Technical field
[0001]
The present invention relates to a liquid removal method using the liquid removal device and which removes the liquid adhering to the surface of the plate-like member.
BACKGROUND
[0002]
On the surface of the steel sheet after hot rolling, an oxide film called scale is formed. Because scale which causes the flaw or the like of the steel plate, if necessary, a pickling treatment with hydrochloric acid or sulfuric acid or the like to the steel sheet. In conventional continuous pickling line, after then straightening the leveler rewinds the steel sheet coiled by the uncoiler and a continuous steel sheet by welding the tip of the steel sheet of the preceding trailing edge and the trailing of the steel sheet, the scale of the steel sheet surface by causing Tsuban the pickling tanks dissolved and removed. Steel sheet scale is removed by pickling tank, the acid and water adhering to the surface is removed by water washing tank, after being dried with a dryer and wound again into a coil.
[0003]
　Here, conventionally, in order to remove the acid or water adhering to the steel plate, placed in the washing tank, a pair of wringer roll for removing liquid steel sheet strip passing, remaining on the surface of the steel sheet after passing through wringer roll blown off liquid with hot air, we have utilized a dryer to facilitate drying. Wringer roll, the surface is formed with a soft rubber layer, squeezing the liquid adhering to the steel sheet surface by pressing the wringer roll the steel sheet is removed.
[0004]
　At this time, when the gap between the two ends of the wringer roll and the steel sheet occurs, liquid is retained in the gap, the liquid remains in the band at both ends surfaces of the steel sheet after passing through wringer roll. Moreover, the use of wringer roll-term results the space portions corresponding to both ends of the steel sheet does not contact the steel plate worn, spread the range of liquid remaining on the surface of the steel sheet. In this way the surface of the steel sheet after passing through wringer roll liquid remains, can not be blown off sufficiently by dryers.
[0005]
　Therefore, between the wringer roll and dryer set up draining device, a technique for removing the liquid remaining after passing through wringer roll it has been proposed. For example, Patent Document 1, toward the gap formed between the pair of liquid removing roll to remove while pressing the liquid adhering to the upper and lower surfaces of the steel strip, with the liquid cutting roll and the ends of the steel strip the gas directed from the strip center portion strip end and a nozzle for injecting a predetermined flow rate, the method of removing the liquid is disclosed.
CITATION
Patent Document
[0006]
Patent Document 1: Japanese Patent Publication No. 6-65766
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　However, even using the method of removing the liquid described in Patent Document 1, it is necessary to include both wringer roll and dryer, the cost of maintaining the equipment increases.
[0008]
　The present invention has been made in view of the above problems, it is an object of the present invention, without using a wringer roll and dryer that can remove the liquid on the steel sheet, the new and improved It is to provide a liquid removal apparatus and a liquid removal method using the same.
Means for Solving the Problems
[0009]
　In order to solve the above problems, according to an aspect of the present invention, there is provided a liquid removal device for removing liquid adhering to the surface of the plate-like member to be conveyed, the injection gas to the surface of the plate-like member a slit nozzle that, and a gap measuring device for measuring the gap between the injection port and the plate-like member of the slit nozzle, slit nozzle is moved downstream of the plate-like member to move relative to the slit nozzle toward the side to the upstream side are disposed so as to inject the gas, the gas pressure inside the slit nozzle nozzle pressure P n is defined as [KPa], °] is defined to be the length of the nozzle back in the moving direction is defined as L [mm], a gap is defined as h [mm], the slit width of the slit nozzle when defined as d [mm], the following satisfy the relational expression, the liquid removal device is provided.
[Number 1]

[0010]
　Liquid removal apparatus may further include a gap adjusting mechanism for adjusting the gap based on the measurement result of the gap measuring device. Gap adjustment mechanism to adjust the gap to 20mm below.
[0011]
　Gap adjusting mechanism, by changing the position of the slit nozzle may adjust the gap.
[0012]
　Alternatively, when the plate-like member by the table rolls for conveying the plate-like member is moved in the moving direction, the gap adjustment mechanism, by changing the position of the table rolls the plate-like member is placed, by adjusting the gap it may be.
[0013]
　Gap measuring device, respectively to measure the gap in the measurement position near both longitudinal ends of the injection port of the slit nozzle, a gap adjusting mechanism, the gap at the measurement position may be adjusted to 20mm or less, respectively.
[0014]
　Gap measuring device may measure the gap by, for example, a laser distance meter.
[0015]
　Slit nozzle is fixed, by the plate-like member is moved in the moving direction by the transport device may be moved relative to the slit nozzle.
[0016]
　Conveying device may be a table roll the plate-like member is placed.
[0017]
　Alternatively, the transport apparatus includes a winding Tomaki return device comprising a payoff reel to rewind the wound plate member in a coil shape, the liquid plate member removed and a tension reel for winding into a coil it may be.
[0018]
　Further, the plate-shaped member is stationary and the slit nozzle may be moved relative to the plate member by the nozzle moving mechanism.
[0019]
　Slit nozzle of the liquid removal device, an injection port, a nozzle body and a gas flow path for guiding the gas fed from the outside to the injection port, the downstream side in the movement direction of the plate-shaped member from the injection port of the nozzle body a back member having a nozzle back that extends toward, may be composed of. At this time, the nozzle back is a facing surface of the backing member opposite to the surface of the plate-like member.
[0020]
　Further, according to another aspect of the present invention, by using the liquid removal device, a liquid removal method for removing liquid adhering to the surface of the plate-like member, the slit nozzle injection port and the plate-like member a measuring step of measuring the gap measuring device gaps, based on the measured gap, by changing at least one of the positions of the slit nozzle or plate-shaped member, the gap adjustment for adjusting the gap 20mm or less a step, while relatively moving the slit nozzle and the plate-like member, and injecting gas to the surface of the plate-like member from a slit nozzle, and a liquid removal step of removing the liquid adhering to the surface of the plate-like member It includes a liquid removal method is provided.
[0021]
　Each time the plate thickness of the plate-like member is changed, the gap may be readjusted by performing the measurement step and gap adjustment step.
Effect of the invention
[0022]
　According to the present invention described above, without using a wringer roll and dryer, it is possible to remove the liquid on the steel plate.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023]
FIG. 1 is an explanatory view showing the draining status by the liquid removing device using a common slit nozzle.
FIG. 2 is an explanatory diagram showing a draining status by the liquid removing device using a slit nozzle according to an embodiment of the present invention.
