TW201402223A - Web coating device - Google Patents

Abstract

A web coating device capable of forming a coating film on a web in good yield by adjusting a coating position before the start of coating is provided. The coating position can be adjusted by driving a first nozzle horizontal movement mechanism (17) and a second nozzle horizontal movement mechanism (18), during an inactive period of a conveyance mechanism (10) that intermittently conveys the web (W), to move a nozzle (14) in a direction of conveying the web (W) and a direction perpendicular thereto, respectively. Then, the web (W) is lowered by a web vertical movement mechanism and suctioned and fixed on a suction plate (13) by a suction force generation mechanism, so that a horizontal coated surface (P) is formed thereon. On the coated surface (P), a coating film is formed: by supplying coating liquid to the nozzle (14) by a feed mechanism (15); making a bead by discharging the coating liquid from a discharge port of the nozzle (14) that maintains a predetermined coating gap with the upper surface of the web (W); and scanning the first nozzle horizontal movement mechanism (17) in the direction of conveying the web (W) to make the bead follow the nozzle (14).

Description

Stencil coating device

The present invention relates to a screen coating apparatus for applying a coating liquid to a single side of a sheet or film (hereinafter referred to as a stencil) comprising paper, plastic, cloth, metal foil, and the like.

As a conventional stencil coating apparatus, it is disclosed that during the rest period of intermittent conveyance, the stencil is adsorbed and fixed on the adsorption platform, and is kept between the discharge port of the slit die and the upper surface of the stencil. The coating gap is obtained by supplying the coating liquid to the slit die by the feeding mechanism on the one hand, and driving the nozzle horizontal moving mechanism to move the slit die in the conveying direction on the one hand, and forming a coating film on the upper surface of the screen W. (For example, refer to Patent Document 1). The slit die is provided with a slit-shaped discharge port at the lower end thereof, and is disposed such that the longitudinal direction of the discharge port is aligned in a direction orthogonal to the conveying direction of the screen (the width direction of the screen). The length of the discharge port of the slit die is generally set to be shorter than the width of the screen.

In such a stencil coating apparatus, even if it is a flexible stencil, the stencil is stably adsorbed and fixed on an adsorption platform having a hard horizontal surface for coating, and therefore, uniform coating is easily obtained. The film thickness is suitable for intermittent coating in which a coating film is intermittently formed by sandwiching a non-coated portion.

In the coating film having the required thickness, when the coating film thickness is insufficient when the coating is performed once, it is necessary to repeat the coating twice or three times. Further, the same applies to the multilayer coating in which a plurality of different types of coating films are formed.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-45565

Since the operation of attaching the reel of the stencil to the conveying mechanism is manual work, the reproducibility of the positions at both ends in the width direction of the stencil is not easily obtained. Moreover, the dimensions of the rolls between each stencil also have dimensional tolerances. Thus, in the width direction of the screen, the relative position of the discharge port of the slit die to the coated surface of the screen (hereinafter also referred to as the coating position) is shifted.

Since the length of the discharge port of the slit die is shorter than the width of the stencil, in the case where only one layer of the stencil is coated with one layer, as long as the offset of the coating position is small, It won't be too big a problem. However, when repeat coating or multi-layer coating is performed, since the discharge port of the slit die must be superposed with high precision due to the coating film formed on the screen, it is difficult to cause a shift in the coating position. The yield is preferably such that a uniform coating film is obtained. Furthermore, in the case of repeated coating or multi-layer coating, the offset of the coating position may also occur in the conveying direction of the screen.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a screen coating apparatus capable of forming a coating film yield on a screen by adjusting a coating position before application of coating.

The screen coating apparatus of the present invention includes a conveying mechanism, an adsorption platform, an adsorption force generating mechanism, a nozzle, a feeding mechanism, a first nozzle horizontal moving mechanism, and a second nozzle Horizontal moving mechanism and stencil lifting mechanism. The transport mechanism intermittently transports the long webs so as to form a horizontal transport surface. The adsorption platform is disposed below the transfer surface, and adsorbs and fixes the mesh plate. The adsorption force generating mechanism generates an adsorption force on the upper surface of the adsorption platform. The nozzle is disposed above the transfer surface, and includes a discharge port that maintains a predetermined coating gap with the upper surface of the screen, and the coating liquid is discharged from the discharge port. The above feeding mechanism sends the coating liquid to the nozzle. The first nozzle horizontal movement mechanism is configured to horizontally move the nozzle in a conveying direction of the screen. The second nozzle horizontal movement mechanism is configured to horizontally move the nozzle in a direction orthogonal to a conveying direction of the screen. The stencil elevating mechanism is configured to allow the stencil to move up and down between the transfer surface and the adsorption stage.

