JPH01258760A - Roll coater - Google Patents

Abstract

PURPOSE:To uniformly coat a high-viscosity coating liquid at a required film thickness on the surface of a base material by inscribing grooves of a specific groove width and peak width circumferentially to the peripheral face of a coating roll and moving both the coating roll and a doctor bar upward and downward. CONSTITUTION:The high-viscosity coating liquid having >=1,000cp viscosity is coated with the coating roll 1C on the surface of the horizontally carried base plate P. The grooves 21 of <=80mu peak width are inscribed at >=300mu pitch circumferentially on the peripheral face of said coating roll 1C and the roll 1C is disposed freely attachably and detachably in the vertical direction with respect to the carrying path of the plate P. Further, the doctor bar 1D is disposed freely attachably and detachably to the roll 1C. This doctor bar 1D is so supported as to move upward and downward together with the roll 1C. As a result, the high-viscosity coating liquid is evenly and uniformly coated at the required film thickness on the surface of the base plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll coater for uniformly applying a highly viscous coating liquid to the surface of a thin plate-like substrate.

[Conventional technology]

Conventionally, as an apparatus for applying a required coating liquid to the surface of a substrate such as a printed wiring board using a roll coater, for example, Japanese Patent Application Laid-Open No. 60-230658 (title of invention [Photosensitive liquid coating apparatus for printed wiring board]) is known. ), grooves with a width W of 0.1 to 3ffn, preferably 0.51, are formed on the circumferential surface of the roll 2C (see FIG. 11) on the side on which the photosensitive liquid is applied to the substrate. The interval F=O, 1 to 5 (1), preferably 0.5rrIa (see Fig. 12), the center of the roll is symmetrically carved spirally, and the groove is formed on the circumferential surface of the roll. A photosensitive liquid coating apparatus is known that applies a photosensitive liquid layer onto the surface of a substrate.

[Problem to be solved by the invention]

The coating liquid used in the coating apparatus described in JP-A No. 60-230658 is an etching-resistant photosensitive liquid (etching photoresist), and has a viscosity of several tens to several hundred ap culm. However, for example, the viscosity of a solder-resistant photosensitive liquid (solder photoresist) is approximately 20 r 000 c p or more at a liquid temperature of 20°C, so some conventional roll coaters do not allow the photosensitive liquid to coat the substrate surface Vi. Not only is it not possible to apply it evenly, but
There were some areas that could not be completely coated.

In addition, Jt'J Iflj insulation is applied to liquid crystal glass substrates, etc.
The polyimide resin used as a resin has a viscosity of several thousand cp at a liquid temperature of 28° C., but it is still difficult to apply it uniformly with a conventional roll coater.

For example, as shown in Fig. 12, when a polyimide resin with a viscosity of 1000 cp or more is applied to the substrate surface using a coating roll 2C in which grooves of %W = 0.5 nn are carved at an interval F = 0.5 na. , there are areas on the substrate surface where it cannot be completely coated, resulting in uneven coating.

Moreover, FIG. 13 shows a part of the conventional roll coater 2 shown in FIG. 11 in an enlarged manner.

As the viscosity of the coating liquid 4 increases, as shown in FIG.
The coating liquid 4 is applied to the coating roll 2 below the contact position between the coating roll 2C and the doctor roll 2D.
It adheres not only to C but also to the surface of doctor roll 2D,
The required amount of the coating liquid 41 did not adhere to the surface of the coating roll 2C, and it was not possible to form the coating liquid 44 with the required thickness on the surface of the substrate p.

Furthermore, the coating liquid 41 attached to the coating roll 2C
There is a problem in that thread-like coating liquid 43 is generated between the coating liquid 42 and the coating liquid 42 attached to the doctor roll 2D, and this causes unevenness in the film thickness of the coating liquid 44 applied to the surface of the substrate P. Ta.

Furthermore, after the coating roll 2C and the substrate p come into contact with each other, as shown in FIG. There was a problem in that the coating liquid 44 could not be uniformly coated 41 on the surface of the substrate p.

Further, the thread-like coating liquid 43' is applied to the coating roll 2.
As the substrate P rotates and the substrate P advances, it becomes thinner and thinner, and when it is eventually cut, there is a problem in that air is sucked in and minute bubbles are generated on the surface of the substrate P.

