JPH0753257B2 - Flat plate coater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flat plate coater used for applying a coating liquid to a flat plate such as a glass plate.

[Conventional technology]

Conventionally, a flat plate coater for applying a coating liquid to a relatively thick flat plate such as a glass plate is provided with a horizontal table on which the flat plate is placed and a blade movable above the flat plate along the flat plate. By placing it on the table and positioning the blade at the end of the flat plate, the coating liquid is poured on the upper surface of the flat plate in front of the moving direction of the blade, and then the blade is moved with a certain clearance with respect to the flat plate. It is known to scrape off excess coating liquid to obtain a predetermined coating film.

[Problems to be Solved by the Invention]

However, in such a conventional configuration, when the coating liquid flowing toward the front in the moving direction of the blade has a certain degree of fluidity, it spills from both ends of the blade during the coating operation while advancing the blade. Therefore, if the size of the object to be coated in the coating direction is large (for example, about 500 mm), there is a difference in the thickness of the coating immediately after the coating starts and at the end, and in the worst case, the coating liquid is insufficient. was there. In addition, if the coating liquid is expensive, it is economically very bad. Further, when the flow of the coating liquid accumulated in the front of the moving direction of the blade is very bad, for example, in the case of slurry liquid, there is a drawback that the coating becomes uneven.

The present invention has been made to solve the above-mentioned conventional drawbacks, and is a flat plate coater capable of applying a coating solution to a uniform film thickness in the moving direction of a blade and reducing the consumption of the coating solution. The purpose is to provide.

[Means for Solving the Problems]

As a result of various studies to solve the above-mentioned drawbacks of the prior art, a pair of pieces are provided at both ends of the blade so as to contact or contact the blade and the flat plate surface on the front side of the blade. It is possible to prevent spillage of the coating liquid, and by using a piece provided at both ends of the blade, a flat plate is provided on the front side in the moving direction of the blade at a distance from the blade, so that the coating liquid The inventors have completed the present invention, finding that it is possible to prevent leakage to the front in the blade movement direction and solve the conventional drawbacks.

That is, according to the present invention, a table on which a flat plate to be coated with a coating solution is placed, a movable table that can travel along the table, and a movable table that is held by the movable table and can travel on a flat plate on the table along the flat plate. A blade for controlling the coating film thickness and both ends of the blade are provided so as to come into contact with or come close to the blade and the flat plate on the front side in the moving direction of the blade at the time of coating, and the coating supplied in front of the blade. A pair of pieces for blocking the flow of liquid toward the outer side of the blade, and a diagonally arranged front end in the moving direction of the blade with a gap from the blade and a lower end approaching the blade side, A gist of a flat plate coater having a flat plate attached to a pair of pieces.

[Action]

In the flat plate coater according to the invention of the present application, when the coating liquid is supplied on the flat plate, which is the object to be coated placed on the mounting table, in front of the blade and the moving table is moved, the blade for controlling the coating film thickness is provided. While scraping off the excess coating liquid on the flat plate,
It runs along a flat plate and forms a coating film on the flat plate.

At this time, the pieces arranged at both ends of the blade prevent the coating liquid supplied in front of the blade from flowing out toward the outside of the blade. Therefore, during the movement of the blade, the coating liquid in front of the blade does not spill from both ends of the blade, the liquid is not run out until the end of the coating, and the coating surface with reduced unevenness of coating can be obtained.

Here, it is preferable that the bridges arranged at both ends of the blade are movable in the longitudinal direction of the blade. According to this structure, the width of the piece mounting position can be changed according to the size of the object to be coated.

