CA2412248A1 - Device for cleaning at least one wire in a plant for producing paper - Google Patents
Device for cleaning at least one wire in a plant for producing paper Download PDFInfo
- Publication number
- CA2412248A1 CA2412248A1 CA002412248A CA2412248A CA2412248A1 CA 2412248 A1 CA2412248 A1 CA 2412248A1 CA 002412248 A CA002412248 A CA 002412248A CA 2412248 A CA2412248 A CA 2412248A CA 2412248 A1 CA2412248 A1 CA 2412248A1
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- Canada
- Prior art keywords
- wire
- vacuum chamber
- vacuum
- roll
- over
- 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.)
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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
-
- 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
- D21F1/34—Construction or arrangement of spraying pipes
Abstract
A device for cleaning the at least one wire (1) in a plant for producing paper, in which the wire (1) is l.ed over rolls (11), comprising at least one vacuum chamber (51, 52) which bears against the wire (1) and at least one spray nozzle (57) arranged in said vacuum chamber (51, 52), through which a cleaning liquid, in particular water, can be applied to the wire (1). In this case the at least one vacuum chamber (51, 52) is arranged radially outside one of the rolls (11c), the wire (1) in the area of the vacuum chamber (51, 52) bearing on this roll (11c) at least over a major part of its length (Fig.
1).
1).
Description
DEVICE FOR CLEANING AT LEAST ONE WIRE IN A F?LANT FOR PRODUCING
PAPER
The present invention relates to a device for cleaning the at least one vaire in a plant for producing paper, in which the wire is led over rolls, comprising at least: one vacuum chamber which bears against the wire and at least one spray nozzle arranged in said vacuum chamk;er, through which a cleaning liquid, in particular water, can be applied to the wire.
In plants for producing paper, a fibrous suspension is applied to an intrinsically closed wire lecl over rolls. Plants are also known in which two wires are ~~rovi_ded, between which the paper web is produced. In all the plants there is the requirement for the at least one wire, in an area in which it is lifted off the paper vaeb and led back t.o the start of the plant, to be cleaned from cornponent;s remaining in and on it, in particular pulp fibers, and to be dried.
US 6,099,691 A discloses a device for cleaning the wire of a plant for producing paper, which device comprises four vacuum chambers, of which ira each case t:wo are arranged on both sides of a wire and in whic:O there are s~>ray nozzles, through which water is sprayed onto both s~.~rf:ac:es of the wire, as a result of which the latter i.s cleaned. The water applied through the spray nozzles is fed from the vacuum chambers to a separator.
In addition, the wire is acted on by air in one of the vacuum chambers in order to dry it.
Such known devices for cleaning <~ wire are, however, afflicted by a number of disadvantages:
Since vacuum chambers are provided on both sides of the wire, a very great amount of space is necessitated by this device.
Since the wire is led through between at least two vacuum chambers, coming into contact with the edges of their entry and exit slots, there is additionally the risk that it will be damaged by the movement over these edges. Tn addition, there is the requirement to connect the vacuum chambers arranged on both sides of the wire to separate vacuum sources and, in addition, to assign water separators in each case to these.
Furthermore, the water applied to t:he wire by the spray nozzles passes through said wire, carrying the contaminates with it. However, since the predominant proportion of the contaminants is located on that side of the wire on which the paper web rests, this necessitates the water applied to this side of the wire carrying the contaminants through the wire into the vacuum chamber arranged on the other side of the wire. As a result, this c~~.eaning device has a very poor efficiency and/or is relatively expensive in operation.
The present invention is therefore based on the object of providing a device for cleaning the at least one wire in a plant for producing paper by means of which the disadvantages attached to the known prior art are avoided. According to the invention, this is achieved in that the at least one vacuum chamber is arranged radially outside one of the rolls, over which the wire is led back to the start of the plant, the wire in the effective area of said vacuum chamber bearing on this roll at least over a major part of its length.
Therefore, at least one vacuum chamber is provided only on that side of the wire on whch the paper web has come to rest and on which the major part of the contaminants is found. By means of the at least one spray nozzle located in this vacuum chamber, the cleaning liquid is sprayed onto the wire resting on the roll, and emerges from the wire again on this side, carrying the contaminants with it. By reducing the number of vacuum chambers provided an<j the vacuum sources associated with the latter, a decisive constructional simplification is achieved, although the effectiveness of the cleaning is increased. In addition, the operating costs are decisively reduced by this means. Since, in addition, the wire is led over a roll in the area of the at least one vacuum chamber, its movement path is defined, as a result of which the side edges of the vacuum chambers are at a defined distance with respect to that side of the wire on which the paper web comes to rest. By this means, any damage to the wire resulting from the edges of the entry and exit openings of the at least one vacuum chamber is ruled out.