Is a side view showing an example of the configuration of FIG. 3 the liquid removal apparatus according to the embodiment.
It is a rear view of the liquid removal apparatus shown in FIG. 4 FIG.
FIG. 5 is an explanatory diagram showing the detailed arrangement of the slit nozzle according to the embodiment.
[6] velocity u when the rear length 20mm L, and the sum of 90 ° between the injection angle θ and a rear inclination angle beta + (x) and velocity u - shows an example of the relationship between (x) Description it is a diagram.
[7] back length 15mm L, and the flow rate u of when the the 50 ° sum of the injection angle θ and a rear inclination angle beta + (x) and velocity u - shows an example of the relationship between (x) Description it is a diagram.
[8] when changing the back angle of inclination β and the back length L of the injection angle θ as 45 °, the gap h and the nozzle pressure P n is an explanatory diagram showing the relationship between.
[9] with respect to plot line in FIG. 8 is an explanatory diagram for explaining a state of flow of the nozzle back.
It is an explanatory view showing a modification of the nozzle arrangement of FIG. 10 liquid removal device according to the embodiment.
[Figure 11] when the front inclination angle α with 30 °, is a graph showing an relationship between the thickness of the liquid remaining on the back length and the steel sheet surface.
12 is a graph showing an relationship between the thickness of the liquid remaining in the gap and the steel sheet surface.
Is an explanatory view showing the relationship between [13] the film thickness of the liquid on the surface of the steel sheet and the steel plate quality for defect determination rate.
[Figure 14] when the front inclination angle α as 35 °, which is a graph showing an relationship between the thickness of the liquid remaining on the back length and the steel sheet surface.
DESCRIPTION OF THE INVENTION
[0024]
　Reference will now be described in detail preferred embodiments of the present invention. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0025]
　<1. Overview>
　First, with reference to FIGS. 1 and 2, will be described a schematic configuration of a liquid removal apparatus according to an embodiment of the present invention. Figure 1 is an explanatory diagram showing a draining status by the liquid removing device using a common slit nozzle 3. Figure 2 is an explanatory diagram showing a draining status by the liquid removal apparatus using the slit nozzle 10 according to an embodiment of the present invention.
[0026]
　A liquid removal device according to the present embodiment, the air injected into the surface of the steel sheet is a plate-shaped member by a slit nozzle, to remove the liquid on the steel sheet surface. The liquid removal device using a common slit nozzle, as shown in FIG. 1, the injection of the slit nozzle 3 relative to the surface of the steel sheet from the downstream side in the movement direction of the steel sheet moves relative to the liquid removal device air blow device for injecting air is used from the mouth 3a. As shown in FIG. 1, a high-speed gas jet f1 ejected from the slit nozzle 3 is to collide with the surface of the steel sheet S, by the flow f2 toward the upstream side in the movement direction by pushing back the liquid 5a on the steel sheet S, removing liquid 5a on the steel plate S.
[0027]
　On the other hand, when the gas jet f1 collides with the surface of the steel sheet S, the reversing flow f3 also occur toward the downstream side in the movement direction. This and reversing flow f3, causes when the air blowing device draws in ambient air, the outside air suction flow f4 flowing on the surface of the steel sheet S interfere along the back of the slit nozzle 3, the gas jet f1 is temporarily disturbed. This reduces the impact pressure when the gas jet f1 collides with the surface of the steel sheet S, the pressure of the flow f2 toward the upstream side in the movement direction is also reduced, it can not be sufficiently removed liquid 5a on the steel sheet S, liquid 5b on the steel sheet S is also in the direction of movement downstream of the slit nozzle 3 will remain.
[0028]
　Accordingly, the inventors have studied the structure of the liquid removal apparatus capable of suppressing a collision pressure decrease of the gas jet f1 due to interference with the reversing flow f3 after the surface collision of the outside air suction flow f4 and the steel sheet S. As a result, as shown in FIG. 2, the nozzle back 104 is a surface of the downstream side in the movement direction of the steel sheet S, extend along the surface of the steel sheet S to the downstream side in the movement direction than the slit nozzle 3 shown in FIG. 1 by, suppressing the influence of the outside air suction flow f4 by Coanda effect, to obtain a finding that can suppress the turbulence of the gas jet f1. Hereinafter, it will be described in detail a liquid removal apparatus according to this embodiment.
[0029]
　<2. Configuration of the liquid removal device>
(2-1. Overall Configuration)
　First, with reference to FIGS. 3 and 4, illustrating the overall configuration of the liquid removal device 1 according to this embodiment. Figure 3 is a side view showing a configuration example of a liquid removal apparatus 1 according to this embodiment. Figure 4 is a rear view of the liquid removal device 1 shown in FIG. In the present embodiment, the case where the liquid removal device 1 is used by fixing. That is, the slit nozzle 10 is fixed, it is assumed that the steel sheet S conveyed by the conveying device is moved relative to the slit nozzle 10.
[0030]
　Liquid removal device 1 according to this embodiment is an apparatus for removing liquid adhering to the surface of the steel sheet S, which is an example of example, a plate-like member. Liquid removal device 1 is fixed, by the steel sheet S is conveyed by the conveying device, the steel sheet S is moved relative to the liquid removal device 1. Hereinafter, also referred to as a conveyance direction moving direction of the steel sheet S to be moved relative to the liquid removal device 1. Liquid removal device 1, as shown in FIG. 3, are respectively arranged vertically so as to be symmetrical with respect to the steel sheet S being conveyed by the conveying device. Liquid removal device 1 of the upper and lower may be the same configuration. Transfer device for transferring the steel sheet S may be a table roll is moved by rotating the example placed on the steel plate S. Alternatively, the transport device may be a wound Tomaki return device consisting of both ends roll provided at both sides of the liquid removal device 1 in the conveying direction of the steel sheet S. Winding Tomaki return device, as both ends roll, a payoff reel to rewind the steel plate S wound like a coil, and a tension reel for winding the steel sheet S in which the liquid has been removed in the surface in a coil shape by the liquid removal device 1 It is equipped with a.
[0031]
　Liquid removal device 1 according to this embodiment, as shown in FIG. 3 includes a slit nozzle 10, the gap measuring device 30, and a gap adjustment mechanism 40.