Furthermore, when a highly viscous coating liquid is applied to the substrate p, as shown in FIG. , and other portions 46 are thicker. The difference in film thickness on the surface of the coating roll 2C does not disappear just by rotating the coating roll 2C once, and in order to eliminate the difference in film thickness that has already occurred, it is necessary to rotate the coating roll 2C several times. It was necessary to do so. Therefore, when the substrate p is continuously passed between the coating roll 2C and the backup roll IB,
Or the substrate p is longer than the circumferential length of the coating roll 2C.
When the coating liquid 44 is passed between them, there is also a problem that the film thickness of the coating liquid 44 becomes thinner in the portion where the coating liquid 44 is transferred onto the surface of the substrate P beyond the circumferential length of the coating roll 2G.

All of the problems listed above arise when applying a coating liquid to the surface of a transported substrate using a roll coater.
This is caused by the high viscosity of the coating liquid. Therefore, this invention.

Provides a roll coater that is suitable for applying high viscosity coating liquids such as photoresist for solder or polyimide resin to the substrate surface without the various problems mentioned above. The technical challenge is to do so.

[Means to solve the problem]

In order to achieve the above object, a roll coater according to the present invention is a roll coater that applies a high viscosity coating liquid with a viscosity of 1000 cP or more to the surface of a horizontally conveyed substrate via a coating roll, Grooves with a peak width of 80 μm or less are formed at a pitch of 300 in the circumferential direction of the circumferential surface.
The coating roll is disposed so as to be movable toward and away from the substrate transport path in the vertical direction, and a doctor bar is disposed on the coating roll so as to be movable toward and away from the substrate conveyance path. It is configured to be supported so as to move up and down together with the coating roll.

Further, a means for heating at least one of the coating roll or the doctor bar to a predetermined temperature may be provided.

In addition, as another invention, a coating roll having circumferential grooves carved at a predetermined pitch on one circumferential surface is disposed so as to be able to move toward and away from the substrate conveyance path in the vertical direction, and a doctor is attached to the coating roll. The roll coater is arranged so as to be movable toward and away from the roll coater, and includes means for heating at least one of the coating roll or the doctor bar to a predetermined temperature.

[For production]

In the roll coater according to the first invention, the width of the grooves carved in the coating roll is approximately three times the width of the grooves;
or even more, and the high viscosity coating liquid is sufficiently filled in the grooves, so the coating liquid is spread on the coating surface compared to when using a conventional coating roll, which has a relatively wide ridge width compared to the groove width. Due to its surface tension, it tends to spread in the axial direction of the coating roll.

In addition, by adjusting the force with which the doctor bar is pressed against the coating roll, the amount of coating liquid that enters the grooves of the coating roll can be controlled and the film thickness can be adjusted. It acts on

If a means is attached to maintain at least one of the coating roll or the doctor bar at a predetermined temperature, the temperature of the coating liquid can be adjusted to a constant temperature regardless of seasonal or local changes in room temperature, and the temperature of the coating liquid can always be adjusted to the required temperature. maintain a viscosity of

In addition to the above configuration, in a roll coater configured with a means for heating at least one of the coating roll or the doctor bar to a predetermined temperature, the coating roll or the doctor bar may be heated to a predetermined temperature. This reduces the viscosity of high-viscosity coating liquids.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show a first embodiment of the present invention, FIG. 1 is a plan view schematically showing the main parts thereof, and FIG. 2 is a perspective view of the main parts.

In these figures, the roll R forms a transport path for horizontally transporting the substrate p at a required constant speed, and a backup roll IB is rotatably attached to the frame 10 in the transport path. A coating roll IC is disposed above the backup roll IB, with both ends of the coating roll IC rotatably attached to a pair of elevating plates 11. Furthermore, the doctor bar I can be moved freely into and out of contact with the circumferential surface of the coating roll IC.
D is attached to the elevating plate 11 via sliders 17 at both ends thereof. The slider 17 is fitted into a pair of horizontal guides 18, 18' so as to be slidable along them. The force with which the doctor bar ID is pressed against the coating roll IC can be adjusted by rotating the bolt 19. The force for pressing the doctor bar ID against the coating roll IC can also be adjusted by rotating the bolt 19 using an appropriate drive source such as a servo motor.

The doctor bar ID and the coating roll IC are moved to the frame 1 together with the lifting plate 11 by the lifting mechanism 14.
It can be moved up and down along a guide 13.13' erected at 0.0. This elevating and lowering movement means 14 is arranged on the upper frame 12, and is driven by a servo motor,
It is constituted by 5 known separating means such as an air cylinder. Further, the coating roll IC is connected to a quick-rotation means (not shown) such as a motor, and is configured to rotate at a required number of rotations.

