CN111093838B

CN111093838B - Intermittent coating device

Info

Publication number: CN111093838B
Application number: CN201880057925.6A
Authority: CN
Inventors: 渡边敦; 横井健太; 上田胜彦
Original assignee: Toray Engineering Co Ltd
Current assignee: Toray Engineering Co Ltd
Priority date: 2017-11-17
Filing date: 2018-10-01
Publication date: 2021-12-14
Anticipated expiration: 2038-10-01
Also published as: CN111093838A; JP6598839B2; WO2019097863A1; KR20200087153A; KR102472016B1; JP2019093313A

Abstract

Provided is an intermittent coating device, which can realize the uniformity of the film thickness of the coating film at the coating starting end even if the coating speed is increased. Specifically, the intermittent coating device (1) of the present invention comprises: a supply unit (10) that supplies a coating liquid (20); a coating section (15) that coats the coating liquid supplied from the supply section onto the surface of the base material (30) through the supply path (21); a supply valve (12) having a valve element (42) that opens and closes a supply path; and a drive unit for driving the valve element, wherein the drive unit is composed of a 1 st cylinder (13) and a 2 nd cylinder (14), the 1 st cylinder controls the opening and closing of the valve element through the reciprocating motion of a 1 st piston (52) connected with the valve element, and the 2 nd cylinder drives a 2 nd piston (62) connected with the valve element to the direction that the 1 st piston closes the valve element.

Description

Intermittent coating device

Technical Field

The present invention relates to an intermittent coating apparatus that intermittently applies a coating liquid to a surface of a continuously conveyed substrate to intermittently form a coated region and an uncoated region.

Background

In a conventional intermittent coating apparatus, as described in, for example, patent document 1, a flow path for discharging a coating liquid supplied from a coating liquid container from a coating die onto a substrate surface and a flow path for recovering the coating liquid into the coating liquid container are switched by two switching valves (supply valve and recovery valve). Thus, while the coating liquid is continuously supplied from the coating liquid container, the coated region and the uncoated region can be intermittently formed on the surface of the continuously conveyed substrate.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2014-188449

Disclosure of Invention

Problems to be solved by the invention

In order to increase the coating area per unit time and improve productivity, it is necessary to increase the discharge amount per unit time of the coating liquid from the coating die and the transport speed of the substrate (i.e., coating speed).

When the substrate transfer speed is increased, in order to form a coated region and an uncoated region at predetermined timings on the surface of a continuously transferred substrate, it is necessary to quickly switch between two switching valves (supply valve and recovery valve), and therefore, it is necessary to increase the drive speed of the switching valves. Therefore, it is preferable to use a cylinder having a response better than that of an electric actuator (e.g., a servo motor) in driving the switching valve.

However, when the switching valve is driven at a high speed using the cylinder, it is difficult to accurately control the air pressure input into the cylinder and the speed in the stroke of the piston connected to the valve body. Therefore, it is difficult to form the coating film formed on the surface of the substrate uniformly in thickness. In particular, at the start of supplying the coating liquid, the valve body is moved to a pressurized state, and thus the discharge amount of the coating liquid from the coating die is increased instantaneously. Therefore, the thickness of the coating film becomes thicker (bulges) at the coating start end portion. However, conventionally, the swelling of the coating film at the coating start end portion, which occurs when the coating speed is increased, has not been considered.

The present invention has been made in view of the above problems, and a main object thereof is to provide an intermittent coating apparatus that drives a switching valve using an air cylinder, and that can make the thickness of a coating film at the coating start end uniform even if the coating speed is increased.

Means for solving the problems

An intermittent coating apparatus of the present invention intermittently applies a coating liquid to a surface of a continuously conveyed substrate to intermittently form a coated region and an uncoated region, the intermittent coating apparatus including: a supply unit that supplies a coating liquid; a coating section that coats the coating liquid supplied from the supply section onto the surface of the base material through the supply path; a supply valve having a valve element for opening and closing a supply passage; and a driving unit configured to drive the valve element, wherein the driving unit includes a 1 st cylinder and a 2 nd cylinder, the 1 st cylinder controls opening and closing of the valve element by reciprocating motion of a 1 st piston connected to the valve element, and the 2 nd cylinder drives the 2 nd piston connected to the valve element in a direction in which the 1 st piston closes the valve element.