The at least one vacuum chamber is preferably sealed off with respect to the wire led over the roll by means of sealing strips aligned transversely with. respect t:o the direction of movement of t}~e wire. Furthermore, the wire in the area of the first vacuum chamber preferably bears on the roll over the length of this vacuum chamber. Tn addition, the angle of the jet direction of the at least one spray nozzle arranged on a spray pipe in the first vacuum chamber is preferably adjustable in the direction of movement of the wire.
According to a preferred embodiment, at least one second vacuum chamber is provided radially outside the roll in the direction of movement of the wire, in addition to the at least one vacuum chamber. In this case, the wire in the area of the first vacuum chamber can bear on the roll. over its entire length, and the area of the wire in the effective area of the at least one second vacuum chamber can bear on the roll over part of its length and be gifted off the roll over a further part of its length.
The at least one first vacuum chamber and the at least one second vacuum chamber are preferably connected to a common vacuum source via an extraction duct, and, furthermore, control devices are arranged between the at least one first vacuum chamber and the at least one second vacuum chamber and the vacuum source and, for example, are formed as flaps which can be pivoted about axes aligned approximately at right angles, and at least part of the at least one second vacuum chamber is formed with a cross section which increases in size transversely with resper.t to the direction of movement of the wire. The at least one second vacuum chamber is preferably formed with a height which increases in size transversely with respect to the direction of movement of the wire, at least some of the edges of the walls of the vacuum chambers, assigned to the wire and aligned transversely with respect to the direction of movement of the latter, are sealed off with respect to the wire by mean; of sealing strips, on their sides associated with the edges of the walls of the vacuum chambers, the sealing strips are formed with preferably T-shaped profiled grooves, by means of which they are pushed onto the edges of the side walls cf the vacuum chambers, and at least some of the sealing strips cre. as~~mmetrical.
Finally, the spray pipe is preferably formed with needle-jet nozzles and with flat-jet nuzzles"
The subject of the invention is explained in more detail below using an exemplary embodiment illustrated in the drawing, in which:
Fig. 1 shouas a plant for producing paper, in a schematic illustration;
Fig. 2 shows a device according to the invention, in a vertical section led in the direction of movement of the wire;
Fig. 3 shows this device in section along the line III-III in Fig. 2;
Fig. 4 shows this device in section along the line IV-IV in Fig. 2 on a scale reduced with respect to Fig. 2;
Fig. 5 shows the detail A from Fig. 2 on a scale increased 4aith respect to Fig. 2;
Fig. 6 shows the detail B from Fig. 2 on a scale increased with respect to Fig. 2;
Fig. 6a shows the detail B in a design variant on a scale increased with respect to Fig. 2; and Figs. 7,7a,7b show a component of this device, in side view, in plan view and in section.
Fig. 1 shows a plant according to the invention for producing paper, which has a first wire 1 and a second wire 2. These two wires 1 and 2, which are intrinsically closed, are moved over a plurality of guide and deflection rolls 11 and 21 associated with them at the same speed of, for examp7_e, about 40 m/sec, being led on each other in the area of the rolls 11a and 21a and separately from each other in the area of the rolls llb and 21b. In that area in which the two wires 1 and 2 are moved resting on each other, there is a spray nozzle 3. Furthermore, a plurality of suction boxers 4 is provided on both sides of the wires 1 and 2. In ac.idition, a further spray nozzle 3a and a suction box 4a are arranged in the further course of the first wire 1. Finally, cleaning device 5 for the two wires 1 and 2 are arranged in the area of the guide rolls llc and 21c.
Additional cleaning devices of this; kind may be assigned to the first wire and the second wire 2.
During the operation of this plant 1, in the area of the two rolls lla and 21a, the pulp prepared for the production of a paper web is introduced uniformly over the width of the two wires 1 and 2 in the direction of t:he arrow C between the two wires 1 and 2. By means of the suction boxes 4 provided in the course of the two wires 1 and 2, the liquid contained in the pulp is extracted, as a result of which a paper web 6 is formed which, after the second wire 2 has been lifted off the first wire l, remains on the latt:e:r, being dried further by the further suction box 4a. Finally, in the area of a deflection roll 16, it is lifted off the first wire 1 and fed t:o further processing.
The spray nozzles 3 and 3<3 are used to wet the wires 1 and 2 when no pulp is resting on them.
