JP7420549B2 - Intermittent coating equipment and intermittent valve - Google Patents

Description

The present invention relates to an intermittent coating device and an intermittent valve used therein.

There is an intermittent coating device that uses a die to intermittently coat coated and uncoated areas of a web of film, paper, metal foil, etc. along the running direction. When performing intermittent coating, an intermittent valve that supplies coating liquid to the die is opened and closed to alternately form coated areas and uncoated areas.

Japanese Patent Application Publication No. 2015-112520

In the above-mentioned intermittent coating equipment, liquid backing of the coating liquid occurs when the discharge port of the intermittent valve is closed, and coating liquid back-up occurs due to insufficient extrusion of the coating liquid when the discharge port is open. There was a problem in that the starting and ending parts of the construction section were shaped like gentle slopes.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an intermittent coating device in which the start and end portions of a coating section are cliff-shaped in intermittent coating, and an intermittent valve used therein.

The present invention provides a die that performs intermittent coating by alternately forming coated areas to which a coating liquid is applied and uncoated areas to which the coating liquid is not applied on a running web; a tank for storing a coating solution; a pump for supplying the coating solution in the tank; a first inlet and a first discharge port; the pump is connected to the first inlet; a first valve that intermittently discharges the coating liquid from a discharge port; a suckback device connected between a supply port for the coating liquid provided in the die and the first discharge port; a control unit for controlling a back device, the suck back device including a cylinder, an inlet for the coating liquid opened on the outer circumferential surface of the cylinder, and an inlet for the coating liquid opened at the front end of the cylinder. and a piston that reciprocates within the cylinder, the inlet is connected to the first discharge port, the outlet is connected to the supply port, and the control section controls the coating section. At the end position, the piston is moved away from the outlet side to suck the coating liquid in the die from the outlet, and at the start position of the coating section, the piston is moved toward the outlet side. This is an intermittent coating device that moves the coating liquid into the die and pushes out the coating liquid from the outlet.

According to the present invention, when finishing coating in the coating section, the piston of the suction device is moved in the direction away from the outlet side to suck the coating liquid inside the die into the cylinder. The final part becomes cliff-like. Further, when starting coating in the coating section, the piston is moved in a direction toward the outlet side to push the coating liquid from the cylinder into the die, so that the starting section of the coating section becomes cliff-like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an intermittent coating apparatus showing Embodiment 1 of the present invention. FIG. 2 is a plan view of a web coated intermittently. It is a schematic explanatory view of the 1st valve|bulb and the 2nd valve|bulb when coating the coating part. It is a schematic explanatory view of the 1st valve|bulb and the 2nd valve|bulb when forming an uncoated part. FIG. 3 is an exploded perspective view of the first valve. FIG. 3 is a vertical cross-sectional view of the first bulb seen from the side. 7 is a cross-sectional view taken along line AA in FIG. 6. FIG. It is a longitudinal cross-sectional explanatory view showing the positional relationship between the first valve body and the first discharge port. FIG. 3 is an explanatory plan view showing the positional relationship between the first valve body and the first discharge port. FIG. 3 is an exploded perspective view of the second valve. FIG. 7 is a longitudinal cross-sectional view of the second bulb seen from the side. 11 is a sectional view taken along line BB in FIG. 10. FIG. FIG. 7 is an explanatory longitudinal cross-sectional view showing the positional relationship between the second valve body and the second discharge port. FIG. 7 is an explanatory plan view showing the positional relationship between the second valve body and the second discharge port. FIG. 3 is a side view of the suckback device. FIG. 2 is a cross-sectional view, with some parts missing, of the suckback device. (a) is a graph showing the relationship between the moving length of the piston and time, (b) is a graph showing the relationship between the opening degree of the first discharge port of the first valve and time, and (c) is a graph showing the relationship between the moving length of the piston and time. It is a state diagram which shows the relationship between the formed coated part and uncoated part.

A rotary first valve 100, a second valve 200, and an intermittent coating apparatus 1 using the same according to an embodiment of the present invention will be described with reference to FIGS. 1 to 17. The intermittent coating device 1 of the present embodiment alternately coats a coated portion 44 and an uncoated portion 46 along the running direction of the web W. , metal foil, metal mesh, etc. In addition, in this specification, "cylindrical shape" is a concept that includes "annular shape" and "ring shape." The intermittent coating device 1 of this embodiment will be explained with reference to FIGS. 1 to 17.

(1) Intermittent coating device 1
The intermittent coating device 1 will be explained with reference to FIGS. 1 and 2. The intermittent coating device 1 includes a backup roll 12, a die 14, a tank 28, a pump 30, a first valve 100, a second valve 200, and a suckback device 300.

