JP2009112971A - Coating device and laminated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating device capable of easily carrying out coating uniform in the width direction even when the coating condition or the coating liquid is changed and a laminated sheet manufactured by the coating device. <P>SOLUTION: In the coating device 1 using a bar coater for supplying the coating liquid 12 to a rotating bar 29 from the upstream side and the downstream side in the transportation direction of a web 11 and applying the coating liquid on the web 11 accompanying the rotation of the bar 29, the groove width t1, t2 of an upstream supply groove 37 and a downstream supply groove 40 are changeable by rearranging respective height blocks 25, 26 have been assembled to different sized other height blocks. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating apparatus for applying a coating solution to a continuous belt web such as plastic film, paper, and metal foil, and a laminated sheet manufactured by the coating apparatus.

  When producing a laminated sheet such as a liquid crystal film, for example, a surface treatment layer such as an antistatic agent or a release agent is applied to at least one surface of the plastic film. And in the coating device which performs application | coating of such a coating liquid, it is necessary to make the thickness of the layer after application | coating into a predetermined thickness for every product. Therefore, in the case where the coating liquid is conventionally applied with such a coating apparatus, first, the coating liquid is first applied to a film conveyed by an applicator roll, and then applied once by a bar around which a smooth rod and a wire are wound. The liquid was scraped off, and adjustment was performed so as to obtain a predetermined coating amount.

  In recent years, in particular, the demand for thickness accuracy in the width direction of optical films has increased, and the required quality for defects such as coating unevenness and streaks has also increased. Under such circumstances, in the coating apparatus, it is difficult to adjust the coating thickness in the width direction, and it has become impossible to meet the required quality, such as solid matter becoming a foreign substance due to volatilization of the coating solution.

Therefore, for example, Japanese Patent Application Laid-Open No. 2004-74147 describes a so-called bar coater that applies a coating liquid with a rotating bar as a coating apparatus that solves such a problem. In this conventional bar coater, a coating device comprising a block that supports the bar at the top and a block that is disposed on both sides of the block and distributes the coating liquid to the upstream side and the downstream side in the web conveyance direction is used. ing. According to this coating apparatus, it is possible to reduce defects due to solidification of the coating liquid by applying the coating liquid distributed on the upstream side and the downstream side to the web as the bar rotates.
Japanese Patent Laying-Open No. 2004-74147 (page 7-9, FIGS. 1 and 2)

  Here, in the bar coater described in Patent Document 1, in order to perform precise coating film thickness control, an appropriate pressure loss is caused in the groove width portion through which the distributed coating liquid passes when the coating liquid is distributed. Is required. However, this pressure loss varies greatly depending on the coating conditions for coating the coating solution and the coating solution viscosity (that is, the type of coating solution used). Therefore, every time the coating conditions and the type of coating solution are changed, it is a problem that a new coating device needs to be designed and manufactured.

  The present invention has been made to solve the above-described conventional problems, and even when the coating conditions and the coating liquid are changed, uniform coating can be easily performed in the width direction, maintaining quality and reducing introduction cost. It aims at providing the lamination sheet manufactured by the coating device which can aim at, and a coating device.

  In order to achieve the above object, a coating apparatus according to claim 1 of the present application is a coating apparatus that applies a coating liquid to a continuously running web. An upstream cavity block and a downstream cavity block disposed opposite to each other, and a gap between the feed block and the upstream cavity block, and an upstream side for supplying the coating liquid from the upstream side in the web conveyance direction. Formed by a gap between the supply groove, the feed block, and the downstream cavity block, and rotates between the feed block and the web, a downstream supply groove that supplies the coating liquid from the downstream side in the web conveyance direction. The coating liquid supplied from the upstream supply groove and the downstream supply groove is circulated. A bar that is applied to the web as it moves, a support member that rotatably supports the bar, a drive device that rotationally drives the bar, the feed block, and the upstream cavity block. An upstream height block that determines the groove width of the upstream supply groove based on the block width with respect to the groove width direction of the groove, and is sandwiched between the feed block and the downstream cavity block, and the block width with respect to the groove width direction of the downstream supply groove And a downstream height block for determining a groove width of the downstream supply groove.