FIG. 3 is a cross section taken when the coating roll IC is cut in the axial direction, and is a partially enlarged view showing an example of the shape of the grooves carved on the circumferential surface of the coating roll IC.

Here, the grooves are carved with the ridges @F being 80 μm or less and the pitch P of the ridges 20 being 300 μm or more.

In addition, in FIG. 1, the code 30 is the doctor bar ID.
Although a nozzle for supplying a coating liquid having a viscosity of 1000 cP or more is shown, which is disposed above the doctor bar ID, a coating liquid supply port may be provided at a required portion of the doctor bar ID. In addition, 15 and 16 in FIG. 2 are respectively coating rolls I
This is a bearing for rotatably supporting C and backup roll IB on the elevating plate 11 and frame 10.

The roll coater having the above configuration operates as follows.

First, a coating roll IC whose circumferential surface has been grooved in a shape according to the viscosity of the coating liquid is rotated in advance at the required number of rotations, and a part of the circumferential surface of the coating roll IC is placed between a part of the circumferential surface and the doctor bar 1D. Supply coating liquid. When the coating liquid is uniformly filled on the surface of the coating roll IC, especially in each groove 21, the substrate P is placed on the conveyance roll R and conveyed horizontally, and the substrate P is transferred to the backup roll B and coating. It is inserted between the roll ICs, and the coating liquid filled in the grooves 21 of the coating roll IC is transferred onto the surface of the substrate p. This causes no practical problems.

A very uniform coating film can be formed.

Here, the cross-sectional area S of the groove 21 of the coating roll IC is determined as a square (where 0 is the opening angle of the groove). That is, the cross-sectional area S of the groove 21 is equal to the groove 1!1iT(P
-F) is proportional to the square of

Therefore, if the opening angle θ of the groove 21 is constant, the larger the peak @F, the smaller the cross-sectional area S becomes, and the pitch P
The larger the value, the larger the cross-sectional area S of Wt21 becomes. As a result of a coating test using a high viscosity coating liquid, it became clear that reducing the mountain width F and increasing the pitch P is effective in terms of uniformity of the coating film. In addition, groove 2
If the opening angle 0 of 1 is made small or ft21 is made deep, the entire groove 21 may not be completely filled with the coating liquid because the coating liquid has a high viscosity. Therefore, groove 2
The opening angle θ of 1 needs to have a value greater than a certain value depending on the viscosity of the liquid and the like.

For example, in an experiment in which a high viscosity liquid solder resist with a viscosity of around 20.0OOcp was applied to a printed circuit board, the peak 114TF in Fig. 3 was 20 μm, and the groove pitch P was 100 μm.
0 μm, s opening angle O of approximately 50 to 100', coating roll IC rubber hardness of 50°, doctor bar depression amount of 0°05ao, substrate conveyance speed of 3 m/min, and liquid temperature of 20°C. When the coating liquid was applied to the surface of the substrate, a coating film of liquid solder resist with a uniform thickness of about 40 μm could be obtained. The pushing amount of the doctor bar here is the reference value for adjusting the pushing force, and means the set amount of movement of the doctor bar based on the contact start position (line contact state) between the doctor bar and the coating roll. do. In addition, in high viscosity liquid solder resist, the mountain width F
When the thickness was 80 μm or more, there were parts where the coating liquid could not be applied to the substrate surface, that is, parts where the coating film was interrupted.

Next, in an experiment in which a highly viscous photosensitive polyimide resin with a viscosity of 3,200 cp was applied to the surface of a ceramic substrate, the groove pitch P was 350 μm, the peak #XF was 20 μm, and the opening angle O of the groove was approximately 60 to 110°. The rubber hardness of the roll IC is 50°, and the indentation amount of the doctor par is 0.411I.
11. When the coating liquid was applied to the substrate surface at a substrate conveyance speed of 5 m/min and a liquid temperature of 20°C, the film thickness was approximately 1.
A uniform polyimide resin coating film with a thickness of 0 μm could be formed. In addition, using the same coating roll and under the same conditions, approximately 20% of polyimide resin with a viscosity of 15,000 cp was
It was possible to coat the ceramic substrate with a uniform film thickness of 0 μm.

In this case, if the amount of indentation of the doctor par ID into the coating roll IC is 0.3 m, the thickness of the coating film will be 40 μm, and if the amount of indentation is O, lan, the thickness of the coating film will be 50 μm. Become. This is because when the amount of pushing of the doctor par ID into the coating roll IC is increased, the cross-sectional area of the groove 21 formed in the coating roll IC becomes smaller, and the amount of the coating liquid transferred to the substrate is reduced.

