JP2013094731A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely avoid the contact of a coating head with an uncoated part of a support without complicated adjustment.SOLUTION: The coating head 15 has a slit 21 discharging a coating liquid and applies the coating liquid discharged from the slit on the surface of a support 11 continuously conveyed to a direction intersecting to the longitudinal direction of the slit. The coating head is provided with a passage structural member 37 forming a passage 35 of a pressurized fluid for blowing compressed fluid to the uncoated part 33 of the end part of the support in the width direction. The passage structural member is structured so that a member for forming at least a blow opening of the pressurized fluid is attached to the coating head as a single component.

Description

  The present invention relates to a coating apparatus.

  An extrusion coating method is known as a method of coating a coating liquid on the surface of a belt-like flexible support that is continuously conveyed. In the extrusion coating method, for example, the coating head is pressed against the support between guide rolls that guide the support, and the coating liquid discharged from the coating head is applied to the support.

  Typically, the support to which the coating solution is applied has a width of the coating portion to which the coating solution is applied is narrower than the width of the support, and the coating solution is not applied to both ends in the width direction of the support. It has a non-application part. The gap between the support and the coating head is extremely narrow, so that the non-coating portion of the support and the coating head may come into contact with each other. When the non-coating portion of the support and the coating head come into contact with each other, the surface of the support is scraped off, and shavings are generated. When this scrap is deposited on both ends of the coating head facing the non-coated portion of the support, both ends of the support are pushed up, and the thickness of the coating film near the non-coated portion increases in the coated portion of the support. The thickness of the coating film becomes non-uniform.

  In order to eliminate the above inconvenience, there is provided a coating apparatus configured to discharge a pressurized fluid from the coating head toward the non-coating portion of the support to avoid contact between the non-coating portion of the support and the coating head. It is known (see Patent Document 1).

JP-A-2-214567

  In the coating apparatus described in Patent Document 1, the flow path of the pressurized fluid discharged toward the non-application portion of the support is inserted into both longitudinal ends of the slit from which the application liquid of the application head is discharged, It is composed of a restricting plate that defines the length of the slit (the width of the coating portion on the support) and a spacer that is disposed outside the restricting plate with a predetermined gap from the restricting plate. A gap between the upper end surface of the regulating plate and the upper end surface of the spacer is configured as a pressurized fluid outlet.

  In the above configuration, the regulating plate and the spacer are never fixed in the slit. However, when these members are fixed to the coating head, the workability is not necessarily excellent, and therefore a positional shift may occur. And if the positional relationship between the upper end surfaces of the regulating plate and spacer constituting the discharge port is shifted, the flow of the pressurized fluid as intended can be obtained between the non-application portion of the support and the discharge port. There was a possibility that the non-application part of a support body and an application head might contact.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to reliably avoid contact between the non-application portion of the support and the application head without requiring complicated adjustment.

The present invention has the following configuration.
It has a slit for discharging the coating liquid, and comprises a coating head for coating the coating liquid discharged from the slit on the surface of the support that is continuously conveyed in the direction intersecting the longitudinal direction of the slit,
A flow path constituting member that forms a flow path of a pressurized fluid for spraying a pressurized fluid to a non-application portion at an end in the width direction of the support at each of both ends in the longitudinal direction of the coating head. Is provided,
The flow path constituting member is a coating apparatus configured such that at least a member that forms the outlet of the pressurized fluid is attached to the coating head as a single component.

  According to the present invention, the flow path component having a flow path for spraying the pressurized fluid onto the non-coated portion of the support can be easily arranged as designed without requiring complicated adjustment. The intended flow of the pressurized fluid can be easily obtained between the flow path component and the non-application portion of the support, and the contact between the non-application portion and the application head can be reliably avoided.

It is a block diagram of the coating device for demonstrating embodiment of this invention, and is a fragmentary sectional view in the application part of an extrusion-type application | coating head. FIG. 2 is a partial perspective view of the coating head shown in FIG. It is the partial cross section cut | disconnected by the cross section parallel to the slit of a coating head. It is a perspective view which shows a flow-path structural member alone. It is a perspective view of a channel constituent member formed by combining a plurality of plate materials. It is a perspective view of other channel constituent members. It is a top view which shows the groove | channel which notches a part of upper flat plate.