Effects of the invention

According to the present invention, it is possible to provide an intermittent coating apparatus that drives a switching valve using an air cylinder, and that can make the thickness of a coating film uniform at the coating start end even when the coating speed is increased.

Drawings

Fig. 1 is a view schematically showing the structure of an intermittent coating apparatus in one embodiment of the present invention.

Fig. 2 is a diagram showing operations of driving the supply valve to open and close by the 1 st and 2 nd cylinders, in which (a) shows an operation of closing the supply valve and (b) shows an operation of opening the supply valve.

Fig. 3 is a side view showing the film thickness of the coating film when the coated area/uncoated area is formed using the intermittent coating apparatus of the present invention.

Fig. 4 is a diagram showing the configuration of the 2 nd cylinder in other embodiments of the present invention, in which (a) shows the action of closing the supply valve and (b) shows the action of opening the supply valve.

Fig. 5 is a diagram showing the structure of a brake mechanism in another embodiment of the present invention, in which (a) shows an action of closing a supply valve, and (b) shows an action of opening the supply valve.

Fig. 6 is a diagram showing the structure of a brake mechanism in another embodiment of the present invention, in which (a) shows an action of closing a supply valve, and (b) shows an action of opening the supply valve.

Fig. 7 is a diagram showing a conventional configuration of a conventional intermittent coating device.

Fig. 8 is a diagram showing operations of driving the supply valve to open and close by a conventional cylinder, in which (a) shows an operation of closing the supply valve, and (b) shows an operation of opening the supply valve.

Fig. 9 is a diagram showing the opening and closing operations of the supply valve and the recovery valve in the conventional intermittent coating, and the film thickness of the coating film when the coating region/the non-coating region is formed by the intermittent coating.

Fig. 10 is a diagram showing the opening and closing operations of the supply valve and the recovery valve in the conventional intermittent coating.

Fig. 11 is a diagram showing the film thickness of the coating film when the coated region/uncoated region is formed by conventional intermittent coating.

Detailed Description

Before the embodiments of the present invention are explained, problems in the conventional intermittent coating apparatus will be explained.

Fig. 7 is a diagram showing a conventional configuration of a conventional intermittent coating apparatus 100.

As shown in fig. 7, the coating liquid 120 stored in the coating liquid container 110 is supplied to the manifold 116 in the coating die 115 by being sent by the pump 111 provided in the middle of the supply path 121. The coating liquid 120 supplied to the manifold 116 is discharged from the slit of the coating die 115 to form a coating film 131 on the surface of the substrate 130.

A supply valve 112 having a valve body for opening and closing the supply path 121 is provided in the supply path 121 between the pump 111 and the coating die head 115. A recovery path 122 connected to the coating liquid container 110 is branched from the supply path 121, and a recovery valve 117 having a valve body for opening and closing the recovery path 122 is provided in the recovery path 122. The valve bodies of the supply valve 112 and the recovery valve 117 are driven by

cylinders

113 and 118, respectively, and the driving is controlled by a control unit 119.

Fig. 8 is a diagram showing an operation of driving the supply valve 112 to open and close by the air cylinder 113, in which fig. 8 (a) shows an operation of closing the supply valve 112 and fig. 8 (b) shows an operation of opening the supply valve 112.

The supply valve 112 has a reservoir 141 and a reservoir 140 with a valve body 142 and a valve seat 143 interposed therebetween, the coating liquid 120 enters the reservoir 141 from the supply path 121, and the coating liquid 120 in the reservoir 140 is discharged from the supply path 121. The cylinder 113 has

pressure chambers

150 and 151 sandwiching a piston 152, and the piston 152 is connected to the valve body 142 via a rod 153.

As shown in fig. 8 (a), the piston 152 moves in the direction opposite to the valve body 142 by supplying the pressure air of the pressure P to the pressure chamber 151. Thereby, the valve body 142 moves integrally with the piston 152 and abuts against the valve seat 143, and the supply valve 112 is closed, and the supply of the coating liquid 120 is stopped.

Next, as shown in fig. 8 (b), the piston 152 is moved in the direction of the valve body 142 by supplying the pressure air of the pressure P to the pressure chamber 150. Thereby, the valve body 142 moves integrally with the piston 152 and separates from the valve seat 143, and the supply valve 112 is opened to start the supply of the coating liquid 120.