As described above, if the roll coater according to the present invention is used, high viscosity of 1,000 cp or more can be achieved.

For example, it has become possible to uniformly apply polyimide resin to the substrate surface. On the other hand, if a low viscosity coating liquid with a viscosity of 1.0OOcp or less is applied onto a substrate using the large pitch grooved coating roll according to the present invention, i#! The experimental result was that the air in No. 21 got mixed into the coating liquid and became bubbles, causing pinholes in the coating film on the substrate and making it impossible to increase the film thickness.

Next, in the second embodiment shown in FIG. 4, a heat-retaining housing 20 is installed around the roll coater 1 having the configuration shown in FIG.
0, and a blower F, a heater I-i, and a filter FL are arranged inside the heat-retaining housing 200,
They are connected to each other by piping. Then, by controlling the output of the heater H inside the housing 200 using the temperature measuring element TH and temperature control means (not shown).

It is possible to maintain a predetermined temperature.

Also, inside the housing 200, a drain bat 201,
A drain liquid receiver 202, a coating liquid storage tank 203, and a pump P that sends the coating liquid from the coating liquid storage tank 203 to the nozzle 30 are arranged inside. Further, entrance and exit chambers 204 and 205 are formed at the entrance and exit of the housing 200, respectively. These inlet/outlet chambers 204 and 205 prevent the air inside the housing 200 from easily flowing out to the outside and causing the temperature to drop.

The operation of the roll coater according to the embodiment shown in FIG. 4 will be explained. Temperature measuring element T arranged inside the housing 200
By controlling the output of the heater H and the temperature control means, the inside of the housing 200 is kept at a predetermined temperature, for example, 3.
Maintain at 0°C. At this time, both the roll coater 1 and the coating liquid in the housing 200 are maintained at a temperature of 30°C.

As can be seen from FIG. 9 above, liquid solder resist with a viscosity of about 200 PS at room temperature of 20°C is
At 0°C the viscosity drops to about 100 PS. And when the temperature is below 20℃.

As shown in FIG. 13, the coating liquid 4 forms a thread between the substrate p and the coating roll 2C.

Streaks often occur in the coating liquid 44 applied to the surface of the substrate p, but in the housing 200 where the temperature is maintained at around 30°C, the generation of thread-like coating liquid 43'' is extremely reduced, and unevenness and No more air bubbles.Especially,
The roll coater according to this embodiment is effective in cold regions and in winter.

In the third embodiment shown in FIG. 5, the main configuration of the roll coater is almost the same as that shown in FIGS. 1 and 2, but the roll coater shown in FIG. The inside of the coating roll IG' is hollow, and rotary joints 213 and 218' are attached to bearings 16 and 16' that support both supporting shafts at both ends of the coating roll IG'. Piping 2
13,212 are connected. Then, the heat medium flows through the piping 212 and into the coating roll IC' via the rotary joint 218', and the heat medium flows from inside the coating roll IC' through the rotary joint 218 and through the piping 213. The structure is such that it allows the flow of water to flow out.

In addition, the inside of the doctor bar LD' is also air-conditioned,
Pipes 214 and 21 are placed in the internal space of the doctor bar ID'.
5 are connected in communication so that a heat medium can flow inside the doctor par ID'.

Further, a pipe 210 for supplying the coating liquid is connected to the liquid reservoir mallet part of the doctor par 10', and the outer surface of the pipe 210 is covered with a jacket 211.
Pipes 216 and 217 are connected to the jacket 211 so that a heat medium can also flow through the jacket 211.

And piping 213.215.217 is heat medium pump P
The heating means 22 is connected to the suction side of the heat medium pump Po, and the discharge side of the heat medium pump Po is connected to the heating means 22 in which the temperature control means 'rC is inserted.
0, and a pipe 21 is connected to the output 1'' side of the heating means 220.
2,214,216 are connected.

Note that the heat medium may be oil or hot water.9Also, a structure may be adopted in which no heat medium is used to heat the doctor par 1-D', and an electric heater and a temperature measuring element are attached to the bottom surface of the doctor par 1-D'. . Further, the doctor bar ID' can be similarly implemented in place of the commonly used doctor roll.