FIG. 1 is a configuration diagram of a coating apparatus for explaining an embodiment of the present invention. FIG. 2 is a partial sectional view of a coating portion of an extrusion type coating head, and FIG. 2 is a partial perspective view of the coating head shown in FIG. is there.
As shown in FIG. 1, the coating apparatus 100 mainly supplies a pair of guide rollers 13 and 13 that guide the traveling of the web 11 as a support, a coating head 15, and a coating liquid 17 to the coating head 15. And a liquid supply system 19.

  The web 11 is made of a flexible strip made of a plastic film such as polyethylene naphthalate (PET) having a width of 0.3 to 5 m, a length of 45 to 20000 m, and a thickness of 2 to 200 μm, or this strip. It is a strip having a processed layer formed on its surface as a base material. The web 11 is continuously transported by a transport mechanism such as guide rollers 13 and 13 in a direction crossing the longitudinal direction of the slit 21 of the coating head 15 (in the illustrated example, an arrow A direction perpendicular to the longitudinal direction of the slit). .

  The coating head 15 has a slit 21 for discharging the coating liquid 17, and the coating liquid 17 supplied to the coating pocket portion 23 is discharged from the slit 21 to apply the coating liquid 17 to the surface of the web 11. The slit 21 is formed by an upstream lip 25 and a downstream lip 27 of the coating head 15.

  As shown in FIG. 2, the coating head 15 has a dimension in the longitudinal direction wider than the width of the web 11, and a slit 21 for discharging the coating liquid is formed in the longitudinal direction. The slit 21 communicates with a coating pocket 23 formed inside the coating head 15, and the coating liquid 17 is supplied through a coating liquid supply port 31 provided in a side plate 29 on the side of the coating pocket 23. The The coating liquid 17 is discharged with a uniform pressure over the entire longitudinal direction of the slit 21.

  Further, a flow path constituting member 37 in which a flow path 35 of pressurized fluid for blowing pressurized air to the non-application portion 33 at the width direction end of the web 11 is formed at both ends in the longitudinal direction of the slit 21. It is provided. The flow path component 37 is provided so as to overlap the non-application portion 33 over the entire width of the non-application portion 33 of the web 11.

  Further, the flow path component member 37 is attached to the coating head 15 as a single component at least at a portion forming the flow path outlet portion 35b which is a blowout port of pressurized air. Thereby, the shape of the flow path 35 is kept constant without being affected by the error of the attachment position with respect to the coating head 15.

  Since the flow path constituting member 37 is inserted into both ends in the longitudinal direction of the slit 21, it also functions as an application width regulating plate that defines the length of the slit 21.

  FIG. 3 shows a partial cross-sectional view cut along a cross section parallel to the slit of the coating head. In the flow path 35 of the flow path component 37, a flow path inlet 35 a is connected to a pressurized air supply port 39 provided in the side plate 29. The pressurized air supply port 39 is connected to a pressurized air supply source (not shown) that supplies pressurized air, and pressurized air is supplied to the flow path 35. The flow path outlet 35b of the flow path 35 has a non-application portion of the web 11 at the tip of the vertical flow path 41 so that pressurized air can be blown out in a desired direction with respect to the surface of the web 11 to be conveyed. 33 is formed to face.

  In the case of this configuration example, the flow path component member 37 includes a flow path 35 including an inflow flow path section 43 from the flow path inlet section 35a, a direction changing flow path section 45, and a vertical flow path section 41. Then, the pressurized air is blown perpendicularly to the surface of the web 11 against the non-application portion 33 of the web 11.

