EP1844192A1 - Vorrichtung und verfahren zum gezielten einstellen der konsistenz eines stofflösungsstroms in einer papiermaschine - Google Patents
Vorrichtung und verfahren zum gezielten einstellen der konsistenz eines stofflösungsstroms in einer papiermaschineInfo
- Publication number
- EP1844192A1 EP1844192A1 EP05709199A EP05709199A EP1844192A1 EP 1844192 A1 EP1844192 A1 EP 1844192A1 EP 05709199 A EP05709199 A EP 05709199A EP 05709199 A EP05709199 A EP 05709199A EP 1844192 A1 EP1844192 A1 EP 1844192A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stock solution
- flow
- channel
- consistency
- primary channel
- 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
- 239000011550 stock solution Substances 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims description 21
- 239000006096 absorbing agent Substances 0.000 claims abstract description 78
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 238000002604 ultrasonography Methods 0.000 claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012895 dilution Substances 0.000 description 5
- 238000010790 dilution Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000006194 liquid suspension Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- D21F1/02—Head boxes of Fourdrinier machines
-
- 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
- D21F1/009—Fibre-rearranging devices
-
- 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
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/026—Details of the turbulence section
-
- 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
- D21F1/08—Regulating consistency
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0027—Paper-making control systems controlling the forming section
Definitions
- the present invention relates to an apparatus for controlling the consistency of a flow of stock solution flowing from a header to a slice lip of a headbox of a papermaking machine. More specifically, the present invention relates to an apparatus and a method for controlling the consistency of a flow of stock solution flowing from a header to a slice lip of a headbox of a papermaking machine so that the cross machine direction profile of a resultant web is controlled. Background information.
- a solution of paper stock is supplied to a headbox of a papermaking machine.
- the pressurized stock is guided through a plurality of headbox flow channels into a slice chamber of the headbox.
- the stock is then ejected as a thin ribbon through a slice lip defined by the downstream end of the headbox.
- the ejected stock is received onto a moving Fourdrinier screen where water drains from the stock solution to provide a formed web.
- One of the more important quality parameters in the paper making process is the evenness of the cross machine direction basis weight profile. Even if the cross machine profile of the concentration of the stock ejected from the headbox slice is fairly even, the final basis weight profile is normally altered due to several defects produced along the process in the machine. These defects include an uneven flow profile of the stock ejected from the headbox, uneven retention of the fibers on the fourdrinier, uneven pick up of solids in the size press or in the coating station. The usual way to control the aforementioned defects is to compensate for them by controlling the consistency profile of the stock before it is ejected from the headbox.
- the headbox is divided into several discrete cross machine sections of a certain width and in each of these sections the consistency of the stock is individually controlled according to the measure of the basis weight of the final sheet in the corresponding cross machine section.
- the present invention provides an apparatus and method for controlling the consistency profile in a headbox and for providing a web having a more uniform cross machine direction basis weight profile.
- Many prior art arrangements have been devised in an attempt to provide a relatively uniform grammage or basis weight in a cross machine direction of the web.
- Early attempts at controlling the aforementioned characteristic of the web included the provision of a plurality of slice lip screw jacks spaced a few inches from each other in a cross machine direction. Such jacks were connected to a movable slice lip of the slice opening. Controlled movement of the jacks would warp the slice lip in such a way that a relatively uniform ribbon of stock would be ejected through the slice opening. Nevertheless, such arrangements were complex.
- a further development included the provision of uniformly spaced slice lips while controlling the consistency or dilution of the stock in a cross machine direction upstream relative to the slice lips. More particularly, immediately upstream from the tube bank, a flow of diluting white water or the like was selectively introduced into one or more of the headbox tubes of the tube bank so that the consistency of the stock flowing through that particular tube would be changed or diluted relative to the consistency of stock flowing through an adjacent tube.
- the present invention provides a unique means for achieving a uniform basis weight or grammage in a cross machine direction by the application of ultrasonic waves for controlling in a cross machine direction, the grammage of the resultant web.
