EP1975312A1 - Method and apparatus in a paper or board machine for confining pulp flow from the headbox - Google Patents
Method and apparatus in a paper or board machine for confining pulp flow from the headbox Download PDFInfo
- Publication number
- EP1975312A1 EP1975312A1 EP08397506A EP08397506A EP1975312A1 EP 1975312 A1 EP1975312 A1 EP 1975312A1 EP 08397506 A EP08397506 A EP 08397506A EP 08397506 A EP08397506 A EP 08397506A EP 1975312 A1 EP1975312 A1 EP 1975312A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deckle
- wire
- support
- headbox
- liquid
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000005461 lubrication Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000012423 maintenance Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Images
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
- D21F1/56—Deckle frame arrangements
Definitions
- the invention relates to a method according to the preamble of claim 1 in a paper or board machine for confining a pulp flow coming from the headbox, in which by at least one deckle part being above the wire in the operating position the pulp flow coming from the headbox is confined in the lateral direction in the edge area of the wire.
- the invention also relates to an apparatus according to the preamble of claim 11 in a paper or board machine for confining a pulp flow coming from the headbox, which apparatus comprises at least one deckle part being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of the wire.
- the apparatus being the object of the invention is typically referred to as a deckle. Its function is to confine the flow of stock discharged from a slice of the headbox onto the wire in the lateral direction on the edges of the wire. The aim is thus to prevent the uncontrolled spreading of stock onto the wire immediately after the headbox. After the stock has advanced through some distance on the wire in the machine direction and a sufficient volume of water has been removed from it, this problem disappears. A common way to confine the stock flow in the lateral direction is thus to use deckles on the edges of the wire immediately after the headbox.
- a deckle apparatus is described in FI patent specification 116796B .
- Another known arrangement is described in FI patent specification 115473B .
- a problem of known prior-art arrangements is, inter alia, that the sealing effect and the lubrication properties of the deckle have proven deficient in practice and this has had an impact on the pulp as susceptibility to the formation of undulations, among others.
- the object of this invention is to further develop the arrangements of known prior art and to achieve a totally novel solution by means of which the problems of known prior art are avoided.
- the object of the invention is thus to provide an arrangement by means of which the sealing and lubrication of the deckle can be improved from earlier and thus to minimise the susceptibility to the formation of undulations.
- the method according to the invention is mainly characterised in that, in the method, by a support part impervious to liquid being below the wire together with a deckle into connection with which liquid is brought, a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle.
- the apparatus according to the invention is mainly characterised by a combination which comprises a support part impervious to liquid being below the wire and a deckle part into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle.
- the arrangement according to the invention has numerous significant advantages.
- a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle.
- the mechanical adjustments of the deckle do not change in connection with maintenance and wire change situations.
- the number of adjustment points has been substantially reduced, whereby the number of adjustments to be carried out by personnel is minimised.
- the arrangement enables an automation system to control the flow volumes of water in connection with the deckle on a quality-specific basis in accordance with speed.
- the fastening of the apparatus in the headbox is easy and it can also be automated.
- the deckle is easy to detach during a wire change from the tending side of the machine.
- the structure permits different water supply requirements at different points of the deckle.
- the structure of the deckle is sturdy. The deckle remains straight and does not get twisted and/or curved.
- Figs. 1 and 2 show an apparatus according to the invention in connection with the forming section of a paper machine.
- the figure shows only one deckle.
- the forming section is provided with two deckles, one in or in the vicinity of each edge area of the wire of the forming section.
- Fig. 6 illustrates the invention in more detail.
- the invention thus relates to a method and an apparatus in a paper or board machine for confining a pulp flow coming from the headbox 1, which apparatus comprises at least one deckle part 2 being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of the wire 3.
- the invention is characterised by a combination which comprises a support part 50 impervious to liquid being below the wire 3 and a deckle part 2 into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between the deckle board 2 and the wire 3 and intensifies the lubrication of at least one sealing surface of the deckle 2.
- the support part 50 is arranged below the wire 3 substantially at the point of the deckle 2 being above the wire 3. In the operating position, a surface of the support part 50 on the side of the wire is substantially in contact with the lower surface of the wire 3.
- the support part 50 is a substantially machine-directional (MD) strip part.
- the apparatus further comprises means for supplying water when required between the deckle i.e. deckle part 2 and the wire 3.
- On the surface of the deckle part 2 on the side of the wire 3 is formed at least one first longitudinal groove 17 in which is advantageously arranged a liquid passage 17' from the water supply means for supplying water.
- the first groove with its water supply functions, inter alia, as a sealing element.
- a second longitudinal groove which is closer to the edge of the wire 3 than the first groove 17.
- the groove typically functions, inter alia, as the collector groove of leakage pulp and leakage water, whereby the pulp and leakage water carried in it move along the wire away from the area of the forming device.
- the support part 50 ensures and intensifies the sealing effect, inter alia, by decreasing the passage of liquid through the wire 3 in the area of the deckle 2. At the same time, it ensures the effectiveness of the lubrication of parts between the deckle and the wire. Furthermore, by means of it, it is possible to intensify the conveyance of leakage pulp and leakage water between the groove 17 and the wire away from the area of the forming device. The pressure effect provided by the support part 50 effectively prevents the passage of liquid and possible pulp fibres through the wire at the point of the deckle.