  FIG. 4 is a perspective view showing a flow path component member alone. The flow path constituting member 37 is a plate-like body having front and back surfaces 47A and 47B parallel to each other, and is a single substrate in which a groove that becomes the flow path 35 is formed on one surface 47A. The groove is formed to a depth approximately half the thickness of the plate-like body, and the surface 47A is closed by the surface of the upstream lip 25 (see FIG. 1) that forms the slit 21 of the coating head 15. Thereby, the flow path 35 in which the grooves other than the flow path inlet 35a and the flow path outlet 35b are closed is formed.

  In addition, the flow path component 37 has the arrangement height of the upper end surface 49 where the flow path outlet 35b is formed and the height of the upper end surface edge of the coating head 15 (the upstream lip 25 or the tip of the downstream lip 27). It is preferable to arrange so that the difference from the above is 0 μm to 50 μm. More preferably, it is in the range of 0 μm to 2 μm. By setting to the said range, the flow of compressed air does not deviate in the width direction of the web 11, and the floating effect by the blowing of the pressurized air with respect to the non-application part 33 of the web 11 becomes favorable.

  By forming the front and back surfaces 47A and 47B, the upper end surface 49, the side surface 51, and the lower end surface 53 as surfaces having a high degree of straightness, the flow path component member 37 is formed with the surface on the coating head 15 side that comes into contact with these surfaces. It is possible to perform highly accurate positioning between the two. For example, mounting with accurate straightness is possible by abutting against the contact surface on the application head 15 side with reference to the side surface 51, the lower end surface 53, or both surfaces of the flow path component member 37.

  The flow path component member 37 is made of any material such as a resin material, a metal material, glass, or ceramics. When the material of the flow path component member 37 is a resin material, the processability is excellent, and even a complicated groove shape can be easily formed at low cost. In the case of using a metal material, it is possible to obtain a high strength configuration with little deterioration over time. Further, when glass or ceramics is used, even if various solutions such as a coating solution and a solvent are attached, they are chemically stable and thus are not damaged.

  According to the coating apparatus configured as described above, when the coating solution is applied to the web 11 to form the coating layer, the non-coating portion 33 where the coating layer is not formed at both ends in the width direction of the web 11 is blown out from the flow path outlet portion 35b. It is pushed up by the pressurized air and does not contact the upper end surface edge of the coating head 15. Therefore, the non-application portion 33 is scraped off by the upper end surface edge of the application head 15, and the scrap is not attached to both ends of the upper end surface edge. In addition, it is possible to prevent foreign matter adhering to the surface of the web 11 from being captured at both ends of the upper end surface edge of the coating head 15. As a result, foreign matter does not accumulate at both ends in the width direction of the coating head 15, and both ends in the width direction of the web 11 do not float, and a coating layer having a uniform thickness is formed on the web 11.

  In addition, since the flow path component member 37 is configured by a single component when attached to the application head 15, positioning of the attachment to the application head 15 can be performed easily and accurately. Therefore, the blowing direction of the pressurized air from the flow path outlet 35b can be set as designed, and the pressurized air can be flowed as intended. Further, by overlapping the flow path component member 37 over the non-application portion 33 over the entire width of the non-application portion 33, it is possible to reliably avoid contact between the non-application portion 33 and the upper end surface edge of the application head 15.

Next, another configuration example of the flow path component member 37 will be described.
FIG. 5 is a perspective view of a flow path component formed by combining a plurality of plates.
In this case, the flow path constituting member 37 </ b> A includes a substrate 55 and a plurality of plate-like members 57 and 59 fixed in advance on the surface of the substrate 55. And the groove | channel used as the above-mentioned flow path 35 is defined by the board | substrate 55 and the some plate-shaped member 57.59.

  That is, the substrate 55 is a plate material having the same outer dimensions, except that the thickness of the substrate 55 is approximately half that of the flow path constituting member 37A. The plate-like members 57 and 59 are formed to be approximately half the thickness of the flow path constituting member 37 </ b> A similarly to the substrate 55, and have the width of the flow path 35 on the substrate back surface 61 opposite to the front surface 47 </ b> A of the substrate 55. They are bonded and fixed at a corresponding interval. The substrate 55 and the plate-like members 57 and 59 after bonding do not change the shape of the groove that becomes the flow path 35 integrally.