As shown in FIG. 1, the web W runs on the right peripheral surface of the backup roll 12 from bottom to top. A die 14 for applying a coating liquid is provided on the right side of the backup roll 12. The die 14 consists of an upper body 16, a lower body 18, and a shim (not shown) sandwiched between them, and the left side of the upper body 16 is formed into a triangular shape that becomes narrower toward the tip. The lower body 18 is also formed into a triangular shape that becomes narrower toward the left side. A liquid reservoir 20 is formed on the upper peripheral surface of the lower body 18. A liquid passage 22 is formed from this liquid reservoir 20 toward the tip of the die 14. That is, the liquid passage 22 is formed between the lower surface of the upper body 16 and the upper surface of the lower body 18. A discharge port 24 is formed at the tip of this liquid passage 22 . This discharge port 24 has a slit shape along the width direction of the web W. A supply port 26 is formed from the liquid reservoir 20 toward the lower surface of the lower body 18 .

The tank 28 stores a coating liquid. The coating liquid stored in the tank 28 is pumped by a pump 30 at a constant rate per unit time. The coating liquid pumped from the pump 30 flows through the branch section 32 into the first branch pipe 34 and the second branch pipe 36 .

The coating liquid supplied to the first branch pipe 34 reaches the first valve 100, which is an intermittent valve. The first valve 100 is in an open state when forming a coated portion 44 on the web W, and is in a closed state when forming an uncoated portion 46 on the web W.

The coating liquid discharged from the first valve 100 flows to the suckback device 300. This suckback device 300 sucks the liquid back of the coating liquid when finishing the coating section 44 on the web W, and also sucks the sucked coating liquid back when starting coating the coating section 44. Push out.

The coating liquid supplied to the second branch pipe 36 reaches the second valve 200. The second valve 200 is closed when forming the coated portion 44 on the web W, and is opened when forming the uncoated portion 46 to circulate the coating liquid in the tank 28 .

The intermittent coating device 1 has a control unit 50 made of a computer, and the control unit 50 includes a roll motor 42 that rotates the backup roll 12, a pump 30, a first motor 130 that drives the first valve 100, and a first motor 130 that drives the first valve 100. A second motor 230 that drives the two-valve 200 and a suckback motor 310 of a suckback device 300, which will be described later, are connected.

(2) First valve 100
The rotary first valve 100 will be explained with reference to FIGS. 3 to 8. The first valve 100 has a cylindrical first valve box 102, as shown in FIG. A disk-shaped first front plate 104 is provided on the surface of the cylindrical first valve box 102 and is closed, and a disk-shaped first back plate 106 is provided on the back surface of the first valve box 102. It's blocked.

A first discharge pipe 108 made of a circular pipe protrudes from the upper part of the outer peripheral surface of the first valve box 102 and is connected to an inlet 306 of the suckback device 300 via a supply pipe 68 . The bottom surface of the first discharge pipe 108 has a circular opening.

As shown in FIGS. 6 and 7, a first valve seat 118 made of a rectangular parallelepiped is provided on the inner circumferential surface of the first valve box 102 at a portion of the first discharge pipe 108. As shown in FIGS. The first valve seat 118 is formed thicker than the first valve box 102, and only M1 of the inner circumferential surface of the first valve seat 118 protrudes from the inner circumferential surface of the first valve box 102 (Fig. 8(c)). As shown in FIGS. 8 and 9, a slit-shaped first discharge port 120 is formed in the axial direction of the first valve seat 118.

As shown in FIG. 5, a circular first inlet 122 is opened on the side of the outer peripheral surface of the first valve box 102. As shown in FIG. When the axial direction of the first valve box 102 is arranged horizontally and the first discharge port 120 is arranged at the top, as shown in FIG. It opens at the same height as the shaft 112. As shown in FIGS. 3 and 4, a first branch pipe 34 is connected to the first inlet 122. Thereby, the coating liquid pumped from the pump 30 is branched at the branch part 32 and supplied to the first valve box 102 of the first valve 100.

A first shaft hole 124 passes through the center of the first back plate 106 . A cylindrical first dynalip seal 126 is provided on the inner circumference of the first shaft hole 124 (see FIG. 6).

A first rotating body 110 is arranged inside the first valve box 102 . As shown in FIG. 5, the first rotating body 110 has a disk shape, and a cylindrical first rotating shaft 112 protrudes from the center. Four fan-shaped first fan openings 114 are provided between the outer peripheral surface of the first rotating body 110 and the first rotating shaft 112. As shown in FIGS. 5 and 7, a first blade 116 whose thickness gradually becomes thinner is formed on one side in the radial direction sandwiched between the outer peripheral surface and the inner peripheral part of the first fan opening 114. Thereby, the first rotating body 110 plays the role of an impeller.