- Liquid can be sprayed also with at least one spraying head 57 in a gap 53 between the deckle 2 and the wire.
- the angle can be in the range of 0-90 degrees, advantageously e.g. 30-60 degrees. Water is supplied in at least one groove 17, 18 formed in the deckle 2, opening on the side of the wire 3.
- the deckle 2 comprises one or more seal parts 52, 54 between which there is a gap or a groove 17 in which liquid is brought.
- the support part 50 is mainly planar on the side of the wire.
- the support part 50 is supported on a fastening surface 55 formed in a dewatering strip 51.
- the invention relates to an apparatus in a paper or board machine for confining a pulp flow coming from the headbox 1, which apparatus comprises at least one deckle part 2 being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of the wire 3.
- the invention is known by a combination which comprises a support part 50 impervious to liquid being below the wire 3 and a deckle part 2 into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between the deckle board 2 and the wire 3 and intensifies the lubrication of at least one sealing surface of the deckle 2.
- the support part 50 is arranged below the wire 3 substantially at the point of the deckle 2 being above the wire 3.
- the support part 50 is a substantially machine-directional (MD) strip part.
- openings 17' from which water is brought between the deckle 2 and the wire 3.
- the openings 17' which are directed to spray water between the deckle 2 and the wire 3 at an angle ⁇ (alpha) from a perpendicular direction in relation to the plane of the wire 3 inclined in the travel direction of the wire.
- the deckle 2 typically comprises one or more seal parts 52, 54 between which there is a gap or a groove 17 in which liquid is brought.
- the surface of the deckle part 2 on the side of the wire 3 is formed oblique, whereby between the wire 3 and the deckle part there is on the side of the edge of the wire a gap 53 which narrows in the cross machine direction at least towards one seal part 54.
- the apparatus comprises at least one spray nozzle 57 for spraying liquid in the gap 53 between the deckle part 2 and the wire.
- water can be sprayed with the nozzle 57 which is directed to spray towards the gap 53 between the wire 3 and the deckle 2.
- the deckle i.e. deckle part 2 is arranged to be movably supported in the longitudinal machine direction and the deckle part 2 further comprises a fastening point 21 at which the deckle part 2 is fastened in the operating position substantially immovable at least in the longitudinal direction of the machine.
- the fastening point 21 of the deckle part 2 is at or in the vicinity of the end on the side of the headbox 1.
- the fastening point can thus also be located in a support structure 1' on the side of the headbox.
- the support elements of the deckle comprise a support body 4 in which the deckle part 2 is arranged to be movably supported, particularly slidingly supported, in the longitudinal machine direction.
- the deckle part is arranged e.g. a groove 15, such as a dovetail groove, in which a counter part 16 of the support element 4 is arranged to fit.
- a groove 15 such as a dovetail groove
- the groove and the counter part can also exist the other way around, whereby the groove is in the support element and the counter part in the deckle part.
- the deckle part 2 is supported by a side wall 2' facing away from the pulp web.
- the support body 4 of the deckle is arranged movable between at least two positions, a first position i.e. operating position in which position the deckle confines the pulp flow in the lateral direction, and a second position i.e. maintenance position in which position the deckle has been moved upwards at least to a distance from the surface of the wire 3.
- the figures show the deckle in the operating position.
- the support body 4 is arranged to be movable by at least one actuator 9 between the first position and the second position.
- the moving devices of the support body 4 typically comprise a support part 5 which is arranged in a support structure 6 or equivalent of the machine, and a first support arm 7 which is rotatably arranged in the support part around an axis 8 crosswise in the machine direction, and further an actuator 9 which is arranged to move the support arm 7, in which support arm the support body 4 is arranged to be rotatable around a second crosswise axis 10.
- This arrangement allows the motion of the deckle part away from the headbox and upwards from the plane of the wire when being moved to the second position. In the second position, the deckle part 2 has thus been moved in the machine direction away from the headbox 1 and upwards from the plane of the wire 3.
- the moving devices of the support body 4 comprise at least one adjustable stopper part 12 and a stop surface 13 for it, against which stopper the stop surface sets at least in the operating position.
- the stopper part 12 is a screw part.
- the fastening point 21 of the deckle part 2 advantageously comprises a form-locking joint 22, 23 for locking the deckle part also in the cross direction.
- FIG. 1 , 2 , 3 show some dewatering elements over which the wire 3 runs.
- the deckle part 2 of the deckle is most suitably fastened in the actuator only at the end on the side of the headbox 1, whereby the longitudinal motion of the machine and variations in the distribution of temperature along the length of the deckle have no effect on the deformation of the deckle, but the deckle is able to move freely in the machine direction on the support in the longitudinal machine direction.
- the longitudinal support of the deckle in the elevation of the deckle is arranged such that the deckle cannot be twisted around the centre of its cross profile and then the edge of the web being screened remains stable in the vertical direction.
- the deckle 2 is slidably supported in its support elements 4 typically substantially for the entire length of the deckle 2.
- the support element 4 is fastened on the side walls of the headbox 1 or some other support element 1' typically by only one fastening in the longitudinal machine direction.
- the fastening can easily be changed into an automatically operated locking.
- the lock is e.g. an eyebolt which the operator opens into the open position before maintenance operations.
- the basic settings of the deckle 2 at the end on the side of the headbox undergo no change after a wire change and a washing shutdown, but the end of the deckle always assumes the same position in relation to the headbox 1.