The supply of the pressurized air to the

pressure chambers

150 and 151 and the release (or exhaust) of the atmosphere may be performed using, for example, a solenoid valve. In order to accurately control the movement of the piston 152, the pressure P of the pressurized air supplied to the

pressure chambers

150 and 151 is preferably equal in magnitude.

The operation of driving the recovery valve 117 to open and close by the air cylinder 118 is also the same as the operation of the supply valve 112, and therefore, the description thereof is omitted.

Fig. 9 is a diagram showing the opening and closing operations of the supply valve 112 and the recovery valve 117 in the intermittent coating and the film thickness of the coating film when the coating region/the non-coating region is formed by the intermittent coating.

As shown in fig. 9, when the coating region is formed, the supply valve 112 is opened and the recovery valve 117 is closed, and the coating liquid 120 is applied from the coating die 115 onto the surface of the substrate 130 to form the coating region. When the uncoated region is formed, the supply valve 112 is closed and the recovery valve 117 is opened, and the coating liquid 120 is recovered to the coating liquid container 110 through the recovery passage 122.

When the coating region is formed, the pressure of the coating liquid 120 flowing into the supply passage 121 of the coating die head 115 is increased by the movement of the valve body 142 of the supply valve 112 at the start of the supply of the coating liquid 120, and thus the discharge amount of the coating liquid 120 from the coating die head 115 is increased instantaneously. Therefore, as shown in fig. 9, the coating film bulges at the coating start end.

Therefore, in order to eliminate the swelling of the coating film at the coating start end, as shown in fig. 10, there is a method of slightly delaying the timing of closing the recovery valve 117. Accordingly, the pressure of the coating liquid 120 in the supply path 121, which has risen at the start of supply of the coating liquid 120, can be released to the recovery path 122 side, and thus, as shown in fig. 10, the swelling of the coating film at the coating start end portion can be eliminated.

However, when the discharge amount per unit time of the coating liquid 120 from the coating die 115 is increased in order to improve productivity, it is difficult to eliminate the bulge of the coating film at the coating start end portion only by the above-described method. In addition, when the conveying speed of the base material 130 is increased in order to improve productivity, the time for forming the uncoated area (the time for which the supply valve 112 is closed) becomes very short. For example, when the conveying speed of the base material 130 is set to 60 m/min, the time for closing the feed valve 112 is set to 10msec, which is very short, when the length of the uncoated region is set to 10 mm. Therefore, it is difficult to control the timing of closing the recovery valve 117 in synchronization with the timing of opening the supply valve 112.

Therefore, as a method of eliminating the swelling of the coating film at the coating start end, it is considered to reduce the moving speed of the piston 152 of the cylinder 113 when the supply valve 112 is opened in order to suppress the pressure increase of the coating liquid 120 flowing into the supply passage 121 of the coating die head 115 at the time of starting the supply of the coating liquid 120. Therefore, the pressure P of the pressurized air supplied to the pressurizing chamber 150 needs to be lowered.

However, in this case, the pressure P of the pressure air supplied to the pressure chamber 151 when the supply valve 112 is closed is set to be lower than the pressure P of the pressure air supplied to the pressure chamber 151 when the supply valve 112 is closed₁And the pressure P of the pressurized air to be supplied to the pressurizing chamber 150 when the supply valve 112 is opened₂Become different sizes (P)₁＞P₂). Therefore, when the switching between the supply of the pressurized air to the

pneumatic chambers

150 and 151 and the release of the atmospheric air is continued, the pressure P of the pressurized air supplied to the

pneumatic chambers

150 and 151 is set to be the pressure P₁、P₂A pressure difference is generated therebetween, and thus the reciprocating motion of the piston 152 becomes unstable. The reciprocating operation of the piston 152 becomes unstable due to, for example, residual pressure in the

pneumatic chambers

150 and 151 at the time of switching, pressure loss in the pipe from the solenoid valve to the

pneumatic chambers

150 and 151, and the like.

Therefore, when the moving speed of the piston 152 of the cylinder 113 when the supply valve 112 is to be opened is reduced, the bulge of the coating film at the coating start end can be eliminated as shown in fig. 11, but the film thickness shape of the coating film becomes unstable. As a result, the length L of the coating region₁、L₂、L₃A deviation is generated.