  Further, the coating apparatus according to claim 2 is the coating apparatus according to claim 1, wherein the upstream height block and the downstream height block are composed of a plurality of types of blocks having different block widths with respect to the groove width direction of the supply groove, The groove widths of the upstream supply groove and the downstream supply groove are changed by exchanging the upstream height block and the downstream height block.

  The coating apparatus according to claim 3 is the coating apparatus according to claim 1 or 2, wherein the groove width of the upstream supply groove and the downstream supply groove can be adjusted in units of 50 μm, and the dimensional tolerance of the groove width. Is within ± 2.5 μm.

  The coating apparatus according to claim 4 is the coating apparatus according to any one of claims 1 to 3, wherein the upstream height block and the downstream height block are groove widths of the upstream supply groove and the downstream supply groove. The thickness with respect to the direction is 5 to 20 mm, and the flatness is 2/1000 to 1/100 mm.

  The coating apparatus according to claim 5 is the coating apparatus according to any one of claims 1 to 4, wherein the coating liquid to be applied is an adhesive, an antistatic agent, a release treatment agent, or an antifouling agent. It is a processing agent.

  Furthermore, the laminated sheet according to claim 6 is characterized in that a film is formed in a laminated form by the coating liquid applied by the coating apparatus according to any one of claims 1 to 5.

  In the coating apparatus according to claim 1 having the above-described configuration, the coating liquid is supplied to the bar rotating from the upstream side and the downstream side in the web conveyance direction, and the coating liquid is applied to the web as the bar rotates. In the device, the groove width of the upstream supply groove and the downstream supply groove for supplying the coating liquid can be determined by the block width of the machined height block, so the groove width of the upstream supply groove and the downstream supply groove can be easily changed. It becomes possible to do. Therefore, even when the coating conditions and the coating liquid are changed, it is not necessary to design and manufacture a new coating device, and uniform coating can be easily performed in the width direction, so that quality can be maintained and introduction cost can be reduced. .

  In the coating apparatus according to claim 2, the groove widths of the upstream supply groove and the downstream supply groove for supplying the coating liquid can be easily changed by reassembling the currently assembled height block to another height block. It becomes possible to do. Therefore, even when the coating conditions and the coating liquid are changed, it is not necessary to design and manufacture a new coating device, and uniform coating can be easily performed in the width direction, so that quality can be maintained and introduction cost can be reduced. .

  In the coating apparatus according to claim 3, the groove width of the upstream supply groove and the downstream supply groove can be adjusted in units of 50 μm, and the dimensional tolerance of the groove width is within ± 2.5 μm. It is possible to correspond to the type of coating liquid to be applied, and uniform coating in the width direction is possible.

  In the coating apparatus according to claim 4, the upstream height block and the downstream height block have a thickness in the groove width direction of the upstream supply groove and the downstream supply groove of 5 to 20 mm and a flatness of 2/1000 to 1/100 mm. Therefore, it is possible to change the groove width, which is superior in mechanical accuracy and repeatability as compared with the prior art.

  Further, in the coating apparatus according to claim 5, by using an adhesive, an antistatic agent, a release treatment agent, or an antifouling treatment agent as a coating solution, it is possible to produce a laminated sheet for various uses. Become.

  Further, in the laminated sheet according to claim 6, by using only one coating device, it is possible to uniformly apply various kinds of laminated sheets in the width direction, and it is possible to maintain quality and reduce manufacturing costs. Can be achieved.

  Hereinafter, based on the embodiment which materialized the coating device and lamination sheet concerning the present invention, it explains in detail, referring to drawings. First, the coating apparatus 1 which concerns on this embodiment is demonstrated using FIG. FIG. 1 is a perspective view showing a schematic configuration of a coating apparatus 1 according to the present embodiment.

  As shown in FIG. 1, the coating apparatus 1 according to the present embodiment basically includes a die 2, a supply tank 3, transfer lines 4 to 6, supply pumps 7 and 8, and transfer rollers 9 and 10. Is done.