As shown in FIG. 5, a first valve body 140 is attached to the outer peripheral surface of the first rotating body 110. The first valve body 140 has an arc shape when viewed from the front as shown in FIG. 7, and a rectangle when viewed from above as shown in FIG. 9, and extends in the axial direction of the first valve body 102. There is. The radius of the inner circumference of the first valve box 102 is R1 (see FIG. 7), the protrusion dimension of the first valve seat 118 is M1 (see FIG. 8(c)), and the radius of the first rotating body 110 is R2 (see FIG. 7). ), the radial length M2 of the first valve body 140 is M2=R1-R2-M1. Further, the axial length M3 of the first valve body 140 is set to a dimension that can completely close the slit-shaped first discharge port 120 (see FIGS. 9(a) and 9(c)).

A recess 142 is formed on the outer peripheral surface of the first valve body 140 in the axial direction, as shown in FIGS. 5 and 7 to 9. The length M4 in the axial direction of this recessed portion 142 is formed to be slightly larger than the length N of the slit-shaped first discharge port 120 (see FIGS. 9(a) and 9(c)).

As shown in FIGS. 3 and 4, the circumferential length of the first valve body 140, that is, the first arc opening angle θ1 of the first valve body 140 about the first rotating shaft 112 is It is determined by the first rotational speed ω1 of the engine 110 and the closing time for closing the first discharge port 120. This will be explained in detail later.

As shown in FIG. 6, a cylindrical first support portion 128 is provided outside the first back plate 106 at the position of the first shaft hole 124. As shown in FIG. As shown in FIG. 6, a first motor 130 made of a servo motor is attached to this cylindrical first support portion 128. Further, first bearings 134 and 136 are disposed on the inner circumference of the cylindrical first support portion 128, and rotatably support the first drive shaft 132 on which the first motor 130 rotates. The first drive shaft 132 of the first motor 130 passes through the first support portion 128, passes through the first dynalip seal 126 of the first shaft hole 124, and is fixed to the first rotation shaft 112 of the first rotation body 110. has been done. As shown in FIG. 6, the first rotating body 110 rotates as the first drive shaft 132 of the first motor 130 rotates.

A first connection port 138 is provided on the outer peripheral surface of the first valve box 102 at the lowest portion.

(3) Second valve 200
Next, the rotary second valve 200 will be explained with reference to FIGS. 3, 4, and 10 to 14. The second valve 200 has a cylindrical second valve box 202, as shown in FIG. A disk-shaped second front plate 204 is provided on the surface of the cylindrical second valve box 202 to close it off, and a disk-shaped second back plate 206 is provided on the back side of the second valve box 202 to close it off. has been done.

A second discharge pipe 208 made of a circular pipe protrudes from the lower part of the outer peripheral surface of the second valve box 202, and a circulation pipe 40 leading to the tank 28 is connected to the second discharge pipe 208.

As shown in FIGS. 11 and 12, a second valve seat 218 made of a rectangular parallelepiped is provided on the inner peripheral surface of the second valve box 202 at a portion of the second discharge pipe 208. The second valve seat 218 is formed thicker than the second valve box 202, and only m1 of the inner circumferential surface of the second valve seat 218 protrudes from the inner circumferential surface of the second valve box 202 (Fig. 13(a)). As shown in FIGS. 13 and 14, a slit-shaped second discharge port 220 is formed in the axial direction of the second valve seat 218.

As shown in FIG. 10, a circular second inlet 222 is opened on the side of the outer peripheral surface of the second valve box 202. When the axial direction of the second valve box 202 is arranged horizontally and the second discharge port 220 is arranged at the bottom, as shown in FIG. It opens at the same height as the shaft 212. As shown in FIGS. 3 and 4, a second branch pipe 36 is connected to this second inlet 222. As a result, the coating liquid pumped from the pump 30 is branched at the branch portion 32 and supplied to the second valve box 202 of the second valve 200 .

A second shaft hole 224 passes through the center of the second back plate 206 . A cylindrical second dynalip seal 226 is provided on the inner circumference of the second shaft hole 224 (see FIG. 11).

A second rotating body 210 is arranged inside the second valve box 202. As shown in FIG. 10, the second rotating body 210 has a disk shape, and a cylindrical second rotating shaft 212 protrudes from the center. Four fan-shaped second fan openings 214 are provided between the outer peripheral surface of the second rotating body 210 and the second rotating shaft 212. As shown in FIGS. 11 and 12, a second blade 216 whose thickness gradually becomes thinner is formed on one side in the radial direction sandwiched between the outer peripheral surface and the inner peripheral part of the second fan opening 214. Thereby, the second rotating body 210 plays the role of an impeller.

A cylindrical second valve body 240 is provided on the outer peripheral surface of the second rotating body 210, as shown in FIGS. 10 and 12. A notch 242 is formed in a part of this cylindrical second valve body 240 in the axial direction. The outer circumferential surface of the second rotating body 210 in which the cutout portion 242 is formed is cut out in a circular shape, as shown in FIGS. 12 and 13, to form a passage hole 244.

