JPH0647089B2 - Roll coater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roll coater for uniformly applying a high-viscosity coating liquid onto the surface of a thin plate-shaped substrate.

[Conventional technology]

As a device for applying a required coating liquid onto the surface of a substrate such as a printed wiring board using a roll coater, there has been conventionally known, for example, Japanese Patent Application Laid-Open No. 60-230658 (the title of the invention is "photosensitive liquid coating device for printed wiring board") ), A groove having a width W = 0.1 to 3 mm, preferably 0.5 mm, is formed on the peripheral surface of the roll 2C (see FIG. 11) on the side on which the photosensitive liquid is applied to the substrate. A photosensitive liquid layer formed on the peripheral surface of the roll having a groove F = 0.1 to 5 mm, preferably 0.5 mm (see FIG. 12), which is spirally engraved symmetrically with respect to the center of the roll. There is known a photosensitive liquid coating device that coats the surface of a substrate with a photosensitive liquid.

[Problems to be Solved by the Invention]

The coating liquid used in the coating apparatus described in JP-A-60-230658 is an anti-etching photosensitive liquid (etching photoresist) and has a viscosity of about several tens to several hundreds cP. For example, the viscosity of a solder-resistant photosensitive liquid (solder photoresist) has a liquid temperature of 2
Since it is about 20,000 cP or more at 0 ° C., the conventional roll coater cannot not only apply the photosensitive solution uniformly to the substrate surface, but also some portions cannot be applied completely.

In addition, a polyimide resin used as an interlayer insulating film for a glass substrate for liquid crystal or the like has a viscosity of about 100 at a liquid temperature of 28 ° C.
Although it is 0 cP, by the conventional roll coater,
It was not easy to apply it evenly.

For example, as shown in FIG. 12, when using a coating roll 2C in which grooves having a width W = 0.5 mm are engraved at an interval F = 0.5 mm, a polyimide resin having a viscosity of 1000 cP or more is applied to the substrate surface. However, a portion where it cannot be completely applied occurs on the substrate surface, resulting in uneven coating.

Further, FIG. 13 is an enlarged view of a part of the conventional roll coater 2 shown in FIG. 11, but when the viscosity of the coating liquid 4 becomes high, as shown in FIG.
Below the contact position between the 2C and the doctor roll 2D, the coating liquid 4 adheres not only to the coating roll 2C but also to the surface of the doctor roll 2D, and the surface of the coating roll 2C is covered with the required amount of the coating liquid 41. The amount was not adhered, and the coating liquid 44 having a required film thickness could not be formed on the surface of the substrate p.

Further, the coating liquid 41 attached to the coating roll 2C,
There is a problem in that a filamentous coating liquid 43 is generated between the coating liquid 42 attached to the doctor roll 2D, which causes unevenness in the film thickness of the coating liquid 44 applied to the surface of the substrate p.

Furthermore, after the coating roll 2C and the substrate p are brought into contact with each other, as shown in FIG. 13, a thread-shaped coating liquid 43 'is formed between the surface of the coating roll 2C and the coating liquid 44 on the surface of the substrate p. However, there is a problem that the coating liquid 44 cannot be uniformly applied to the surface of the substrate p.

Further, when the coating solution 43 'in the form of a thread is gradually thinned due to the rotation of the coating roll 2C and the progress of the substrate p, air is entrained to generate minute bubbles on the surface of the substrate p. There was a problem of letting it.

Furthermore, when a high-viscosity coating liquid is applied to the substrate p,
As shown in FIG. 14, the film thickness of the coating liquid on the surface of the coating roll 2C is thin in the portion 45 transferred to the substrate p and thick in the other portion 46. The difference in the film thickness on the surface of the coating roll 2C does not disappear even if the coating roll 2C is rotated once, and the coating roll 2C is rotated several times to eliminate the difference in the film thickness once generated. It took a thing. Therefore, when the substrate p is continuously passed between the coating roll 2C and the backup roll 1B, or when the substrate p longer than the circumferential length of the coating roll 2C is passed between them, the circle of the coating roll 2C is There is also a problem that the film thickness of the coating liquid 44 in the portion transferred to the surface of the substrate p beyond the circumference becomes thin.

