JP2003096584A - Spray apparatus for cleaning metallic web and cleaning method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To homogeneously clean a metallic web over the whole width by a thin film curtain-like water jet, and to prevent the reduction of the cleaning performance causing the unevenness of cleaning on the metallic web, over a long period. SOLUTION: In a cleaning tank 14, at first, a water jet formed by an overflow type spray apparatus 18 is poured on the surface of an aluminum web 12 where an etching solution is stuck, and, the surface of the aluminum web 12 is subjected to cleaning (initial cleaning). At this time, by a spray apparatus 18, cleaning water is controlled to a thin film curtain-like water jet wider than the aluminum web 12, and this water jet is poured over the whole width of the aluminum web 12. Thus, the surface of the aluminum web 12 can homogeneously be cleaned over the whole width without waste, so that the etching solution remaining on the surface of the surface of the aluminum web 12 after the initial cleaning is diluted to a sufficiently low concentration, and, further, the difference in the concentration of the etching solution over the whole of the surface of the aluminum web 12 can sufficiently be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a metal web processing facility or the like for performing various surface treatments such as etching on a long strip-shaped metal web, and the long strip-shaped metal web to which foreign matters such as an etching solution adhere. The present invention relates to a metal web cleaning device for cleaning a metal web with cleaning water and a method for cleaning a metal web using the cleaning spray device.

[0002]

2. Description of the Related Art The support for a lithographic printing plate is generally made of a long strip of aluminum web rolled from aluminum or an aluminum-based alloy, and the surface of the aluminum web is anodized and etched. Various surface treatments such as treatments and mechanical surface roughening treatments are applied to manufacture. Therefore, a plurality of surface treatment devices for performing various surface treatments on the aluminum web are installed in the lithographic printing plate production line.

FIG. 5 shows the configuration of an etching treatment apparatus as an example of an aluminum web surface treatment apparatus.
This etching processing apparatus 100 includes an etching tank 104 for causing an etching solution to adhere to a long strip of aluminum web 12 to cause an alkaline etching reaction, and
A cleaning tank 106 for cleaning and removing the etching solution adhering to the aluminum web is provided. In the etching tank 104 and the cleaning tank 106, a plurality of pass rolls 108 are arranged along a predetermined transport path, and these pass rolls 108 are arranged along the transport path.
The aluminum web 12 is continuously conveyed from the etching tank 104 to the cleaning tank 106 while the 2 is stretched.

In the etching bath 104, the pass roll 1
A plurality of spray devices 110 are arranged so as to face the front and back surfaces of the aluminum web 12 stretched by 08, and these spray devices 110 spray an etching solution on the front and back surfaces of the aluminum web 12, respectively.
The etching solution is evenly attached to the front and back surfaces of the aluminum web 12. As a result, the alkali etching reaction is started on the front and back surfaces of the aluminum web 12. Here, the spray device 110 may be either a nozzle spray device that sprays the etching solution as a water droplet flow or a slit spray device that sprays the etching solution as a thin film curtain-shaped water flow.

The pass roll 10 is also provided in the cleaning tank 106.
A plurality of spraying devices 112, 114 are provided so as to face the front and back surfaces of the aluminum web 12 stretched by 8 respectively.
Is provided. Here, these spray devices 11
A slit type spray device is used as the spray device 112 arranged on the most upstream side of 2, 114 and facing the surface of the aluminum web 12, and a nozzle type spray is used as the other spray device 114 except this spray device 112. The device is being used. Aluminum web 1
The surface 2 refers to one surface along the thickness direction in which the photosensitive layer is applied and formed when the planographic printing plate having the aluminum web 12 as a support is a single-sided product.

The slit type spray device 110 is shown in FIG.
As shown in FIG. 1, a frame portion 116 connected and fixed to the structural portion of the cleaning tank 106 is provided.
A tank portion 120 for storing the washing water is provided on the lower side of 16. In addition, the spray device 112 includes a tank unit 1
A water supply nozzle 118 for supplying cleaning water is provided in the inside of the tank 20. The water supply nozzle 118 is connected to a water supply facility (not shown) outside the cleaning tank 106 through a pipe 119, and inside the tank portion 120. Pressurized cleaning water is supplied through the water supply nozzle 118.