According to this configuration, the first nozzle horizontal movement mechanism and the second nozzle horizontal movement mechanism can be driven to move the nozzle along the direction in which the screen is conveyed and the direction orthogonal thereto during the pause period in which the screen is intermittently conveyed. And adjust the coating position. Thereafter, the stencil is lowered by driving the stencil lifting mechanism, and the stencil is adsorbed and fixed on the adsorption platform by the adsorption force generating mechanism to form a horizontal coated surface. The coating liquid is supplied to the nozzle by the feeding mechanism, and the coating liquid is ejected from the discharge port of the nozzle which maintains the predetermined coating gap with the upper surface of the screen to form a liquid bead, and the first nozzle level is made along the conveying direction of the screen. The moving mechanism performs scanning, whereby the liquid bead follows the nozzle to form a coating film on the coated surface.

The coating position detecting sensor and the coating position control unit are used in the adjustment of the coating position. The coating position detecting sensor detects the edge of the screen or the edge of the coating film formed on the upper surface of the screen. The coating position control unit individually controls the driving of the conveying mechanism, the first nozzle horizontal moving mechanism, and the second nozzle horizontal moving mechanism based on the detection result of the coating position detecting sensor to adjust the nozzle. initial position.

In such a screen coating apparatus, the reproducibility of the coating gap greatly affects the yield of the coating film thickness. In the present invention, when the coated surface is formed, since the adsorption platform is not moved, the stencil lifting mechanism is used to lower the stencil instead of raising the adsorption platform, so that there is no need to worry about the error of the rising amount of the adsorption platform, and the reproducibility is good. The ground forms a predetermined coating gap.

Moreover, in order to form a smooth and uniform conveying surface, it is necessary to prevent wrinkles in the stencil or to generate air between the stencil and the suction platform when the stencil is adsorbed and fixed to the adsorption platform. Therefore, the stencil raising and lowering mechanism includes a first stencil supporting member, a second stencil supporting member, a first stencil supporting member elevating mechanism, a second stencil supporting member elevating mechanism, and a stencil raising and lowering control unit. Further, the adsorption force generating means has a screen suction force control unit.

The first stencil supporting member is disposed on the upstream side of the adsorption platform in a conveying direction of the stencil of the stencil, and supports the stencil. The second stencil supporting member is disposed on the downstream side of the adsorption platform in a conveying direction of the stencil, and supports the stencil. The first stencil supporting member generates a lifting mechanism to raise and lower the first stencil supporting member. The second stencil supporting member elevating mechanism raises and lowers the second stencil supporting member. The stencil raising and lowering control unit individually controls the first stencil supporting member elevating mechanism and the above by using a time difference so that the stencil located above the absorbing platform gradually descends from the upstream side to the downstream side in the conveying direction The driving of the lifting mechanism of the second stencil support member. The stencil adsorption control unit causes a plurality of adsorption regions to be operated stepwise and additionally in the transport direction of the stencil. The plurality of adsorption regions are regions that are divided along the transport direction of the screen in the adsorption platform.

Moreover, if it is only controlled by the tension of the stencil, it cannot be adsorbed. In a thick stencil having a thickness or a stencil which is likely to be wrinkled and stretchable, the forcing force of pressing the stencil from above may function. Therefore, the screen coating apparatus of the present invention further includes means for scanning a member having a linear pressure parallel to a direction orthogonal to the conveying direction of the screen in the conveying direction of the screen.

The member to which the linear pressure is applied may be a roller that abuts against the upper surface of the screen and is rotatably supported by an axis that is aligned in a direction orthogonal to the conveying direction of the screen.

Alternatively, the member to which the linear pressure is applied may be an air ejection nozzle having a discharge port that maintains a gap with the upper surface of the screen. In this case, in order to change the direction in which the air is ejected, it is more preferable to further include a mechanism for oscillating the air ejection nozzle in the conveying direction of the screen.

According to the present invention, the relative position of the nozzle relative to the coated surface of the screen can be adjusted prior to the start of coating. Therefore, the coating film yield can be preferably formed on the screen.