- the support of the deckle at the end of the headbox only allows vertical motion for adjusting the gap between the deckle and the wire.
- the deckle is set in a known manner in relation to the side wall of the headbox, and there is no need to change this adjustment during operation. Only a vertical adjustment parameter is determined during the run event. For the duration of the adjustment event, the locking of the headbox is loosened and the adjustment is made at the point of the first support element.
- the locking on the side of the headbox also allows the toe-in of the deckle 2 to change in relation to the web (positive toe-in), whereby the deckle moves away from the web in the travel direction of the web or alternatively approaches the web if the toe-in is negative.
- the fastening of the headbox also allows the deckle mechanism to move away and simultaneous vertical motion, advantageously rotational motion, away from the headbox and, correspondingly in a closing situation when in the lower position, the deckle assumes its position corresponding to the starting situation and is locked in place in the longitudinal machine direction.
- the control mechanism is advantageously a wedge coupling being wedge-shaped or having a surface of revolution, which guides the parts against each other in the cross and longitudinal machine direction, while the vertical direction is free and locked by a frictional locking after the maintenance operation.
- the support body 4 is advantageously a relatively rigid profiled beam, advantageously a tubular beam, having a length at least substantially equal to that of the deckle part 2, sliding fastening 15, 16 of the deckle 2 being located on a side surface of the beam.
- the support body receives the pressure and flow force components produced by the pulp web.
- the support body advantageously its beam structure, retains its direction and does not bend laterally or vertically contrary to the process values.
- the support body 4 can be arranged or it can form a channel or several channels for conveying lubrication and sealing water to the deckle 2.
- lubrication, sealing or boundary lubrication water lines 30, and likewise an external spraying nozzle 31, by means of which desired mediums, particularly liquid mediums, can be applied over the length of the deckle 2, most suitably by zones.
- the adjustments of the support body 4 are implemented in a space between the support body 4 and the support structure of the wire, such as a body beam 6.
- a body beam 6 of the wire there is a fastening surface for dewatering elements, and the moving and adjustment apparatus of the deckle can be supported on the same fastening surface.
- the adjusting device comprises a moving mechanism, advantageously a lever mechanism 7, 8, 9, 10, by means of which the support body 4 and the deckle part 2 are lifted and moved aside from the fastening of the headbox and the surface of the wire 3.
- the upward motion of the lever mechanism 7 and the distance of the deckle from the surface of the wire are limited by a stopper/adjuster 12, 13, suitably adjusting/locking screws.
- the deckle can be adjusted in a known manner to a somewhat different distance from the surface of the wire according to the travel direction of the web such that the trailing end of the deckle is higher than the end on the side of the headbox. It is also possible that the deckle 2 is at a constant distance from the surface of the wire, depending on the other run parameters of the machine.
- the deckle part can be easily lifted to a maintenance position. This can be done particularly during the washing of the deckle and the wire change. For the time of the wire change, the support body of the deckle can be very easily detached from the lever mechanism from the tending side of the machine and lifted onto the machine aisle by means of an overhead crane.
- the lifting points are located in an advantageous place in the structure and the rigidity of the structure is such that the lifting event will not harm the deckle itself in any way, which is a problem of known fastening mechanisms.
- the parts When remounted, the parts assume the same positions from which they were detached, whereby changes in personnel will not change the adjustments.
- the deckle adjustments are only influenced by changes in water flow in the process which can be determined quality-specifically for each quality. This has not been possible to implement earlier with the obsolete deckle structure.
- the moving mechanism also includes an actuator 9, in the embodiment of the figure bellows (in Figs. 1 and 2 three bellows on either side of the machine).
- the actuator 9 can be any pressure-medium operated device or electric device.
- the structure typically requires at least one actuator 9 on either side of the machine. Depending on the length of the support structure 4, there are at least two support points on either side of the machine.
- the position of the forward end of the deckle 2 in relation to the surface of the wire 3 is adjusted by means of the support structure on the side of the headbox 1.
- depth adjustment by means of which the distance of the deckle is adjusted in relation to the centre line of the machine, either straight or toe-in. After basic adjustments, the machine personnel will not touch the settings, only the water flow values are changed.
- the device according to the invention can be used in connection with an automatic control system (not shown in the figure).
- the structure includes local control boxes on the tending and operating side of the machine, not shown in the figure.
- the automation system of the machine contains quality-specific run parameters for the water supplies of the deckle.
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Abstract
Description
- The invention relates to a method according to the preamble of
claim 1 in a paper or board machine for confining a pulp flow coming from the headbox, in which by at least one deckle part being above the wire in the operating position the pulp flow coming from the headbox is confined in the lateral direction in the edge area of the wire. - The invention also relates to an apparatus according to the preamble of
claim 11 in a paper or board machine for confining a pulp flow coming from the headbox, which apparatus comprises at least one deckle part being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of the wire. - The apparatus being the object of the invention is typically referred to as a deckle. Its function is to confine the flow of stock discharged from a slice of the headbox onto the wire in the lateral direction on the edges of the wire. The aim is thus to prevent the uncontrolled spreading of stock onto the wire immediately after the headbox. After the stock has advanced through some distance on the wire in the machine direction and a sufficient volume of water has been removed from it, this problem disappears. A common way to confine the stock flow in the lateral direction is thus to use deckles on the edges of the wire immediately after the headbox. A deckle apparatus is described in
FI patent specification 116796B FI patent specification 115473B - The object of this invention is to further develop the arrangements of known prior art and to achieve a totally novel solution by means of which the problems of known prior art are avoided. The object of the invention is thus to provide an arrangement by means of which the sealing and lubrication of the deckle can be improved from earlier and thus to minimise the susceptibility to the formation of undulations.
