JP3807864B2 - Manufacturing method of coated body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a coated body in which a coating liquid is applied to a body to be coated on a backing roll.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a coating apparatus, a lip coater type coating apparatus having a backing roll on which a belt-shaped object is applied and a lip disposed so as to be in contact with the peripheral surface of the backing roll is known. ing.
[0003]
For example, as shown in FIG. 5, the lip coater type coating apparatus includes a backing roll 100 formed in a substantially cylindrical shape, and a lip 101 disposed to face the peripheral surface of the backing roll 100. Further, in this lip coater type coating apparatus, a belt-shaped coated body 102 is hung on the peripheral surface of the backing roll 100, and the backing roll 100 and the lip 101 face each other through the coated body 102. Further, in this lip coater type coating apparatus, a liquid reservoir 103 is formed at a position facing the backing roll 100 of the lip 101, and the coating liquid 104 is supplied to the liquid reservoir 103.
[0004]
In the lip coater type coating apparatus configured as described above, the backing roll 100 is rotated in a direction indicated by an arrow A in FIG. In this way, by rotating the backing roll 100, the coated object 102 formed in a band shape is sequentially sandwiched between the backing roll 100 and the lip 101. As a result, the coating liquid 104 supplied to the liquid reservoir 103 is sequentially applied onto the workpiece 102.
[0005]
[Problems to be solved by the invention]
By the way, in this lip coater type coating apparatus, foam may be contained in the coating liquid 104 coated on the coated body 102. In particular, as shown in FIG. 6, when the object to be coated 102 has a predetermined pattern 106 formed on the base film 105, a stepped portion 107 is formed by the pattern 106 on the object to be coated 102. It will be. Then, when the coating liquid 104 is applied on such an object to be coated 102, the foam 108 may be formed on the stepped portion 107.
[0006]
In order to suppress the generation of such foam 108, it is conceivable to first adjust the viscosity of the coating liquid 104. By using the coating liquid 104 having a low viscosity, the coating liquid 104 can be sufficiently distributed between the fine patterns 106, and the coating liquid 104 can be applied while preventing the generation of the foam 108.
[0007]
However, when the coating liquid 104 having a low viscosity is used, the coating liquid 104 applied on the pattern 106 flows, and as a result, the thickness of the coating liquid at the corner portion of the pattern 106 becomes thin. That is, when the coating liquid 104 having a low viscosity is used, the coating liquid 104 cannot be applied with a uniform film thickness.
[0008]
Further, in order to suppress the generation of the foam 108, it is conceivable that a low-pressure part is provided on the front side of the lip 101 in the traveling direction of the article 102 to reduce the carry-in of air into the liquid reservoir 103. . By providing the low-pressure part, the gas in the coating liquid 104 is removed in advance, and thereafter, the generation of the foam 108 can be suppressed by coating on the object to be coated 102.
[0009]
However, when a low pressure part is provided in the coating apparatus, the coating liquid 104 may be sucked into the low pressure part. For this reason, in a coating apparatus having a low pressure portion, the coating liquid 104 is wasted and productivity is deteriorated. Furthermore, the arrangement of such a low-pressure part is problematic because it significantly increases the cost of the coating apparatus itself.
[0010]
As described above, the conventional coating apparatus has a problem that the generation of the foam 108 in the applied coating liquid 104 can be reliably suppressed and a highly reliable coating film cannot be formed.
[0011]
Therefore, the present invention has been made in view of the above-described actual situation, and an applied body capable of forming an excellent coating film without foam being formed in the applied coating liquid. It aims at providing the manufacturing method of.
[0013]
[Means for Solving the Problems]
The present invention proposed in order to solve the above-described problem is that the coated object in which the pattern is formed so as to extend at least in the direction substantially orthogonal to the traveling direction and the stepped portion is formed The surface on which the pattern is formed is directed outward and wound around the circumferential surface of a rotationally driven cylindrical backing roll so as to travel, and is brought into contact with the surface on which the pattern is formed on the traveling object to be coated. The coating liquid is supplied to the liquid reservoir of the lip, and the coating liquid supplied to the liquid reservoir is circulated so as to generate a flow in one direction parallel to the central axis of the backing roll. The foam contained in the coating solution is degassed in a circulation path that circulates the part, and the coating solution that flows in the one direction near the surface of the coated body travels along the peripheral surface of the backing roll. To be coated Serial pattern contacting the formed surface, while sweeping away foam generated in the step portion, in which to perform the coating of the coating liquid to the pattern formed surface.