Therefore, as a means for reducing the moving speed of the piston of the cylinder to be provided when the valve is opened, the present inventors (or the like) conceived to add a cylinder that applies a load in a direction opposite to the moving direction of the piston of the cylinder to a cylinder that drives the valve body of the provided valve as a brake cylinder, and conceived the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. In addition, changes can be made as appropriate within a range not departing from the effect of the present invention.

Fig. 1 is a view schematically showing the structure of an intermittent coating apparatus according to an embodiment of the present invention. The intermittent coating apparatus in the present embodiment is an apparatus that intermittently applies a coating liquid to the surface of a continuously conveyed substrate to intermittently form a coated region and an uncoated region.

As shown in fig. 1, the intermittent coating apparatus 1 according to the present embodiment includes: a coating liquid container (supply unit) 10 that supplies a coating liquid 20; a coating die head (coating section) 15 for coating the coating liquid 20 supplied from the coating liquid container 10 onto the surface of the substrate 30 through a supply path 21; a supply valve 12 having a valve body for opening and closing the supply passage 21; and a drive unit that drives the valve body. The driving unit in the present embodiment is constituted by the 1 st cylinder 13 and the 2 nd cylinder 14. The driving of the 1 st cylinder 13 is controlled by the control unit 19.

The coating liquid 20 contained in the coating liquid container 10 is supplied to the manifold 16 in the coating die 15 by being sent by the pump 11 provided in the middle of the supply path 21. The coating liquid 20 supplied to the manifold 16 is discharged from the slit of the coating die 15 to form a coating film 31 on the surface of the substrate 30.

A recovery path 22 connected to the coating liquid container 10 branches from the middle of the supply path 21, and a recovery valve 17 having a valve body for opening and closing the recovery path 122 is provided in the recovery path 22. The valve body of the recovery valve 17 is driven by the cylinder 18, and the driving is controlled by the control unit 19.

Fig. 2 is a diagram showing an operation of driving the supply valve 12 to open and close by the 1 st and 2

nd cylinders

13 and 14, in which fig. 2 (a) shows an operation of closing the supply valve 12 and fig. 2 (b) shows an operation of opening the supply valve 12.

The supply valve 12 has a reservoir 41 and a reservoir 40 with a valve body 42 and a valve seat 43 therebetween, and the coating liquid 20 enters the reservoir 41 from the supply path 21 and the coating liquid 20 in the reservoir 40 is discharged from the supply path 21.

The 1 st cylinder 13 has

pressure chambers

50, 51 sandwiching a 1 st piston 52, and the 1 st piston 52 is connected to the valve body 42 via a rod 53. Here, the 1 st cylinder 13 controls opening and closing of the valve body 42 by reciprocating operation of the 1 st piston 52 coupled to the valve body 42.

The 2 nd cylinder 14 is disposed on the same side as the 1 st cylinder 13 with respect to the supply valve 12. Here, two 2 nd cylinders 14 having the same configuration are arranged in parallel on both sides of the 1 st cylinder 13.

The 2 nd cylinder 14 has pressure-

air chambers

60, 61 sandwiching a 2 nd piston 62, and the 2 nd piston 62 is connected to the valve body 42 via a rod 63. Here, the rod 63 is coupled to the rod 53 of the 1 st cylinder 13 to be integrated with the rod 53, thereby being coupled to the valve body 42.

As shown in fig. 2 (a), the 1 st piston 52 moves in the direction opposite to the valve body 42 by supplying the pressure air of the pressure P to the pressure chamber 51 of the 1 st cylinder 13. Thereby, the valve body 42 moves integrally with the 1 st piston 52 and abuts against the valve seat 43, and the supply valve 12 is closed to stop the supply of the coating liquid 20.

On the other hand, the pressure air of the constant pressure P is always supplied to the pressure chamber 61 of the 2 nd cylinder 14. Therefore, in the 2 nd cylinder 14, the 2 nd piston 62 coupled to the valve body 42 always drives the 1 st piston 52 in a direction to close the valve body 42.

Here, the driving force F based on the piston is determined by the product of the pressure P of the pressure air supplied to the pneumatic chamber and the surface area of the piston, and in the present embodiment, the driving force F of the 1 st piston 52 in the 1 st cylinder 13₁Set to be larger than the driving force F of the 2 nd piston in the 2 nd cylinder 14₂Sum (2F)₂) Is large.