An elongated slit opening 122 is provided at the lower end of the tank portion 120 along the width direction of the aluminum web 12. This slit opening 122 is used for the aluminum web 12
Of the straightening vanes 124 and L, which are flat when viewed from the outside in the width direction of the
It is formed between the open / close plate 126 and the plate end portion which is bent in a letter shape. Here, the opening / closing plate 126 is supported by the width adjusting mechanism 128 so as to be able to come into contact with and separate from the straightening plate 124, and the adjusting screw 130 of the width adjusting mechanism 128 is rotated to bring the opening / closing plate 126 into contact with and separating from the straightening plate 124. And slit mouth 1
The slit width along the lateral direction of 22 is adjustable. The slit width is adjusted to a narrow width of about 0.7 mm, for example. Further, the slit length along the longitudinal direction of the slit port 122 is wider than the entire width of the aluminum web 12. In this spraying device 112, when pressurized cleaning water is supplied into the tank portion 120 through the water supply nozzle 118, it becomes a thin film curtain-shaped water flow spreading along the width direction of the aluminum web 12, and from the slit port 122. The water stream is jetted onto the surface of the aluminum web 12 and is made to flow over the entire width of the aluminum web 12. As a result, immediately after being discharged from the etching tank 104,
The aluminum web 12 is initially cleaned by the flow of cleaning water.

On the other hand, the nozzle type spray device 114 has a nozzle portion (not shown) facing the aluminum web 12.
This spray device 114 is provided with cleaning water in a pressurized state by a water supply facility arranged outside the cleaning tank 106, and supplies this cleaning water from the nozzle portion in the width direction and the longitudinal direction of the aluminum web 12. Aluminum web 1 as a water droplet stream or a stream having a predetermined spread angle along each direction
2, and the surface of the aluminum web 12 is cleaned.

In the cleaning tank 106 as described above, first,
By uniformly cleaning the aluminum web 12 along the width direction with a thin film curtain-shaped water flow formed by the spray device 112 arranged on the most upstream side, the etching solution adhering to the aluminum web 12 is evenly washed away. At the same time, the residual etching solution on the aluminum web 12 is sufficiently diluted to stop the etching reaction or sufficiently suppress the etching reaction. Next, in the cleaning tank 106, a plurality of spray devices 114, which are arranged on the downstream side of the spray device 112, spray a water droplet stream onto the aluminum web 12, and the etching solution is washed away from the surface of the aluminum web 12 by these water droplet streams.

[0010]

By the way, when the aluminum web 12 is cleaned in the cleaning tank 106 as described above, the aluminum web 12 is moved in the width direction by the water flow from the slit type spray device 112 arranged on the most upstream side. If not uniformly washed along the surface of the aluminum web 12, the entire surface of the aluminum web 12 may not be uniformly etched, and the etching strength on the surface of the aluminum web 12 may become partially uneven. Such an aluminum web 12 has uneven surface quality.

That is, the slit type spray device 11
In No. 2, since the slit width of the slit opening 122 formed between the rectifying plate 124 and the opening / closing plate 126 is very narrow, foreign matter such as scale is likely to be clogged in the slit opening 122, and the foreign matter is clogged in the slit opening 122. In such a case, the water amount distribution along the width direction of the water flow jetted from the slit port 122 becomes uneven, and in the worst case, the slit port 12
The washing water is no longer sprayed at the portion corresponding to the foreign matter of No. 2. Therefore, when the slit port 122 is clogged with foreign matter, the initial cleaning of the portion of the aluminum web 12 corresponding to the foreign matter is insufficient, and uneven etching of the aluminum web 12 easily occurs.

In the lithographic printing plate production line, as a measure for improving the unevenness of etching of the aluminum web 12, for example, maintenance of the spray device 112 such as cleaning of the slit port 122 is regularly performed, and the water quality of the washing water is controlled. However, even if such various measures are taken, it is not possible to completely prevent clogging of the slit port 122 caused by a sudden factor such as scale peeling in the cleaning water supply pipe. Can not. Also spray device 11
It is necessary to set the maintenance cycle to a sufficiently short period to maintain 2 in a good state.
Maintenance work for is complicated. Furthermore, in the planographic printing plate production line, it is desirable to operate continuously without stopping the line from the viewpoint of productivity,
In practice, there is also a problem that the spray device 112 cannot be maintained in a sufficiently short cycle.

In the slit type spray device 112, unless the amount of washing water supplied from the inside of the tank portion 120 to the slit port 122 is set to a high amount to some extent,
It has a characteristic that it is difficult to stably obtain a water flow having a uniform water amount distribution along the width direction. Therefore, there is also a problem that the amount of cleaning water consumed by cleaning the aluminum web 12 in the cleaning tank 106 increases.

In view of the above facts, an object of the present invention is to wash a metal web uniformly over the entire width with a thin film curtain-like water flow, and to wash the metal web without special maintenance. It is an object of the present invention to provide a spray device for cleaning a metal web, which can prevent deterioration of cleaning ability that causes unevenness for a long time.

Another object of the present invention is, in consideration of the above facts, to provide a method for cleaning a metal web, which can efficiently clean the metal web with a small amount of water so as to prevent uneven cleaning of the metal web. To do.