[0032]
　Slit nozzle 10, the gas fed from the outside via the air supply pipe 20 (e.g., air) to be injected to the surface of the steel sheet S from the nozzle tip of the injection port 112. Slit nozzle 10, the slit length direction of the injection port 112 which opens in a slit shape is arranged so as to correspond to the width direction of the steel sheet S. Thus, it is possible to remove the liquid on the steel sheet S over the entire width of the steel sheet S. Injection port 112, toward the downstream side in the conveying direction of the steel sheet S to the upstream side (i.e., from the X-axis negative direction toward the positive direction side) is directed to the surface of the steel sheet S so as to inject the gas. The slit nozzle 10, as shown in FIG. 4, on both sides of the slit length direction of the injection port 112 which opens in a slit shape (Y-direction), a gap adjustment to close / separate the slit nozzle 10 with respect to the steel sheet S It is supported by a mechanism 40. By moving up and down the slit nozzle 10 by a gap adjusting mechanism 40, the gap between the injection port 112 and the steel sheet S of the surface is adjustable.
[0033]
　Slit nozzle 10 according to this embodiment, as shown in FIG. 2, to suppress the influence of the outside air suction flow f4, for suppressing the turbulence of the gas jet f1, the nozzle pressure is the gas pressure inside of the slit nozzle 10 When the injection angle of the slit nozzle 10, the rear inclined angle, back length, the slit width and the gap is configured so as to satisfy a predetermined relationship. The relationship between detailed configurations and nozzle pressure of the slit nozzle 10 will be described later.
[0034]
　Gap measuring device 30, the distance between the injection port 112 and the steel sheet S of the surface at the tip of the slit nozzle 10 (hereinafter, also referred to as "gap".) Is measured. Gap measuring device 30, as shown in FIGS. 3 and 4, are respectively provided in the slit length direction (Y direction) on both sides of the injection port 112 of the slit nozzle 10. By providing the position according to the gap measuring device 30, it is possible to detect the inclination with respect to the surface of the steel sheet S of the injection port 112 of the slit nozzle 10 in the slit longitudinal direction, so that the gap in the slit longitudinal direction is constant it can be adjusted to. Gap measuring device 30, for example may be provided a slit nozzle 10 at the slit length direction at substantially the same position and the gap adjustment mechanism 40 for moving up and down.
[0035]
　Gap measuring device 30 is provided with a distance sensor 31 such as a laser rangefinder. Gap measuring device 30, for example, the distance sensor 31 to the surface facing the steel sheet S, based on the phase difference between the reflected light on the surface of the steel sheet S of the laser beam and its laser beam emitted against the steel sheet S, a gap to measure. The distance sensor 31, for example, as shown in FIG. 4 may be provided one each on the gap measuring device 30 may be a plurality of respectively disposed in the slit length. The distance sensor 31 is arranged near both 112e of the injection port 112. The vicinity of both ends 112e of the injection port 112 in the present embodiment, when the length of the injection port 112 of the slit nozzle 10 in the slit longitudinal direction and slit length w, from both ends 112e of ± 1 / 4w jets 112 It refers to the range. The distance sensor 31, it is necessary to be facing the steel sheet S, for example, its installation in accordance with the minimum strip width and maximum strip width of Tsuban possible steel S in line liquid removal device 10 is installed position is determined. Thus the distance sensor 31, a vicinity of both ends 112e of the injection port 112, and is installed so as to face the steel plate S. For example, the distance sensor 31 may be installed from the end of the steel sheet S to the inner position approximately 1/6 of the plate width. Gap measuring device 30, a gap obtained based on the detection result of the distance sensor 31, as the gap measured value, and outputs to the gap adjustment mechanism 40.
[0036]
　Gap adjustment mechanism 40 is adjusted so that the gap based on the measurement result of the gap measuring device 30 becomes a predetermined size. Gap adjustment mechanism 40 according to this embodiment includes a driving unit 41 for moving the slit nozzle 10 in the vertical (Z-direction), control unit for controlling the driving of the driving portion 41 and a (not shown.).
[0037]
　Drive unit 41, as shown in FIGS. 3 and 4 are provided on each of the slit length direction (Y direction) on both sides of the injection port 112 of the slit nozzle 10, via a support member 51, 53, 55 slit supporting the nozzle 10. By thus installing a drive unit 41, it is possible to equalize the distance between the injection port 112 and the steel sheet S in the slit longitudinal direction of the injection port 112. Drive unit 41 is composed of, for example, a cylinder, a support member 55 to move the fixed piston, it is possible to adjust the height position of the slit nozzle 10. The present invention is not limited to this example, the drive unit 41, for example, steel plate S may be an actuator for changing the height position of the mount tables roll. Thus it is also possible to adjust the gap by close / separate the table roll against the injection port 112 of the slit nozzle 10.
[0038]
　Control unit, based on the measurement result of the gap measuring device 30, injection port 112 drives the drive units 41 so as to approach as much as possible steel sheet S in a range not contacting the steel sheet S, adjust the height position of the slit nozzle 10 to. Gap value measured by the gap measuring device 30, since the distance sensor is a distance to the surface of the steel sheet S, the controller writes the value obtained by subtracting the distance between the injection port 112 of the distance sensor and the slit nozzle 10 from the gap measurements as current gap is adjusted to the height position of the slit nozzle 10 is within a predetermined range. The gap adjustment by the control unit, gas injected from the slit nozzle 10 flows between the nozzle back and the steel sheet S of the slit nozzle 10, the outside air suction flow as shown in FIG. 2 (f4) a gas jet (f1) it can be made to the affect on can be suppressed. For achieving the such action, the gap adjustment mechanism 40, it is preferable to 20mm below the gap.
[0039]
(2-2. Relationship between the slit nozzle arrangement and the nozzle pressure)
　slit nozzle 10 according to this embodiment, as described above, to suppress the turbulence of the gas jet f1 to suppress the influence of outside air suction flow f4 a nozzle pressure of the slit nozzle 10, the injection angle of the slit nozzle 10, the rear inclined angle, back length, the slit width and the gap is configured so as to satisfy a predetermined relationship.
[0040]
　Figure 5 is an explanatory diagram showing the detailed arrangement of the slit nozzle 10 according to this embodiment. As shown in FIG. 5, the slit nozzle 10 is provided with a front nozzle face 102 toward the upstream side of the steel plate S from the injection port 112, and a nozzle back 104 toward the downstream side in the conveying direction of the steel sheet S from the injection port 112. Nozzle front 102 is suppressed inclination in the conveying direction upstream side, the nozzle back 104 is extended along the surface of the steel sheet S to the downstream side in the transport direction.
