WO1992014880A1 - Top wire device - Google Patents
Top wire device Download PDFInfo
- Publication number
- WO1992014880A1 WO1992014880A1 PCT/SE1991/000146 SE9100146W WO9214880A1 WO 1992014880 A1 WO1992014880 A1 WO 1992014880A1 SE 9100146 W SE9100146 W SE 9100146W WO 9214880 A1 WO9214880 A1 WO 9214880A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire
- web
- rolls
- carrying
- loop
- Prior art date
Links
Classifications
-
- 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
- This invention relates to machines for forming and treating pulp or stock or the like materials, preferably paper and board pulp or stock in machines having a so called wire, an endless band of permeable felt wire, upon which the pulp or stock is deposited as a web and moved forwardly under de-watering caused by suction or vacuum boxes arranged below the path of the wire and acting on the web through the wire. During the passage the web is made even and smoothed out as well as de-watered.
- a dandy roll or a closed loop wire is arranged above the wire path (just mentioned) with vacuum box devices adjacent such dandy roll or wire loop. Said dandy roll or wire loop engaging the top side of the web deposited onto the endless wire band for making the surface of the web more even.
- the object of this invention is to devise a new top wire arrangement based on the existing ones but having a unique processing approach as a consequence of the equipment configuration and positioned component features, facilitating even distribution of the fibers of the web thus equilizing the thickness of the web of stock or pulp deposited on the wire thereby creating a higher quality end product having smooth faces on both sides and higher tearing strength.
- a further object with the invention's function is to increase machine capacity (wire).
- the arrangement allows for high de-watering in an upward direction supplementing existing devices and consequently results in an increased consistency of the web enabling an increase in machine speed of the order of 6%.
- Control resolution with the invention provides a means of controlling the weight in grams per square meter.
- the new arrangement is constructed so as to create as little damming up or blocking of the wet pulp or stock web as possible and consequently permit a smooth entry and travel of the web in below the upper wire loop. This is achieved by letting the loop pass between two rolls characterized by either 1 or 2 dandy rolls arranged in sequence. The latter adjacent the upper face of the forming wire and web carried thereon, and displacably or adjustably arranged so as to engage the upwardly facing side of the web with a predeter ⁇ mined pressure and by arranging below the web carrying wire at least two vacuum boxes remote from each other and adjacent the rolls and one vacuum box above the wire loop between the rolls and acting through the wire loop portion running above and engaging the pulp or stock web.
- the first loop wire carrying roll engaged has a perforated mantle giving little resistance to water pressed out of the web allowing the water to transfer into the interior of the roll thus facilitating a reduction of the height or thickness of the web of pulp on the forming wire.
- Figure 1 is a schematical side view of a device according to the invention partially in section
- Figure 2 is a broken out end view of the device of Fig. 1
- Figure 3 is a schematical side view illustrating the drive and control arrangement according to the invention.
- FIG. 1 indicates an endless permeable wire band suspended, driven and carried in a not shown, known manner.
- Fig. 2 is indicated a portion of a forming table framework 2 for the known arrangement for carrying and driving the said wire 1.
- a chassis 3 secured to adjoining portions of the framework in such a way that one side thereof may be loosened and moved away or lifted from the framework in order to allow mounting of an endless closed wire loop band 4 indicated by dash-dotted line around and over a number of rolls to be discussed below mounted on such chassis.
- Two pairs of arms 5 are pivot mounted at cross members 6 secured between uprights 7 of the chassis 3.
- the arms 5 have at their outer ends bearings 8 engaging shaft ends 9 of a first and a second roll 10 and 11 respectively.
- adjustable setting or controlling mechanisms 14 in preferred embodiment contituted by threaded screw means co-operating with a tooth arrangement in turn biassed by step-motion motors.
- 15 indicates sleeves protecting the setting means.
- a loop tension adjusting apparatus 16 including a free running roll 17 swingably carried by an arm arrangement 18 biassed by a pressure medium operated piston and cylinder device 19.
- a doctor knife 20 is attached thereto and adapted to remove any pulp residues brought by the loop 4 and deposited on the surface of the roll 17.
