JP2013126633A - Coating film forming apparatus, and coating film forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating film forming apparatus and a coating film forming method, which prevents a coating film formed on the center region in the width direction of a base material from sticking on the back side of the base material piled on the base material when the base material is taken up on a take-up roll, and which can provide the coating film with a good quality.SOLUTION: The coating film forming apparatus 10 has a coating liquid main supply part 16 to coat a coating liquid on the center region A in the width direction of the base material W continuously conveyed, and coating liquid end-part supply parts 18 to supply the coating liquid on end-part regions B on outer sides in the width direction of the center region A. The respective amounts of the coating liquid supplied on the base material W by the coating liquid main supply part 16 and the coating liquid end-part supply parts 18 are so set that the thickness of a coating film formed from the coating liquid coated on the base material W by the coating liquid end-part supply parts 18 becomes larger than that of the coating film formed from the coating liquid coated on the base material W by the coating liquid main supply part 16.

Description

  The present invention relates to a coating film forming apparatus and a coating film forming method for forming a coating film on a substrate such as an optical film or web that is continuously conveyed, and in particular, the substrate is wound on a winding roll. Sometimes, it is possible to prevent the coating film formed in the central region in the width direction of the substrate from sticking to the back side of the substrate stacked on this substrate, and to obtain a good quality of the coating film The present invention relates to a coating film forming apparatus and a coating film forming method.

  2. Description of the Related Art Conventionally, various types of coating film forming apparatuses that form a coating film on a substrate such as an optical film and a web that are continuously conveyed are known. In a conventional coating film forming apparatus, for example, when manufacturing an optical film used for a liquid crystal display device or the like, when a coating film is formed on a substrate unwound from an unwinding roll and an attempt is made to wind up by a winding roll, When the substrate is wound, the coating film on the substrate is stuck to the back surface of the substrate that is overlaid on the substrate, resulting in a problem that the quality of the coating film is impaired. For this reason, conventionally, when winding the substrate with a take-up roll, side tape is sandwiched between both ends in the width direction of the substrate, or intermediate paper is entirely sandwiched on the coating film formed on the substrate. By doing, it prevents that a coating film adheres to the back surface of a base material. In addition, as disclosed in Patent Document 1 and the like, a gap is formed between the substrates wound by the winding roll by using a substrate in which irregularities are formed at both ends, and the substrate There is known a method for preventing a coating film from sticking to the back surface of the film.

JP 2002-187148 A

  However, at the time of winding the substrate with a winding roll, the side tape is sandwiched between both ends in the width direction of the substrate, or the intermediate paper is entirely sandwiched on the coating film formed on the substrate, There is a problem that a process for removing these side tapes and intermediate paper must be prepared. In addition, when using a base material with irregularities formed at both ends, the height of the irregularities must be changed depending on the thickness of the coating film formed on the substrate, which is troublesome. There is.

  The present invention has been made in consideration of such points, and a coating film having a thickness larger than the thickness of the coating film formed from the coating solution applied to the central region in the width direction of the substrate is used. When the base material is wound around the winding roll, the coating film formed in the central region in the width direction of the base material is overlaid on the base material. An object of the present invention is to provide a coating film forming apparatus and a coating film forming method capable of preventing sticking to the back side and obtaining a good quality of the coating film.

  The coating film forming apparatus of the present invention includes a coating liquid main supply unit that applies a coating liquid to a central region in the width direction of a substrate that is continuously conveyed, and the coating liquid main supply unit in the substrate. A coating liquid supply section for supplying an end part to an end area outside the width direction of the area to be coated, the main supply section for coating liquid and the coating liquid for end section in the transport direction of the substrate A coating film forming section that is provided on the downstream side of the supply section and cures the coating liquid on the base material to form a coating film, and is applied to the base material by the end coating liquid supply section The coating liquid main supply section and the coating liquid main supply section so that the thickness of the coating film formed from the coating liquid is larger than the thickness of the coating film formed from the coating liquid applied to the substrate by the coating liquid main supply section. The amount of the coating liquid supplied to the substrate by the coating liquid supply unit for the end portion is Wherein the it is being set.

  According to such a coating film forming apparatus, the coating liquid supply unit for the end portion that supplies the coating liquid to the end region on the outer side in the width direction of the region where the coating liquid is to be applied by the coating liquid main supply unit in the base material The thickness of the coating film formed from the coating solution applied to the substrate by the coating solution supply unit for the end portion is formed from the coating solution applied to the substrate by the coating solution main supply unit. The amount of the coating liquid supplied to the substrate by the coating liquid main supply section and the end coating liquid supply section is set so as to be larger than the thickness of the coating film. As a result, when the coating liquid supplied onto the substrate from the coating liquid main supply section and the end coating liquid supply section is cured by the coating film forming section, it is formed in the central region in the width direction of the substrate. The thickness of the coating film formed in the end region is larger than that of the coating film. For this reason, when the substrate is wound on the winding roll, the coating film formed in the end region of the substrate comes into contact with the back surface of the substrate stacked on the substrate. The coating film formed in the region does not come into contact with the back surface of the base material superimposed on the base material. Therefore, it can prevent that the coating film formed in the center area | region in a base material adheres to the back side of the base material piled up on this base material, and can obtain the favorable quality of a coating film.

  In the coating film forming apparatus of the present invention, the end coating liquid supply section may be connected to the coating liquid main supply section.

  At this time, the coating liquid main supply section and the end coating liquid supply section are integrated, and communicates with each other inside the coating liquid main supply section and the end coating liquid supply section. Each of the coating liquid supply passages may be provided.

  In the coating film forming apparatus of the present invention, the end portion coating liquid supply section may be provided on the upstream side of the coating liquid main supply section in the transport direction of the substrate.

  Alternatively, the end coating liquid supply unit may be provided separately on the downstream side of the coating liquid main supply unit in the transport direction of the base material.

  In the coating film forming apparatus of the present invention, the coating film forming unit may be a drying unit that forms a coating film by drying and curing the coating solution on the substrate.

  The coating film forming method of the present invention includes a coating liquid main supply step for applying a coating liquid to a central region in the width direction of a continuously conveyed substrate, and a coating liquid in the coating liquid main supply step for the substrate. In the edge coating liquid supply step for supplying the coating liquid to the edge region outside the width direction of the region to be coated, the base material in the coating liquid main supply step and the edge coating liquid supply step, respectively. A coating film forming step of curing the coating solution on the substrate to form a coating film after the coating solution is supplied to the substrate, and the coating solution was applied to the substrate in the coating liquid supply step for the end portion The coating liquid main supply step and the coating liquid main supply step so that the thickness of the coating film formed from the coating solution is larger than the thickness of the coating film formed from the coating solution applied to the substrate in the coating liquid main supply step. In the coating liquid supply step for the end portion, Wherein the amount of the coating liquid supplied to the timber are set.

  According to such a coating film forming method, the coating liquid is supplied to the end region on the outer side in the width direction of the region where the coating liquid is to be applied in the coating liquid main supply step in the base material in the coating liquid supply step for the end portion. The thickness of the coating film formed from the coating solution applied to the substrate in the edge coating solution supply step is formed from the coating solution applied to the substrate in the coating solution main supply step. The amount of the coating liquid supplied to the substrate in the coating liquid main supply process and the edge coating liquid supply process is set so as to be larger than the thickness of the coating film to be formed. Thus, when the coating liquid supplied onto the substrate in the coating liquid main supply process and the edge coating liquid supply process is cured in the coating film forming process, it is formed in the central region in the width direction of the substrate. The thickness of the coating film formed in the end region is larger than that of the coating film. For this reason, when the substrate is wound on the winding roll, the coating film formed in the end region of the substrate comes into contact with the back surface of the substrate stacked on the substrate. The coating film formed in the region does not come into contact with the back surface of the base material superimposed on the base material. Therefore, it can prevent that the coating film formed in the center area | region in a base material adheres to the back side of the base material piled up on this base material, and can obtain the favorable quality of a coating film.

  According to the coating film forming apparatus and the coating film forming method of the present invention, when the substrate is wound on the winding roll, the coating film formed in the center region in the width direction of the substrate is overlaid on the substrate. It can prevent sticking to the back side of a base material, and can obtain the favorable quality of a coating film.

It is a block diagram which shows the outline of a structure of the coating-film formation apparatus by embodiment of this invention. It is a perspective view of the coating liquid main supply part and the coating liquid supply part for edge parts in the coating-film formation apparatus shown in FIG. It is a longitudinal cross-sectional view of the coating liquid main supply part and the edge coating liquid supply part shown in FIG. It is a block diagram which shows the outline of the other structure of the coating-film formation apparatus by embodiment of this invention. It is a block diagram which shows the outline of other structure of the coating-film formation apparatus by embodiment of this invention. It is a perspective view of the coating liquid main supply part and the coating liquid supply part for edge parts in the coating-film formation apparatus shown in FIG. It is a perspective view which shows the structure of the coating liquid supply part for edge parts of a slide curtain system. In the example, when the base material is wound on the winding roll, whether or not the coating film formed in the central region of the base material is stuck to the back side of the base material stacked on this base material is determined. It is a table | surface which shows the confirmed result.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are diagrams showing an embodiment of a coating film forming apparatus according to the present invention. Among these, FIG. 1 is a block diagram which shows the outline of a structure of the coating-film formation apparatus by this Embodiment, and FIG. 2 is a coating liquid main supply part and edge part application | coating in the coating-film formation apparatus shown in FIG. FIG. 3 is a perspective view of the liquid supply unit, and FIG. 3 is a longitudinal sectional view of the coating liquid main supply unit and the end coating liquid supply unit shown in FIG. Moreover, FIG. 4 is a block diagram which shows the outline of the other structure of the coating-film formation apparatus by this Embodiment. FIG. 5 is a block diagram showing an outline of still another configuration of the coating film forming apparatus according to the present embodiment, and FIG. 6 is a coating liquid main supply unit and an end of the coating film forming apparatus shown in FIG. It is a perspective view of the coating liquid supply part. FIG. 7 is a perspective view showing a configuration of a slide curtain type coating liquid supply unit for an end portion.

  One mode of the coating film forming apparatus 10 in the present embodiment will be described with reference to FIGS. 1 to 3. The coating film forming apparatus 10 shown in FIG. 1 is an unwinding roll 12 that unwinds a substrate W such as an optical film, and a center region in the width direction of the substrate W that is unwound from the unwinding roll 12 and continuously conveyed. A coating film is formed by the coating liquid main supply unit 16 that coats the coating liquid, the coating film forming unit 20 that cures the coating liquid on the substrate W to form a coating film, and the coating film forming unit 20. And a take-up roll 14 for taking up the substrate W.

  Further, in the coating film forming apparatus 10 of the present embodiment, an end for supplying the coating liquid to the end region on the outer side in the width direction of the region where the coating liquid is to be applied by the coating liquid main supply unit 16 in the substrate W. A partial coating liquid supply unit 18 is provided. As shown in FIG. 2, two end coating liquid supply units 18 are provided, and these end coating liquid supply units 18 are connected to both ends of the coating liquid main supply unit 16.

  The configuration of the coating liquid main supply unit 16 will be described in detail with reference to FIGS. As shown in FIGS. 2 and 3, the coating liquid main supply unit 16 is of a slot die type, for example, and a coating liquid supply pipe 17 is connected to the upper surface of the coating liquid main supply unit 16. Further, as shown in FIG. 3, a coating liquid supply passage 16a is formed inside the coating liquid main supply section 16, and the coating liquid is supplied from the coating liquid supply pipe 17 to the coating liquid supply passage 16a of the coating liquid main supply section 16. Is to be supplied. Further, a coating liquid discharge port 16b having a small width in the direction orthogonal to the paper surface of FIG. 3 is provided at the lower portion of the coating liquid supply passage 16a, and the drawing is provided from the coating liquid supply passage 16a through the coating liquid discharge port 16b. The coating liquid is discharged downward in FIG. As shown in FIG. 2, the coating liquid main supply unit 16 applies the coating liquid to the central region A in the width direction of the substrate W.

  The configuration of each end coating liquid supply unit 18 connected to both ends of the coating liquid main supply unit 16 will be described in detail with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, each end coating solution supply section 18 is of a slot die type, for example, and a coating solution supply passage 18a is formed inside each end coating solution supply section 18. ing. The coating liquid is sent from the coating liquid supply passage 16a of the coating liquid main supply section 16 to these coating liquid supply passages 18a. Further, a coating liquid discharge port 18b having a small width in the direction orthogonal to the paper surface of FIG. 3 is provided at the lower portion of the coating liquid supply passage 18a, and the drawing is provided from the coating liquid supply passage 18a through the coating liquid discharge port 18b. The coating liquid is discharged downward in FIG. As shown in FIG. 2, each end coating liquid supply unit 18 is applied to the end region B on the outer side in the width direction of the region A to which the coating liquid is to be applied by the coating liquid main supply unit 16 in the substrate W. The liquid is supplied.

  2 and 3, the coating liquid main supply unit 16 and the end coating liquid supply unit 18 are integrated, and the coating liquid main supply unit 16 and the end coating liquid are integrated. Application liquid supply passages 16 a and 18 a communicating with each other are provided inside the supply unit 18.

  As shown in FIG. 1, the coating liquid on the substrate W is disposed downstream of the coating liquid main supply unit 16 and the end coating liquid supply unit 18 in the conveyance direction of the substrate W (indicated by arrows in FIG. 1). The coating film formation part 20 which hardens | cures and forms a coating film is provided. The coating film forming unit 20 is configured to cure the coating solution supplied onto the substrate W from the coating solution main supply unit 16 and the end coating solution supply unit 18. As the coating film forming unit 20, for example, a dryer that forms a coating film by drying and curing a coating solution on the substrate W is used. The coating film forming unit 20 is not limited to a dryer, and any other type can be used as long as the coating liquid on the substrate W can be cured to form a coating film. Good. For example, what hardens the coating liquid on the base material W by heat or light energy may be used as the coating film forming unit 20.

  In the coating film forming apparatus 10 of the present embodiment, the coating liquid main supply unit 16 determines the thickness of the coating film formed from the coating liquid applied to the substrate W by the edge coating liquid supply unit 18. The amount of the coating solution supplied to the substrate W by the coating solution main supply unit 16 and the end coating solution supply unit 18 is larger than the thickness of the coating film formed from the coating solution applied to the material W. Each is set. Specifically, as shown in FIG. 3, the cross-sectional area of the coating liquid supply passage 18a provided inside the end portion coating liquid supply section 18 (which is orthogonal to the paper surface of FIG. 3 and extends in the vertical direction of FIG. 3). (Cross-sectional area on the surface) is larger than the cross-sectional area of the coating liquid supply passage 16a provided in the coating liquid main supply unit 16 (cross-sectional area on the surface orthogonal to the paper surface of FIG. 3 and extending in the vertical direction of FIG. 3). For this reason, a pressure difference is generated between the coating liquid in the coating liquid supply passage 16a and the coating liquid in the coating liquid supply passage 18a, so that the end portion coating liquid supply per unit area of the substrate W is supplied. The amount of the coating liquid discharged from the part 18 to the substrate W becomes larger than the amount of the coating liquid discharged from the coating liquid main supply unit 16 to the substrate W. As a result, when the coating liquid supplied onto the substrate W from the coating liquid main supply unit 16 and the end coating solution supply unit 18 is cured by the coating film forming unit 20, the center in the width direction of the substrate W is obtained. The thickness of the coating film formed in the end region B is larger than that of the coating film formed in the region A. More specifically, it is preferable that the thickness of the coating film formed in the end region B of the substrate W is 1 μm or more larger than the thickness of the coating film formed in the central region A.

  When the thickness of the coating film formed in the end region B of the substrate W is larger than the thickness of the coating film formed in the center region A, when the substrate W is wound around the winding roll 14 The coating film formed in the end region B of the substrate W is in contact with the back surface of the substrate W superimposed on the substrate W, but the coating film formed in the central region A of the substrate W is this It does not come into contact with the back surface of the base material W stacked on the base material W. Here, in the base material W wound up by the winding roll 14, what is actually used in the post process is a portion of the central region A in the base material W, and a portion of the end region B in the base material W is It is cut out from the base material W and is not actually used in a subsequent process. For this reason, when the base material W is wound up by the winding roll 14, the coating film formed in the center area | region A in the base material W will stick on the back side of the base material W piled up on this base material W. If this can be prevented, the said base material W can be used without a problem by a post process, and the favorable quality of a coating film can be obtained.

  As described above, according to the coating film forming apparatus 10 and the coating film forming method of the present embodiment, the edge on the outer side in the width direction of the region A to which the coating liquid is to be applied by the coating liquid main supply unit 16 in the substrate W. The coating liquid supply part 18 for supplying the coating liquid to the part area B is provided, and the thickness of the coating film formed from the coating liquid applied to the substrate W by the coating liquid supply part 18 for edge part Is larger than the thickness of the coating film formed from the coating solution applied to the substrate W by the coating solution main supply unit 16 by the coating solution main supply unit 16 and the end coating solution supply unit 18. The amount of coating solution supplied to W is set. As a result, when the coating liquid supplied onto the substrate W from the coating liquid main supply unit 16 and the end coating solution supply unit 18 is cured by the coating film forming unit 20, the center in the width direction of the substrate W is obtained. The thickness of the coating film formed in the end region B is larger than that of the coating film formed in the region A. For this reason, when the base material W is wound up by the winding roll 14, the coating film formed in the edge part area | region B in the base material W contacts with the back surface of the base material W piled up on this base material W. However, the coating film formed in the central region A of the base material W does not come into contact with the back surface of the base material W stacked on the base material W. Therefore, it can prevent that the coating film formed in the center area | region A in the base material W sticks to the back side of the base material W piled up on this base material W, and obtains the favorable quality of a coating film. Can do.

  Further, in the coating film forming apparatus 10 and the coating film forming method of the present embodiment, as described above, the end coating liquid supply unit 18 is connected to the coating liquid main supply unit 16. More specifically, the coating solution main supply unit 16 and the end coating solution supply unit 18 are integrated, and the inside of the coating solution main supply unit 16 and the end coating solution supply unit 18 communicate with each other. Coating liquid supply passages 16a and 18a are provided.

  In addition, the coating-film formation apparatus 10 and coating-film formation method by this Embodiment are not limited to said aspect, A various change can be added.

  For example, the coating solution main supply unit 16 and the end coating solution supply unit 18 are not limited to being provided integrally. As another aspect, the end coating liquid supply unit 18 may be provided separately from the coating liquid main supply unit 16. In this case, the end coating solution supply unit 18 may be provided on the upstream side of the coating solution main supply unit 16 in the transport direction of the substrate W, or the end coating solution supply unit 18 may be You may provide in the downstream of the coating liquid main supply part 16 in the conveyance direction of the base material W. FIG. FIG. 4 is a configuration diagram showing a configuration in a case where the end coating liquid supply unit 18 is provided on the upstream side of the coating liquid main supply unit 16 in the conveyance direction of the substrate W. FIG. FIG. 6 is a configuration diagram showing a configuration in a case where the part coating liquid supply unit 18 is provided on the downstream side of the coating liquid main supply unit 16 in the conveyance direction of the substrate W. Further, FIG. 6 illustrates the coating liquid main supply unit 16 and the end portion when the end coating liquid supply unit 18 is provided on the downstream side of the coating liquid main supply unit 16 in the transport direction of the substrate W. 3 is a perspective view illustrating a configuration of a coating liquid supply unit 18. FIG. As shown in FIG. 6, even when the end coating liquid supply unit 18 is provided on the downstream side of the coating liquid main supply unit 16 in the transport direction of the substrate W, the end coating liquid supply unit 18. In the substrate W, the coating liquid is supplied to the end region B on the outer side in the width direction of the region A to which the coating liquid is to be applied by the coating liquid main supply unit 16. Further, in the embodiment shown in FIG. 6, each end coating solution supply unit 18 is provided separately from the coating solution main supply unit 16, so that the coating solution is also applied to the upper surface of each end coating solution supply unit 18. The supply pipe 19 is connected, and the coating liquid is supplied from the coating liquid supply pipe 19 to the inside of the end portion coating liquid supply section 18, so that the coating liquid is downward from the lower end portion of the end section coating liquid supply section 18. Is discharged.

  Even when the end portion coating liquid supply section 18 is connected to the coating liquid main supply section 16, the coating liquid supply passage 18 a of the end section coating liquid supply section 18 is connected to the coating liquid main supply section 16. These coating liquid supply passages 16a and 18a may be isolated from each other without communicating with the supply passage 16a. Also in this case, a coating liquid supply pipe (not shown) is connected to the upper surface of each end coating liquid supply section 18, and the coating liquid is supplied from the coating liquid supply pipe to the inside of the end coating liquid supply section 18. By being supplied, the coating liquid is discharged downward from the lower end portion of the end portion coating liquid supply section 18.

  Even when the coating liquid supply passage 18a of the end portion coating liquid supply section 18 and the coating liquid supply passage 16a of the coating liquid main supply section 16 are separated from each other, the end portion coating liquid supply section 18 causes the substrate W The coating liquid main is so formed that the thickness of the coating film formed from the coating liquid applied to the substrate is larger than the thickness of the coating film formed from the coating liquid applied to the substrate W by the coating liquid main supply unit 16. The amount of the coating solution supplied to the substrate W by the supply unit 16 and the end coating solution supply unit 18 is set.

  When the coating liquid supply passage 18 a of the end portion coating liquid supply section 18 is isolated from the coating liquid supply path 16 a of the coating liquid main supply section 16, the coating liquid supplied from the end coating liquid supply section 18. And the type of coating liquid supplied from the coating liquid main supply unit 16 can be different from each other. In this case, as the coating liquid supplied from the coating liquid supply unit 18 for the end part, a coating film formed by allowing the ink to contain slipperiness and curing the coating liquid is used as the base material. It is preferable to use a material that suppresses sticking to W. Since the coating liquid supplied from the end coating liquid supply unit 18 does not constitute a coating film on the base material W as the final product, strict quality is not required, and the coating liquid sticks to the base material W. Priority can be given to the difficulty.

  Further, the end coating liquid supply unit 18 is not limited to the slot die type. As long as the coating liquid can be supplied to the end region B in the width direction of the substrate W, an end coating liquid supply unit 18 having another configuration can be used. FIG. 7 is a perspective view showing a configuration of a coating film forming apparatus 10a using a slide curtain type as the coating liquid supply unit for the end portion. In the embodiment shown in FIG. 7, slide curtain type end coating liquid supply units 28 are connected to both ends of the coating liquid main supply unit 16, respectively. Thus, the coating liquid is supplied to the end region B on the outer side in the width direction of the central region A where the coating liquid is to be applied by the coating liquid main supply unit 16 in the substrate W. Even in the coating film forming apparatus 10a using the end coating liquid supply unit 28 of the slide curtain type as shown in FIG. 7, it is formed from the coating liquid applied to the substrate W by the end coating liquid supply unit 28. The coating liquid main supply unit 16 and the coating liquid for end portions are so thick that the thickness of the coating film to be formed is larger than the thickness of the coating film formed from the coating liquid applied to the substrate W by the coating liquid main supply unit 16. The amount of the coating liquid supplied to the substrate W by the supply unit 28 is set. Further, as the coating liquid supply unit 18 for the end portion, various configurations such as a roll coating method other than the slot die method and the slide curtain method may be used.

  When the coating film is formed on the substrate W by the coating film forming apparatus 10 shown in FIGS. 1 to 3 and the coating film forming apparatus 10a shown in FIG. It was confirmed whether or not the coating film formed in the central region A of the base material W had adhered to the back side of the base material W to be overlaid on the base material W. In the present embodiment, the thickness of the coating film formed from the coating liquid applied to the substrate W by the coating liquid main supply unit 16 is constant at 15 μm, and the substrate W is formed by the edge coating liquid supply units 18 and 28. The substrate W is applied to the substrate W by the coating liquid main supply unit 16 and the end coating solution supply units 18 and 28 so that the thickness of the coating film formed from the coating solution applied on the substrate changes to 14, 15, 16, and 17 μm. The amount of coating solution supplied was set for each.

  In this example, a PET film having a thickness of 50 μm and a width of 1000 mm was used as the substrate W. Further, a UV curable polyfunctional acrylate resin was used as a coating solution applied to the substrate W by the coating solution main supply unit 16. Further, as described above, the coating liquid main supply unit 16 causes the substrate W to have a constant thickness of 15 μm formed from the coating liquid applied to the substrate W by the coating liquid main supply unit 16. The amount of the coating solution supplied to was set. In addition, the width of the central region A in the width direction of the substrate W to which the coating liquid is to be supplied by the coating liquid main supply unit 16 is set to 800 mm.

  Further, in this example, a UV curable polyfunctional acrylate resin was used as the coating liquid applied to the substrate W by the edge coating liquid supply units 18 and 28. Further, as described above, the end thickness is changed so that the thickness of the coating film formed from the coating liquid applied to the substrate W by the edge coating liquid supply units 18 and 28 changes to 14, 15, 16, and 17 μm. The amount of the coating liquid supplied to the substrate W by the coating liquid supply units 18 and 28 for the part was set. Further, the width of the end region B of the base material W to which the coating solution is to be supplied by the end coating solution supply units 18 and 28 was set to 10 mm. Further, the winding tension of the substrate W by the winding roll 14 was set to 200N.