  The die 2 forms a coating film 13 having a predetermined thickness by coating the coating liquid 12 on the surface of a web 11 such as a continuously running film, paper, or metal foil. Here, the coating apparatus 1 according to the present embodiment uses a so-called bar coater that applies a coating solution to the web 11 using a bar that rotates around a rotation axis orthogonal to the conveyance direction of the web 11 as the die 2. . The bar coater has narrow gaps (supply grooves) extending in the application width direction leading from the liquid reservoir to the upstream side and the downstream side in the web conveyance direction, respectively, and rotates the application liquid from the upstream side and the downstream side from each supply groove. In this coating method, the coating liquid is applied to the web that is supplied to the outer periphery of the bar and abuts against the bar as the bar rotates. According to the coating method using this bar coater, the coating film can be made thinner and the coating process can be performed at a high speed as compared with the ordinary slot die coating.

  Hereinafter, the configuration of the die 2 according to the present embodiment will be described in detail with reference to FIGS. 2 to 4. 2 is a front view showing the die 2 according to the present embodiment, FIG. 3 is a side view showing the die 2 according to the present embodiment, and FIG. 4 is an arrow view of the die 2 cut along line AA in FIG. It is sectional drawing.

As shown in FIGS. 2 to 4, the die 2 according to this embodiment includes a feed block 22 fixed on the reference base 21, an upstream cavity block 23 and a downstream cavity block 24 combined with the feed block 22. The upstream height block 25 sandwiched between the feed block 22 and the upstream cavity block 23, the downstream height block 26 sandwiched between the feed block 22 and the downstream cavity block 24, and the longitudinal direction of the die 2 Side plates 27, 28 disposed on both sides of the
A bar 29 rotatably supported on the upper part of the feed block 22, a pair of support blocks 30 and 31 fixed on the reference base 21 and rotatably supporting the bar 29, and a drive motor 32 for rotating the bar 29 And a coupling 33 for coupling the bar 29 to the rotating shaft of the drive motor 32.

Here, the feed block 22 is a block having a substantially rectangular parallelepiped shape, and positions the die 2 with respect to the reference base 21. The feed block 22 is fixed to the reference base 21 with bolts or the like. Further, a curved surface 35 is formed at the top of the feed block 22 in accordance with the diameter of the bar 29, and a gap 34 having a constant width is formed between the bar 29 and the bar 29 when the bar 29 is disposed.
In the feed block 22, it is preferable to use PTFE, MC nylon, or ultrahigh molecular weight PE as the material of the curved surface 35 facing the bar 29 in consideration of the life of the bar. Moreover, although the shape of the curved surface 35 is processed into the semicircle shape in this embodiment, you may use what was processed into the V shape.

  On the other hand, the upstream cavity block 23 and the downstream cavity block 24 are blocks arranged to face the upstream side surface and the downstream side surface of the feed block 22 in the conveyance direction of the web 11, respectively. And it attaches with respect to the feed block 22 with a volt | bolt etc.

Further, a concave portion having a predetermined shape is formed on the surface of the upstream cavity block 23 facing the feed block 22, and an upstream liquid reservoir 36 and an upstream supply groove 37 are formed by combining with the feed block 22.
Similarly, a concave portion having a predetermined shape is formed on the surface of the downstream cavity block 24 facing the feed block 22, and the downstream liquid reservoir 39 and the downstream supply groove 40 are formed by combining with the feed block 22.

  Here, the upstream liquid reservoir 36 and the downstream liquid reservoir 39 are formed in a semi-cylindrical shape along the longitudinal direction of the die 2, and are areas for storing the coating liquid 12 supplied from the supply tank 3. The upstream liquid reservoir 36 is communicated with an upstream supply groove 37 and a coating liquid supply port 45 and a coating liquid recovery port 46 described later provided in the upstream cavity block 23. Further, the downstream liquid reservoir 39 communicates with the coating liquid supply port 47 and the downstream supply groove 40 provided in the downstream cavity block 24.

