JP6302701B2 - Valve device for intermittent supply - Google Patents

Description

  The present invention relates to an intermittent supply valve device for intermittently supplying a coating liquid stored in a tank fed from a pump to a web.

  There is an intermittent coating apparatus for intermittently coating a coating liquid on a long web such as film, paper, metal foil, and metal mesh. This intermittent coating apparatus is a valve for intermittent supply between a pump for feeding a coating liquid and a die in order to alternately form a coating part and a non-coating part by a die on a web conveyed on a backup roll. The coating liquid is intermittently supplied to the web by switching the intermittent supply valve.

  2. Description of the Related Art Conventionally, as an intermittent supply valve provided in an intermittent coating apparatus, it has an inlet through which a coating liquid flows, a first outlet and a second outlet through which the coating liquid is sent, and a first outlet and a second outlet. A valve body for opening and closing each of the first outlet and the second outlet is provided at each of the outlets, and a supply pipe for supplying the coating liquid to the die is connected to the first outlet, and the second outlet is connected to the outlet. Connects a circulation pipe for circulating the coating liquid to the tank, opens the first outlet and closes the second outlet in the coating process, closes the first outlet and closes the second outlet in the non-coating process. What was comprised so that it might open is known (for example, refer patent document 1).

JP 2012-47245 A

In intermittent coating of the coating liquid on the web, it is desirable that the thickness change at the start and end of the coating film be as small as possible. In order to minimize the change in thickness at the beginning and end of the coating film, it is necessary to perform the time from the full opening to the full closing of the outlet for supplying the coating liquid to the die and from the full closing to the full opening as short as possible. It is done.
The intermittent supply valve provided in the intermittent coating apparatus disclosed in the above-mentioned Patent Document 1 switches the operation of the valve body provided at the first outlet and the second outlet, thereby preventing the application process from being applied. Since the coating process is performed alternately, in order to minimize the change in thickness at the start and end of the coating film, the first outlet connected to the supply pipe for supplying the coating liquid to the die is opened and closed. The operating time from fully open to fully closed and from fully closed to fully open must be as short as possible, but the speed of the valve body during the opening operation of the valve body and the start of the closing operation is from fully open to fully closed. There has been a problem that it has become a bottleneck in shortening the time from fully closed to fully open.

  The objective of this invention is providing the valve apparatus for intermittent supply which can reduce the change of the thickness in the start end of a coating film as much as possible at the time of switching of a coating process and a non-coating process.

In order to achieve the above object, the invention according to claim 1 is an intermittent supply valve device for intermittently supplying a coating liquid stored in a tank sent from a pump to a web. Is provided with a die supply outlet and a tank return outlet adjacent to the coating liquid inlet on the other side, and at the boundary between the die supply outlet and the tank return outlet , Provided with a gate valve seat having a tip that partitions the boundary, and the valve body traverses between the coating liquid inlet, the die supply outlet and the tank return outlet, and the tip of the gate valve seat A valve body that is slidably in contact with the partitioning direction of the gate valve seat is provided so as to be able to reciprocate in a fluid-tight manner in the direction crossing the partitioning direction of the gate valve seat. Passing through the gate valve seat, the front of the gate valve seat A slit portion that communicates alternately with the die supply outlet and the tank return outlet and allows the coating liquid flowing into the coating liquid inlet to pass therethrough is provided substantially parallel to the tip of the gate valve seat, and further, the valve body A drive means for reciprocating movement is provided.

  According to a second aspect of the present invention, in the valve body according to the first aspect, the slit portion provided in the valve body passes through the tip of the gate valve seat in the vicinity of the fastest time point between the start of movement and the stop of movement. It was made to do.

According to the intermittent supply valve according to claim 1, wherein the boundary of the die supply outlet and the tank return outlet, provided the gate valve seat that the tip of the apex dividing the boundary, to the valve body Crosses the partitioning direction of the gate valve seat across the coating liquid inlet, the die supply outlet, and the tank return outlet and slidably contacts the tip of the gate valve seat. The valve body passes through the gate valve seat in the process of the reciprocating movement of the valve body, and the die supply outlet and the Since the slit portion that is alternately communicated with the tank return outlet and allows the coating liquid flowing into the coating liquid inlet to pass therethrough is provided substantially in parallel with the tip of the gate valve seat, the moving speed of the valve body is increased. At that time, the slit portion passes through the gate valve seat. Therefore, the operation time from full opening to full closing of the valve body and from full closing to full opening can be performed in a short time compared to the conventional intermittent supply valve, and the change in thickness at the start and end of the coating film can be changed. It can be reduced as much as possible.