1‧‧‧ stencil coating device

10‧‧‧Transportation agency

11‧‧‧Departure

12‧‧‧Winding Department

13‧‧‧Adsorption platform

14‧‧‧Nozzles

15‧‧‧Feed institutions

16‧‧‧Nozzle lifting mechanism

17‧‧‧1st nozzle horizontal moving mechanism

18‧‧‧2nd nozzle horizontal moving mechanism

20‧‧‧1st stencil support roller

21‧‧‧2nd stencil support roller

22‧‧‧1st stencil support roller lifting mechanism

23‧‧‧2nd stencil support roller lifting mechanism

24‧‧‧Rack

25‧‧‧ platform

26‧‧‧Sliding parts

27‧‧‧ Coating Position Control Department

28‧‧‧Press roller

29‧‧‧Air ejection nozzle

30‧‧‧Pretreatment device

40‧‧‧Reprocessing device

50‧‧‧Nozzle Management Unit

63‧‧‧Bounce mechanism

64‧‧‧Clamping device

65‧‧‧1st coating position detection sensor

66‧‧‧2nd coating position detection sensor

131‧‧‧1st adsorption zone

132‧‧‧2nd adsorption zone

133‧‧‧3rd adsorption zone

291‧‧‧Shake axis

F‧‧‧Floor

P‧‧‧ coated surface

T‧‧‧Transfer surface

W‧‧‧ stencil

Fig. 1 is a schematic block diagram showing a screen coating apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram showing a nozzle moving mechanism of the screen application device.

Fig. 3 is a schematic block diagram showing another embodiment of the nozzle moving mechanism of the screen application device.

Fig. 4 is a schematic block diagram showing still another embodiment of the nozzle moving mechanism of the screen coating apparatus.

Fig. 5 is a block diagram showing a coating position control system of the screen coating device.

Fig. 6 is a flow chart showing an example of control of the coating position of the screen coating apparatus.

Fig. 7 is a plan view showing a screen of an example of a detection position of a coating position detecting sensor.

8(A) to 8(E) are schematic side views showing main parts of a screen coating apparatus using a control example of a screen lifting control unit and a screen suction control unit.

9(A) to 9(E) are schematic side views showing main parts of a screen coating apparatus for operating a pressing roller.

Fig. 10 (A) to (E) are schematic side views showing main parts of a screen coating apparatus for explaining the operation of the air ejection nozzle.

Fig. 11 is a schematic side view showing a main part of a screen coating device for a mechanism for rocking an air ejection nozzle.

Fig. 1 is a schematic block diagram showing a screen coating apparatus according to an embodiment of the present invention.

The screen coating apparatus 1 of the present invention can be used as a coating apparatus for a roll-to-roll apparatus which performs conveyance by intermittent conveyance, that is, for example, as shown in Fig. 1, the screen W is self-rolled. The outlet portion 301 is taken up, and the cleaning, dusting, surface modification, and the like of the screen W are performed in the pretreatment step. Thereafter, in the coating step, the coating liquid is applied onto the screen W, and thereafter, After the subsequent processing steps of drying, cooling, etc., the web W is taken up by the take-up portion 302 of the take-up mechanism.

Therefore, the coating apparatus 1 of the present invention includes the conveying mechanism 10, the adsorption stage 13, the adsorption force generating mechanism (not shown), the nozzle 14, the feeding mechanism 15, the nozzle lifting mechanism 16, and the first nozzle as shown in Fig. 1 . Horizontal moving mechanism 17, second nozzle horizontal moving mechanism 18, coating position detecting sensors 65, 66, first stencil supporting roller 20, second stencil supporting roller 21, first stencil supporting roller lifting mechanism 22, and The second stencil support roller lifting mechanism 23 comes As the main component.

Further, the screen coating apparatus 1 includes the pretreatment apparatus 30, the post-processing apparatus 40, and the nozzle management unit 50 as a secondary configuration, but is not essential to the present invention.

The pretreatment apparatus 30 is disposed on the upstream side of the main portion of the coating step of the screen coating apparatus 1 with respect to the conveyance direction of the screen W. The pretreatment apparatus 30 performs pretreatment on the coated surface of the screen W before the coating step. For example, cleaning, dust removal, and surface modification.

The post-processing apparatus 40 is disposed on the downstream side of the main portion of the coating step of the screen coating apparatus 1 with respect to the conveying direction of the screen W. The post-processing device 40 performs post-treatment on the screen W after the coating step. For example, drying and cooling are carried out.

The nozzle management unit 50 is secured in the film. The film thickness of the coating film start portion and the coating film end portion in the low-viscosity coating and the intermittent coating is set to be accurate. As an example, the nozzle management unit 50 includes a priming roller, a nozzle tip cleaning device, and a dipping tank (none of which are shown). The liquid amount of the discharge port of the nozzle 14 is adjusted by applying the coating liquid from the discharge port of the nozzle 14 to the surface of the rotating starter roll. The nozzle cleaning device automatically cleans the dirt of the discharge port of the nozzle 14. When the long-term device is stopped, when the device is stopped due to a failure, or during maintenance, when the coating liquid is not supplied to the nozzle 14, the discharge port of the nozzle 14 is dried, and the coating liquid is solidified. However, poor coating may occur or decomposition cleaning of the nozzle may be required. Thereby, the front end of the nozzle 14 can be immersed or the nozzle 14 can be brought close to the upper surface of the liquid by adding a coating liquid or a washing liquid to the immersion tank to prevent drying.