All of the problems listed above, in the case of applying the coating liquid by a roll coater on the surface of the substrate to be conveyed,
This is caused by the high viscosity of the coating liquid. Therefore, the present invention, when applying a high-viscosity coating liquid such as a solder photoresist or a polyimide resin to the substrate surface, can be applied to the substrate surface of the high-viscosity coating liquid without the various problems described above. A technical problem is to provide a suitable roll coater.

[Means for Solving the Problems]

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 having a viscosity of 1000 cP or more to a surface of a substrate that is transported along a predetermined transport path. And a conveying means for conveying along the circumference, and a pitch of 300 μm or less in the circumferential direction of the peripheral surface with a mountain width of 80 μm or less.
a coating roll having a groove of μm or more, and an elevating member rotatably supporting the coating roll,
A doctor bar supported by the elevating member so as to be able to come in and out of contact with the coating roll, an adjusting unit provided on the elevating member for adjusting a pressing force of the doctor bar against the coating roll, and an elevating member. A support guide mechanism that freely supports and guides the elevating member up and down, and a doctor for the coating roll adjusted by the adjusting means by driving the elevating member that is elevated and lowered by being guided by the support guide mechanism. It is characterized in that it has an elevating drive means for moving the coating roll in the up-down direction with respect to the substrate conveyed along the conveying path while maintaining the pressing force of the bar.

A means for heating at least one of the coating roll and the doctor bar to a predetermined temperature may be additionally provided.

Further, as another invention, a transport means for transporting the substrate along the transport path, a coating roll for applying a coating liquid to the surface of the substrate transported by the transport means, and a rotatably supporting the coating roll. An elevating member, a doctor supported by the elevating member so as to be able to come into contact with and separate from the coating roll, an adjusting unit provided on the elevating member, for adjusting a pressing force of the doctor against the coating roll, and the elevating member. A support guide mechanism that supports a member so as to move up and down, and guides the lift member in the vertical direction, and the coating roll adjusted by the adjusting means by driving the lifting member that is guided by the support guide mechanism to move up and down. While maintaining the pressing force of the doctor against the substrate, raise the coating roll to the substrate transported along the transport path. And a driving means for moving in a direction, a coating solution supplying means for supplying a predetermined coating solution between the coating roll and the doctor, and at least one of the coating solution supplying means, the coating roll and the doctor. A roll coater is characterized in that it has means for heating to a predetermined temperature.

[Action]

In the roll coater according to the first aspect of the invention, the groove width formed on the coating roll is approximately three times the mountain width,
Alternatively, the coating liquid with high viscosity is sufficiently filled in the groove, so that the coating liquid on the coated surface is larger than that when a conventional coating roll having a relatively large width relative to the groove width is used. However, due to its surface tension, it easily spreads in the axial direction of the coating roll.

In addition, by adjusting the force that presses the doctor bar against the coating roll, you can control the amount of coating liquid that enters into the groove of the coating roll to adjust the film thickness and press the coating liquid like a conventional doctor roll. Act on.

When a means for maintaining at least one of the coating roll and the doctor bar at a predetermined temperature is attached, the temperature of the coating solution is adjusted to a constant temperature regardless of seasonal and local room temperature changes, and it is always required. Maintain the viscosity of.

Further, in addition to the above configuration, in a roll coater configured to have means for heating at least one of a coating roll, a doctor and a coating liquid supply means to a predetermined temperature, a coating roll, a doctor or a coating Since the liquid supply means can be heated to a predetermined temperature, the viscosity of the highly viscous coating liquid is reduced.

〔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 side sectional view schematically showing a main part thereof, and FIG. 2 is a perspective view of the main part.

