JP4663073B2 - Die head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die head that applies a coating liquid to a substrate, and more particularly to a die head that can reliably prevent the coating liquid from becoming thicker at the start of application.
[0002]
[Prior art]
Conventionally, what has a pair of type | mold which forms a discharge outlet is known as a die head which apply | coats a coating liquid with respect to a board | substrate.
[0003]
As shown in FIG. 6A, the die head 10 has one mold 11 and the other mold 12, and a discharge port 18 is formed between the one mold 11 and the other mold 12. . When the coating liquid 30 is applied to the substrate W with such a die head 10, the initial bead of the coating liquid 30 becomes large at the start of application, and thus the film thickness of the coating liquid increases immediately after the start of application. May end up.
[0004]
In order to prevent such an increase in coating film thickness, the width of the tip of one mold 11 and the tip of the other mold 12 is reduced as shown in FIG. It is considered to reduce the gap between the substrate 10 and the substrate W.
[0005]
[Problems to be solved by the invention]
However, when the width of the tip of one mold 11 and the tip of the other mold 12 is reduced in order to prevent an increase in the film thickness of the coating liquid, the tips of both molds 11 and 12 are not processed by metal burrs. In some cases, the metal burrs may cause coating streaks.
[0006]
Further, even if the gap between the die head 10 and the substrate W is reduced, coating stripes and coating unevenness may be caused. In any case, it is difficult to reduce the size of the bead immediately after the start of coating.
[0007]
The present invention has been made in consideration of the above points, and can shorten the initial bead formation time and reduce the size at the start of coating, thereby reliably suppressing the thickening of the coating liquid. An object of the present invention is to provide a die head that can be used.
[0008]
[Means for Solving the Problems]
The present invention includes one mold and the other mold which is fitted to the one mold and forms a discharge port for discharging the coating liquid downward with respect to the flat substrate between the one mold and the mold. The discharge port formed between the pair of molds and the other mold is orthogonal to the flat substrate, and the tip of one mold protrudes from the tip of the other mold toward the substrate. It is formed and the liquid reservoir of coating liquid formed between one type of tip and other types of tip, and the other type of tip coating solution is formed such that the cross-section an acute angle A die head characterized in that an initial bead is formed .
[0009]
According to the present invention, by providing a protrusion protruding from the other mold at the tip of one mold, the coating liquid is provided between the tip of one mold and the tip of the other mold by the protrusion. A liquid reservoir can be formed. For this reason, a comparatively small initial bead can be rapidly formed in the liquid reservoir only by supplying a small amount of coating liquid from the discharge port to the liquid reservoir.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of a die head according to the present invention.
[0011]
As shown in FIG. 1, the die head 10 includes one mold 11 and the other mold 12 that is fitted to the one mold 11 and forms a discharge port 18 between the one mold 11. The coating liquid 30 is guided to the discharge port 18 from a passage 15 provided between the first mold 12 and the other mold 12, and is discharged to the substrate W.
[0012]
Of these, one mold 11 is a downstream mold, and the other mold 12 is an upstream mold. Further, the tip of one mold 11 protrudes toward the substrate W by the other mold to form a protrusion 11a, and this protrusion 11a causes a gap between the tip of one mold 11 and the tip of the other mold 12. A liquid reservoir 13 of the coating liquid 30 is formed.
[0013]
In this way, by projecting the tip of one mold 11 by a level difference H with respect to the tip of the other mold 12 to form a projecting portion 11a, the initial bead 30a at the start of coating can be made into a small amount of coating liquid 30. Thus, the initial bead 30a can be reduced in size.
[0014]
That is, as shown in FIGS. 2A and 2B and FIG. 3A, the tip of one mold 11 is projected by a step H from the tip of the other mold 12 to form a protrusion 11a. And the liquid reservoir 13 which uses the protrusion part 11a as a wall surface between the front-end | tip part of the one type | mold 11 and the front-end | tip part of the other type | mold 12 by the front-end | tip part 11a formed in this way can be formed. For this reason, when supplying the coating liquid 30 to the liquid reservoir 13 at the start of application, the coating liquid 30 spreads rapidly along the liquid reservoir 13 even with a small amount of the coating liquid 30. Thereby, the initial bead 30a of the coating liquid can be reliably formed in the liquid reservoir 13 in a short time. Moreover, since the initial bead 30a can be formed with a small amount of the coating liquid 30, it is possible to reduce the size of the initial bead 30a and prevent the coating liquid 30 from being thickened at the start of coating.
[0015]
Here, FIG. 2 (a) is a diagram showing a die head according to the present invention, FIG. 2 (b) is an enlarged view of part B of FIG. 2 (a), and FIG. 2 (c) is a diagram showing a die head of a comparative example. FIG. 2 (d) is an enlarged view of a portion D in FIG. 2 (c).
