JP2001336079A - Wire washing apparatus for paper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire washing apparatus for a paper machine, designed to suppress mist generation due to washing water spouting and reduce adverse effects due to such mist generation, and ensuring both high washing efficiency and washing effect to be afforded. SOLUTION: This washing apparatus for washing wires 50 furnished on a paper machine comprises means 49 and 51 each for spouting washing water against the wires 50, a washing water retention unit 73 for retaining spouted washing water closely to the wires 50 followed by feeding the water to the wires 50, and a means 55 disposed downstream in the traveling direction of the wires 50 in the washing water retention unit 73 and intended for spouting pressurized air against the wires 50 to remove the stains on the wires 50 together with washing water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire cleaning apparatus for a paper machine for cleaning a wire in a former section of the paper machine.

[0002]

2. Description of the Related Art A paper machine is provided with a former section for forming a fiber mat. Such a paper machine former section is constructed as shown in FIG. 5, for example, for cleaning wires provided in the former section. Conventionally, a wire cleaning apparatus using a high-pressure water jet, for example, as shown in FIGS.

As shown in FIG. 5, in a paper machine former section, a paper raw material liquid 2 jetted from a head box 1 forms a top wire 3 and a bottom wire 4 guided by a forming roll 10 and a breast roll 11. The wires 3 and 4 are moved at substantially the same speed as being sandwiched by a gap formed by the two wires. Wire 3, 4
Is narrowed as it goes downstream,
First dewatering device 5 provided in the loop of bottom wire 4
Then, the fiber material mat is gradually formed by dewatering the paper raw material liquid 2 by the second dewatering device 6 provided in the loop of the top wire 3.

Further, dewatering is performed by a third dewatering device 7 provided in a loop of the bottom wire 4, and a final paper layer is formed. The paper layer thus formed is transferred to the bottom wire 4 by the transfer box 9 via the couch roll 8, and then to the press part of the next process by the suction pickup roll (not shown).

The top wire 3 and the bottom wire 4
Are endless, and are continuously used by changing the direction with a return roll 12 and a wire turning roll 13. However, in these steps,
When the wires 3 and 4 pass through the dewatering process, the paper raw material liquid 2 is entangled in the meshes of the wires 3 and 4, and at the transfer box 9 where the wires 3 and 4 are separated from the paper, paper dust on the surface of the paper is removed. By adhering to the wire 3, the wires 3 and 4 were contaminated with paper stock such as fiber and filler contained in the paper raw material.

Therefore, in order to remove dirt due to the paper material entangled or adhered to the meshes of the wires 3 and 4, conventionally, a high-pressure water jet type wire cleaning apparatus 14,
Reference numeral 15 is installed near each of the wires 3 and 4, and cleans the wires 3 and 4 while running the wires 3 and 4. About these wire cleaning devices 14 and 15,
Referring to FIG. 6 (detailed view) and FIG. 7 (explanation of operation), as shown in FIGS. 6 and 7, a water conduit 17 provided over the entire width of the paper machine has a screw hole. A plurality of bosses 18 are provided at a predetermined pitch in the width direction of the paper machine, and a high-pressure water jet nozzle 19 is attached to each boss 18 via a screw hole. High-pressure water (also referred to as high-pressure water jet or washing water) 20 supplied from the high-pressure water jet nozzle 19 in the conduit 17 is locally jetted to wash the wires 3 and 4 contaminated with the stock.

In order to clean the entire surface of the wire 3 in the width direction with the high-pressure water jet nozzle 19, the conduit 17 to which the high-pressure water jet nozzle 19 is attached is connected to the sliding device 1.
6 allows sliding in the width direction. The high-pressure water 20 that has passed through the wires 3 and 4 is suctioned by a suction box or a suction box 21 as shown, and is discharged to the outside via a drain pipe.