The transport mechanism 10 includes a take-up portion 11 and a take-up portion 12. As an example, the winding portion 11 is formed by winding a long web W in a roll shape. As an example, the winding unit 12 uses a roller to mount the end of the screen W. The winding unit 12 is driven from not shown The mechanism rotates to obtain the rotational force. Thereby, the screen W is taken up to the winding unit 12, and the screen W is transported in the order of the pre-processing step, the coating step, and the post-processing step. The drive mechanism intermittently drives the transport mechanism 10 such that the drive and the stop are alternately repeated at predetermined intervals. That is, the screen W is intermittently transported. The coating step is performed during the rest period of the intermittent driving of the conveying mechanism 10.

The holding device 64 is disposed on the downstream side of the pretreatment device 30 in the conveying direction of the screen W. The pulsating mechanism 63 is disposed on the downstream side of the post-processing device 40 in the conveying direction of the stencil W. The gripping device 64 and the pulsating mechanism 63 are always operated during the intermittent driving period of the transport mechanism 10, and tension is applied to the screen W existing between the two to prevent slack in the screen W during the coating step. . In addition, although the reference numerals are omitted, a driven roller for applying tension to the mesh W and preventing slack during the driving of the transport mechanism 10 is disposed between the winding portion 11 and the winding portion 12. . The stencil W is transported between the coating step and the post-processing step to form a horizontal transfer surface T as shown in FIG.

Next, the configuration of the main part of the coating step of the screen coating apparatus 1 disposed between the pretreatment apparatus 30 and the post-processing apparatus 40 will be described in detail. The frame 24 is horizontally supported on the floor F by the feet and is fixedly set to a predetermined height. A portion of the coating step is disposed on the mount 24.

The adsorption stage 13 is disposed below the transfer surface T. The adsorption platform 13 is fixedly disposed on the mount 24 and has a constant height position. As described below, the screen coating apparatus 1 is such that the screen W is closely attached to the adsorption stage 13, and the stencil raising and lowering mechanism is provided instead of raising the suction platform 13. The adsorption platform 13 is connected to an adsorption force generating mechanism.

An adsorption force generating mechanism (not shown) generates an upper surface of the adsorption platform 13 The adsorption force is preferably a vacuum pump that generates suction adsorption force. The screen W is adsorbed and fixed to the adsorption stage 13 by generating a suction adsorption force on the upper surface of the adsorption platform 13 by means of a vacuum pump. Further, the adsorption force generating means may also use means for generating electrostatic adsorption force.

The adsorption stage 13 has a plurality of (for example, three in the present embodiment) adsorption regions 131 to 133 divided in the transport direction of the screen W (see FIG. 8(C)). The three adsorption regions 131 to 133 are operated by an adsorption force generating mechanism, and the operation is controlled by a screen adsorption control unit (not shown). The three adsorption regions 131 to 133 are controlled such that the transport direction of the screen W is stepwise and additionally operated.

The nozzle 14 is disposed above the transfer surface T. As an example, the nozzle 14 is a slit die having a slit-shaped discharge port. The nozzle 14 is provided in a direction in which the slit-shaped discharge port is parallel to the direction in which the conveying direction of the same screen W is orthogonal (that is, the width direction of the screen W).

As described below, the nozzle 14 is movable in the vertical direction (Z-axis direction) and the conveying direction (X-axis direction) of the screen W. The nozzle 14 is moved over the screen W by the movement of the screen W in the conveying direction (X-axis direction), and the coating liquid discharged from the discharge port is applied to the surface of the screen W. Further, the nozzle 14 forms a predetermined coating gap with the screen W by the movement in the vertical direction (Z-axis direction). The coating liquid sprayed from the discharge port is applied to the screen W by maintaining the coating gap and moving the nozzle 14 in the conveying direction of the screen W. Further, the nozzles 14 may be moved in a direction (Y-axis direction) orthogonal to the conveying direction of the screen W in addition to the two directions.

The feeding mechanism 15 is a method of supplying a coating liquid to the nozzle 14, and includes, as an example, a coating liquid storage tank and a metering pump. Since the dosing pump system can mechanically control the discharge amount of the coating liquid with high precision, the film thickness of the coating film start portion and the coating film end portion can be controlled, and the smart fitting control can be combined. And make the uniformity of the film thickness into one Step up. Even if the coating liquid type or the viscosity of the coating liquid is changed, a coating vehicle (Coat wagon) unit is provided as the coating liquid supply unit, and the coating liquid can be monitored and liquid exchange can be automatically performed. Further, by adding a cleaning liquid to the coating liquid storage tank, it is possible to automatically perform in-pipe cleaning or the like, and various types of piping systems can be combined depending on the application.