- The method according to the invention is mainly characterised in that, in the method, by a support part impervious to liquid being below the wire together with a deckle into connection with which liquid is brought, a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle.
- In addition, the method according to the invention is characterised by what is stated in claims 2-10.
- The apparatus according to the invention is mainly characterised by a combination which comprises a support part impervious to liquid being below the wire and a deckle part into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle.
- The apparatus according to the invention is further characterised by what is stated in claims 12-28.
- The arrangement according to the invention has numerous significant advantages. By the support part impervious to liquid being below the wire together with the deckle into connection with which liquid is brought, a pressure effect is provided which furthers the sealing between the deckle board and the wire and intensifies the lubrication of at least one sealing surface of the deckle. Then, it has been possible to reduce or even completely prevent the formation of edge undulations and to reduce the range of basis weight variation in the edge area of the machine. Correspondingly, it has been possible to make the width of the edge area of reduced basis weight narrower. The runnability of the machine is improved and the width of the pulp web can be increased, whereby productivity is improved. The mechanical adjustments of the deckle do not change in connection with maintenance and wire change situations. The number of adjustment points has been substantially reduced, whereby the number of adjustments to be carried out by personnel is minimised. The arrangement enables an automation system to control the flow volumes of water in connection with the deckle on a quality-specific basis in accordance with speed. The fastening of the apparatus in the headbox is easy and it can also be automated. The deckle is easy to detach during a wire change from the tending side of the machine. The structure permits different water supply requirements at different points of the deckle. The structure of the deckle is sturdy. The deckle remains straight and does not get twisted and/or curved.
- Next, the invention will be described in detail by means of an example with reference to the accompanying drawing in which
-
Fig. 1 shows a side view of an apparatus according to the invention, -
Fig. 2 shows a top view of the apparatus ofFig. 1 , -
Fig. 3 shows a magnified view of section B-B ofFig. 1 , -
Fig. 4 shows a magnified view of detail A ofFig. 1 , -
Fig. 5 shows a magnified view of detail D ofFig. 2 , and -
Fig. 6 shows a magnified view of detail ofFig. 3 . -
Figs. 1 and2 show an apparatus according to the invention in connection with the forming section of a paper machine. The figure shows only one deckle. Typically, the forming section is provided with two deckles, one in or in the vicinity of each edge area of the wire of the forming section.Fig. 6 illustrates the invention in more detail. - The invention thus relates to a method and an apparatus in a paper or board machine for confining a pulp flow coming from the
headbox 1, which apparatus comprises at least onedeckle part 2 being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of thewire 3. The invention is characterised by a combination which comprises asupport part 50 impervious to liquid being below thewire 3 and adeckle part 2 into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between thedeckle board 2 and thewire 3 and intensifies the lubrication of at least one sealing surface of thedeckle 2. - The
support part 50 is arranged below thewire 3 substantially at the point of thedeckle 2 being above thewire 3. In the operating position, a surface of thesupport part 50 on the side of the wire is substantially in contact with the lower surface of thewire 3. Thesupport part 50 is a substantially machine-directional (MD) strip part. - The apparatus further comprises means for supplying water when required between the deckle i.e.
deckle part 2 and thewire 3. On the surface of thedeckle part 2 on the side of thewire 3 is formed at least one firstlongitudinal groove 17 in which is advantageously arranged a liquid passage 17' from the water supply means for supplying water. The first groove with its water supply functions, inter alia, as a sealing element. - On the surface of the
deckle part 2 on the side of thewire 3 can also have been formed a second longitudinal groove which is closer to the edge of thewire 3 than thefirst groove 17. The groove typically functions, inter alia, as the collector groove of leakage pulp and leakage water, whereby the pulp and leakage water carried in it move along the wire away from the area of the forming device. - The
support part 50 ensures and intensifies the sealing effect, inter alia, by decreasing the passage of liquid through thewire 3 in the area of thedeckle 2. At the same time, it ensures the effectiveness of the lubrication of parts between the deckle and the wire. Furthermore, by means of it, it is possible to intensify the conveyance of leakage pulp and leakage water between thegroove 17 and the wire away from the area of the forming device. The pressure effect provided by thesupport part 50 effectively prevents the passage of liquid and possible pulp fibres through the wire at the point of the deckle. - Between the
deckle 2 and thewire 3 is brought water from openings 17' arranged in the deckle. Liquid can be sprayed also with at least one sprayinghead 57 in agap 53 between thedeckle 2 and the wire. - Between the
deckle 2 and thewire 3 is brought water from the openings 17' arranged in the deckle, whereby water is supplied at an angle α (alpha) from a perpendicular direction in relation to the plane of thewire 3 inclined in the travel direction of the wire. The angle can be in the range of 0-90 degrees, advantageously e.g. 30-60 degrees. Water is supplied in at least onegroove 17, 18 formed in thedeckle 2, opening on the side of thewire 3. - The
deckle 2 comprises one ormore seal parts groove 17 in which liquid is brought. - The
support part 50 is mainly planar on the side of the wire. - The
support part 50 is supported on afastening surface 55 formed in adewatering strip 51. - The invention relates to an apparatus in a paper or board machine for confining a pulp flow coming from the