[0016]

In the spray device for cleaning a metal web according to the present invention, water is stored so that the base end portion of the straightening plate which is curved downward in a substantially U shape and is immersed in the cleaning water. Along with being attached to the overflow part of the tank, this straightening plate is formed with a straightening surface for directing the metal web from the base end part to the front end part. The water flow is rectified into a wide film curtain-shaped water flow, and the water flow is dropped from the tip of the rectification surface toward the metal web. This makes it possible to wash the surface of the metal web evenly over the entire width by exposing the metal web to a thin film curtain-shaped water stream that is wider than the metal web. It is possible to effectively suppress the occurrence of the difference in the density of foreign matters and the like and the unevenness in the adhered amount due to

Further, in the cleaning spray device of the present invention,
It is a structure that rectifies the wash water that overflows from the water storage tank into a thin film curtain-shaped water flow by the rectification surface formed on the rectification plate, and drops this water flow from the rectification surface onto the metal web. Since there is no restriction opening such as a slit port for squeezing and rectifying the pressurized wash water, clogging of foreign matter in the device causes uneven water flow distribution along the width direction of the metal web. There is no. Therefore, even if special maintenance such as cleaning of the slit opening is not performed, it is possible to prevent a decrease in cleaning ability that causes uneven cleaning of the metal web for a long period of time.

According to the method of cleaning a metal web of the present invention, first, the long strip-shaped metal web is made to travel along a predetermined traveling path, and is arranged at the most upstream side along the traveling path. A thin film curtain-like water stream is formed by the cleaning spray device of the present invention, and by cleaning the metal web with this water stream, the surface of the metal web is spread over the entire width by the thin film curtain-like water stream that is wider than the metal web. Since the metal web can be evenly and uniformly cleaned, when the metal web passes the cleaning position by the spraying device of the present invention, the amount of foreign matter adhered to the entire surface of the metal web can be reduced evenly and sufficiently. The cleaning water is sprayed from the nozzle opening onto the metal web as a water droplet stream or a water stream by a plurality of spray devices arranged from the second upstream side along the path. As a result, the water droplet flow moving at a sufficiently high speed or the kinetic energy of the water flow acts on the foreign matter remaining on the surface of the metal web, so that the water droplet flow or the foreign matter adhering to the area directly exposed to the water stream can be effectively removed. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A spraying apparatus for cleaning a metal web according to an embodiment of the present invention and a method for cleaning a metal web using this spraying apparatus will be described below with reference to the drawings.

(Structure of Embodiment) FIG. 1 shows an etching apparatus for an aluminum web to which a spray apparatus according to an embodiment of the present invention is applied. The etching processing apparatus 10 is an etching processing apparatus 100 shown in FIG.
Similar to the above, the long strip-shaped aluminum web 12 is continuously alkali-etched. The etching tank of the etching processing apparatus 10 basically has the same configuration and operation as the etching tank 104 of the etching processing apparatus 100 shown in FIG. The same reference numeral as 5 is assigned and the description is omitted.

The etching processing apparatus 10 is provided with a cleaning tank 14 on the downstream side of the etching tank 104 along the conveyance path of the aluminum web 12, and these etching tanks 104 are provided.
Further, a plurality of pass rolls 16 are arranged in the cleaning tank 14 along a predetermined transport path, and these pass rolls 16 stretch the aluminum web 12 along the transport path while preserving the aluminum web 12 in a predetermined manner. It is continuously transported from the etching bath 104 to the cleaning bath 14 at the transport speed of.

In the cleaning tank 14, a plurality of spray devices 18 and 20 are arranged so as to face the front and back surfaces of the aluminum web 12 stretched by a pass roll 16. Here, as the spray device 18 arranged on the most upstream side of these spray devices 18, 20 and facing the surface of the aluminum web 12, the overflow type spray device according to the present embodiment (see FIG. 2) is used. Other spray device 18 except this spray device 18
A known nozzle type spray device (see FIG. 4) is used as

As shown in FIG. 2, the overflow type spray device 18 is provided with a water storage tank 24 connected to a frame portion 22 provided in the cleaning tank 14, and the water storage tank 24 is made of a stainless plate or the like. It is composed of a metal plate, and is formed in an elongated gutter shape in the web width direction (front-back direction of the paper in FIG. 2) and opens toward the upper surface side. Here, the water storage tank 24 has a dimension along the longitudinal direction (web width direction) that is sufficiently longer than the maximum width (about 1500 mm) of the aluminum web 12.

At the opening end on the upper side of the water storage tank 24, an overflow portion 26 which is lower than the other portions is provided at the front portion facing the aluminum web 12, and the cleaning water supplied into the water storage tank 24 is provided. When the water level becomes higher than the predetermined overflow water level H _F , the wash water in the water storage tank 24 preferentially flows out to the outside through the overflow section 26. A holder member 28 having a substantially U-shaped cross section is fixed to the overflow portion 26, and a slit-shaped fitting hole 30 is formed on the upper end surface of the holder member 28.
Is open.

