JP2005211762A - Coater, coating method and manufacturing method of resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coater that is capable of properly preventing the generation of dispersion of the film thickness due to the rolling deflection of a reverse roll coater and that is capable of properly carrying out the resin coating of a predetermined thickness with excellent accuracy in submicron order and without the dispersion of thickness, and to provide a coating method. <P>SOLUTION: The coater is provided with a transferring roll, a supply means of a coating liquid to supply the coating liquid onto the transferring roll and a weighing means arranged by spacing the transferring roll with a gap. It is further provided with a measuring means to measure at least the deflection of the transferring roll and a controlling means to control the variation of the gap by controlling the setting position at least either one of the weighing means or the transferring means in accordance with the measured value by the measuring means of the transferring roll deflection. Also, if the weighing means is a weighing roll, the control is carried out by measuring at least either one of the deflection of the weighing means or the transferring roll. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coating apparatus and a coating method for coating a coating solution for imparting various functions to the surface of a sheet-like substrate made of a film, paper, cloth, metal or the like called a web. Relates to a coating apparatus and a coating method that enable coating with little variation in the coating film thickness of the coating liquid in the length direction of the sheet-like substrate.

  Conventionally, a coating technique for applying a coating solution that can give various functions to the surface of a sheet-like substrate made of film, paper, cloth, metal, etc. is known, and various coaters are used in each field. It is coming.

  Among them, for example, a reverse roll coater is suitable for application of a coating solution having a relatively high viscosity such as a resin.

  In recent years, in response to the demand for higher quality coating products, there has been an increasing demand for extremely uniform coating thickness. For example, in resin coating, it is required to achieve submicron order accuracy. It is becoming.

  On the other hand, a method for automatically controlling the thickness of a coating film applied by a roll coater so as to be a predetermined value has been proposed. A method of measuring with a thickness meter and controlling the coating portion with a controller based on the obtained film thickness has been proposed (Patent Document 1).

  Further, in the lip coater type coating device, the fluid pressure value of the coating fluid inside the coating fluid reservoir chamber is detected, the deviation between the set fluid pressure value and the current fluid pressure value is calculated, and the doctor edge portion and There has been a proposal to adjust the gap amount with the backup roll (Patent Document 2).

  In addition, in the field of resin-carrying release sheets, proposals have been made regarding resin coating film forming technology.For example, the basis weight of a resin formed on a resin-carrying release sheet is measured, and based on the basis weight measurement value, A method of controlling at least one of a speed ratio between a coating roll and an applicator roll and a speed ratio between an applicator roll and a metering roll constituting a coating apparatus has been proposed (Patent Document 3).

  However, in these conventional technologies, when the initial setting of the coating apparatus is poor or the coating conditions are changed, the coating thickness is adjusted to a predetermined value, or the coating surrounding environment changes for a long time. It is effective when adjusting to a predetermined value when the coating thickness changes in a short time or cycle, but when the coating thickness changes or occurs in a relatively short cycle such as a roll oscillation cycle It could be said that the real-time response as expected is still insufficient.

  It is understood that the background of such prior art has not been required to control the thickness in a strict minute order.

  As a result of repeated studies on coating by the reverse roll method, the present inventors have found that the coating film formed by the reverse roll coater has variations in the thickness in the longitudinal direction and the width direction, and the thickness control thereof. It was found that the accuracy of the machine is almost determined by the machine accuracy of the coater equipment. Here, specifically, for example, the cause of variation in the longitudinal direction is that the influence of fluctuations in the clearance (which corresponds to a “gap” described later and determines the thickness of the coating film) due to roll vibration is extremely large. Obtained knowledge.

  Here, the roll run-out means that in roll manufacturing processing (the roll outer periphery is slightly deviated from a perfect circle) and / or (even if the roll outer periphery is a perfect circle, The roll center axis is slightly deviated)), etc., during the actual coating process using the coater, the roller surface is rotated along with the rotation of the rotating component roll of the coater device. Rather than maintaining the exact same position in three dimensions, it means a phenomenon that “was” subtly even within a submicron to micron order range or a level below that range. This “swaying” phenomenon is usually caused by a technical problem related to the accuracy of roll manufacture, and generally appears as a steady vibration synchronized with the roll rotation cycle during coating.

