JP2001179151A - Gravure coating method and gravure coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure coating method capable of remarkably and precisely applying a coating agent all over to surely obtain uniform thickness on every kinds of thin base materials and the gravure coater. SOLUTION: A continuous body like base material, the upper surface of which is supported by a pair of freely rotatable parallel attitude control rolls each having about 20-50 mm diameter, and which travels in a direction across the axial direction of both attitude control rolls is arranged in parallel to both attitude control rolls below the continuous body like base material between both attitude control rolls. A gravure roll having about 20-50 mm diameter has a gravure pattern on the whole outer peripheral surface. The coating agent is applied all over on the base material by rotating the gravure roll at a peripheral velocity having a relative velocity to the base material, wiping the excess coating agent with a doctor blade from the surface of the gravure roll before the application and applying the fixed quantity of the coating agent on the under surface of the base material at a position, where the upper surface of the base material is in a free state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure coating method and a gravure coating machine, and more particularly to a gravure coating method and a gravure coating method capable of uniformly coating a coating material with a uniform thickness even on a thin substrate. Related to coating machine.

[0002]

2. Description of the Related Art The present applicant discloses Japanese Utility Model Publication No. 2-7663 and Japanese Patent Publication No. 5-5355.
In JP-A No. 3 (1993), it is possible to always perform a good coating without generating vertical wrinkles even on a thin base material having a thickness of about 2 μm to 9 μm, which has been considered impossible to perform good coating. In addition, a microgravure coating system is proposed in which a solid coating having a uniform coating thickness can be applied using only a gravure roll without using a smoother, the configuration is simple, and the cost is low.

[0003] Further, there is a demand today for a solid substrate having a uniform coating thickness to be applied to a thin base material with higher accuracy and more reliably without vertical wrinkles or the like. This is because today's thin substrates come in a wide variety of types,
In addition, the number of so-called low-rigid materials having a small rigidity that easily causes deformation such as vertical wrinkles of the base material itself is increasing. This tendency is particularly strong in a base material for a thin film coating performed for forming a material for an electronic component such as a capacitor.

The present invention has been made in view of the above points, and is a gravure capable of applying a coating agent to all kinds of thin substrates with extremely high accuracy and with a uniform thickness. An object is to provide a coating method and a gravure coating machine.

[0005]

According to a first aspect of the present invention, there is provided a gravure coating method according to the present invention, comprising a pair of parallel freely rotatable attitude control rolls having a diameter of about 20 mm to about 50 mm. The lower part between the two attitude control rolls of the continuous body that is running in the direction orthogonal to the axial direction of the two attitude control rolls in a state where the upper surface is supported by the two attitude control rolls, is disposed in parallel with the two attitude control rolls, In addition, a gravure roll having a diameter of about 20 mm to about 50 mm in which a gravure pattern is formed on the entire circumference of the outer peripheral surface is rotated at a peripheral speed having a relative speed to the base material, and a doctor blade is applied from the surface of the gravure roll to a doctor blade. The excess coating agent is wiped off before coating, and a certain amount of coating agent is applied to the lower surface of the substrate at a position where the upper surface of the substrate is in a free state, and is applied to the substrate. Solid coating The features.

According to a third aspect of the present invention, there is provided a gravure coating machine according to the present invention, wherein a pair of parallel free rotatable rollers having a diameter of about 20 mm to about 50 mm for supporting an upper surface of a running continuous substrate. And a gravure roll for applying a coating agent to the lower surface of the base material at a position where the upper surface of the continuous body running between the two posture control rolls is in a free state. , Arranged in parallel with both attitude control rolls, and
A gravure roll having a diameter of about 20 mm to about 50 mm in which a gravure pattern is formed on the entire outer peripheral surface, and a predetermined amount of the coating agent is wiped off from the surface of the gravure roll before applying an excess coating agent. A doctor blade to be supplied to the coating section.

[0007] Further, in claim 1 or claim 3,
Each of the attitude control rolls is arranged close to the gravure roll.

[0008] In the present invention, by using the gravure coating machine according to the third aspect, by the method according to the first aspect, the continuous running while the upper surface is supported by a pair of parallel attitude control rolls. When applying a coating agent on the lower surface of the base material at a position where the upper surface of the body-shaped base material is in a free state,
The base material is stretched and run while holding the substrate flat without deformation such as vertical wrinkles between the two attitude control rolls and the gravure roll, and the coating agent is extremely accurate and surely uniform. Solid to the thickness.