- a loop directing and alingning roll 21 Opposite the tension adjustment roll 17 is mounted a loop directing and alingning roll 21 having servo means 22 for changing the position of the roll relatively to adjoining rolls 17 and 10 in order to keep the wire loop within a correct track or path.
- the machine framework 2 Carried by the machine framework 2 are two vacuum boxes 23 and 24 engaging the downwardly facing side of the wire 1 and de-watering the, not shown, web of pulp thereon.
- the vacuum boxes 23 and 24 are mounted close to the rolls 10 and 11 for removing water seeping from the web adjacent the rolls 10 and 11.
- Said vacuum box device 25 facing the other way, i.e. downwardly and engaging - through the wire loop gauze - the top side of the web carried by the wire 1.
- Said vacuum box device includes a box like structure suspended by links 26 by the arms 5 each carrying a roll 10 or 11. Thereby the movements and positions of the box device 25 is closely connected to the movements and positions of the two rolls 10 and 11.
- the construction is so arranged that the tangential planes at the downwardly facing side of the two rolls 10 and 11 and the upwardly facing sides of the vacuum boxes 23 and 24 and the downwardly facing side of the vacuum box arrangement 25 will be essentially aligned to create little resistance to the passage of the wire and pulp yet effectively tension the upper and lower wires through between the two rolls.
- the vacuum box arrangement 25 includes three chambers 25a, 25b and 25c indicated by the presence of vacuum meters 27 and inspection plugs.
- the suction opening of the box 25a being the first to encounter the moving pulp or stock web on the wire 1 is rather short seen in the direction of movement and is intended to keep a water barrier stationary at the leading edge of the vacuum box device 25 intended to function as a liquid sealing preventing the sucking in of air into the box chambers thereby reducing the function of the vacuum chambers. It is essential to keep such a water barrier all the times during the operation of a wire machine.
- the closed felt wire loop 4 is of conventional type. Of the two rolls 10 and 11 - in the preferred embodiment - the first one is of lattice or perforated type having a mantle surface presenting a large number of openings or perforations allowing water which has passed through the wire loop to proceed inwardly without any obstructions. This feature is of importance for the smooth entering of the web of pulp into the confined space between the lower wire and the upper wire loop.
- the second roll 11 is the drive roll and is covered by a high friction surface material such as rubber or the like in order to without slip pull the wire loop around the other rolls.
- the wire loop arrangement is adaped to be separately driven and there exists no mechanical connection between the driving system of the lower wire and the upper wire loop respectively.
- a speed sensor or tachometer 28 is arranged to sense the speed of the wire 1 and send signals to a control central 29 in turn governing the drive motor 30 of the upper wire 4.
- References 31, 32, and 33 indicate connection to the mains, power control and rectifiers, which deliver power to tyristor devices 34 in turn controlled from the tachometer 28 and the control desk
- the vacuum boxes below the wire 1 are connected to the vacuum source of the basic wire apparatus as indicated by lines 36.
- the inverted vacuum box device 25 is connected to its own vacuum source 37, which preferably is of fan type.
Landscapes
- Paper (AREA)
Abstract
Top wire device intended to co-operate with a wire machine, including a movable wire intended to receive and forward a pulp or stock material web to be formed and de-watered during the passage of the wire and including de-watering means and a top wire forming device and arranged above the web carrying movable wire. The new invention is characterized by at least two rolls (10 and 11) carrying and guiding an endless permeable wire loop (4) one portion of which is arranged to be essentially parallel with the web carrying wire (1) and to engage the upwardly facing surface of such web for forming same, the roll (19) being the first to meet the moving web having a perforated like mantle or casing allowing water to escape therethrough, at least two vacuum boxes (23, 24) arranged below the web carrying wire (1) adjacent the two rolls (19, 11) and one vacuum device (25) arranged between said rolls above the said parallel portion to draw water away upwardly from the web (1).
