JP2013150946A - Web coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web coating apparatus capable of forming a coating film on a web with a high yield by adjusting a coating position before the start of coating.SOLUTION: A coating position can be adjusted by driving a first nozzle horizontal moving mechanism 17 and a second nozzle horizontal moving mechanism 18 to move a nozzle 14 in a conveying direction of a web W and in a direction orthogonal to the conveying direction in a resting period of a conveying mechanism 10 for intermittently conveying the web W. A web lifting mechanism is then driven to lower the web W, and the web W is suction-fixed onto a suction surface table 13 by a suction force generating mechanism to form a horizontal coated surface P. A coating liquid is supplied to the nozzle 14 by a feed mechanism 15, and the coating liquid is ejected from an ejection port of the nozzle 14 maintaining a predetermined coating gap to the upper face of the web W, to form a bead. The first nozzle horizontal moving mechanism 17 is then allowed to scan in the conveying direction of the web W. The bead thereby follows the nozzle 14 to form a coating film on the coated surface P.

Description

  The present invention relates to a web coating apparatus for coating a coating liquid on one side of a sheet or film (hereinafter referred to as a web) made of paper, plastic, cloth, metal foil, and a laminate thereof.

  As a conventional web coating device, the web is sucked and fixed on the suction surface plate during the intermittent conveyance pause period, and a predetermined coating gap is maintained between the discharge port of the slit die and the upper surface of the web. A coating film is formed on the upper surface of the web W by driving the nozzle horizontal movement mechanism while supplying the coating liquid to the slit die and moving the slit die in the transport direction (for example, patents). Reference 1). The slit die has a slit-like discharge port at its lower end, and is arranged so that the longitudinal direction of the discharge port is oriented in a direction (web width direction) perpendicular to the web conveyance direction. The length of the discharge port of the slit die is generally set shorter than the width of the web.

  In such a web coating apparatus, even a flexible web is applied by stably adsorbing and fixing the web on an adsorption surface plate having a hard horizontal surface, so that it is easy to obtain a uniform coating film thickness. It is suitable for intermittent coating in which a coating film is intermittently formed across a non-coating portion.

  In the case of a coating film that requires a thickness, if the coating film thickness is insufficient with a single coating, it is necessary to perform repeated coating twice and three times. The same applies to a multi-layer coating in which different types of coating films are formed in multiple layers.

JP 2009-45565 A

  Since the work of setting the web roll on the transport mechanism is a manual work, it is difficult to obtain reproducibility of the both ends of the web in the width direction. There are also dimensional tolerances for each roll of web. As a result, the relative position of the discharge port of the slit die with respect to the web application surface in the width direction of the web (hereinafter also referred to as application position) may occur.

  The length of the slit die outlet is shorter than the width of the web, so in the case of single-layer coating in which only one layer is applied to one roll of the web, as long as the deviation of the application position is small, there is no problem. Absent. However, when performing overcoating or multi-layer coating, it is necessary to accurately overlay the slit die discharge port on the coating film already formed on the web. It becomes difficult to obtain a film with a high yield. In addition, in the case of performing overcoating or multi-layer coating, deviation of the application position can also occur in the web conveyance direction.

  The present invention has been made in view of the above-described conventional problems, and provides a web coating apparatus capable of forming a coating film on a web with high yield by adjusting the coating position before the start of coating. With the goal.

  The web coating apparatus of the present invention includes a transport mechanism, an adsorption surface plate, an adsorption force generation mechanism, a nozzle, a feeding mechanism, a first nozzle horizontal movement mechanism, a second nozzle horizontal movement mechanism, and a web lifting mechanism. The conveyance mechanism intermittently conveys a long web so as to form a horizontal conveyance surface. The suction surface plate is disposed below the transport surface, and the web is sucked and fixed. The suction force generation mechanism generates a suction force on the upper surface of the suction surface plate. The nozzle is disposed above the transport surface, has a discharge port that maintains a predetermined coating gap with the upper surface of the web, and discharges the coating liquid from the discharge port. The feeding mechanism feeds the coating liquid to the nozzle. The first nozzle horizontal movement mechanism is configured to be able to move the nozzle horizontally in the web conveyance direction. The second nozzle horizontal movement mechanism is configured to be able to move the nozzle horizontally in a direction orthogonal to the web conveyance direction. The web lifting mechanism is configured to be able to lift and lower the web between the transport surface and the suction surface plate.