Further, when the two attitude control rolls are respectively arranged close to the gravure rolls, the flatness of the base material between the two attitude control rolls and the gravure rolls can be more reliably maintained, and the coating agent can be used. Extremely accurate and
The solid coating can be reliably applied to a uniform thickness.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 10 will be described.

1 to 3 show an example of a gravure coating machine to which the method of the present invention is applied, and FIGS. 4 and 5 show an example of a gravure roll used for this.

First, in FIGS. 1 and 2, a continuous body 10 is horizontally moved from left to right in FIG. The base material 10 is unwound from a raw roll (not shown), and is stretched by a stretching roll 11, a pair of attitude control rolls 12, 12 and a stretching roll 11 as shown in FIG. (Not shown). The pair of attitude control rolls 12 have a diameter of about 20 mm to about 50 mm, and are freely rotatably supported. A gravure roll 13 having a diameter of about 20 mm to about 50 mm, having the same diameter as the attitude control roll 12, and having an outer peripheral surface made of a ceramic material, is provided below the base material 10 in an intermediate portion between the pair of attitude control rolls 12, 12. It is laid horizontally so that the axial direction is perpendicular to the running direction of the substrate 10. The gravure roll 13 is moved up and down by a known suitable lifting drive mechanism (not shown).
Bearings 16 are provided on a pair of support members 15
16 is rotatably supported. A rotational force is transmitted to the gravure roll 13 from a drive motor via a coupling (both not shown). In the present embodiment, the gravure roll 13 is rotated in the opposite direction (counterclockwise in FIG. 1) at the contact portion with the traveling direction of the substrate 10.
A gravure pattern 17 having a width smaller than the entire width of the base material 10 is formed on the outer peripheral surface of the gravure roll 13 made of a ceramic material over the entire circumference. An overflow receiver 18 is fixed on a base 14 below the gravure roll 13 by a tightening bolt 19. A coating agent supply nozzle 20 for supplying a coating agent to the gravure roll 13 is fixed on the overflow receiver 18. This coating agent supply nozzle 20 is formed to have the same width as the gravure pattern 17 of the gravure roll 13 as shown in FIG. Further, as shown in FIG. 1, the coating material supply nozzle 20 has two split nozzle pieces 20a, 20a.
b are integrally formed by interposing a thin interposed member 21 in the lower half and tightening and fixing each other. Further, a coating agent storage section 22 having a circular cross section long in the width direction for temporarily storing the coating agent fed from the outside is formed on the upper portion of the thin sandwiched object 21. A long and narrow communication groove 23 formed by not interposing the thin interposed object 21 is formed in the upper portion of the coating agent storage section 22. The upper end of the coating agent supply nozzle 20 is provided with a communication groove 2 from the coating agent reservoir 22.
An elongated nozzle portion 24 that is open upward is formed to store the coating agent fed through 3 and apply the coating agent to the gravure pattern 17 of the gravure roll 13. The length of the nozzle portion 24 is formed to be the same as the width of the gravure pattern 17 of the gravure roll 13.
Width-limiting closing members 28, 28 for closing both end portions of the nozzle portion 24 are fixed to both end portions in the width direction of 0. The gravure pattern 17 of the gravure roll 13
Immediately before applying the coating agent stored in the nozzle portion 24 to the lower surface of the base material 10, a doctor blade 25 for wiping excess coating agent applied to the gravure pattern 17 is provided. This doctor blade 25 is a gravure roll 1
Holder 27 rotatably supported on a pivot 26 parallel to 3
Mounted on And this doctor blade 25
Functions to fill the gravure pattern 17 of the gravure roll 13 with an appropriate amount of coating agent over the entire width and to wipe off the coating agent in the outer portion from both ends of the gravure pattern 17.

[0013] As shown in FIG.
11 and the posture control rolls 12 are rotatably mounted on an upper unit 30 which is swingable with a pivot 29. Particularly, in order to adjust the degree of parallelism with the gravure roll 13, the pair of attitude control rolls 12, 12 are mounted on the upper unit 30 with known position adjusting means 31 combining radial bearings, thrust bearings and the like at both ends. Have been. Further, the pair of attitude control rolls 12, 12 are pivotally supported so that they can rotate very lightly when the base material 10 runs while contacting the base material 10, and the rotation contact accuracy is set to 0.0.
It is supported within the range of 0.5 to 0.008 mm. Then, the upper unit 30 is moved so that the base material 10 spread between the pair of attitude control rolls 12 is brought into contact with and separated from the upper surface of the gravure roll 13. Further, the distance between the axes of the two attitude control rolls 12 and 12 and the gravure roll 13 is set to be approximately the diameter of each of the rolls 12 and 13 and arranged close to each other. Thus, the flatness of the base material can be maintained more reliably.