[0041]
　Here, as a reference direction C1 to a direction perpendicular to the surface of the steel sheet S, the injection angle the angle between the injection direction C3 of the gas from the injection port 112 in the reference direction C1 and the slit nozzle 10 θ [°], the reference direction C1 a front inclination angle alpha [°] the angle between the nozzle front 102, rear inclination angle beta [°] the angle between the injection direction C3 and nozzle back 104 of the gas to be. Further, the length of the nozzle back 104 and the back length L [mm] in the transport direction C2 of the steel plate S. The distance the gap h between the injection port 112 and the steel sheet S of the surface [mm], the opening width the slit width d of the slit of the slit nozzle 10 [mm], the internal gas pressure of the slit nozzle 10 nozzle pressure P n [ when the KPa], the liquid removal device 1 is configured to satisfy the relation of the following formula (1) to (3).
[0042]
[Number 2]

[0043]
　Incidentally, the injection angle θ and a rear inclination angle beta, is intended to represent the magnitude, and those represented by a value of 0 or greater. The front tilt angle alpha, the reference direction C1 as 0 °, the inclination of the positive values ​​of the upstream side of the steel plate S, and represents the slope of the downstream side by a negative value. For example, as shown in FIG. 3, the length L back when the nozzle back 104 is not parallel to the steel sheet S, when the actual rear length was L '[mm], L'cos (90 ° -θ it can be calculated by-beta). Thus, the back length L corresponds to the length of the conveying direction of the nozzle back 104 in the horizontal projection plane when projected nozzle back 104 to the horizontal projection plane (X-direction).
[0044]
(A. Nozzle pressure P n relationship with)
　First, the equation (1) indicated in FIGS. 1 and 2, to suppress the influence of the outside air suction flow f4 for suppressing turbulence of the gas jet f1 by it represents the conditions. Here, with respect to the slit nozzle 10 shown in FIG. 5, to define the physical quantities as follows. x indicates the position in the conveyance direction of the steel plate S. The position of the most downstream side of the nozzle back 104 in the conveyance direction of the steel sheet S (X direction) and the reference position (x = 0).
　u + (x): flow rate drawn into the injection port side at the Coanda effect
　u - (x): the transport direction of the gas jet impinging on the steel plate (X-direction) component velocity
　y (x): distance between steel sheet and the nozzle back
　λ: pipe friction coefficient
[0045]
　u + X direction distribution of the 10% of the size of the high-speed jet empirically there is knowledge initial velocity u + when a (0), the pressure loss as the flow proceeds in the X-direction flow velocity initial speed u + (0) It decreases. Quantitatively, the pressure loss with respect to the position in the X direction is given by the following formula (1-1).
[0046]
[Number 3]

[0047]
　Substituting the variation of pressure loss represented by the above formula (1-1) to formula (1-2), the rate of decrease Delta] u + (x) is obtained.
[0048]
[Formula 4]

[0049]
　Then, the following equation (1-3), decrease of speed obtained Delta] u + a (x) velocity u in the previous position + by subtracting from (x), velocity u in the x + dx position + (x + dx) is determined It is.
[0050]
[Formula 5]

[0051]
　On the other hand, the transport direction component velocity u of gas jets colliding with the steel sheet - (x) is calculated by the following formula (1-4) using a flow rate u of the jet of gas to be injected from the slit nozzle 10.
[0052]
[Number 6]

[0053]
　Here, as shown in FIG. 5, the reference position (x = 0) of the back length L apart position of the nozzle back 104 to the upstream side in the transport direction from the flow velocity u that is drawn into the injection port 112 side by the Coanda effect + a (L), the carrying direction component velocity u of gas jets colliding with the steel plate S - Given the size of the (L).
[0054]
　First, the flow velocity u + (L) is the flow velocity u - (L) when less is (u + (L) ≦ u - (L)), that is, the transport direction component velocity u of gas jet - (L) is a Coanda flow rate u drawn by effect + is when the (L) Thus, the gas jets f1, the flow rate u drawn by the Coanda effect + not affected from (L), Therefore, collides with the steel sheet S without gas jet f1 is disturbed, as shown in FIG. 2, liquid removal capability of liquid removal device 1 can be exhibited.
[0055]
　On the other hand, the flow velocity u + (L) is the flow velocity u - when (L) is greater than (u + (L)> u - (L)), that is, the flow velocity u drawn by the Coanda effect + (L) of the gas jet carrying direction component velocity u - is when the more large (L). At this time, the gas jet f1 flow velocity u drawn by Coanda effect + affected from (L). As a result, the vibration in gas jet f1 horizontal, since the reduced impact pressure of the steel sheet S in the gas jet f1, leading to draining capacity reduction of the liquid removal device 1 as shown in FIG.
[0056]
　From the above, the conveyance direction component velocity of the gas jet u - (L) is the flow velocity u is pulled by the Coanda effect + By such a (L) That is, the flow velocity u of gas jet discharge position at the position of x = L + and velocity u - to consider the balance of, it is possible to state liquid removal capability of liquid removal device 1 has been demonstrated.
[0057]
　For example, in FIG. 6, 20 mm rear length L, a flow rate u is drawn into the injection port 112 side the sum of the injection angle θ and a rear inclination angle β at the Coanda effect when the 90 ° + a (x), - shows an example of the relationship between (x). As shown in FIG. 6, the distance greater than 10mm from the reference position (x = 0) in the upstream side, the conveying direction component velocity u of gas jet - (x) is pulled by the Coanda effect to the injection port 112 side velocity u + is larger than (x). Therefore, the back length L is the case of 20 mm, the conveying direction component velocity u of gas jet - (x) is the flow rate drawn into the injection port 112 side u at Coanda effect + is larger than (x), the nozzle back 104 flow is rectified.
[0058]
　On the other hand, for example, in FIG. 7, 15 mm rear length L, a flow rate is drawn into the injection port 112 side at the Coanda effect when the sum of the injection angle θ and a rear inclination angle β was 50 ° u + (x) When the conveyance direction component velocity u of gas jets colliding with the steel plate S - shows an example of the relationship between (x). As shown in FIG. 7, even apart 15mm in the conveying direction upstream side from the reference position (x = 0), the transport direction component velocity u of gas jet - (x) is the flow rate drawn by the Coanda effect to the injection port 112 side U Tasu smaller than (x). Therefore, when the back length L of 15 mm, the conveying direction component velocity u of gas jet - (x) is the flow velocity u is drawn into the injection port 112 side by the Coanda effect + smaller than (x), the nozzle back 104 the flow was turbulent, so that the gas jet f1 is disturbed.
