CA2078574C - Device for cleaning a revolving paper machine wire - Google Patents
Device for cleaning a revolving paper machine wireInfo
- Publication number
- CA2078574C CA2078574C CA002078574A CA2078574A CA2078574C CA 2078574 C CA2078574 C CA 2078574C CA 002078574 A CA002078574 A CA 002078574A CA 2078574 A CA2078574 A CA 2078574A CA 2078574 C CA2078574 C CA 2078574C
- Authority
- CA
- Canada
- Prior art keywords
- wire
- wire web
- elongated
- cleaning device
- web
- 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.)
- Expired - Fee Related
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000007921 spray Substances 0.000 claims abstract description 48
- 238000013459 approach Methods 0.000 claims abstract description 32
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims description 8
- 239000002657 fibrous material Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 5
- 239000000306 component Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 101100238304 Mus musculus Morc1 gene Proteins 0.000 description 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012360 testing method Methods 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
- D21F1/32—Washing wire-cloths or felts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G45/00—Lubricating, cleaning, or clearing devices
- B65G45/10—Cleaning devices
- B65G45/22—Cleaning devices comprising fluid applying means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
Device for Cleaning a Revolving Paper Machine Wire Abstract The device has two mutually parallel slats extending crosswise to the running direction of the wire , namely an approach slat ant a departure slat which with a wire guide surface each touch the revolving wire . Contained between the two slats is a blowing slot connected to a compressed air supply. Forming between the approach slat and the wire is a wedge-shaped gore tapering in the wire running direction, into which gore empties a water spray system.
The departure slat has a step type clearance at the point where the wire leaves the wire guide surface.
The departure slat has a step type clearance at the point where the wire leaves the wire guide surface.
Description
CA 02078~74 1997-10-20 ~evice for C1~An~n~ a Revolv~np Pa~er M~hine Uire The invention concerns a tevica for cleaning a revolving paper 9~hine wire Such or similar devices have becom- known from US-PS 3,265,559. They were successful specifically in the cleaning of felts.
In selecting a cleaning system, various aspects need to be observet.
Uhat matters first of all is the cleaning effect itself, which must be simultaneous and uniform across the entirc rsrhin~ width. Besides, however, also th- energy consumption plays an important role. Further-more, attention must be pait to low wear of the participating compo-nents. Lastly, also waste water problems need to be avoided.
In wire cleaning, water ~ets have so far been employed primarily; these are thrown at high pressure from spray nozzles at the wire to be cleaned. ~hile the cleaning effect is very good, it is striped though, at the spacing of the spray nozzles. The expense is rather high, espe-cially the energy demand.
CA 02078~74 1997-10-20 Other problems join in, for in~t~nre the waste water problem.
The problem underlying the invention is to design a device in a way such that the cleaning effect will be improved and that also all other problems, associated with the air nozzles, will be solved in satisfactory fashion.
According to the present invention there is provided a device for cleaning a wire web, the wire web supporting a fiber material web and defining a running direction, said device comprising: two elongated members disposed parallel to each other and ext~n-ling cross-wise to the running direction of the wire web, said two elongated m~rnbers comprising an elongated approach member and an elongated d~p~l~ue member, said elongated approach member and said elongated departure member each having a wire guide surface cont~cting the wire web; a blowing slot disposed between said elongated approach member and said elongated dep~lure member, said blowing slot adapted to be connPcted to an air supply; a wedge-shaped space defined by and between said elongated approach member and the wire web, said wedge-shaped space tapering in the running direction of the wire web; and a water spray system, said water spray system all~rted to spray water into said wedge-shaped space.
The inventional introduction of water into the wedge-shaped gore between the approach slat and the wire causes the wire - although only rather slightly - to lift off the approach slat. At the same tirne, a water film forms on the inside of the wire, of the sprayed water, which water film more or less covers this inside and, thus, also blocks the wire meshes.
Thus, there are no longer any free wire meshes, but the air discharging from the blow nozzle impinges on a practically continuous wall of water.
Contrary to the prior embodiment - blowing air through the wire - the air jet thus can no longer choose the path of least resistance through open wire meshes. It must penetrate the entire wall of water. In the process, it entrains of n.oces~ also the dirt particles clinging to the wire, which are embedded in the water and deposited on the mesh wires. At any rate, tests have shown that the share of entrained dirt particles increases abruptly if according to the invention water is introduced only in the wedge-shaped gap between wire and approach slat.
The screen is simultaneously cleaned across the entire width.
In several applications, various additional requirements are imposed on the wire cleaning system, which are cited hereafter:
1. To be avoided is the deposition of dirt on the system in continu-ous operation, which impairs its effectiveness.
In selecting a cleaning system, various aspects need to be observet.
Uhat matters first of all is the cleaning effect itself, which must be simultaneous and uniform across the entirc rsrhin~ width. Besides, however, also th- energy consumption plays an important role. Further-more, attention must be pait to low wear of the participating compo-nents. Lastly, also waste water problems need to be avoided.