For example, in the case where the pressure P of the pressure air supplied to the compression chamber 51 of the 1 st cylinder 13 and the pressure P of the pressure air supplied to the compression chamber 61 of the 2 nd cylinder 14 are set to the same magnitude, F can be satisfied by defining the surface area of the 2 nd piston 62 with respect to the surface area of the 1 st piston 52₁＞2F₂The relationship (2) of (c).

Next, as shown in fig. 2 (b), the 1 st piston 52 is driven by the driving force F by supplying the pressure air of the pressure P to the pressure chamber 50 of the 1 st cylinder 13₁And moves in the direction of the spool 42. As a result, the valve body 42 moves integrally with the piston 52 and moves away from the valve seat 43, the supply valve 12 is opened, and the supply of the coating liquid 20 is started.

In the present embodiment, the driving force F of the 1 st piston 52₁While the valve body 42 is driven in the opening direction, a driving force F is applied in the direction of closing the valve body 42 by the 2 nd piston 62₂. That is, the driving force F by the 2 nd piston 62 in the direction opposite to the direction in which the 1 st piston 52 moves to open the valve body 42 is set to be the driving force F₂And a certain braking state is applied. This can reduce the moving speed of the 1 st piston 52 when the valve body 42 is opened. As a result, as shown in fig. 3, at the start of the supply of the coating liquid 20, the rise in pressure of the coating liquid 20 flowing into the supply passage 21 of the coating die 15 can be suppressed, and thus the swelling of the coating film at the coating start end can be eliminated.

In the present embodiment, the pressure P of the pressure air supplied to the pneumatic chamber 51 when the supply valve 12 is closed and the pressure P of the pressure air supplied to the pneumatic chamber 50 when the supply valve 12 is opened are set to the same value, and therefore, even if switching between supply of the pressure air to the

pneumatic chambers

50 and 51 and release of the atmospheric air is continued, the reciprocating operation of the 1 st piston 52 can be stably performed. Therefore, as shown in fig. 3, the length L of the application region can be stably formed.

In the present embodiment, as shown in fig. 2 (a), the driving force F of the 1 st piston 52 is applied₁While the valve body 42 is driven in the closing direction, a driving force F is also applied to the 2 nd piston 62 in the direction of closing the valve body 42₂. Therefore, although the moving speed of the 1 st piston 52 is increased when the valve body 42 is closed, it acts in a direction to quickly stop the supply of the coating liquid 20 to the coating die 15, and therefore, variation in the film thickness of the coating film is not affected.

In addition, in the present embodiment, since the pressure air of the constant pressure P is always supplied to the pressure chamber 61 of the 2 nd cylinder 14, the 1 st piston 52 can be stably reciprocated.

Fig. 4 is a diagram showing the configuration of the 2 nd cylinder 14 in another embodiment of the present invention, in which fig. 4 (a) shows the action of closing the supply valve 12, and fig. 4 (b) shows the action of opening the supply valve 12.

As shown in fig. 4, the 2 nd cylinder 14 in the present embodiment is disposed on the opposite side of the supply valve 12 from the 1 st cylinder 13. The 2 nd piston 62 is directly connected to the valve body 42 via a rod 63. Further, the axial center of the rod 63 preferably coincides with the axial center of the rod 53 of the 1 st cylinder 13.

The pressure air of the constant pressure P is always supplied to the pressure air chamber 61 of the 2 nd cylinder 14. Therefore, in the 2 nd cylinder 14, the 2 nd piston 62 coupled to the valve body 42 is always driven in a direction in which the 1 st piston 52 closes the valve body 42. Therefore, as shown in fig. 4 (b), the driving force F by the 2 nd piston 62 is set in a direction opposite to the direction in which the 1 st piston 52 moves to open the valve body 42₂And a certain braking state is applied. This can reduce the moving speed of the 1 st piston 52 when the valve body 42 is opened. As a result, at the start of the supply of the coating liquid 20, the pressure rise of the coating liquid 20 flowing into the supply passage 21 of the coating die 15 can be suppressed, and therefore the coating start end can be eliminatedSwelling of the coating film of the section.