The radius of the inner circumference of the second valve box 202 is r1 (see FIG. 12), the protrusion dimension of the second valve seat 218 is m1 (see FIG. 13(a)), and the radius of the second rotating body 210 is r2 (see FIG. 12). ), the radial length m2 of the second valve body 240 is m2=r1-r2-m1. Further, the length m3 in the width direction of the notch 242 of the second valve body 240 is set to a dimension that allows the slit-shaped second discharge port 220 to be completely opened. The axial length m4 is set to a dimension that allows the length n of the slit-shaped second discharge port 220 to be completely opened (see FIGS. 14(a) and 14(c)).

As shown in FIGS. 3 and 4, the length of the second valve body 240 in the circumferential direction, that is, the second arc opening angle θ2 of the second valve body 240 about the second rotating shaft 212 is It is determined by the second rotational speed ω2 of 210 and the closing time for closing the second discharge port 220. This will be explained in detail later.

As shown in FIG. 11, a cylindrical second support portion 228 is provided outside the second back plate 206 at the position of the second shaft hole 224. As shown in FIG. As shown in FIG. 11, a second motor 230 made of a servo motor is attached to this cylindrical second support portion 228. Further, second bearings 234 and 236 are disposed on the inner periphery of the cylindrical second support portion 228, and rotatably support the second drive shaft 232 on which the second motor 230 rotates. The second drive shaft 232 of the second motor 230 passes through the second support portion 228, passes through the second dynalip seal 226 of the second shaft hole 224, and is fixed to the second rotation shaft 212 of the second rotation body 210. has been done. As shown in FIG. 11, the second rotating body 210 rotates as the second drive shaft 232 of the second motor 230 rotates.

A second connection port 238 is provided at the top of the outer peripheral surface of the second valve box 202. This second connection port 238 is connected to the first connection port 138 provided at the bottom of the first valve 100 through a connection pipe 250.

(4) Suckback device 300
Next, the suckback device 300 will be explained with reference to FIGS. 15 and 16. The suckback device 300 has a cylinder 302, and a coating liquid outlet 304 is opened at the front end of the cylinder 302. A coating liquid inlet 306 is opened on one side of the outer peripheral surface of the cylinder 302 .

The cylinder 302 is attached to a support plate 308 made of a metal plate bent into an L shape. A suckback motor 310 is attached to the rear end of the support plate 308 at a position opposite to the outlet 304 of the cylinder 302. The rotation shaft of this suckback motor 310 passes through the support plate 308, and an eccentric cam 312 is attached thereto.

A linearly movable piston 314 is disposed inside the rear portion of the cylinder 302. A connecting member 322 at the rear end of the piston 314 and the eccentric cam 312 are connected by a rod 316. When the suckback motor 310 rotates, the eccentric cam 312 also rotates, the rod 316 and the connecting member 322 reciprocate accordingly, and the piston 314 reciprocates inside the cylinder 302. Then, when the piston 314 moves in a direction away from the outlet 304, the coating liquid is sucked from the outlet 304. Conversely, when the piston 314 is moved in a direction closer to the outlet 304, the coating liquid inside the cylinder 302 is pushed out.

An omniseal 318 is provided on the outer periphery of the piston 314 to prevent liquid leakage, and an omniseal 320 is also provided on the inner periphery of the cylinder 302 at a portion where the piston 314 moves.

The control unit 50 controls whether the piston 314 approaches or leaves the outlet 304 depending on the rotation direction of the suckback motor 310, controls the moving distance of the piston 314 depending on the rotation angle, and controls the moving speed of the piston 314 depending on the rotation speed. control.

(5) Relationship between the first valve 100 and the second valve 200 Next, the relationship between the first valve 100 and the second valve 200 will be described with reference to FIGS. 2 to 4. Note that the first valve 100 and the second valve 200 are arranged vertically side by side with their axial directions horizontal, and the first discharge port 120 is located at the top and the second discharge port 220 is located at the top. , is attached to a frame (not shown) of the intermittent coating device 1.

FIG. 2 is a plan view of the web W, in which coated portions 44 and uncoated portions 46 are alternately formed along the running direction. The length of the coated portion 44 is L1, and the length of the uncoated portion 46 is L2. In the die 14, it is necessary to prevent the coating liquid from being pumped from the first valve 100 when forming the coated portion 44, and from pumping the coating liquid from the first valve 100 when forming the uncoated portion 46. There is.

FIG. 3 is a schematic explanatory diagram of the first valve 100 and the second valve 200 when forming the coated part 44, and FIG. 4 is a schematic illustration of the first valve 100 and the second valve 200 when forming the uncoated part 46. and a schematic explanatory diagram of a second valve 200.