[0008] Although the wire cleaning devices 14 and 15 are used to clean the wires 3 and 4 due to the paper material, as shown in FIG. In a place where the influence of the mist 22 is large, the high-pressure water jet nozzle 19 is arranged so as to inject the high-pressure water 20 to the wire 3 on the free-run, as in the wire cleaning device 14. As in the case of the wire cleaning device 15, the high-pressure water jet nozzle 19 is disposed so as to spray toward a portion where the wire 4 is wound around a roll.

[0009]

In the above-described conventional wire washing apparatus for a paper machine using a high-pressure water jet, since the high-pressure water 20 is locally jetted from the high-pressure water jet nozzle 19, the conduit 17 is slid. The device 16 is slid to clean the entire area in the width direction of the wire. However, since the sliding is performed mechanically, the movement of the nozzle 19 becomes slow near the turning point (at the turning point, the speed is reduced). 0
However, since the residence time of the nozzle 19 is longer than other parts, there is a problem that in the extreme case, the high pressure water 20 deforms the vicinity of both ends of the wires 3 and 4.

Further, since the cleaning is local, the cleaning efficiency is low.
The high-pressure water 20 that has passed through the wire 3 and 4 can be easily collected with a saury ball, a suction box 21 or the like.
The mist 22 generated by reflection on the surface cannot completely cover the mist generating portion. Therefore, although the location of the high-pressure water jet nozzle is considered depending on the degree of influence of the mist 22 as described above, it cannot be completely prevented, and the atmosphere of the former portion and its peripheral portion is moistened. In addition, the material such as fibers and filler contained in the wires 3 and 4 impregnated in the mist 22 is scattered, and the material is accumulated in the former portion and its peripheral portion.

The moistening of the atmosphere in the former and its surroundings may cause problems in the electrical system of the paper machine,
In addition, there is a possibility that rust or stains may be caused in a portion of the paper machine where no moisture control is performed, which is not preferable. In addition, if the accumulated paper stock jumps onto the wires 3 and 4, troubles such as paper breakage and paper breakage occur during the operation of the paper machine, which is a serious problem in the operation of the paper machine that is operated continuously. It has become.

Japanese Patent No. 2,874,799 describes a technique relating to a wire washing apparatus for a paper machine provided with a high-pressure air blowing nozzle. With this technology,
As shown in an enlarged sectional view of a main part in FIG. 8, the high-pressure air blowing nozzle has an upstream board 30, a downstream board 31, and a pressure pipe 32, and blows out pressurized air between the boards 30 and 31. A slit 33 is formed. The surface (the lower surface in the figure) of the upstream board 30 is a guide surface for guiding the wire 35, and the guide surface and the wire 35 form an appropriate angle with each other. Further, a wedge-shaped region 34 tapered toward the transport direction of the wire 35 is provided on the upstream side in the transport direction of the wire 35.

Further, the wedge-shaped region 34 has an injection pipe 4
From 0, a jet 41 of water is supplied directly or indirectly, and water for cleaning is supplied to the wire 35 to release dirt attached to the wire 35 and take in the cleaning water. After that, by blowing pressurized air from the blowing slit 33 toward the wire 35, the dirt attached to the wire 35 is blown off together with the washing water.

According to this technique, since both boards 30 and 31 may extend seamlessly over the entire width of the wire 35, the entire area in the width direction of the wire 35 can be simultaneously cleaned and the surface of the wire 35 can be cleaned. Since there is no bounce of the washing water, there is an effect of removing the mist, and the above problem can be solved. However, simply supplying the jet 31 of the water to the wedge-shaped region 34 does not uniformly spray the washing water into the wire 35. Wire 35
It is difficult to reliably remove stubborn dirt attached to the inside.

The present invention has been devised in view of the above-described problems, and it is possible to suppress the generation of mist due to the ejection of cleaning water and reduce the adverse effect of the generation of mist, and to achieve high cleaning efficiency and high cleaning effect. It is an object of the present invention to provide a wire washing device for a paper machine, which can be obtained.