  As described above, such roll runout is a technical problem related to roll manufacturing accuracy. However, with current roll processing accuracy, it is impossible to eliminate occurrence of runout within a range of 2 to 3 μm. It is a normal technical limit, and further progress, eliminating the occurrence of fluctuations in the submicron order and suppressing the above-mentioned clearance (gap) fluctuation within the submicron order, is a countermeasure to increase the accuracy of roll production. Then, it was the actual situation that could not be realized yet.

On the other hand, in order to prevent the occurrence of coating thickness variation due to roll runout, the fluctuations in the clearance (gap) between the rolls and the like are directly measured, and the clearance is controlled in accordance with the fluctuations. Although it is conceivable to achieve a uniform coating thickness, it is also generally difficult to accurately measure a clearance of several tens of μm, such as between rotating rollers, in real time. Realization is difficult.
Japanese Utility Model Publication No. 6-24771 Japanese Patent Laid-Open No. 7-313917 Japanese Patent Laid-Open No. 3-123670

  In view of the above-described points, the object of the present invention is to generate variations in coating film thickness due to roll runout of the constituent rolls of the coater when a resin is applied to the surface of a sheet-like substrate using a reverse roll coater. To provide a coating apparatus and a coating method that can realize a good resin coating with a predetermined thickness without any variation in thickness with good accuracy on the order of submicrons. It is in providing the manufacturing method of the resin sheet using this apparatus and method.

The coating apparatus of the present invention that achieves the above-described object has the following configuration (1) or (2).
(1) A transfer roll, a coating liquid supply means for supplying a coating liquid onto the transfer roll, and a metering means disposed with a gap from the transfer roll, and the transfer roll is provided by the coating liquid supply means. In a coating apparatus that measures the coating liquid supplied above by passing through the gap and coats the measured coating liquid on the surface of the web with the transfer roll, the runout measurement measures at least the runout of the transfer roll. And a control unit for controlling fluctuation of the gap by controlling the installation position of at least one of the metering unit or the transfer roll based on the value measured by the transfer roll deflection measuring unit. An applicator characterized by comprising:
(2) a transfer roll, a coating liquid supply means for supplying a coating liquid onto the transfer roll, and a measuring roll as a measuring means arranged with a gap from the transfer roll, and the coating liquid supply means In a coating apparatus that measures the coating liquid supplied on the transfer roll by passing through the gap, and applies the measured coating liquid onto the surface of the web by the transfer roll, at least of the transfer roll and the metering roll A roll run-out measuring unit for measuring run-out of one of the rolls, and based on a value measured by the roll run-out measuring unit, controlling an installation position of at least one of the measuring roll or the transfer roll, A coating apparatus comprising control means for suppressing gap fluctuation.

More specifically, the coating apparatus of the present invention preferably has the following configurations (3) to (5).
(3) The coating apparatus according to (1) or (2), wherein the shake measurement means is a detection means for detecting a roll shake value and a roll rotation phase measured in advance.
(4) The coating device according to (1), (2) or (3), wherein the length of the measuring means and the transfer roll is not less than 1000 mm and not more than 3000 mm.
(5) The coating apparatus according to (1), (2), (3) or (4), wherein the gap is 50 μm or less.