  According to this configuration, the first nozzle horizontal movement mechanism and the second nozzle horizontal movement mechanism are driven to move the nozzles in the web conveyance direction and in a direction perpendicular thereto during the pause period of the intermittent conveyance of the web. It is possible to adjust the application position. Thereafter, the web lifting mechanism is driven to lower the web, and the web is sucked and fixed on the suction surface plate by the suction force generating mechanism to form a horizontal coating surface. The feeding liquid is supplied to the nozzle by the feeding mechanism, and the coating liquid is discharged from the nozzle outlet that maintains the predetermined coating gap with the upper surface of the web to form a bead, and the first nozzle horizontal movement mechanism is moved in the web transport direction. By scanning, the bead follows the nozzle and a coating film is formed on the coating surface.

  For adjustment of the application position, an application position detection sensor and an application position controller are used. The application position detection sensor detects an edge of the web or an edge of a coating film already formed on the upper surface of the web. The application position control unit is configured to adjust the initial position of the nozzle based on a detection result of the application position detection sensor, so that the transport mechanism, the first nozzle horizontal movement mechanism, and the second nozzle horizontal movement are adjusted. The mechanism drive is individually controlled.

  In such a web coating apparatus, the reproducibility of the coating gap greatly affects the yield of the coating film thickness. In the present invention, when forming the coating surface, the suction platen is not raised, but the suction platen is fixed and the web is lowered by the web lifting mechanism. Therefore, a predetermined coating gap can be formed with good reproducibility.

  In addition, in order to form a smooth and uniform conveyance surface, when the web is sucked and fixed to the suction surface plate, wrinkles are generated on the web or an air pocket is generated between the web and the suction surface plate. It is necessary to prevent. Therefore, the web lifting mechanism includes a first web support member, a second web support member, a first web support member lifting mechanism, a second web support member lifting mechanism, and a web lifting control unit. The adsorption force generation mechanism includes a web adsorption force control unit.

  The first web support member is arranged to be movable up and down on the upstream side of the suction surface plate in the web conveyance direction of the web, and supports the web. The second web support member is arranged to be movable up and down on the downstream side of the suction surface plate in the conveyance direction of the web, and supports the web. The first web support member elevating mechanism elevates and lowers the first web support member. The second web support member elevating mechanism elevates and lowers the second web support member. The web lifting / lowering control unit includes the first web support member lifting / lowering mechanism and the second web lifting / lowering mechanism so as to gradually lower the web positioned above the suction surface plate from the upstream side to the downstream side in the transport direction. The driving of the web support member lifting mechanism is individually controlled with a time difference. The web suction control unit operates a plurality of suction areas stepwise and additionally in the web transport direction. The plurality of suction areas are areas divided in the web transport direction on the suction surface plate.

  Further, in a thick web that cannot be adsorbed only by controlling the web tension, or a web that is easily stretched and stretched, it is preferable to apply a forcing force that presses the web from above. For this reason, the web coating apparatus of the present invention further includes a mechanism that scans a member that applies linear pressure parallel to a direction orthogonal to the web conveyance direction from above the web in the web conveyance direction.

  The member that applies the linear pressure may be a roller that is in contact with the upper surface of the web and is rotatably supported by an axis oriented in a direction orthogonal to the web conveyance direction.

  Alternatively, the member for applying the linear pressure may be an air jet nozzle having a jet port that holds a gap with the upper surface of the web. In this case, it is more preferable to further include a mechanism for swinging the air ejection nozzle in the web conveyance direction so that the air ejection direction can be varied.

  According to the present invention, the relative position of the nozzle with respect to the application surface of the web can be adjusted before the start of application. Therefore, a coating film can be formed on the web with a good yield.

