式会社 | Paper layer forming apparatus |
JPS6189398A (en) * | 1984-10-03 | 1986-05-07 | 三菱重工業株式会社 | Paper layer forming apparatus |
JPS61119796A (en) * | 1984-11-16 | 1986-06-06 | 三菱重工業株式会社 | Paper layer forming apparatus |
-
1986
- 1986-07-02 FI FI862808A patent/FI862808A/en not_active IP Right Cessation
-
1987
- 1987-07-01 AT AT87305818T patent/ATE63145T1/en not_active IP Right Cessation
- 1987-07-01 ES ES87305818T patent/ES2022356B3/en not_active Expired - Lifetime
- 1987-07-01 EP EP87305818A patent/EP0251778B1/en not_active Expired - Lifetime
- 1987-07-01 DE DE8787305818T patent/DE3769710D1/en not_active Revoked
- 1987-07-02 JP JP62164110A patent/JPH01118690A/en active Granted
- 1987-07-02 BR BR8703365A patent/BR8703365A/en unknown
- 1987-07-02 KR KR1019870007039A patent/KR900002102B1/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215594A (en) * | 1962-10-08 | 1965-11-02 | Black Clawson Co | Paper forming apparatus |
US4425188A (en) * | 1981-03-28 | 1984-01-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Forming shoes for the twin-wire former of a paper making machine |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3815316A1 (en) * | 1988-05-05 | 1989-11-16 | Escher Wyss Gmbh | Device for dewatering on a twin-wire former |
US5116477A (en) * | 1988-05-05 | 1992-05-26 | Sulzer-Escher Wyss Gmbh | Drainage device in a double-sieve mold |
WO1990005210A1 (en) * | 1988-10-31 | 1990-05-17 | Beloit Corporation | Forming apparatus |
EP0393656B1 (en) * | 1989-04-19 | 1994-02-16 | Valmet-Tampella Inc. | Assembly in a paper machine for effecting upward dewatering |
EP0397430A1 (en) * | 1989-05-08 | 1990-11-14 | Valmet Paper Machinery Inc. | Web forming method and apparatus |
EP0438681A1 (en) * | 1990-01-26 | 1991-07-31 | Voith Sulzer Papiermaschinen GmbH | De-watering apparatus for a twin-wire former |
DE4002304A1 (en) * | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Paper forming stretch |
US5320713A (en) * | 1990-01-26 | 1994-06-14 | Sulzer Escher Wyss Gmbh | Method of using a forming section of a papermaking machine |
US5282933A (en) * | 1990-11-20 | 1994-02-01 | Sulzer Escher Wyss Gmbh | Wet section for a twin wire papermaking machine |
EP0520970A1 (en) * | 1991-06-26 | 1992-12-30 | Valmet Paper Machinery Inc. | Twin-wire former in a paper machine |
US5387320A (en) * | 1991-06-26 | 1995-02-07 | Valmet Paper Machinery, Inc. | Twin-wire web former in a paper machine |
WO1993012292A1 (en) * | 1991-12-17 | 1993-06-24 | J.M. Voith Gmbh | Twin-wire former |
US5507918A (en) * | 1991-12-17 | 1996-04-16 | J.M. Voith Gmbh | Twin-wire former |
EP1489226A2 (en) * | 2003-06-18 | 2004-12-22 | Voith Paper Patent GmbH | Device for improving the properties of a fibrous web manufactured in a web former |
EP1489226A3 (en) * | 2003-06-18 | 2005-08-17 | Voith Paper Patent GmbH | Device for improving the properties of a fibrous web manufactured in a web former |
EP1806453A1 (en) * | 2006-01-05 | 2007-07-11 | Andritz AG | Method and device for dewatering a sheet of fibrous material |
Also Published As
Publication number | Publication date |
---|---|
JPH0444038B2 (en) | 1992-07-20 |
JPH01118690A (en) | 1989-05-11 |
DE3769710D1 (en) | 1991-06-06 |
ATE63145T1 (en) | 1991-05-15 |
BR8703365A (en) | 1988-03-15 |
FI862808A0 (en) | 1986-07-02 |
KR900002102B1 (en) | 1990-04-02 |
ES2022356B3 (en) | 1991-12-01 |
FI862808A (en) | 1988-01-03 |
KR880001887A (en) | 1988-04-27 |
EP0251778B1 (en) | 1991-05-02 |
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