[0014]
In the manufacturing method of the coated body according to the present invention configured as described above, when the coating liquid is applied to the coated body applied to the backing roll, the coating liquid supplied to the liquid reservoir is circulated by the backing roll. It flows in the direction parallel to the axis of. And a coating liquid is apply | coated on a to-be-coated body in the state which made the coating liquid flow. Thus , the coating liquid is formed on the surface on which the pattern is formed and the step is formed so that the pattern is formed so as to extend at least in a direction substantially orthogonal to the traveling direction without generating foam. Can be applied.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a method for producing an applied body according to the present invention will be described below in detail with reference to the drawings.
[0016]
The coating apparatus used in the method of the present invention will be described . As shown in FIGS. 1 and 2, the coating apparatus includes a backing roll 1 having a substantially cylindrical shape and a lip disposed to face the backing roll 1. 2 and a belt-like object 3 is sandwiched between the backing roll 1 and the lip 2.
[0017]
Although not shown, the backing roll 1 is connected to a rotational drive control unit so as to be rotationally driven at a predetermined speed around an axis. The backing roll 1 is driven to rotate in a state in which the objects to be coated 3 are overlapped, thereby causing the objects to be coated 3 to travel in a predetermined direction. Specifically, the coated body 3 travels at a speed of about 0.5 to 5 m / min when the backing roll 1 is rotationally driven.
[0018]
In this coating apparatus, the lip 2 includes a first liquid reservoir 4 that is smaller than the width of the peripheral surface of the backing roll 1, and a second liquid reservoir connected to the first liquid reservoir 4. And a coating liquid supply unit 6 connected to the second liquid reservoir 5. In this coating apparatus, the first liquid reservoir 4 is connected to an inflow pipe 7 a and a discharge pipe 7 b of a circulation circuit that circulates the coating liquid in the first liquid reservoir 4 . As shown in FIG. 3, the circulation circuit includes a deaeration device 8 disposed in the middle of the circuit, a pump 9 for circulating the coating liquid in the circuit, and a subsequent stage in the circulation direction with respect to the pump 9. And the filter device 10 disposed in the.
[0019]
The lip 2 includes a head main body 11, a lid body 12 attached to the head main body 11, and a liquid reservoir wall 13 attached to the lid body 12. And since the recessed part 14 is formed in the surface attached to the head main body 11 of the cover body 12, the 2nd liquid reservoir part 5 is formed when the head main body 11 and the cover body 12 are combined. Further, the first liquid reservoir 4 is formed by combining the head body 11, the lid body 12, and the liquid reservoir wall 13. For this reason, the first liquid reservoir 4 has an opening at a portion facing the backing roll 1. Further, at this time, the head main body 11 and the upper end portion of the lid body 12 are opposed to each other with a predetermined interval, and therefore a gap connecting the first liquid reservoir 4 and the second liquid reservoir 5. Will be formed.
[0020]
In the lip 2, a doctor edge 15 is integrally formed at a portion of the head body 11 closest to the backing roll 1. The doctor edge 15 is disposed at a predetermined value with respect to the object 3 applied to the backing roll 1 and can regulate the film thickness of the coating liquid. That is, the distance between the doctor edge 15 and the object to be coated 3 is the film thickness of the coating liquid.
[0021]
Further, a slit 16 is formed in the lip 2 to adjust the distance between the doctor edge 15 and the coated body 3, and an adjustment bolt 17 is screwed so as to penetrate the slit 16. And the space | interval of the slit 16 is adjusted by adjusting the tightening degree of this adjustment bolt 17, As a result, the space | interval of the doctor edge 15 and the to-be-coated body 3 is adjusted.
[0022]
On the other hand, in the lip 2, the coating liquid supply device 6 is connected to a jet port 18 formed in the second liquid reservoir 5. As shown in FIG. 3, the coating liquid supply device 6 discharges the coating liquid supply source 19 and the coating liquid in the coating liquid supply source 19 and discharges it into the second liquid reservoir 5. And a filter device 21 disposed downstream of the pump 20.