  On the other hand, an insertion recess 38 into which an upstream height block 25 described later is inserted is formed at the bottom of the opposite surface of the upstream cavity block 23 facing the feed block 22 as shown in FIG. Further, an insertion recess 41 into which a downstream height block 26 described later is inserted is formed at the bottom of the opposite surface of the downstream cavity block 24 facing the feed block 22 as shown in FIG.

The upstream cavity block 23 is formed with a coating liquid supply port 45 that guides the coating liquid 12 supplied from the supply tank 3 through the transport line 4 to the upstream liquid reservoir 36. Further, the upstream cavity block 23 is formed with a coating liquid recovery port 46 that recovers the coating liquid 12 that has overflowed when coating the web 11 to the supply tank 3 again via the transport line 6.
On the other hand, the downstream cavity block 24 is formed with a coating liquid supply port 47 that guides the coating liquid 12 supplied from the supply tank 3 through the transport line 5 to the downstream liquid reservoir 39.
Then, the measured application liquid is supplied from the supply tank 3 to the upstream liquid reservoir 36 through the application liquid supply port 45 by the supply pump 7. Further, the coating liquid 12 supplied to the upstream liquid reservoir 36 is sent to the upstream supply groove 37 and discharged at a constant amount per unit time in the width direction with a uniform pressure in the width direction. To the right). On the other hand, the measured application liquid is supplied from the supply tank 3 to the downstream liquid reservoir 39 through the application liquid supply port 47 by the supply pump 8. Further, the coating liquid 12 supplied to the downstream liquid reservoir 39 is fed to the downstream supply groove 40 and discharged at a constant amount per unit time with a uniform pressure in the width direction, and downstream (see FIG. 4) to the outer peripheral surface of the bar 29. From the left). The coating liquid supply ports 45 and 47 are center positions in the length direction of the upstream supply groove 37 and the downstream supply groove 40 of the die 2 (for example, 300 mm from the left and right ends when the groove width is 600 mm). Is provided.

Next, the upstream height block 25 and the downstream height block 26 will be described.
The upstream height block 25 and the downstream height block 26 are blocks having a rectangular parallelepiped shape. The upstream height block 25 is bolted to the upstream cavity block 23 while being inserted into the insertion recess 38 formed in the upstream cavity block 23, and the feed block 22 and the upstream cavity block 23 are combined. When sandwiched by each block. On the other hand, the downstream height block 26 is bolted to the downstream cavity block 24 while being inserted into the insertion recess 41 formed in the downstream cavity block 24, and the feed block 22 and the downstream cavity block 24 are combined. When sandwiched by each block. Further, the upstream height block 25 and the downstream height block 26 inserted in the insertion recesses 38 and 41 are arranged so as to be parallel to the longitudinal direction of the bar 29, the upstream supply groove 37 and the downstream supply groove 40.
Then, as described later, the groove width t1 of the upstream supply groove 37 is determined based on the block width in the groove width direction of the upstream supply groove 37 of the upstream height block 25. Similarly, the groove width t2 of the downstream supply groove 40 is determined based on the block width of the downstream height block 26 with respect to the groove width direction of the downstream supply groove 40.

  Hereinafter, the relationship between the upstream height block 25 and the upstream supply groove 37 and the relationship between the downstream height block 26 and the downstream supply groove 40 will be described in more detail. Since the upstream height block 25 and the downstream height block 26 and the upstream supply groove 37 and the downstream supply groove 40 are symmetrical and have the same structure, the upstream height block 25 and the upstream supply groove 37 will be described below as an example. Will be described.