While the present invention has been described above with reference to preferred embodiments, the description is not intended to be limiting, and various modifications may be made. For example, in the above embodiment, as shown in fig. 1, two 2 nd cylinders 14 are disposed in parallel with both sides of the 1 st cylinder 13, but one 2 nd cylinder 14 may be disposed in parallel with one side of the 1 st cylinder 13. In this case, it is preferable to increase the rigidity of the rod 53 of the 1 st cylinder 13 and the rod 63 of the 2 nd cylinder 14.

In the above embodiment, the pressure P of the pressurized air supplied to the

pneumatic chambers

50 and 51 of the 1 st cylinder 13 and the pressure P of the pressurized air supplied to the pneumatic chamber 61 of the 2 nd cylinder 14 are set to the same value, but the driving force F for driving the 1 st piston 52 in the direction to open the valve body 42 may be set to the same value₁Driving force F for driving the valve body 42 in a direction to close the valve body 42 more than the 2 nd piston 62₂The large manner sets the pressure of the pressure air supplied to the

blank chambers

50, 51 of the 1 st cylinder 13 and the pressure of the pressure air supplied to the blank chamber 61 of the 2 nd cylinder 14, respectively.

In the above embodiment, the configuration in which the pressurized air of the constant pressure P is always supplied to the compressed air chamber 61 of the 2 nd cylinder 14 is exemplified. Thus, the driving force F can be adjusted₂Remains constant and is therefore preferred. However, in an aspect embodying the present invention, the supply of the pressure air to the compressed air chamber 61 of the 2 nd cylinder 14 and the supply of the pressure air to the compressed air chambers 50 and 51 (i.e., the driving of the 1 st cylinder 13) may be performed in conjunction with each other. In this case, while the 1 st cylinder 13 is driven, the 2 nd cylinder 14 is driven in a direction to close the valve body 42.

Alternatively, the supply of the pressure air to the pneumatic chamber 61 of the 2 nd cylinder 14 and the supply of the pressure air to the pneumatic chamber 50 may be performed in conjunction with each other. In this case, while the 1 st cylinder 13 is driven in the direction to open the valve body 42, the 2 nd cylinder 14 is driven in the direction to close the valve body 42 and a certain brake is applied.

In the above embodiment, as means for reducing the moving speed of the 1 st piston 52 when the supply valve 12 is opened, the 2 nd cylinder 14 applying a load in the direction opposite to the moving direction of the 1 st piston 52 is added as a brake cylinder to the 1 st cylinder 13 driving the valve body 42 of the supply valve 12, but, for example, as shown in fig. 5 (a) and (b), a rod 63 may be connected to both sides of the rod 53 operating in conjunction with the valve body 42, and a brake mechanism 70 for applying a constant reaction force to the rod 63 may be provided to the rod 63. Specifically, the brake mechanism 70 can be configured by attaching a plate 71 to the distal ends of the pair of rods 63, and disposing friction pads 72 at positions sandwiching the plate 71.

As shown in fig. 5 (a), when the 1 st piston 52 is driven in a direction to close the valve body 42, the friction pad 72 is separated from the plate 71, and therefore no frictional force (braking) acts on the rod 63.

On the other hand, as shown in fig. 5 (b), when the 1 st piston 52 is driven in the direction to open the valve body 42, the friction pad 72 presses the plate 71, and the frictional force R is applied to the rod 63 in the direction opposite to the direction to move in the direction to open the valve body 42.

In this case, the 1 st piston 52 is driven by the driving force F in the direction of opening the valve body 42₁The frictional force R is set to be larger than the frictional force R applied to the rod 63 that operates in conjunction with the valve body 42. As a result, a certain brake is applied in a direction opposite to the direction in which the 1 st piston 52 moves in the direction to open the valve body 42 by the frictional force R applied to the rod 63. This can reduce the moving speed of the 1 st piston 52 when the valve body 42 is opened.

Since the frictional force R by the braking mechanism 70 does not change due to the displacement of the valve body 42 (the moving distance of the rod 63), a certain braking force can be applied in the direction opposite to the direction in which the 1 st piston 52 moves to open the valve body 42.

Fig. 6 (a) and (b) are diagrams showing other examples of the brake mechanism, in which fig. 6 (a) shows an operation of closing the supply valve 12 and fig. 6 (b) shows an operation of opening the supply valve 12.