As shown in FIGS. 3 and 4, when forming the coating portion 44, the first valve body 140 is located at a location other than the first discharge port 120, and the second valve body 240 closes the second discharge port 220. It is necessary to do so. As a result, the coating liquid is sent only from the first valve 100 to the die 14 and does not circulate from the second valve 200 to the tank 28. On the other hand, when forming the uncoated portion 46, the first valve body 140 closes the first discharge port 120 to prevent the coating liquid from flowing into the die 14. Further, the notch 242 of the second valve body 240 rotates to the position of the second discharge port 220, opens the second discharge port 220, and the coating liquid circulates to the tank 28.

The relationship between the running speed V of the web W and the rotational speed (angular speed) ω will be explained. Note that the rotational speed ω1 of the first rotating body 110=the rotational speed ω2 of the second rotating body 210=ω.

While the first rotating body 110 and the second rotating body 210 are rotating by θ2° at a rotational speed ω, the first discharge port 120 is open, the second discharge port 220 is closed, and the coating liquid is 14, and a coating portion 44 is formed. Since the length of the coating part 44 is L1,

Opening time of the first discharge port 120 = Closing time of the second discharge port 220 = Coating time t1 = L1/V (1)

becomes. Since the first rotating body 110 and the second rotating body 210 rotate by θ2° during this coating time t1,

Rotational speed ω=θ2/t1 (2)

becomes. From equations (1) and (2),

L1=θ2×V/ω...(3)

On the other hand, while the first rotating body 110 and the second rotating body 210 are rotating by θ1°, the first discharge port 120 is closed, the second discharge port 220 is opened, and the coating liquid is discharged from the die 14. It is not supplied, and an uncoated portion 46 is formed. Since the length of the uncoated part 46 is L2,

Closing time of first discharge port 120 = Opening time of second discharge port 220 = Uncoated time t2 = L2/V (4)

becomes. Since the first rotating body 110 and the second rotating body 210 rotate by θ1° during this uncoated time t2,

Rotational speed ω=θ1/t2 (5)

From equations (3) and (4),

L2=θ1×V/ω...(6)

becomes. Also,

θ2°=360°−θ1°...(7)

It is. From these equations (1) to (7),

L2=(360×V/ω)-L1...(8)

θ1/θ2=L2/L1...(9)

becomes. When the traveling speed V of the web W is constant and the rotational speed ω of the first rotating body 110 and the second rotating body 210 is increased, from equations (3) and (6), L1 and L2 become proportional to each other. It can be made shorter. Further, the first circular arc opening angle θ1 and the second circular arc opening angle θ2 are determined by the length L1 of the coated portion 44 and the length L2 of the uncoated portion 46 according to equation (9).

(6) Role of the first valve body 140 The first valve body 140 will be explained with reference to FIGS. 7 to 9. The first valve body 140 has a substantially rectangular parallelepiped shape and is elongated in the axial direction. A recess 142 is provided on the outer peripheral surface along the axial direction. On the other hand, the first discharge port 120 penetrates the first valve seat 118 in the axial direction in the form of a slit.

As shown in FIG. 8(c), the first valve seat 118 protrudes from the inner periphery of the first valve box 102 by M1. The outer circumferential surface of the body 140 and the inner circumferential surface of the first valve box 102 are not in contact with each other and can rotate smoothly.

In addition, since the first valve body 140 is long in the axial direction and rotates in a direction to close the first discharge port 120, a slit is formed as shown in FIGS. The shaped first discharge port 120 can be quickly closed and opened. Therefore, the discharge of the coating liquid from the die 14 can be stopped quickly. Furthermore, even if there is a coating liquid that tries to return from the die 14, since the recess 142 is formed on the outer peripheral surface of the first valve body 140, the coating liquid due to this liquid back can be sucked, The edges are difficult to swell.

As shown in FIG. 7, the first rotary body 110 is provided with a first fan opening 114 and has four first blades 116 formed therein. Therefore, the coating liquid that tends to move toward the outer circumference due to the centrifugal force of the rotating first rotating body 110 is guided to the inner circumference by the first vane 116, and the coating liquid in the first valve box 102 is moved to the inner circumference. Can be stirred.

Furthermore, since the first inlet 122 is provided at the lower part of the first front plate 104 as shown in FIG. easily escapes from the first discharge port 120.

Note that in order to set the initial position of the first valve body 140 of the first valve 100, a plate member is inserted through the slit-shaped first discharge port 120, and the first rotating body 110 is rotated. The initial position is the position where the first valve body 140 contacts the plate member and does not rotate any further.