[0059]
　Therefore, the present inventor has conveyance direction component velocity of the gas jet u - (L) is the flow velocity u drawn by the Coanda effect + result of examining the (L) That is, the nozzle pressure of the slit nozzle 10 P n [KPa] is, the gap h [mm], the back length L [mm], the back inclination angle beta [°], the slit width d [mm] and the injection angle theta [°] in represented by equation F (h, L, β, θ, d) by arranging constitutes a slit nozzle 10 so that the above value of, suppressing the influence of the outside air suction flow f4, the gas jet f1 it is possible to suppress the disturbance.
[0060]
　Relation F (h, L, β, θ, d) , for example the flow in the nozzle back 104 of the slit nozzle 10 is visualized by the tuft method, the flow of the nozzle back 104 nozzle pressure P rectifies n identifying the it can be obtained at. Above formula (1), the slit width d as 0.4 mm, 1 mm ~ 25 mm gap h, the back length L of 10 ~ 50 mm, rear inclination angle β of 5 ~ 45 °, the injection angle θ 0 ~ 75 ° the range is, the nozzle pressure P n nozzle pressure P flow nozzle back 104 rectifies when gradually changed to 5 ~ 1000 KPa n that the threshold was measured using the tuft method set it is.
[0061]
　Specifically, arranged along the conveying direction of the diameter of 0.025 mm, the steel plate S a polyethylene yarn length 3mm in the nozzle back 104 at 5mm pitch, nozzle pressure P n nozzles back varies depending on the 104 by to move the yarn through the flow, the flow of the nozzle back 104 and visualized. When all of the yarn formed in the nozzle back 104 is directed in the conveying direction of the steel sheet S, and determines that the flow of the nozzle back 104 is rectified, the nozzle pressure P at this time n was a threshold. Then, the gap h, the back length L, a nozzle pressure P obtained by set by changing the back angle of inclination β and the injection angle theta n for each threshold, the gap h, the back length L, a rear inclination angle β and by performing the multivariate regression analysis on the injection angle theta, the equation (1) is obtained.
[0062]
　Relationship F of the thus obtained formula (1) (h, L, β, θ, d) the value of a nozzle pressure P of the slit nozzle 10 n in the following cases, the conveyance direction component velocity of the gas jet u - (L) is the flow velocity u drawn by the Coanda effect + a (L) or more. In this case, collide with the steel sheet S without gas jet f1 is disturbed, the liquid removal device 1 exerts draining capacity. Therefore, by setting to configure the liquid removal device 1 so as to satisfy the above formula (1), it is possible to remove the liquid on the steel plate S.
[0063]
　Further, the gap h, the back length L, a the rear tilt angle β and the injection angle θ is set as follows.
[0064]
(B. Injection angle theta, rear inclination angle beta)
　and the injection angle theta and rear inclination angle beta, as represented by the above formula (2), these sums are set to be 60 ° or more. The sum of the injection angle θ and a rear inclination angle β represents the inclination of the nozzle back 104 relative to the reference direction C1. When the sum of the injection angle θ and a rear inclination angle β is 90 °, the parallel to the nozzle back 104 and the steel sheet S of the surface. The injection angle θ and sum smaller than 60 ° with the rear inclination angle beta, interference occurs between the reversing flow f3 after the surface collision of the outside air suction flow f4 and the steel sheet S, and reduced impact pressure of the gas jet f1, it becomes impossible to remove the liquid 5a on the surface of the steel sheet S. Therefore, the sum of the injection angle θ and a rear inclination angle β is set to 60 ° or more. The upper limit of the sum of the injection angle θ and a rear inclination angle β, the nozzle back 104 is the maximum value in the range which does not contact with the surface of the steel sheet S.
[0065]
　Nozzle back 104 is desirably are arranged to be parallel to the surface of the steel sheet S. That is, the sum of the injection angle θ and a rear inclination angle β is preferably set to 90 °. Thus, after the gas jet f1 collides with the surface of the steel sheet S, that reversing flow f3 toward the downstream side of the steel sheet S is to flow between the nozzle back 104 and the steel sheet S in the surface smoothly it can.
[0066]
　Further, the ejection angle θ of the gas, is preferably a 45 °. Thus, it injected gas from the injection port 112 of the slit nozzle 10 impinge at an angle of 45 ° from the transport direction downstream side with respect to the surface of the steel sheet S, the conveyance direction upstream the liquid 5a on the surface of the steel sheet S effectively pushed back toward the side can be removed. When the sum of the injection angle θ and a rear inclination angle beta to consider that it is desirable to be 90 °, the injection angle θ and a rear inclination angle beta, preferably set to 45 °, respectively.
[0067]
(C. Back length L)
　the length L back of the nozzle back 104, as shown in equation (3), it is set to at least 20 mm. A rear length L is 20mm smaller than the outside air suction flow f4 and reversing flow f3 is, collide in the vicinity gas jet f1, disturbs the gas jet f1. Therefore, by the back of the length L or more 20 mm, the collision with the outside air suction flow f4 and reversing flow f3 is, so as not to occur in the vicinity gas jet f1, suppresses the turbulence of the gas jet f1 by drawing in outside air flow f4 . Further, by the back of the length L or more 20 mm, since the outside air suction flow f4 decreases also the pressure of the reversing flow f3 until the collision of the air when the external air suction flow f4 and reversing flow f3 collide disturbed also it becomes smaller. By increasing the back length L, a fresh air suction flow f4 is also difficult enter the section between the nozzle back 104 and the steel sheet S of the surface. Therefore, the back length L is preferably set above 20 mm.
[0068]
　The upper limit of the back length L of the nozzle back 104 is not particularly limited, the equipment may be no contact with other members. For example, the back length L may be up to about 100 mm.
[0069]
(D. Gap h)
　gap h is the distance between the injection port 112 and the steel sheet S of the surface, as described above, being set as much as possible close to the steel sheet S in a range where the injection port 112 does not contact the steel plate S It is desirable Thus, gas injected from the slit nozzle 10 flows between the nozzle back and the steel sheet S of the slit nozzle 10, the outside air suction flow f4, as shown in FIG. 2 can be prevented from affecting the gas jet f1 it can be so. For achieving the such action, the gap h is desirably set to, for example, 20mm or less.