In wire cleaning, water ~ets have so far been employed primarily; these are thrown at high pressure from spray nozzles at the wire to be cleaned. ~hile the cleaning effect is very good, it is striped though, at the spacing of the spray nozzles. The expense is rather high, espe-cially the energy demand.
CA 02078~74 1997-10-20 Other problems join in, for in~t~nre the waste water problem.
The problem underlying the invention is to design a device in a way such that the cleaning effect will be improved and that also all other problems, associated with the air nozzles, will be solved in satisfactory fashion.
According to the present invention there is provided a device for cleaning a wire web, the wire web supporting a fiber material web and defining a running direction, said device comprising: two elongated members disposed parallel to each other and ext~n-ling cross-wise to the running direction of the wire web, said two elongated m~rnbers comprising an elongated approach member and an elongated d~p~l~ue member, said elongated approach member and said elongated departure member each having a wire guide surface cont~cting the wire web; a blowing slot disposed between said elongated approach member and said elongated dep~lure member, said blowing slot adapted to be connPcted to an air supply; a wedge-shaped space defined by and between said elongated approach member and the wire web, said wedge-shaped space tapering in the running direction of the wire web; and a water spray system, said water spray system all~rted to spray water into said wedge-shaped space.
The inventional introduction of water into the wedge-shaped gore between the approach slat and the wire causes the wire - although only rather slightly - to lift off the approach slat. At the same tirne, a water film forms on the inside of the wire, of the sprayed water, which water film more or less covers this inside and, thus, also blocks the wire meshes.
Thus, there are no longer any free wire meshes, but the air discharging from the blow nozzle impinges on a practically continuous wall of water.
Contrary to the prior embodiment - blowing air through the wire - the air jet thus can no longer choose the path of least resistance through open wire meshes. It must penetrate the entire wall of water. In the process, it entrains of n.oces~ also the dirt particles clinging to the wire, which are embedded in the water and deposited on the mesh wires. At any rate, tests have shown that the share of entrained dirt particles increases abruptly if according to the invention water is introduced only in the wedge-shaped gap between wire and approach slat.
The screen is simultaneously cleaned across the entire width.
In several applications, various additional requirements are imposed on the wire cleaning system, which are cited hereafter:
1. To be avoided is the deposition of dirt on the system in continu-ous operation, which impairs its effectiveness.
2. In order to save energy, a ~lIy low water pressure should suffice for the water spray system while nevertheless achieving a ' ~lly uniform spray water distribution across the wire width.
3. It should be possible to adapt the system to various wire running speeds, thus keeping the cleaning effect equally high at different wire N nning screens.
4. The system should be usable also where the web formed is in normal operation lifted of~ the wire (for instance by means of a pick-up suction roll) and where during the start-up phase the web must be passed from the wire to a scrap dissolution system.
Th- i~vention will b- morc fully explain-t with tho aid of the trawing, which in detail~ shows in ~ig 1 through 4, schematic illustrations of variow wire sections for for paper ~rhin~;
Fig 5, scaled up, th- actual system according to the invention, with high-pressure blow nozzle and a water spray system;
Fig 6, schematically, part of a paper ~ n- wire section with a wire cleaning systs2;
Fig 7, a partial view of th- wire cleaning systcm in the direction of arrow II in Fig 6;
Fig 8, scal-d up and motifiet as compar-d to Fig 6, a partial cross section of the wir- cleaning system The wire section illustrated in Fig 1 features a wire 1 wrapping around a number of rolls and mo~ing in th- dir-ction of the arrow The actual cleaning de~ic- comprisas espacially the high-pressure blow nozzle 2 and a spray pipe 3 for application of water ~-ts Further cleaning organs are arranget aheat, for instanc- another spray pip- 4, which shoots water ~ets through tha wire 1 The water ~etQ are collectet in a suction hood 5 2078~7~
Coordinated with the actual, inventional cleaning system 2, 3 is a suction system 6 with a lateral vacuum connection.
In the system according to Fig. 2, blow nozzle 2 and spray pipe 3 - in this case a flat jet spray pipe ~ are again the ma~or c. ,ol~ents of the cleaning system. These two components are arranged on the inside of the wire, i.e., inside the loop formed of the wire 1. Provided on tha out-side is a hood 5 which features a water drain 10 and is hooked to a suc-tion pipe 11. Preceding the flat jet spray pipe 3 is a needle jet spray pipe 4. While this is helpful, it is not decisive though. The embodi-ments according to Fig. 3 and 4 represent modifications. Essential here are also high-pressure blow nozzle 2 with preceding spray pipe 3. The suction hoods 5 serve at the same time to collect the splash water and to provide suction. They feature appropriate connections, the same as the embodiment according to Fig. 2.