It is a schematic structure figure showing a web application device concerning an embodiment of the present invention. It is a schematic block diagram which shows the nozzle moving mechanism of the web application | coating apparatus. It is a schematic block diagram which shows another embodiment of the nozzle moving mechanism of the web application | coating apparatus. It is a schematic block diagram which shows another embodiment of the nozzle moving mechanism of the web application | coating apparatus. It is a block diagram which shows the application | coating position control system of the web application | coating apparatus. It is a flowchart which shows the example of application | coating position control of the web application | coating apparatus. It is a top view of the web which shows an example of the detection position by an application position detection sensor. It is a schematic side view of the principal part of a web application | coating apparatus explaining the example of control by a web raising / lowering control part and a web adsorption | suction control part. It is a schematic side view of the principal part of a web application | coating apparatus explaining the operation | movement of a pressing roller. It is a schematic side view of the principal part of a web application | coating apparatus explaining the operation | movement of an air ejection nozzle. It is a schematic side view of the principal part of a web application | coating apparatus explaining the mechanism to rock | fluctuate an air ejection nozzle.

  FIG. 1 is a schematic configuration diagram showing a web coating apparatus according to an embodiment of the present invention.

  In the web coating apparatus 1 of the present invention, for example, as shown in FIG. 1, the web W is unwound from the unwinding section 301, and the web W is cleaned, dust-removed, surface-modified, and the like in the pretreatment process. In the coating process, the coating liquid is applied onto the web W, and after the post-processing process such as drying / cooling is performed, the roll W is wound by the winding unit 302 of the winding mechanism. It can be used as a coating device for a device that is conveyed by two-roll intermittent feeding.

  For this reason, as shown in FIG. 1, the coating apparatus 1 of the present invention has, as shown in FIG. Mechanism 16, first nozzle horizontal movement mechanism 17, second nozzle horizontal movement mechanism 18, application position detection sensors 65 and 66, first web support roller 20, second web support roller 21, and first web support A roller lifting mechanism 22 and a second web support roller lifting mechanism 23 are provided.

  In addition, the web coating apparatus 1 includes a pre-processing apparatus 30, a post-processing apparatus 40, and a nozzle management unit 50 as secondary structures, although the structure is not essential to the present invention.

  The pretreatment device 30 is arranged on the upstream side of the main part that performs the coating process of the web coating device 1 in the conveyance direction of the web W. The pretreatment device 30 performs pretreatment on the coated surface of the web W before performing the coating process. For example, cleaning, dust removal, and surface modification are performed.

  The post-processing device 40 is arranged on the downstream side of the main part that performs the coating process of the web coating device 1 in the conveyance direction of the web W. The post-processing device 40 performs post-processing on the web W after performing the coating process. For example, drying and cooling are performed.

  The nozzle management unit 50 is installed in order to ensure the film thickness accuracy of the coating film start part and coating film end part in thin film / low viscosity coating and intermittent coating. As an example, the nozzle management unit 50 includes a priming roller, a nozzle tip cleaning device, and a dip tank (all not shown). By applying the coating liquid from the discharge port of the nozzle 14 to the surface of the rotating priming roller, the liquid amount of the discharge port of the nozzle 14 is adjusted. The nozzle cleaning device automatically cleans the discharge outlet of the nozzle 14. If the coating liquid is not supplied to the nozzle 14 such as when the apparatus is stopped for a long period of time, when the apparatus is stopped due to trouble, or during maintenance, the discharge port of the nozzle 14 dries and the coating liquid solidifies, resulting in defective coating or nozzle disassembly Cleaning is required. Therefore, drying can be prevented by putting the coating liquid or the cleaning liquid in the dip tank and immersing the tip of the nozzle 14 or keeping the nozzle 14 close to the liquid upper surface position.

  The transport mechanism 10 includes an unwinding unit 11 and a winding unit 12. As an example, the unwinding unit 11 is a roller, and a long web W is wound into a roll. As an example, the winding unit 12 uses a roller, and the end of the web W is attached thereto. The winding unit 12 is rotated by obtaining a rotational force from a driving mechanism (not shown). As a result, the web W is wound around the winding unit 12, and the web W is conveyed in the order of the pretreatment process, the coating process, and the post-treatment process. The drive mechanism intermittently drives the transport mechanism 10 so as to alternately repeat driving and pausing at predetermined intervals. That is, the web W is intermittently conveyed. The coating process is performed during a pause period of intermittent driving of the transport mechanism 10.