At the overflow portion 26 of the water storage tank 24, a thin plate-shaped straightening plate 3 is provided via a holder member 28.
2 is attached. The current plate 32 is formed by bending a substantially rectangular stainless plate into a substantially U shape along the lateral direction. One end side of the straightening vane 32 along the lateral direction is fitted into the fitting hole 30 of the holder member 28, whereby the straightening vane 32 is attached to the overflow portion 26 via the holder member 28. It is attached so as to be held, and extends from the overflow portion 26 toward the aluminum web 12 side. Here, the current plate 32 is inserted into the fitting hole 30.
The part that projects from the inside and extends to the aluminum web 12 side is a rectifying part 34 for rectifying the cleaning water.

In the water storage tank 24, as shown in FIG. 2, a cylindrical water supply cylinder 36 is arranged so as to extend along the web width direction. A plurality of water supply holes 38 are formed in the peripheral wall of the water supply cylinder 36, and a water supply pipe 40 is connected to one end face portion along the axial direction thereof. Through the water supply pipe 40, the water supply pipe 36 is connected to the cleaning tank 1
4 is connected to a water supply facility (not shown) installed outside. This water supply facility is used for cleaning the aluminum web 12.
The pressurized wash water is supplied to the water supply pipe 36 through the water supply pipe 40. As a result, the water supply cylinder 36 jets and supplies the wash water into the water storage tank 24 through the water supply hole 38. Further, in the water storage tank 24, a gutter-shaped diffusing member 42 is arranged on the outer peripheral side of the water supply cylinder 36, and this diffusing member 42 is open toward the rear side opposite to the overflow portion 26. In the water storage tank 24, the water flow of the wash water injected from the water supply hole 38 of the water supply cylinder 36 collides with the inner wall surface of the diffusion member 42 except for the water flow injected rearward to be turbulent.
As a result, the surface of the wash water stored in the water storage tank 24 is prevented from locally rising or a water flow flowing in a specific direction near the water surface is prevented.

As shown in FIG. 2, the water storage tank 24 is connected to the frame portion 22 of the cleaning tank 14 via a position adjusting mechanism 44 and an angle adjusting mechanism 52. Here, the position adjusting mechanism 44 supports a movable bracket 46, which is connected and fixed to the bottom plate portion of the water storage tank 24, slidably along the web width direction and the front-rear direction (arrow FR direction). A pair of position adjusting screws 48 and 50 are connected to the movable bracket 46,
The position can be adjusted along the web width direction by rotating one of the position adjusting screws 48, and the position can be adjusted along the front-rear direction by rotating the other position adjusting screw 50.

The angle adjusting mechanism 52 is used for the water storage tank 24.
Is provided with a hinge portion 54 for rotatably connecting the frame portion 22 to the frame portion 22. The hinge portion 54 has its pivot end connected and fixed to the rear plate portion of the water storage tank 24 opposite to the overflow portion 26. At this time, the water storage tank 24
The axis S of the hinge portion 54, which is the center of rotation of, is parallel to the web width direction. The angle adjusting mechanism 52 is provided with a lock screw 56 on the lower side of the hinge portion 54. By rotating the lock screw 56 in the releasing direction to loosen it, the water storage tank 24 becomes rotatable about the axis S. Further, by rotating the lock screw 56 in the fastening direction and tightening the lock screw 56, the rotation of the water storage tank 24 about the axis S is restricted.

Next, the shape, size and the like of the current plate 32 attached to the water storage tank 24 will be described in detail with reference to FIG. As described above, the straightening vane 32 is formed by bending a substantially rectangular stainless plate into a substantially U shape along the lateral direction. Here, the rectifying unit 34 in the rectifying plate 32
V-shaped groove portions 60 are formed at both ends of the upper surface of the aluminum plate so as to extend in the lateral direction, and the distance L ₁ between the pair of groove portions 60 in the longitudinal direction is equal to 100 more than the maximum width of the web 12 (about 1500 mm)
It is 1620 mm which is long by about mm. Also, the groove 60
Are continuously formed from a site slightly above the holder member 28 to a site about 20 mm before the tip of the current plate 32. On the upper surface portion of the rectifying portion 34, the pair of groove portions 6
A region inside 0 is defined as a rectifying surface 62, and the wash water flowing out of the water storage tank 24 through the overflow portion 26 flows on the rectifying surface 62. At this time, the pair of grooves 60 restricts the washing water from flowing out from the straightening surface 62 to the side. The position of the rectifying plate 32 is adjusted in advance by the position adjusting mechanism 44 so that the center in the longitudinal direction thereof coincides with the center in the width direction of the aluminum web 12.