Since the two wires 1 and 2 have to be cleaned of cellulose fibers and the like adhering to them, the cleaning devices 5 are provided in their further movement paths, and are explained as follows:
As can be seen from Fig. 2, radially outside the guide roll llc and at that point of the wire 1 on which the paper web 6 i_s laid, there are two vacuum chambers 51 and 52 following one after the other in the c~ire~:tion of movement of the wire 1, wt,:ose suction openings wire :pealed off with respect to the wire 1 by means of sealing strips 53, 59 and 55. Inside the first vacuum chamber 51 there is a spray pipe 55 constructed with nozzles 57, via which water can be sprayed onto the associated side of the wire 1. Furthermore, control flaps 62 and 63 are assigned to the vacuum chambers 57_ and 52.
_ E~ _ As can further be seen from Fig. 3, a common suction duct 61 is connected to the two vacuum chambers 51 and 52, which leads to a water separator and to a vacuum source. The control flaps 62 and 63 are located at t=he connection between the suction duct 5 and the two vacuum chambers 51 and 52, it being possible for the control flap 62 to be pivoted about the axis 62a and the control flap h3 to be pivoted about the axis 63a at right angles to the axis 62a. By means of the control flaps 62 and 63, the vacuum prevailing in the chambers 51 and 52 can be controlled. As is additionally indicated by a double arrow D, the spray pipe 56 can be displaced to and fro in an oscillatory manner, the amplitude of the oscillatory movement being approximately equal to the spacing from one another of the spray nozzles 57 providE:d in the spray pipe 56.
As can further be seen from Fig. 9, the second vacuum chamber 52 is constructed with a base 52a running obliquely. This ensures that the suction action of: the second vacuum chamber 52 is approximately the samf:~ over the width of the wire 1.
As Fig. 5 shows, the wire 1 bears on the roll llc over its entire length in the suction area of the first vacuum chamber 51. Since, in addition, the spray pipe 56 can be rotated about its longitudinal axis, the direction of the water jets emerging from said spray pipe can be adjusted over the angular range of about a = 30° in the direction of movement of the wire 1.
As can further be ~.een from figs. 5, 6 and 6a, the upper edges of the side walls of the vacuum chambers 51 and 52 are profiled in a T-shape, and the sealing strips 53, 54 and 55 are formed with oppositely profiled grooves. By this means, the sealing strips 53, 54 and 55 can be pushed on to the upper edges of the side walls of the vacuum chambers 51 and 52. In order to be able to adjust the width of the effective area of the second vacuum chamber 52, them sealing strip 55 is asymmetrical as compared with its groove. Depending on the position in which the sea:Ling strip 55 is pushed on to the associated side wall, the effective width of the area of the second vacuum chamber 52 which is effective with respect to the wire 1 can be adjusted with the values s and s1.
As illustrated in figs. 7, as and 7b, according to a further embodiment, the spray pipe 56a is constructed with a first group of needle-jet nozzles 57a and a second group of flat-jet nozzles 57b, which are offset with respect to one another in the longitudinal direction of the spray pipe 56a, and whose jets form an acute angle of about 10° with one another.
Furthermore, the planes of '.he jei~s of the flat-jet nozzles 57b form an angle of about 5° with the plane formed by the jets of the needle-jet nozzles 57a.
The mode of action of the cleaning device 5 is explained below by using the first .wire l:
The wire l, which is constructed as an intrinsically closed belt, is placed over the guide and deflection rolls, 11, 11a, 11b and 11c, bearing on these rolls with that side which does not come into contact with the paper web 6. The cleaning device 5 assigned to the rcell 11c: has two vacuum chambers 51 and 52 which follo~,~~ each other in the direction of movement of the wire 1. In the active area of the first vacuum chamber 51, the wire 1 bears completel~,~ on the roll 11c, the vacuum chamber 51 being oru that side 4ait:h which the wire 1 is laid on the paper web 6. This is accordingly that side on which the predominant part of the paper fibers and the like are located.
The vacuum chamber 51 is sealed off with respect to the wire 1 __ g ._ by means of the sealing strips 53 and 54. Since the wire 1 is guided by the roll 11c, it is ensured that it does not rub on the sealing strips 53 and 54. This is critical because the wire 1 is very susceptible to mechanical damage.
By means of the spray pipe 56 in the vacuum chamber 51, a cleaning liquid, in particular water, is sprayed onto this side of the wire l, but does not pass through the wire 1 but instead, because of the centrifugal force which occurs as a result of the deflection of the wire 1 being moved at high speed, emerges again on the same side and is led away via the vacuum chamber 51 and the extraction line 61. Since the cleaning liquid is applied too that. side on which the contaminants are found, a very high efficiency is achieved. In order to achieve an optimum cleaning effect, the direction of the jets of the cleaning liquid with respect to the direction of movement of the Gnire 1 can be adjusted in the range of the angle a. In additicn, the spray pipe 56 executes an oscillating displacement transversely with respect to the direction of movement of the wire l, as a result of which the wire 1 is covered over its entire width by the cleaning Liquid. Contaminants are removed from the wire 1 by the cleaning liquid. The wire 1 t?~en passes into the area of the second vacuum chamber 52, which comes to act on said wire between the sealing strips 54 and 55. Tn this area, the wire 1 rests on the roll llc only in a first part, whereas it is lifted off the wire 11c: in the second part. In this area, firstly the v.~ater i.n tie wire 1 i.s extracted and, secondly, air is sucked in from tre outside, as a result of which the wire 1 is dried.