Description
TOP WIRE DEVICE
This invention relates to machines for forming and treating pulp or stock or the like materials, preferably paper and board pulp or stock in machines having a so called wire, an endless band of permeable felt wire, upon which the pulp or stock is deposited as a web and moved forwardly under de-watering caused by suction or vacuum boxes arranged below the path of the wire and acting on the web through the wire. During the passage the web is made even and smoothed out as well as de-watered.
State of the art.
It is known, in order to achieve better de-watering and formation characteristic, a dandy roll or a closed loop wire is arranged above the wire path (just mentioned) with vacuum box devices adjacent such dandy roll or wire loop. Said dandy roll or wire loop engaging the top side of the web deposited onto the endless wire band for making the surface of the web more even.
Object of Invention.
The object of this invention is to devise a new top wire arrangement based on the existing ones but having a unique processing approach as a consequence of the equipment configuration and positioned component features, facilitating even distribution of the fibers of the web thus equilizing the thickness of the web of stock or pulp deposited on the wire thereby creating a higher quality end product having smooth faces on both sides and higher tearing strength.
A further object with the invention's function is to increase machine capacity (wire). The arrangement allows for high de-watering in an upward direction supplementing existing
devices and consequently results in an increased consistency of the web enabling an increase in machine speed of the order of 6%. Control resolution with the invention provides a means of controlling the weight in grams per square meter.
Brief description of the invention.
The new arrangement is constructed so as to create as little damming up or blocking of the wet pulp or stock web as possible and consequently permit a smooth entry and travel of the web in below the upper wire loop. This is achieved by letting the loop pass between two rolls characterized by either 1 or 2 dandy rolls arranged in sequence. The latter adjacent the upper face of the forming wire and web carried thereon, and displacably or adjustably arranged so as to engage the upwardly facing side of the web with a predeter¬ mined pressure and by arranging below the web carrying wire at least two vacuum boxes remote from each other and adjacent the rolls and one vacuum box above the wire loop between the rolls and acting through the wire loop portion running above and engaging the pulp or stock web.
In order to allow a smooth entry of the web into the narrow space below the closed wire loop and above the forming wire the first loop wire carrying roll engaged has a perforated mantle giving little resistance to water pressed out of the web allowing the water to transfer into the interior of the roll thus facilitating a reduction of the height or thickness of the web of pulp on the forming wire.
Detailed description of preferred embodiment.
A preferred embodiment of the device according to the invention will be described below with references to the accompanying drawings, in which
Figure 1 is a schematical side view of a device according to the invention partially in section ,
Figure 2 is a broken out end view of the device of Fig. 1, and
Figure 3 is a schematical side view illustrating the drive and control arrangement according to the invention.
On the drawing, 1 indicates an endless permeable wire band suspended, driven and carried in a not shown, known manner. In Fig. 2 is indicated a portion of a forming table framework 2 for the known arrangement for carrying and driving the said wire 1.
As the forming table, its framework and forming wire carrying roll arrangement are conventional they will not be further described.
Resting above the forming wire and table framework 2, is arranged a chassis 3 secured to adjoining portions of the framework in such a way that one side thereof may be loosened and moved away or lifted from the framework in order to allow mounting of an endless closed wire loop band 4 indicated by dash-dotted line around and over a number of rolls to be discussed below mounted on such chassis.
Two pairs of arms 5 are pivot mounted at cross members 6 secured between uprights 7 of the chassis 3.
The arms 5 have at their outer ends bearings 8 engaging shaft ends 9 of a first and a second roll 10 and 11 respectively.
Between brackets 12 at the uprights 7 and abutments 13 on each of the arms 5 are arranged adjustable setting or controlling mechanisms 14, in preferred embodiment contituted by threaded screw means co-operating with a tooth arrangement in turn biassed by step-motion motors. 15 indicates sleeves protecting the setting means.
Above the crossmembers 6 are mounted a loop tension adjusting apparatus 16 including a free running roll 17 swingably carried by an arm arrangement 18 biassed by a pressure medium operated piston and cylinder device 19. A doctor knife 20 is attached thereto and adapted to remove any pulp residues brought by the loop 4 and deposited on the surface of the roll 17.