The rectifying surface 62 is mechanically or chemically roughened so that its surface roughness Ra (arithmetic mean roughness) falls within the range of 0.3 μm to 10 μm. This is because, in general, when a metal material such as stainless steel has a sufficiently smooth surface, it has a strong property of repelling water (wettability), so that the wash water flowing on the rectifying surface 62 is locally rectified. Face 6
This is to prevent the wash water from being evenly flowed on the rectifying surface 62 due to being repelled by 2. Further, the tip end portion of the rectifying portion 34 is formed in a slope shape having an inclination angle of about 30 ° so that the lower surface side becomes thinner from the base end side toward the tip end side. Specifically, the rectification unit 34 is
The wall thickness at the tip is reduced to about 0.5 mm. As a result, the drainage of the wash water that drops from the flow straightening surface 62 is improved, and the flow of the wash water straightened by the flow straightening surface 62 (wash water flow) is prevented from being disturbed.

A curved region 64 curved at a predetermined radius of curvature R ₁ is formed on the upper side of the rectifying surface 62, and the rectifying surface 62 has a flat inclined region on the tip side of the curved region 64. 66 is formed. Here, the apex P _T of the curved region 64 coincides with the overflow water level H _F in the vertical direction (direction of arrow UD in FIG. 2). Further, the surface of the aluminum web 12 exists on the extension line of the inclined region 66. In the present embodiment, the radius of curvature R ₁ of the curved region 64 is 60 mm, and the height difference G ₁ between the apex P _T of the curved region 64 and the tip of the inclined region 66 is 50 mm, and the inclined region 66 with respect to the horizontal direction. The tilt angle θ ₁ is set to 70 °.

The radius of curvature R ₁ is 10 mm.
It is preferable to set within the range of up to 100 mm, and by setting the radius of curvature R ₁ within this range, the water storage tank 2
When a relatively small change in the water level occurs in 4, the change in the outflow amount of the wash water from the overflow portion 26 can be moderated. The height difference G ₁ between the top P _T and the tip of the inclined region 66 is preferably set within the range of 20 mm to 120 mm, and in addition, the inclination angle θ ₁ of the inclined region 66 with respect to the horizontal direction is 30 °. It is preferable to set it within the range of 90 °. As a result, the flow velocity of the cleaning water flowing between the top portion P _T and the tip of the rectifying surface 62 becomes excessively high, and the turbulence of the cleaning water flow falling from the tip of the rectifying surface 62 (turbulence) is suppressed. It In particular, when the inclination angle θ ₁ of the inclined region 66 is set within the range of 60 ° to 70 °, even if the outflow amount of the wash water from the water storage tank 24 is at least large, it is effective to make the wash water flow turbulent. Can be suppressed to.

In the spray device 18, when the water level of the wash water in the water storage tank 24 becomes higher than the overflow water level H _F , the wash water in the water storage tank 24 flows out through the overflow portion 26. The cleaning water flows on the straightening surface 62 and drops from the tip of the straightening surface 62 onto the surface of the aluminum web 12. At this time, the rectifying surface 62 becomes the water storage tank 2
The flush water flowing out from the inside of the No. 4 and flowing toward the tip side is rectified so as to have a water flow of substantially the same width as the width of the rectifying surface 62, and the flush water has a substantially constant thickness. The thin film curtain-shaped water flow is dropped from the tip of the rectifying surface 62 onto the aluminum web 12. Here, since the width of the straightening surface 62 is wider than the maximum width of the aluminum web 12, the width of the water stream falling from the straightening surface 62 is also wider than the maximum width of the aluminum web 12. For this reason, the thin film curtain-shaped water flow falling from the rectifying surface 62 is applied over the entire width of the aluminum web 12.

Further, in the spray device 18, as the supply amount of washing water from the water supply facility increases, the water storage tank 24
The internal water level tends to rise above the overflow water level H _F. The outflow amount of wash water from the water storage tank 24 is naturally equal to the supply amount of wash water from the water supply facility. In the present embodiment, the amount of wash water supplied from the water supply facility to the spray device 18 is adjusted so that the water level in the water storage tank 24 is maintained at a level higher than the overflow water level H _F by about 5 mm. Specifically, the amount of washing water supplied from the water supply equipment to the spray device 18 is set to 40 l / min or more.

Next, the overflow type spray device 1
Nozzle type spraying device 20 arranged on the downstream side of No. 8 will be described with reference to FIG. As shown in FIG. 4 (A), the nozzle type spray device 20 includes an elongated cylindrical water supply pipe 70.
Through a bracket (not shown) so that its longitudinal direction is parallel to the width direction of the aluminum web 12.
4 frame portions 22 (see FIG. 2). One end face of the water supply pipe 70 along the longitudinal direction is closed by a blind plate 72, and the other end is opened as a water supply port 74. A water supply facility (not shown) disposed outside the cleaning tank 14 is connected to the water supply port 74 through a water supply pipe (not shown) composed of a pressure-resistant hose, a pipe, etc., and the water supply pipe 70 is connected by this water supply facility. Pressurized washing water is supplied into the inside.