  According to the valve device for intermittent supply according to claim 2, the valve body according to claim 1 has a slit portion provided in the valve body in the vicinity of the fastest time point between the start of movement and the stop of movement. Since it passes through the tip of the valve seat, the operation time from full opening to full closing of the valve body and from full closing to full opening can be performed in a shorter time than the above-mentioned conventional intermittent supply valve. The change in thickness at the start and end of the film can be further reduced.

It is a schematic block diagram which shows an example of the intermittent coating apparatus provided with the valve apparatus for intermittent supply which concerns on this invention. It is a schematic block diagram which shows an example of embodiment of the valve apparatus for intermittent supply which concerns on this invention. It is a perspective view of the valve body shown in FIG. It is explanatory drawing which shows the correlation with the switching movement speed | rate of the valve body in this example, the position of the slit part of a valve, and the change of the thickness in the starting end (terminal) of the coating film coated on the web. (A)-(D) are explanatory drawings which show switching operation | movement with the slit part of a valve body, and a gate valve seat.

Hereinafter, an example of an embodiment of a valve device for intermittent supply according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of an intermittent coating apparatus provided with an intermittent supply valve device according to the present invention, and FIG. 2 is a schematic configuration diagram showing an example of an embodiment of the intermittent supply valve device according to the present invention. 3 is a perspective view of the valve body shown in FIG. 2, and FIG. 4 is a switching movement speed of the valve body in this example, the position of the slit portion of the valve, and the start end (end) of the coating film applied to the web. FIGS. 5A to 5D are explanatory views showing a switching operation between the slit portion of the valve element and the gate valve seat.

First, an intermittent coating apparatus including the intermittent supply valve device 5 according to the present invention will be described with reference to FIG.
In FIG. 1, it has the tank 2 which supplies the liquid coating liquid 1, and has the liquid feeding piping 3 which sends out the coating liquid 1 to the bottom part of this tank 2. As shown in FIG. In the middle of the liquid feeding pipe 3, a pump 4 that pumps the coating liquid 1 from the tank 2 is provided. An intermittent supply valve device 5 according to the present invention is disposed at the end of the supply pipe 3. Connected to the intermittent supply valve device 5 are a supply pipe 6 for supplying the coating liquid sent from the liquid supply pipe 3 to the die 10 and a return pipe 7 for returning and circulating the coating liquid 1 to the tank 2. Yes. The die 10 is provided with a liquid reservoir portion 10a inside, and the coating liquid supplied to the liquid reservoir portion 10a is applied to the surface of the web 8 conveyed on the backup roll 9 through the slit 10b and is applied to the coating film 1a. Is to be formed.

Next, the intermittent supply valve device 5 according to the present invention will be described with reference to FIGS.
In the intermittent supply valve device 5 of this example, a coating liquid inlet 12 is provided on one side of the valve body 11 and a die supply outlet 13 and a tank communicating with the coating liquid inlet 12 are provided on the other side. A return outlet 14 is provided adjacent to the opening, and a gate valve seat 15 for partitioning the boundary is provided at the boundary between the die supply outlet 13 and the tank return outlet 14.
A liquid supply pipe 3 for feeding the coating liquid 1 from the tank 2 is connected to the coating liquid inlet 12, and a supply pipe 6 for supplying the coating liquid 1 to the die 10 is connected to the die supply outlet 13, so that the tank returns. A return pipe 7 for returning and circulating the coating liquid 1 to the tank 2 is connected to the outlet 14.
The gate valve seat 15 provided at the boundary between the die supply outlet 13 and the tank return outlet 14 is provided in a straight line, and the tip thereof is a pointed portion 15a. In this example, the tip 15a is formed at an acute angle.