Fig. 5 depicts very exactly the structure of the high-pressure blow nozzle. It comprises an approach slat 20, a departure slat 21 and a pressure tube 22. Forming an assembly, these three said components extend across the entire -~h~n~ width, so that the wire 1 is cleaned across its entirs width. Approach slat 20 and departure slat 21 form a blowing slot 23, which without interruption can extend across the wire width. But it may also be interrupted. It may be replaced, e.g., by a number of bores, which as well extend across the entire wire width.
207~74 Decisive is the shape of the approach slat 20 and the routing of the wire 1. As can be seen, these two form an angle ~ with each other. In the present case, the angle ~ amounts to about 30~. The wedge-shaped bore 24 forming between these two tapers thus in the wire running direc-tion.
Preceding the gore 24 is a spray pipe 30 arranged in such a way that it supplies directly or indirectly spray jets 31 of water to the gore 24.
The supply may occur at a more or less high pressure.
The two slats 20 and 21 are made, at least on their surface touched by the wire, of wear-resistant material, for instance ceramic.
The wire runs on the approach slat 20, which at this point has a radius of about 10 to 50 mm. Due to its reversal, the wire is already dewatered at this radius, due to eccentric force.
The blowing slot 23 has a width of 1 to 10 mm.
The departure slo~ 21 forms in the departure area as well a radius. It ensures that the wire will not be lifted off this slat by the air pres-sure, so that the blowing air cannot escape. The radius required on the departure slat 21 depends on operating parameters such as air pressure, wire permeability, wire tension and others. The radius is so selected that the r~ining contact pressure of the wire on the reversal surface 2~7~74 of ehe departure slat 21 will be min~ -1 keeping the slat wear and wire wear as well in; ~1 The design of the control is such that the air will be turned off imme-diately in case of water failure and that the blowing nozzle will swing out of the wire - with a slight time delay~
Fig. 6 depicts a ~continuous revolving wire 1 which in known fashion runs across a wire suction roll 35 and from there across a wire cleaning system 40 and to a wire guide roll 36. The paper web appro~ching on the wire 1 (and still wet) is in normal operation picked off the wire and passed to the successive (not illustrated) press section, with the aid of a continuous felt 38 and a pick-up suction roll 37. During the start-up phase or upon operational bréakdown, the pick-up suction roll 37 is with the aid of hydraulic cylinders 39 lifted off the wire 1 in known fashion (as illustrated by dash dot lines). In this state of operation, the web runs with the wire 1 up to the wire cleaning system 40, is separated by it from the wire and runs then approximately along the broken line S downwart into a not illustrated scrap dissolution system.
As can be seen best from Fig. 8, the wire cleaning system 40 has an approach slat 41 and a departure slat 42, each touching the revolving wire 1 with a wire guide surface. The width of the wire guide surface of the approach slot 41 is marked a, the width of the wire guide surface of the departure slat is marked b. The two wire guide surfaces are approxi-2~78~7'1 mately eq~ally wide, while the overall width A of the approach slat isnearly twice as large as the overall width B of the departure slat. The wire guide surfaces may be pred~ nAntly flat (with rounded edges) or have a slightly convex curvature. The slats 41 and 42 are fastened to the support body 43 in such a way that an air blowing slot 44 L.- -~nQ
between the two slats. The support body is fashioned as a hollow body serving to supply blowing air. Forming between the approach slat 41 find the wire l is a wedge-shaped gore 45 (with angle w) tapering in the wire running direction. A water spray system 46 sprays water jets across the entire wire width into the gore 45.
At the point where the wire l leaves the wire guide surface, the depar-ture slat 42 features a stepped clearance 47; the latter forms with the wire guide surface a relatively sharp teparture edge, which the wire must touch. This configuration achieves that the surfaces of the depar-ture slat 42 which are not in contact with the wire tend less than here-tofore to A~ te dirt that might impair the proper functioning of the wire cleaning system 40.
Due to the larger overall width A of the approach slat 41, the wedse-shaped gore 45 (in the direction of wire travel) is longer than hereto-fore. This gives rise to the possibility, more so than heretofore, that the wire l accelerates the water jets coming from the water spray system 46. Thus, the pressure of the supplied water can be reduced as compared to formerly, thus saving energy. To allow the adjustment of optimum . ' 207~7~
conditions in this respect, the angle w between wire 1 and approach slat 41 is suitably changed, specifically to thereby adapt it to the wire travel speed. The support body 43 is for that purpose pivotably support-ed in bearing blocks 47. Additionally or alternatively to it, the sup-port body 43 can be shifted toward the wire 1 or away from it, along with the bearing blocks 47.
According to Fig. 8, the water spray system, referenced 46' overall, is formed of two mutually parallel chambers exten~in~ transverse to the direction of wire travel; these are a distribution chamber 48, to which a water supply line 50 is hooked, and a nozzle chamber 49. Distributed across the length of the chambers, several channels 51 connect the dis-tribution chamber 48 with the nozzle chamber 49. This ensures that the water discharge velocity is uniform across the width of the wire 1. In variation from Fig. 3, the di~tribution could be replaced by a pipe which through several lines corresponding to the channels 51 is con-nected to the nozzle chamber 49.
A series of individual spray nozzles may be provided on the nozzle cham-ber 49. Alternatively to it, a water discharge gap 52 forms according to Fig. 8 between two walls of the nozzle chamber. If a variability of the amount and/or discharge velocity of the water is desired, a wall 53 of the nozzle chamber 49 (which at the same time is a defining wall of the distribution chamber 48) can be shifted back or forth in the direction of double arrow 54, thereby varying the clearance of the gap 52.
2~78~74 According to Fig. 6 and 7, the water spray system 46 comprises a spray pipe 56 which extends across the entire wire width, and additionally, in the area of the two web edges, an edge spray pipe 57 each (of which only one is visible in the drawing). The edge spray pipe 57 has per centime-ter of wire width a greater number of spray noz~les, which are arranged distributed across the width R of the edge strip. As is known, an edge strip is normally trimmed off the paper web formed in the wire section, on each of the two edges, which edge strip must in normal operation be picked off the wire 1 by means of the wire cleaning system 40~ Only the r~-ining paper web with the width P continues to be advanced by means of the felt 38.
Now and then it happens that the width P of the paper web to be produced needs to be changed. To enable the adaptation of the wire cleaning system 40 to different web widths P, the following is provided for: The edge spray pipe 57 can be moved parallel to the blowing slot 44. Be-sides, the length (P + 2R - measured crosswise to the wire travel direc-tion) of the blowing slot 44 is variable with the aid of adjustable edge slides 58.
Fig. 6 also shows the control of the hydraulic cylinders 39 of the pick-up suction roll 37 and the control of the air and water supply to the wire cleaning system 40. Illustrated is a central control unit 60, a water pump 61 and a compressed air supply 62. The compressed air line 63 with pressure control valve 64 connects the compressed air supply 52 via 2078~ 7~
the hollow support body 43 to the blowing slot 44. The water pump 61 connects directly to the edge spray pipe 57, through a line 65. Addi-tionally provided is a line 66 with pressure control valve 67 for sup-plying the spray pipe 56. A com~on control line 6~ connects the control center 60, for one, with the pressure control valves 64 and 67 and, for another, with a transmitter 69 controlling the hydraulic cylinders 39.
The following can be accomplished thereby: During normal operation (pick-up suction roll 37 tou~ing the wire 1) air and water are supplied to the wire cleaning system 40 at relatively low pressure. An exception are only the edge spray pipes 57, to which water is fed at high pressure through the line 65, so that the edge strips will be safely removed from the wire l. As soon as the control center 60 emits a signal for liftoff of the pick-up suction roll 37 from the wire l (or shortly before), the pressure control valves 64 and 67 ad~ust automatically to the effect that now the air pressure and water pressure will be raised. Consequent-ly, the wire cleaning system 40 is immediately able to separate the en-tire web (with width P + 2R) from the wire 1. What this control achieves is that in normal operation the air and water coY,s~ ,tion will be rela-tively low and that the wire cleaning system 40 can automatically be put in a state where it carries a higher operating pressure, which is re-quired in lifting the pick-up suction roll 37 off the wire l or separat-ing the entire web.
Another possibility for reduction of the air and/or water consumption in normal operation is given by the following: A time relay 70 can be con-2078~7~
nected through lines 71 and/or 72 with the pressure control valves 64and/or 67. This time relay can in adjustable time intervals initiate a temporary pressure increase in the lines 63 and/or 66. Achieved thereby, temporarily, is an increased clenn~'ng e~fect at, on average, low air and water consumption.
Th- i~vention will b- morc fully explain-t with tho aid of the trawing, which in detail~ shows in ~ig 1 through 4, schematic illustrations of variow wire sections for for paper ~rhin~;
Fig 5, scaled up, th- actual system according to the invention, with high-pressure blow nozzle and a water spray system;
Fig 6, schematically, part of a paper ~ n- wire section with a wire cleaning systs2;
Fig 7, a partial view of th- wire cleaning systcm in the direction of arrow II in Fig 6;
Fig 8, scal-d up and motifiet as compar-d to Fig 6, a partial cross section of the wir- cleaning system The wire section illustrated in Fig 1 features a wire 1 wrapping around a number of rolls and mo~ing in th- dir-ction of the arrow The actual cleaning de~ic- comprisas espacially the high-pressure blow nozzle 2 and a spray pipe 3 for application of water ~-ts Further cleaning organs are arranget aheat, for instanc- another spray pip- 4, which shoots water ~ets through tha wire 1 The water ~etQ are collectet in a suction hood 5 2078~7~
Coordinated with the actual, inventional cleaning system 2, 3 is a suction system 6 with a lateral vacuum connection.
In the system according to Fig. 2, blow nozzle 2 and spray pipe 3 - in this case a flat jet spray pipe ~ are again the ma~or c. ,ol~ents of the cleaning system. These two components are arranged on the inside of the wire, i.e., inside the loop formed of the wire 1. Provided on tha out-side is a hood 5 which features a water drain 10 and is hooked to a suc-tion pipe 11. Preceding the flat jet spray pipe 3 is a needle jet spray pipe 4. While this is helpful, it is not decisive though. The embodi-ments according to Fig. 3 and 4 represent modifications. Essential here are also high-pressure blow nozzle 2 with preceding spray pipe 3. The suction hoods 5 serve at the same time to collect the splash water and to provide suction. They feature appropriate connections, the same as the embodiment according to Fig. 2.
Fig. 5 depicts very exactly the structure of the high-pressure blow nozzle. It comprises an approach slat 20, a departure slat 21 and a pressure tube 22. Forming an assembly, these three said components extend across the entire -~h~n~ width, so that the wire 1 is cleaned across its entirs width. Approach slat 20 and departure slat 21 form a blowing slot 23, which without interruption can extend across the wire width. But it may also be interrupted. It may be replaced, e.g., by a number of bores, which as well extend across the entire wire width.
207~74 Decisive is the shape of the approach slat 20 and the routing of the wire 1. As can be seen, these two form an angle ~ with each other. In the present case, the angle ~ amounts to about 30~. The wedge-shaped bore 24 forming between these two tapers thus in the wire running direc-tion.
Preceding the gore 24 is a spray pipe 30 arranged in such a way that it supplies directly or indirectly spray jets 31 of water to the gore 24.
The supply may occur at a more or less high pressure.
The two slats 20 and 21 are made, at least on their surface touched by the wire, of wear-resistant material, for instance ceramic.
The wire runs on the approach slat 20, which at this point has a radius of about 10 to 50 mm. Due to its reversal, the wire is already dewatered at this radius, due to eccentric force.
The blowing slot 23 has a width of 1 to 10 mm.
The departure slo~ 21 forms in the departure area as well a radius. It ensures that the wire will not be lifted off this slat by the air pres-sure, so that the blowing air cannot escape. The radius required on the departure slat 21 depends on operating parameters such as air pressure, wire permeability, wire tension and others. The radius is so selected that the r~ining contact pressure of the wire on the reversal surface 2~7~74 of ehe departure slat 21 will be min~ -1 keeping the slat wear and wire wear as well in; ~1 The design of the control is such that the air will be turned off imme-diately in case of water failure and that the blowing nozzle will swing out of the wire - with a slight time delay~
Fig. 6 depicts a ~continuous revolving wire 1 which in known fashion runs across a wire suction roll 35 and from there across a wire cleaning system 40 and to a wire guide roll 36. The paper web appro~ching on the wire 1 (and still wet) is in normal operation picked off the wire and passed to the successive (not illustrated) press section, with the aid of a continuous felt 38 and a pick-up suction roll 37. During the start-up phase or upon operational bréakdown, the pick-up suction roll 37 is with the aid of hydraulic cylinders 39 lifted off the wire 1 in known fashion (as illustrated by dash dot lines). In this state of operation, the web runs with the wire 1 up to the wire cleaning system 40, is separated by it from the wire and runs then approximately along the broken line S downwart into a not illustrated scrap dissolution system.
As can be seen best from Fig. 8, the wire cleaning system 40 has an approach slat 41 and a departure slat 42, each touching the revolving wire 1 with a wire guide surface. The width of the wire guide surface of the approach slot 41 is marked a, the width of the wire guide surface of the departure slat is marked b. The two wire guide surfaces are approxi-2~78~7'1 mately eq~ally wide, while the overall width A of the approach slat isnearly twice as large as the overall width B of the departure slat. The wire guide surfaces may be pred~ nAntly flat (with rounded edges) or have a slightly convex curvature. The slats 41 and 42 are fastened to the support body 43 in such a way that an air blowing slot 44 L.- -~nQ
between the two slats. The support body is fashioned as a hollow body serving to supply blowing air. Forming between the approach slat 41 find the wire l is a wedge-shaped gore 45 (with angle w) tapering in the wire running direction. A water spray system 46 sprays water jets across the entire wire width into the gore 45.
At the point where the wire l leaves the wire guide surface, the depar-ture slat 42 features a stepped clearance 47; the latter forms with the wire guide surface a relatively sharp teparture edge, which the wire must touch. This configuration achieves that the surfaces of the depar-ture slat 42 which are not in contact with the wire tend less than here-tofore to A~ te dirt that might impair the proper functioning of the wire cleaning system 40.
Due to the larger overall width A of the approach slat 41, the wedse-shaped gore 45 (in the direction of wire travel) is longer than hereto-fore. This gives rise to the possibility, more so than heretofore, that the wire l accelerates the water jets coming from the water spray system 46. Thus, the pressure of the supplied water can be reduced as compared to formerly, thus saving energy. To allow the adjustment of optimum . ' 207~7~
conditions in this respect, the angle w between wire 1 and approach slat 41 is suitably changed, specifically to thereby adapt it to the wire travel speed. The support body 43 is for that purpose pivotably support-ed in bearing blocks 47. Additionally or alternatively to it, the sup-port body 43 can be shifted toward the wire 1 or away from it, along with the bearing blocks 47.
According to Fig. 8, the water spray system, referenced 46' overall, is formed of two mutually parallel chambers exten~in~ transverse to the direction of wire travel; these are a distribution chamber 48, to which a water supply line 50 is hooked, and a nozzle chamber 49. Distributed across the length of the chambers, several channels 51 connect the dis-tribution chamber 48 with the nozzle chamber 49. This ensures that the water discharge velocity is uniform across the width of the wire 1. In variation from Fig. 3, the di~tribution could be replaced by a pipe which through several lines corresponding to the channels 51 is con-nected to the nozzle chamber 49.
A series of individual spray nozzles may be provided on the nozzle cham-ber 49. Alternatively to it, a water discharge gap 52 forms according to Fig. 8 between two walls of the nozzle chamber. If a variability of the amount and/or discharge velocity of the water is desired, a wall 53 of the nozzle chamber 49 (which at the same time is a defining wall of the distribution chamber 48) can be shifted back or forth in the direction of double arrow 54, thereby varying the clearance of the gap 52.
2~78~74 According to Fig. 6 and 7, the water spray system 46 comprises a spray pipe 56 which extends across the entire wire width, and additionally, in the area of the two web edges, an edge spray pipe 57 each (of which only one is visible in the drawing). The edge spray pipe 57 has per centime-ter of wire width a greater number of spray noz~les, which are arranged distributed across the width R of the edge strip. As is known, an edge strip is normally trimmed off the paper web formed in the wire section, on each of the two edges, which edge strip must in normal operation be picked off the wire 1 by means of the wire cleaning system 40~ Only the r~-ining paper web with the width P continues to be advanced by means of the felt 38.
Now and then it happens that the width P of the paper web to be produced needs to be changed. To enable the adaptation of the wire cleaning system 40 to different web widths P, the following is provided for: The edge spray pipe 57 can be moved parallel to the blowing slot 44. Be-sides, the length (P + 2R - measured crosswise to the wire travel direc-tion) of the blowing slot 44 is variable with the aid of adjustable edge slides 58.
Fig. 6 also shows the control of the hydraulic cylinders 39 of the pick-up suction roll 37 and the control of the air and water supply to the wire cleaning system 40. Illustrated is a central control unit 60, a water pump 61 and a compressed air supply 62. The compressed air line 63 with pressure control valve 64 connects the compressed air supply 52 via 2078~ 7~
the hollow support body 43 to the blowing slot 44. The water pump 61 connects directly to the edge spray pipe 57, through a line 65. Addi-tionally provided is a line 66 with pressure control valve 67 for sup-plying the spray pipe 56. A com~on control line 6~ connects the control center 60, for one, with the pressure control valves 64 and 67 and, for another, with a transmitter 69 controlling the hydraulic cylinders 39.
The following can be accomplished thereby: During normal operation (pick-up suction roll 37 tou~ing the wire 1) air and water are supplied to the wire cleaning system 40 at relatively low pressure. An exception are only the edge spray pipes 57, to which water is fed at high pressure through the line 65, so that the edge strips will be safely removed from the wire l. As soon as the control center 60 emits a signal for liftoff of the pick-up suction roll 37 from the wire l (or shortly before), the pressure control valves 64 and 67 ad~ust automatically to the effect that now the air pressure and water pressure will be raised. Consequent-ly, the wire cleaning system 40 is immediately able to separate the en-tire web (with width P + 2R) from the wire 1. What this control achieves is that in normal operation the air and water coY,s~ ,tion will be rela-tively low and that the wire cleaning system 40 can automatically be put in a state where it carries a higher operating pressure, which is re-quired in lifting the pick-up suction roll 37 off the wire l or separat-ing the entire web.
Another possibility for reduction of the air and/or water consumption in normal operation is given by the following: A time relay 70 can be con-2078~7~
nected through lines 71 and/or 72 with the pressure control valves 64and/or 67. This time relay can in adjustable time intervals initiate a temporary pressure increase in the lines 63 and/or 66. Achieved thereby, temporarily, is an increased clenn~'ng e~fect at, on average, low air and water consumption.
Claims (18)
1. A device for cleaning a wire web, the wire web supporting a fiber material web and defining a running direction, said device comprising:
two elongated members disposed parallel to each other and extending cross-wise to the running direction of the wire web, said two elongated members comprising an elongated approach member and an elongated departure member, said elongated approach member and said elongated departure member each having a wire guide surface contacting the wire web;
a blowing slot disposed between said elongated approach member and said elongated departure member, said blowing slot adapted to be connected to an air supply;
a wedge-shaped space defined by and between said elongated approach member and the wire web, said wedge-shaped space tapering in the running direction of the wire web; and a water spray system, said water spray system adapted to spray water into said wedge-shaped space.
two elongated members disposed parallel to each other and extending cross-wise to the running direction of the wire web, said two elongated members comprising an elongated approach member and an elongated departure member, said elongated approach member and said elongated departure member each having a wire guide surface contacting the wire web;
a blowing slot disposed between said elongated approach member and said elongated departure member, said blowing slot adapted to be connected to an air supply;
a wedge-shaped space defined by and between said elongated approach member and the wire web, said wedge-shaped space tapering in the running direction of the wire web; and a water spray system, said water spray system adapted to spray water into said wedge-shaped space.
2. The wire web cleaning device of claim 1, said elongated approach member and the wire web defining an angle ~ therebetween, said angle ~ ranging between 10° and 45°.
3. The wire web cleaning device of claim 1, wherein said elongated approach member and the wire web form an angle of 30° therebetween.
4. The wire web cleaning device of claim 1, wherein said spray system is a nozzle pipe with a plurality of flat spray nozzles.
5. The wire web cleaning device of claim 1, wherein said blowing slot is formed by a plurality of side-by-side bores.
6. The wire web cleaning device of claim 1, wherein said blowing slot is formed by a plurality of side-by-side individual slots.
7. The wire web cleaning device of claim 1, wherein said elongated departure member includes a step clearance disposed where the wire web leaves the wire guide surface.
8. The wire web cleaning device of claims 1, wherein said elongated approach member wire guide surface and said elongated departure member wire guide surface have about an equal length, and wherein an overall length of said elongated approach member is about 1.5 to 3 times the overall length of said elongated departure member.
9. The wire web cleaning device of claim 1, further comprising a support body, said elongated approach member and said elongated departure member engaging said support body, said support body providing an adjustable angle between said elongated approach member and the wire web, said support body pivotable about an axis disposed parallel to said blowing slot.
10. The wire web cleaning device of claim 1, further comprising a support body, said elongated approach member and said elongated departure member engaging said support body, said support body providing an adjustable angle between said elongated approach member and the wire webs, said support body movable in a direction toward and from the wire web.
11. The wire web cleaning device of claim 1, wherein said water spray system includes a distribution chamber and a nozzle chamber, said distribution chamber and said nozzle chamber being mutually parallel and extending cross-wise to the running direction of the wire web, said distribution chamber adapted to be connected to a water feed line, said distribution chamber communicating through a plurality of channels disposed across the width of the wire web with said nozzlechamber, said nozzle chamber provided with at least one spray opening.
12. The wire web cleaning device of claim 11, wherein said nozzle chamber is disposed immediately before said approach slat.
13. The wire web cleaning device of claim 11, wherein said nozzle chamber includes a water spray opening having a slit-type gap with an adjustable clearance.
14. The wire web cleaning device of claim 13, wherein said wire web comprises an endless wire web, said nozzle chamber disposed inside said endless wire web at a location where the fiber material web is separated from the wire web.
15. The wire web cleaning device of claim 14, wherein said water spray system delivers a quantity of water per centimeter of fiber material web width which ishigher in the area of the two fiber material web edges than in the center area of the fiber material web.
16. The wire web cleaning device of claim 15, wherein said water spray system includes a spray pipe extending across the enter wire web width, and an edge spray pipe disposed in the area of the two fiber material web edges, said spray pipe and said edge spray pipe movable in a direction parallel to said blowing slot.
17. The wire web cleaning device of claim 14, with a pickup device disposed adjacent to the wire web, the pickup device movable to be lifted off the wire web, and further comprising a control device for selectively controlling the pressure of air supplied to said blowing slot and water supplied to said spray system, and control device selectively causing a pressure increase during one of shortly before and when the pickup device lifts off the wire web.
18. The wire web cleaning device of claim 1, further comprising a control device for selectively controlling the pressure of air supplied to said blowing slot and water supplied to said spray system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4101350A DE4101350A1 (en) | 1990-06-06 | 1991-01-18 | Continuous fourdrinier cleaner preventing build=up of dirt - has set-back step at the second support bar where the paper web is detached |
| DEP4101350.6 | 1991-01-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2078574A1 CA2078574A1 (en) | 1992-07-19 |
| CA2078574C true CA2078574C (en) | 1998-06-16 |
Family
ID=6423244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002078574A Expired - Fee Related CA2078574C (en) | 1991-01-18 | 1991-06-19 | Device for cleaning a revolving paper machine wire |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0522093B1 (en) |
| JP (1) | JP2874799B2 (en) |
| AT (1) | ATE161058T1 (en) |
| CA (1) | CA2078574C (en) |
| DE (1) | DE59108903D1 (en) |
| ES (1) | ES2112273T3 (en) |
| FI (1) | FI96975B (en) |
| WO (1) | WO1992013132A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4327601C1 (en) * | 1993-08-17 | 1995-01-05 | Voith Gmbh J M | Device for cleaning a circulating wire (fabric) |
| FI1126U1 (en) * | 1993-10-13 | 1994-01-14 | Ypaejaen Konepaja Oy | Rengoeringsanordning |
| DE4402279C2 (en) * | 1994-01-27 | 1997-04-24 | Voith Gmbh J M | Method and device for cleaning a rotating paper machine wire |
| FI97632B (en) * | 1995-01-23 | 1996-10-15 | Ev Group Oy | Procedure for washing cloths, especially paper machine cloths |
| FI97157C (en) * | 1995-09-15 | 1996-10-25 | Valmet Corp | Apparatus for washing wire in a paper / board machine |
| JP3621836B2 (en) * | 1998-10-09 | 2005-02-16 | 三菱重工業株式会社 | Wire machine for paper machine former |
| ATE395459T1 (en) | 2003-04-04 | 2008-05-15 | Voith Patent Gmbh | DEVICE FOR CLEANING A CIRCULATING BELT |
| EP1657357B1 (en) | 2003-08-19 | 2012-04-11 | Aoki Machinery Co., Ltd | Cleaning device of band-like apparatus |
| DE102007028220A1 (en) | 2007-06-20 | 2008-12-24 | Voith Patent Gmbh | Wire section of a machine for producing a fibrous web |
| US10201840B2 (en) | 2012-04-11 | 2019-02-12 | Gpcp Ip Holdings Llc | Process for cleaning a transport belt for manufacturing a paper web |
| DE102016218199A1 (en) * | 2016-09-22 | 2018-03-22 | Voith Patent Gmbh | Lubrication device for lubricating a belt |
| US20210107176A1 (en) * | 2016-11-29 | 2021-04-15 | Seiko Epson Corporation | Sheet manufacturing apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE106201C (en) * | ||||
| US1406821A (en) * | 1919-07-09 | 1922-02-14 | Edward D Bennett | Felt-cleaning device for paper-making machines |
| US3347740A (en) * | 1963-10-14 | 1967-10-17 | Rice Barton Corp | Method and apparatus for purging travelling felts |
| DE2058461A1 (en) * | 1970-11-27 | 1972-05-31 | Bird Machine Co | Paper web felt dehydrating device - formed by a suction slot followed by blower slot |
| AT327674B (en) * | 1973-03-10 | 1976-02-10 | Voith Gmbh J M | DEVICE FOR CLEANING AND DRAINING CIRCULATING FELT LINES |
| US4154648A (en) * | 1974-03-08 | 1979-05-15 | Nordiska Maskinfilt Aktiebolaget | Method for separating a paper web from a forming fabric in a paper-making machine |
| FR2540082B1 (en) * | 1982-09-23 | 1987-02-06 | Vuillaume Andre | UNIVERSAL RINSING APPARATUS, PARTICULARLY FOR THE PAPER INDUSTRY, BELT CONVEYORS AND THE LIKE |
-
1991
- 1991-06-19 AT AT91911380T patent/ATE161058T1/en not_active IP Right Cessation
- 1991-06-19 DE DE59108903T patent/DE59108903D1/en not_active Expired - Fee Related
- 1991-06-19 FI FI924175A patent/FI96975B/en not_active IP Right Cessation
- 1991-06-19 EP EP91911380A patent/EP0522093B1/en not_active Expired - Lifetime
- 1991-06-19 JP JP3510920A patent/JP2874799B2/en not_active Expired - Lifetime
- 1991-06-19 CA CA002078574A patent/CA2078574C/en not_active Expired - Fee Related
- 1991-06-19 WO PCT/EP1991/001129 patent/WO1992013132A1/en active IP Right Grant
- 1991-06-19 ES ES91911380T patent/ES2112273T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59108903D1 (en) | 1998-01-22 |
| FI924175A0 (en) | 1992-09-17 |
| EP0522093A1 (en) | 1993-01-13 |
| WO1992013132A1 (en) | 1992-08-06 |
| ATE161058T1 (en) | 1997-12-15 |
| FI96975B (en) | 1996-06-14 |
| EP0522093B1 (en) | 1997-12-10 |
| CA2078574A1 (en) | 1992-07-19 |
| ES2112273T3 (en) | 1998-04-01 |
| JP2874799B2 (en) | 1999-03-24 |
| JPH05504604A (en) | 1993-07-15 |
| FI924175L (en) | 1992-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20000619 |