JP2002066421A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus having a friction resistance against a coating solution and capable of stably and uniformly coating a flexible strip- like support with the coating solution. SOLUTION: The groove surfaces 11a, 11b and 12a, 12b, which form first and second slots 11 and 12, and pockets 20 and 21 are subjected to grinding processing so as to have desired surface roughness suitable for reducing the coefficient of friction against the coating solution. At this time, the grove surfaces 11a, 11b and 12a, 12b are subjected to grinding processing along the outflow direction of the coating solution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a thin layer to a traveling flexible belt-like support, and more particularly to a coating head for discharging a coating liquid.

[0002]

2. Description of the Related Art Generally, as a prior art of a coating apparatus for forming a thin layer, there is one disclosed in Japanese Patent Publication No. Hei 6-77712 (hereinafter referred to as a first prior art).

[0003] The coating apparatus shown in the first prior art has a coating head as shown in FIG. 4, the coating head comprising a back edge 2 and a first doctor edge 3 forming a first slot 1, A second doctor edge 5 forming a second slot 4 together with the first doctor edge 3 is provided.

A first slot 1 and a first slot 1 are provided inside the coating head.
Pockets 6a and 6b each having a substantially circular cross section communicating with the second slot 4 are formed. Then, the coating liquid is sent from the liquid supply means (not shown) in the directions of arrows B1 and B2 via the pipes 7a and 7b, respectively, and is stored in the pockets 6a and 6b. It is pushed out to each outlet of the two slots 4, and the direction of the arrow C1,
It is configured to be discharged to C2.

[0005] The flexible belt-shaped support 8 is fed from the back edge 2 side to the back edge 2, the first doctor edge 3, and the second doctor edge 5 by a feeding means of the flexible belt-shaped support 8 not shown. The vehicle travels in the arrow direction A.

When the flexible belt-like support 8 runs, the first coating liquid in the pocket 6a is discharged from the first slot 1 and applied to one surface of the flexible belt-like support 8. afterwards,
The second coating liquid, which is located on the downstream side in the traveling direction of the flexible belt-shaped support member 8 and is pushed out of the pocket 6b to the outlet of the second slot 4, is applied over the first coating liquid. Is done. As described above, when the flexible belt-shaped support 8 travels, each coating liquid is discharged before and after, and the flexible belt-shaped support 8 is coated with two layers of coating liquid.

[0007]

The thickness of the coating liquid applied to the flexible belt-like support 8 is equivalent to several to several tens of microns, and the thickness of the slots 1 and
Since slot 4 is necessarily a bottleneck, slot 1
When the coating liquid flows through the slot 4, considerable friction occurs between the coating liquid and the inner surfaces of the slots 1 and 4. For this reason, it becomes difficult for the coating liquid to flow, and the path of the slots 1 and 4 is 500 mm.
When the length of the coating liquid is longer than the above, there is a problem that the discharge pressure of the coating liquid varies, making it difficult to uniformly control the thickness of the coating liquid. In addition, there is also a problem that the coating liquid is solidified on the groove surface and it takes time to clean.

In view of the above circumstances, an object of the present invention is to provide a coating apparatus capable of applying a coating liquid stably and uniformly to a flexible belt-like support with low frictional resistance to the coating liquid. .

[0009]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. In the present invention, a coating head for applying a coating liquid on a flexible belt-shaped support running in one direction is provided, and the coating head is arranged at least sequentially in a running direction of the flexible strip-shaped support. A coating device having two members, wherein a slot through which the coating liquid flows toward the flexible belt-shaped support member is formed between the members; a groove surface forming the slot of the member; However, it is polished to a desired surface roughness so as to reduce friction with the coating solution.