Further, the valve body 11 crosses between the coating liquid inlet 12, the die supply outlet 13 and the tank return outlet 14 and is slidably in contact with the tip 15a at the tip of the gate valve seat 15. Is provided penetrating in a fluid-tight manner in a direction crossing the partitioning direction of the gate valve seat 15 . The valve body 11 through which the valve body 16 penetrates in a liquid-tight manner is provided with a seal material 17 that seals between the valve body 11 and the valve body 16 in a liquid-tight manner.

  In addition, the valve body 16 passes over the gate valve seat 15 during the reciprocating movement of the valve body 16, and alternately communicates with the die supply outlet 13 and the tank return outlet 14 across the gate valve seat 15. A slit portion 18 through which the coating liquid 1 flowing into the working liquid inlet 12 passes to the die supply outlet 13 or the tank return outlet 14 is provided in parallel with the tip 15 a of the tip of the gate valve seat 15.

  Furthermore, the drive means 23 which reciprocates the valve body 16 is provided. In this example, the motor 19 is configured to be able to rotate forward and backward, and a motion conversion mechanism 20 that converts the forward and backward rotation of the motor 19 into a reciprocating movement. The motion conversion mechanism 20 includes a pinion 20a that rotates by driving of the motor 19, a rack 20b that meshes with the pinion 20a, and a plate 21 that supports the rack 20b. The plate 21 is connected to the valve body 16 by a connecting plate 22 at connecting portions 21a and 21b.

  In this example, the valve body 16 is formed in a plate shape having a length of 100 mm, a width of 30 mm, and a thickness of 5 mm, and a slit portion 18 having a length of 20 mm and a width of 2 mm is provided in the width direction. The reciprocating stroke length of the valve body 16 is set to 20 mm, and the slit portion 18 is set to pass the pointed portion 15 a at the tip of the gate valve seat 15 at an intermediate position of the reciprocating stroke length, that is, a position of 10 mm. Yes.

In this example, the reciprocating movement of the valve body 16 is performed under the following conditions.
Processing speed: 12m / min
Pinion diameter: 26mm
1-operation pinion rotation angle: 88.20 degrees Valve element movement time: 20 ms (0.02 sec)
Motor rotation speed: 1470rpm

  The driving of the intermittent supply valve device 5 having such a configuration and the operation of the valve body 16 will be described. The intermittent supply valve device 5 is driven between the acceleration section from the start of movement of the valve body 16 (start of rotation of the motor 19) and the deceleration section toward the stop of movement (stop of rotation of the motor 19). The flow paths of the die supply outlet 13 and the tank return outlet 14 are switched through the gate valve seat 15 near the time when the moving speed is the fastest.

Hereinafter, this will be described in detail with reference to FIG.
FIG. 4 shows the change in the moving speed of the valve body 16, the position of the slit portion 18 of the valve body 16, and the change in thickness at the start end 1 b and the end end 1 c of the coating film 1 a applied to the web 8 (from the thickness 0 to normal It is explanatory drawing which shows correlation with the distance L) to thickness. In FIG. 4, the dotted line X indicates the position of the gate valve seat 15. A dotted line Y indicates a switching point between the coating process side and the non-coating process side.

FIG. 4A shows the switching movement speed of the valve body 16. In order to perform the movement of switching the flow path from the state in which the slit portion 18 of the valve body 16 communicates with the tank return outlet 14 (non-coating process) to the state of communication with the die supply outlet 13 (coating process). The motor 19 is rotated forward to move the valve body 16. When the slit portion 18 of the valve body 16 moves across the gate valve seat 15 toward the die supply outlet 13, the rotation of the motor 19 is stopped.
At this time, between the acceleration section Va and the deceleration section Vb of the motor 19 from the rotation start point Ta of the motor 19 to the rotation stop point Tb, the slit portion 18 of the valve body 16 is located near the maximum speed point Vmax. The flow path is switched from the tank return outlet 14 to the die supply outlet 13 through the gate valve seat 15.

To switch from the coating process to the non-coating process, after the coating time has elapsed, the motor 19 that is stopped is reversely rotated to move the valve body 16, and the slit portion 18 of the valve body 16 moves the gate valve seat 15. When it moves across the tank return outlet 14 side, the rotation of the motor 19 is stopped.
At this time, between the acceleration section Va and the deceleration section Vb of the motor 19 from the rotation start point Tc of the motor 19 to the rotation stop point Te, the slit portion 18 of the valve body 16 is located near the maximum speed Vmax between the motor 19 and the deceleration section Vb. The flow path is switched from the die supply outlet 13 to the tank return outlet 14 through the gate valve seat 15.