- ultrasonic waves when ultrasonic waves are applied to a liquid suspension, such ultrasonic waves have the capability of moving the suspended particles.
- particles suspended in a stationary suspension and contained within a reservoir are located in between an ultrasound generator and a ultrasound absorber device.
- ultrasonic waves When ultrasonic waves are applied to the particles, such particles are moved by the ultrasound waves in a direction extending from the generator to the absorber.
- the same effect occurs when ultrasonic waves are applied to a moving suspension of particles.
- a flow of the suspension is moving in a generic direction at a generic speed and the suspension flow crosses a region between the ultrasound generator and the absorber, then the suspended particles will be deviated from the flow direction by a motion component which is parallel to the line going from the generator to the absorber.
- the object of the present invention is the application of the aforementioned physical principle to control the concentration of a paper making fibrous material suspension or stock solution through a head box.
- control of fiber suspension concentration or consistency in any specific cross machine section of the headbox is used to control the final paper sheet cross machine grammage profile.
- the effect is applied to a suspension such as paper stock flowing into a channel from left to right.
- Ultrasound waves cross the channel from the top to the bottom. Such waves push suspended particles or fibers toward the bottom side of the channel.
- the channel Downstream from the ultrasonic device, the channel is split into secondary channels, that is a supply channel and a recirculation channel. It is evident that the average concentration of the suspension received by the supply channel is in this case lower than the average concentration of the suspension received by the recirculation channel.
- the difference between the two concentrations is in some way related to the power delivered by the ultrasonic device. In particular, the higher the power, of the generator or the capacity of the absorber, the bigger is the difference in concentration between the supply channel and the recirculation channel.
- the fiber suspension of the stock solution enters the headbox from a supply header and is transferred to a tube bank through a bank of flow channels.
- the adjacent channels forming the flow channels can be either physically separated one from the other by sidewalls or not.
- the principle of two secondary channels is applied to each single flow channel.
- Each flow channel is equipped with its own ultrasonic device.
- each ultrasonic device includes an independent control.
- Each flow channel is split into two secondary channels, one top channel and one bottom channel.
- One of the two secondary channels is a supply channel of a corresponding cross machine direction section of the headbox tube bank.
- the other secondary channel or recirculation channel of each flow channel permits recirculation to the supply system of the headbox.
- a recirculation header collects the flow from each of the recirculation channels of all the flow channels. The stock collected by the recirculation header is simply recirculated into the stock approach system with no need for any extra equipment.
- the present invention relates to an apparatus for controlling the cross machine consistency profile of a flow of stock solution flowing from a header to a slice lip of a headbox of a papermaking machine so that the cross machine direction consistency profile of a resultant web is controlled.
- the apparatus includes a flow channel which is disposed within the headbox between the header and the slice lip.
- the flow channel has an upstream and a downstream end such that the flow of the stock solution is in a flow direction from the upstream end towards the downstream end of the flow channel.
- the flow channel includes a primary channel having a first and a second extremity such that the flow of the stock solution is through the primary channel from the first extremity to the second extremity of the primary channel.
- a supply channel has a first and a second end and is disposed downstream relative to the primary channel for the flow therethrough of a supply portion of the flow of the stock solution.
- the second end of the supply channel is connected to the slice Hp so that the supply portion of the flow of the stock solution flows to the slice lip.
- a recirculation channel has a first and a second termination, the recirculation channel being disposed downstream relative to the primary channel for the flow therethrough of a recirculation portion of the flow of the stock solution.
- the second termination of the recirculation channel is connected to the header so that the recirculation portion of the flow of the stock solution flows to the header.
- a generator is disposed adjacent to the primary channel for generating ultrasonic waves within the flow of the stock solution flowing through the primary channel.
- the ultrasonic waves move fiber particles suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel.
- an ultrasound absorber is disposed adjacent to the primary channel such that the flow of the stock solution flows in the flow direction within a region disposed between the generator and the absorber so that in operation of the apparatus, when the stock solution is flowing within the region, the fiber particles suspended within the stock solution are deviated from the flow direction.