2 is a view showing a schematic configuration of a nozzle moving mechanism by a cross section transverse to the conveying surface in a direction orthogonal to the conveying direction. The platform 25 is fixedly disposed on the mount 24 (refer to FIG. 1) and has a constant height position. A nozzle moving mechanism is formed on the platform 25. The nozzle moving mechanism includes a nozzle lifting mechanism 16, a first nozzle horizontal moving mechanism 17, and a second nozzle horizontal moving mechanism 18.

On the platform 25, a gantry type XZ-axis robot is constructed opposite to the direction in which the transport direction of the screen W is orthogonal to the transport path of the screen W. As an example, the robot uses a linear actuator having two axes of orthogonal axes. The nozzle lifting mechanism 16 and the first nozzle horizontal moving mechanism 17 that move the slider 26 of the holding nozzle 14 in the vertical direction (Z-axis direction) and the conveying direction (X-axis direction) of the screen W are respectively realized by the robot. .

Further, the screen coating apparatus 1 includes a mechanism for moving the slider 26 in the two directions, and also includes moving the slider 26 in a direction (Y-axis direction) orthogonal to the conveying direction of the screen W. The second nozzle horizontal movement mechanism 18. In the present embodiment, the second nozzle horizontal movement mechanism 18 is provided between the slider 26 and the nozzle 14. Further, as another embodiment of the second nozzle horizontal movement mechanism shown in FIG. 3, the second nozzle horizontal movement mechanism 18 may be provided between the nozzle elevating mechanism 16 and the first nozzle horizontal movement mechanism 17, or As another embodiment of the second nozzle horizontal movement mechanism shown in FIG. 4, the second nozzle horizontal movement mechanism 18 is provided between the mount 24 and the stage 25.

As an example, the second nozzle horizontal movement mechanism 18 has linearity Actuator, electric actuator, linear motor using air bearing, air pressure. An automatic drive method such as a hydraulic actuator and a manual adjustment method using a feed screw or a push-pull screw.

Referring again to FIG. 1 , the first coating position detecting sensor 65 is disposed on the upstream side of the pretreatment apparatus 30 in the conveying direction of the screen W. The second coating position detecting sensor 66 is disposed on the upstream side of the nozzle 14 in the conveying direction of the screen W. The first coating position detecting sensor 65 and the second coating position detecting sensor 66 are used for detecting the edge of the screen W or the edge of the coating film formed on the upper surface of the screen W. Control of the initial position (coating position) of the nozzle 14. As an example, the coating position detecting sensor may use an image processing sensor, a color recognition sensor, an ultrasonic sensor, a barcode, a laser sensor, and a thermal image sensor.

Figure 5 is a block diagram showing a coating position control system. The coating position control unit 27 individually controls the conveying mechanism 10, the first nozzle horizontal moving mechanism 17, and the second based on the detection signals of the first coating position detecting sensor 65 and the second coating position detecting sensor 66. The nozzle moves horizontally by the mechanism 18. The coating position control unit 27 grasps the position of the nozzle 14.

An example of control for determining the application position by the coating position control unit 27 will be described with reference to the flowchart of Fig. 6 . First, the first coating position detecting sensor 65 detects the edge of the screen W (step S1), drives the conveying mechanism 10, and transports the screen W to the set initial position to perform the coating step (step S2). The second coating position detecting sensor 66 detects the edge of the screen W of the screen W (step S3), and the coating position control unit 27 determines the conveying direction (X-axis direction) of the screen W, and the nozzle 14 Whether the current position is offset from the appropriate position (step S4), and when it is determined that the offset is generated, the first nozzle horizontal moving mechanism 17 is caused to operate, and the nozzle 14 is moved in the direction to perform the positional alignment ( Step S5). Then, the coating position control unit 27 determines that the transfer to the screen W is performed. In the direction orthogonal to the direction (Y-axis direction), whether the current position of the nozzle 14 is offset from the appropriate position (step S6), and when it is determined that the offset is generated, the second nozzle horizontal movement mechanism 18 is caused to operate. The nozzle 14 is moved in this direction for positional alignment.

Such a coating position adjustment system can also be used for the case where the coating film is formed on the uncoated screen W for the first time, but when the screen W on which the coating film has been formed is repeatedly coated or multi-layer coated, it works. In the repeated coating or the multilayer coating, the detection positions of the first coating position detecting sensor 65 and the second coating position detecting sensor 66 are set to the coating film as shown in the plan view of FIG. The edge is not the edge of the stencil W, and the coating position can be adjusted with high precision so that the discharge port of the nozzle 14 is placed at an appropriate position above the coating film.