headbox 1, which apparatus comprises at least onedeckle part 2 being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of thewire 3. The invention is known by a combination which comprises asupport part 50 impervious to liquid being below thewire 3 and adeckle part 2 into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between thedeckle board 2 and thewire 3 and intensifies the lubrication of at least one sealing surface of thedeckle 2. - The
support part 50 is arranged below thewire 3 substantially at the point of thedeckle 2 being above thewire 3. Thesupport part 50 is a substantially machine-directional (MD) strip part. In thedeckle 2 are arranged openings 17' from which water is brought between thedeckle 2 and thewire 3. - In the
deckle 2 are arranged the openings 17' which are directed to spray water between thedeckle 2 and thewire 3 at an angle α (alpha) from a perpendicular direction in relation to the plane of thewire 3 inclined in the travel direction of the wire. - In the apparatus, water is supplied in at least one
groove 17 formed in thedeckle 2, opening on the side of thewire 3. Thedeckle 2 typically comprises one ormore seal parts groove 17 in which liquid is brought. - According to an advantageous embodiment, the surface of the
deckle part 2 on the side of thewire 3 is formed oblique, whereby between thewire 3 and the deckle part there is on the side of the edge of the wire agap 53 which narrows in the cross machine direction at least towards oneseal part 54. The apparatus comprises at least onespray nozzle 57 for spraying liquid in thegap 53 between thedeckle part 2 and the wire. In accordance to an advantageous embodiment of the arrangement according to the invention, water can be sprayed with thenozzle 57 which is directed to spray towards thegap 53 between thewire 3 and thedeckle 2. There can benozzles 57 at suitable intervals divided on the length of thedeckle 2. Correspondingly, there are openings inside the deckle arranged dividedly on the length of the deckle according to the target of application. - In the embodiment of the figures, the deckle i.e. deckle
part 2 is arranged to be movably supported in the longitudinal machine direction and thedeckle part 2 further comprises afastening point 21 at which thedeckle part 2 is fastened in the operating position substantially immovable at least in the longitudinal direction of the machine. According to an advantageous embodiment, thefastening point 21 of thedeckle part 2 is at or in the vicinity of the end on the side of theheadbox 1. The fastening point can thus also be located in a support structure 1' on the side of the headbox. The support elements of the deckle comprise asupport body 4 in which thedeckle part 2 is arranged to be movably supported, particularly slidingly supported, in the longitudinal machine direction. Typically, in the deckle part is arranged e.g. agroove 15, such as a dovetail groove, in which acounter part 16 of thesupport element 4 is arranged to fit. Naturally, the groove and the counter part can also exist the other way around, whereby the groove is in the support element and the counter part in the deckle part. In the embodiment of the figure, thedeckle part 2 is supported by a side wall 2' facing away from the pulp web. - The
support body 4 of the deckle is arranged movable between at least two positions, a first position i.e. operating position in which position the deckle confines the pulp flow in the lateral direction, and a second position i.e. maintenance position in which position the deckle has been moved upwards at least to a distance from the surface of thewire 3. The figures show the deckle in the operating position. Thesupport body 4 is arranged to be movable by at least oneactuator 9 between the first position and the second position. - The moving devices of the
support body 4 typically comprise asupport part 5 which is arranged in asupport structure 6 or equivalent of the machine, and afirst support arm 7 which is rotatably arranged in the support part around anaxis 8 crosswise in the machine direction, and further anactuator 9 which is arranged to move thesupport arm 7, in which support arm thesupport body 4 is arranged to be rotatable around a secondcrosswise axis 10. This arrangement allows the motion of the deckle part away from the headbox and upwards from the plane of the wire when being moved to the second position. In the second position, thedeckle part 2 has thus been moved in the machine direction away from theheadbox 1 and upwards from the plane of thewire 3. - The moving devices of the
support body 4 comprise at least oneadjustable stopper part 12 and astop surface 13 for it, against which stopper the stop surface sets at least in the operating position. In the embodiment ofFig. 4 , thestopper part 12 is a screw part. - The
fastening point 21 of thedeckle part 2 advantageously comprises a form-locking joint 22, 23 for locking the deckle part also in the cross direction. - Typically, there are thus on each side of the machine two deckle mechanisms operating independently on the fourdinier wire of the forming section. The figure shows part of the headbox diagrammatically. Of the forming section,
Figs. 1 ,2 ,3 show some dewatering elements over which thewire 3 runs. Thedeckle part 2 of the deckle is most suitably fastened in the actuator only at the end on the side of theheadbox 1, whereby the longitudinal motion of the machine and variations in the distribution of temperature along the length of the deckle have no effect on the deformation of the deckle, but the deckle is able to move freely in the machine direction on the support in the longitudinal machine direction. The longitudinal support of the deckle in the elevation of the deckle is arranged such that the deckle cannot be twisted around the centre of its cross profile and then the edge of the web being screened remains stable in the vertical direction. - The
deckle 2 is slidably supported in itssupport elements 4 typically substantially for the entire length of thedeckle 2. Thesupport element 4 is fastened on the side walls of theheadbox 1 or some other support element 1' typically by only one fastening in the longitudinal machine direction. The fastening can easily be changed into an automatically operated locking. In the embodiment of the figures, the lock is e.g. an eyebolt which the operator opens into the open position before maintenance operations. - In the arrangement according to the invention, the basic settings of the