- the arrangement is such that the consistency of the stock solution flowing from the primary channel through the supply channel is different from the consistency of the stock solution flowing from the primary channel through the recirculation channel so that the consistency of the supply portion of the stock solution flowing through the slice lip is controlled thereby controlling the cross machine direction profile of the resultant web.
- the apparatus includes a further generator which is disposed adjacent to the primary channel and laterally relative to the generator for generating ultrasonic waves within the flow of the stock solution flowing through the primary channel.
- the ultrasonic waves move fiber particles suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel.
- a further ultrasound absorber is disposed adjacent to the primary channel and laterally relative o the absorber such that the flow of the stock solution flows in the flow direction within a further region disposed between the further generator and the further absorber such that in operation of the apparatus, when the stock solution is flowing within the further region, the fiber particles suspended within the stock solution are deviated from the flow direction so that the consistency of the stock solution flowing from the primary channel downstream from the further region through the supply channel is different from the consistency of the stock solution flowing from the primary channel downstream from the further region through the recirculation channel.
- the arrangement is such that the consistency of a further supply portion of the stock solution flowing through the slice lip downstream from the further region is controlled relative to the supply portion of the stock solution flowing downstream from the region through the slice lip thereby controlling the cross machine direction consistency profile of the resultant web.
- the flow direction is approximately parallel to a direction from the header to the slice lip.
- the primary channel defines a primary conduit of rectangular cross sectional configuration, the primary conduit extending from the first extremity to the second extremity of the primary channel.
- the first end of the supply channel extends from the second extremity of the primary channel and the supply channel is disposed above the recirculation channel.
- the supply channel is disposed below the recirculation channel.
- the first termination of the recirculation channel extends from the second extremity of the primary channel such that the flow of the stock solution flowing through the primary channel is split into the supply portion and the recirculation portion adjacent to the second extremity of the primary channel.
- the apparatus further includes a control device which is electrically connected to the generator for controllably altering the generation of the ultrasonic waves by the generator.
- a device is mechanically connected to the generator for controllably altering a location of the generator relative to the primary channel so that generation of the ultrasonic waves within the region by the generator is altered.
- a controller is electrically connected to the ultrasound absorber for controllably altering absorption of the ultrasonic waves by the absorber.
- a control device is mechanically connected to the absorber for controllably altering a disposition of the absorber relative to the primary channel so that absorption of the ultrasonic waves by the absorber is altered.
- the flow direction within the region is disposed non parallel to a direction from the generator to the absorber.
- the flow direction within the region is disposed substantially normal to a direction from the generator to the absorber.
- the direction from the generator to the absorber is substantially normal to the flow direction within the region such that in use of the apparatus, the ultrasonic waves deviate movement of the fiber particles in a component direction which is disposed angularly between the flow direction and the direction from the generator to the absorber.
- the present invention also includes a method for controlling the consistency of a flow of stock solution flowing from a header to a slice lip of a headbox of a papermaking machine so that the cross machine direction consistency profile of a resultant web is controlled.
- the method includes the steps of guiding the flow of the stock solution through a flow channel which is disposed within the headbox between the header and the slice lip.
- the flow channel includes a primary channel which has a first and a second extremity.
- a supply channel has a first and a second end, the supply channel being disposed downstream relative to the primary channel for the flow therethrough of a supply portion of the flow of the stock solution.
- the second end of the supply channel is connected to the slice lip so that the supply portion of the flow of the stock solution flows to the slice lip.
- a recirculation channel has a first and a second termination, the recirculation channel being disposed downstream relative to the primary channel for the flow therethrough of a recirculation portion of the flow of the stock solution.
- the second termination of the recirculation channel is connected to the header so that the recirculation portion of the flow of the stock solution flows to the header.
- the method also includes the steps of generating ultrasonic waves within the flow of the stock solution flowing through the primary channel by an ultrasonic generator.
- the ultrasonic waves move fiber particles suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel.