The upstream height block 25 has a plurality of types of blocks having different block widths T1 with respect to the groove width direction of the upstream supply groove 37 (for example, different types of blocks every 50 μm from T1 = 5 mm to 20 mm). By replacing the block 25 with an upstream height block of another size, the groove width t1 of the upstream supply groove 37 of the die 2 can be changed to an arbitrary size without replacing the entire die 2.
For example, when the upstream height block 25 having a block width T1 of 5 mm is used, the groove width t1 of the upstream supply groove 37 is determined to be 100 μm. When the upstream height block 25 having a block width T1 of 5.1 mm is used, the groove width t1 of the upstream supply groove 37 is determined to be 200 μm. When the upstream height block 25 having a block width T1 of 5.2 mm is used, the groove width t1 of the upstream supply groove 37 is determined to be 300 μm.
Although the description is omitted, the same relationship holds for the block width T2 of the downstream height block 26 and the groove width t2 of the downstream supply groove 40.

Here, the block widths T1 and T2 of the upstream height block 25 and the downstream height block 26 are set to 5 mm to 20 mm in order to maintain the machining accuracy. Further, the groove width t1 of the upstream supply groove 37 determined by the block width T1 of the upstream height block 25 and the groove width t2 of the downstream supply groove 40 determined by the block width T2 of the downstream height block 26 are changed according to the application conditions. Although it is necessary, it is 0.1 mm to 1 mm, preferably 0.2 mm to 0.5 mm.
In addition, the processing accuracy of the upstream supply groove 37 and the downstream supply groove 40 is important for the uniform distribution of the coating liquid in the width direction in the upstream supply groove 37 and the downstream supply groove 40. Accordingly, the upstream height block 25 and the downstream height block 26 are ground so that the flatness is 2/1000 mm to 10/1000 mm, preferably 2/1000 mm to 5/1000 mm. Similarly, the feed block 22, the upstream cavity block 23, and the downstream cavity block 24 are ground so that the flatness is 2/1000 mm to 10/1000 mm. Then, it is fastened and assembled to the height block so that the groove width t1 of the upstream supply groove 37 and the groove width t2 of the downstream supply groove 40 become a predetermined groove width in units of 50 μm ± 2.5 μm.

Further, the groove width t1 of the upstream supply groove 37 and the groove width t2 of the downstream supply groove 40 are not necessarily the same width, and can be set according to the respective conditions. In particular, it is important to adjust the flow rates of the coating liquid supply from the upstream supply groove 37 and the coating liquid supply from the downstream supply groove 40 in order to reduce liquid breakage and coating stripes.
Here, conventionally, adjustment has been performed by the opening degree of the valve provided in front of the die 2. However, in that case, when the flow rate is low with respect to the set groove width, the coating liquid cannot be distributed in the width direction, and the film thickness becomes non-uniform. On the other hand, in the structure according to the present embodiment, it is possible to easily adjust the upstream and downstream groove widths according to the flow rate, and to maintain the uniformity of the film thickness.

  The side plates 27 and 28 are disposed on both sides of the die 2 in the longitudinal direction, and regulate the length of the upstream supply groove 37 and the downstream supply groove 40 and seal the die 2. The side plates 27 and 28 are fixed to the feed block 22, the upstream cavity block 23, and the downstream cavity block 24 by bolts or the like.

  In order to assemble each block with good reproducibility, a specified torque wrench should be used with a room (exclusive booth) where temperature variation is controlled at 1 ° C or less and a precise stone surface plate (JIS00 grade) as the reference plane. It is desirable to use and tighten bolts.

On the other hand, the bar 29 is a cylindrical member that is rotatably supported by the support blocks 30 and 31 with respect to the reference base 21. The bar 29 is arranged on the upper part of the feed block 22 in parallel with the feed block 22 and abuts against the web 11 being conveyed. Furthermore, the rotation axis of the bar 29 is in a direction that intersects the conveyance direction of the web 11. The bar 29 is rotationally driven at a predetermined speed in a predetermined rotational direction as the drive motor 32 coupled through the coupling 33 is driven.
The bar 29 preferably has a diameter in the range of 6 mm to 20 mm. In addition, stainless steel is often used as the material, and SUS304 or SUS316 considering corrosion resistance is used.
Furthermore, it is possible to use a bar 29 in which a wire is wound. In this case, a wire diameter of 20 μm to 150 μm is used. In this embodiment, the bar 29 rotates in the reverse rotation direction with respect to the web based on the drive of the drive motor 32, but the rotation direction of the bar may be the normal rotation direction with respect to the web 11. Further, the rotational speed is used between 10 rpm and 500 rpm.