In these drawings, the roll R forms a transport path for horizontally transporting the substrate p at a required constant speed, and the backup roll 1B is rotatably attached to the frame 10 in the transport path. Above the backup roll 1B, the coating roll 1C is rotatably attached to the pair of lift plates 11 at both ends thereof. Further, a doctor bar 1D is attached to the elevating plate 11 via sliders 17 at both ends thereof so as to freely come in contact with and separate from the peripheral surface of the coating roll 1C. The slider 17 is slidably fitted along a pair of horizontal guides 18 and 18 '. The force pressing the doctor bar 1D against the coating roll 1C can be adjusted by rotating the bolt 19. In addition, doctor bar 1D coating roll
The adjustment of the force pressing on 1C can also be performed by rotating the bolt 19 by an appropriate drive source such as a servo motor.

The doctor bar 1D and the coating roll 1C can be moved up and down along with the elevating plate 11 by the elevating drive means 14 along the guides 13 and 13 'standing on the frame 10. The lifting drive means 14 is arranged on the upper frame 12, and is composed of a known drive means such as a servo motor and an air cylinder. The coating roll 1C is connected to a rotation driving means (not shown) such as a motor, and is configured to rotate at a required rotation speed.

FIG. 3 is a cross-sectional view when the coating roll 1C is cut in the axial direction, and is a partially enlarged view showing an example of the shape of the groove formed on the peripheral surface of the coating roll 1C. Here, the grooves are engraved with a crest width F of 80 μm or less and a crest 20 forming pitch P of 300 μm or more.

In FIG. 1, reference numeral 30 denotes a nozzle arranged above the doctor bar 1D to supply a coating liquid having a viscosity of 1000 cP or more, but a coating liquid supply port should be provided at a required portion of the doctor bar 1D. You may comprise. Also, in FIG.
Reference numerals 15 and 16 denote bearings for rotatably supporting the coating roll 1C and the backup roll 1B on the lift plate 11 and the frame 10, respectively.

The roll coater configured as described above operates as follows.

First, while coating the coating roll 1C whose peripheral surface is grooved into the shape shown in FIG. 3 in advance at a required number of rotations, apply it between a part of the peripheral surface of the coating roll 1C and the doctor bar 1D. Supply the liquid. Then, when the coating liquid is evenly filled in the surface of the coating roll 1C, especially in each groove 21, the substrate p is placed on the transport roll R and horizontally transported, and the substrate p is backed up with the backup roll 1B and the coating roll. It is inserted between 1C and the coating liquid filled in the groove 21 of the coating roll 1C is transferred onto the surface of the substrate p. As a result, it is possible to form a substantially uniform coating film that has no practical problems.

Here, the cross-sectional area S of the groove 21 of the coating roll 1C is almost (However, θ is the opening angle of the groove.) That is, the cross-sectional area S of the groove 21 is proportional to the square of the groove width (PF).

Therefore, if the opening angle θ of the groove 21 is constant, naturally, the larger the mountain width F, the smaller the sectional area S, and the larger the pitch P, the larger the sectional area S of the groove 21. Then, as a result of a coating test using a coating solution having a high viscosity, it was clarified that reducing the crest width F and increasing the pitch P are effective for the uniformity of the coating film. If the opening angle θ of the groove 21 is made smaller or the groove 21 is made deeper, the coating liquid may not be completely filled in the groove 21 because the coating liquid has a high viscosity. Therefore, the opening angle θ of the groove 21 needs to be a certain value or more depending on the liquid viscosity and the like.

For example, in an experiment of applying a high-viscosity liquid solder resist having a viscosity of about 20,000 cP to a printed circuit board,
The peak width F in the figure is 20 μm, the groove pitch P is 1000 μm,
The groove opening angle θ is about 50 to 100 °, the rubber hardness (Shore hardness) of the coating roll 1C is about 50 °, the doctor bar pushing amount is 0.05 mm, the substrate transfer speed is 3 m / min, and the liquid temperature is 20. When the coating liquid was applied to the surface of the substrate under the condition of ° C, a coating film of the liquid solder resist having a uniform film thickness of about 40 µm could be obtained. Here, the pushing amount of the doctor bar is the reference value for adjusting the pushing force, and it means the movement setting amount of the doctor bar based on the contact start position (line contact state) between the doctor bar and the coating roll. To do. In addition, with high viscosity liquid solder resist,
When the peak width F was set to 80 μm or more, a portion where the coating liquid could not be applied to the substrate surface, that is, a portion where the coating film was interrupted occurred.