  The nip device 64 is disposed on the downstream side of the pretreatment device 30 in the web W conveyance direction. The dancer mechanism 63 is arranged on the downstream side of the post-processing device 40 in the web W conveyance direction. The nip device 64 and the dancer mechanism 63 always operate during intermittent driving of the transport mechanism 10 to apply tension to the web W existing between them, and prevent the web W from sagging in the coating process. . Further, although reference numerals are omitted, a driven roller is provided between the unwinding unit 11 and the winding unit 12 to prevent slack by applying tension to the web W when the transport mechanism 10 is driven. Has been placed. The web W is transported from the coating process to the post-processing process so as to form a horizontal transport surface T as shown in FIG.

  Next, the structure of the main part which performs the application | coating process of the web application | coating apparatus 1 arrange | positioned between the pre-processing apparatus 30 and the post-processing apparatus 40 is demonstrated in detail. The gantry 24 is horizontally supported on the floor surface F by legs and is fixedly installed at a predetermined height. A portion for performing the coating process is installed on the gantry 24.

  The suction surface plate 13 is disposed below the transport surface T. The suction surface plate 13 is fixedly installed on the gantry 24, and the height position is unchanged. As will be described later, the web coating apparatus 1 includes a web lifting mechanism that lifts and lowers the web W instead of lifting the suction surface plate 13 in order to bring the web W into close contact with the suction surface plate 13. The adsorption surface plate 13 is connected to an adsorption force generation mechanism.

  The suction force generating mechanism (not shown) generates suction force on the upper surface of the suction surface plate 13, and a vacuum pump that generates suction suction force is preferably used. The web W is sucked and fixed on the suction surface plate 13 by generating a suction force on the upper surface of the suction surface plate 13 using a vacuum pump. The attracting force generating mechanism can use means for generating an electrostatic attracting force.

  The suction surface plate 13 has a plurality of (three in the present embodiment as an example) suction areas 131 to 133 (see FIG. 8C) divided in the web W conveyance direction. The three suction areas 131 to 133 are operated by a suction force generation mechanism, and the operation is controlled by a web suction control unit (not shown). The three suction areas 131 to 133 are controlled to operate stepwise and additionally in the web W conveyance direction.

  The nozzle 14 is disposed above the transport surface T. As an example of the nozzle 14, a slit die having a slit-like discharge port is used. The nozzles 14 are installed in an orientation in which the slit-shaped discharge ports are parallel to the direction orthogonal to the web W conveyance direction (that is, the width direction of the web W).

  As will be described later, the nozzle 14 is movable in the vertical direction (Z-axis direction) and the web W conveyance direction (X-axis direction). The nozzle 14 travels above the web W and moves the web W in the transport direction (X-axis direction) to apply the coating liquid discharged from the discharge port onto the surface of the web W. The nozzle 14 forms a predetermined coating gap with the web W by moving in the vertical direction (Z-axis direction). The coating liquid discharged from the discharge port is applied onto the web W by the nozzle 14 traveling in the conveyance direction of the web W while maintaining the application gap. In addition to these two directions, the nozzle 14 is also movable in a direction (Y-axis direction) perpendicular to the web W conveyance direction.

  The feeding mechanism 15 supplies a coating liquid to the nozzle 14 and includes a coating liquid tank and a metering pump as an example. Since the metering pump can control the discharge rate of the coating liquid with high precision mechanically, it is possible to control the film thickness at the coating film start part and coating film end part, and by combining smart fitting control, film thickness uniformity can be achieved. It can be improved further. Even if the coating liquid type and the coating liquid clay are changed, the coating liquid monitoring unit and automatic liquid replacement can be performed by installing a coat wagon unit as a coating liquid supply unit. In addition, various piping systems can be combined in accordance with the application application, such as automatic piping cleaning can be performed by putting a cleaning solution into the coating solution tank.

  FIG. 2 is a diagram showing a schematic configuration of the nozzle moving mechanism in a cross section that crosses the transport surface in a direction orthogonal to the transport direction. The stage 25 is fixedly installed on the gantry 24 (see FIG. 1), and the height position is unchanged. The nozzle moving mechanism is configured on this stage 25. The nozzle moving mechanism includes a nozzle lifting / lowering mechanism 16, a first nozzle horizontal moving mechanism 17, and a second nozzle horizontal moving mechanism 18.