  On the other hand, the supply tank 3 shown in FIG. 1 is a tank for storing the coating liquid 12, and the stored coating liquid 12 is supplied to the die 2 with a constant supply amount per unit time by the supply pumps 7 and 8. Is done. In addition, although the kind of coating liquid used changes with laminated sheets to manufacture, an adhesive, an antistatic agent, a peeling treatment agent, an antifouling treatment agent, etc. are used.

  The transfer line 4 and the transfer line 6 are pipes connecting the supply tank 3 and the upstream liquid reservoir 36 of the die 2, and the transfer line 5 is a pipe connecting the supply tank 3 and the downstream liquid reservoir 39 of the die 2. is there. Then, the coating liquid 12 supplied from the supply tank 3 is distributed by the transport line 4 and the transport line 5, and the coating liquid 12 passing through the transport line 4 reaches the upstream supply groove 37 on the upstream side. On the other hand, the coating liquid 12 that has passed through the transport line 5 reaches the downstream supply groove 40 on the downstream side. In addition, the coating liquid 12 overflowed in the upstream supply groove 37 and the upstream liquid reservoir 36 is collected into the tank through the transport line 6.

Further, the transport line 4 is provided with a flow meter 51 for detecting the flow rate of the coating liquid 12 flowing through the transport line 4 and a pressure meter 52 for detecting the pressure. Similarly, the transport line 5 is provided with a flow meter 53 for detecting the flow rate of the coating liquid 12 flowing through the transport line 5 and a pressure meter 54 for detecting the pressure. Further, the transport line 6 is provided with a flow meter 55 for detecting the flow rate of the coating liquid 12 flowing through the transport line 6.
The flow rates supplied to the transport line 4 and the transport line 5 are managed by flow meters 51 and 53, respectively. The supplied coating solution is transferred to the web 11 by the bar 29 as described above. Further, the transferred coating liquid thickness can be managed by the difference between the indicated value of the flow meter 55 and the flow rate of the supply system. Moreover, the pressure gauges 52 and 54 provided in the supply system manage the pressure loss of the upstream and downstream blocks.

  The supply pumps 7 and 8 are supply means for supplying the coating liquid 12 stored in the supply tank 3 to the transport line 4 and the transport line 5 at a constant predetermined amount per unit time. The supply pumps 7 and 8 do not have to be two, and it is possible to install only one. In that case, the upstream and downstream flow rates are adjusted by valve operation.

  The transport rollers 9 and 10 are transport means for transporting the web 11 in a predetermined direction at a predetermined speed set in advance.

  Although not shown, the coating apparatus 1 is provided with a control device that controls the supply pumps 7 and 8, the drive sources of the transport rollers 9 and 10, and the drive motor 32. Then, the control device adjusts the supply pump rotation speed, the conveyance speed of the conveyance rollers 9 and 10, the rotation speed of the bar 29, and the like according to a preset program. Thereby, the thickness of the coating film 13 applied to the web 11 is adjusted.

  Next, the coating process of the coating liquid 12 onto the web 11 in the coating apparatus 1 according to this embodiment configured as described above will be described. First, the supply pumps 7 and 8 connected to the level-controlled supply tank 3 distribute the coating solution 12 measured at a flow rate corresponding to the target thickness setting in two directions, upstream and downstream, respectively, and store the upstream solution respectively. The liquid is sent to 36 and the downstream liquid reservoir 39. Then, the coating liquid 12 is supplied from the upstream supply groove 37 and the downstream supply groove 40 communicated with the liquid reservoirs 36 and 39 to the outer peripheral surface of the rotating bar 29. As the bar 29 rotates, a coating liquid film is formed on the outer peripheral surface of the bar, and then the coating liquid 12 is applied to the web 11 with a predetermined thickness by the bar 29 coming into contact with the web 11.