Opposite the tension adjustment roll 17 is mounted a loop directing and alingning roll 21 having servo means 22 for changing the position of the roll relatively to adjoining rolls 17 and 10 in order to keep the wire loop within a correct track or path.
Carried by the machine framework 2 are two vacuum boxes 23 and 24 engaging the downwardly facing side of the wire 1 and de-watering the, not shown, web of pulp thereon. The vacuum boxes 23 and 24 are mounted close to the rolls 10 and 11 for removing water seeping from the web adjacent the rolls 10 and 11.
Between the said vacuum boxes, there is a vacuum box device 25 facing the other way, i.e. downwardly and engaging - through the wire loop gauze - the top side of the web carried by the wire 1. Said vacuum box device includes a box like structure suspended by links 26 by the arms 5 each carrying a roll 10 or 11. Thereby the movements and positions of the box device 25 is closely connected to the movements and positions of the two rolls 10 and 11. The construction is so arranged that the tangential planes at the downwardly facing side of the two rolls 10 and 11 and the upwardly facing sides of the vacuum boxes 23 and 24 and the downwardly facing side of the vacuum box arrangement 25 will be essentially aligned to create little resistance to the passage of the wire and pulp yet effectively tension the upper and lower wires through between the two rolls. The degree of tension dependent on type of end product.
The vacuum box arrangement 25 includes three chambers 25a, 25b and 25c indicated by the presence of vacuum meters 27 and inspection plugs. The suction opening of the box 25a being the first to encounter the moving pulp or stock web on the wire 1 is rather short seen in the direction of movement and is intended to keep a water barrier stationary at the leading edge of the vacuum box device 25 intended to function as a liquid sealing preventing the sucking in of air into the box chambers thereby reducing the function of the vacuum chambers. It is essential to keep such a water barrier all the times during the operation of a wire machine.
The closed felt wire loop 4 is of conventional type. Of the two rolls 10 and 11 - in the preferred embodiment - the first one is of lattice or perforated type having a mantle surface presenting a large number of openings or perforations allowing water which has passed through the wire loop to proceed inwardly without any obstructions. This feature is of importance for the smooth entering of the web of pulp into the confined space between the lower wire and the upper wire loop.
The second roll 11 is the drive roll and is covered by a high friction surface material such as rubber or the like in order to without slip pull the wire loop around the other rolls.
As can be seen in Fig. 3 the wire loop arrangement is adaped to be separately driven and there exists no mechanical connection between the driving system of the lower wire and the upper wire loop respectively. A speed sensor or tachometer 28 is arranged to sense the speed of the wire 1 and send signals to a control central 29 in turn governing the drive motor 30 of the upper wire 4. References 31, 32, and 33 indicate connection to the mains, power control and rectifiers, which deliver power to tyristor devices 34 in turn controlled from the tachometer 28 and the control desk
The vacuum boxes below the wire 1 are connected to the vacuum source of the basic wire apparatus as indicated by lines 36. The inverted vacuum box device 25 is connected to its own vacuum source 37, which preferably is of fan type.
For keeping deposits away from the different rolls and also from the wire loop 4 there are arranged a number of spraying nozzles 36 of per se known types, viz. oscillating spray pipes.
Claims
1. Top wire device intended to co-operate with a wire machine, including a movable permeable wire carried by a forming table structure and intended to receive and forward pulp or stock material deposited onto such wire as an elongated web thereon, said web adapted to be formed and de-watered during the passage of the wire along the table structure and by de-watering means attached thereto, and a top wire forming device and arranged above the web carrying wire conveyance c h a r a c t e r i z e d by at least two rolls (10 and 11) carrying and guiding an endless permeable wire loop (4) one portion of which is arranged to be essentially parallel with the web carrying wire (1) and to engage the upwardly facing surface of such web for forming same, the roll (19) being the first to meet the moving web having a perforated or lattice like mantle or casing allowing water to escape therethrough, at least two vacuum boxes or like suction means (23, 24) arranged below the web carrying wire (1) adjacent the two wire loop (4) carrying rolls (19, 11) and one vacuum device or the like means (25) arranged between said rolls above the said parallel portion to draw water away upwardly from the web (1), said vacuum device having a suction segment (25a) adapted to form and hold a standing wave or body of water escaped from the web at the edge of the vacuum device (25) facing the direction of movement of the web.