The total length of the water supply pipe 70 is slightly longer than the maximum width of the aluminum web 12, and a plurality of wide-angle nozzles 76 are attached to the outer peripheral side of the water supply pipe 70. In these wide-angle nozzles 76, the nozzle openings that open at the tip end face the aluminum web 12, and the pitches P ₁ along the longitudinal direction are at equal intervals (in the present embodiment,
(150 mm pitch). When the cleaning water in a pressurized state is supplied to the water supply pipe 70, the wide-angle nozzle 76 diffuses the cleaning water into fine water droplets, and the water droplets are provided in predetermined directions along the width direction and the longitudinal direction of the aluminum web 12. Is sprayed onto the aluminum web 12 as a water droplet flow having a divergence angle (about 45 ° in this embodiment) to clean the aluminum web 12.

Further, the overflow type spray device 1
On the downstream side of 8, the nozzle type spraying device 20 shown in FIG. 4 (A) is replaced with a nozzle type spraying device 80 shown in FIG. 4 (B) instead of part or all of the nozzle type spraying device 20. Is also good. This spray device 80 is also the spray device 20.
Similarly to the above, a water supply pipe 70 to which pressurized water is supplied from a water supply facility outside the cleaning tank 106 is provided, and the water supply pipe 70 is provided with a plurality of water supply pipes 70 facing the aluminum web 12. Nozzle holes 78 are bored, and these nozzle holes 78 have equal pitches P ₂ along the longitudinal direction of the water supply pipe 70 (in the present embodiment, 15 mm).
Pitch) is arranged. These nozzle holes 78 have a substantially circular cross section and an inner diameter of about 2 mm.
It has become.

When the cleaning water in a pressurized state is supplied to the water supply pipe 70, the spray device 80 sprays this cleaning water from the nozzle hole 78 onto the aluminum web 12 to clean the surface of the aluminum web 12. . At this time, the nozzle hole 7
Although the water flow jetted from 8 spreads in the width direction and the longitudinal direction of the aluminum web 12, the spread angle of the water flow is usually considerably smaller than that of the water drop flow jetted from the wide-angle nozzle 76. There is. From this, in the spray device 80, the pitch between the nozzle holes 78 is sufficiently shorter than the pitch between the wide-angle nozzles 76 in the spray device 20, and thus, the spray device 20.
The water amount distribution of the wash water sprayed from the water is made uniform along the web width direction.

(Operation of Embodiment) Next, the operation of the etching processing apparatus 10 to which the spray device 18 according to the present embodiment having the above-described structure is applied will be described. In the etching processing apparatus 10, the aluminum web 12 carried into the etching tank 104 is stretched by a pass roll 16 and is moved in the etching tank 104 at a predetermined transport speed. At this time, the spray device 110 arranged along the conveyance path of the aluminum web 12 is
An alkali etching solution in which caustic soda, caustic potash, sodium metasilicate, etc. are dissolved is sprayed onto the front and back surfaces of No. 2, and the etching solution is evenly attached to the front and back surfaces of the aluminum web 12. As a result, the alkali etching reaction is started on the front and back surfaces of the aluminum web 12. The aluminum web 12 to which the alkaline etching solution is attached is carried out from the etching tank 104 into the cleaning tank 14 by the pass roll 16.

In the cleaning tank 14, first, the surface of the aluminum web 12 on which the etching solution is adhered is exposed to the water flow formed by the overflow type spray device 18, and the surface of the aluminum web 12 is cleaned by this water flow (initial cleaning). To do. At this time, the spray device 18 rectifies the cleaning water into a thin-film curtain-shaped water flow having a width wider than that of the aluminum web 12, and the water flow is poured over the entire width of the aluminum web 12. As a result, the surface of the aluminum web 12 can be uniformly cleaned over the entire width, so that the etching solution remaining on the surface of the aluminum web 12 after the initial cleaning is diluted to a sufficiently low concentration, and the entire surface of the aluminum web 12 is also cleaned. It is possible to sufficiently reduce the difference in concentration of the etching solution. As a result, even after the initial cleaning, it is possible to prevent uneven etching of the surface of the aluminum web 12 due to uneven cleaning of the surface of the aluminum web 12, resulting in uneven etching of the surface of the aluminum web 12.