The configuration of the stencil lifting mechanism will be described with reference to Fig. 1 again. The first stencil supporting roller 20 is located below the conveying surface T, and is disposed on the upstream side of the suction platform 13 so as to be movable up and down in the conveying direction of the stencil W, and supports the stencil W at this position. The second stencil supporting roller 21 is located below the conveying surface T, and is disposed on the upstream side of the suction platform 13 so as to be movable up and down in the conveying direction of the stencil W, and supports the stencil W at this position. The first stencil support roller 20 and the second stencil support roller 21 are examples of the stencil supporting member of the present invention. The first stencil support roller 20 and the second stencil support roller 21 are passively rotated in accordance with the conveyance of the stencil W.

The first stencil supporting roller elevating mechanism 22 is disposed in the vicinity of the first stencil supporting roller 20, and is configured to elevate and lower the first stencil supporting roller 20. The second stencil supporting roller elevating mechanism 23 is disposed in the vicinity of the second stencil supporting roller 21, and is configured to elevate and lower the second stencil supporting roller 21. As an example, the first stencil supporting roller elevating mechanism 22 and the second stencil supporting roller elevating mechanism 23 can preferably use a linear actuator or the like.

The driving of the first stencil supporting roller lifting mechanism 22 and the second stencil supporting roller lifting mechanism 23 is controlled by a stencil lifting control unit (not shown). Stencil lifting control department The first stencil supporting roller lifting mechanism 22 and the second stencil are controlled by a time difference so that the stencil W of the portion located above the suction platform 13 gradually descends from the upstream side in the conveying direction of the conveying direction to the downstream side. Support roller lifting mechanism 23.

A control example using the screen lifting control unit and the screen suction control unit will be described with reference to Figs. 8(A) to 8(E). Although not specifically illustrated, one of the series of operations described below is performed by driving the gripping device 64 and the pulsating mechanism 63, and applying a uniform tension to the stencil W in the conveying direction.

After the above-described coating position adjustment, first, in the state shown in FIG. 8(A), the first screen supporting roller 20 and the second screen supporting roller 21 are both at the same height, and compared with the adsorption platform 13 Support the stencil W for the top. At this time, the height of the stencil W is the same as the height of the transport surface T.

Next, the stencil raising and lowering control unit drives the first stencil supporting roller elevating mechanism 22, and as shown in Fig. 8(B), the first stencil supporting roller 20 is lowered. The amount of drop of the first stencil support roller 20 is set as the difference between the height of the transfer surface T and the upper surface of the adsorption stage 13. At this time, the second stencil support roller 21 is not lowered but is maintained at the initial height. Therefore, the screen W located above the adsorption stage 13 is supported such that the upstream side of the conveying direction of the screen W is lower and the downstream side is inclined as high as shown.

Thereafter, as shown in FIGS. 8(C) to (E), the stencil raising and lowering control unit drives the second stencil supporting roller elevating mechanism 23 to lower the second stencil supporting roller 21. The amount of lowering of the second stencil support roller 21 is set to be the same as that of the first stencil support roller 20.

The stencil adsorption control unit synchronizes the three adsorption regions 131 to 133 formed by dividing the adsorption platform 13 in the transport direction in synchronization with the three periods of the previous, middle, and rear stages in the descending process of the second screen support roller 21. This method operates in a phased and additional manner. In other words, in the preceding stage, only the first adsorption region 131 located on the most upstream side is operated (see the figure). 8(C)), in the middle stage, the second adsorption region 132 located at the center portion is additionally operated (see FIG. 8(D)), and in the subsequent stage, the third adsorption region 133 located on the most downstream side is further added. The action is generated (see Fig. 8(E)).

With such a cooperation between the stencil lifting control unit and the stencil adsorption control unit, in a state where a uniform tension is applied to the stencil W in the conveying direction, the inclination of the stencil W becomes smaller, and the stencil is smaller. The upstream side of the conveying direction of the sheet W gradually adsorbs the screen W to the adsorption stage 13 toward the downstream side. Thereby, wrinkles are generated in the adsorbed web W or air is accumulated between the web W and the adsorption stage 13. As a result, even in the case of the flexible web W, the coated surface P having a level of shape and smoothness can be formed in the same manner as a single-piece workpiece such as a wafer (see FIG. 8(E)). Further, if the opening roller (bow bending roller) is used for the stencil supporting rollers 20, 21, the wrinkles generated in the stencil W can be effectively prevented.

After the coated surface P is formed as described above, the nozzle elevating mechanism 16 is driven to maintain a predetermined coating gap between the discharge port of the nozzle 14 and the coated surface P. Further, the feed mechanism 15 is driven, and a coating liquid (a bead) is formed in the coating gap by a trace amount of the coating liquid discharged from the nozzle 14. Further, by driving the first nozzle horizontal moving mechanism 17, the nozzle 14 is continuously or intermittently scanned at a predetermined distance not exceeding the length of the adsorption stage 13 in the conveying direction of the screen W, and the bead is followed. The movement of the nozzle 14 applies the coating liquid to the coated surface P over the entire surface or intermittently.