[Evaluation]
Next, the relationship between the groove width of the upstream supply groove 37 and the downstream supply groove 40 and the state of the application surface was manufactured by the application apparatuses of Examples 1 to 4 and Comparative Examples 1 to 3 according to the present invention. The evaluation results of the laminated sheets will be compared and described. The coating apparatus 1 described above is used for any of Examples 1 to 4 and Comparative Examples 1 to 3.

(Example 1)
An acrylic pressure-sensitive adhesive having a viscosity of 30 ms Pas was applied to the polyester film under the following application conditions. The coating liquid feeding flow rate was 3000 cc / min on the upstream side and 2000 cc / min on the downstream side. The upstream height block 25 and the downstream height block 26 are set so that the groove widths t1 and t2 of the upstream supply groove 37 and the downstream supply groove 40 are 0.5 mm upstream and 0.5 mm downstream according to the flow rate. .
Line speed: 100m / min
Application thickness: 50cc / m ²
Bar diameter ・ ・ ・ 10mm
Rotation speed -50rpm (reverse rotation)
Application width: 600mm

(Comparative Example 1)
On the basis of the conditions of Example 1, the flow rate was changed to make the coating thickness 20 cc / m ² . The groove width was applied at the same upstream side of 0.5 mm as in Example 1 and downstream side of 0.5 mm.

(Comparative Example 2)
Application was performed under the same conditions as in Comparative Example 1 except that the groove width was changed to 0.45 mm upstream and 0.4 mm downstream.

(Example 2)
Application was performed under the same conditions as in Comparative Example 1 except that the groove width was 0.4 mm upstream and 0.35 mm downstream.

(Example 3)
In order to apply a long-chain alkyl release agent having a viscosity of 10 mPas to the polyester film, application was performed under the same application conditions as in Example 1. At this time, the height block was set such that the upstream supply groove 37 and the downstream supply groove 40 had a groove width of 0.3 mm upstream and 0.3 mm downstream.

(Comparative Example 3)
The coating was performed under the same coating conditions as in Example 3 except that the coating thickness was 20 cc / m ² .

Example 4
Application was performed under the same conditions as in Comparative Example 3 except that the groove width was 0.25 mm upstream and 0.2 mm downstream.

〔result〕
The result of having performed the application | coating test in the said Examples 1-4 and Comparative Examples 1-3 is shown in FIG.
In Example 1, the application amount was 50 cc / m ² , and the groove width was 0.5 mm and application was possible without liquid breakage or streaks. However, in Comparative Example 2, the application thickness was changed to 20 cc / m ² , Partial streaks due to liquid galling occurred. On the other hand, the same defect occurred in Comparative Example 3, but it was possible to apply without application defects by setting the groove width to the same size as in Example 2.
Similarly, Examples 3 and 4 and Comparative Example 3 are also examples in which coating liquids having different viscosities are applied, and even when the coating thickness is changed by changing the groove width, it is good by adjusting the groove width in units of 50 μm. A coated surface could be obtained.
The same can be said for changing the line speed, and it can be said that satisfactory application can be achieved by adjusting the optimum groove width for a predetermined coating liquid flow rate.
Therefore, even if it is necessary to change the coating conditions from these, it is possible to produce with one coating device by using the coating device 1 of the present invention, which greatly reduces initial cost and increases efficiency. It is clear that is expected.