  The substrate 55 and the plate-like members 57 and 59 can be made of any one of a resin material, a metal material, glass, ceramics, and the like. Moreover, you may comprise combining these.

  According to the configuration of the flow path component member 37A, the flow path 35 can be formed by a simple bonding process of the plate-like members 57 and 59, and material is not wasted compared with the case of forming a groove, and the production efficiency is improved. It can be improved. In addition, if plate members 57 and 59 are prepared in advance for each type of flow path 35 to be formed, these various plate members 57 and 59 can be selectively combined to use different shapes of flow. A path can be easily formed.

FIG. 6 is a perspective view of another flow path component.
The flow path component 37B includes an upper flat plate 67 having a flow path outlet portion 35b formed on the upper end surface 65 by an outlet flow path 63 penetrating the upper and lower surfaces, and a plate-like member 69 fixed to the upper flat plate 67, 71.

  The upper flat plate 67 is a component that is disposed to face the web 11 in the coating head 15 and has an outlet channel 63. The plate-like members 69 and 71 are fixed to the surface of the upper flat plate 67 opposite to the side facing the web 11 with an adhesive or the like. The plate-like members 69 and 71 are bonded to the upper flat plate 67 with a space therebetween to define the flow path 35. On the outlet side of the flow path 35, a flow path outlet portion 35b is disposed. That is, at least the upper flat plate 67 that forms the outlet for pressurized air is configured to be attached to the coating head as a single component.

  The outlet flow path 63 of the upper flat plate 67 is not limited to the perforated hole, and may be a groove 73 in which a part of the upper flat plate 67 is notched as shown in FIG. In any case, the shape of the outlet channel may be any as long as the upper flat plate 67 is composed of one part.

  According to the configuration of the flow path component 37B, the flow path outlet portion 35b of the flow path component 37B is configured by a single upper plate 67. It is defined by the arrangement state of the flat plate 67 on the coating head. That is, as long as the upper flat plate 67 is accurately positioned on the coating head, the direction in which the pressurized air is blown can be set as intended.

  Each of the flow path components 37, 37 A, and 37 B has a grooved surface blocked by either the upstream lip 25 or the downstream lip 27 of the coating head 15 that forms the slit 21. Attached to form a flow path. However, the flow path component member is not limited to this, and the flow path component member alone may constitute the flow path. For example, the same flow path as described above can be formed by drilling within the plate thickness of the flow path component. In this case, the flow path is formed by only the flow path component members, and the degree of freedom of arrangement on the coating head 15 is improved.

  As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make changes and applications based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. This is also the scope of the present invention, and is included in the scope for which protection is sought. In addition to the plastic film, the web may be a belt-like flexible support such as paper or metal foil. Various coating solutions such as a magnetic solution, a photographic photosensitive solution, and a surface protection solution can be used as the coating solution. Further, the pressurized air blown out from the flow path constituting member may be another gas such as low-humidity air or inert gas.

  Table 1 shows the results of comparison of the occurrence of failures using the flow path component configured to be divided into two parts at the time of attachment to the coating head and the flow path component configured as one part shown in FIG. Shown in Here, the flow path component was applied after being attached to the coating head, and thereafter, the flow path component was removed and reattached, and coating was performed again. This operation was carried out a plurality of times, and the occurrence of scraped webs during application and the disturbance of the application layer at the widthwise end (ear part) of the web were confirmed.

  As shown in the above results, stable application could be realized by using a one-part flow path component.

  As described above, the following coating apparatus is disclosed in this specification.