In the embodiment shown in FIG. 5, the coating roll does not necessarily have grooves as shown in FIGS. 1 and 2, but the same effect as those shown in FIGS. 1 and 2 can be obtained. Of course, in the case of a coating roll having grooves as shown in FIGS. 1 and 2, the same effect can be obtained at a lower temperature.

FIG. 6 is a schematic diagram of the fourth embodiment.

The main configuration of the roll coater is the same as that in FIG.
The substrate p, which is being horizontally moved by, is heated from above,
The temperature of the substrate p can be raised to a predetermined temperature, for example, 50°C.

In addition to an electric heater, an infrared lamp, or the like, the heating means may be configured to spray hot air onto the substrate, and the hot air may raise the temperature of the substrate. In addition, a hot plate is provided, a belt conveyor is moved while sliding on the surface of the hot plate, a substrate is placed on the belt conveyor 1- and conveyed, and the temperature of the substrate is raised during the conveyance. It is also possible to have a configuration like this. Furthermore, the substrate is directly attached to the hot plate surface for a certain period of time.

A heated substrate can also be transported using a walking beam transport method. Alternatively, the entire device may be covered with a housing 200', similar to the embodiment shown in FIG.

In this example, the temperature of the substrate p is particularly raised to apply the coating liquid, so the lyophilicity of the surface of the substrate p to the high-viscosity liquid solder resist increases, and the coating liquid easily adheres to the substrate p and is not leveled. Ru.

The embodiment shown in FIG. 6 is especially effective when combined with the embodiment shown in FIG. 4 or 5.

FIG. 7 is a schematic configuration diagram of the fifth embodiment, and the main configuration of the roll coater is the same as that in FIG. 1. The roll coater 1 shown in FIG. 7 is provided with means 303 for heating the surface of the substrate p on its exit side. The heating means 303 includes a fan F, a heater H, a filter FL, and an air nozzle 302. Of course, this heating means may also be irradiation with infrared rays or the like. Further, similar to the embodiment shown in FIG. 4, the entire device may be covered with a housing 200''.

The roll coater according to the embodiment shown in FIG. 7 also has the same effects as the embodiment shown in FIG. 6. Further, a part of the hot air blown out from the air nozzle 302 of this heating means 303 is transferred to the roll coater 1 and the substrate p.
If the air is blown toward the contact position with the 10th
The filamentous coating liquid 43' as shown in the figure is easily separated,
In addition, leveling is promoted on the substrate surface.

As described above, in FIGS. 4 to 7, by providing appropriate heating means, the viscosity of the liquid during coating is lowered and uniform and smooth coating can be achieved.

On the other hand, in order to lower the viscosity of a highly viscous coating liquid, the coating liquid may be diluted. For example, as shown in Figure 10, which shows the relationship between the dilution rate and viscosity of liquid solder resist at about 25°C, when liquid solder resist is diluted by 1% with thinner, the viscosity at about 25°C changes from 125 PS to about 1
As can be seen from the diagram in FIG. 9 showing the relationship between temperature and viscosity of the undiluted coating liquid, the viscosity becomes almost the same as the viscosity at 30°C. However, even if the viscosity of the coating solution is lowered by diluting it, the state of the coating solution that adheres to the substrate surface will also change, as it will essentially change as shown in Figure 9 due to seasonal and local changes in room temperature. I will do it. In this case, in order to keep the viscosity constant, it is necessary to individually set appropriate dilution rates corresponding to temperature changes, which is extremely troublesome.

On the other hand, in the roll coater of the embodiment shown in Figs. 4 to 7, the temperature of the coating liquid is adjusted to a constant temperature regardless of seasonal and local changes in room temperature, and the coating liquid is maintained at the desired viscosity. Can be easily controlled.

In the sixth embodiment shown in FIG. 8, a second doctor 2D is attached to the surface of the coating roll IC of the roll coater 1 shown in FIG.

The location of the second doctor 2D is the first doctor par ID.
Preferably above. Further, the second doctor 2D may have the same structure as the first doctor par ID, or may be composed of a doctor roll as shown in the figure. In any case, the second doctor 2D is in contact with the surface of the coating roll IC with an appropriate pressure. In addition, when the second doctor is constituted by a doctor roll, the doctor roll may be freely rotatable.

It may also be a fixed type. In addition, if necessary, a coating liquid supply nozzle is attached to the inlet side of the second doctor 2D in the same way as the first doctor par ID, so that the coating liquid is also supplied from the second doctor 2D to the surface of the coating roll 1c. You may also do so.