- the method includes absorbing the ultrasonic waves by an ultrasound absorber disposed adjacent to the primary channel such that the flow of the stock solution flows in the flow direction within a region which is disposed between the generator and the absorber.
- the arrangement is such that when the stock solution is flowing within the region, the fiber particles suspended within the stock solution are deviated from the flow direction so that the consistency of the stock solution flowing from the primary channel through the supply channel is different from the consistency of the stock solution flowing from the primary channel through the recirculation channel.
- the method is such that that the consistency of the supply portion of the stock solution flowing through the slice lip is controlled thereby controlling the cross machine direction consistency profile of the resultant web.
- Fig. 1 is a schematic to demonstrate the effect of the application of ultrasonic waves on a stock solution according to the present invention
- Fig. 2 is a similar view to that shown in Fig. 1 but shows the generator energized
- Fig. 3 is a similar view to that shown in Fig. 2 but shows the fiber suspension or stock solution in motion
- Fig. 4 is a diagrammatic representation of an apparatus according to the present invention for controlling the consistency of stock solution within a headbox of a papermaking machine
- Fig. 5 a side elevational view of an apparatus for controlling the consistency of a flow of stock solution flowing from a header to a slice lip of a headbox of a papermaking machine;
- Fig. 6 is a sectional view taken on the line 6-6 of Fig. 5;
- Fig 7 is a similar view to that shown in Fig. 6 but shows another embodiment of the present invention;
- Fig. 8 is a sectional view taken on the line 8-8 of Fig. 7;
- Fig. 9 is a side elevational view of another embodiment of the present invention.
- Fig. 10 is a similar view to that shown in Fig. 6 but shows a further embodiment of the present invention.
- Fig. 1 1 is a similar view to that shown in Fig. 10 but shows a further embodiment of the present invention
- Fig.12 is a similar view to that shown in Fig. 10 but shows another embodiment of the present invention
- Fig. 13 is a similar view to that shown in Fig. 1 1 but shows a further embodiment of the present invention.
- Fig. 1 is a schematic to demonstrate the effect of the application of ultrasonic waves on a stock solution according to the present invention.
- a generator 10 is disposed adjacent to a first side of a container 16 and an absorber 24 is disposed on the opposite side of the container 16.
- the container 16 is filled with a suspension of fiber particles 18, 19 and 20 randomly dispersed throughout the host liquid such as water.
- Fig. 2 is a similar view to that shown in Fig. 1.
- the generator 10 is energized so that the generator 10 emits ultrasonic waves 12, 13 and 14 through the container 16 containing the fiber particles 18, 19 and 20 suspended in water. Accordingly, the ultrasonic waves 12-14 cause the particles 18-20 to move through the water in a direction as indicated by the arrow 22 from the generator 10 towards the absorber 24.
- Fig. 3 is a similar view to that shown in Fig. 2 but shows the fiber suspension or stock solution in motion.
- the stock solution which includes the fibers 18-20 is moving through the container 16 in a flow direction as indicated by the arrow 26.
- the flow direction 26 is normal to the direction 22.
- the fiber particles 18-20 will move in a component direction which is indicated by the arrow 28.
- the component direction 28 is disposed angularly between the directions 22 and 26. Consequently, in a downstream location relative to the generator 10, the suspension or stock solution will be more concentrated or will have a higher consistency on the side 30 of the container 16 nearest to the absorber 24. Similarly, the stock solution will be diluted or will be of a lower consistency on a further side 32 of the container 16 nearest to the generator 10 as shown in Fig. 3.
- Fig. 4 is a diagrammatic representation of an apparatus according to the present invention for controlling the consistency of the stock solution 34 which includes the fibers 18-20, within a headbox generally designated 36 of a papermaking machine.
- a headbox generally designated 36 of a papermaking machine.
- the generator 10 when the generator 10 is activated, ultrasonic waves 12-14 are emitted through the stock solution 34 flowing in the flow direction 26 through the headbox 36.