The coating method of the present invention that achieves the above-described object has the following configuration (6) or (7).
(6) In a coating method in which the coating liquid supplied onto the transfer roll by the coating liquid supply means is measured by passing through the gap between the transfer roll and the measuring means, and applied from the transfer roll to the surface of the web. A coating method, wherein the variation of the gap is suppressed by controlling the installation position of at least one of the metering means or the transfer roll in response to the shake of the transfer roll.
(7) Coating by which the coating liquid supplied onto the transfer roll by the coating liquid supply means is measured by passing through the gap between the transfer roll and the measuring roll as the measuring means, and applied to the surface of the web from the transfer roll In the method, at least one of the transfer roll and the transfer roll is controlled to control the installation position of at least one of the transfer roll and the transfer roll so as to suppress fluctuations in the gap. A coating method characterized by comprising:

In the coating method of the present invention, more specifically, the following (8) to (10) are preferable.
(8) The coating method according to (6) or (7) above, wherein the length of the measuring means and the transfer roll is 1000 mm or more and 3000 mm or less.
(9) The coating method according to (6), (7) or (8) above, wherein the gap is 50 μm or less.
(10) The coating method as described in (6), (7), (8) or (9) above, wherein the viscosity of the coating solution is 1 Pa · sec or more and 1000 Pa · sec or less.

The manufacturing method of the resin sheet of the present invention that achieves the object of the present invention described above has the following configurations (11) to (12).
(11) A method for producing a resin sheet, wherein a resin is applied to a web using the coating apparatus according to any one of claims 1 to 5.
(12) A method for producing a resin sheet, characterized in that a resin sheet in which a resin is applied to a web is produced using any one of the application methods according to claims 6 to 10.

  According to the present invention, when a resin is applied to the surface of a sheet-like substrate using a reverse roll coater, a coater device that generates roll runout based on the production accuracy of the constituent rolls is used. In real time, it is possible to satisfactorily prevent the occurrence of coating thickness variation due to the roll runout, and to perform a resin coating with a predetermined thickness with good submicron accuracy and no thickness variation. A coating apparatus and a coating method for realizing the above are provided.

  In particular, the apparatus and method of claims 1 and 6 are particularly effective in a roll coater that is not formed in a roll as a measuring means, for example, a gap coater that forms a gap with a transfer roll using a doctor knife or the like.

  In particular, the apparatus and method of claims 2 and 7 are particularly effective in a reverse roll coater that uses a measuring roll as a measuring means and forms a gap with the transfer roll.

  In particular, the apparatus according to claim 3 uses a roll runout value measured in advance during non-coating, so it is only necessary to detect the rotational phase of the roll during coating, no complicated control is required, and the equipment cost is also high. An inexpensive device can be realized.

  In particular, the coating apparatus and the coating method according to claims 4 and 8 have a great effect in the case where a production accuracy defect that becomes noticeable when using a long measuring means and a transfer roll is used. A coating apparatus and a coating method suitable for manufacturing the above can be realized.

  In particular, the coating apparatus and the coating method according to claims 5 and 9 are particularly effective in coating thin films in which roll runout greatly affects fluctuations in the gap between the measuring means and the transfer roll.

  In particular, the coating method according to claim 10 is highly effective in coating with a high-viscosity coating solution in which the variation in the gap greatly affects the variation in coating film thickness.

  In particular, the method for producing a resin sheet according to claims 11 and 12 is highly effective in producing a resin-carrying release sheet formed by applying a resin with a reverse roll coater to the surface of a paper coated with a release agent. Is.

  Hereinafter, the coating apparatus and the coating method of the present invention will be described in more detail with reference to the drawings.

  The first coating apparatus of the present invention comprises a transfer roll, a coating liquid supply means for supplying a coating liquid onto the transfer roll, and a metering means arranged with a gap from the transfer roll. The coating liquid supplied onto the transfer roll by the liquid supply means is measured by passing through the gap (clearance), and the measured coating liquid is applied to the surface of the base sheet (web) by the transfer roll. A coating apparatus for coating, in particular, having at least a shake measuring means for measuring a shake of the transfer roll, and based on a value measured by the transfer roll shake measuring means, the measuring means or the transfer roll It has a control means for controlling at least one of the installation positions to suppress fluctuations in the gap.

  Alternatively, in the first coating apparatus of the present invention described above, a case where a doctor knife or a cylindrical blade having an edge on an outer peripheral surface that does not rotate is used as the weighing unit is realized. When a rotating measuring roll is used instead of a doctor knife or the like, it can be realized as the following second coating device of the present invention.