Next, in an experiment in which a highly viscous photosensitive polyimide resin having a viscosity of 3,200 cP was applied to the surface of the ceramic substrate, the groove pitch P was 350 μm, the mountain width F was 20 μm, the groove opening angle θ was about 60 to 110 °, and the coating was performed. The rubber hardness of roll 1C was 50 °, the pushing amount of the doctor bar was 0.4 mm, the substrate conveying speed was 5 m / min, and the coating liquid was applied to the substrate surface at a liquid temperature of 20 ° C. It was possible to form a uniform polyimide resin coating film of about 10 μm. Also,
Viscosity 1 under the same conditions with the same coating roll
5,000 cP of polyimide resin could be applied on the ceramic substrate with a uniform film thickness of about 20 μm.

In this case, when the pushing amount of the doctor bar 1D with respect to the coating roll 1C is 0.3 mm, the film thickness of the coating film is 40 μm, and when the pushing amount is 0.1 mm,
The thickness of the coating film becomes 50 μm. This is because when the pushing amount of the doctor bar 1D with respect to the coating roll 1C is increased, the cross-sectional area of the groove 21 engraved in the coating roll 1C is reduced and the amount of the coating liquid transferred to the substrate is reduced.

As described above, by using the roll coater according to the present invention, it becomes possible to uniformly apply even a high viscosity of 1,000 cP or more, for example, a polyimide resin to the substrate surface.
On the contrary, when a low-viscosity coating liquid having a viscosity of 1,000 cP or less is applied onto the substrate by the coating roll which is grooved at a large pitch according to the present invention, the air in the groove 21 becomes in the coating liquid. The experimental results showed that the film thickness could not be increased by mixing and forming bubbles, and pinholes were generated in the coating film on the substrate.

Next, in a second embodiment shown in FIG. 4, a heat insulation housing 200 is provided around the roll coater 1 having the structure shown in FIG.
And a blower F, a heater H, and a filter FL are arranged inside the heat insulating housing 200, and they are connected to each other by piping. Then, the inside of the housing 200 can be maintained at a predetermined temperature by controlling the output of the heater H by the temperature measuring element TH and the temperature control means (not shown).

In addition, the drain butt 201 and the drainage receiving
202, a coating liquid storage tank 203, and a pump P for sending the coating liquid from the coating liquid storage tank 203 to the nozzle 30 are internally provided. In addition, inlet and outlet chambers 204 and 205 are formed at the inlet and outlet of the housing 200, respectively. These doorways chamber 2
04 and 205 prevent the air in the housing 200 from easily flowing out to lower the temperature.

The operation of the roll coater according to the embodiment shown in FIG. 4 will be described. Temperature sensor TH installed in the housing 200
By controlling the output of the heater H by the temperature control means, the inside of the housing 200 is heated to a predetermined temperature, for example, 30 ° C.
To maintain. At this time, both the roll coater 1 and the coating liquid in the housing 200 are maintained at a temperature of 30 ° C.

Here, as can be seen from FIG. 9 showing the relationship between the temperature and the viscosity of the liquid solder resist, the viscosity is about 2 at room temperature 20 ° C.
The liquid solder resist of 00P has a viscosity of about 100P at a temperature of 30 ° C. Then, when the temperature is 20 ° C. or lower, as shown in FIG. 13, the coating liquid 4 becomes a filament between the substrate p and the coating roll 2C, and the coating liquid 44 coated on the surface of the substrate p is streaked. It often causes unevenness,
In the housing 200 in which the temperature is maintained at around 30 ° C., the filamentous coating liquid 43 ′ is extremely less generated, and unevenness and bubbles are eliminated. The roll coater according to this example is particularly effective in cold regions and winter.