FIG. 4 shows the details of the gravure roll 13. In the present embodiment, the gravure roll 13 is manufactured as follows. First, ceramic material powder is plasma-sprayed on the outer peripheral surface of a metal roll core 13a made of steel or the like having rigidity and toughness to form a ceramic material layer 13b having a predetermined thickness. Next, the outer peripheral surface of the ceramic material layer 13b is cylindrically polished, and then the gravure pattern 17 is engraved by laser engraving. This gravure pattern 17
Are a number of parallel inclined grooves 17a. Each inclined groove 17a is formed by continuously engraving a small circular hole engraved by laser engraving with a part thereof being overlapped in the inclination direction. Further, as shown in FIG. 5, the predetermined length L at both ends in the axial direction of each inclined groove 17a is formed such that the groove depth becomes gradually smaller toward the end. After the inclined grooves 17a are engraved in this manner, vertical polishing may be performed as necessary.

Next, using the gravure coating machine shown in FIGS. 1 to 3 and the gravure roll 13 shown in FIGS. 4 and 5, solid coating of the coating agent according to the method of the present invention will be described in accordance with the steps.

The upper unit 30 is moved to the position shown by the dashed line in FIG. 1 for localization, and then the base material 10 is moved at a predetermined speed from left to right in FIG. At the same time, the coating agent supply nozzle 20
Into the nozzle portion 24 of the coating agent storage portion 22 and the communication groove 23.
Feed the coating agent through the gravure roll 13
Is rotated counterclockwise in FIG. Thereby, the nozzle portion 2
The lower portion of the gravure pattern 17 of the gravure roll 13 is immersed in the coating agent in 4, the coating agent is filled in the gravure pattern 17 and supplied toward the doctor blade 25 according to the rotation of the gravure pattern 17. . At this time, the supply amount of the coating agent into the nozzle portion 24 may be equal to or slightly larger than the supply amount of the coating agent to the gravure pattern 17. Then, the coating agent applied to the gravure pattern 17 is wiped off by the doctor blade 25 and is filled and supplied in an appropriate amount only in the entire width of the gravure pattern 17.
The surplus coating agent wiped by the doctor blade 25 is supplied to the gravure pattern 17 again, or flows down the surface of the coating agent supply nozzle 20 and is stored in the overflow receiver 18 and then again. It is returned into the storage unit 22. When an appropriate amount of the coating agent is supplied into the gravure pattern 17 of the gravure roll 13 in this way, the lower surface of the base material 10 is moved to the position indicated by the dashed line in FIG. The gravure roll 13 is raised together with the base 14 toward. Alternatively, the upper unit 30 is moved to the dashed line position in FIG. 1 so that the gravure pattern 17 of the gravure roll 13 is brought into contact with the lower surface of the base material 10 to apply the coating agent in the gravure pattern 17 to the lower surface of the base material 10. I do.

In this case, the gravure roll 13 is placed on the lower surface of the base material 10 at a position where the upper surface of the continuous base material 10 running with the upper surface supported by the two attitude control rolls 12 is free. Are brought into contact with each other to apply the coating agent, and the base material 10 is kept flat between the two attitude control rolls 12 and 12 and the gravure roll 13 which are parallel to each other without causing deformation such as vertical wrinkles. It is deployed and run. In particular, in the present embodiment, since the two attitude control rolls 12 and 12 and the gravure roll 13 are disposed close to each other, the base material 10 between the two attitude control rolls 12 and 12 and the gravure roll 13 is formed. Flatness can be more reliably maintained.