deckle 2 at the end on the side of the headbox undergo no change after a wire change and a washing shutdown, but the end of the deckle always assumes the same position in relation to theheadbox 1. The support of the deckle at the end of the headbox only allows vertical motion for adjusting the gap between the deckle and the wire. In the preassembly, the deckle is set in a known manner in relation to the side wall of the headbox, and there is no need to change this adjustment during operation. Only a vertical adjustment parameter is determined during the run event. For the duration of the adjustment event, the locking of the headbox is loosened and the adjustment is made at the point of the first support element. The locking on the side of the headbox also allows the toe-in of thedeckle 2 to change in relation to the web (positive toe-in), whereby the deckle moves away from the web in the travel direction of the web or alternatively approaches the web if the toe-in is negative. In a maintenance situation, the fastening of the headbox also allows the deckle mechanism to move away and simultaneous vertical motion, advantageously rotational motion, away from the headbox and, correspondingly in a closing situation when in the lower position, the deckle assumes its position corresponding to the starting situation and is locked in place in the longitudinal machine direction. The control mechanism is advantageously a wedge coupling being wedge-shaped or having a surface of revolution, which guides the parts against each other in the cross and longitudinal machine direction, while the vertical direction is free and locked by a frictional locking after the maintenance operation. - The
support body 4 is advantageously a relatively rigid profiled beam, advantageously a tubular beam, having a length at least substantially equal to that of thedeckle part 2, slidingfastening deckle 2 being located on a side surface of the beam. The support body receives the pressure and flow force components produced by the pulp web. The support body, advantageously its beam structure, retains its direction and does not bend laterally or vertically contrary to the process values. Thesupport body 4 can be arranged or it can form a channel or several channels for conveying lubrication and sealing water to thedeckle 2. In the support body, there can be externally fastened one or more lubrication, sealing or boundarylubrication water lines 30, and likewise anexternal spraying nozzle 31, by means of which desired mediums, particularly liquid mediums, can be applied over the length of thedeckle 2, most suitably by zones. - The adjustments of the
support body 4 are implemented in a space between thesupport body 4 and the support structure of the wire, such as abody beam 6. As is known, on thebody beam 6 of the wire there is a fastening surface for dewatering elements, and the moving and adjustment apparatus of the deckle can be supported on the same fastening surface. The adjusting device comprises a moving mechanism, advantageously alever mechanism support body 4 and thedeckle part 2 are lifted and moved aside from the fastening of the headbox and the surface of thewire 3. The upward motion of thelever mechanism 7 and the distance of the deckle from the surface of the wire are limited by a stopper/adjuster deckle 2 is at a constant distance from the surface of the wire, depending on the other run parameters of the machine. The deckle part can be easily lifted to a maintenance position. This can be done particularly during the washing of the deckle and the wire change. For the time of the wire change, the support body of the deckle can be very easily detached from the lever mechanism from the tending side of the machine and lifted onto the machine aisle by means of an overhead crane. The lifting points are located in an advantageous place in the structure and the rigidity of the structure is such that the lifting event will not harm the deckle itself in any way, which is a problem of known fastening mechanisms. When remounted, the parts assume the same positions from which they were detached, whereby changes in personnel will not change the adjustments. The deckle adjustments are only influenced by changes in water flow in the process which can be determined quality-specifically for each quality. This has not been possible to implement earlier with the obsolete deckle structure. - There is no need to detach the support and adjustment mechanisms above the
body 6 of the wire, and the deckle on the tending side of the machine need not be detached in any way from the support structure. On the operating side of the machine, only the fastening of the headbox is detached and the deckle is lifted up automatically. The moving mechanism also includes anactuator 9, in the embodiment of the figure bellows (inFigs. 1 and2 three bellows on either side of the machine). Theactuator 9 can be any pressure-medium operated device or electric device. The structure typically requires at least oneactuator 9 on either side of the machine. Depending on the length of thesupport structure 4, there are at least two support points on either side of the machine. The position of the forward end of thedeckle 2 in relation to the surface of thewire 3 is adjusted by means of the support structure on the side of theheadbox 1. In the support structure, there also is depth adjustment, by means of which the distance of the deckle is adjusted in relation to the centre line of the machine, either straight or toe-in. After basic adjustments, the machine personnel will not touch the settings, only the water flow values are changed. - The device according to the invention can be used in connection with an automatic control system (not shown in the figure). Then, the structure includes local control boxes on the tending and operating side of the machine, not shown in the figure. Furthermore, the automation system of the machine contains quality-specific run parameters for the water supplies of the deckle.
- It is obvious to those skilled in the art that the invention is not limited to the embodiments described above, but it may be varied within the scope of the enclosed claims. When necessary, the features possibly described in this specification together with other features may also be used separately from each other.