[0016]

In order to achieve the above object, a wire cleaning apparatus for a paper machine according to the present invention (claim 1) is provided.
An apparatus for cleaning a wire provided in a paper machine,
Cleaning water spraying means for spraying the cleaning water toward the wire, a cleaning water retaining section for supplying the cleaning water to the wire after retaining the injected cleaning water near the wire, and a cleaning water retaining section for supplying the cleaning water to the wire. A pressurized air injection means is provided downstream of the wire in the traveling direction, injects pressurized air toward the wire, and removes dirt on the wire together with washing water.

Preferably, the washing water jetting means comprises three fixed blades which are arranged in parallel and close to each other so as to be perpendicular to the running direction of the conveyed wire and slidably contact the wire surface. Has a first slit formed between the two fixed blades on the upstream side in the wire running direction among the three fixed blades, and injects the washing water toward the wire, and the pressurized air jetting means includes: A second fixed blade formed between two fixed blades on the downstream side in the wire running direction of the two fixed blades and for injecting pressurized air toward the wire;
It has a slit, and the washing water retaining portion is configured to be formed in the first slit.

The washing water retaining portion is formed on the wire side of the fixed blade which forms the first slit and is located on the downstream side in the wire traveling direction, and is formed by a wall surface facing the traveling direction of the wire and the wire. The wire preferably has a recess that is separated from the ceiling surface at a required distance and extends in the width direction of the wire. Alternatively, the pressurized air injection means may include two fixed blades arranged in parallel and close to each other so as to be orthogonal to the traveling direction of the conveyed wire and slidably contact the wire surface. A slit formed between the two fixed blades for ejecting pressurized air toward the wire, wherein the washing water jetting means is disposed upstream of the two fixed blades and is used for washing water toward the wire; The washing water retaining portion is formed on the wire side of the fixed blade on the upstream side in the wire running direction of the two fixed blades, and a wall surface facing the running direction of the wire and the wire It is preferable to have a recess that is separated from the ceiling surface at a predetermined distance from the wire and that extends in the width direction of the wire.

Preferably, the length of the ceiling surface in the running direction of the wire is set within a range of 5 to 100 mm, and the distance from the ceiling surface to the wire is 1 to 10 m.
m, and more preferably, the length of the ceiling surface in the running direction of the wire is set to 30 mm, and the distance from the ceiling surface to the wire is set to 2 mm. Further, a water collecting means for collecting water removed from the wire by jetting of pressurized air by the pressurized air jetting means may be provided.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. First, a wire washing device for a paper machine as a first embodiment of the present invention will be described with reference to FIG. The wire cleaning device for a paper machine according to the present embodiment is, for example, a key portion close to a wire of a paper machine former section as shown in FIG.
15).

As shown in FIG. 1, the wire washing apparatus for a paper machine comprises a washing water supply box 51 for supplying washing water and an air supply box 55 for supplying pressurized air provided over the entire width. Is provided. Cleaning water supply box 5
1 includes a water supply passage 60 connected to the cleaning water supply source 49.
And a water distribution chamber 61 connected to the water supply passage 60 via a slit opening 56, and a slit 58 configured as an outlet of the water distribution chamber 61.

The slit 58 is formed between the fixed blade 52 and the fixed blade 53. This slit 5
Numeral 8 extends in the width direction of the wire 50, and may extend seamlessly over the entire width of the wire 50, or may have a break in the middle. That is, it may be formed of one open slit or a plurality of open slits provided over the entire width of the wire 50. Also, the slit opening 56 may be a single slit opening provided over the entire width of the wire 50 or a plurality of slit openings 56 may be provided in parallel.