An overflow type spray device 18
In the structure, the wash water overflowing from the water storage tank 24 is rectified into a thin film curtain-shaped water flow by the rectification surface 62 formed on the rectification plate 32, and this water flow is dropped from the rectification surface 62 onto the aluminum web 12. Unlike the slit type spray device, since there is no restricting opening such as a slit port for squeezing and rectifying the wash water in a pressurized state, clogging of foreign matter in the device causes the water flow distribution of the width of the aluminum web 12 to be wide. There is no unevenness along the direction. Therefore, in the spraying device 18, the aluminum web 1
It is possible to prevent the deterioration of the cleaning ability that causes the cleaning unevenness in 2 for a long period of time.

Next, in the cleaning tank 14, after completion of the initial cleaning, the cleaning water is made into a water droplet flow by a plurality of nozzle type spray devices 20 or spray devices 80 and the aluminum web 12 is discharged.
Jet to. At this time, since the water droplet streams ejected from the spray devices 20, 80 move at a sufficiently high speed,
The kinetic energy of the water droplet flow is made to act on the low-concentration etching solution remaining on the surface of the aluminum web 12, and the etching solution adhering to the vicinity of the area directly exposed to this water droplet flow can be effectively removed. At this time, one spray device 2
Even if the flow rate distribution of the water droplets jetted from the nozzles 0, 80 is non-uniform along the web width direction, the aluminum webs 12 conveyed by the pass rolls 16 will have water droplet streams from a plurality of spray devices 20, 80. Will be bathed in sequence,
The front and back surfaces of the aluminum web 12 are cleaned evenly before being removed from the cleaning tank 14.

The etching processing apparatus 1 described above is used.
In No. 0, only the surface of the aluminum web 12 was initially cleaned by the overflow-type spray device 18 according to the present embodiment, but two spray devices 18 are installed so as to face the front surface and the back surface of the aluminum web 12, respectively. The front surface and the back surface of the aluminum web 12 may be initially cleaned by water flows from these two spray devices 18. However, when two overflow-type spray devices 18 are installed in this way, the inclination angle θ ₁ (see FIG. 2) of the inclined region 66 of the straightening vane 32 is 30 ° to
Since it is limited within the range of 90 ° (preferably 60 ° to 70 °), it becomes difficult to clean the back surface of the aluminum web 12 by the water flow from the spray device 18. In order to solve this, for example, the pass roll 16 in the cleaning tank 14 is laid out so as to convey a part of the aluminum web 12 along the vertical direction, and the aluminum web 12 conveyed along this vertical direction. Two spray devices 18 are arranged so as to face the front surface and the back surface, respectively.
As a result, the water stream formed by the two spray devices 18 can be exposed to the front surface and the back surface of the aluminum web 12 under the same conditions.

[0044]

EXAMPLES Next, the etching processing apparatus 1 shown in FIG.
At 0, the overflow of the spray device 18 (see FIG. 2) according to the embodiment of the present invention is used for the aluminum web 12
Example 1 is a case in which the aluminum web 12 is initially cleaned by using the slit type spray device 112 (see FIG. 6) instead of the spray device 18, and is a “comparative example 1”. The case where the aluminum web 12 is initially cleaned using the mold spray device 20 and the spray device 80 (see FIGS. 4A and 4B) is specifically referred to as “Comparative Example 2” and “Comparative Example 3”, respectively. Comparison and explanation will be made.

Here, in Example 1 and Comparative Examples 1 to 3,
As the aluminum web 12, an aluminum material specified in JIS1100 is used as a processing material, and the thickness is 0.24 mm,
The aluminum web 12 is rolled to a width of 1300 mm and is used for 30 to 200 m / min by a pass roll 20.
While being transported at the transport speed of 1, the etching solution was attached in the etching tank 104 of the etching processing apparatus 10 and then cleaned in the cleaning tank 14.

The following (Table 1) shows Example 1 and Comparative Examples 1 to 1.
3, the minimum required flow rate of cleaning water for clearing the quality standard, the surface quality evaluation of the aluminum web 12 after etching, and the maintenance cycle necessary for surely clearing the quality standard are described.

[0047]

[Table 1] As is clear from the above (Table 1), when the spray apparatus 112 according to Comparative Example 1 is used for the initial cleaning of the aluminum web 12, the supply amount of cleaning water to the spray apparatus 112 is 10%.
Unless it is set to 0 (l / min · m) or more, the surface quality of the aluminum web 12 after alkali etching cannot be improved, and in the spray device 112, the slit mouth 122 is clogged with foreign matter and the like in the web width direction. Since the non-uniformity of the water amount distribution along the line increases over time, the surface quality of the aluminum web 12 cannot be maintained in a good state unless the spray device 112 is maintained at a short cycle of 14 days or less.