[0070]
　Note that the front inclined angle alpha, is not particularly limited and may be set to 30 ° or less. When the front tilt angle α is greater than 30 °, the front nozzle face 102 is too inclined to the upstream side in the transport direction, after the gas jet f1 collides with the surface of the steel sheet S, toward the upstream side flow f2 is directly upstream directed not prone again flows toward the injection port 112 of the slit nozzle 10 along the nozzle front 102. If such flow is formed, removal performance of the liquid 5a on the surface of the steel sheet S due to the flow f2 is decreased. Therefore, in order to suppress the lowering of liquid removal performance, the front tilt angle α may be set to 30 ° or less. Desirably, it is preferable the front inclination angle α is 0 ° or less. This allows the flow f2 toward the upstream side in the transport direction is more reliably prevented from becoming flow toward the injection port 112 of the slit nozzle 10 again along the front nozzle face 102.
[0071]
　From the above, so as to satisfy the above equation (1) to (3), the slit nozzle 10 is constructed and arranged. Thus, the collision with the outside air suction flow f4 and reversing flow f3 can reduce the gas jet f1 is disturbed, does not decrease impact pressure when the gas jet f1 collides with the surface of the steel sheet S, the conveyance direction pressure toward the upstream side flow f2 can be maintained. Therefore, it is possible to sufficiently remove liquid 5a on the steel plate S. According to the liquid removal apparatus 1 according to this embodiment, since it sufficiently remove the steel plate on the liquid without using a wringer roll and dryer can also be reduced cost of maintaining facilities.
[0072]
　Here, in FIG. 8, the injection angle θ as 45 °, the nozzle pressure P calculated by the gap h and the equation (1) when changing the back angle of inclination β and the back length L n the relationship between show. Nozzle pressure P shown in FIG. 8 n indicates the threshold when the flow of the nozzle back 104 is judged to have rectified by tufts method described above, when both sides of the equation (1) showed the same value ( P n = F (h, L, beta, theta, d) is the value of). That is, the plot line of the case a ~ f shown in FIG. 8, the flow of the nozzle back 104 indicates the boundary between the composed area and turbulent become area rectification. As shown in FIG. 9, if the upper is more plot line or plot, the nozzle pressure P n relational expression F (h, L, β, θ, d) becomes greater than or equal to the value of the relationship of the above formula (1) to meet the flow of the nozzle back 104 is in a state of being rectified. On the other hand, if the lower side of the plot, the nozzle pressure P n is relation F (h, L, β, θ, d) to become smaller than the value of, it does not satisfy the relationship of the above formula (1). As a result, the flow of the nozzle back 104 becomes turbulent, a state of gas jet f1 is disturbed.
[0073]
　8, the sum of the rear inclination angle β and the injection angle θ is the case a ~ c At 90 °, a case d in ~ f 60 °, both of which satisfy the above expression (2). The back length L, a case a, b, d, but e is 25mm or 20mm satisfies the above expression (3), case c, f is 15mm does not satisfy the above expression (3). As shown in FIG. 8, as compared case does not satisfy the above expression (3) c, plots of f is the case a meet the above expression (3), b, d, and the plot line of the e slope is large, the nozzle pressure P even when the gap h is close to the 3 mm n is required than 200 KPa. 200KPa or more nozzle pressure P n when it is necessary, the pressure can not be installed liquid removal device 1 can not be secured by the pipe installation condition of the plant, or air flow necessary even be installed liquid removal device 1 is such as the increase in cost will be enormous is assumed. Therefore, the back length L may be set to more than 20 mm.
[0074]
　On the other hand, the case a, b, d, plots of e has the same degree of inclination, the nozzle pressure P of the slit nozzle 10 even if the gap h is increased n be set smaller than 200KPa and the it is possible to satisfy equation (1). Note that when the back length L are the same, the nozzle pressure P the sum of the rear inclination angle β and the injection angle θ is more needed larger n can be reduced
[0075]
　As described above, the slit nozzle 10, the equation (1) In the structure and arrangement meet to (3), the flow of the nozzle back 104 to rectify, so as not to affect the flow of the gas jet f1 can do. As a result, it is possible to ensure the versatility of the air pressure, it is possible to realize a liquid removal device air flow is also economical.
[0076]
(2-3. Modification)
　slit nozzle 10 of the liquid removal device 1 shown in FIG. 5, although the outer shape of the nozzle itself shows a case that is formed so as to satisfy the above equation (1) to (3) the present invention is not limited to such an example. For example, as shown in FIG. 10, the slit nozzle 10 of the liquid removal device 1, a slit having an outer shape of the axisymmetric commonly used nozzles (hereinafter, referred to. As "nozzle body") 210, back member it may be constructed from 220 Metropolitan. Nozzle body 210 has an injection port 216 is a slit for injecting gas. The nozzle body front 212 and the nozzle main body rear 214, is symmetrical with respect to the jet direction C3 of the gas. Back member 220 is a plate material, for example steel plate. Back member 220 is connected to the nozzle body back 214, constituting the nozzle back extending from the injection port 216 of the nozzle body 210 in the conveyance direction downstream side of the steel plate S. That is, the counter surface of the back member 220 opposite to the surface of the steel sheet S becomes nozzle back.
[0077]
　In such a slit nozzle 10, so as to satisfy the above equation (1) to (3), the bottom surface 222 of the backing member 220 which serves as a nozzle back along the surface of the steel sheet S to the downstream side in the transport direction extending to be set. Thus, similar to the slit nozzle 10 shown in FIG. 5, it is possible to reduce a gas jet f1 is disturbed by the collision with the outside air suction flow f4 and reversing flow f3, gas jet f1 collides with the surface of the steel sheet S does not decrease impact pressure of time, since the can maintain the pressure of the flow f2 toward the upstream side in the conveying direction, it is possible to sufficiently remove liquid 5a on the steel plate S.
[0078]
　Configuration as shown in FIG. 10 can be implemented by providing a backing member 220 relative to the nozzle body 210 is an existing slit nozzle, it requires less changes to the existing facilities. With such a configuration of the liquid removal device, it is possible to obtain the effect of removing surface liquid of the steel sheet S sufficiently.