[0016]
3A is a perspective view of a die head according to the present invention, and FIG. 3B is a view showing a comparative example.
[0017]
On the other hand, as shown in FIGS. 2C, 2D and 3B, in the comparative example in which no step is provided between the tip of one mold 11 and the tip of the other mold 12, Since the tip of the mold 11 and the tip of the other mold 12 are flat, a relatively large amount is required to form the initial bead 30a with the tip of the one mold 11 and the tip of the other mold 12. Therefore, it is difficult to downsize the initial bead 30a.
[0018]
4A and 4B, of one mold 11 and the other mold 12, the inner wall of the passage 15, the surface on the discharge port 18 side of the protrusion 11a of the one mold 11, and the protrusion A surface treatment for improving the wettability is performed on the tip side surface of 11a and the tip side surface of the other mold 12. On the other hand, the inclined outer surface 11b of one mold 11 and the inclined outer surface 12b of the other mold 12 are subjected to surface treatment for improving water repellent properties.
[0019]
4A is a side sectional view of the die head 10, and FIG. 4B is an enlarged view of FIG. 4A. As described above, the surface treatment for increasing the water repellent property is performed on each of the inclined outer surfaces 11b and 12b of the one mold 11 and the other mold 12, and the surface treatment for increasing the wettability is performed on the other portions. Does not go around the inclined outer surfaces 11b and 12b, and the initial bead 30a can be more reliably downsized.
[0020]
Next, the operation of the present embodiment having such a configuration will be described.
[0021]
1 to 4, the tip of one die 11 of the die head 10 is protruded by a step H from the tip of the other die 12 to form a protrusion 11a, and the protrusion 11a is used to collect a coating liquid. 13 is formed, the initial bead 30a can be reliably formed with a small amount of the coating liquid 30.
[0022]
Next, by causing the substrate W to travel with respect to the die head 10, the coating liquid 30 can be applied onto the substrate W with high accuracy. In this case, since the initial bead 30a can be reduced in size, the film thickness of the coating liquid 30 does not become abnormally thick, and the film thickness can be made uniform.
[0023]
Next, a modified example of the present invention will be described with reference to FIGS.
[0024]
The modification shown in FIGS. 5A and 5B is such that the tip of the other mold 12 of the die head 10 is formed to have an acute angle without flattening, and the other is shown in FIGS. This is substantially the same as the embodiment shown in FIG.
[0025]
Compared to the case where the tip of the other mold 12 is formed with an acute cross section (FIG. 5 (a)) and the tip of the other mold 12 is formed flat (FIG. 5 (b)). The initial bead 30 a can be reliably formed using a small amount of the coating liquid 30. For this reason, it is possible to apply the coating liquid having a uniform film thickness to the substrate W while keeping the film thickness of the coating liquid thin.
[0026]
【The invention's effect】
As described above, according to the present invention, by providing a protrusion at the tip of one mold, a liquid pool is formed between the tip of one mold and the tip of the other mold by the protrusion. be able to. For this reason, a small initial bead can be formed only by supplying a relatively small amount of coating liquid to the liquid reservoir. Thereby, it is possible to make the film thickness uniform without abnormally increasing the film thickness of the coating liquid formed on the substrate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a die head according to the present invention.
FIG. 2 is a view showing the function and effect of the die head according to the present invention.
FIG. 3 is a perspective view showing a die head according to the present invention.
FIG. 4 is a view showing a surface treatment state of a die head according to the present invention.
FIG. 5 is a view showing a modification of the die head according to the present invention.
FIG. 6 is a view showing a conventional die head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Die head 11 One type | mold 11a Protruding part 11b Inclined outer surface 12 The other type | mold 12b Inclined outer surface 13 Liquid reservoir 15 Passage 18 Discharge port 30 Coating liquid 30a Initial bead W Substrate

Claims (2)

One mold and
A pair of molds and the other mold that are fitted to one mold and that form a discharge port that discharges the coating liquid downward with respect to the flat substrate between the molds. The discharge ports formed between are orthogonal to the flat substrate,
The tip of one mold protrudes from the tip of the other mold toward the substrate to form a protrusion, and a liquid pool of coating liquid is provided between the tip of one mold and the tip of the other mold. Forming,
The die head is characterized in that the tip of the other mold is formed with an acute cross section and an initial bead is formed using a coating liquid .   2. The die head according to claim 1, wherein a surface treatment for improving wettability is applied to at least a discharge port side surface of the protrusion of one mold.

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