A washing water injection means comprising such a washing water supply box 51 and a washing water supply source 49 is constituted, and washing water supplied from the washing water supply source 49 is supplied from the water supply passage 60 to the slit opening. The water distribution chamber 61 through the section 56
To be ejected from the slit 58 toward the wire 50. In the air supply box 55,
Air supply passage 6 connected to a pressurized air supply source (not shown)
2 and a slit-like opening 57 in the air supply passage 62.
The air distribution chamber 63 is connected to the air distribution chamber 63 via a slit 59, and a slit 59 formed as an outlet of the air distribution chamber 63 is provided.

The slit 59 is formed between the fixed blade 52 and the fixed blade 54. This slit 5
9 also extends in the width direction of the wire 50, and may extend seamlessly over the entire width of the wire 50, or may have a break in the middle. That is, it may be a single open slit provided over the entire width of the wire 50, or may be a plurality of open slits. Also, the slit opening 57 may be a single slit opening provided over the entire width of the wire 50, or a plurality of slit openings 57 may be provided in parallel. Pressurized air injection means is constituted by such an air supply box 55 and an air supply source (not shown), and pressurized air supplied to the air supply box 55 is supplied from the air distribution chamber 63 through a slit 59 through a wire 59. 50 is injected.

In the present embodiment, the fixed blade 5
For example, side plates (not shown) are attached to ends of the wires 53 in a direction perpendicular to the running direction of the wire 50 in order to prevent the fluid from flowing out from the ends of the slits 58 and 59. I have. As shown in FIG. 1, the fixed blades 52, 53, and 54 are provided with a dovetail groove having a T-shaped cross section so that they can be easily inserted and removed in the width direction of the paper machine. The distal end surfaces (lower end surfaces in FIG. 1) of the fixed blades 52, 53, and 54 have a structure in which they come into sliding contact with the wire 50. The edge 53c is preferably provided with a curved surface, for example, an R (radius) of about 2 mm to prevent wire damage. The other ends 52c and 54c that are in sliding contact with the wire 50 are also preferably provided with curved surfaces (R may be smaller than the edge 53c) in order to prevent wire damage. Further, the material of the portion that comes into sliding contact with the wire 50 is made of, for example, a wear-resistant material such as ceramic.

Further, a plurality of showers 48 are provided in the width direction near the slit 58 on the upstream side of the washing water supply box 51 in the wire running direction. This shower 48
Is connected to a cleaning water supply source 49, and sprays cleaning water in a fan shape over the entire width of the wire 50. The shower 48 is not a high-pressure shower that allows the cleaning water to pass through the wire 50, but is for forming a water film on the surface of the wire 50, and the water pressure is preferably set to a low pressure (for example, about 30 KPa or less). That is, it is set so that the mist is not generated by the reflection of the cleaning water on the wire surface.

In this embodiment, the slit 58
The opening (lower end in FIG. 1) is configured to function as the washing water retaining section 71. That is, the fixed blades 52 and 53 whose leading end surfaces are in sliding contact with the wire 50 form a narrow space partitioned in the front and rear direction of the wire.
The jetted cleaning water is allowed to stay for a very short time in the vicinity of the wire 50 at the opening of the slit 58 so that the water pressure of the cleaning water can be made uniform in the wire width direction.

A suction hood (not shown) opposes the slits 58 and 59 as a water collecting means for capturing a multi-phase flow of the air ejected through the wire 50 and the washing water supplied to the wire 50. It is provided to be. Such a suction hood can be achieved by known techniques,
The suction box 21 shown in FIG. 7 corresponds to this suction hood.

The wire washing device for a paper machine according to the present embodiment comprises:
Since the wire 50 is configured as described above, first, fan-like cleaning water is supplied from the shower 48 to the wire 50.
The cleaning water adheres to the outer peripheral surface of No. 0. When the operation is resumed after the former has stopped, the wire moisture content is initially low,
When the fixed blades 52 to 54 are brought into sliding contact with the wire 50, for example, a problem such as heat shock may be caused, which may damage the wire. In this apparatus, the cleaning water sprayed from the shower 48 is used. Since it adheres to the wire 50 before slidingly contacting the fixed blades 52 to 54 to increase the water content of the wire, it is possible to prevent a heat shock at the time of resuming operation and to protect the wire.