The action of the vacuum chambers 51 and 52 is controlled by means of the control flaps 62 and 63. Since the second vacuum chamber 52 is constructed with a cross section which widens in ._ g ._ the suction direction, a uniform suction action is achieved over the width of the wire 1.
By means of the needle-jet nozzles 57a, the surface of the wire 1 is cleaned in the first vacuum chamber 51, dirt particles which have been deposited and dried on to said wire being removed there. By means of t:~e flat-jet nozzles 57b, the cavities in the wire 1 are filled 'with water. In the second vacuum chamber 52, this water is sucked out and, with the latter, the fine particles out of the wire 1.
A device is therefore provided which, as compared with known cleaning devices, has a simplified constructional design, as a result of Gahich it is cheaper to ~~roduce and also takes up lass space, 4.'hlCh is far mora effective and economic and cheaper in operation and in which damage to the wire which is very susceptible to damage, is avoided to the greatest possible extent.
PAPER
The present invention relates to a device for cleaning the at least one vaire in a plant for producing paper, in which the wire is led over rolls, comprising at least: one vacuum chamber which bears against the wire and at least one spray nozzle arranged in said vacuum chamk;er, through which a cleaning liquid, in particular water, can be applied to the wire.
In plants for producing paper, a fibrous suspension is applied to an intrinsically closed wire lecl over rolls. Plants are also known in which two wires are ~~rovi_ded, between which the paper web is produced. In all the plants there is the requirement for the at least one wire, in an area in which it is lifted off the paper vaeb and led back t.o the start of the plant, to be cleaned from cornponent;s remaining in and on it, in particular pulp fibers, and to be dried.
US 6,099,691 A discloses a device for cleaning the wire of a plant for producing paper, which device comprises four vacuum chambers, of which ira each case t:wo are arranged on both sides of a wire and in whic:O there are s~>ray nozzles, through which water is sprayed onto both s~.~rf:ac:es of the wire, as a result of which the latter i.s cleaned. The water applied through the spray nozzles is fed from the vacuum chambers to a separator.
In addition, the wire is acted on by air in one of the vacuum chambers in order to dry it.
Such known devices for cleaning <~ wire are, however, afflicted by a number of disadvantages:
Since vacuum chambers are provided on both sides of the wire, a very great amount of space is necessitated by this device.
Since the wire is led through between at least two vacuum chambers, coming into contact with the edges of their entry and exit slots, there is additionally the risk that it will be damaged by the movement over these edges. Tn addition, there is the requirement to connect the vacuum chambers arranged on both sides of the wire to separate vacuum sources and, in addition, to assign water separators in each case to these.
Furthermore, the water applied to t:he wire by the spray nozzles passes through said wire, carrying the contaminates with it. However, since the predominant proportion of the contaminants is located on that side of the wire on which the paper web rests, this necessitates the water applied to this side of the wire carrying the contaminants through the wire into the vacuum chamber arranged on the other side of the wire. As a result, this c~~.eaning device has a very poor efficiency and/or is relatively expensive in operation.
The present invention is therefore based on the object of providing a device for cleaning the at least one wire in a plant for producing paper by means of which the disadvantages attached to the known prior art are avoided. According to the invention, this is achieved in that the at least one vacuum chamber is arranged radially outside one of the rolls, over which the wire is led back to the start of the plant, the wire in the effective area of said vacuum chamber bearing on this roll at least over a major part of its length.
Therefore, at least one vacuum chamber is provided only on that side of the wire on whch the paper web has come to rest and on which the major part of the contaminants is found. By means of the at least one spray nozzle located in this vacuum chamber, the cleaning liquid is sprayed onto the wire resting on the roll, and emerges from the wire again on this side, carrying the contaminants with it. By reducing the number of vacuum chambers provided an<j the vacuum sources associated with the latter, a decisive constructional simplification is achieved, although the effectiveness of the cleaning is increased. In addition, the operating costs are decisively reduced by this means. Since, in addition, the wire is led over a roll in the area of the at least one vacuum chamber, its movement path is defined, as a result of which the side edges of the vacuum chambers are at a defined distance with respect to that side of the wire on which the paper web comes to rest. By this means, any damage to the wire resulting from the edges of the entry and exit openings of the at least one vacuum chamber is ruled out.