[0023]
In the coating apparatus configured as described above, when the coating liquid is applied onto the coated body 3, first, the belt-shaped coated body 3 is first hung on the peripheral surface of the backing roll 1, and the coating liquid supply apparatus 6 ejects the ejection port. The coating liquid is supplied from 18 into the second liquid reservoir 5. Then, by continuing to supply the coating liquid into the second liquid reservoir 5, the coating liquid is also supplied into the first liquid reservoir 4 and is applied to the peripheral surface of the backing roll 1. It will contact | abut to the to-be-coated body 3. FIG.
[0024]
In this coating apparatus, the coating liquid in the first liquid reservoir 4 is circulated by the circulation circuit. Specifically, the coating liquid supplied into the first liquid reservoir 4 is discharged from the discharge pipe 7b and again flows from the inflow pipe 7a by driving the pump 9. Accordingly, in this coating apparatus, a flow is generated in the coating liquid in the first liquid reservoir 4 in the direction indicated by the arrow B in FIG. In other words, in this coating apparatus, so that the the first liquid reservoir coating solution filled in the 4, the flow is generated in the central axis and parallel to one direction of the backing roll 1.
[0025]
In the coating apparatus, the backing roll 1 is rotationally driven at a predetermined speed in a state where the flow is generated in the coating liquid in the first liquid reservoir 4 as described above. Thereby, the to-be-coated body 3 applied to the backing roll 1 sequentially travels on the peripheral surface of the backing roll 1 and sequentially comes into contact with the coating liquid filled in the first liquid reservoir 4. As a result, the coating liquid is sequentially applied onto the substrate 3. At this time, the doctor edge 15 formed on the lip 2 controls the thickness of the coating liquid on the substrate 3 by scraping a predetermined amount of the applied coating liquid.
[0026]
In particular, according to this coating apparatus, when the coating liquid is applied, a predetermined flow is generated in the coating liquid filled in the first liquid reservoir 4. For this reason, in this coating apparatus, as shown in FIG. 4, the to-be-coated body 3 has a pattern 25 formed so as to extend in a direction substantially orthogonal to the traveling direction of the to-be-coated body 3. Even if it is a thing, a coating liquid can be apply | coated reliably. More specifically, in the coated body 3 as shown in FIG. 4, the step portion between the pattern 25 and the substrate 26 is formed so as to be substantially orthogonal to the traveling direction of the coated body 3. Specifically, a flexible polyimide resin is used as the substrate 26, and a copper pattern having a width of about 30 μm and a thickness of about 12 to 18 μm is used at intervals of about 20 μm.
[0027]
When such a coated body 3 is used, in the coating device, if no flow is generated in the first liquid reservoir 4 in the direction indicated by the arrow B in FIG. It may end up. That is, in the to-be-coated body 3 shown in FIG. 4, since the pattern 25 is delicately formed and the direction in which the step portion extends and the running direction are substantially orthogonal, foam is formed in the step portion. It will be done.
[0028]
However, in this coating apparatus, since the flow is generated in the first liquid reservoir portion 4 in the direction indicated by the arrow B in FIG. 1, it is possible to push away the foam that is going to stay on the step portion. That is, in this case, the direction in which the step portion extends and the direction of flow (arrow B in FIG. 1) are parallel, so that the foam that tries to stay on the step portion can be swept away. For this reason, in the coating apparatus mentioned above, even if it is the to-be-coated body 3 which has the pattern 25 as shown in FIG. 4, a coating liquid can be apply | coated reliably. In particular, in this coating apparatus, even when a polyamic acid solution having a viscosity of 10,000 to 30,000 (cps) is used as the coating solution, it is possible to prevent foam from remaining.
[0029]
At this time, the coating liquid containing foam is discharged from the discharge pipe 7 b and supplied to the deaeration device 8. The deaeration device 8 is configured to have, for example, a tank to which a coating liquid containing foam is supplied from above and a pipe for discharging the coating liquid from below the tank. And in this deaeration device 8, when the coating liquid is supplied into the tank, the foam contained in the coating liquid moves upwards of the tank. For this reason, the coating liquid which does not contain foam will be filled below the tank. Therefore, in this deaeration device 8, the degassed coating liquid containing no foam can be circulated by discharging the coating liquid from the pipe below the tank. The deaeration device 8 may be a device that is provided with a decompression device for decompressing the inside of the tank and forcibly removes foam.