- the ultrasonic waves 12-14 move in the direction 22 from the generator 10 across the flow direction 26 of the stock solution 34 towards the absorber 24. Consequently, the consistency or concentration of the fibers within the stock solution 34 is greater on the side 30 of the headbox 36 which is nearest to the absorber 24.
- Such concentrated stock is diverted through a downstream recirculation channel 38.
- the stock solution 34 is diluted because many of the fibers 18-20 have migrated towards the side 30 under the influence of the applied ultrasonic waves 12-14. Such diluted stock is guided through a downstream supply channel 40.
- Fig. 5 a side elevational view of an apparatus generally designated 42 according to the present invention for controlling the consistency of a flow of stock solution flowing from a header 44 to a slice lip 46 of a headbox generally designated 36 of a papermaking machine so that the cross machine direction consistency profile of a resultant web is controlled.
- the apparatus 42 includes a flow channel generally designated 48 which is disposed within the headbox 36 between the header 44 and the slice lip 46.
- the flow channel 48 has an upstream and a downstream end 50 and 52 respectively such that the flow of the stock solution is in a flow direction 26 from the upstream end 50 towards the downstream end 52 of the flow channel 48.
- the flow channel 48 includes a primary channel 56 having a first and a second extremity 58 and 60 respectively such that the flow of the stock solution is through the primary channel 56 from the first extremity 58 to the second extremity 60 of the primary channel 56.
- a supply channel 40 has a first and a second end 64 and 66 respectively and is disposed downstream relative to the primary channel 56 for the flow therethrough of a supply portion as indicated by the arrow 68 of the flow of the stock solution.
- the second end 66 of the supply channel 40 is connected to the slice lip 46 so that the supply portion 68 of the flow of the stock solution flows to the slice lip 46.
- a recirculation channel 38 has a first and a second termination 72 and 74 respectively, the recirculation channel 38 being disposed downstream relative to the primary channel 56 for the flow therethrough of a recirculation portion as indicated by the arrow 76 of the flow of the stock solution.
- the second termination 74 of the recirculation channel 38 is connected to the header 44 so that the recirculation portion 76 of the flow of the stock solution flows to the header 44.
- a generator 10 is disposed adjacent to the primary channel 56 for generating ultrasonic waves 12-14 within the flow of the stock solution flowing through the primary channel 56.
- the ultrasonic waves 12-14 move fiber particles 18-20 suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel 56.
- an ultrasound absorber 24 is disposed adjacent to the primary channel 56 such that the flow of the stock solution flows in the flow direction 26 within a region R disposed between the generator 10 and the absorber 24 so that in operation of the apparatus 42, when the stock solution is flowing within the region R, the fiber particles 18-20 suspended within the stock solution are deviated as indicated by the arrow 28 from the flow direction 26.
- the arrangement is such that the consistency of the stock solution flowing from the primary channel 56 through the supply channel 40 is different from the consistency of the stock solution flowing from the primary channel 56 through the recirculation channel 38 so that the consistency of the supply portion 68 of the stock solution flowing through the slice lip 46 is controlled thereby controlling the cross machine direction consistency profile of the resultant web.
- Fig. 6 is a sectional view taken on the line 6-6 of Fig. 5. As shown in Fig. 6, the flow channel 48 extends across most of the cross machine width of the headbox 36. Also, the supply channel 40 is shown leading to the slice lip. Furthermore, the recirculation channel 38 is shown for returning concentrated stock solution to the header.
- Fig 7 is a similar view to that shown in Fig. 6 but shows another embodiment of the present invention.
- an apparatus 42a includes a further generator
- the ultrasonic waves move fiber particles suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel 56.
- Fig. 8 is a sectional view taken on the line 8-8 of Fig. 7.
- a further ultrasound absorber 86 is disposed adjacent to the primary channel 56 such that the flow of the stock solution flows in the flow direction 26 within a further region r disposed between the further generator 84 and the further absorber 86.