(7) Role of second valve body 240 Next, the second rotating body 210 will be explained with reference to FIGS. 12 to 14. The second valve body 240 of the second rotary body 210 is almost cylindrical, and as shown in FIGS. 13(a) and 13(e), almost blocks the second discharge port 220 in the second valve seat 218. Further, as shown in FIG. 13(c), the second valve seat 218 protrudes by m1 from the inner circumferential surface of the second valve body 202, so that the outer circumferential surface of the second valve body 240 Can rotate without contacting the inner peripheral surface of the

When the notch 242 of the second valve body 240 is located at the second discharge port 220, as shown in FIG. 13(c), the second discharge port 220 opens and the coating liquid can be circulated to the tank 28. At this time, since a circular passage opening 244 is provided on the outer peripheral surface of the second rotary body 210 in the notch 242, the second rotary body 210 does not become an obstacle and the coating liquid is transferred to the second discharge port. 220. On the other hand, since the second discharge port 220 has a slit shape extending in the axial direction, as shown in FIGS. 13(a) to 14(e) and 14(a) to (e), It can be quickly opened and closed at the same time. Therefore, the coating liquid can be drained quickly.

As shown in FIG. 12, the second rotating body 210 is provided with a second fan opening 214 and has four second blades 216 formed therein. Therefore, the coating liquid that tends to move toward the outer circumference due to the centrifugal force of the rotating second rotating body 210 is guided to the inner circumference by the second vane 216, and the coating liquid inside the second valve box 202 is Can be stirred.

Further, as shown in FIG. 12, the second inlet 222 is provided at the lower part of the second top plate 204, so even if air flows into the coating liquid, the air inside the second valve 200 will not flow. It is easy to escape from the second discharge port 220.

Note that, in order to set the initial position of the second valve body 240 of the second valve 200, a plate member is inserted through the slit-shaped second discharge port 220, and the second rotating body 210 is rotated. The initial position is a position where the second valve body 240 contacts the plate member and does not rotate any further.

(8) Role of the suckback device 300 The suckback device 300 sucks the coating liquid using a liquid bag by moving the piston 314 in a direction away from the outlet 304 at the end portion of the coating section 44 . As a result, the end portion of the coating portion 44 becomes cliff-like. Furthermore, by moving the piston 314 in the direction closer to the outlet 304 at the end of the uncoated portion 46, the coating liquid is pushed out to the die 14 by the piston 314, and the starting portion of the coating portion 44 is shaped like a cliff. becomes. This control method will be explained based on FIGS. 15 to 17.

The vertical axis of the graph in FIG. 17(a) is the moving length of the piston 314 in the suckback device 300, and the higher it goes up, the farther it is from the outlet 304, and the horizontal axis is the time t.

The vertical axis of the graph in FIG. 17(b) indicates the opening degree of the first discharge port 120 of the first valve 100, and the horizontal axis indicates the time t.

FIG. 17(c) shows the formation of the coated portion 44 and the uncoated portion 46 on the web W.

In this control, the control unit 50 controls the moving speed of the piston 314 in two stages: a first suction speed v1 and a second suction speed v2 (where v1>v2). Further, the extrusion speed of the piston 314 is also controlled by the first extrusion speed w1 and the second extrusion speed w2 (however, w1>w2).

When the coating portion 44 is formed, the first discharge port 120 of the first valve 100 is in a completely open state.

Next, at time t0, which is near the end of the coating section 44, the first discharge port 120 starts to be closed by the first valve body 140, and at the same time, the suckback device 300 also causes the piston 314 to close the inside of the die 14. Start sucking the coating liquid. In this case, suction is first performed at the first suction speed v1 and then at the second suction speed v2, and the piston 314 is moved by a predetermined movement length L at time t1 when the first discharge port 120 is completely closed ( (state indicated by the solid line in FIG. 16). As a result, the coating state at the end portion of the coating portion 44 becomes cliff-like. The reason for this is that without the suckback device 300, the end portion of the coating portion 44 would have a diagonal shape due to the coating liquid being backed up. However, by sucking the coating liquid forming this oblique shape with the suckback device 300, the end portion of the coating portion 44 becomes cliff-like.

Next, when the uncoated portion 46 is formed, the first discharge port 120 of the first valve 100 is in a completely closed state. Further, the suckback device 300 is not operated.

Next, at time t3 near the end of the uncoated portion 46, the first discharge port 120 starts to open from the completely closed state, and at the same time, the piston 314 is moved toward the outlet 304 at the first extrusion speed w1, then at the extrusion speed w1. 2 extrusion speed w2, and extrusion by the piston 314 is stopped at the same time as time t4 when the first discharge port 120 becomes completely open (state indicated by a two-dot chain line in FIG. 16). As a result, the starting portion of the coating portion 44 has a cliff-like shape. The reason for this is that without the suckback device 300, the coating liquid would be slowly pushed out from the die 14 and the starting portion of the coating portion 44 would have an oblique shape. However, the coating liquid extruded by the suckback device 300 is stacked on the portion that is about to take on the oblique shape, and the starting portion of the coating portion 44 becomes cliff-like.

Further, the suction start time t1 of the piston 314 is provided with a width α1, the suction end time t2 is provided with a width α2, and the extrusion start time t3 is provided with a width β, and the control unit 50 controls these times according to the viscosity of the coating liquid. do. Further, the moving length L of the piston 314 is determined in advance by confirming the amount of liquid back of the coating liquid by experiment (see FIG. 16).