Furthermore, in the present embodiment, since the running direction of the base material 10 and the rotation direction of the gravure pattern 17 are opposite to each other at the mutual contact portion, the gravure pattern 17 is Is slipping. As a result, the pattern of the gravure pattern 17 applied to the lower surface of the substrate 10 slides in the direction opposite to the traveling direction of the substrate 10, so that the lower surface of the substrate 10 is uniformly coated with a coating agent to give a solid coating state. Coated. In this case, the coating thickness is adjusted by changing the relative speed difference between the substrate 10 and the gravure roll 13. Thus, according to the method of the present invention, a smoothing device can be omitted. In addition, since a pressure rubber roller or the like is not provided on the opposite side of the gravure roll 13 with respect to the base material 10, even when the base material 10 is thin, it is possible to apply the coating agent very well without generating vertical wrinkles. . In addition, since the gravure roll 13 and the two attitude control rolls 12 and 12 are thin, the contact area with the lower surface of the base material 10 is extremely small as compared with a conventional gravure roll having a large diameter, and the base material 10 is very well uniform. In addition, the coating agent can be applied to the base material 10 and the contact and separation between the base material 10 and the base material 10 are improved, so that the start and stop positions of the application can be accurately performed. Further, the cost of the gravure roll 13 is reduced, the size of the whole machine is reduced, and the driving force for the vertical movement is reduced.

Further, in the present embodiment, since the outer peripheral surface of the gravure roll 13 is made of ceramics composed of the ceramic material layer 13b, the gravure pattern 17 is freely engraved on the ceramic roll surface by a laser spraying method. The gravure roll 13 can be manufactured with extremely high accuracy. Therefore, the gravure roll 13 made of ceramics of the present embodiment is superior in durability to the gravure roll made of metal, does not require expensive mother meal for rolling, and has a different gravure pattern to be manufactured. The mother meal is not required for each roll, and since the mother meal is not strongly pressed against the cylindrical roll for the gravure roll at the time of rolling, the finishing accuracy of the gravure roll 13 can be easily maintained high. Further, by forming the gravure pattern 17 into a number of parallel inclined grooves 17a, the coating agent can be applied more uniformly, and a solid coating having an extremely uniform thickness can be applied. Further, by forming the gravure pattern 17 having the inclined grooves 17a so that the groove depth is gradually reduced toward the ends at both ends, the coating thickness at the both ends is made larger than the other portions. Prevention can be reliably prevented, and the coating agent can be applied more uniformly.

Further, with respect to good coating work according to the present embodiment, first, the point that a small-diameter gravure roll 13 and a doctor blade 25 are provided in the present embodiment will be described with reference to FIGS. .

In the present embodiment, the gravure roll 13 having a small diameter is used, and the coating agent in the gravure pattern 17 accurately measured by the doctor blade 25 is supplied to the coating portion on the base material 10, and the coating is performed. The coating is performed such that the running speed of the base material 10 and the peripheral speed of the gravure roll 13 are made different from each other in the processing section. Coating of the working agent is performed.

That is, as shown in FIG. 6, when the small-diameter gravure roll 13 of the present embodiment and the conventional large-diameter gravure roll 13a are brought into contact with the base material 10 from the lower surface at the same winding angle α, Gravure roll 1 for substrate 10
Naturally, the gravure roll 13 of the present embodiment has a shorter contact circumferential length of the gravure rolls 13 and 13a, and as a result, the contact area between the substrate 10 and the gravure rolls 13 and 13a is also smaller. Is smaller. By supplying the coating agent accurately measured by the doctor blade 25 to the coating section, the difference in the length of the contact circumferential direction and the size of the contact area and the supply of the coating agent to the coating section, the present embodiment cannot be achieved in the conventional example. Good coating can be applied as follows.

First, the coating agent stored in the gravure pattern 17 formed on the outer peripheral surface of the gravure roll and transported to the contact portion with the base material 10 is brought into contact with the base material 10 to contact the base material 10. Although it is to be transferred, when a contact portion between the gravure rolls 13 and 13a and the base material 10 is microscopically observed, when there is a traveling speed difference between the gravure rolls 13 and 13a and the base material 10, Is a gravure roll 1
The base material 10 and the gravure rolls 13, 13 in which a thin coating agent layer is slightly spread between the base material 10 and the base material 10 from the winding angle + the front and rear sides in the running direction of the base material 10 from the winding angle.
a is formed in the range of the angle formed by the small spaces 35 and 35a having a wedge-shaped cross section between the base material 1 and the coating agent from the coating agent layer portion.
0 is applied.