Thereafter, by discharging the cleaning water from the cleaning water supply source 49, the wire 50 is sprayed with a higher pressure of the cleaning water from the slit 58, and the cleaning water is pushed into the wire 50 by this high water pressure and is filled. Then, paper materials such as fibers and fillers entangled or attached to the wire 50 are taken into the washing water and released from the wire 50.
Thereafter, pressurized air is injected from the slits 59 to remove the washing water that has taken in the stock in the wire 50 from the wire 50.

That is, paper materials such as fibers and fillers entangled in the wire 50 are removed by replacing the material with clean washing water, and the traveling wire 50 is washed. By the way, the water supply passage 6 of the cleaning water supply box 51
The supply pressure of the cleaning water over the entire width of the wire 50 is uniform due to the resistance of the cleaning water supplied to the water distribution chamber 61 through the slit opening 56 provided in a part of the box. In addition to this, the cleaning water injected from the opening of the slit 58 stays for a very short time in the vicinity of the wire 50, and the supply pressure of the cleaning water becomes uniform in the wire width direction.

Therefore, the washing water supplied from the slit 58 is pushed into the wire 50 that runs at a uniform pressure in the width direction of the wire 50 while maintaining the pressure given by the washing water supply source 49. Thus, the cleaning efficiency can be improved as compared with the related art. Further, the resistance of the pressurized air supplied to the air supply passage 62 of the air supply box 55 to the air distribution chamber 63 through the slit opening 57 provided in a part of the air supply passage 62. Thereby, the supply pressure of the pressurized air over the entire width of the wire 50 is made uniform, and the supply pressure of the washing water pushed into the wire 50 is made uniform, and the wire 50
It is possible to uniformly remove the washing water containing the paper stock therein, and the washing ability is improved as compared with the conventional case.

Thus, according to the present apparatus, the cleaning ability and the cleaning efficiency of the wire 50 are improved. The multi-phase flow of the air ejected through the wire 50 and the washing water supplied to the wire 50 is captured by a suction hood (not shown) as a moisture recovery means and discharged to the outside. Since the cleaning water is pushed into the wire 50 from the slit 58 without being reflected, no mist is generated. Therefore, it is also possible to avoid adverse effects due to the generation of mist.

Next, a wire cleaning device for a paper machine according to a second embodiment of the present invention will be described with reference to FIG.
Since the wire cleaning device for a paper machine according to the present embodiment is configured in substantially the same manner as the first embodiment, the description will focus on the differences from the first embodiment. 2, the same symbols as those in FIG. 1 denote the same members, and a description thereof will be omitted.

As shown in FIG. 2, in the present embodiment, the first
The fixed blade 52 of the embodiment is replaced with a fixed blade 52 '. That is, at the tip (the lower end in FIG. 2) of the fixed blade 52 ', there is an interval δ between the wire 50 and the length a in the traveling direction of the wire 50, and thereafter, the structure comes into sliding contact with the wire 50. ing. That is, the distal end of the fixed blade 52 ′ is defined by a wall surface 52 a facing the traveling direction of the wire 50 and a ceiling surface 52 b substantially parallel to the wire 50 at a required interval δ from the wire 50. A recess 75 extending in the direction is provided. The recess 75 allows the cleaning water injected from the slit 58 to stay in the vicinity of the wire 50 for a very short time,
It functions as a washing water retaining section 72 for making the supply pressure of the washing water uniform in the width direction of the wire 50.