(9) Role of the connecting pipe 250 As described above, the first valve 100 and the second valve 200 are arranged vertically, and the first connecting port 138 at the bottom of the first valve 100 and the second valve 200 A second connection port 238 at the top of the screen is connected with a connection pipe 250. The role of this connecting pipe 250 will be explained.

First, when the coating liquid is supplied from the pump 30 to the first valve 100 and the second valve 200, the coating liquid also accumulates inside the connecting pipe 250.

Next, as shown in FIG. 3, when coating the web W with the coating portion 44, the second discharge port 220 of the second valve 200 is in a closed state, so the second inlet port A portion of the coating liquid flowing in from 222 flows into the first valve 100 through the connecting pipe 250. In the first valve 100, as described above, the coating liquid that has flowed in from the first inlet 122 is discharged from the first discharge port 120, and the coated portion 44 is formed on the web W.

Next, as shown in FIG. 4, when the first discharge port 120 is about to be closed by the first valve body 140, the second discharge port 220 of the second valve 200 is closed by the second valve body 240. Trying to be open. Therefore, even if gravity acts on the coating liquid and the coating liquid flows down from the second discharge port 220 and continues to flow in from the second inflow port 222, the coating liquid inside the connecting pipe 250 will also be affected by gravity. It will flow down. Therefore, even if the coating liquid flows into the first discharge port 120 of the first valve 100 from the first inflow port 122, the coating liquid at the first discharge port 120 will flow down and be discharged into the die 14. The coating liquid being applied is sucked. As a result, the end portion of the coating portion 44 tends to have a cliff-like shape.

Next, as shown in FIG. 3, at the end of the uncoated area 46, the second discharge port 220 is closed by the second valve body 240 of the second valve 200, and the first discharge port of the first valve 100 is closed. The outlet 120 is opened by the first valve body 140. As mentioned above, until now, the coating liquid has flowed down to the second discharge port 220 due to gravity through the first valve 100, the connecting pipe 250, and the second valve 200, but this second discharge port 220 is now in a closed state. As a result, the coating liquid inside the first valve 100, the connecting pipe 250, and the second valve 200 is pushed upward, and is pushed out from the first discharge port 120 toward the die 14. Therefore, the starting portion of the coating portion 44 tends to have a cliff-like shape.

(10) Effects According to the present embodiment, by using the suckback device 300, when forming the coated portion 44 and the uncoated portion 46 on the web W, the start portion and the end portion of the coated portion 44 can be separated. It can be formed into a cliff shape.

Furthermore, by arranging the first valve 100 and the second valve 200 in the vertical direction and connecting them with the connecting pipe 250, the end portion of the coating portion 44 can be made more cliff-like, and conversely, the starting portion of the coating portion 44 can be made more cliff-like. It can be made more cliff-like.

Further, the first rotating body 110 of the first valve 100 and the second rotating body 210 of the second valve 200 are rotated to alternately open and close the first discharge port 120 and the second discharge port 220, thereby coating the web W. The portions 44 and uncoated portions 46 can be formed alternately.

Furthermore, by increasing the rotational speeds of the first rotating body 110 and the second rotating body 210, the length L2 of the uncoated portion 46 can be shortened.

Further, since the first discharge port 120 has a slit shape extending in the axial direction, it can be opened and closed quickly by the first valve body 140. Further, since the first valve body 140 is formed with the recess 142, the coating liquid can be sucked by the liquid back from the die 14, and a raised portion is less likely to be formed at the end of the coating portion 44.

Further, since the second discharge port 220 has a slit shape extending in the axial direction, it can be opened and closed quickly by the second valve body 240.

Further, since the first valve seat 118 of the first valve 100 protrudes from the inner peripheral surface of the first valve box 102, the rotating first valve body 140 does not come into contact with the inner peripheral surface of the first valve box 102. . Further, since the second valve seat 218 of the second valve 200 protrudes from the inner peripheral surface of the second valve box 202, the rotating second valve body 240 does not come into contact with the inner peripheral surface of the second valve box 202. .

Example of change

(1) Example of change 1
In the above embodiment, a rotary valve is used as the intermittent valve, but the present invention is not limited to this, and a direct-acting valve may be used. That is, the valve may be a valve in which a piston having a valve body attached to its tip is reciprocated in a straight line using a voice coil motor or the like to open and close a coating liquid discharge port located on a valve seat of the valve body.

(2) Example of change 2
In the above embodiment, both the suckback device 300 and the connecting pipe 250 suck and extrude the coating liquid, but the suckback device 300 or the connecting tube 250 only sucks and extrudes the coating liquid. You may go.