(1) It has a coating head which has a slit which discharges coating liquid, and coats the coating liquid discharged from the slit on the surface of a support which is continuously conveyed in the direction crossing the longitudinal direction of the slit ,
A flow path constituting member that forms a flow path of a pressurized fluid for spraying a pressurized fluid to a non-application portion at an end in the width direction of the support at each of both ends in the longitudinal direction of the coating head. Is provided,
The flow path constituting member is a coating apparatus configured such that at least a member that forms the outlet of the pressurized fluid is attached to the coating head as a single component.
(2) The coating apparatus according to (1),
The said flow-path structural member is a coating device provided so that it may overlap with this non-application part over the full width of the said non-application part.
(3) The coating apparatus according to (1) or (2),
The coating apparatus which is a member in which the member which forms the blowing outlet of the said pressurized fluid is a member which forms the surface facing the said support body.
(4) The coating apparatus according to any one of (1) to (3),
The said flow-path structural member is a coating device which is a coating width control board inserted in the longitudinal direction both ends of the said slit, and prescribes | regulates the length of the said slit.
(5) The coating apparatus according to any one of (1) to (4),
The flow path component member is a plate-like body in which a groove serving as the flow path is formed on one surface, and the groove is formed by any one of an upstream lip and a downstream lip of the coating head forming the slit. The coating apparatus attached in the state with which the surface in which it was formed was plugged.
(6) The coating apparatus according to (5),
The flow path constituting member is a coating apparatus which is a single substrate having the groove formed on the surface thereof.
(7) The coating apparatus according to (5),
The flow path constituting member is constituted by a substrate and a plurality of components fixed in advance on the surface of the substrate, and the groove is defined by the substrate and the plurality of components.
(8) The coating apparatus according to any one of (1) to (7),
The flow path constituting member is a coating apparatus installed such that a difference between an arrangement height of an upper end surface thereof and a height of an upper end surface edge of the coating head is in a range of 0 μm to 50 μm.
(9) The coating apparatus according to any one of (1) to (8),
The coating apparatus, wherein the pressurized fluid is a pressurized gas.

DESCRIPTION OF SYMBOLS 11 Web 15 Application | coating head 17 Application liquid 21 Slit 25 Upstream lip 27 Downstream lip 33 Non-application part 35 Channel 37 Channel configuration member 55 Substrate 57 Plate member 59 Plate member 65 Upper end surface 67 Upper flat plate 69 Plate member 71 Plate-shaped member 100 Coating device

Claims (9)

It has a slit for discharging the coating liquid, and comprises a coating head for coating the coating liquid discharged from the slit on the surface of the support that is continuously conveyed in the direction intersecting the longitudinal direction of the slit,
A flow path constituting member that forms a flow path of a pressurized fluid for spraying a pressurized fluid to a non-application portion at an end in the width direction of the support at each of both ends in the longitudinal direction of the coating head. Is provided,
The flow path constituting member is a coating apparatus configured such that at least a member that forms the outlet of the pressurized fluid is attached to the coating head as a single component. The coating apparatus according to claim 1,
The said flow-path structural member is a coating device provided so that it may overlap with this non-application part over the full width of the said non-application part. The coating apparatus according to claim 1 or 2,
The coating apparatus which is a member in which the member which forms the blowing outlet of the said pressurized fluid is a member which forms the surface facing the said support body. It is a coating device as described in any one of Claims 1-3,
The said flow-path structural member is a coating device which is a coating width control board inserted in the longitudinal direction both ends of the said slit, and prescribes | regulates the length of the said slit. It is a coating device as described in any one of Claims 1-4, Comprising:
The flow path component member is a plate-like body in which a groove serving as the flow path is formed on one surface, and the groove is formed by any one of an upstream lip and a downstream lip of the coating head forming the slit. The coating apparatus attached in the state with which the formed surface was plugged. The coating apparatus according to claim 5, wherein
The flow path constituting member is a coating apparatus which is a single substrate having the groove formed on the surface thereof. The coating apparatus according to claim 5, wherein
The flow path constituting member is constituted by a substrate and a plurality of components fixed in advance on the surface of the substrate, and the groove is defined by the substrate and the plurality of components. It is a coating device as described in any one of Claims 1-7,
The flow path constituting member is a coating apparatus installed such that a difference between an arrangement height of an upper end surface thereof and a height of an upper end surface edge of the coating head is in a range of 0 μm to 50 μm. It is a coating device as described in any one of Claims 1-8, Comprising:
The coating apparatus, wherein the pressurized fluid is a pressurized gas.

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