[0079]
　<3. Liquid removal method>
　removal of liquid adhering to the surface of the steel sheet S is made to face the slit nozzle 10 of the liquid removal device 1 described above to the surface of the steel sheet S, by injecting gas from the slit nozzle 10 to the surface of the steel sheet S It is performed Te. In this case, first, the gap between the injection port 112 and the steel sheet S of the slit nozzle 10 is measured by the gap measuring device 30. Then, based on the measured gap, by changing by driving by the drive unit of the gap adjusting mechanism 40 at least one of the positions of the slit nozzle 10, or the steel sheet S, to adjust the gap 20mm or less. Then, by injecting the gas from the slit nozzle 10 while relatively moving the slit nozzle 10 and the steel sheet S to the surface of the steel sheet S, it is possible to remove the liquid adhering to the surface of the steel sheet S.
[0080]
　Incidentally, the gap adjustment by measuring the gap adjustment mechanism 40 of the gap by the gap measuring device 30, the steel sheet S to be processed may be performed for different. Alternatively, when changing the plate thickness in the sheet passing of the steel sheet S will vary also ear wave plate edge also changes the size of the gap to be allowed. Thus, by measuring the gap by the gap measuring device 30 in real time during the sheet passing of the steel sheet S, it may be adjusted a gap 20mm below the gap adjustment mechanism 40 based on the obtained gap measurements.
Example
[0081]
　Relates slit nozzle for use in the liquid removal apparatus of the present invention, was verified draining effect of removing liquid on the surface of the steel sheet. In this verification, established a liquid removal device according to the present invention after washing facilities continuous steel processing line, after removal of the liquid on the surface of the steel sheet by the liquid removal device, to measure the thickness of the liquid remaining on the surface of the steel sheet . Ringer roll and dryer were not used. At this time, the line speed of the steel sheet is 100 mpm, gap 3 mm, injection angle θ is 45 °, the slit width d is set to 0.4 mm.
[0082]
　Then, the 30 ° front inclination angle alpha, rear inclination angle beta of 10 °, respectively, 15 °, 45 ° (i.e., θ + β = 55 °, 60 °, 90 °) when was the, also the nozzle pressure P n the 90 KPa, in the case of a 150 KPa, investigated the relationship between the thickness of the liquid remaining on the back length L and the steel sheet surface of the nozzle back. The results are shown in Figure 11 and Table 1. In this verification, six rear inclination angle β and the nozzle pressure P of the case A ~ F n for the combination of the evaluated the draining effect when changing the back length L. Branch number of the case A ~ F in the following Table 1, "-1", "- 2", "- 3" indicates that each rear length L is 15 mm, 20 mm, if the 25 mm.
[0083]
　In this verification, the thickness of the liquid remaining after removal of the liquid on the surface of the steel sheet by the liquid removal apparatus was evaluated draining effect. In operation, the evaluation of draining is carried out visually. As shown in the normal 13, the thickness of the liquid on the steel sheet surface becomes more 0.5μm since the liquid remains are visually confirmed, it is determined that the quality of the steel sheet surface defects. From this, the thickness of the liquid on the steel sheet surface was evaluated to have if draining effect less than 0.5 [mu] m. In Table 1, the thickness of the liquid on the surface of the steel sheet is the case 0.5μm smaller "There draining effect (○)", the case where the thickness of the liquid on the steel sheet surface is not less than 0.5μm "draining effect It is that there is no (×) ".
[0084]
[Table 1]

[0085]
　Looking at the verification results shown in FIG. 11 and Table 1, for the case A (case A-1, A-2, A-3) and Case B (Case B-1, B-2, B-3) is injection the sum of the angle θ and a rear inclination angle β is 55 °, does not satisfy the relationship of formula (2). Thus, the nozzle pressure P n be varied or back length L of the nozzle back, the thickness of the liquid on the surface of the steel sheet becomes more than 0.5 [mu] m, it was not obtained a sufficient draining effect.
[0086]
　On the other hand, the case C ~ F, the sum of the injection angle θ and a rear inclination angle β is 60 ° or more, the slit nozzle so as to satisfy the above equation (2) is constructed. These will, when the back length L of the nozzle backside of the case C-1, D-1, E-1, F-1 is less than 20mm, the thickness of the liquid on the surface of the steel sheet is more than 0.5μm next, it did not provide a sufficient draining effect. On the other hand, the equation (3) Case C-2 rear length L of the nozzle back and 20mm or more so as to satisfy the, C-3, D-2, D-3, E-2, E-3, F- in the case of 2, F-3, the thickness of the liquid on the surface of the steel sheet becomes smaller than 0.5 [mu] m, sufficient draining effect was confirmed. In particular, sum 60 ° between the injection angle θ Case E-2 sum of the rear tilt angle β becomes 90 °, the E-3, F-2, F-3, the injection angle θ and a rear inclination angle β compared to case C-2, C-3, D-2, D-3 as a film thickness of the liquid on the surface of the steel sheet becomes smaller, it can be seen that a high draining effect.
[0087]
　Further, through the case A ~ F, when the injection angle theta, the front tilt angle alpha, rear inclination angle beta, the slit width d, and the back length L of the nozzle back are the same conditions, the nozzle pressure P n set a high the more, it can be seen that the draining effect is increased.
[0088]
　For if the draining effect was confirmed, as shown in FIG. 2, the gas flow is considered to have a state of being rectified in the nozzle back of the slit nozzle. On the other hand, if the draining effect is not confirmed, as shown in FIG. 1, the gas stream is turbulent in the nozzle back of the slit nozzle, considered to have a state that affected the gas jet It is.
[0089]
　The nozzle pressure P n as 90KPa a, 10 ° rear inclination angle β (θ + β = 55 ° ), when the back length L of the slit nozzle and 15 mm (Table 1 Case A-1 (Comparative Example 1)) , 15 ° to rear inclination angle β (θ + β = 60 ° ), when the back length L of the slit nozzle and 20 mm (Table 1 case C-2 (example 1)), 45 ° the back inclination angle beta ( θ + β = 90 °), when the back length L of the slit nozzle and 25mm (Table 1 case E-3 (example 6)), the relationship between the thickness of the liquid remaining in the gap h and the steel sheet surface Examined. The results are shown in Figure 12.
[0090]
　As shown in FIG. 12, in the case of Table 1 Case A-1 (Comparative Example 1), the above equation may be varied between 3 - 20 mm gap h (1) is not satisfied to (3). Thus, the nozzle back is turbulent, the thickness of the liquid on the steel sheet surface is not less than 0.5 [mu] m. Meanwhile, Table 1 Case C-2 (Example 1) and Case E-3 in the case of (Example 6), even the formula varied between 3 ~ 20 mm gap h (1) ~ (3 ) is always met, it could be smaller than 0.5μm film thickness of the liquid on the steel sheet surface.