However, when the diameter of the gravure roll 13a is large as shown in FIG. 7A, when the gravure roll 13a is rotated in the opposite direction to the substrate 10 as in the present embodiment, the gravure roll 13a is rotated. The frictional force generated between 13a and the base material 10 becomes extremely large. In order for the substrate 10 to run smoothly in the presence of this large frictional force,
The base material 10 must travel with an extension tension greater than the frictional force. When a large extension tension acts on the substrate 10, the substrate 10 is pressed toward the outer peripheral surface of the gravure roll 13 a by a component force of the extension tension toward the center of the gravure roll 13 a, and the coating formed between the two. The agent layer (the coating agent is indicated by oblique lines in the figures (the same in FIGS. 8 and 9)) is eliminated, and the outer peripheral surface of the gravure roll 13a is directly contacted at the center of the winding angle α. As a result, the frictional force between the two is further increased.
Accordingly, the extension tension F to be applied to the substrate 10 must be further increased. When such a large spreading tension F acts on the thin base material 10, a plurality of vertical wrinkles 32, 32,... Extending in the spreading direction, that is, in the longitudinal direction are generated on the base material 10 as shown in FIG. Material 10 and gravure roll 1
3a becomes uneven in the width direction of the base material 10, and the base material 1 of the coating agent layer between the base material 10 and the gravure roll 13a.
The amount of the coating agent in the width direction of 0 was also non-uniform, and the amount of the coating agent applied to the base material 10 was also non-uniform, resulting in uneven coating. As the form of the coating unevenness, a plurality of vertical stripes 33 composed of a portion having a large coating amount and a portion having a small coating amount are generated along the vertical wrinkles 32 of the substrate 10. Further, in the conventional example, since the frictional force between the gravure roll 13a and the substrate 10 is large, it is difficult to run the substrate 10 at a constant speed, and the traveling speed of the substrate 10 increases or decreases. Horizontal stripes 3 in which a portion having a large amount of coating and a portion having a small amount of coating are repeated in the longitudinal direction of the substrate 10.
Four-shaped coating unevenness occurs. Furthermore, in the conventional example,
Since the diameter of the gravure roll 13a is large, when the front side in the running direction of the substrate 10 separates from the coating agent layer stored in the small space 25a having a wedge-shaped cross section formed between the substrate 10 and the gravure roll 13a. In some cases, vertical wrinkles occurred on the substrate 10. This is because, in the small space 35a, the base material 1 is moved from the top of the wedge to the running direction of the base material 10.
0 and the enlargement ratio of the interval between the gravure roll 13a is small,
In other words, the wedge shape becomes extremely sharp, the circumferential length of the coating agent layer stored in the small space 35a with respect to the gravure roll 13a increases, and the coating agent layer moves away from the end of the coating agent layer. The peeling force acting between the base material 10 and the base material 10 becomes large, a plurality of vertical wrinkles are generated on the base material 10, and uneven coating occurs. In the conventional example, these defective portions act in a complex manner, and the coating agent cannot be uniformly applied. Because of this, the coating thickness could not be adjusted.

Further, even if the coating agent is applied to the base material using only a small-diameter roll as in the prior art, and the above-described problem of the large-diameter roll can be overcome, the roll can be extended to the coating portion by the roll. Since the amount of the coating agent to be conveyed is not precisely measured to a predetermined amount, it is impossible to make the coating thickness uniform only by the coating process using the roll, and a smoother must be provided after all. Was.

On the other hand, according to the present embodiment, since the diameter of the gravure roll 13 is reduced as shown in FIG. 6, the contact area between the gravure roll 13 and the substrate 10 is reduced as described above, and Even when the substrate 13 is rotated in the opposite direction to the substrate 10, the frictional force generated between the gravure roll 13 and the substrate 10 can be kept extremely small.

Therefore, as shown in FIG.
The spreading tension f applied to the base material 10 necessary for smoothly traveling the substrate 10 can also be kept small. Due to the small extension tension f, the component force of the extension tension f toward the center of the gravure roll 13 is also reduced, and the lower surface of the base material 10 does not directly contact the outer peripheral surface of the gravure roll 13.
A thin coating agent layer is reliably formed between the substrate 10 and the gravure roll 13. By forming this thin coating agent layer, the frictional force between the substrate 10 and the gravure roll 13 is further reduced, and the spreading tension f applied to the substrate 10 is also reduced.

Therefore, according to the present embodiment, the base material 10
Even when the thickness is as thin as several μm, the vertical wrinkles 32 unlike the conventional case do not occur.

Since the frictional force between the substrate 10 and the gravure roll 13 is small and a thin coating agent layer is formed between the two, the resistance to the running of the substrate 10 is extremely small. That is, the base material 10 can be run at a constant speed.