2. Top wire device according to claim 1, c h a r a c t e r i z e d by a loop tension adjusting roll (17) arranged above the two rolls (10, 11) inside the wire loop (4) .
3. Top wire device according to claims 1 and 2, c h a r a c t e r i z e d by a wire loop aligning and adjusting roll (21) arranged, in the direction of travel of the wire, after the tension ensuring roll (17).
4. Top wire device according to claim 1, c h a r a c t e r i z e d in at least one doctor knife arranged at at least one roll for removing material deposited thereon.
5. Top wire device according to claim 1, c h a r a c t e r i z e d in oscillating spraying nozzles being arranged for removing material deposited on the rolls or the wire (4) .
6. Top wire device according to claim 1, c h a r a c t e r i z e d in a chassis having movable arms (5) for adjustably carrying the loop engaging rolls (10, 11).
7. Top wire device according to claim 6, c h a r a c t e r i z e d in adjusting means (13-15) being coupled between the movable roll carrying arms 5) and the chassis for adjusting the position of the rolls (10, 11) relatively to the forming table carried wire (1) .
8. Top wire device according to claim 7, c h a r a c t e r i z e d in that the vaccum box device having at least two separate sections, (25a, 25b, 25c) is adjustably carried by coupling means connected to the arms (5) carrying the two loop engaging rolls (10, 11) in order to make the said vacuum box device move in unison with the two rolls.
9. Top wire device according to claim 1, c h a r a c t e r i z e d in that the chassis (3) carrying the rolls (10, 11) and the wire loop (4) enclosing same has detachable connecting means for separating or moving one side of the chassis from the forming table structure (2) carrying same for facilitating the replacing of the wire loop (4).
10. Top wire device according to claim 1, c h a r a c t e r i z e d in that a driving motor system for the wire loop (4) is arranged and governed by means sensing the rate of movement of the web carrying wire (1) advancing along the forming table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SE1991/000146 WO1992014880A1 (en) | 1991-02-25 | 1991-02-25 | Top wire device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SE1991/000146 WO1992014880A1 (en) | 1991-02-25 | 1991-02-25 | Top wire device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1992014880A1 true WO1992014880A1 (en) | 1992-09-03 |
Family
ID=20381644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1991/000146 WO1992014880A1 (en) | 1991-02-25 | 1991-02-25 | Top wire device |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1992014880A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105544269A (en) * | 2015-12-10 | 2016-05-04 | 周妙思 | Non-driven top-wire former |
| CN110735351A (en) * | 2019-11-21 | 2020-01-31 | 中冶美利云产业投资股份有限公司 | fourdrinier paper-making machine with top-wire former |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2951183C2 (en) * | 1979-12-19 | 1984-05-10 | Andreas Kufferath KG, 5160 Düren | Device for influencing a pre-drained fiber suspension |
| WO1986004368A1 (en) * | 1985-01-28 | 1986-07-31 | Valmet Oy | Procedure and means for improving the papermaking process on a fourdrinier wire section |
-
1991
- 1991-02-25 WO PCT/SE1991/000146 patent/WO1992014880A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2951183C2 (en) * | 1979-12-19 | 1984-05-10 | Andreas Kufferath KG, 5160 Düren | Device for influencing a pre-drained fiber suspension |
| WO1986004368A1 (en) * | 1985-01-28 | 1986-07-31 | Valmet Oy | Procedure and means for improving the papermaking process on a fourdrinier wire section |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105544269A (en) * | 2015-12-10 | 2016-05-04 | 周妙思 | Non-driven top-wire former |
| CN110735351A (en) * | 2019-11-21 | 2020-01-31 | 中冶美利云产业投资股份有限公司 | fourdrinier paper-making machine with top-wire former |
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