As described above, if the groove surface forming the slot of the member is polished and formed to have a desired surface roughness so that the coefficient of friction with the coating liquid is reduced, the slot of the slot through which the coating liquid flows can be formed. Even when the path is long, when supplying the coating liquid, the coating liquid can be supplied smoothly, so that the discharge pressure of the coating liquid discharged from the slot is made uniform in the direction in which the member extends, and Time can be stabilized at each position. Thus, it is possible to satisfactorily control the uniform thickness of the coating liquid. In addition, since the separation of the coating liquid on the groove surface is improved, the coating liquid can be prevented from adhering and solidifying on the groove surface, and the groove surface can be easily cleaned.

Further, in the present invention, the groove surface is polished along a direction in which the coating liquid flows. Alternatively, a coating film for reducing friction with the coating liquid is formed on the groove surface. As described above, when the groove surface of the member is polished along the flow direction of the coating liquid or has a coating film that reduces the coefficient of friction, the flow of the coating liquid becomes smoother, and the discharge pressure is reduced. Stabilization can be further achieved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The coating apparatus has a coating head 10, the coating head 10 forming a first slot 11, a back edge 13 and a first doctor edge 14, and a second doctor 12 forming a second slot 12 together with the first doctor edge 14. An edge 15 is provided.
These back edge 13, first and second doctor edges 1
Reference numerals 4 and 15 are sequentially arranged along the traveling direction A of the flexible band-shaped support 19, and furthermore, the front ends thereof include a back edge tip 16 made of cemented carbide and first and second doctor edge tips 1
7, 18 are mounted respectively. Here, the back edge tip 16, the first and second doctor edge tips 17, 1
Reference numeral 8 is made of a cemented carbide.

The flexible band-shaped support 19 is moved by the feeding means of the flexible band-shaped support 19 (not shown) to form the back edge 1.
3 from the back edge 13, the first doctor edge 1
4, the vehicle travels in the arrow direction A toward the second doctor edge 15. Then, the flexible belt-shaped support 1
9, the coating liquid is supplied by a liquid supply means (not shown), and the coating liquid flows through the pockets 20 and 21 and the first slot 11 and the second slot 12, so that one surface of the flexible band-shaped support 19 is formed. It is configured such that the application liquid is applied in a superimposed manner. In this example, the coating liquid in this case is for forming a base material sheet used for the green sheet of the multilayer ceramic capacitor. For example, the liquid containing the dielectric ceramic powder, and the composition thereof were slightly changed. It consists of two types, such as a dielectric-containing liquid.

In this embodiment, the groove surface 11a of the back edge 13 forming the slot 11 and the groove surface 11b of the first doctor edge 14, and the groove surface 12a of the first doctor edge 14 forming the slot 14 The groove surface 12b of the 2-doctor edge is polished to a desired surface roughness so that the coefficient of friction with the coating liquid is reduced. For example, FIG. 2 shows a groove surface 11b polished to a desired surface roughness.
It shows. As shown in FIG. 2, the groove surface 11b
It has a groove surface 14a of the first doctor edge 14 and a groove surface 17a of the first doctor edge tip 17, all of which are polished. Similarly, the groove surface 11a
Is a groove surface 13a of the back edge 13 and a groove surface 16a of the back edge tip 16. A groove surface 12a is a groove surface 14b of the first doctor edge 14 and a first doctor edge tip 1
7 has a groove surface 17b, and the groove surface 12b has a groove surface 15a of the second doctor edge 15 and a groove surface 18a of the second doctor edge tip 18, respectively. It is polished to a desired surface roughness. In addition, the pockets 20, 21 are polished with the same surface roughness as those of the groove surfaces. The surface roughness at the time of polishing is slot 1
What is necessary is just to select suitably inside 1 and 12 according to the kind of the said coating liquid, For example, when the thing for forming the base material sheet used for a green sheet is selected as a coating liquid, the surface roughness of all is 1S or less. It is desirable that the surface be polished to a roughness, preferably a roughness of 0.8 S or less. Note that in FIG.
2 is a bolt hole for assembly.

Further, at the time of the above-mentioned polishing, the groove surface 11 is formed.
Each of a, 11b, 12a, and 12b is polished along the direction in which the coating liquid flows.