- the arrangements is structured such that in operation of the apparatus 42a, when the stock solution is flowing within the further region r, the fiber particles suspended within the stock solution are deviated from the flow direction 26 so that the consistency of the stock solution flowing from the primary channel 56 through the supply channel 62 downstream from the region r is different from the consistency of the stock solution flowing from the primary channel 56 downstream from the region r through the recirculation channel 38.
- the arrangement is such that the consistency of a further supply portion 88 of the stock solution flowing downstream from the region r through the slice lip 46 is controlled relative to the supply portion 68 of the stock solution as shown in Fig. 5, flowing downstream from the region R through the slice lip 46 thereby controlling the cross machine direction consistency profile of the resultant web.
- the flow direction 26 is approximately parallel to a direction as indicated by the arrow 116 from the header 44 to the slice lip 46.
- the primary channel 56 defines a primary conduit 1 18 of rectangular cross sectional configuration. As shown in Fig. 6, the primary conduit 1 18 extends from the first extremity 58 to the second extremity 60 of the primary channel 56.
- the first end of the supply channel 40 extends from the second extremity 60 of the primary channel 56 and the supply channel
- Fig. 9 is a side elevational view of another embodiment of the present invention.
- the supply channel 40b is disposed below the recirculation channel 38b.
- the first termination 72 of the recirculation channel 38 extends from the second extremity 60 of the primary channel 56 such that the flow of the stock solution flowing through the primary channel 56 is split into the supply portion 68 and the recirculation portion 76 adjacent to the second extremity 60 of the primary channel 56.
- Fig. 10 is a similar view to that shown in Fig. 6 but shows a further embodiment of the present invention.
- the apparatus further includes a control device 120 which is electrically connected to the generator 10c for controllably altering the generation of the ultrasonic waves by the generator 10c.
- Fig. 11 is a similar view to that shown in Fig. 10 but shows a further embodiment of the present invention.
- a device 122 such as a hydraulic or a pneumatic ram is mechanically connected to the generator 1Od for controllably altering a location of the generator 1Od relative to the primary channel 56 as indicated by the arrow 123 so that generation of the ultrasonic waves within the region R by the generator 1Od is altered.
- Fig. 12 is a similar view to that shown in Fig. 10 but shows a further embodiment of the present invention.
- a controller 124 is electrically connected to the ultrasound absorber 24e for controllably altering absorption of the ultrasonic waves by the absorber 24e.
- Fig. 13 is a similar view to that shown in Fig. 1 1 but shows a further embodiment of the present invention.
- a control device 126 such as a hydraulic or pneumatic ram is mechanically connected to the absorber 24f for controllably altering a disposition of the absorber 24f relative to the primary channel 56 as indicated by the arrow 127 so that absorption of the ultrasonic waves by the absorber 24f is altered.
- the flow direction 26 within the region R and r is disposed non parallel to a direction 22 from the generator 10 to the absorber 24.
- the flow direction 26 within the region R is disposed substantially normal to the direction 22 from the generator 10 to the absorber 24.
- the direction 22 from the generator 10 to the absorber 24 is substantially normal to the flow direction 26 within the region R such that in use of the apparatus, the ultrasonic waves deviate movement of the fiber particles in a component direction 28 shown in Fig. 5 which is disposed angularly between the flow direction 26 and the direction 22 from the generator 10 to the absorber 24.
- the present invention also includes a method for controlling the cross machine consistency profile of a flow of stock solution flowing from a header 44 to a slice lip 46 of a headbox 36 of a papermaking machine so that the cross machine direction profile of a resultant web is controlled.
- the method includes the steps of guiding the flow of the stock solution through a flow channel 48 which is disposed within the headbox 36 between the header 44 and the slice lip 46.
- the flow channel 48 includes a primary channel 56 which has a first and a second extremity 58 and 60.
- a supply channel 40 has a first and a second end 64 and 66, the supply channel 40 being disposed downstream relative to the primary channel 56 for the flow therethrough of a supply portion 68 of the flow of the stock solution.
- the second end 66 of the supply channel 40 is connected to the slice lip 46 so that the supply portion 68 of the flow of the stock solution flows to the slice lip 46.