The length (the length of the ceiling surface 52b in the wire running direction) a is preferably within a range of 5 to 100 mm.
More preferably, it is set to approximately 30 mm. The interval (the interval from the ceiling surface 52b to the wire 50) δ is preferably in the range of 1 to 10 mm, more preferably approximately 2 mm.
mm. With such a configuration, in the present embodiment, in the cleaning water retaining section 72, the cleaning water supplied from the slit 58 to the wire 50 is supplied to the wire 50 traveling at the supply pressure given by the cleaning water supply source 49.
In addition to the same action as in the first embodiment in which the wire 50 is uniformly pushed in the width direction of the wire 50, the flow rate accelerated by the wire 50 in the recess 75 is suddenly blocked by the wall surface 52, and the flow rate is adjusted. The kinetic energy (dynamic pressure) is converted into static pressure, and the converted static pressure assists in pushing the washing water into the running wire 50. As a result, the pushing of the cleaning water into the wire 50 is further promoted, and the cleaning effect more than that of the first embodiment can be obtained. After that,
Pressurized air is injected from the slit 59, and the action of removing the paper material entangled in the wire 50 together with the washing water is the same as in the first embodiment.

Next, a wire cleaning apparatus for a paper machine according to a third embodiment of the present invention will be described with reference to FIGS. 3 and 4, the same reference numerals as those in FIGS. 1 and 2 denote the same members, and a description thereof will be omitted. As shown in FIGS. 3 and 4, the wire cleaning device for a paper machine according to the present embodiment is different from the second embodiment in that a cleaning water supply box 51, a water supply passage 60, a slit opening 56, a water distribution chamber. 61, the fixed blades 52 'and 53, and the shower 48 are removed, and the fixed blade 52 "and the shower 48' are installed.

The washing water injection means comprises a washing water supply source 49, a shower 48 'supplied with washing water from the washing water supply source 49, and a recess 76 formed by the fixed blade 52 ". As shown in FIGS. 3 and 4A, the fixed blades 52 ″, 54 extend over the entire width of the wire 50, and are fixed.
Side plates 46 are provided at both ends in the width direction (direction orthogonal to the running direction of the wire).

At the tip (the lower end in FIGS. 3 and 4) of the fixed blade 52 ″, a length a in the running direction of the wire 50 is set.
Is a distance δ from the wire 50, and thereafter, the wire 5
It has a structure in which the wire 50 is slidably in contact with the wire 50, and is defined by a wall surface 52a 'and a ceiling surface 52b' similar to those in the second embodiment, and has a recess 76 extending in the width direction of the wire 50.
The recess 76 functions as a washing water retaining section 73 described later.

The length a of the recess 76 (the length of the ceiling surface 52b 'in the wire running direction) is preferably 5 to 100 mm.
Is more preferably about 30 mm. Also, the interval (the distance from the ceiling surface 53b to the wire 50) δ
Is preferably set in the range of 1 to 10 mm, more preferably about 2 mm. A plurality of showers 48 ′ are provided in the width direction of the wire 50 on the upstream side of the fixed blade 52 ″ in the wire running direction and connected to the washing water supply source 49,
The cleaning water is sprayed in a fan shape over the entire width of the wire 50. The shower 48 ′ is not a high-pressure shower for allowing the cleaning water to penetrate the wire 50, but is for filling the cleaning water into the wire 50 or forming a water film on the surface of the wire 50. (For example, about 30 KPa)
Is preferably set to. That is, the setting is made so that the mist is not generated by the reflection of the cleaning water on the wire surface.

With this configuration, in the present embodiment, in the process in which the water film of the cleaning water formed on the surface of the wire 50 from the shower 48 ′ is accelerated by the wire 50, the inside of the recess 76 (the cleaning water retaining portion) is formed. 73), the kinetic energy (dynamic pressure) corresponding to the accelerated flow velocity of the water film is converted to static pressure, and the water film ( Cleaning water) is pushed into the wire 50. Thereafter, pressurized air is injected from the slit 59, and the action of removing the paper material entangled in the wire 50 together with the washing water is the same as in the first and second embodiments.