Further, the small space 35 formed between the substrate 10 and the gravure roll 13 has a sharper wedge-shape than the conventional example because the diameter of the gravure roll 13 is small.
The circumferential length of the gravure roll 13 of the coating agent layer stored in the small space 35 becomes shorter, and the peeling force acting between the gravure roll 13 and the portion of the base material 10 moving away from the end of the coating agent layer also decreases. It is kept small, and no vertical wrinkles occur on the substrate 10.

Further, in the present embodiment, the base material 10
Travels at a constant speed, a constant amount of coating agent is transferred from the coating agent layer in the small space 35 to the base material 10, and the same amount of coating agent is transferred. Agent
The ratio between the running speed of the substrate 10 and the peripheral speed of the gravure roll 13 is set to a predetermined value by being supplied via each gravure pattern 17 of the gravure roll 13 rotating at a constant peripheral speed accurately measured by the doctor blade 25. At this time, the transfer amount and the supply amount of the coating agent become the same and are balanced, so that the coating thickness of the coating agent on the substrate 10 is constant. FIG. 10 shows the relationship between the coating thickness and the speed ratio. The balance between the transfer and the supply of the coating agent in the small space 35 is determined by the properties of the coating agent, that is, the surface tension and the viscosity, and the respective rotations of the gravure roll 13 and the running of the base material 10 to the coating agent. It is obtained by balancing exercise power and the like.

Next, the operation of providing the two attitude control rolls 12 will be described.

In the present embodiment, the lower surface of the base material 10 at a position where the upper surface of the continuous base material 10 running with the upper surface supported by the two attitude control rolls 12, 12 is free. The gravure roll 13 is brought into contact with the gravure roll 13 to apply the coating agent, so that the base material 10 causes deformation such as vertical wrinkles between the gravure roll 13 and the two attitude control rolls 12 and 12 which are parallel to each other. It is stretched and run while being kept flat without causing it to run. Particularly, in the present embodiment, since the two attitude control rolls 12 and 12 and the gravure roll 13 are arranged close to each other, the base material 10 between the two attitude control rolls 12 and 12 and the gravure roll 13 is provided. Can be more reliably maintained.

In the present embodiment, the above-mentioned actions act in a superfluous manner to form a coating agent layer formed between the substrate 10 and the gravure roll 13 running with flatness. Is always kept in a constant state, and the coating material is applied to the substrate 10 with extremely high accuracy and reliably in a uniform thickness.

In the present embodiment, the base material 10 is removed from the coating agent layer stored in the small space 35 having a wedge-shaped cross section.
To transfer the coating agent to a smoothing knife,
Without using a smoothing mechanism such as a smoothing roller, the engraving pattern of the gravure roll 13 can be smoothed and a solid coating having a uniform coating thickness can be applied.

Further, as shown in FIG. 9, the coating agent layer formed between the substrate 10 and the gravure roll 13 is formed exactly in parallel with the axial direction of the gravure roll 13.
The end of the application portion of the coating agent at the coating start position and the coating end position with respect to the base material 10 can be formed so as to be orthogonal to the running direction of the base material 10 accurately, and the coating finish is extremely high quality. Things.

Further, as shown in FIG. 10, by changing the relative speed of the peripheral speed of the gravure roll 13 with respect to the running speed of the substrate 10, the coating thickness of the coating agent on the substrate 10 can be adjusted. .

In FIG. 1, the gravure roll 13 is used.
Was rotated in the opposite direction to the substrate 10, but the doctor blade 25 was provided on the opposite side to the gravure roll 13, and the gravure roll 13 was rotated clockwise in FIG. By providing a relative velocity difference between the base material 10 and the base material 10, the base material 10 may be formed so as to apply a smoothed coating to the lower surface of the base material 10. In this case, when the peripheral speed of the gravure roll 13 is set to be higher than the traveling speed of the base material 10, particularly, when the peripheral speed is about twice, the smoothing of the coating agent is performed extremely well.

When the viscosity of the coating agent is high, the gravure roll 13 is rotated in the opposite direction to the substrate 10, and when the viscosity is low, the gravure roll 13 is rotated in the same direction as the substrate 10. In addition, the coating agent can be favorably smoothed. Further, by adjusting the relative speed between the base material 10 and the gravure roll 13 by changing the rotation speed of the gravure roll 13, for example, as shown in the characteristic diagram of FIG. The coating thickness of the coating agent can be adjusted.