In addition to the driving of the time difference of the above-described stencil raising and lowering mechanism and the stepwise and additional operations of the plurality of absorbing regions, a structure in which a force is applied to the stencil W from above and pressed onto the absorbing platform 13 may be provided. For example, a mechanism for scanning a member (a linear pressure parallel to a direction orthogonal to the conveying direction of the same screen W) to the web W attached to the adsorption stage 13 is scanned in the conveying direction of the screen W. As an example of a scanning mechanism, it can be used Linear actuator.

9(A) to (E) illustrate the case where the member to which the linear pressure is applied is a pressing roller. The pressing roller 28 is rotatably supported by a shaft that is aligned in a direction orthogonal to the conveying direction of the screen W. The pressing roller 28 is disposed above the conveying surface T (see FIG. 9(A)), and is lowered by a lifting mechanism (not shown) to a position where it abuts against the upper surface of the screen W supported on the adsorption stage 13. On the other hand, a linear pressing in which the direction orthogonal to the conveying direction of the stencil W is parallel is applied to the stencil W (see FIG. 9(B)). The pressing roller 28 is scanned from the downstream side in the conveying direction of the screen W to the upstream side by the scanning mechanism (not shown), and the pressing roller 28 moves while rotating on the screen W (see FIG. 9(C) to (E)). Further, by using an air pressure type cylinder or the like for the lifting mechanism portion of the pressing roller 28, the pressing by the pressing roller 28 can be arbitrarily set by the change of the internal air pressure, so that the stencil W is not excessively provided. pressure.

Further, FIGS. 10(A) to (E) illustrate a case where the member to which the linear pressure is applied is the air ejection nozzle 29. The air ejection nozzle 29 is disposed above the transfer surface T (see FIG. 10(A)). The air ejection nozzle 29 is a discharge port having a gap between the lower end and the upper surface of the screen W. As an example, the discharge port has a slit shape extending in a direction orthogonal to the conveying direction of the screen W. However, the present invention is not limited thereto, and a plurality of small holes arranged at equal intervals in the direction may be used as the discharge port. . The air ejection nozzle 29 is connected to an air pump that presses air, and the linear air pressure parallel to the direction orthogonal to the conveying direction of the screen W is applied to the screen W by the high-pressure air ejected from the ejection port (refer to Figure 10 (B)). The air discharge nozzle 29 that ejects air is scanned from the downstream side in the conveyance direction of the screen W to the upstream side by the transfer mechanism (not shown) (see FIGS. 10(C) to (E)). Since the air ejection nozzle 29 is scanned without being in contact with the coated surface P, the mesh W is not damaged, and the coating film is not affected during repeated coating or multilayer coating. Further, the effect of removing dust existing on the coated surface P can also be expected. The air utilized by the air jet nozzle 29 The pressure system can be adjusted by a regulator or the like, and the air discharge flow rate can be adjusted by changing the opening width of the slit-shaped discharge port by a flow meter or a shims.

Further, in order to change the direction in which the air is ejected, a mechanism may be provided in which the air ejection nozzle 29 is oscillatably supported by the rocking shaft 291 in a direction orthogonal to the conveying direction of the screen W, as shown in FIG. The air ejection nozzle 29 is caused to move in the conveying direction of the screen W.

As described above, by moving the pressing roller 28 on the screen W or scanning the air ejection nozzle 29 above the screen W, it is possible to thicken the thickness which cannot be adsorbed by the tension control of the screen W alone. The stencil, the stencil which is easy to wrinkle and has elasticity, is uniformly adsorbed on the adsorption platform 13.

In the above embodiment, in the coating step, the nozzle 14 is scanned by the first nozzle horizontal moving mechanism 17 in the conveying direction of the screen W to be applied. Therefore, the nozzle movable amount by the first nozzle horizontal moving mechanism 17 is set to be much larger than the nozzle movable distance of the second nozzle horizontal mechanism 18 for initial position adjustment of the nozzle 14. On the other hand, the platform 25 may be arranged to be orthogonal to the conveying direction of the screen W. Thereby, the nozzle scanning direction in the coating step is reversed at a right angle with respect to the case of the present embodiment. That is, the coating can be performed in a direction orthogonal to the conveying direction of the screen W.

The description of the above embodiments is to be considered in all respects as illustrative The scope of the present invention is expressed by the scope of the patent application, not the above embodiment. Further, it is intended that the scope of the invention includes all modifications within the meaning and scope of the invention.