Claims (28)
- A method in a paper or board machine for confining a pulp flow coming from the headbox (1), in which by at least one deckle part (2) being above the wire in the operating position the pulp flow coming from the headbox is confined in the lateral direction in the edge area of the wire (3), characterised in that, in the method, by a support part (50) impervious to liquid being below the wire (3) together with the deckle into connection with which liquid is brought, a pressure effect is provided which furthers the sealing between the deckle boards (2) and the wire (3) and intensifies the lubrication of at least one sealing surface of the deckle (2).
- A method according to claim 1, characterised in that the support part (50) is arranged below the wire substantially at the point of the deckle (2) being above the wire (3).
- A method according to claim 1 or 2, characterised in that the support part (50) is a substantially machine-directional (MD) strip part.
- A method according to any one of claims 1-3, characterised in *that between the deckle (2) and the wire (3) is brought water from openings (17') arranged in the deckle.
- A method according to any one of claims 1-4, characterised in that between the deckle (2) and the wire (3) is brought water from the openings (17') arranged in the deckle, whereby water is supplied at an angle α (alpha) from a perpendicular direction in relation to the plane of the wire (3) inclined in the travel direction of the wire.
- A method according to any one of claims 1-5, characterised in that water is supplied in at least one groove (17) formed in the deckle (2), opening on the side of the wire (3).
- A method according to any one of claims 1-6, characterised in that the deckle (2) comprises one or more seal parts (52, 54) between which there is a gap or a groove (17) in which liquid is brought.
- A method according to any one of claims 1-7, characterised in that liquid is sprayed with at least one spraying head (57) in the gap (53) between the deckle (2) and the wire.
- A method according to any one of claims 1-8, characterised in that the support part (50) is mainly planar on the side of the wire.
- A method according to any one of claims 1-9, characterised in that the support part (50) is supported in a fastening surface (55) formed in a dewatering strip (51).
- An apparatus in a paper or board machine for confining a pulp flow coming from the headbox (1), which apparatus comprises at least one deckle part (2) being above the wire which in the operating position is arranged to confine the pulp flow coming from the headbox in the lateral direction in the edge area of the wire (3), characterised by a combination which comprises a support part (50) impervious to liquid being below the wire (3) and the deckle part (2) into connection with which liquid is brought such that a pressure effect is provided which furthers the sealing between the deckle board (2) and the wire (3) and intensifies the lubrication of at least one sealing surface of the deckle (2).
- An apparatus according to claim 11, characterised in that the support part (50) is arranged below the wire (3) substantially at the point of the deckle (3) being above the wire (3).
- An apparatus according to claim 11 or 12, characterised in that the support part (50) is a substantially machine-directional (MD) strip part.
- An apparatus according to any one of claims 11-13, characterised in that in the deckle (2) are arranged openings (17') from which water is brought between the deckle (2) and the wire (3).
- An apparatus according to any one of claims 11-14, characterised in that in the deckle (2) are arranged the openings (17') which are directed to spray water between the deckle (2) and the wire (3) at an angle α (alpha) from a perpendicular direction in relation to the plane of the wire (3) inclined in the travel direction of the wire.
- An apparatus according to any one of claims 11-15, characterised in that, in the apparatus, water is supplied in at least one groove (17, 18) formed in the deckle (2), opening on the side of the wire (3).
- An apparatus according to any one of claims 11-16, characterised in that the deckle (2) comprises one or more seal parts (52, 54) between which there is a gap or a groove (17) in which liquid is brought.
- An apparatus according to any one of claims 11-17, characterised in that a fastening point (21) of the deckle part (2) at or in the vicinity of the end on the side of the headbox (1).
- An apparatus according to any one of claims 11-18, characterised in that the support elements of the deckle comprise a support body (4) in which the deckle part is arranged in the longitudinal machine direction movably supported, particularly slidingly supported.
- An apparatus according to any one of claims 11-19, characterised in that the support body (4) of the deckle is arranged movable between at least two positions, a first position i.e. operating position in which position the deckle confines the pulp flow in the lateral direction, and a second position i.e. maintenance position in which position the deckle has been moved upwards at least to a distance from the surface of the wire (3).
- An apparatus according to any one of claims 11-20, characterised in that the support body (4) is arranged movable at least by an actuator (9) between the first position and the second position.
- An apparatus according to any one of claims 11-21, characterised in that the moving devices of the support body (4) comprise a support part (5) which is arranged in a support structure (6) or equivalent of the machine and a first support arm (7) which is rotatably arranged in the support part (6) around a crosswise axis (8) of the machine, and further an actuator (9) which is arranged to move the support arm (7), in which support arm the support body (4) is arranged rotatably around a second crosswise axis (10).
- An apparatus according to any one of claims 11-22, characterised in that in the second position the deckle part (2) is moved in the machine direction away from the headbox (1) and upwards from the plane of the wire (3).
- An apparatus according to any one of claims 11-23, characterised in that the moving devices of the support body (4) comprise at least one adjustable stopper part (12) and a stop surface (13) for it, against which stopper the stop surface sets at least in the operating position.
- An apparatus according to any one of claims 11-24, characterised in that the apparatus further comprises means for supplying water between the deckle part (2) and the wire (3).
- An apparatus according to any one of claims 11-25, characterised in that on the surface of the deckle part (2) on the side of the wire (3) is formed at least one longitudinal groove (17) in which is arranged a liquid passage (17') for supplying water.