The at least one vacuum chamber is preferably sealed off with respect to the wire led over the roll by means of sealing strips aligned transversely with. respect t:o the direction of movement of t}~e wire. Furthermore, the wire in the area of the first vacuum chamber preferably bears on the roll over the length of this vacuum chamber. Tn addition, the angle of the jet direction of the at least one spray nozzle arranged on a spray pipe in the first vacuum chamber is preferably adjustable in the direction of movement of the wire.
According to a preferred embodiment, at least one second vacuum chamber is provided radially outside the roll in the direction of movement of the wire, in addition to the at least one vacuum chamber. In this case, the wire in the area of the first vacuum chamber can bear on the roll. over its entire length, and the area of the wire in the effective area of the at least one second vacuum chamber can bear on the roll over part of its length and be gifted off the roll over a further part of its length.
The at least one first vacuum chamber and the at least one second vacuum chamber are preferably connected to a common vacuum source via an extraction duct, and, furthermore, control devices are arranged between the at least one first vacuum chamber and the at least one second vacuum chamber and the vacuum source and, for example, are formed as flaps which can be pivoted about axes aligned approximately at right angles, and at least part of the at least one second vacuum chamber is formed with a cross section which increases in size transversely with resper.t to the direction of movement of the wire. The at least one second vacuum chamber is preferably formed with a height which increases in size transversely with respect to the direction of movement of the wire, at least some of the edges of the walls of the vacuum chambers, assigned to the wire and aligned transversely with respect to the direction of movement of the latter, are sealed off with respect to the wire by mean; of sealing strips, on their sides associated with the edges of the walls of the vacuum chambers, the sealing strips are formed with preferably T-shaped profiled grooves, by means of which they are pushed onto the edges of the side walls cf the vacuum chambers, and at least some of the sealing strips cre. as~~mmetrical.
Finally, the spray pipe is preferably formed with needle-jet nozzles and with flat-jet nuzzles"
The subject of the invention is explained in more detail below using an exemplary embodiment illustrated in the drawing, in which:
Fig. 1 shouas a plant for producing paper, in a schematic illustration;
Fig. 2 shows a device according to the invention, in a vertical section led in the direction of movement of the wire;
Fig. 3 shows this device in section along the line III-III in Fig. 2;
Fig. 4 shows this device in section along the line IV-IV in Fig. 2 on a scale reduced with respect to Fig. 2;
Fig. 5 shows the detail A from Fig. 2 on a scale increased 4aith respect to Fig. 2;
Fig. 6 shows the detail B from Fig. 2 on a scale increased with respect to Fig. 2;
Fig. 6a shows the detail B in a design variant on a scale increased with respect to Fig. 2; and Figs. 7,7a,7b show a component of this device, in side view, in plan view and in section.
Fig. 1 shows a plant according to the invention for producing paper, which has a first wire 1 and a second wire 2. These two wires 1 and 2, which are intrinsically closed, are moved over a plurality of guide and deflection rolls 11 and 21 associated with them at the same speed of, for examp7_e, about 40 m/sec, being led on each other in the area of the rolls 11a and 21a and separately from each other in the area of the rolls llb and 21b. In that area in which the two wires 1 and 2 are moved resting on each other, there is a spray nozzle 3. Furthermore, a plurality of suction boxers 4 is provided on both sides of the wires 1 and 2. In ac.idition, a further spray nozzle 3a and a suction box 4a are arranged in the further course of the first wire 1. Finally, cleaning device 5 for the two wires 1 and 2 are arranged in the area of the guide rolls llc and 21c.
Additional cleaning devices of this; kind may be assigned to the first wire and the second wire 2.
During the operation of this plant 1, in the area of the two rolls lla and 21a, the pulp prepared for the production of a paper web is introduced uniformly over the width of the two wires 1 and 2 in the direction of t:he arrow C between the two wires 1 and 2. By means of the suction boxes 4 provided in the course of the two wires 1 and 2, the liquid contained in the pulp is extracted, as a result of which a paper web 6 is formed which, after the second wire 2 has been lifted off the first wire l, remains on the latt:e:r, being dried further by the further suction box 4a. Finally, in the area of a deflection roll 16, it is lifted off the first wire 1 and fed t:o further processing.
The spray nozzles 3 and 3<3 are used to wet the wires 1 and 2 when no pulp is resting on them.