  That is, FIG. 1 shows a model of the second coating apparatus according to the present invention. However, unlike the configuration of the first apparatus, the measurement of runout of the rotating measuring roll rotating during the coating process is performed. In addition, the installation position of the measuring roll may be controlled, and specifically, roll run measuring means for measuring the run out of at least one of the transfer roll and the measuring roll is provided. And control means for controlling fluctuation of the gap by controlling the installation position of at least one of the metering roll or the transfer roll based on the value measured by the roll deflection measuring means. It is characterized by.

  In FIG. 1, the coating liquid 5 supplied from the coating liquid supply means 4 onto the transfer roll 2 passes through the gap between the transfer roll 2 and the measuring roll 3 and is measured by being scraped off by the measuring roll 3. 5a. The measured coating film 5a is transported to the contact position with the web 1 by the transfer roll 2 and applied to the web 1 by being transferred to the predetermined coating film 5b.

  Examples of the web 1 that is a base sheet material include paper, a resin film, a nonwoven fabric, a knitted fabric, and a metal strip. Examples of the coating liquid supply unit 4 include a unit that forms a coating liquid reservoir above the transfer roll and the metering roll, but is not limited thereto.

  As described above, the present inventors have made various studies regarding the coating by the reverse roll method, and as a result, the coating film 5b has a thickness variation in the longitudinal direction, and the cause of the variation is the gap due to the roll shake. The knowledge that the influence of the fluctuation is extremely large was obtained.

  That is, when the transfer roll and the metering roll have runout, periodic fluctuations accompanying the roll runout occur in the gap between the transfer roll and the metering roll. This variation causes variation in measurement when the coating liquid passes through the gap, and causes variation in thickness in the coating film 5a. The thickness variation formed on the coating film 5a is carried by the transfer roll and transferred to the web as it is, and as a result, the coating film 5b also has a thickness variation. The inventors pay attention to this mechanism, measure the roll shake by the roll shake measuring means 6, and based on the measured value, the roll installation position so as to suppress the gap variation by the roll position control means (not shown). It was found that the variation of the coating film 5b can be reduced by controlling the.

  In other words, the position of the roll is moved so that the gap becomes larger at the position where the gap becomes smaller due to the roll shake, and the position of the roll is moved so that the gap becomes smaller at the position where the gap becomes larger. As a result, the variation of the coating film 5b can be reduced.

  As the roll run-out measuring means, for example, the roll run-out may be measured online using a displacement sensor during the coating process, or the roll run-out value previously measured during the non-coating process ( It is also possible to employ a configuration in which the roll phase of the roll is detected during the coating process using a roll deflection value corresponding to the roll phase).

  The displacement sensor may generally be any sensor that detects the distance from the sensor, and any sensor may be used, but more preferably a non-contact type displacement sensor such as a laser type, eddy current type, or ultrasonic type. Is good. Moreover, you may use what used also as the detection apparatus which can detect a roll rotational phase with roll shake, or what can detect a rotational phase in response to roll shake. In such a case, the phase of the roll position adjustment amount calculated from the roll deflection value and the rotation phase of the roll can be synchronized more accurately.

  In addition, the roll position control means is a control unit that calculates the adjustment amount of the roll position based on a signal from the roll shake measuring means, and controls the roll position by changing the roll position via hydraulic pressure or a motor based on the calculation result. It consists of a position control device.

  The roll deflection measurement method and the roll position control method are not necessarily limited to one method, and as described in detail in Examples 1 to 3 described later, continuously during the coating process or Periodically (periodically or irregularly at intervals), a method of measuring roll runout, etc. can be employed. Also, during the coating process, the rotation phase of the roll is detected continuously or periodically so that it is synchronized with the phase of the roll position adjustment amount calculated from the roll runout value measured in advance during non-coating. The roll position may be controlled. In such a case, it is only necessary to detect the rotation phase of the roll at the time of coating, and complicated control is not required, and the equipment cost can be reduced.