The third embodiment shown in FIG. 5 is similar to that shown in FIGS. 1 and 2 in the main constitution of the roll coater, but the roll coater shown in FIG. The inside of the coating roll 1C ′ is hollow, and rotary joints 218 and 218 ′ are attached to bearings 16 and 16 ′ that support both support shafts at both ends thereof, and pipes 213 are attached to the rotary joints 218 and 218 ′. , 212 are connected. Then, through the pipe 212, the rotary joint 21
The heat medium is introduced into the inside of the coating roll 1C ′ via 8 ′, and the heat medium is caused to flow out from the inside of the coating roll 1C ′ through the rotary joint 218 and the pipe 213.

Further, the inside of the doctor bar 1D ′ is also hollow, and the pipes 214 and 215 are connected in communication with the internal space of the doctor bar 1D ′ so that the heat medium can be circulated inside the doctor bar 1D ′. I have to.

Further, a pipe 210 for supplying the coating liquid is connected to the liquid collecting trough portion of the doctor bar 1D ′, the outer surface of the pipe 210 is covered with a jacket 211, and a heat medium is also circulated in the jacket 221. The pipes 216 and 217 are connected to the jacket 211 so that the

The pipes 213, 215, 217 are connected to the suction side of the heat medium pump Po, and the discharge side of the heat medium pump Po communicates with the heating means 220 in which the temperature control means TC is installed, and the heating means 2 thereof.
Pipes 212, 214, and 216 are connected to the outlet side of 20.

The heat medium may be oil or warm water. Further, the heating medium may not be used for heating the doctor bar 1D ′, and an electric heater and a temperature measuring body may be attached to the bottom surface of the doctor bar 1D ′. Further, the doctor bar 1D 'may be replaced with a doctor roll that is generally used.

In the embodiment of FIG. 5, even if the coating roll is not necessarily provided with the grooves as shown in FIGS. 1 and 2, the same effect is exerted. Of course, in the case of the 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 configuration diagram of the fourth embodiment. The main structure of the roll coater is the same as that shown in FIG. 1, but a heating means 301 for heating the substrate p is additionally provided on the entrance-side transfer path, and is horizontally moved by the transfer roll R. The incoming substrate p can be heated from above and the substrate p can be heated to a predetermined temperature, for example, 50 ° C.

In addition to the electric heater and the infrared lamp, the heating means may be configured to eject hot air onto the substrate, and the temperature of the substrate may be raised by the hot air. In addition, a hot plate is provided, the belt conveyor is slidably moved on the surface of the hot plate, the substrate is placed on the belt conveyor and transported, and the temperature of the substrate is raised during the transport. It may have any configuration. Furthermore, it is also possible to bring the substrate into direct contact with the surface of the heating plate for a certain period of time and convey the heated substrate by the walking beam conveyance method.
Besides, as in the embodiment shown in FIG. 4, the entire device may be covered with a housing 200 '.

In this example, since the temperature of the substrate p is increased to apply the coating liquid, the lyophilicity of the surface of the substrate p with respect to the high-viscosity liquid solder resist is enhanced, and the coating liquid easily adheres to the substrate p and is leveled. It The embodiment shown in FIG. 6 has a great effect particularly 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 of FIG. The roll coater 1 shown in FIG. 7 is provided with a means 303 for heating the surface of the substrate p on the outlet side thereof. The heating means 303 includes a fan F, a heater H, and a filter F.
It is composed of L and the air nozzle 302. of course,
The heating means may be light irradiation with infrared rays or the like. Further, as in the embodiment shown in FIG. 4, the entire apparatus may be covered with the housing 200 ″.

The roll coater according to the embodiment shown in FIG. 7 also has the same effect as that of the embodiment shown in FIG. Further, when a part of the hot air blown from the air nozzle 302 of the heating means 303 is blown toward the contact position between the roll coater 1 and the substrate p, the filamentous coating liquid 43 as shown in FIG. 'Is easily separated, and leveling is promoted on the substrate surface.

As described above, in FIGS. 4 to 7, by providing an appropriate heating means, the liquid viscosity at the time of coating can be lowered so that uniform and smooth coating can be performed.