Further, the flat plate provided on the front side of the blade by utilizing the pieces on both sides of the blade prevents the coating liquid supplied on the front side of the blade from flowing forward in the blade moving direction.
Since this flat plate is arranged obliquely so that the lower end approaches the blade side, a sufficient amount of coating liquid can be applied to the blade while reducing the contact area between the coating liquid supplied in front of the blade and the flat plate. , The space surrounded by the flat plate and the pieces on both sides can be filled, and the coating unevenness and the uniformity of the coating film thickness can be improved. If the contact area between the coating solution supplied in front of the blade and the flat plate is large, the coating solution in front of the blade may partially settle there before coating while the film thickness is regulated by the blade. However, even if it is concentrated and then the blade is used to regulate the required film thickness, coating unevenness remains. That is, even if it is intended that the coating be applied in a non-dried state to have a uniform thickness, the concentration of the solid content is partially different and uneven coating can occur during drying. In the present invention, since the flat plate is obliquely arranged as described above, the contact area of the coating liquid with the flat plate is reduced, and such coating unevenness can be prevented. Further, by arranging the flat plate at an angle, it is possible to smoothly move when moving on the flat plate during coating and prevent damage to the flat plate surface.

Here, it is preferable that rubber, a Teflon sheet, or the like is attached to the lower end of the flat plate so that the rubber, the Teflon sheet, or the like contacts the flat plate. With this configuration, liquid leakage between the flat plate and the flat plate can be further reduced, and damage to the coated surface by the flat plate can be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a perspective view of a main portion thereof, and FIG. 3 is a sectional view taken along the line AA of FIG. In the figure, 1 is a flat plate to be coated with the coating liquid, 2
Is a table on which the flat plate is placed, 3 is rails arranged on both sides of the table 2, and 4 is a movable table which is movably held on the rail 3 via linear bearings. It is configured to run.
Reference numeral 5 denotes guide rods attached to the movable table 4 on both sides of the table 2 and is substantially perpendicular to the upper surface of the table 2 and thus to the flat plate 1. Reference numeral 6 denotes a mounting base whose both ends are movably held by guide rods 5 on both sides via linear bearings, and 7 is a blade for controlling a coating film thickness, which is mounted on a lower surface thereof by a bolt 8 for controlling an upper surface of the mounting table 2. The plate 1 has a length that extends over almost the entire width. This blade 7 can move along the flat plate 1 on the flat plate 1 on the stand 2 by the movement of the moving base 4. As the blade 7, a cylindrical blade is used in this embodiment.

A pair of pieces 9 for regulating the coating liquid are arranged at both ends of the blade 7 and are detachably attached to the blade mounting base 6 by means of piece fastening bolts 10. This piece 9 extends to the lower end of the blade 7 on the front side in the moving direction of the blade at the time of coating, and as shown in FIG. 4, it is parallel to the arc surface 9A contacting the outer surface of the lower portion of the blade 7 and the flat plate 1. It has a lower end surface 9B, and as shown in FIG.
The arc surface 9A of the bridge 9 is mounted on the blade 7
, The lower end surface 9B contacts the upper surface of the flat plate 1, and the blade 7
It is possible to prevent the coating liquid 11 supplied to the front side of the blade from flowing outward at both ends of the blade. The arcuate surface 9A and the lower end surface 9B of the piece 9 need not necessarily be in close contact with the blade 7 and the flat plate 1, but may be in a state of being close to the blade 7 and the flat plate 1 so as to prevent liquid leakage. The piece 9 is attached at a position outside the coating portion on the flat plate 1 where it can come into contact with the flat plate without hindering the coating. Loosen the bolt 10 for tightening the piece and move along the blade mounting base 6. By moving it, it can be adjusted according to the size of the flat plate and the coating width.

In FIGS. 1 to 3, a blade 7 is provided on the front side in the moving direction with a proper interval with respect to the blade 7, and a lower end is lightly contacted with the upper surface of the flat plate 1 to regulate the coating liquid. A flat plate 12 is provided. This flat plate 12
Is a pair of pieces 9 whose both ends are provided at both ends of the blade 7.
Installed on. That is, the piece 9 has diagonal cuts 9C (see FIG. 4) on the opposite sides.
Slide both ends of the flat plate 12 into 9C, apply inward force to each piece 9, and tighten the flat plate.
Holding 12 Since the flat plate 12 is attached to the diagonal cut 9C of the piece 9 in this way, the flat plate 12 is diagonally arranged so that the lower end approaches the side of the blade 7, and as can be seen from FIG. It is possible to collect a sufficient amount of the coating liquid between the blade 7 and the flat plate 12 while reducing the contact area between the coating liquid 11 and the flat plate 1 between the flat plate 1 and the flat plate 12. In this configuration, the solid content is settled or concentrated by the blade 7 before the coating liquid 11 in front of the blade 7 has its film thickness regulated by the blade 7.
It is possible to reduce the adhesion to the surface of the coating, improve the coating unevenness, and improve the uniformity of the coating thickness.