  In addition to measuring the roll runout of the metering roll (or transfer roll) and controlling not only the position of the metering roll (or transfer roll), the position of the metering roll (or transfer roll) is kept as it is, The position of the roll (or metering roll) may be controlled, or the installation position of both rolls may be controlled.

  In general, control of the installation position of the weighing means (which is a concept including the position itself and the inclination of the knife in the case of a doctor knife) and the installation position of the measurement roll, which are the primary roles of controlling the amount of coating liquid It is thought that it is often good to do. This is because it is not necessary to adjust the positional relationship with the base material sheet that is the material to be coated.

  Moreover, in this invention, it is preferable that the length of a measurement means (or measurement roll) and a transfer roll is 1000 mm or more and 3000 mm or less. In particular, when such a long roll is used, there is generally a problem that roll run-out increases due to the technical limit of roll processing accuracy and coating thickness variation becomes worse. According to the coating apparatus and the coating method of the present invention, it is possible to eliminate the coating thickness variation regardless of the roll runout, and in such a case, the effect is great. Moreover, the longer the roll, the lower the production cost of the product, which is useful.

  In addition, the coating apparatus and the coating method of the present invention are preferably used when applied to a coating having a gap of 50 μm or less because the improvement effect is more noticeable. This is because the fluctuation of the gap due to the roll shake is constant regardless of the size of the gap, and the ratio of the fluctuation to the gap increases as the gap becomes narrower. That is, the thinner the coating thickness, the worse the thickness variation rate. Such coating is generally employed in, for example, a manufacturing process of a color filter for a liquid crystal display or the like, and is particularly a high value-added field in which high accuracy is required. Realizing the coating is useful because it immediately improves the yield of the product and at the same time significantly improves the product quality.

  In the coating apparatus and coating method of the present invention, any coating solution may be used as long as it is used in general coating, but the viscosity of the coating solution is 1 Pa · sec or more and 1000 Pa. -It can be used particularly effectively when coating is performed using a material having a sec or less. According to the knowledge of the present inventors, in the case of such a viscosity, the leveling property of the coating liquid is poor, and the coating film is difficult to be smoothed after coating. This is because it often directly affects the coating thickness variation.

Hereinafter, the coating apparatus and the coating method of the present invention will be specifically described based on examples.
Example 1
Using a reverse roll coater whose outline model is shown in FIG. 1, a sheet-like substrate (web) having a width of 1000 mm and a thickness of 100 μm made of paper having a surface coated with a silicon release agent is run at a speed of 10 m. It was run at / min.

The speeds of the metering roll and the transfer roll were 7 m / min and 10 m / min, respectively. As the coating solution, an epoxy resin having an amine as a precursor and having a viscosity of 100 Pa · s is used, and the gap between the measuring roll and the transfer roll is set so that the coating amount is 20 g / m ^{2 on} the surface of the sheet-like substrate ( Application was performed with initial adjustment of (clearance).

  When performing this coating, an eddy current type displacement sensor is used as a roll deflection measuring means, as shown in FIG. 1, on the straight line connecting the center point of the measuring roll and the transfer roll, and above the measuring roll. And two were installed in the axial direction (width direction) of the roll.

  The roll position was controlled on the metering roll. Specifically, first, the distance to the measuring roll surface is measured with a displacement sensor for five roll rotation periods (m = 5 in FIG. 2), and the five periods obtained as shown in FIG. The shake distribution over the period of time (time T in FIG. 2) was averaged for one period, and an average shake distribution for one period as shown in FIG. 3 was obtained.

Next, the time for one cycle (time t in FIG. 3; T = m × t) is divided into 20 equal parts (this equal fraction is n, n = 20 in FIG. 3), and t ₁ , t ₂ , _{t 3, t 4, t 5} , and ...... t _20, further the displacement X ₁ in each of these _{time, X 2, X 3, X} 4, roll displacement at ............ X ₂₀ (time t _{i Is} expressed as X _i ).