- a recirculation channel 38 has a first and a second termination 72 and 74, the recirculation channel 38 being disposed downstream relative to the primary channel 56 for the flow therethrough of a recirculation portion 76 of the flow of the stock solution.
- the second termination 74 of the recirculation channel 38 is connected to the header 44 so that the recirculation portion 76 of the flow of the stock solution flows to the header 44.
- the method also includes the steps of generating ultrasonic waves within the flow of the stock solution flowing through the primary channel 56 by an ultrasonic generator 10.
- the ultrasonic waves move fiber particles suspended within the stock solution for controlling the consistency of the stock solution flowing through the primary channel 56.
- the method includes absorbing the ultrasonic waves by an ultrasound absorber 24 disposed adjacent to the primary channel 56 such that the flow of the stock solution flows in the flow direction 26 within a region R which is disposed between the generator 10 and the absorber 24.
- the arrangement is such that when the stock solution is flowing within the region R, the fiber particles suspended within the stock solution are deviated from the flow direction 26 so that the consistency of the stock solution flowing from the primary channel 56 through the supply channel 40 is different from the consistency of the stock solution flowing from the primary channel 56 through the recirculation channel 38.
- the method is such that that the consistency of the supply portion 68 of the stock solution flowing through the slice lip 46 is controlled thereby controlling the cross machine direction consistency profile of the resultant web.
- a stock solution is supplied to the header under pressure.
- the stock flows through the flow channel 48 so that when the generator and absorber 10 and 24 respectively are activated, diluted stock flows from the region R through the downstream supply channel 40 to the slice lip 46.
- the further generator and further absorber 84 and 86 respectively act upon the region r which is disposed laterally relative to the region R as shown in Fig. 7. Consequently, the dilution of the stock flowing downstream from the region r through the supply channel 40 can be controlled or altered relative to the dilution of the laterally disposed flow of stock flowing downstream from the region R.
- the cross machine directional consistency profile of the resultant web can be controlled.
- control can be achieved as shown in Figs. 10-13 by either controlling the electrical supply to the generator or to the absorber or by mechanically moving the disposition of the generator or the absorber or both the generator and the absorber relative to the primary channel 56.
- the generation capacity of the generator can be changed by increasing or decreasing the electrical input or by moving the generator towards or away from the primary channel.
- the absorption factor of the absorber can be changed by increasing or decreasing the electrical input to the absorber or by moving the absorber towards or away from the primary channel. Any combination of the above can be used for controlling the ultrasonic waves within the primary channel.
- One of the advantages of the arrangement according to the present invention when using an electrical control for the generator and/or absorber is that the consistency control is accomplished by entirely an electrical device rather than a mechanical device in the case of slice lip control.
- the present invention describes the recirculation portion of the stock as returning to the header, it will be apparent to those skilled in the art that in fact, the recirculation portion will usually be returned to the header via the stock supply silo.