  On the stage 25, a gantry-type XZ-axis robot is constructed on the outside of the web W conveyance path so as to face the direction perpendicular to the web W conveyance direction. As an example, this robot uses a biaxial linear actuator having orthogonal axes. With this robot, a nozzle lifting mechanism 16 and a first nozzle horizontal moving mechanism 17 that move the slider 26 holding the nozzle 14 in the vertical direction (Z-axis direction) and the conveyance direction of the web W (X-axis direction), respectively. Realized.

  Further, the web coating apparatus 1 includes a second nozzle horizontal movement mechanism 18 that can move the slider 26 in a direction (Y-axis direction) orthogonal to the conveyance direction of the web W in addition to the above two directions. In the present embodiment, the second nozzle horizontal movement mechanism 18 is provided between the slider 26 and the nozzle 14. In addition, as shown in another embodiment of the second nozzle horizontal movement mechanism in FIG. 3, a second nozzle horizontal movement mechanism 18 is provided between the nozzle lifting / lowering mechanism 16 and the first nozzle horizontal movement mechanism 17. Alternatively, the second nozzle horizontal movement mechanism 18 may be provided between the gantry 24 and the stage 25 as shown in FIG. 4 showing still another embodiment of the second nozzle horizontal movement mechanism.

  As an example, the second nozzle horizontal moving mechanism 18 includes a linear actuator, an electric actuator, a linear motor using an air bearing, an automatic drive system such as a pneumatic / hydraulic actuator, a manual adjustment system using a feed screw, a push-pull screw, and the like. .

  Referring to FIG. 1 again, the first application position detection sensor 65 is arranged on the upstream side of the pretreatment device 30 in the web W conveyance direction. The second application position detection sensor 66 is disposed on the upstream side of the nozzle 14 in the web W conveyance direction. The first application position detection sensor 65 and the second application position detection sensor 66 detect the initial position (application position) of the nozzle 14 by detecting the edge of the web W or the edge of the coating film formed on the upper surface of the web W. ) Is used for control. As such an application position detection sensor, an image processing sensor, a color identification sensor, an ultrasonic sensor, a barcode, a laser sensor, and a thermography sensor are used as an example.

  FIG. 5 shows a block diagram of the application position control system. The application position control unit 27 is based on detection signals from the first application position detection sensor 65 and the second application position detection sensor 66, and includes the transport mechanism 10, the first nozzle horizontal movement mechanism 17, and the second nozzle horizontal movement mechanism 18. Are controlled individually. The application position control unit 27 grasps the position of the nozzle 14.

  An example of application positioning control by the application position control unit 27 will be described with reference to the flowchart of FIG. First, the edge of the web W is detected by the first coating position detection sensor 65 (step S1), and the web W is transported to an initial position set for performing the coating process by driving the transport mechanism 10 (step S1). S2). Again, the edge of the web W of the web W is detected by the second application position detection sensor 66 (step S3), and the application position controller 27 determines the current position of the nozzle 14 in the web W conveyance direction (X-axis direction). Is determined to be displaced from the appropriate position (step S4), and when it is determined that the displacement has occurred, the first nozzle horizontal movement mechanism 17 is operated to move the nozzle 14 in the same direction, Matching is performed (step S5). Subsequently, the application position control unit 27 determines whether or not the current position of the nozzle 14 is shifted from the appropriate position in the direction (Y-axis direction) orthogonal to the conveyance direction of the web W (step S6). When it is determined that the nozzle has occurred, the second nozzle horizontal movement mechanism 18 is operated to move the nozzle 14 in the same direction, and alignment is performed.

  Such application position adjustment can be used when a coating film is formed for the first time on an uncoated web W, but is useful when overcoating or multilayer coating on a web W on which a coating film has already been formed. In the overcoating or the multi-layer coating, the detection positions of the first application position detection sensor 65 and the second application position detection sensor 66 are not the edge of the web W but the edge of the application film as shown in the plan view of FIG. By setting to, it becomes possible to adjust the application position so that the discharge port of the nozzle 14 overlaps the appropriate position above the coating film with high accuracy.