Then, the roll position adjustment amount (X _mod ) _i at time t _i was obtained by the following equation.
(X _mod ) _i = X _i −X _mean (i = 1, 2,..., N (n = 20 in the first embodiment))

  Based on the roll position adjustment amount obtained in this way, when the adjustment amount is positive, the position of the metering roll is moved in the minus direction, that is, in the upper right direction in FIG. 1, and when negative, the brass direction, that is, in FIG. Moved to the lower left direction.

  The above procedure was continuously executed during coating to control the position of the metering roll.

The L-th and subsequent L-th roll position control is performed by determining the roll position adjustment amount (X _mod ) _{i, L} by the following equation.
(X _mod ) _{i, L} = (X _mod ) _{i, (L-1)} + (X) _{i, L} − X _mean (L = 2, 3, ...)

  In addition, the coating amount (coating film thickness) is measured by cutting out 50 samples every 10 cm square in the running direction (longitudinal direction) of the coated substrate sheet, and then the surface of the sample substrate sheet The resin was scraped off and the resin weight was measured with an electronic balance.

  In addition, the variation in the coating amount is expressed in the range R (the difference between the maximum value and the minimum value) of the obtained measurement values.

  Under the above conditions, coating was performed according to the apparatus and method of the present invention.

  As a result of the coating, variation distribution of the coating amount was examined and evaluated.

As a result, the R value (difference between the maximum value and the minimum value) is R = 0.8 g / m ² , and the distribution of the coating amount in the length direction is as shown in FIG. It was possible to evaluate that the coating exhibiting a satisfactory coating thickness was successfully realized.
Example 2
In the method of Example 1 described above, the measurement roll deflection measurement and the roll position adjustment amount change were not performed continuously during the coating process, but at preset intervals.

As a result, although description of data etc. was abbreviate | omitted, the favorable coating result was able to be obtained substantially the same as Example 1.
Example 3
Using the reverse roll coater used in Example 1, however, the roll was rotated by rotating it during non-coating (idle operation), and the runout distribution of the metering roll was measured using an eddy current displacement sensor. The roll position adjustment amount was calculated. Specifically, it was performed as follows.

  That is, the run-out distribution of the metering roll is measured in advance at the time of non-application, and the roll position adjustment amount is obtained in the same procedure as the control method described in the first embodiment. Also, as shown in FIG. 4, a marker 7 for calculating the rotational phase of the roll is attached to the position of the maximum value or minimum value of the roll shake distribution (in this third embodiment, the position of the maximum value of the distribution is set). Marker was installed).

  At the time of application, the rotational phase detection sensor 8 detects the rotational phase of the metering roll, and the position of the roll is synchronized with the phase of the pre-calculated metering roll position adjustment amount. Similarly, application was performed while controlling by moving the metering roll.

  As a result of the coating, variation distribution of the coating amount was examined and evaluated.

As a result, the R value (difference between the maximum value and the minimum value) is R = 0.9 g / m ² , and the distribution of the coating amount in the length direction is a result as shown in FIG. Although inferior to Example 1, it could be evaluated that the coating exhibiting a uniform coating thickness was successfully realized.
Comparative Example 1
Using the reverse roll coater described in Example 1, however, the displacement sensor was removed, and coating was performed under the same conditions as in Example 1 except that the roll position was not controlled after the initial setting. .

As a result, the R value (difference between the maximum value and the minimum value) is R = 5.1 g / m ² , and the distribution of the coating amount in the length direction is as shown in FIG. It was an unfavorable thing that it was recognized that a coating having a sufficient coating thickness could not be realized.