- An apparatus according to any one of claims 11-26, characterised in that the surface of the deckle part (2) on the side of the wire (3) is formed oblique, whereby between the wire (3) and the deckle part there is on the side of the edge of the wire a gap (53) which narrows in the cross machine direction at least towards one seal part (54).
- An apparatus according to any one of claims 11-27, characterised in that the apparatus comprises at least one spray nozzle (57) for spraying liquid in the gap (53) between the deckle part (2) and the wire.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20075202A FI120205B (en) | 2007-03-28 | 2007-03-28 | Method and apparatus for limiting mass flow from a headbox in a paper or board machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1975312A1 true EP1975312A1 (en) | 2008-10-01 |
Family
ID=37930112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08397506A Withdrawn EP1975312A1 (en) | 2007-03-28 | 2008-03-27 | Method and apparatus in a paper or board machine for confining pulp flow from the headbox |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080236775A1 (en) |
EP (1) | EP1975312A1 (en) |
CN (1) | CN101285279A (en) |
FI (1) | FI120205B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202011103266U1 (en) | 2011-07-16 | 2011-08-29 | Voith Patent Gmbh | A forming apparatus |
US20140328635A1 (en) * | 2013-05-02 | 2014-11-06 | Mark Regan Baluha | Conveyor product containment device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI20105026A (en) * | 2010-01-15 | 2011-07-16 | Metso Paper Inc | DEVICE FOR THE FIBING COMPONENT OF A FIBER MACHINE |
US9512565B2 (en) * | 2014-02-13 | 2016-12-06 | Ibs Of America | Deckle board system and method |
CN106835804B (en) * | 2017-02-09 | 2019-01-15 | 华南理工大学 | A kind of molding device and method in improvement l Water Paper page both sides |
CN110016830B (en) * | 2019-04-16 | 2023-06-20 | 华南理工大学 | Non-contact sealing device and method for inclined net former |
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US4968387A (en) | 1990-01-23 | 1990-11-06 | Westvaco Corporation | Papermachine deckle means |
FI115473B (en) | 2004-03-25 | 2005-05-13 | Process Flow Ltd Oy | Papermaking and cardboardmaking technique and apparatus for this |
FI116796B (en) | 2005-01-14 | 2006-02-28 | Vaahto Oy | Device in a paper or cardboard machine for limiting the mass flow from the inlet box |
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AT280035B (en) * | 1964-02-07 | 1970-03-25 | Feldmuehle Ag | Drainage bar for paper machines |
US3361620A (en) * | 1964-12-11 | 1968-01-02 | Allis Chalmers Mfg Co | Deckle assembly for a paper making machine |
US5076894A (en) * | 1990-05-04 | 1991-12-31 | Simmons Holt W | Suction box apparatus with composite cover elements mounted in slots on cross braces |
US5045154A (en) * | 1990-06-28 | 1991-09-03 | Baluha Mark R | Conveyor edge product containing device for paper making machinery |
DE19615503C2 (en) * | 1996-04-19 | 1998-10-29 | Voith Sulzer Papiermasch Gmbh | Device for the lateral sealing of a wedge-shaped gap in a twin-wire paper machine |
DE29615823U1 (en) * | 1996-09-13 | 1996-10-31 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Suction box |
FI116394B (en) * | 2001-05-23 | 2005-11-15 | Metso Paper Inc | Control arrangement for the edge of the cellulose pulp to a web former and a method for checking the edge of the cellulose pulp |
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2007
- 2007-03-28 FI FI20075202A patent/FI120205B/en not_active IP Right Cessation
-
2008
- 2008-03-27 EP EP08397506A patent/EP1975312A1/en not_active Withdrawn
- 2008-03-28 CN CNA200810096387XA patent/CN101285279A/en active Pending
- 2008-03-28 US US12/078,320 patent/US20080236775A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4968387A (en) | 1990-01-23 | 1990-11-06 | Westvaco Corporation | Papermachine deckle means |
FI115473B (en) | 2004-03-25 | 2005-05-13 | Process Flow Ltd Oy | Papermaking and cardboardmaking technique and apparatus for this |
FI116796B (en) | 2005-01-14 | 2006-02-28 | Vaahto Oy | Device in a paper or cardboard machine for limiting the mass flow from the inlet box |
EP1681390A1 (en) * | 2005-01-14 | 2006-07-19 | Vaahto OY | Apparatus in a paper or cardboard machine for confining the pulp flow from the headbox |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202011103266U1 (en) | 2011-07-16 | 2011-08-29 | Voith Patent Gmbh | A forming apparatus |
WO2013010975A1 (en) | 2011-07-16 | 2013-01-24 | Voith Patent Gmbh | Sheet forming device |
WO2013010977A1 (en) | 2011-07-16 | 2013-01-24 | Voith Patent Gmbh | Sheet forming device |
US20140328635A1 (en) * | 2013-05-02 | 2014-11-06 | Mark Regan Baluha | Conveyor product containment device |
US9353479B2 (en) * | 2013-05-02 | 2016-05-31 | Mark Regan Baluha | Conveyor product containment device |
Also Published As
Publication number | Publication date |
---|---|
US20080236775A1 (en) | 2008-10-02 |
FI20075202A0 (en) | 2007-03-28 |
FI120205B (en) | 2009-07-31 |
FI20075202A (en) | 2008-09-29 |
CN101285279A (en) | 2008-10-15 |
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