- the present invention provides a unique apparatus and method for controlling the cross machine direction profile of a web.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PL05709199T PL1844192T3 (pl) | 2005-02-03 | 2005-02-03 | Aparatura oraz metoda kontroli konsystencji przepływu roztworu podstawowego w maszynie papierniczej |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2005/000049 WO2006082600A1 (en) | 2005-02-03 | 2005-02-03 | Apparatus and method for controlling the consistency of a flow of stock solution in a papermaking machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1844192A1 true EP1844192A1 (de) | 2007-10-17 |
EP1844192B1 EP1844192B1 (de) | 2011-04-06 |
Family
ID=34960444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05709199A Not-in-force EP1844192B1 (de) | 2005-02-03 | 2005-02-03 | Vorrichtung und verfahren zur regelung der konsistenz eines stoffsuspensionsstroms in einer papiermaschine |
Country Status (13)
Country | Link |
---|---|
US (1) | US20080135198A1 (de) |
EP (1) | EP1844192B1 (de) |
CN (1) | CN101087917B (de) |
AT (1) | ATE504693T1 (de) |
AU (1) | AU2005326567B2 (de) |
BR (1) | BRPI0519932A2 (de) |
CA (1) | CA2581228C (de) |
CZ (1) | CZ2007514A3 (de) |
DE (1) | DE602005027403D1 (de) |
ES (1) | ES2364485T3 (de) |
HU (1) | HUP0700557A2 (de) |
PL (1) | PL1844192T3 (de) |
WO (1) | WO2006082600A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102154914B (zh) * | 2011-02-24 | 2013-03-20 | 钟洲 | 制备芳纶纸的方法及由该方法获得的芳纶纸 |
CN114457609B (zh) * | 2022-01-18 | 2024-02-27 | 中国科学院山西煤炭化学研究所 | 一种特种纤维用流浆箱体及利用其分散纤维的方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4234940C2 (de) * | 1992-10-16 | 1994-04-07 | Voith Gmbh J M | Stoffauflauf mit Flächengewichts-Querprofilregelung durch lokale Konzentrationsänderung |
US5803270A (en) * | 1995-10-31 | 1998-09-08 | Institute Of Paper Science & Technology, Inc. | Methods and apparatus for acoustic fiber fractionation |
DE19634996C2 (de) * | 1996-08-30 | 2000-05-25 | Voith Sulzer Papiermasch Gmbh | Stoffdichtegeregelter Stoffauflauf mit Papierstoffkonsistenzregelung |
DE19634993A1 (de) * | 1996-08-30 | 1998-03-05 | Voith Sulzer Papiermasch Gmbh | Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf |
FI113284B (fi) * | 1998-02-13 | 2004-03-31 | Metso Paper Inc | Paperikoneen/kartonkikoneen perälaatikko, jolla rainan neliöpaino on säädettävissä |
EP1556544A2 (de) * | 2002-11-01 | 2005-07-27 | International Paper Company | Verfahren zur herstellung von mehrschichtigem papier |
-
2005
- 2005-02-03 HU HU0700557A patent/HUP0700557A2/hu active IP Right Revival
- 2005-02-03 WO PCT/IT2005/000049 patent/WO2006082600A1/en active Application Filing
- 2005-02-03 AU AU2005326567A patent/AU2005326567B2/en not_active Ceased
- 2005-02-03 BR BRPI0519932-8A patent/BRPI0519932A2/pt not_active IP Right Cessation
- 2005-02-03 AT AT05709199T patent/ATE504693T1/de active
- 2005-02-03 US US11/883,699 patent/US20080135198A1/en not_active Abandoned
- 2005-02-03 EP EP05709199A patent/EP1844192B1/de not_active Not-in-force
- 2005-02-03 ES ES05709199T patent/ES2364485T3/es active Active
- 2005-02-03 CZ CZ20070514A patent/CZ2007514A3/cs unknown
- 2005-02-03 PL PL05709199T patent/PL1844192T3/pl unknown
- 2005-02-03 DE DE602005027403T patent/DE602005027403D1/de active Active
- 2005-02-03 CA CA2581228A patent/CA2581228C/en not_active Expired - Fee Related
- 2005-02-03 CN CN2005800348837A patent/CN101087917B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO2006082600A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE504693T1 (de) | 2011-04-15 |
WO2006082600A1 (en) | 2006-08-10 |
ES2364485T3 (es) | 2011-09-05 |
DE602005027403D1 (de) | 2011-05-19 |
CA2581228A1 (en) | 2006-08-10 |
US20080135198A1 (en) | 2008-06-12 |
AU2005326567B2 (en) | 2010-12-09 |
HUP0700557A2 (en) | 2008-02-28 |
AU2005326567A1 (en) | 2006-08-10 |
EP1844192B1 (de) | 2011-04-06 |
CZ2007514A3 (cs) | 2008-02-27 |
BRPI0519932A2 (pt) | 2009-04-07 |
CN101087917A (zh) | 2007-12-12 |
CN101087917B (zh) | 2011-12-14 |
PL1844192T3 (pl) | 2011-09-30 |
CA2581228C (en) | 2010-04-27 |
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