FIG. 1 is a schematic side model diagram schematically showing the main part of the coating apparatus according to the second aspect of the present invention, and shows the mode adopted in the first embodiment. FIG. 2 is an example of a diagram that schematically illustrates the shake distribution when the occurrence of roll shake is measured using a displacement sensor. FIG. 3 is an example of a diagram schematically showing the average runout distribution of the roll for one rotation of the roll as a part of the method for measuring roll runout in the apparatus and method of the present invention and linked to control of the roll position. is there. FIG. 4 is a schematic side view model diagrammatically showing the main part of the coating apparatus according to the second aspect of the present invention as in FIG. 1, and particularly shows an aspect adopted in the third embodiment. FIG. 5 is a diagram showing the results of examining the state of occurrence (variation) in the coating film thickness obtained by the coating shown in Example 1 in the base sheet length direction. FIG. 6 is a diagram showing the results of examining the occurrence state (variation) of the coating thickness obtained by the coating shown in Example 3 in the base sheet length direction. FIG. 7 is a diagram showing the results of examining the state of occurrence (variation) in the coating thickness obtained by the coating shown in Comparative Example 1 in the length direction of the base sheet.

Explanation of symbols

1: Web 2: Transfer roll 3: Measuring roll 4: Coating liquid supply means 5: Coating liquid 5a: Weighed coating film 5b: Coating film 6: Roll shake measuring means 7: Marker 8: Rotation phase detection sensor

Claims (12)

  A transfer roll, a coating liquid supply means for supplying a coating liquid onto the transfer roll, and a metering means arranged with a gap from the transfer roll, are supplied onto the transfer roll by the coating liquid supply means. The coating apparatus for measuring the measured coating liquid by passing through the gap and coating the measured coating liquid on the surface of the web by the transfer roll has at least a shake measuring means for measuring the shake of the transfer roll. And control means for controlling fluctuations in the gap by controlling the installation position of at least one of the metering means or the transfer rolls based on the value measured by the transfer roll shake measuring means. An applicator characterized by that.   A transfer roll, a coating liquid supply means for supplying a coating liquid onto the transfer roll, and a metering roll as a measuring means disposed at a gap from the transfer roll, and the transfer liquid is supplied by the coating liquid supply means. In a coating apparatus that measures the coating liquid supplied on the surface by passing through the gap and coats the measured coating liquid on the surface of the web by the transfer roll, at least one of the transfer roll and the metering roll And a fluctuation of the gap by controlling the installation position of at least one of the metering roll or the transfer roll based on the value measured by the roll deflection measuring means. A coating apparatus comprising a control means for suppressing the above.   The coating apparatus according to claim 1, wherein the shake measuring unit is a detecting unit that detects a roll shake value and a roll rotation phase that are measured in advance.   The coating device according to claim 1, 2, or 3, wherein the length of the measuring means and the transfer roll is not less than 1000 mm and not more than 3000 mm.   The coating apparatus according to claim 1, 2, 3, or 4, wherein the gap is 50 µm or less.   In the coating method in which the coating liquid supplied onto the transfer roll by the coating liquid supply means is measured by passing through the gap between the transfer roll and the metering means and applied to the surface of the web from the transfer roll. The coating method is characterized in that, in response to the run-out, the variation of the gap is suppressed by controlling the installation position of at least one of the metering means or the transfer roll.   In the coating method in which the coating liquid supplied onto the transfer roll by the coating liquid supply means is measured by passing through the gap between the transfer roll and the measuring roll as the measuring means, and applied to the surface of the web from the transfer roll. Corresponding to at least one roll deflection of the transfer roll and the metering roll, at least one installation position of the metering roll and the transfer roll is controlled to suppress fluctuations in the gap. The coating method characterized by the above-mentioned.   The coating method according to claim 6 or 7, wherein the length of the measuring means and the transfer roll is 1000 mm or more and 3000 mm or less.   The coating method according to claim 6, wherein the gap is 50 μm or less.   The coating method according to claim 6, wherein the viscosity of the coating solution is 1 Pa · sec or more and 1000 Pa · sec or less.   A method for producing a resin sheet, comprising applying a resin to a sheet-like substrate using the coating apparatus according to claim 1.   A method for producing a resin sheet, wherein a resin sheet in which a resin is applied to a sheet-like substrate is produced using the coating method according to claim 6.

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