It should be noted that the present invention is not limited to the above-described embodiment, and can be changed as needed.
For example, the gravure pattern in the above embodiment may be divided into a plurality of pieces in the axial direction of the roll and provided intermittently to form a stripe engraving, or may be formed partially in the circumferential direction of the roll. Further, although the gravure pattern in the above embodiment is an inclined groove, it may be a lattice or trapezoidal pattern. Further, a gravure roll made of a metal material may be used.

[0041]

The gravure coating method and gravure coating machine of the present invention are constructed and operated as described above, so that the coating agent can be applied to all kinds of thin substrates with high accuracy and reliability. It can be solid-coated with a uniform thickness.

Further, in the present invention, the upper surface is supported by a pair of parallel attitude control rolls by applying the coating by the method of claim 1 using the gravure coating machine of claim 3. Coating agent can be applied to the lower surface of the substrate at a position where the upper surface of the continuous substrate running in the free state is in a free state. The base material is stretched and run while maintaining a flat shape without generating deformation such as vertical wrinkles, and the coating agent is solidly applied to a very accurate and surely uniform thickness.

Further, by arranging the two attitude control rolls close to the gravure roll, the flatness of the base material between the two attitude control rolls and the gravure roll can be more reliably maintained. The agent can be applied with very high precision and reliably to a uniform thickness.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a gravure coating machine for performing a gravure coating method of the present invention.

FIG. 2 is a reduced sectional view taken along the line II-II in FIG.

FIG. 3 is a longitudinal sectional view showing an upper unit.

FIG. 4 is an enlarged half sectional view of an IV part in FIG. 1;

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is a schematic diagram comparing the configuration of the main part between the method of the present invention and the conventional example.

FIGS. 7A and 7B are explanatory views showing a coating agent layer formed between a substrate and a gravure roll in the conventional example and the present invention, respectively.

8A and 8B are schematic perspective views each showing a coating state in a conventional example.

FIG. 9 is a view similar to FIG. 7 of the present invention.

FIG. 10 is a characteristic diagram showing a relationship between a relative speed consisting of a peripheral speed of a gravure roll / a running speed of a substrate and a coating thickness of a coating agent on the substrate.

[Explanation of symbols]

 Reference Signs List 10 base material 12 attitude control roll 13 gravure roll 17 gravure pattern 25 doctor blade

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Yamada 149-1 Kadozawabashi, Ebina-shi, Kanagawa F-term in the Atsugi Plant of Yasui Seiki Co., Ltd. 4D075 AC25 AC34 AC94 DA03 4F040 AA22 BA12 BA26 CB27 4F042 AA22 DD03 DD04 DD07

Claims (4)

[Claims] 1. A continuous body running in a direction perpendicular to the axial direction of both attitude control rolls with its upper surface supported by a pair of parallel freely rotatable attitude control rolls having a diameter of about 20 mm to about 50 mm. The substrate is disposed below the two attitude control rolls in parallel with the two attitude control rolls, and has a diameter of about 20 in which a gravure pattern is formed all around the outer peripheral surface.
A gravure roll of about 50 mm to about 50 mm is rotated at a peripheral speed having a relative speed with the base material, and a surplus coating agent is wiped off from the surface of the gravure roll by a doctor blade before applying the surplus coating agent. A gravure coating method, wherein a coating agent is applied to a lower surface of the substrate at a position where the upper surface of the substrate is in a free state, and the substrate is solid-coated with the coating agent. 2. The gravure coating method according to claim 1, wherein each of the attitude control rolls is arranged close to the gravure roll. 3. A pair of parallel freely rotatable attitude control rolls having a diameter of about 20 mm to about 50 mm and supporting the upper surface of a running continuum base material, and running between the two attitude control rolls. A gravure roll for applying a coating agent on the lower surface of the base material in a position where the upper surface of the continuous base material is in a free state, which is disposed in parallel with both attitude control rolls, and an outer peripheral surface. A gravure roll having a diameter of about 20 mm to about 50 mm with a gravure pattern formed on the entire circumference of the gravure roll, and applying a predetermined amount of coating agent by wiping the surface of the gravure roll before applying the excess coating agent A gravure coating machine having a doctor blade for supplying the gravure to the section. 4. The gravure coating machine according to claim 3, wherein each of the attitude control rolls is arranged close to the gravure roll.