On the other hand, in order to reduce the viscosity of the high-viscosity coating liquid, the coating liquid may be diluted. For example, as shown in FIG. 10 which shows the relationship between the dilution rate and the viscosity of liquid solder resist at about 25 ° C., when the liquid solder resist is diluted by 1% with thinner, the viscosity at about 25 ° C. is about 125P to about 100P.
As shown in the graph of FIG. 9 showing the relationship between temperature and viscosity of the undiluted coating solution, the viscosity becomes almost the same as that at 30 ° C. However, even if the coating solution is diluted to reduce its viscosity, it will change essentially as shown in Fig. 9 due to seasonal and local room temperature changes, so the state of the coating solution adhering to the substrate surface will also change. Will be done. In this case, in order to keep the viscosity constant, it is necessary to individually set an appropriate dilution rate corresponding to the temperature change,
It's very troublesome. On the other hand, in the roll coater of the embodiment shown in FIG. 4 to FIG. 7, the temperature of the coating liquid is adjusted to a constant temperature and the coating liquid has the required viscosity regardless of seasonal and local room temperature changes. It can be controlled easily.

In the sixth embodiment shown in FIG. 8, the second doctor 2D is attached to the surface of the coating roll 1C of the roll coater 1 shown in FIG. The disposition position of the second doctor 2D is preferably above the first doctor bar 1D. The second doctor 2D may have the same structure as the first doctor bar 1D, or may be a doctor roll as illustrated. In any case, the second doctor 2D is in contact with the surface of the coating roll 1C with an appropriate pressure. In addition,
If the second doctor is a doctor roll,
The doctor roll may be rotatable or fixed. In addition, if necessary, a coating liquid supply nozzle is attached to the entrance side of the second doctor 2D in the same manner as the first doctor bar 1D, and the coating roll 1C is also provided from the second doctor 2D.
The coating liquid may be supplied to the surface of the.

In the roll coater according to the embodiment shown in FIG. 8, even if the film thickness difference of the coating liquid as shown in FIG. 14 temporarily occurs on the surface of the coating roll, the doctor roll 2D and the doctor bar are used. 1D 2-stage coating roll
Since the surface of 20 is doctored, the surface condition of the coating liquid is promptly uniformized and the film thickness difference is eliminated.

〔The invention's effect〕

Since the present invention is configured and operates as described above, it has the following effects.

The roll coater according to the first aspect can apply the high-viscosity coating liquid to the surface of the substrate evenly and uniformly with a required film thickness. Further, since the doctor bar is used, it is easy to control the film thickness, and unlike the conventional roll coater, the coating roll does not suffer from the stringing phenomenon and uneven coating.

The roll coater according to claim 2 is capable of constantly applying a coating solution having a required viscosity to the substrate surface by adjusting the temperature of the coating solution to a constant value regardless of seasonal and local changes in room temperature. , Promotes the promotion of the formation of a uniform coating film without unevenness. Further, even if the coating speed of the coating liquid on the substrate surface is high, a uniform and uniform coating film can be formed, and improvement in productivity can be expected.

Further, the roll coater according to the third aspect raises the temperature of the high-viscosity coating liquid to a predetermined temperature to reduce the viscosity thereof, and thus the inconvenience that has conventionally occurred when the high-viscosity coating liquid is applied to the substrate surface. Such a phenomenon can be eliminated, and even a high-viscosity coating liquid can be uniformly and evenly coated with a required film thickness on the substrate surface. In addition, seasonal
Regardless of the local room temperature change, the viscosity of the coating liquid can be easily controlled to the required viscosity, and the operability is good.