As described above, the groove surfaces 11a, 11b, 12
If the a and 12b and the pockets 20 and 21 are polished and formed to have a desired surface roughness so as to reduce the friction coefficient with respect to the coating liquid, the coating liquid is supplied smoothly when the coating liquid is supplied. Therefore, the discharge pressure of the application liquid discharged from the slots 11 and 12 can be reduced by the back edge 12, the first
The second doctor edges 14 and 15 can be made uniform in the direction in which they extend, and can be stabilized temporally at each position. Thus, it is possible to satisfactorily control the uniform thickness of the coating liquid. Also, the groove surfaces 11a, 11
Since the separation of the coating liquid on the b, 12a, and 12b is improved, it is possible to prevent the coating liquid from adhering and solidifying on the groove surfaces 11a, 11b, 12a, and 12b.
11b, 12a, and 12b can be easily cleaned.

Further, each of the groove surfaces 11a, 11b, 12a,
Since 12b is polished along the flowing direction of the coating liquid, the flow of the coating liquid becomes smoother, and the discharge pressure can be further stabilized.

FIG. 3 shows another embodiment. In this embodiment, the first and second slots 11 and 12 are formed at the back edge 13 and the first and second doctor edges 14 and 15.
Are formed on the groove surfaces 11 a, 11 b, 12 a, 12 b and the pockets 20, 21. The coating film 23 is for smoothing the flow of the coating liquid, and is coated with diamond-like carbon (DLC) in this example. However, other coatings may be used. It is preferable to use a material that is not easily damaged by abrasion, corrosive abrasion by fatty acids or sulfur-containing organic substances, and the like.

As described above, the first and second slots 1 of the back edge 13, the first and second doctor edges 14 and 15,
Grooves 11a, 11b, 12a, 12 forming grooves 1, 12
When the coating films 23 are respectively formed on b, the flow of the coating liquid becomes smooth and the discharge pressure can be uniformly stabilized, so that substantially the same effects as in the above-described embodiment can be obtained.

In each of the above-described embodiments, an example in which the present invention is applied to a coating apparatus for applying a two-layer coating liquid is shown. A similar effect can be obtained.

[0021]

As described above, according to the present invention, the groove surface forming the slot of the member is polished and formed to a desired surface roughness so as to reduce the friction coefficient with respect to the coating liquid. The discharge pressure can be spatially and temporally stabilized. Even when the length of the slot through which the coating liquid flows becomes longer, it is possible to satisfactorily control the uniform thickness of the coating liquid.

Further, according to the present invention, since the groove surface forming the slot is polished along the flow direction of the coating liquid or provided with a coating film for reducing friction, the flow of the coating liquid is further increased. As a result, the discharge pressure can be further stabilized.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a coating apparatus according to the present invention.

FIG. 2 is a perspective view showing a first doctor edge.

FIG. 3 is a sectional view of a main part showing another embodiment of the coating apparatus according to the present invention.

FIG. 4 is an explanatory diagram showing one configuration example of a conventional coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Application head 11, 12 ... Slot 13 ... Back edge 14 ... 1st doctor edge 15 ... 2nd doctor edge 16 ... Back edge tip 17 ... 1st doctor edge tip 18 ... 2nd doctor edge tip 11a, 11b, 12a, 12b ... groove surface 20, 21 ... pocket 23 ... coating film

Claims (3)

[Claims] 1. A coating head for applying a coating liquid on a flexible belt-like support running in one direction, wherein the coating heads are sequentially arranged in the running direction of the flexible belt-like support. A coating device having at least two members, wherein a slot is formed between the members to allow the coating liquid to flow toward the flexible belt-like support member, wherein a groove forming the slot of the member is provided. A coating apparatus characterized in that a surface is polished to a desired surface roughness so as to reduce friction with the coating liquid. 2. The method according to claim 1, wherein the groove surface is polished along a flowing direction of the coating liquid.
The coating device according to the above. 3. The coating apparatus according to claim 1, wherein a coating film for reducing friction with the coating liquid is formed on the groove surface.