  With reference to FIG. 1 again, the configuration of the web lifting mechanism will be described. The first web support roller 20 is disposed below the conveyance surface T and is arranged to be movable up and down upstream of the suction surface plate 13 in the conveyance direction of the web W, and supports the web W at this position. The second web support roller 21 is located below the transport surface T and is arranged to be movable up and down upstream of the suction surface plate 13 in the transport direction of the web W, and supports the web W at this position. The first web support roller 20 and the second web support roller 21 are examples of the web support member of the present invention. The first web support roller 20 and the second web support roller 21 are driven to rotate as the web W is conveyed.

  The first web support roller raising / lowering mechanism 22 is disposed in the vicinity of the first web support roller 20 and is configured to raise and lower the first web support roller 20. The second web support roller raising / lowering mechanism 23 is disposed in the vicinity of the second web support roller 21 and is configured to raise and lower the second web support roller 21. As the first web support roller lifting mechanism 22 and the second web support roller lifting mechanism 23, for example, a linear actuator or the like is favorably used.

  The driving of the first web support roller lifting mechanism 22 and the second web support roller lifting mechanism 23 is controlled by a web lifting controller (not shown). The web raising / lowering control unit includes a first web support roller raising / lowering mechanism 22 and a first web support roller raising / lowering mechanism 22 so as to gradually lower the web W located above the suction surface plate 13 from the upstream side to the downstream side in the carrying direction of the carrying direction. The second web support roller lifting mechanism 23 is controlled with a time difference.

  A control example by the web lifting control unit and the web suction control unit will be described with reference to FIG. In a series of operations described below, although not particularly illustrated, the nip device 64 and the dancer mechanism 63 are driven to perform a uniform tension on the web W in the transport direction.

  After the above-described application position adjustment, first, in the state shown in FIG. 8A, the first web support roller 20 and the second web support roller 21 are both positioned at the same height, and from the suction surface plate 13. Also supports the web W above. The height of the web W at this time is the same as the height of the conveyance surface T.

  Next, the web lifting control unit drives the first web support roller lifting mechanism 22 and lowers the first web support roller 20 as shown in FIG. 8B. The descending amount of the first web support roller 20 is set to the difference in height between the transport surface T and the upper surface of the suction surface plate 13. At this time, the second web support roller 21 does not descend and is maintained at the initial height. Therefore, as shown in the drawing, the web W positioned above the suction surface plate 13 is supported with an inclination such that the upstream side in the conveyance direction of the web W is low and the downstream side is high.

  Thereafter, as shown in FIGS. 8C to 8E, the web lifting control unit drives the second web support roller lifting mechanism 23 to lower the second web support roller 21. The lowering amount of the second web support roller 21 is set to be the same as that of the first web support roller 20.

  The web suction control unit divides the suction platen 13 in the transport direction so as to synchronize with the three time zones of the early stage, the middle stage, and the final stage when the second web support roller 21 is lowered. The areas 131 to 133 are operated stepwise and additionally. That is, only the first suction area 131 located on the most upstream side in the early stage is operated (see FIG. 8C), and the second suction area 132 located in the center in the middle stage is additionally operated ( 8D), the third suction area 133 located on the most downstream side in the final stage is further operated (see FIG. 8E).

  By the cooperation of the web lifting / lowering control unit and the web suction control unit, the web W is transported as the inclination of the web W becomes smaller in a state where the web W is uniformly tensioned in the transport direction. The web W is gradually adsorbed on the adsorption surface plate 13 from the upstream side to the downstream side in the direction. As a result, it is possible to prevent wrinkles from occurring on the adsorbed web W and air accumulation from occurring between the web W and the adsorption surface plate 13. As a result, even with the flexible web W, a horizontal application surface P (see FIG. 8E) having a regularity and smoothness is formed in the same manner as a single-wafer workpiece such as a wafer. Is possible. If an expander roller (bowed curved roller) is employed as the web support rollers 20 and 21, wrinkles generated on the web W can be effectively prevented.

  After the application surface P is thus formed, the nozzle lifting mechanism 16 is driven to maintain a predetermined application gap between the discharge port of the nozzle 14 and the application surface P. The feeding mechanism 15 is driven and a small amount of coating liquid discharged from the nozzle 14 forms a coating liquid pool (bead) in the coating gap. Then, the first nozzle horizontal moving mechanism 17 is driven, and the nozzle 14 is continuously or intermittently scanned by a predetermined distance not exceeding the length of the suction surface plate 13 in the conveyance direction of the web W. Following the movement of the nozzle 14, the coating solution is applied to the coating surface P entirely or intermittently.