As a result, with a simpler configuration, the second
As in the embodiment, it is possible to promote the pushing of the cleaning water into the wire 50. As described above, three embodiments of the wire cleaning device for a paper machine of the present invention have been described. However, the present invention is not limited to these embodiments, and variously modified and implemented without departing from the gist of the present invention. be able to.

For example, in the first and second embodiments described above,
Before the wire 50 comes into sliding contact with the fixed blades 52 to 54, washing water is supplied from the shower 48 to the surface of the wire 50 to increase the water content of the wire, thereby preventing heat shock at the time of restarting operation. If the effect of the heat shock is small, for example, the wire can withstand sufficiently, the shower 48 may be omitted.

It is also conceivable to add a recess 76 having a wall surface 52a 'to the fixed blade 53 of the first and second embodiments, like the fixed blade 52 "of the third embodiment.

[0045]

As described above, according to the wire washing apparatus for a paper machine of the present invention (claim 1), when the washing water is jetted toward the wire by the washing water jetting means, the water pressure of the washing water is increased. The dirt attached to the wire can be dissociated from the wire, and immediately thereafter, the dirt dissociated from the wire by the pressurized air ejected by the pressurized air jetting means is separated from the wire together with the washing water in the wire,
Cleaning can be performed simultaneously in the wire width direction, and cleaning water can be removed from the wire together with dirt by pressurized air. In particular, the cleaning water injected from the cleaning water injection unit is supplied to the wire after being retained in the vicinity of the wire by the cleaning water retaining unit. The water pressure becomes uniform in the wire width direction, and the cleaning performance and cleaning efficiency are improved.

Further, the washing water jetting means is provided with a first slit formed between the two fixed blades for jetting the washing water pressurized toward the wire, and the washing water retaining portion is formed by the first slit. With this configuration, the above-described effect can be reliably obtained with a simpler configuration. Further, the washing water retaining portion is configured so as to be provided with a recess that is defined by a wall surface facing the traveling direction of the wire and a ceiling surface separated by a required distance from the wire and extends in the width direction of the wire. This allows the cleaning water to stay in the vicinity of the wire for a very short period of time, thereby making it possible to more evenly maintain the water pressure of the cleaning water in the wire width direction. Energy (dynamic pressure) is converted to static pressure, and the cleaning water is pushed more strongly into the wire, thereby improving cleaning performance (claims 3 and 4).

In this case, the length of the ceiling surface in the running direction of the wire is in the range of 5 to 100 mm, preferably 30 mm.
And the distance from the ceiling surface to the wire is 1 to 10
If it is set within the range of 2 mm, preferably 2 mm, it becomes easy to secure the water pressure of the washing water and to make it uniform in the wire width direction. Further, the provision of the water collecting means can more reliably suppress the generation of the mist of the cleaning water (claim 6).

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a main part of a wire cleaning device for a paper machine according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a main part of a wire cleaning device for a paper machine according to a second embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a main part showing a wire cleaning device for a paper machine according to a third embodiment of the present invention.

FIG. 4 is a schematic view showing a paper machine wire cleaning apparatus according to a third embodiment of the present invention, wherein FIG. 4 (a) is a front view of a main part viewed from an upstream side in a wire running direction [(b); A view in the direction of arrow A], and (b) is a side view of the main part thereof (a view in the direction of arrow B in (a)).

FIG. 5 is a schematic side view showing a paper machine former unit.

FIG. 6 is a front view of a conventional wire washing device for a paper machine as viewed from a wire running direction.

FIG. 7 is an enlarged view of a main part of the conventional wire cleaning device for a paper machine shown in FIG. 6, viewed from the side, and illustrating its operation.