Here, the flat plate 12 needs to have a length corresponding to a desired coating width, and therefore, it is necessary to prepare a plate having a length corresponding to various coating widths. 5 and 6 show an example of the flat plate 12, in which a sheet 12C of rubber, Teflon or the like is attached to the lower end of the main body 12A by an attachment piece 12B. When this flat plate 12 is used, the sheet 12C made of rubber, Teflon, or the like comes into contact with the flat plate 1, and the flat plate 1 is not damaged while the liquid leakage is well prevented.

Although not shown in FIGS. 1 and 2, a thin film gauge of a predetermined thickness is attached so as to wind the lower surfaces of both ends of the blade 7, and when the blade 7 is lowered onto the flat plate 1, The thin film gauge contacts the upper surface of the flat plate 1, and the blade 7
A predetermined clearance equal to the thickness of the thin film gauge is formed between the flat plate 1 and the flat plate 1. Instead of forming a desired clearance between the blade 7 and the flat plate 1 by using the thin film gauge in this way, another means (for example, a projection having a height equal to the desired clearance is integrally formed on the lower surfaces of both ends of the blade 7). It is also possible to form a desired clearance by providing the above).

In FIG. 1, reference numeral 13 denotes a support rod fixed to the blade mounting base 6, penetrating the top plate 4A of the moving base 4 to extend upward, and an operating lever 15 is attached to the tip end thereof via a pin 14. . By rotating the operating lever 15 from the horizontal position shown in the drawing to the vertical position and pressing the tip 15 against the top surface of the top plate 4A, the blade mounting base 6 and the blade 7 can be lifted. You can return 7 to its original position. This operation is performed when the flat plate 1 is replaced and the blade 7
It is very convenient when cleaning.

Next, the coating operation by the flat plate coater having the above configuration will be described.

The flat plate 1 to be coated with the coating liquid is set on the stand 2, and then the blade 7 is lowered onto the upper end of the flat plate 1. Then, since the thin film gauges (not shown) are attached to both ends of the blade 7 as described above, the blade 7 and the flat plate 1
A clearance corresponding to the set film thickness to be applied is formed between and.

Next, loosen the bolt 11 for tightening the piece, move the piece 9 to a position corresponding to the desired coating width, and insert the flat plate 12 into the groove 9C of the piece 9.
Slide in, insert with piece 9, and lower end surface of piece 9
While 9B is in light contact with the upper surface of the flat plate 1, tighten the piece tightening bolt 10 to fix the piece 9. As a result, a space surrounded by the blade 7, the piece 9, and the flat plate 12 is formed on the front side of the blade 7 over a desired coating width.

The coating liquid 11 is supplied into this space (see FIG. 3). Next, the movable table 4 moves to move the blade 7 in the direction indicated by the arrow in FIGS. 2 and 3. As a result, the blade 7 moves while regulating the coating liquid to a film thickness according to the clearance between the blade 7 and the flat plate 1, and a coating film having a desired thickness is formed on the flat plate 1. During this movement, the coating liquid 11 supplied in front of the blade 7 tends to be pushed forward by the blade 7 and flow to both sides at that time. To prevent outflow. Also, a flat plate provided in front of the blade 7
12 prevents the coating liquid 11 from flowing out in front of the blade. As a result, most of the supplied coating liquid is effectively used, wasteful consumption is prevented, and liquid shortage during the coating operation is prevented. In addition, the uniformity of the coating film thickness is improved. Furthermore, since the flat plate 12 is arranged diagonally, the flat plate 12 can move smoothly on the upper surface of the flat plate 1,
It is possible to prevent damage to the flat surface. As mentioned above,
If a flat plate 12 having a sheet 12C made of rubber, Teflon, etc. at the lower end as shown in FIGS. 5 and 6 is used, the effect of preventing the leakage of the coating liquid is great and the surface of the flat plate 1 may be damaged. The effect is obtained.