To switch from the non-coating process to the coating process, after the non-coating time has elapsed, the stopped motor 19 is rotated forward to move the valve body 16, and the slit portion 18 of the valve body 16 moves the gate valve seat 15. The motor 19 stops rotating after moving to the die supply outlet 13 side.
At this time, between the acceleration section Va and the deceleration section Vb of the motor 19 from the rotation start point Te of the motor 19 to the rotation stop point Tf, the slit portion 18 of the valve body 16 is located near the maximum speed Vmax between the motor 19 and the deceleration section Vb. The flow path is switched from the tank return outlet 14 to the die supply outlet 13 through the gate valve seat 15.

  Thus, the coating process and the non-coating process described above are alternately performed by switching the flow path between the die supply outlet 13 and the tank return outlet 14 by the valve body 16.

  In FIG. 4B, the gate valve 15 switches between the coating process and the non-coating process between the start of movement of the valve body 16 (start of rotation of the motor 19) and the stop of movement (stop of rotation of the motor 19). The full opening speed and the full closing speed of the slit portion 18 of the valve body 16 are shown across the switching point Y between the coating process side and the non-coating process side.

  FIG. 4 (C) shows the slit 18 of the valve body 16 shown in FIG. 4 (B) when the coating liquid 1 is applied to the surface of the web 8 for the time of the coating process based on FIG. 4 (A). This shows that the change in thickness at the starting end 1b and the terminal end 1c of the coating film 1a is reduced by the full opening speed and the full closing speed. In this example, the thickness change at the starting end 1b and the terminal end 1c of the coating film 1a The length L in which the occurrence of sag occurs was suppressed to 0.2 mm.

  FIGS. 5A to 5D are explanatory views showing the switching operation between the slit 18 of the valve body 16 and the gate valve seat 15. FIG. 5A shows a non-coating time (closed), and FIG. (C) indicates the end of switching to coating, and (D) indicates the time of opening (open).

DESCRIPTION OF SYMBOLS 1 Coating liquid 1a Coating film 1b Start end 1c End 2 Tank 3 Liquid supply piping 4 Liquid supply pump 5 Intermittent supply valve device 6 Supply piping 7 Return piping 8 Web 9 Backup roll 10 Die 10a Liquid reservoir 10b Slit 11 Valve body DESCRIPTION OF SYMBOLS 12 Coating liquid inlet 13 Die supply outlet 14 Tank return outlet 15 Gate valve seat 15a Point 16 Valve body 17 Sealing material 18 Slit part 19 Motor 20 Motion conversion mechanism 20a Gear 20b Rack 21 Plate 21a, 21b Connection part 22 Connection plate 23 Driving means

Claims (2)

In the intermittent supply valve device for intermittently supplying the coating liquid stored in the tank sent from the pump to the web,
A coating liquid inlet is provided on one side of the valve body, and a die supply outlet and a tank return outlet are provided adjacent to each other on the other side, and the die supply outlet and the tank return outlet are provided. The valve body is provided with a gate valve seat having a pointed end that partitions the boundary, and the valve body traverses between the coating liquid inlet, the die supply outlet, and the tank return outlet, and A valve body that slidably contacts the tip of the gate valve seat is provided so as to be able to reciprocate in a fluid-tight manner in a direction crossing the partition direction of the gate valve seat. A slit that passes through the gate valve seat in the course of movement, alternately communicates with the die supply outlet and the tank return outlet across the gate valve seat, and allows the coating liquid flowing into the coating liquid inlet to pass therethrough. Is provided in parallel with the tip of the gate valve seat, and the front Intermittent supply valve apparatus comprising the driving means for reciprocating the valve element.   2. The intermittent operation according to claim 1, wherein the valve body is configured such that a slit portion provided in the valve body passes through a tip of the gate valve seat in the vicinity of the fastest time point between the start of movement and the stop of movement. Supply valve device.

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