FIG. 8 is an enlarged sectional view of a main part showing a conventional technique (Japanese Patent No. 2874799).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head box 2 Paper raw material liquid 3 Top wire 4 Bottom wire 5 1st dehydrator 6 2nd dehydrator 7 3rd dehydrator 8 Couch roll 9 Transfer box 10 Forming roll 11 Breast roll 12 Return roll 13 Wire turning roll 14,15 High pressure Jet-type wire cleaning device 17 Conduit 18 Boss part 19 High-pressure water jet nozzle 20 High-pressure water 21 Suction box 46 Side plate 47,48 Shower 49 Cleaning water supply source 50 Wire 51 Cleaning water supply box 52,52 ', 52 ", 53,54 Fixed blades 52a, 52a 'Wall surfaces 52b, 52b' Ceiling surfaces 52c, 53c, 54c Edges 55 Air supply boxes 56, 57 Openings 58, 59 Slits 60 Water supply passage 61 Water distribution chamber 62 Air supply passage 63 Air distribution chamber 64 Surface 71, 72 and 73 the washing water retention portion 75 recess

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) D21F 1/34 D21F 1/34 F term (reference) 3B116 AA07 AA47 AB53 BB03 BB32 BB62 CC03 CD22 3B201 AA07 AB53 BB05 BB22 BB32 BB62 BB92 CC12 CD22 4L055 CG22 CG23 FA08 FA22

Claims (6)

[Claims] An apparatus for washing a wire provided in a paper machine, comprising: a washing water jetting unit for jetting washing water toward the wire; and the jetted washing water staying near the wire. rear,
A washing water stagnation section for supplying the wire, and a pressurized air disposed at a downstream side of the washing water stagnation section in the running direction of the wire for injecting pressurized air toward the wire to remove dirt on the wire together with the washing water. A wire cleaning device for a paper machine, comprising a pressurized air injection means. 2. A cleaning water injection means, comprising: three fixed blades arranged in parallel and close to each other so as to be perpendicular to the traveling direction of the conveyed wire and to be in sliding contact with the surface of the wire. A first slit formed between the two fixed blades on the upstream side in the wire running direction among the three fixed blades to inject cleaning water toward the wire; A second slit formed between the two fixed blades on the downstream side in the wire running direction among the fixed blades for ejecting pressurized air toward the wire; and the washing water retaining portion is provided in the first slit. The wire cleaning device for a paper machine according to claim 1, wherein the wire cleaning device is formed. 3. The washing water retaining portion is formed on the wire side of the fixed blade, which forms the first slit and is located downstream in the wire traveling direction, and includes a wall surface facing the traveling direction of the wire and the wire. 3. The wire washing device for a paper machine according to claim 2, wherein the wire washing device for a paper machine is provided with a recess which is separated from a ceiling surface at a required distance and extends in the width direction of the wire. 4. A pressurized air injection means, comprising: two fixed blades arranged in parallel and close to each other so as to be orthogonal to the running direction of the conveyed wire and to slide on the wire surface. Has a slit formed between the two fixed blades and ejecting pressurized air toward the wire, wherein the washing water jetting means is disposed on the upstream side of the two fixed blades, and And a washing water retaining portion formed on the wire side of the fixed blade on the upstream side in the wire running direction of the two fixed blades, the wall surface facing the running direction of the wire. The wire cleaning apparatus for a paper machine according to claim 1, characterized in that the wire cleaning apparatus is provided with a recess which is defined by a ceiling surface separated by a predetermined distance from the wire and extends in a width direction of the wire. . 5. The traveling direction length of the wire on the ceiling surface is:
Within the range of 5 to 100 mm, preferably set to 30 mm, the distance from the ceiling surface to the wire is 1 to 10 mm
5. The wire cleaning device for a paper machine according to claim 3, wherein the wire cleaning device is set within a range of, preferably, 2 mm. 6. A water recovery means for recovering water removed from the wire by the injection of pressurized air by the pressurized air injection means is provided.
Item 6. The wire cleaning device for a paper machine according to any one of Items 5 to 5.