When the spray equipment 20, 80 according to Comparative Example 2 and Comparative Example 3 is used for the initial cleaning of the aluminum web 12, the supply amount of cleaning water to the spray apparatus 20, 80 is 120 (l / min). -If m) or more, the surface quality of the aluminum web 12 after alkali etching is good or not good, but the quality standard cannot be satisfied, and the wide-angle nozzle 76 is also used in these spray devices 20 and 80.
Or, since the nonuniformity of the water amount distribution along the web width direction increases with time due to clogging of the nozzle opening 78 with foreign matter,
If the spray device 112 is not maintained in a short cycle of 30 days or less, the surface quality of the aluminum web 12 cannot be maintained good and the quality standard cannot be maintained.

As compared with Comparative Examples 1 to 3, when the spray device 18 according to the first embodiment is used for the initial cleaning of the aluminum web 12, the supply amount of the cleaning water to the spray device 18 is 40.
If it is (l / min · m) or more, the surface quality of the aluminum web 12 after alkali etching can be made extremely good, and the spray device 18 can be cleaned over a very long period of 300 days or more. It is possible to maintain the surface quality of the aluminum web 12 in an extremely good state without performing the maintenance described above.

[0050]

As described above, according to the metal web cleaning spray device of the present invention, the metal web can be uniformly cleaned by the thin film curtain-like water flow over the entire width,
In addition, it is possible to prevent, for a long period of time, a decrease in cleaning ability that causes uneven cleaning of the metal web without performing special maintenance.

According to the method of cleaning a metal web of the present invention, the cleaning unevenness of the metal web is prevented from occurring.
The metal web can be efficiently washed with a small amount of water.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of an etching processing apparatus to which an overflow type spray apparatus according to an embodiment of the present invention is applied for initial cleaning.

FIG. 2 is a side sectional view showing a configuration of an overflow type spray device according to an embodiment of the present invention.

FIG. 3 is a side view and a front view showing a configuration of a current plate in an overflow type spray device according to an embodiment of the present invention.

FIG. 4 is a front view showing a configuration of a nozzle type spray device arranged on the downstream side of the overflow type spray device in the cleaning tank shown in FIG.

FIG. 5 is a side view showing a schematic configuration of an etching processing apparatus to which a slit type spray apparatus is applied for initial cleaning.

6 is a side cross-sectional view showing the configuration of the slit type spray device shown in FIG.

[Explanation of symbols]

12 Aluminum web (metal web) 18 Spray device (cleaning spray device) 20 spray device (cleaning spray device) 24 Water storage tank 26 Overflow part 36 Water bottle (water supply means) 40 Water supply pipe (water supply means) 32 Current plate 34 Rectifier (rectifier plate) 62 Rectifying surface 80 spray device (cleaning spray device)

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H114 AA04 AA14 DA04 GA02 GA27                       GA31 GA35                 3B201 AA08 AB13 BB04 BB87 BB90                 4K053 PA10 PA12 QA06 RA07 SA05                       SA07 XA21 XA22 XA46 XA50                       YA04 YA30 ZA10

Claims (3)

[Claims] 1. A spraying apparatus for cleaning a metal web, which forms a water stream flowing toward a long strip-shaped metal web, and cleans the metal web by the water stream, which stores cleaning water for forming the wash water stream. , A water storage tank provided with an overflow portion for flowing out the wash water when the water level of the wash water becomes higher than a predetermined overflow water level, and water storage so that the water level in the water storage tank is kept higher than the overflow water level A water supply means for supplying washing water into the tank, and a curved U-shape that opens downward and is attached to the overflow portion so that a part of the base end side thereof is immersed in the washing water. A straightening surface that directs the metal web from the base end portion to the front end portion is formed, and the cleaning water that has flowed out from the overflow portion is protected by the straightening surface from the metal web. A spraying device for cleaning a metal web, comprising: a straightening plate for rectifying a water flow in the form of a thin film curtain having a wider width, and dropping the water flow from the tip end of the rectifying surface toward the metal web. . 2. The rectifying plate is made of a metal plate, and the rectifying surface has a surface roughness (Ra) of 0.3 μm to 1 μm.
The spray device for cleaning a metal web according to claim 1, wherein the spraying device has a range of 0.0 μm. 3. A long strip-shaped metal web is made to travel along a predetermined traveling path, and a water spray or a water droplet stream flowing toward the metal web is formed by a cleaning spray device arranged along the traveling path. A method for cleaning a metal web, comprising cleaning the metal web by means of a method, wherein the metal web is disposed on the most upstream side along the traveling route.
Alternatively, a water stream is formed by the cleaning spray device described in 2,
After cleaning the metal web with the water flow, the cleaning water in a pressurized state by a plurality of cleaning spray devices arranged downstream of the cleaning spray device according to claim 1 or 2 along the traveling path. A method for cleaning a metal web, characterized in that the metal web is cleaned by injecting water from a nozzle portion onto the metal web.