In the roll coater according to the embodiment shown in FIG. 8, even if a difference in the film thickness of the coating liquid as shown in FIG. 14 temporarily occurs on the surface of the coating roll, the surface of the coating liquid can be immediately The condition is made uniform and there is no difference in film thickness.

〔Effect of the invention〕

Since the present invention is constructed and operates as described above, it produces the effects described below.

The roll coater according to the first aspect can evenly and uniformly apply a high viscosity coating liquid to a substrate surface with a desired film thickness. Furthermore, since a doctor bar is used, the film thickness can be easily controlled, and unlike conventional roll coaters, there is no possibility of stringiness on the coating roll and uneven coating.

The roll coater according to claim 2 is capable of constantly controlling the temperature of the coating liquid and coating the substrate surface with a coating liquid that is always maintained at a desired viscosity regardless of seasonal and local changes in room temperature. , promotes the formation of an even and uniform coating film. In addition, even if the speed at which the coating liquid is applied to the substrate surface is increased, a uniform coating film can be formed without unevenness, and productivity can be expected to be improved.

In addition, the roll coater according to claim 3 increases the temperature of the high viscosity coating liquid to a predetermined temperature and lowers the viscosity thereof, thereby solving the problems that conventionally occur when applying the high viscosity coating liquid to the substrate surface. Even with a high viscosity coating liquid, it is possible to coat the substrate surface evenly and uniformly with the required thickness. In addition, seasonal
The viscosity of the coating liquid can be easily controlled to the required viscosity regardless of local room temperature changes, and has good operability.

In addition, in the present invention, conventionally, a high viscosity coating liquid such as a liquid solder resist was applied to a printed circuit board by a screen printing method.

It can be applied using a roll coater, contributing to improved productivity and quality.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a main part schematically showing an embodiment of a roll coater according to the present invention, FIG. 2 is a perspective view of a main part of the roll coater, and FIG. 3 shows a coating roll along its axis. 4 to 8 are views showing different embodiments of the present invention, and FIG. 9 is a partially enlarged sectional view when cut in the direction of the liquid solder resist. The diagram of FIG.
Diagram for explaining the relationship between dilution rate and viscosity, No. 11
The figure is a side view of the main parts schematically showing a conventional roll coater.
FIG. 12 is a partially enlarged sectional view of a conventional coating roll cut in its axial direction, FIG. 13 is a partially enlarged side view of the roll coater shown in FIG. 11, and FIG. 14 is a partially enlarged side view of the roll coater shown in FIG.
FIG. 2 is a perspective view of main parts of a conventional roll coater. p...Substrate, ■...Roll coater, P...
Pitch, F...Mountain width. 21...Groove, IC...Coating roll, ■D...Doctor bar, 200...Housing, F...Fan, H...
・Heater, FL...filter, 212~2
17...Piping, 218.218'...Rotary joint. 220... Heating means, PO... Heat medium pump, 301... Infrared lamp (heating means), 303...
・Heating means, 2D...second doctor. ,, ;j)lney, 1 Agent Patent Attorney Takeo Mamiya ・□1 Figure 1 Figure 3 Figure 2 Figure 4 Figure 7 Figure 8 Figure 9 + 0 20 30 404
/1 (℃) 1C Figure 2 4 G 8
104 *(X)

Claims (3)

[Claims] 1. In a roll coater that applies a high viscosity coating liquid with a viscosity of 1000 cP or more to the surface of a horizontally transported substrate via a coating roll, grooves with a groove width of 80 μm or less are formed at a pitch of 300 μm in the circumferential direction of the circumferential surface of the coating roll.
m or more, the coating roll is arranged so as to be able to move toward and away from the substrate conveyance path in the vertical direction, and a doctor bar is arranged on the coating roll so that it can move toward and away from the substrate conveyance path.
A roll coater characterized in that the doctor bar is supported so as to move up and down together with the coating roll. 2. The roll coater according to claim 1, further comprising means for heating at least one of the coating roll and the doctor bar to a predetermined temperature. 3. In a roll coater that applies a high viscosity coating liquid with a viscosity of 1000 cP or more to the surface of a horizontally transported substrate via a coating roll, a coating roll with circumferential grooves carved at a predetermined pitch on its circumferential surface is transported. disposed so as to be movable toward and away from the path in the vertical direction, a doctor disposed so as to be movable toward and away from the coating roll, and means for heating at least one of the coating roll or the doctor to a predetermined temperature; A roll coater characterized in that a coating liquid of a desired viscosity is applied to the surface of a horizontally conveyed substrate.