  In addition to the above-described time difference drive of the web lifting mechanism and the stepwise and additional operations of the plurality of suction areas, a structure may be provided in which a force is applied to the web W from above to hold it onto the suction surface plate 13. For example, it is a mechanism that scans, in the web W conveyance direction, a member that applies linear pressure parallel to a direction perpendicular to the web W conveyance direction to the web W that is adsorbed and fixed on the adsorption platen 13. A linear actuator is used as an example of the scanning mechanism.

  FIG. 9 illustrates the case where the member for applying linear pressure is a presser roller. The presser roller 28 is rotatably supported by an axis oriented in a direction orthogonal to the conveyance direction of the web W. The presser roller 28 is disposed above the conveyance surface T (see FIG. 9A) and is lowered to a position where it comes into contact with the upper surface of the web W supported on the suction surface plate 13 by an elevating mechanism (not shown). Then, linear pressing parallel to the direction orthogonal to the conveying direction of the web W is applied to the web W (see FIG. 9B). The pressing roller 28 is scanned from the downstream side to the upstream side in the conveyance direction of the web W by a scanning mechanism (not shown), and the pressing roller 28 travels while rotating on the web W (FIGS. 9C to 9E). reference.). By adopting a pneumatic cylinder or the like for the lifting mechanism portion of the presser roller 28, the pressing by the presser roller 28 can be arbitrarily set by changing the internal air pressure, so that the web W is not stressed.

  FIG. 10 illustrates the case where the member that applies the linear pressure is the air ejection nozzle 29. The air ejection nozzle 29 is disposed above the transport surface T (see FIG. 10A). The air ejection nozzle 29 has an ejection port that maintains a gap between the lower surface and the upper surface of the web W. For example, the spout has a slit shape extending in a direction orthogonal to the conveyance direction of the web W, but is not limited thereto, and the spout may be configured by a plurality of small holes arranged at equal intervals in the same direction. good. The air ejection nozzle 29 is connected to an air pump or the like that pumps air, and applies high pressure air ejected from the ejection port to the web W with linear air pressure parallel to a direction orthogonal to the web W conveyance direction (FIG. 10 ( See B). The air ejection nozzle 29 that discharges air is scanned from the downstream side to the upstream side in the conveyance direction of the web W by a traveling mechanism (not shown) (see FIGS. 10C to 10E). Since the air ejection nozzle 29 is scanned in a non-contact state with the coating surface P, the web W is not damaged and does not affect the coating film during overcoating or multilayer coating. Moreover, the removal effect of the dust which exists in the application surface P can also be expected. The air pressure by the air ejection nozzle 29 can be adjusted by a regulator or the like, and the air ejection flow rate can be adjusted by changing the opening width of the flow meter or the slit-shaped ejection port with a shim or the like.

  In order to change the air ejection direction, as shown in FIG. 11, the air ejection nozzle 29 is supported by a rocking shaft 291 in a direction perpendicular to the conveying direction of the web W so that the air ejection nozzle 29 can swing. A mechanism for swinging the web W in the conveyance direction of the web W may be provided.

  In this way, by causing the presser roller 28 to run on the web W and scanning the air ejection nozzle 29 above the web W, thick webs and wrinkles that cannot be adsorbed only by controlling the tension of the web W enter. The easily stretchable web can be uniformly sucked onto the suction surface plate 13.