(3) Others Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 10... Intermittent coating device, 14... Die, 28... Tank, 30... Pump, 50... Control part, 100... First valve, 102... First valve box , 110... first rotating body, 120... first discharge port, 122... first inlet, 130... first motor, 140... first valve body, 200... first 2 valve, 202... second valve box, 210... second rotating body, 220... second discharge port, 222... second inlet, 230... second motor, 240... - Second valve body, 250... Connection pipe, 300... Suckback device, 302... Cylinder, 304... Outlet, 306... Inlet, 308... Support plate, 310... Suck back motor, 312... Eccentric cam, 314... Piston, 316... Rod

Claims (9)

a die that performs intermittent coating by alternately forming coated areas to which a coating liquid is applied and uncoated areas to which the coating liquid is not applied on a traveling web;
a tank for storing the coating liquid;
a pump that supplies the coating liquid in the tank;
a first valve having a first inlet and a first discharge port, the pump is connected to the first inlet, and the coating liquid is intermittently discharged from the first discharge port;
a suckback device connected between the coating liquid supply port provided in the die and the first discharge port;
a control unit that controls the suckback device;
has
The suckback device includes:
cylinder and
an inlet for the coating liquid opened on the outer peripheral surface of the cylinder;
an outlet for the coating liquid opened at the front end of the cylinder;
a piston that reciprocates within the cylinder;
the inlet is connected to the first discharge port, the outlet is connected to the supply port,
The control unit includes:
moving the piston in a direction away from the outlet side at the end position of the coating section to suck the coating liquid in the die from the outlet;
moving the piston in a direction closer to the outlet at a starting position of the coating section to push the coating liquid into the die from the outlet;
Intermittent coating equipment. The suckback device includes:
motor and
an eccentric cam provided on the rotating shaft of the motor;
a rod connected to the rear end of the piston;
the rod and the eccentric cam are connected;
The intermittent coating device according to claim 1. the motor of the suckback device is a servo motor;
The intermittent coating device according to claim 2. The first valve is
a cylindrical first valve box;
the first inlet opening on the outer peripheral surface of the first valve box;
the first discharge port opening on the outer peripheral surface of the first valve box;
a first rotating body rotating within the first valve box;
a first drive unit that rotates the first rotating body;
a first valve body provided on the outer circumferential surface of the first rotating body and closing the first discharge port;
has
The control unit rotates the first rotating body with the first drive unit, places the first valve body at the position of the first discharge port, closes the first discharge port, and applies the first valve body to the web. forming an uncoated portion, or arranging the first valve body at a position other than the first discharge port and opening the first discharge port to form the coated portion in the web;
The intermittent coating device according to claim 1. The control unit includes:
Until the first valve body is rotated to the position of the first discharge port and the first discharge port is completely closed from the fully open state, the piston of the suckback device is not moved from the outlet side. suctioning the coating liquid in the die from the outlet by moving it away from the die;
Until the first valve body is rotated to a position other than the first discharge port and the first discharge port is completely opened from a completely closed state, the piston is moved in a direction closer to the outlet side. to push the coating liquid into the die from the outlet;
The intermittent coating device according to claim 4. The control unit includes:
When moving the piston of the suckback device in a direction away from the outlet side, the piston is moved at a first suction speed, and then moved at a second suction speed slower than the first suction speed,
When moving the piston of the suckback device in a direction closer to the outlet side, the piston is moved at a first extrusion speed and then moved at a second extrusion speed slower than the first extrusion speed.
The intermittent coating device according to claim 5. the first valve is a direct acting valve;
The intermittent coating device according to claim 1. further comprising a second valve, the second valve comprising:
a cylindrical second valve box;
a second inlet that opens on the outer peripheral surface of the second valve box and is supplied with the coating liquid from the pump;
a second discharge port that opens on the outer peripheral surface of the second valve box and circulates the coating liquid in the tank;
a second rotating body rotating within the second valve box;
a second drive unit that rotates the second rotating body;
a second valve body provided on the outer peripheral surface of the second rotating body and closing the second discharge port;
has
The control unit rotates the second rotating body with the second drive unit, disposes the second valve body at the position of the second discharge port, closes the second discharge port, and supplies the coating liquid. do not circulate the coating liquid to the tank, or arrange the second valve body at a position other than the second discharge port to open the second discharge port and circulate the coating liquid to the tank;
When the first valve body opens the first discharge port, the second valve body closes the second discharge port,
When the first valve body closes the first discharge port, the second valve body opens the second discharge port.
The intermittent coating device according to claim 4. the first valve is arranged so that the rotation axis of the first rotating body is horizontal;
A first connection port opens at the lowest part of the outer peripheral surface of the first valve box,
the second valve is arranged so that the rotation axis of the second rotating body is horizontal;
A second connection port opens at the top of the outer peripheral surface of the second valve box,
The second valve is arranged below the first valve,
the first connection port and the second connection port are connected;
The intermittent coating device according to claim 8.

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