Since the two wires 1 and 2 have to be cleaned of cellulose fibers and the like adhering to them, the cleaning devices 5 are provided in their further movement paths, and are explained as follows:
As can be seen from Fig. 2, radially outside the guide roll llc and at that point of the wire 1 on which the paper web 6 i_s laid, there are two vacuum chambers 51 and 52 following one after the other in the c~ire~:tion of movement of the wire 1, wt,:ose suction openings wire :pealed off with respect to the wire 1 by means of sealing strips 53, 59 and 55. Inside the first vacuum chamber 51 there is a spray pipe 55 constructed with nozzles 57, via which water can be sprayed onto the associated side of the wire 1. Furthermore, control flaps 62 and 63 are assigned to the vacuum chambers 57_ and 52.
_ E~ _ As can further be seen from Fig. 3, a common suction duct 61 is connected to the two vacuum chambers 51 and 52, which leads to a water separator and to a vacuum source. The control flaps 62 and 63 are located at t=he connection between the suction duct 5 and the two vacuum chambers 51 and 52, it being possible for the control flap 62 to be pivoted about the axis 62a and the control flap h3 to be pivoted about the axis 63a at right angles to the axis 62a. By means of the control flaps 62 and 63, the vacuum prevailing in the chambers 51 and 52 can be controlled. As is additionally indicated by a double arrow D, the spray pipe 56 can be displaced to and fro in an oscillatory manner, the amplitude of the oscillatory movement being approximately equal to the spacing from one another of the spray nozzles 57 providE:d in the spray pipe 56.
As can further be seen from Fig. 9, the second vacuum chamber 52 is constructed with a base 52a running obliquely. This ensures that the suction action of: the second vacuum chamber 52 is approximately the samf:~ over the width of the wire 1.
As Fig. 5 shows, the wire 1 bears on the roll llc over its entire length in the suction area of the first vacuum chamber 51. Since, in addition, the spray pipe 56 can be rotated about its longitudinal axis, the direction of the water jets emerging from said spray pipe can be adjusted over the angular range of about a = 30° in the direction of movement of the wire 1.
As can further be ~.een from figs. 5, 6 and 6a, the upper edges of the side walls of the vacuum chambers 51 and 52 are profiled in a T-shape, and the sealing strips 53, 54 and 55 are formed with oppositely profiled grooves. By this means, the sealing strips 53, 54 and 55 can be pushed on to the upper edges of the side walls of the vacuum chambers 51 and 52. In order to be able to adjust the width of the effective area of the second vacuum chamber 52, them sealing strip 55 is asymmetrical as compared with its groove. Depending on the position in which the sea:Ling strip 55 is pushed on to the associated side wall, the effective width of the area of the second vacuum chamber 52 which is effective with respect to the wire 1 can be adjusted with the values s and s1.
As illustrated in figs. 7, as and 7b, according to a further embodiment, the spray pipe 56a is constructed with a first group of needle-jet nozzles 57a and a second group of flat-jet nozzles 57b, which are offset with respect to one another in the longitudinal direction of the spray pipe 56a, and whose jets form an acute angle of about 10° with one another.
Furthermore, the planes of '.he jei~s of the flat-jet nozzles 57b form an angle of about 5° with the plane formed by the jets of the needle-jet nozzles 57a.
The mode of action of the cleaning device 5 is explained below by using the first .wire l:
The wire l, which is constructed as an intrinsically closed belt, is placed over the guide and deflection rolls, 11, 11a, 11b and 11c, bearing on these rolls with that side which does not come into contact with the paper web 6. The cleaning device 5 assigned to the rcell 11c: has two vacuum chambers 51 and 52 which follo~,~~ each other in the direction of movement of the wire 1. In the active area of the first vacuum chamber 51, the wire 1 bears completel~,~ on the roll 11c, the vacuum chamber 51 being oru that side 4ait:h which the wire 1 is laid on the paper web 6. This is accordingly that side on which the predominant part of the paper fibers and the like are located.
The vacuum chamber 51 is sealed off with respect to the wire 1 __ g ._ by means of the sealing strips 53 and 54. Since the wire 1 is guided by the roll 11c, it is ensured that it does not rub on the sealing strips 53 and 54. This is critical because the wire 1 is very susceptible to mechanical damage.