  In the above-described embodiment, coating is performed by scanning the nozzle 14 in the web W conveyance direction by the first nozzle horizontal movement mechanism 17 in the coating process. For this reason, the nozzle movable amount by the first nozzle horizontal moving mechanism 17 is set to be considerably larger than the nozzle movable distance by the second nozzle horizontal mechanism 18 for adjusting the initial position of the nozzle 14 exclusively. . On the other hand, the stage 25 may be configured to be orthogonal to the conveyance direction of the web W. According to this, the nozzle scanning direction in the coating process is reversed at right angles to the case of the present embodiment. That is, it is possible to apply in a direction orthogonal to the conveyance direction of the web W.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 ... Web coating apparatus 10 ... Conveyance mechanism 13 ... Adsorption | suction surface plate 131 ... 1st adsorption area 132 ... 2nd adsorption area 133 ... 3rd adsorption area 14 ... Nozzle 15 ... Feeding mechanism 16 ... Nozzle raising / lowering mechanism 17 ... 1st nozzle horizontal movement mechanism 18 ... 2nd nozzle horizontal movement mechanism 20 ... 1st web support roller 21 ... 2nd web support roller 22 ... 1st web support roller raising / lowering mechanism 23 ... 2nd web support roller Elevating mechanism 24 ... Stand 25 ... Stage 26 ... Slider 27 ... Coating position controller 28 ... Presser roller 29 ... Air ejection nozzle 30 ... Pre-processing device 40 ... Post-processing device 50 ... Nozzle management unit 63 ... Dance mechanism 64 ... Nip device 65 ... first application position detection sensor 66 ... second application position detection sensor W ... web P ... application surface T ... conveying surface

Claims (9)

A transport mechanism for intermittently transporting a long web so as to form a horizontal transport surface;
An adsorption surface plate disposed below the conveying surface, on which the web is adsorbed and fixed;
An adsorption force generating mechanism for generating an adsorption force on the upper surface of the adsorption surface plate;
A nozzle that is disposed above the transport surface and has a discharge port that maintains a predetermined coating gap with the upper surface of the web; and a nozzle that discharges the coating liquid from the discharge port;
A feeding mechanism for feeding the coating liquid to the nozzle;
A first nozzle horizontal movement mechanism configured to be capable of horizontally moving the nozzle in the web conveying direction;
A second nozzle horizontal movement mechanism configured to be capable of horizontally moving the nozzle in a direction orthogonal to the web conveyance direction;
A web lifting mechanism configured to be able to lift and lower the web between the transport surface and the suction surface plate;
A web coating apparatus comprising: An application position detection sensor for detecting an edge of the web or an edge of a coating film already formed on the upper surface of the web;
Based on the detection result of the application position detection sensor, the transport mechanism, the first nozzle horizontal movement mechanism, and the second nozzle horizontal movement mechanism are individually controlled to adjust the initial position of the nozzle. An application position control unit,
The web coating apparatus according to claim 1, comprising: The web lifting mechanism is
A first web support member arranged to be movable up and down on the upstream side of the suction surface plate with respect to a conveyance direction of the web, and supporting the web;
A second web support member arranged to be movable up and down on the downstream side of the suction surface plate in the web conveyance direction, and supporting the web;
A first web support member elevating mechanism for elevating and lowering the first web support member;
A second web support member lifting mechanism for lifting and lowering the second web support member;
The first web support member elevating mechanism and the second web support member elevating mechanism are configured to gradually lower the web located above the suction surface plate from the upstream side to the downstream side in the transport direction. A web lifting control unit that individually controls the driving with a time difference;
The web coating apparatus according to claim 1, comprising: The suction surface plate has a plurality of suction areas divided in the web conveyance direction,
The web application apparatus according to claim 3, wherein the adsorption force generation mechanism includes a web adsorption control unit that causes the plurality of adsorption areas to operate stepwise and additionally in a conveyance direction of the web.   The web coating apparatus according to claim 4, further comprising a mechanism that scans a member that applies a linear pressure parallel to a direction orthogonal to the web conveyance direction from above the web in the web conveyance direction.   The web application according to claim 5, wherein the member that applies the linear pressure is a roller that is in contact with the upper surface of the web and is rotatably supported by an axis oriented in a direction orthogonal to the conveyance direction of the web. apparatus.   The web coating apparatus according to claim 5, wherein the member that applies the linear pressure is an air jet nozzle having a jet port that holds a gap between the member and the upper surface of the web.   The web coating apparatus according to claim 7, further comprising a mechanism that swings the air ejection nozzle in a conveyance direction of the web.   The stage in which the first nozzle horizontal movement mechanism and the second nozzle horizontal movement mechanism are constructed is configured to be arranged to be orthogonal to the conveyance direction of the web. The web coating apparatus according to any one of the above.

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