Further, according to the present invention, a high-viscosity coating liquid such as a liquid solder resist has been conventionally coated on a printed circuit board by a screen printing method, but it can be coated by a roll coater, which improves productivity and quality. Contribute to.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part schematically showing one embodiment of a roll coater according to the present invention, FIG. 2 is a perspective view of the main part of the roll coater, and FIG. 4 to 8 are partially enlarged cross-sectional views of the liquid solder resist when cut in the same direction, and FIG. 9 is for explaining the relationship between temperature and viscosity of the liquid solder resist. Of FIG. 10, FIG. 10 is a diagram for explaining the relationship between the dilution rate and the viscosity of the liquid solder resist, and FIG. 11 is
FIG. 12 is a partial enlarged cross-sectional view of a conventional coating roll schematically showing a conventional roll coater, and FIG. 12 is a partially enlarged cross-sectional view of the conventional coating roll when cut in the axial direction thereof. FIG. 13 is a roll coater shown in FIG. FIG. 14 is a partially enlarged side view of FIG. 14 and is a perspective view of essential parts showing a conventional roll coater. p ... substrate, 1 ... roll coater, P ... pitch, F ... mountain width, 21 ... groove, 1C ... coating roll, 1D ... doctor bar, 200 ... housing, F ... fan, H ...... Heater, FL …… Filter, 212 to 217 …… Piping, 218, 218 ′ …… Rotary joint, 220 …… Heating means, Po …… Heat medium pump, 301 …… Infrared lamp (heating means), 303… … Heating means, 2D …… The second doctor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichiro Hayashi 1 480 Takamiyacho, Hikone City, Shiga Daikonippon Screen Mfg. Co., Ltd. Hikone District Office (72) Inventor Kazuo Kase 480 Takamiyacho, Hikone City, Shiga Prefecture 1 Dainippon Screen Mfg. Co., Ltd. in Hikone area (56) References JP-A-61-287468 (JP, A) JP-A-61-189544 (JP, A) Actual development: Sho-61-191166 (JP, U) Special KO 55-5387 (JP, B2) KO 62-18284 (JP, Y2) KO 62-18289 (JP, Y2) KO 51-38930 (JP, Y2)

Claims (3)

[Claims] 1. A roll coater for applying a high-viscosity coating liquid having a viscosity of 1000 cP or more to a surface of a substrate transported along a predetermined transport path, a transport means for transporting the substrate along the transport path, and a peripheral surface. 300 μm pitch with a crest width of 80 μm or less in the circumferential direction
The coating roll (1C) in which the above grooves are formed, an elevating member (11) that rotatably supports this coating roll (1C), and the elevating member (1C) that can be contacted and separated from the coating roll (1C). 11) is supported by a doctor bar (1D) and the lifting member (11), the coating roll
Adjusting means (17, 18, 18 ', 19) for adjusting the pressing force of the doctor bar (1D) against (1C) and the elevating member (11) are supported so that the elevating member can be vertically moved. The support guide mechanism (12, 13, 13 ′) for guiding and the elevating member (11) that is elevated and lowered by being guided by the support guide mechanism (12, 13, 13 ′) are driven, and the adjusting means (17, 18,
18 ', 19) said coating roll adjusted by
Lifting drive means (14) for vertically moving the coating roll (1C) with respect to the substrate transported along the transport path while maintaining the pressing force of the doctor bar (1D) against (1C).
And a roll coater. 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. A roll coater for applying a high-viscosity coating liquid having a viscosity of 1000 cP or more to the surface of a substrate transported along a predetermined transport path, and a transport means for transporting the substrate along the transport path, and this transport. A coating roll (1C) for applying the coating liquid to the surface of the substrate conveyed by the means, an elevating member (11) that rotatably supports this coating roll (1C), and the coating roll (1C) And a coating roll provided on the elevating member (11), which is supported by the elevating member (11) so that the coating roll
Adjusting means (17, 18, 18 ', 19) for adjusting the pressing force of the doctor (1D) against (1C) and the elevating member (11) are supported so as to be vertically movable, and the elevating member is vertically guided. The supporting and guiding mechanism (12, 13, 13 ') for driving, and the elevating member (11) for ascending and descending guided by the supporting and guiding mechanism (12, 13, 13') are driven to adjust the adjusting means (17, 18). ,
18 ', 19) said coating roll adjusted by
While maintaining the pressing force of the doctor (1D) against (1C),
Elevating drive means (14) for moving the coating roll (1C) vertically with respect to the substrate transported along the transport path, and a predetermined coating liquid between the coating roll (1C) and the doctor (1D). A roll characterized by comprising: a coating liquid supply means for supplying; and a means for heating at least one of the coating liquid supply means, the coating roll (1C) or the doctor (1D) to a predetermined temperature. Coater.