[0030]
The coating liquid from which the foam has been removed circulates in the circulation circuit at a predetermined flow rate by the pump 9 and passes through the filter device 10 to remove impurities and the like. For this reason, in this circulation circuit, it is possible to supply the first liquid reservoir 4 with the coating liquid that has been reliably degassed and from which impurities have been removed. Therefore, in this coating apparatus, the flow in the direction indicated by the arrow B in FIG. 1 can be generated in the first liquid reservoir 4 and the foam of the coating liquid can be effectively removed. Thereby, according to this coating device, a coating liquid can be reliably apply | coated on the to-be-coated body 3. FIG.
[0031]
Moreover, in the coating apparatus mentioned above, although the to-be-coated body 3 has a pattern formed in the direction substantially orthogonal to the running direction, the coating apparatus uses such a to-be-coated body 3. It is not limited to. That is, in the coating apparatus described above, the pattern formed on the object to be coated may be formed at any angle with respect to the running direction of the object to be coated. This coating apparatus generates the flow in the direction indicated by the arrow B in FIG. 1 in the first liquid reservoir 4 regardless of the direction of the pattern formed on the coated body. The coating liquid can be reliably applied without leaving foam on the body.
[0032]
Although the above-described coating apparatus includes the lip 2 having the first liquid reservoir 4 and the second liquid reservoir 5, the coating apparatus used in the method of the present invention has at least one liquid. As long as it has a reservoir, it may have a lip of any configuration.
[0033]
【The invention's effect】
As described above in detail, when the coating liquid is applied to the coated body applied to the backing roll, the manufacturing method of the coated body according to the present invention uses the circulating means to supply the coating liquid supplied to the liquid reservoir. Flow in one direction parallel to the axis of the backing roll. Therefore, the present invention method, it is possible to apply the coating liquid in a state in which flowing the coating liquid onto the medium to be coated, the foam generated on the member to be coated can be removed by the flow of the coating liquid . Therefore, in this manufacturing method, the foam is left on the surface on which the pattern of the coated body in which the pattern is formed so as to extend at least in the direction substantially orthogonal to the traveling direction and the stepped portion is formed. Since the coating solution can be applied without any problem, a highly reliable coating film can be formed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an example of a coating apparatus used in a method of the present invention.
FIG. 2 is a longitudinal sectional view of a main part of the coating apparatus shown in FIG.
FIG. 3 is a schematic configuration diagram schematically showing a coating liquid supply device and a circulation circuit of the coating device.
FIG. 4 is a perspective view of a main part of an object to be applied used in a coating apparatus.
FIG. 5 is a cross-sectional view of an essential part schematically showing a conventional coating apparatus.
FIG. 6 is a cross-sectional view of an essential part showing an object to be coated on which a coating liquid has been applied using a conventional coating apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Backing roll, 2 lip, 3 to-be-coated body, 1st liquid reservoir part, 5 2nd liquid reservoir part, 6 coating liquid supply apparatus, 7a inflow pipe, 7b discharge pipe, 8 deaeration apparatus, 9 pump, 10 Filter device, 11 Head body, 13 Liquid reservoir wall, 16 Slit

Claims (1)

A cylinder that is rotationally driven with a pattern formed so as to extend at least in a direction substantially orthogonal to the traveling direction and a stepped portion being formed, with the surface on which the pattern is formed facing outward. Wound around the circumferential surface of the shaped backing roll,
The coating liquid is supplied to the liquid reservoir portion of the lip that is in contact with the surface on which the pattern of the traveling object is formed, and the coating liquid supplied to the liquid reservoir portion is connected to the central axis of the backing roll. Circulate so that a parallel unidirectional flow occurs,
Furthermore, degassing the foam contained in the coating solution in the circulation path circulating through the liquid reservoir,
Occurred at the stepped portion by contacting the surface of the substrate to be coated, which travels along the peripheral surface of the backing roll, with the coating liquid flowing in the one direction near the surface of the substrate to be coated. A method for producing a coated body, wherein the coating liquid is applied to the surface on which the pattern is formed while the foam to be washed away .

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