By means of the spray pipe 56 in the vacuum chamber 51, a cleaning liquid, in particular water, is sprayed onto this side of the wire l, but does not pass through the wire 1 but instead, because of the centrifugal force which occurs as a result of the deflection of the wire 1 being moved at high speed, emerges again on the same side and is led away via the vacuum chamber 51 and the extraction line 61. Since the cleaning liquid is applied too that. side on which the contaminants are found, a very high efficiency is achieved. In order to achieve an optimum cleaning effect, the direction of the jets of the cleaning liquid with respect to the direction of movement of the Gnire 1 can be adjusted in the range of the angle a. In additicn, the spray pipe 56 executes an oscillating displacement transversely with respect to the direction of movement of the wire l, as a result of which the wire 1 is covered over its entire width by the cleaning Liquid. Contaminants are removed from the wire 1 by the cleaning liquid. The wire 1 t?~en passes into the area of the second vacuum chamber 52, which comes to act on said wire between the sealing strips 54 and 55. Tn this area, the wire 1 rests on the roll llc only in a first part, whereas it is lifted off the wire 11c: in the second part. In this area, firstly the v.~ater i.n tie wire 1 i.s extracted and, secondly, air is sucked in from tre outside, as a result of which the wire 1 is dried.
The action of the vacuum chambers 51 and 52 is controlled by means of the control flaps 62 and 63. Since the second vacuum chamber 52 is constructed with a cross section which widens in ._ g ._ the suction direction, a uniform suction action is achieved over the width of the wire 1.
By means of the needle-jet nozzles 57a, the surface of the wire 1 is cleaned in the first vacuum chamber 51, dirt particles which have been deposited and dried on to said wire being removed there. By means of t:~e flat-jet nozzles 57b, the cavities in the wire 1 are filled 'with water. In the second vacuum chamber 52, this water is sucked out and, with the latter, the fine particles out of the wire 1.
A device is therefore provided which, as compared with known cleaning devices, has a simplified constructional design, as a result of Gahich it is cheaper to ~~roduce and also takes up lass space, 4.'hlCh is far mora effective and economic and cheaper in operation and in which damage to the wire which is very susceptible to damage, is avoided to the greatest possible extent.
Claims (15)
1. A device for cleaning the at least one wire (1) in a plant for producing paper, in which the wire (1) is led over rolls (11), comprising at least once vacuum chamber (51, 52) which bears against the wire (1) and at 1-east one spray nozzle (57) arranged in said vacuum chamber (51, 52), through which a cleaning liquid, in particular water, can be applied to the wire (1), characterized in that the at least one vacuum chamber (51, 52) is arranged radially outside one of the rolls (11c), the wire in the area of the vacuum chamber (51, 52) bearing on this roll (11c) at least over a major part of its length (Fig. 2).
2. The device as claimed in patent claim 1, characterized in that the at least one vacuum chamber (51, 52) is sealed off with respect to the wire (1) led over the roll (11c) by means of sealing strips (53, 54, 55) aligned transversely with respect to the direction of movement of the wire (1).
3. The device as claimed in one of patent claims 1 and 2, characterized in that the wire (1) in the area of the first vacuum chamber (51) bears on the roll (11c) over the entire length of this vacuum chamber (51).
4. The device as claimed in one of patent claims 1 to 3, characterized in that the angle of the jet direction of the at least one spray nozzle (57) located on a spray pipe (56) in the first vacuum chamber (51) can be adjusted in the direction of movement of the wire (1).
5. The device as claimed in one of patent claims 1 to 9, characterized in than at least one second vacuum chamber (52) is provided radially outside the roll (11c) in the direction of movement of the wire (1), in addition to the at least one first vacuum chamber (51).
6. The device as claimed in patent claim 5, characterized in that the wire (1) in the area of the first vacuum chamber (51) bears on the roll (11c) over its entire length, and that the area of the wire (1) in the effective area of the at least one second vacuum chamber (52) bears on the roll (11c) over part of its length, and is lifted off the roll (11c) over a further part of its length.
7.The device as claimed in one of patent claims 5 and 6, characterized in that the at least one first vacuum chamber (51) and the at least one second vacuum chamber (52) are connected to a common vacuum source via an extraction duct (61).
8. The device as claimed in patent claim 7, characterized in that control devices are arranged between the at least one first vacuum chamber (51-) and the at least one second vacuum chamber (52) and the vacuum source.
9. The device as claimed in patent claim 8, characterized in that the control devices are formed as flaps (62, 63), which can be pivoted about axes aligned approximately at right angles.
10. The device as claimed in one of patent claims 1 to 9, characterized in that at least part of the vacuum chambers (51, 52) is formed with a cross section which increases in size transversely with respect to the direction of movement of the wire (1).
11. The device as claimed in patent claim 10, characterized in that the at least one second vacuum chamber (52) is formed with a height which increases in size transversely with respect to the direction of movement of the wire (1).
12. The device as claimed in one of patent claims 1 to 11, characterized in that at least some of the edges of the vacuum chambers (51, 52), assigned to the wire (1) and aligned transversely with respect to the direction of movement of the latter, are sealed off with respect to the wire by means of sealing strips (53, 54, 55).