FIG. 7 is a graph showing data obtained by measuring the coating amount distribution of a coating layer coated by the flat plate coater of the embodiment shown in FIGS. 1 to 6 and a flat plate coater not using a bridge and a flat plate, The vertical axis is the coating amount (mg / cm ² ), and the horizontal axis is the distance from the start of coating (blade movement distance) (mm)
Is shown. Here, the coating width is about 270 mm. The data (a) in the figure is the data when the flat plate coater of the above-mentioned example is used and coated in the state shown in FIG. 3, and the data (b) is for comparison, the piece and the flat plate are removed, and 11 shows the data when coated in the state shown in FIG. As is clear from FIG. 7, in the data (b), the coating amount greatly decreases as the distance from the beginning of coating increases (change in coating amount, about 25.5%). In (a), the decrease in coat amount is slight (change in coat amount, about 2.7%), and the uniformity of coat amount is greatly improved. This shows that the present invention is superior in the uniformity of the coat amount.

Although the blade 7 having a cylindrical cross section is used in the above embodiment, the cross sectional shape of the blade 7 is not limited to this, and
As shown in Fig. 9, Fig. 10 and Fig. 10, it can be used in any shape such as trapezoidal shape, cattle nose shape, triangular shape, etc. depending on the suitability of the application liquid.

〔The invention's effect〕

As is clear from the above description, in the present invention, the blades for controlling the coating film thickness are provided with the pieces at both ends and the flat plate is provided on the front side, so that the blades are outwardly directed toward both ends of the blade during coating. It is possible to prevent the coating liquid from flowing out and to the front in the blade moving direction.
It is possible to suppress the wasteful consumption of the coating liquid and to improve the uniformity of the coating film thickness.

Further, since the flat plate is obliquely arranged so that the lower end thereof approaches the blade side, the contact area between the coating liquid supplied between the blade and the flat plate and the flat plate can be made small, but it is sufficient. Since it is possible to supply a large amount of coating liquid, it is possible to further improve the coating unevenness and to make the coating film thickness more uniform.

[Brief description of drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention, FIG. 2 is a perspective view of essential parts, FIG. 3 is a sectional view taken along the line AA of FIG. 1, and FIG. 5 is an end view of the flat plate 12, FIG. 6 is a perspective view of a part of the flat plate 12, and FIG. 7 is coating performed by the apparatus of the above embodiment. A graph showing the experimental results and the coating experimental results obtained by removing the bridge and the flat plate from the apparatus,
FIG. 8 is a sectional view of the same portion as FIG. 3 showing another embodiment of the present invention, FIGS. 9 and 10 are sectional views showing a modified example of the blade 7, and FIG. 11 is a sectional view of FIG. FIG. 4 is a cross-sectional view of the same portion as FIG. 3 showing a state in which a piece and a flat plate are removed by the device to perform coating. 1 …… Plate, 2 …… Stand, 3 …… Rail, 4 …… Movement, 5 ……
Guide rod, 6 …… Blade mount, 7 …… Blade, 8 …… Bolt, 9 …… Piece, 9A …… Arc surface, 9B …… Bottom surface, 9
C …… Incision, 10 …… Bolt for tightening pieces, 11 …… Coating liquid,
12 …… Flat plate, 12A …… Main body, 12B …… Mounting piece, 12C ……
Sheet.

Claims (1)

[Claims] 1. A table on which a flat plate to be coated with a coating liquid is placed,
A movable table that can run along the table, a blade that is held by the table and that can run on a flat plate on the table along the flat plate, and both ends of the blade,
It is provided so as to contact or approach the blade and the flat plate on the front side in the moving direction of the blade during coating,
A pair of pieces for blocking the flow of the coating liquid supplied to the front side of the blade toward the outer side of the blade, and a gap with respect to the blade on the front side in the moving direction of the blade so that the lower end approaches the blade side. A flat plate coater having a flat plate that is obliquely arranged on the plate and is attached to the pair of pieces.