As described above, according to the coating apparatus 1 according to the present embodiment, the coating liquid 12 is supplied to the bar 29 that rotates from the upstream side and the downstream side in the conveyance direction of the web 11, and is applied to the web 11 as the bar 29 rotates. In a coating apparatus using a bar coater for coating a coating solution, the upstream height block 25 and the downstream height block 26 in which the groove widths t1 and t2 of the upstream supply groove 37 and the downstream supply groove 40 for supplying the coating solution are machined are machined. It can be determined by T1 and T2. That is, the groove widths t1 and t2 of the upstream supply groove 37 and the downstream supply groove 40 can be easily changed by reassembling the height blocks 25 and 26 that are currently assembled to height blocks of other sizes. . Therefore, even when the coating conditions and the coating liquid are changed, it is not necessary to design and manufacture a new coating device, and uniform coating can be easily performed in the width direction, so that quality can be maintained and introduction cost can be reduced. .
In addition, the groove width of the upstream supply groove 37 and the downstream supply groove 40 can be adjusted in units of 50 μm, and the dimensional tolerance of the groove width is within ± 2.5 μm, so it corresponds to various application conditions and types of application liquids to be used. And uniform application in the width direction.
Further, the upstream height block 25 and the downstream height block 26 are 5 to 20 mm in thickness in the groove width direction of the upstream supply groove 37 and the downstream supply groove 40 and have a flatness of 2/1000 to 1/100 mm. Compared to the above, it is possible to change the groove width with excellent mechanical accuracy and repeatability.
In addition, by using a pressure-sensitive adhesive, an antistatic agent, a release treatment agent, or an antifouling treatment agent as the coating liquid 12, it becomes possible to produce laminated sheets used for various applications.
Moreover, in the laminated sheet manufactured by the coating apparatus 1, by using only one coating apparatus, it becomes possible to uniformly apply various types of laminated sheets in the width direction. Reduction can be achieved.

It is a perspective view which shows schematic structure of the coating device which concerns on this embodiment. It is the front view which showed the die | dye which concerns on this embodiment. It is the side view which showed the die | dye which concerns on this embodiment. It is arrow sectional drawing which cut | disconnected the die | dye by line AA of FIG. It is the table | surface which showed the evaluation result of the laminated sheet manufactured in Example 1- Example 4 and Comparative Example 1- Comparative Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating device 2 Die 11 Web 12 Coating liquid 22 Feed block 23 Upstream cavity block 24 Downstream cavity block 25 Upstream height block 26 Downstream height block 29 Bar 30, 31 Support block 33 Drive motor 37 Upstream supply groove 40 Downstream supply groove

Claims (6)

In a coating apparatus that applies a coating liquid to a continuously running web,
A feed block,
An upstream cavity block and a downstream cavity block disposed to face the upstream side surface and the downstream side surface of the feed block in the web conveyance direction, respectively;
An upstream supply groove that is formed by a gap between the feed block and the upstream cavity block, and that supplies a coating liquid from an upstream side in the web conveyance direction;
A downstream supply groove that is formed by a gap between the feed block and the downstream cavity block, and that supplies a coating liquid from the downstream side in the web conveyance direction;
A bar that is rotatably supported between the feed block and the web, and that applies the coating liquid supplied from the upstream supply groove and the downstream supply groove to the web in accordance with a rotational movement;
A support member for rotatably supporting the bar;
A driving device for rotationally driving the bar;
An upstream height block that is sandwiched between the feed block and the upstream cavity block and determines a groove width of the upstream supply groove based on a block width with respect to a groove width direction of the upstream supply groove;
A downstream height block that is sandwiched between the feed block and the downstream cavity block and determines a groove width of the downstream supply groove based on a block width with respect to a groove width direction of the downstream supply groove. apparatus. The upstream height block and the downstream height block are composed of a plurality of types of blocks having different block widths with respect to the groove width direction of the supply groove,
The coating apparatus according to claim 1, wherein a groove width of the upstream supply groove and the downstream supply groove is changed by exchanging the upstream height block and the downstream height block.   The coating apparatus according to claim 1 or 2, wherein a groove width of the upstream supply groove and the downstream supply groove can be adjusted in units of 50 µm, and a dimensional tolerance of the groove width is within ± 2.5 µm. .   The upstream height block and the downstream height block have a thickness in the groove width direction of the upstream supply groove and the downstream supply groove of 5 to 20 mm, and a flatness of 2/1000 to 1/100 mm. The coating apparatus according to claim 1.   5. The coating apparatus according to claim 1, wherein the coating liquid to be applied is an adhesive, an antistatic agent, a release treatment agent, or an antifouling treatment agent.   A laminated sheet in which a film is formed in a laminated form by a coating solution applied by the coating apparatus according to any one of claims 1 to 5.

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