13. The device as claimed in patent claim 12, characterized in that on their sides associated with the edges of the side walls of the vacuum chambers (51, 52), the sealing strips are formed with preferably T-shaped profiled grooves, by means of which they are pushed onto the edges of the side walls of the vacuum chambers (51, 52).
14. The device as claimed in one of patent claims 12 and 13, characterized in that at least some of the sealing strips (53, 54, 55) are asymmetrical.
15. The device as claimed in one of patent claims 4 to 14, characterized in that the spray pipe (56) is formed with needle-jet nozzles (57a) and with flat-jet nozzles (57b).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0183501A AT411907B (en) | 2001-11-22 | 2001-11-22 | DEVICE FOR CLEANING THE MINIMUM OF A SCREENING BELT IN A PAPER PRODUCTION PLANT |
| ATA1835/2001 | 2001-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2412248A1 true CA2412248A1 (en) | 2003-05-22 |
Family
ID=3689083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002412248A Abandoned CA2412248A1 (en) | 2001-11-22 | 2002-11-20 | Device for cleaning at least one wire in a plant for producing paper |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20030094255A1 (en) |
| EP (1) | EP1314815A1 (en) |
| AT (1) | AT411907B (en) |
| CA (1) | CA2412248A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10254059A1 (en) * | 2002-11-19 | 2004-06-03 | Robo Paper Engineering B.V. | Device and method for cleaning a material web and use of the device |
| EP1544350A1 (en) * | 2003-12-18 | 2005-06-22 | SCA Hygiene Products GmbH | Paper making machine |
| US10201840B2 (en) | 2012-04-11 | 2019-02-12 | Gpcp Ip Holdings Llc | Process for cleaning a transport belt for manufacturing a paper web |
| CN204662172U (en) * | 2013-12-20 | 2015-09-23 | 沃依特专利有限责任公司 | For cleaning the cleaning equipment of the net blanket of paper machine |
| AT518060B1 (en) | 2016-07-07 | 2017-07-15 | Klaus Ing Bartelmuss | Apparatus for cleaning a felt belt in a plant for producing a paper tape |
| DE102019120818A1 (en) * | 2019-08-01 | 2021-02-04 | Voith Patent Gmbh | Cleaning system and suction roller |
| US20210254270A1 (en) * | 2020-02-13 | 2021-08-19 | Kadant Nordic AB | Cleaning head with directional nozzle assembly and shaped external air knife for traversing shower systems |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE500772C2 (en) * | 1992-11-25 | 1994-08-29 | Staffan Sjoeberg | Device for cleaning moving objects |
| DE4402279C2 (en) * | 1994-01-27 | 1997-04-24 | Voith Gmbh J M | Method and device for cleaning a rotating paper machine wire |
| EP0731212B1 (en) * | 1995-02-24 | 2001-11-21 | Voith Paper Patent GmbH | Cleaning device |
| FI97157C (en) * | 1995-09-15 | 1996-10-25 | Valmet Corp | Apparatus for washing wire in a paper / board machine |
| NL1003070C2 (en) * | 1996-05-09 | 1997-11-18 | Robo Paper Engineering B V | Cleaning device for cleaning a dewatering screen in a wet or dry lot or a wet felt in a press lot of a papermaking machine. |
| DE19702196C5 (en) * | 1997-01-23 | 2010-04-22 | Voith Patent Gmbh | Device for cleaning a conveyor belt |
| DE19702791A1 (en) * | 1997-01-27 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Device for cleaning conveyor belt used for transporting e.g. paper or card |
| DE19726897C2 (en) * | 1997-06-25 | 2000-01-13 | Voith Sulzer Papiermasch Gmbh | Process for cleaning a conveyor belt |
| US6099691A (en) * | 1998-03-27 | 2000-08-08 | Beloit Technologies, Inc. | Apparatus for cleaning a papermaking machine forming fabric |
| DE19822185A1 (en) * | 1998-05-16 | 1999-11-18 | Voith Sulzer Papiertech Patent | Cleaning jet for wet conveyor belt used for manufacture of paper or carton |
| US6254730B1 (en) * | 1999-02-09 | 2001-07-03 | James Ross Limited | Impact angle changing shower |
-
2001
- 2001-11-22 AT AT0183501A patent/AT411907B/en not_active IP Right Cessation
-
2002
- 2002-08-29 EP EP02450188A patent/EP1314815A1/en not_active Withdrawn
- 2002-10-29 US US10/282,974 patent/US20030094255A1/en not_active Abandoned
- 2002-11-20 CA CA002412248A patent/CA2412248A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ATA18352001A (en) | 2003-12-15 |
| AT411907B (en) | 2004-07-26 |
| EP1314815A1 (en) | 2003-05-28 |
| US20030094255A1 (en) | 2003-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |