JP2007296424A - Coating method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating method and device, wherein the quality of a coating film is prevented from becoming unstable due to volatilization of the coating liquid. <P>SOLUTION: The coating device 10 is provided with: a coating head 36 for applying the coating liquid to a support; coating liquid supply lines 56, 58 for circularly supplying the coating liquid to the coating head 36; supply pumps 66, 68; coating liquid circulation lines 60, 62; a cover member 80 for covering a coating liquid discharge part where the coating liquid is discharged upward for the coating head 36; and a moving cover member 90 for covering the coating head 36 of a preparatory state of coating work. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating method and apparatus, and more particularly to a coating method and apparatus for applying a solvent-based coating solution to a web such as a metal strip material.

  In recent plate making methods including electrophotographic plate making methods, lithographic printing plates such as photosensitive printing plates and heat-sensitive printing plates (hereinafter referred to as PS plates (Pre-Sensitized Plates)) are used to facilitate automation of the plate making process. Is widely used. The PS plate is subjected to hydrophilization surface treatment such as graining, etching, anodizing, silicate treatment, and other chemical conversion treatments in various surface treatment tanks on the surface of a support made of a sheet-like or coil-like aluminum plate. The process is carried out singly or in appropriate combination, followed by applying a photosensitive solution or a heat-sensitive solution and drying treatment, and then cutting to a desired size (see Patent Document 1).

  By the way, when manufacturing photosensitive materials, photoengraving materials, magnetic recording materials, recording paper materials, etc., including PS plates, webs such as thin metal plates, paper, and films are continuously run in the longitudinal direction. Various coating solutions are applied. As a coating method for performing such coating, a bar is used in which a coating bar is brought into contact with the coating surface of an object to be coated using a rod coater, and the bar is rotated while supplying a coating liquid to the bar surface. Application methods are well known. In the bar coating method, it is generally performed to supply an excessive amount of coating solution and to measure the excess amount of the coating solution by scraping it off with a bar (see Patent Document 2).

On the other hand, there is known a circulation type coating apparatus that stores an excessive coating liquid in a liquid reservoir of a coating head and circulates and supplies the stored coating liquid to the coating head (see Patent Document 3).
JP 2002-240455 A JP 2003-93948 A JP-A-9-70568

  However, in the circulation type coating apparatus, the solvent gradually volatilizes from the coating head and the concentration of the coating liquid increases, so that the coating dry film amount on the web increases as the coating time increases. Accordingly, when a long web is applied with a conventional apparatus, the coating amount varies in the longitudinal direction, and it is difficult to provide a product with stable quality.

  In order to prevent such inconvenience, a viscosity adjusting chamber for adding a solvent to the circulation line of the coating liquid is necessary as in Patent Document 3 described above. There was a problem that the line speed could not be increased.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a coating method and apparatus that prevent the coating quality from becoming unstable due to volatilization of the coating liquid.

  In order to achieve the above object, the first aspect of the present invention applies the coating liquid to the support (object to be coated) by the coating head, collects a part of the coating liquid, and circulates the coating liquid to the coating head. The coating method is characterized in that the coating is performed while covering the coating liquid opening portion of the coating head in the coating operation state where the coating liquid is opened upward with a cover member.

  In order to achieve the above-mentioned object, the invention according to claim 5 applies a coating liquid to a support, and has a coating head having a coating liquid release portion that opens the coating liquid upward in a coating operation state, and A circulation supply unit that collects a part of the coating liquid of the coating head and circulates and supplies the coating liquid to the coating head, and a cover member that covers the coating liquid release portion of the coating head are provided.

  According to the first and fifth aspects of the present invention, since the cover member is provided to cover the coating liquid opening portion of the coating head, the open area is reduced, and volatilization of the coating liquid can be suppressed. Therefore, according to the first and fifth aspects of the invention, a change in the concentration of the coating solution can be suppressed, so that an increase in the coating dry film amount can be prevented, and stable and high-quality coating can always be performed.

  In order to achieve the above object, the invention according to claim 2 is a coating method in which a coating liquid is applied to a support by a coating head, and a part of the coating liquid is collected and circulated to the coating head. In a coating preparation state in which the coating head is retracted from the support, a movable cover member is disposed on the upper surface of the coating head to cover the upper surface, and the movable cover member is retracted from the upper surface of the head, and The coating operation is performed by bringing the coating head close to the support.

  In order to achieve the above-mentioned object, the invention according to claim 6 applies the coating liquid to the support, and applies the coating head to the support in a coating preparation state and the coating head. A circulation supply unit that collects a part of the coating liquid and circulates and supplies the coating head to the coating head, a moving cover member that covers the top surface of the coating head in the coating preparation state, and a cover member that covers the top surface of the coating head. And a moving means for moving between a covering position and a separating position separated from the coating head.

  According to the second and sixth aspects of the invention, since the movable cover member is disposed at the coating position in the coating preparation state so that the support side surface of the coating head is covered with the moving cover member, the coating liquid in the coating preparation state Volatilization can be prevented. Thereby, since the change in the concentration of the coating liquid can be prevented, an increase in the coating dry film amount can be prevented, and more stable coating of quality can be performed. The coating preparation state is a state in which the coating liquid is circulated and supplied to the coating head, and the coating head is retracted from the support and separated.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the coating solution is an organic solvent-based coating solution. The present invention can achieve a particularly great effect when an organic solvent-based coating liquid having a large volatilization amount is used.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the temperature of the atmosphere in which the coating is performed is controlled according to the temperature of the coating solution. According to the invention of claim 4, since the atmospheric temperature of the application is controlled according to the temperature of the application liquid, volatilization of the application liquid can be more effectively suppressed.

  According to the present invention, the cover member is provided to cover the coating liquid opening portion of the coating head to reduce the open portion, or the support head side surface of the coating head is covered with the movable cover member in the coating preparation state. Volatilization can be suppressed, and a change in the concentration of the coating solution can be suppressed, and stable and high-quality coating can be performed at all times.

  Hereinafter, preferred embodiments of a coating method and apparatus according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing the main configuration of a coating apparatus 10 according to the present invention. 2 and 3 respectively show the application head in the application operation state and the application head in the application preparation state.

  The coating apparatus 10 is an apparatus for applying an organic solvent-based coating liquid to a web (band-shaped support) 12 made of aluminum or the like, and mainly includes a feeding section 22, a coating section 24, a drying section 26, and a winding section. 28. A web roll 30 in which the web 12 is wound in a roll shape is set in the delivery unit 22, and the web 12 is sent out from the web roll 30. The fed web 12 is coated with a coating solution by the coating unit 24, and then dried with the drying unit 26, and is wound into a roll by the winding unit 28. The configuration of the coating apparatus 10 is not limited to this, and a plurality of coating units 24 and drying units 26 may be repeatedly provided, or other processes such as a cutting process may be provided before the winding unit 28. Good.

  The application unit 24 is installed inside the application chamber 14 as shown in FIG. The coating chamber 14 is connected to the air conditioner 18 via the circulation duct 16, and the air in the coating chamber 14 is circulated to the circulation duct 16 and the circulating air is adjusted to a constant temperature and humidity by the air conditioner 18. Yes. Thereby, the internal temperature of the coating chamber 14 can be kept constant. In addition, the air conditioner 18 is controlled by the control apparatus 20 mentioned later, and the temperature of the coating chamber 14 is controlled according to the temperature of a coating liquid.

  As shown in FIGS. 2 and 3, the application unit 24 includes a pair of support rollers 32, 32 that are rotatably supported, a pressing roller 34 disposed between the pair of support rollers 32, 32, and an application head. 36. The pressing roller 34 is disposed on the opposite side (upper side) of the coating head 36 with the web 12 interposed therebetween, and is rotatably supported. Further, the pressing roller 34 is in a position in contact with the web 12 so as not to impair the planarity of the web 12 between the support rollers 32 and 32 in the application preparation state shown in FIG. 3, and in the application operation state shown in FIG. The web 12 is configured to bend up and down. Since the moving web 12 is restricted from moving in the vertical direction (thickness direction) by the pressing roller 34 and the coating head 36, the web 12 can be prevented from fluttering.

  The coating head 36 includes a bar 38 that contacts the web 12 from below. The bar 38 is formed in a substantially columnar shape (or cylindrical shape), and its longitudinal direction is arranged in the width direction of the web 12. The bar 38 is supported in a rotatable state by a bearing member 40 having an upper surface formed in an arc shape. The bar 38 may be rotationally driven in the traveling direction of the web 12 or in the direction opposite to the traveling direction.

  Weir plates 42 and 44 are provided on the upstream side and the downstream side, respectively, in the running direction of the web 12 with respect to the bearing member 40. The weir plates 42 and 44 are disposed with a predetermined gap with respect to the bearing member 40, and the coating liquid supply paths 46 and 48 are configured by this gap. Application liquid supply lines 56 and 58 described later are connected to the application liquid supply paths 46 and 48.

  On the top of the weir plates 42 and 44, inclined surfaces 42a and 44a are formed which are higher on the bearing member 40 side and lower as the distance from the bearing member 40 increases. Accordingly, the excessive coating liquid from the bearing member 40 side flows down to the upstream side of the dam plate 42 via the inclined surface 42a or to the downstream side of the dam plate 44 via the inclined surface 44a.

  The bearing member 40 and the dam plates 42 and 44 described above are integrally held by a holder 50. The holder 50 is formed in a concave shape, and includes side plates 50 a and 50 a erected on the upstream side of the dam plate 42 and the downstream side of the dam plate 44. The holder 50 has side plates (only one shown) 50b attached to both side surfaces of the web 12 in the width direction. Thereby, on the upstream side of the dam plate 42, a liquid reservoir 52 surrounded by the dam plate 42 and the side plates 50 a, 50 b, 50 b and opened upward is formed, and the coating that has flowed down from the inclined surface 42 a of the dam plate 42 is formed. The liquid can be stored in the liquid reservoir 52. Similarly, on the downstream side of the dam plate 44, a liquid reservoir portion 54 is formed that is surrounded by the dam plate 44 and the side plates 50a, 50b, and 50b and is opened upward, and the coating flows down from the inclined surface 44a of the dam plate 44. The liquid can be stored in the liquid reservoir 54.

  Application liquid circulation lines 60 and 62 are connected to the liquid reservoirs 52 and 54. The leading ends of the coating liquid circulation lines 60 and 62 are connected to a closed coating liquid tank 64 shown in FIG. 1, and the coating liquid in the liquid reservoirs 52 and 54 is applied via the coating liquid circulation lines 60 and 62. Circulated to the liquid tank 64.

  The coating liquid supply lines 56 and 58 are connected to the coating liquid tank 64, and supply pumps 66 and 68 are disposed in the coating liquid supply lines 56 and 58, respectively. Accordingly, by driving the supply pumps 66 and 68, the coating liquid stored in the coating liquid tank 64 is applied to the coating liquid supply paths 46 and 48 of the coating head 36 via the coating liquid supply lines 56 and 58 (FIG. 2). , See FIG. 3). The supply pumps 66 and 68 are connected to the control device 20, and the supply amount and the circulation amount of the coating liquid are controlled by the control device 20. Also, means for collecting and removing foreign matter in the coating liquid (for example, a filter) and viscosity for adjusting the viscosity of the coating liquid in the coating liquid supply lines 56 and 58, the coating liquid circulation lines 60 and 62, or the coating liquid tank 64. Adjustment means may be provided.

  The coating liquid tank 64 stores an organic solvent based coating liquid. The organic solvent-based coating liquid is mainly composed of an organic solvent. Examples of the organic solvent include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, isophorone, tetrahydrofuran, and the like in any ratio. , Ethanol, propanol, butanol, isobutyl alcohol, isopropyl alcohol, methylcyclohexanol, and other alcohols, methyl acetate, butyl acetate, isobutyl acetate, isopropyl acetate, ethyl lactate, glycol acetate, glycol dimethyl ether, glycol monoethyl Glycol ethers such as ether and dioxane, aromatic hydrocarbons such as benzene, toluene, xylene, cresol and chlorobenzene, methylene chloride Ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, dichlorobenzene - chlorinated hydrocarbons such as, N, N- dimethylformamide, those hexane and the like can be used. These organic solvents are not necessarily 100% pure, and may contain impurities such as isomers, unreacted materials, side reaction products, decomposition products, oxides, and moisture in addition to the main components.

  A jacket 74 is attached to the outer peripheral portion of the coating liquid tank 64. A heat medium having a constant temperature is circulated in the jacket 74, whereby the coating liquid in the coating liquid tank 64 is controlled to a constant temperature. The temperature of the coating liquid is measured by a temperature sensor (not shown), and is controlled by the control device 20 so that the measured value becomes the target temperature. The air conditioning described above is performed according to the measured temperature and the target temperature of the coating liquid. The temperature of the machine 18 (ie, the temperature of the coating chamber 14) is controlled. For example, when the temperature of the coating solution is controlled in the range of 22 ° C. to 28 ° C., the temperature of the coating chamber 14 is controlled to be 22 ° C. or higher and 28 ° C. or lower, preferably 24 ° C. or higher and 26 ° C. or lower. At that time, it is preferable to control the temperature of the coating chamber 14 to be ± 3 ° C. with respect to the target temperature of the coating solution. Further, when the measured temperature of the coating liquid is higher than the target temperature, the temperature of the coating chamber 14 is controlled to be lower than the target temperature, and when the measured temperature of the coating liquid is lower than the target temperature, the temperature of the coating chamber 14 is controlled. Is preferably controlled so as to reach the target temperature. By controlling in this way, volatilization of the solvent of a coating liquid can be suppressed more effectively, and the density | concentration change of a coating liquid can be prevented. Further, by controlling as described above, it is possible to prevent the temperature from rising and foaming from occurring in the coating liquid, and the temperature from decreasing to change the viscosity of the coating liquid. Further, the temperature of the coating solution can be controlled more accurately by controlling the temperature of the coating chamber 14. It should be noted that heat retaining means may be provided in the coating liquid supply lines 60 and 62 for feeding the coating liquid, and the liquid may be fed while being kept warm.

  Next, the cover which is a characteristic part of the present invention will be described. In the coating apparatus 10 of the present embodiment, cover members 80, 80... For covering the coating head 36 and a movable cover member 90 are provided.

  The cover member 80 is provided in the coating liquid release portion of the coating head 36 in the coating operation state shown in FIG. As shown in FIG. 4, the coating solution opening portion is a portion where the coating solution is visible when viewed from above in the coating operation state.

  FIG. 4 is a plan view showing the coating head 36 without the cover member 80 in the coating operation state. As shown in the figure, the liquid reservoirs 52 and 54 are partially covered with the web 12, but are opened upward in the outer portion of the web 12 in the width direction so that the coating liquid can be seen from above. Exposed. This part is a coating liquid release part, and there is a problem that the volatilization amount of the coating liquid is large in this part.

  Therefore, in the present embodiment, as shown in FIG. 5, cover members 80 and 80 are provided to cover the four corner portions of the coating head 36 that is the coating liquid release portion. FIG. 5 is a plan view of the coating head 36 in the coating operation state shown in FIG.

  As shown in FIGS. 2 and 5, the cover members 80 and 80 are formed by bending a plate material such as stainless steel or aluminum, and include an inclined portion 80 a, an engaging portion 80 b, and a closing portion 80 c. ing. The engaging portion 80 b of the cover member 80 is engaged with the upper side of the side plate 50 a and the side plate 50 b of the holder 50, whereby the cover member 80 is attached to the holder 50.

  The inclined portion 80a of the cover member 80 is formed in parallel with the inclined surface 42a or 44a of the barrier plate 42 or 44 as shown in FIG. 2, and is disposed with a predetermined gap with respect to the inclined surface 42a or 44a. Therefore, the coating liquid flowing on the inclined surfaces 42a and 44a flows down to the liquid reservoirs 52 and 54 through the gaps.

  The closing portion 80 c of the cover member 80 is configured to close the liquid reservoir portion 52 or 54. Thereby, it can prevent that the coating liquid of the liquid storage part 52 or 54 volatilizes and escapes outside.

  The cover member 80 is preferably fixed to the coating head 36, and may be detachably fixed to the coating head 36 by a fixing method such as screwing.

  Further, the cover member 80 is not limited to the shape described above, and is formed so as to cover at least a portion of the liquid reservoirs 52 and 54 where the coating liquid is exposed as viewed from above (coating liquid opening portion). Just do it. Therefore, for example, as shown in FIG. 6, the four corner portions of the coating head 36 may be individually covered with a cover member 81. The cover member 81 is formed with a constant width so as to cover the liquid reservoirs 52 and 54 outside the web 12. The cover member 81 is formed by bending a plate material such as stainless steel or aluminum. The cover member 81 is formed by bending the inclined surface 42a of the dam plate 42 or the inclined surface 81a of the dam plate 44, and the side plate 50a of the holder 50. An engaging portion 81b that engages with an upper portion of the liquid reservoir 52 and a closing portion 81c disposed above the liquid reservoir 52 or 54. The blocking portion 81c is disposed above the liquid reservoirs 52 and 54 by placing the inclined portion 81a on the inclined surface 42a or 44a and engaging the engaging portion 81b with the upper end of the side plate 50a. The cover member 81 preferably has its mounting position changed when the width of the web 12 is changed, or the width of the cover member 81 is changed.

  On the other hand, the movable cover member 90 is a cover that is attached to the coating head 36 in the coating preparation state shown in FIG. 3, and is removed from the coating head 36 in the coating operation state shown in FIG. The coating preparation state refers to a state in which the coating liquid is continuously supplied from the coating liquid supply lines 56 and 58 to the coating head 36 and the coating head 36 is separated from the web 12.

  As shown in FIG. 3, the movable cover member 90 is formed in an inverted V shape following the upper shape of the coating head 36, and is formed so as to cover the entire upper portion of the coating head 36. The material of the movable cover member 90 is not particularly limited, and for example, stainless steel or aluminum is used. As shown in FIG. 7, the side surface of the movable cover member 90 may be provided with a notch 90 a so as not to contact the bar 38. Further, the shape of the movable cover member 90 is not limited to that described above, and it may be formed so as to cover the portion where the coating liquid is exposed upward in the coating preparation state. Therefore, for example, as shown in FIG. 8, when the upper portions of the liquid reservoirs 52 and 54 are covered with the cover member 80, a movable cover 91 having a shape surrounding the upper portion of the bar 38 may be used. In this case, since the space between the movable cover member 91 and the coating head 36 is reduced, the volatilization amount of the coating liquid can be more reliably prevented.

  As shown by a solid line in FIG. 5, the movable cover member 90 moves to a retracted position away from the coating head 36 in the width direction of the web 12 in the coating operation state. Further, in the coating operation state, as shown by a two-dot chain line in FIG. 5, the coating head 36 moves to a coating position above the coating head 36. The movement of the movable cover member 90 may be performed automatically or manually.

  Next, the operation of the coating apparatus 10 configured as described above will be described.

  First, the coating liquid is circulated through the coating head 36 to prepare for coating. That is, the supply pumps 66 and 68 of FIG. 1 are driven to supply the application liquid in the application liquid tank 64 to the application head 36 via the application liquid supply lines 56 and 58, and the application recovered in the liquid reservoirs 52 and 54. The liquid is returned to the coating liquid tank 64 through the coating liquid circulation lines 60 and 62. As a result, the coating liquid in the coating liquid tank 64 is circulated and supplied to the coating head 36.

  In this coating preparation state, the coating head 36 is disposed at a position away from the web 12 as shown in FIG. For this reason, in the conventional case (that is, when the moving head member 80 is not provided in the coating head 36), there has been a problem that the coating liquid volatilizes from a large gap between the web 12 and the coating head 36. As a result, there has been a problem that the concentration of the coating solution changes with the lapse of time in the coating preparation state, and the dry film amount after coating deviates from a desired value.

  On the other hand, in the present embodiment, the moving cover member 90 is disposed on the upper part of the coating head 36 in a coating preparation state, and the entire upper surface of the coating head 36 is covered with the moving cover member 90. Therefore, since there is no gap for the volatile component of the coating liquid to escape on the upper surface of the coating head 36, it is possible to prevent the concentration of the coating liquid in the coating preparation state from changing. Thereby, a desired dry film amount can be accurately obtained after application.

  After the circulation of the coating liquid is stabilized in the coating preparation state, the web 12 is run. Then, the movable cover member 90 is moved to the retracted position as indicated by the solid line in FIG. Next, the coating head 36 is moved upward, and the bar 38 of the coating head 36 is pressed against the web 12 as shown in FIG. As a result, a coating operation state is established, the coating liquid is transferred to the web 12, and a layer of the coating liquid is formed on the web 12.

  In this application operation state, the cover members 80 and 80 are disposed above the liquid reservoirs 52 and 54 of the application head 36, and the upper side of the liquid reservoirs 52 and 54 is covered with the cover member 80 (FIG. 5). reference). Therefore, the gap between the web 12 and the coating head 36 is minimized, and it is possible to suppress the evaporation of the coating liquid in the liquid reservoirs 52 and 54 as much as possible. Thereby, even if it is a case where application | coating operation is continued for a long time, volatilization of a coating liquid can be suppressed and the time-dependent change of the density | concentration of a coating liquid can be suppressed. Therefore, according to this embodiment, the amount of dry film after application can be stabilized, and high quality application can always be performed.

  In addition, according to the present embodiment, the temperature of the coating chamber 14 is controlled according to the temperature of the coating solution, so that the volatilization of the coating solution can be suppressed, and the change with time of the concentration of the coating solution is further increased. It can be effectively suppressed.

  In the above-described embodiment, the temperature of the entire coating chamber 14 is controlled. However, the present invention is not limited to this, and the temperature near the coating head 36 may be controlled.

  Moreover, although embodiment mentioned above showed the coating device using the bar coating method, a coating method is not limited to this, If it is the coating method which has an open part in which a coating liquid volatilizes in a coating head, it is above-mentioned. Effect. For example, particularly great effects can be obtained in dip coating, roller coating, gravure coating, and blade coating.

  Furthermore, although the embodiment described above uses an organic solvent-based coating solution, the present invention is not limited to this, and the effect of the present invention can be obtained if the coating solution has a component that volatilizes at the atmospheric temperature of the coating section. It is done.

  Test 1: The coating preparation state was continued for 5 hours, and the coating solution at that time was sampled to measure the concentration fluctuation. In addition, coating was performed using the sampled coating solution, and the variation in the dry film amount was examined. The test was performed when the moving cover member 90 was provided (Example 1) and when the moving cover member 90 was not provided (Comparative Example 1).

The coating conditions were as follows: aluminum web thickness: 0.3 mm, web moving speed: 50 m / min, coating method: bar coating, coating amount: 20 cc / m ² , bar diameter: 10 mm, bar rotation speed: −50 rpm ( Rotating in the direction opposite to the web traveling direction), coating liquid viscosity: 1.5 mPa · s, liquid feeding amount (coating liquid supply amount): 1.5 L / min, liquid feeding width: 1000 mm, coating liquid temperature: 25 to 27 C., temperature of coating chamber: around 23.degree.

  Test 2: The coating operation state was continued for 5 hours, and the concentration variation of the coating solution and the variation of the dry film amount were measured. The test was performed when the cover member 80 was provided (Example 2) and when the cover member 80 was not provided (Comparative Example 2).

  The results of tests 1 and 2 are shown in Table 1.

表１から分かるように、移動カバー部材９０のない比較例１では、塗布準備状態を継続することによって、塗布液の濃度が４〜５％と大きく変動し、塗布量乾膜量も４〜５％と大きく変動した。これに対して、移動カバー部材９０を設けた実施例１では、塗布準備状態を継続しても、塗布液の濃度変動を０．４％未満に抑えることができ、塗布量乾膜量も０．４％未満に抑えることができた。

As can be seen from Table 1, in Comparative Example 1 without the moving cover member 90, by continuing the coating preparation state, the concentration of the coating solution fluctuates greatly as 4 to 5%, and the coating amount and the dry film amount are also 4 to 5 % Greatly fluctuated. On the other hand, in Example 1 provided with the movable cover member 90, even if the coating preparation state is continued, the concentration fluctuation of the coating liquid can be suppressed to less than 0.4%, and the coating amount and the dry film amount are also zero. It was possible to suppress it to less than 4%.

  Moreover, in the comparative example 2 without the cover member 80, by continuing the application | coating operation state, the density | concentration of a coating liquid fluctuated greatly with 2-3%, and the coating amount dry film amount also fluctuated greatly with 2-3%. On the other hand, in Example 2 provided with the cover member 80, even if the coating preparation state is continued, the concentration fluctuation of the coating liquid can be suppressed to less than 0.2%, and the coating amount and the dry film amount are also set to be 0.1. It was possible to suppress it to less than 2%.

The schematic diagram which shows the main structures of the coating device which concerns on this invention Sectional view showing the application head in the application operation state Sectional view showing the application head in the application preparation state The top view which shows the application head before attaching a cover member Top view showing the coating head in the coating operation state with the cover member attached The top view which shows the application head which attached the cover member of a shape different from FIG. The side view which shows the movable cover member of FIG. Sectional drawing which shows the coating head which attached the movable cover member of a shape different from FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Application | coating apparatus, 12 ... Web, 14 ... Application | coating chamber, 18 ... Air conditioner, 20 ... Control apparatus, 24 ... Application | coating part, 36 ... Application | coating head, 38 ... Bar, 52, 54 ... Liquid storage part, 64 ... Application liquid Tank, 80 ... cover member, 90 ... moving cover member

Claims (6)

In a coating method in which a coating liquid is applied to a support by a coating head, and a part of the coating liquid is collected and circulated to the coating head.
A coating method, wherein coating is performed while a coating member opening portion where the coating solution is opened upward in a coating head in a coating operation state is covered with a cover member. In a coating method in which a coating liquid is applied to a support by a coating head, and a part of the coating liquid is collected and circulated to the coating head.
In a preparation state where the coating head is retracted from the support, a movable cover member is disposed on the top surface of the coating head to cover the top surface,
A coating method comprising performing a coating operation by moving the movable cover member away from the upper surface of the head and bringing the coating head close to the support.   The coating method according to claim 1, wherein the coating solution is an organic solvent-based coating solution.   The coating method according to claim 1, wherein the temperature of the atmosphere in which the coating is performed is controlled according to the temperature of the coating solution. An application head having an application liquid release portion that applies the application liquid to the support and the application liquid is opened upward in an application operation state;
A circulation supply means for collecting a part of the coating liquid of the coating head and circulatingly feeding the coating head to the coating head;
A cover member that covers the coating liquid opening of the coating head;
A coating apparatus comprising: An application head for applying the coating liquid to the support and separating the support from the support in the preparation state of application;
A circulation supply means for collecting a part of the coating liquid applied by the coating head and circulatingly supplying the coating liquid to the coating head;
A moving cover member covering the upper surface of the coating head in the coating preparation state;
Moving means for moving the moving cover member between a covering position covering the top surface of the coating head and a spaced position spaced from the top surface of the coating head;
A coating apparatus comprising:

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