As shown in fig. 6 (a) and (b), a rod 81 that reciprocates in conjunction with the valve body 42 is connected to the valve body 42 on the side opposite to the 1 st cylinder 13, and a cushion member 80 is provided at the tip of the rod 81, whereby a brake mechanism can be configured.

As shown in fig. 6 (b), when the 1 st piston 52 is driven in a direction to open the valve body 42, the cushioning material 80 is compressed by the rod 81, and a reaction force R acts on the rod 81 in a direction opposite to the direction to open the valve body 42. As shown in fig. 6 (a), when the 1 st piston 52 is driven in the direction to close the valve body 42, the cushion material 80 is not compressed by the rod 81, and therefore, no brake is applied to the rod 81.

Description of the reference symbols

1: an intermittent coating device; 10: a coating liquid container (supply section); 11: a pump; 12: providing a valve; 13: a 1 st cylinder; 14: a 2 nd cylinder; 15: a coating die (coating section); 16: a manifold; 17: a recovery valve; 18: a cylinder; 19: a control unit; 20: coating liquid; 21: providing a path; 22: a recovery path; 30: a substrate; 31: coating a film; 40. 41: a reservoir; 42: a valve core; 43: a valve seat; 50. 51: a compression chamber; 52: 1 st piston; 53: a rod; 60. 61: a compression chamber; 62: a 2 nd piston; 63: a rod; 70: a brake mechanism; 71: a plate; 72: a friction pad; 80: a cushioning material (brake mechanism).

Claims

1. An intermittent coating device which intermittently coats a coating liquid on the surface of a continuously conveyed substrate to intermittently form a coating area and an uncoated area,

the intermittent coating device comprises:

a supply unit that supplies the coating liquid;

a coating section that coats the coating liquid supplied from the supply section onto the surface of the base material through a supply path;

a supply valve having a valve body for opening and closing the supply passage; and

a drive unit that drives the valve element,

the driving part is composed of a 1 st cylinder and a 2 nd cylinder,

the 1 st cylinder controls the opening and closing of the valve core through the reciprocating motion of the 1 st piston connected with the valve core,

the 2 nd cylinder drives the 2 nd piston connected to the valve body in a direction in which the 1 st piston closes the valve body,

during the period that the 1 st piston opens the valve core, the direction of the driving force of the 1 st piston is opposite to the direction of the driving force of the 2 nd piston.

2. The intermittent coating apparatus according to claim 1,

the 2 nd cylinder is disposed on the same side as the 1 st cylinder with respect to the supply valve,

the 2 nd piston is coupled to the 1 st piston.

3. The intermittent coating apparatus according to claim 2,

the 2 nd cylinder is disposed in parallel with two cylinders on both sides of the 1 st cylinder.

4. The intermittent coating apparatus according to claim 1,

the pressures of the pressurized air input to the 1 st cylinder and the 2 nd cylinder are set so that the driving force of the 1 st piston in the direction of opening the valve body is larger than the driving force of the 2 nd piston in the direction of closing the valve body.

5. The intermittent coating apparatus according to claim 1,

the 2 nd cylinder is disposed on the opposite side of the 1 st cylinder with respect to the supply valve,

the 2 nd piston is directly coupled to the spool.

6. The intermittent coating apparatus according to claim 1,

in the 1 st cylinder, the pressure of the pressurized air input when the valve element is driven in the direction of opening and the pressure of the pressurized air input when the valve element is driven in the direction of closing are set to the same value.

7. An intermittent coating device for intermittently applying a coating liquid on a surface of a continuously supplied base material to continuously form a coating pattern having a predetermined length,

the intermittent coating device comprises:

a supply unit that supplies the coating liquid;

a cylinder that drives the valve element,

the cylinder controls the opening and closing of the valve element by the reciprocating motion of a piston connected to the valve element,

a rod which is linked with the valve core to perform reciprocating motion is connected to the valve core on the side opposite to the cylinder,

the rod is provided with a braking mechanism that applies a certain frictional force to the rod that operates in conjunction with the valve element when the piston is driven in a direction to open the valve element.

8. The intermittent coating apparatus according to claim 7,

the driving force of the piston driving the valve body in the direction of opening the valve body is set to be larger than the frictional force applied to the rod operating in conjunction with the valve body.