[0091]
　As described above, by making the slit nozzle arrangement of the liquid removal apparatus of the present invention, without causing the quality of the steel sheet surface defects, it was shown that a sufficient draining effect is obtained.
[0092]
　With respect to the front tilt angle alpha, under the same conditions as verification of Figure 11, it was verified by changing only the front inclination angle alpha of the case A ~ F to 35 °. Case G ~ I of FIG. 14 corresponds to the case A ~ F, respectively, in FIG 11. As shown in FIG. 14, the results from the injection angle theta, rear inclination angle beta, the rear length of the nozzle back L, slit width d and the gap h and the nozzle pressure P in FIG. 11 n and the above formula (1) to ( even if satisfying relationship 3), the thickness of the liquid on the surface of the steel sheet becomes more than 0.5 [mu] m, it was not obtained a sufficient draining effect. Therefore, the front tilt angle α desirably set to 30 ° or less.
[0093]
　Having described in detail preferred embodiments of the present invention with reference to the accompanying drawings, the present invention is not limited to such an example. It would be appreciated by those skilled in the relevant field of technology of the present invention, within the scope of the technical idea described in the claims, it is intended to cover various changes and modifications , also such modifications are intended to fall within the technical scope of the present invention.
[0094]
　For example, in the above embodiment, the liquid removal device 1 comprises a slit nozzle 10 is fixed, the case has been described where the steel sheet S is moved relative to the slit nozzle 10 is transported by the transport apparatus, the present invention is but it is not limited to such an example. For example, if a stationary plate member, if the liquid removal apparatus comprising a slit nozzle is relatively moved parallel to the plate-like member by the nozzle moving mechanism also, the liquid removal apparatus of the present invention is applicable .
DESCRIPTION OF SYMBOLS
[0095]
　1 liquid removal device
　10 the slit nozzle
　20 air supply pipe
　30 the gap measuring device
　40 gap adjusting mechanism
　41 drive unit
　51, 53, and 55 support member
　102 nozzle front
　104 nozzle back
　110 gas flow passages
　112,216 injection port
　210 nozzle body
　212 nozzles main body front
　214 nozzle body rear
　220 back member
　S steel

Corrected claims (Convention Article 19)
[July 19, 2017 (19.07.2017) The International Bureau acceptance]
[1]
A [corrected] liquid removal apparatus for removing liquid adhering to the surface of the plate-like member,
　a slit nozzle for ejecting gas from the injection port with respect to the surface of the plate-like member,
　the injection port of the slit nozzle a gap measuring device for measuring the gap between the plate-shaped member
provided with,
　the slit nozzle, toward the downstream side in the movement direction of the plate-like member which moves relative to the slit nozzle to the upstream side gas is installed so as to inject,
　the moving direction of the plate-like member is a horizontal direction,
　the internal gas pressure of the slit nozzle nozzle pressure P n is defined as [KPa],
　the surface of the plate-like member an angle, the injection angle θ is defined as [°], the injection direction of the gas and the direction perpendicular to the
　nozzle back is a surface disposed on the downstream side in the moving direction from the injection port of the slit nozzle When The angle between the injection direction of the serial gas, is defined as the rear angle of inclination beta [°],
　the length of the nozzle back in the moving direction is defined as L [mm],
　defines the gap h [mm] and and,
　when the slit width of the slit nozzle is defined as d [mm],
it satisfies the following relational expression, the liquid removal device.
[Number 1]

[2]
　Further comprising a gap adjusting mechanism for adjusting the gap based on the measurement result of the gap measuring device,
　the gap adjustment mechanism adjusts the gap 20mm or less, the liquid removal device according to claim 1.
[3]
　The gap adjustment mechanism, by changing the position of the slit nozzle, to adjust the gap, the liquid removal device according to claim 2.
[4]
　The plate-like member, the is moved in the movement direction by the table rolls for conveying the plate-like member,
　said gap adjusting mechanism, by changing the position of said table rolls the plate-like member is mounted, said adjusting the gap, the liquid removal device according to claim 2 or 3.
[5]
　The gap measuring device, the gap in the measurement position near both longitudinal ends of the injection port of the slit nozzle was measured,
　the gap adjustment mechanism adjusts the gap in the measurement position to 20mm or less, wherein liquid removal apparatus according to any one of claim 2-4.
[6]
　The gap measuring device is a laser rangefinder, a liquid removal apparatus according to claim 5.
[7]
　The slit nozzle is fixed,
　by being moved in the moving direction by the plate-like member conveying device relatively moves with respect to the slit nozzle, to any one of claims 1 to 6, liquid removal apparatus as claimed.
[8]
　The transport apparatus, the plate-like member is a table roll is mounted, the liquid removal device of claim 7.
[9]
　The transfer device is a winding Tomaki return device comprising a payoff reel to rewind the plate-shaped member wound in a coil shape, and a tension reel the plate-like member in which the liquid has been removed wound into a coil there, the liquid removal device of claim 7.
[10]
　The plate-like member is stationary and
　the slit nozzle is moved relative to the plate-like member by the nozzle moving mechanism, the liquid removal apparatus according to any one of claims 1-8.
[11]
　The slit nozzle,
　said injection port, a nozzle body and a gas flow path for guiding the gas fed from the outside to the injection port,
　the moving direction of the plate-like member from the injection port of the nozzle body a back member having a nozzle back that extends toward the downstream side,
is composed of,
　the nozzle back is a facing surface of the backing member opposite to the surface of the plate-like member, according to claim 1 to 10 liquid removal apparatus according to any one of.
[12]
　Using the liquid removal apparatus according to any one of claims 1 to 11, the plate-like member to a liquid removal process for removing the liquid adhered to the surface of,
　the the injection port of the slit nozzle plate a measurement step of measuring the gap between Jo member by the gap measuring device,
　based on said measured gap, by changing at least one of the positions of the slit nozzle or the plate-like member, said gap a gap adjustment step of adjusting the 20mm or less,
　the slit nozzle and said plate-shaped member from the slit nozzle while relatively moving injecting gas to the surface of the plate-like member, said plate-like member a liquid removal step of removing the liquid adhering to the surface,
including, liquid removal methods.
[13]
　Each time the plate thickness of the plate-like member is changed, the said gap by performing the measuring step and said gap adjustment step is readjusted, the liquid removal process of claim 12.