1‧‧‧ stencil coating device

10‧‧‧Transportation agency

11‧‧‧Departure

12‧‧‧Winding Department

13‧‧‧Adsorption platform

14‧‧‧Nozzles

15‧‧‧Feed institutions

16‧‧‧Nozzle lifting mechanism

17‧‧‧1st nozzle horizontal moving mechanism

18‧‧‧2nd nozzle horizontal moving mechanism

20‧‧‧1st stencil support roller

21‧‧‧2nd stencil support roller

22‧‧‧1st stencil support roller lifting mechanism

23‧‧‧2nd stencil support roller lifting mechanism

24‧‧‧Rack

25‧‧‧ platform

30‧‧‧Pretreatment device

40‧‧‧Reprocessing device

50‧‧‧Nozzle Management Unit

63‧‧‧Bounce mechanism

64‧‧‧Clamping device

65‧‧‧1st coating position detection sensor

66‧‧‧2nd coating position detection sensor

F‧‧‧Floor

T‧‧‧Transfer surface

W‧‧‧ stencil

Claims (10)

The stencil coating apparatus includes: a conveying mechanism that intermittently conveys a long stencil so as to form a horizontal conveying surface; and an adsorption platform disposed below the conveying surface and adsorbing and fixing the stencil An adsorption force generating mechanism that generates an adsorption force on an upper surface of the adsorption platform; a nozzle disposed above the transfer surface and having a discharge port that maintains a predetermined coating gap with the upper surface of the mesh plate, a discharge port ejecting a coating liquid; a feeding mechanism that sends the coating liquid to the nozzle; and a first nozzle horizontal moving mechanism configured to horizontally move the nozzle in a conveying direction of the screen; and the second nozzle moves horizontally The mechanism is configured to horizontally move the nozzle in a direction orthogonal to a conveying direction of the screen, and the screen lifting mechanism is configured to allow the screen to move up and down between the conveying surface and the suction platform. The screen coating apparatus of claim 1, comprising: a coating position detecting sensor that detects an edge of the screen or an edge of a coating film formed on an upper surface of the screen; and The coating position control unit individually controls the driving of the conveying mechanism, the first nozzle horizontal moving mechanism, and the second nozzle horizontal moving mechanism based on the detection result of the coating position detecting sensor to adjust the nozzle initial position. The screen coating apparatus according to claim 1, wherein the stencil lifting mechanism includes: a first stencil supporting member that is vertically movable in a conveying direction of the stencil The upstream side of the adsorption platform supports the mesh plate; the second mesh support member is disposed on the downstream side of the adsorption platform in a direction in which the mesh plate is transported, and supports the mesh plate; the first mesh plate a support member elevating mechanism that elevates and lowers the first stencil supporting member; a second stencil supporting member elevating mechanism that elevates and lowers the second stencil supporting member; and a stencil elevating control unit that is located at the absorbing platform The upper stencil is gradually lowered from the upstream side to the downstream side in the transport direction, and the driving of the first stencil supporting member elevating mechanism and the second stencil supporting member elevating mechanism is individually controlled by the time difference. The stencil coating apparatus according to the second aspect of the invention, wherein the stencil elevating mechanism includes: a first stencil supporting member that is disposed on the upstream side of the adsorption platform in a direction in which the stencil is transported, And supporting the stencil; the second stencil supporting member is disposed on the downstream side of the adsorption platform in a conveying direction of the stencil, and supports the stencil; and the first stencil supporting member lifting mechanism The first stencil support member is lifted and lowered; the second stencil support member elevating mechanism is configured to elevate and lower the second stencil support member; and the stencil elevating control portion is configured to align the stencil located above the absorbing platform The upstream side of the conveying direction is gradually lowered toward the downstream side, and the driving of the first stencil supporting member elevating mechanism and the second stencil supporting member elevating mechanism is individually controlled by the time difference. Such as the stencil coating device of claim 3, wherein The adsorption platform has a plurality of adsorption regions divided along the transport direction of the screen, and the adsorption force generating mechanism includes a screen adsorption control unit, and the screen adsorption control unit transports the plurality of adsorption regions along the screen. The direction moves stepwise and additionally. The stencil coating apparatus of claim 5, further comprising: a member for linearly applying a linear pressure parallel to a direction orthogonal to a conveying direction of the stencil above the stencil in a conveying direction of the stencil Scanning mechanism. The screen coating device of claim 6, wherein the member to which the linear pressure is added is a roller, the roller abuts on an upper surface of the mesh plate, and is orthogonal to a conveying direction of the mesh plate. The axis of the direction is rotatably supported. The screen coating apparatus of claim 6, wherein the member to which the linear pressure is added is an air ejection nozzle having a discharge port that maintains a gap with an upper surface of the screen. The screen coating apparatus of claim 8, further comprising a mechanism for oscillating the air ejection nozzle in a conveying direction of the screen. The screen coating apparatus according to any one of claims 1 to 9, wherein the screen is configured such that the first nozzle horizontal movement mechanism and the second nozzle horizontal movement mechanism are arranged to be the same as the screen The transport direction is orthogonal.