  8, the substrate W is wound around the winding roll 14 in the coating film forming apparatus 10 (slot die method) shown in FIGS. 1 to 3 and the coating film forming apparatus 10 a (slide curtain method) shown in FIG. 7. When it was done, the result of having confirmed whether the coating film formed in the center area | region A in the base material W has stuck on the back side of the base material W piled up on this base material W is shown. In the table shown in FIG. 8, “×” indicates that the coating film formed in the central region A of the base material W is stuck to the back side of the base material W to be overlaid on the base material W, and is applied to the base material W as a product. Indicates a problem. In addition, “◯” means that the coating film formed in the central region A of the base material W does not stick to the back side of the base material W to be overlaid on the base material W, and there is no problem with the base material W as a product. Is shown. As shown in the table of FIG. 8, the edge coating liquid supply unit 18 is applied from the coating liquid applied to the substrate W by the edge coating liquid supply unit 18 in both the slot die method and the slide curtain method. For the coating liquid main supply unit 16 and the end so that the thickness of the coating film to be formed is larger than the thickness of the coating film formed from the coating liquid applied to the substrate W by the coating liquid main supply unit 16 When the amount of the coating solution supplied to the substrate W by the coating solution supply unit 18 is set, the coating film formed in the central region A of the substrate W is overlapped with the substrate W. It was found that good quality of the coating film could be obtained without sticking to the back side. Thus, the thickness of the coating film formed from the coating liquid applied to the substrate W by the edge coating liquid supply unit 18 is different from the coating liquid applied to the substrate W by the coating liquid main supply unit 16. If the thickness of the coating film to be formed is at least 1 μm or more, the coating film formed in the central region A of the base material W may not stick to the back side of the base material W to be overlaid on the base material W. all right.

DESCRIPTION OF SYMBOLS 10, 10a Coating film formation apparatus 12 Unwinding roll 14 Winding roll 16 Coating liquid main supply part 17 Coating liquid supply pipe 18 End part coating liquid supply part 19 Coating liquid supply pipe 20 Coating film formation part 28 End part coating liquid Supply unit W base material

Claims (7)

A coating liquid main supply unit that applies the coating liquid to the central region in the width direction of the substrate that is continuously conveyed;
A coating liquid supply unit for an end portion that supplies the coating liquid to an end region that is on the outer side in the width direction of the region where the coating liquid is to be applied by the coating liquid main supply unit in the substrate;
A coating film forming unit that is provided on the downstream side of the coating liquid main supply unit and the edge coating solution supply unit in the transport direction of the substrate and cures the coating solution on the substrate to form a coating film; ,
With
The thickness of the coating film formed from the coating liquid applied to the substrate by the coating liquid supply unit for the end portion is a coating formed from the coating liquid applied to the substrate by the coating liquid main supply unit. Coating film formation characterized in that the amount of coating liquid supplied to the substrate is set by the coating liquid main supply section and the end coating liquid supply section so as to be larger than the thickness of the film. apparatus.   The coating film forming apparatus according to claim 1, wherein the coating liquid supply unit for the end portion is connected to the coating liquid main supply unit.   The coating liquid main supply section and the end coating liquid supply section are integrated, and the coating liquid supply passage communicates with each other inside the coating liquid main supply section and the end coating liquid supply section. The coating film forming apparatus according to claim 2, wherein each is provided.   2. The coating film forming apparatus according to claim 1, wherein the end portion coating liquid supply section is provided on the upstream side of the coating liquid main supply section in the transport direction of the substrate.   2. The coating film forming apparatus according to claim 1, wherein the end coating liquid supply unit is provided on the downstream side of the coating liquid main supply unit in the transport direction of the base material.   The coating film forming unit is a drying unit that forms a coating film by drying and curing the coating liquid on the base material. Film forming device. A coating liquid main supply step for applying the coating liquid to the central region in the width direction of the substrate that is continuously conveyed,
A coating liquid supplying step for supplying an application liquid to an end region on the outer side in the width direction of a region where the coating liquid is to be applied in the coating liquid main supplying step in the substrate;
A coating film forming process for curing the coating liquid on the substrate to form a coating film after the coating liquid is supplied to the substrate in each of the coating liquid main supplying process and the edge coating liquid supplying process; ,
With
The thickness of the coating film formed from the coating liquid applied to the substrate in the coating liquid supply process for the end portion is the coating thickness formed from the coating liquid applied to the substrate in the coating liquid main supply process. Coating film formation characterized in that the amount of coating liquid supplied to the substrate is set in each of the coating liquid main supplying step and the edge coating liquid supplying step so as to be larger than the thickness of the film Method.

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