JP2002346463A - Sheet glass coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet glass coating device capable of providing a high precision coating film on a sheet glass by a die coating method, without moving such a conventional expensive, large sized and heavy unit, with a low-priced device. SOLUTION: The sheet glass coating device 100 is for applying a coating liquid to a sheet glass 13, and is equipped with a glass supply part 8 which supplies the sheet glass 13, a precision table with an air blowing-off hole which floats this sheet glass 13 with air, a block for receiving glass which limits rising and right and left positional displacement of the sheet glasses 13, a glass press-out block 5b with a glass feeding precision linear motor 5a which shifts the sheet glass 13 at a predetermines coating speed, a die head 1 which applys the coating liquid to the sheet glass 13, a coating liquid supply means which supplies the coating liquid, and a glass discharge part 9 which discharges the sheet glasses 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-plate coating apparatus for coating a sheet-like substrate, for example, a glass plate, and more particularly to a high-precision coating method for a large-sized glass plate such as a color filter for a liquid crystal display. The present invention relates to a veneer coating apparatus for forming a film.

[0002]

2. Description of the Related Art Conventionally, as a coating apparatus for a sheet-like glass plate, for example, a spin coating method in which a coating liquid is dropped on the center of a glass plate and a thin film is formed while rotating is known, and widely used for various products. Have been.

However, in recent years, for example, a glass plate or the like as a substrate of a color filter for a liquid crystal display requires a large amount of liquid to be dropped due to an increase in size thereof.
Accordingly, the amount of the film to be skipped and discarded increases, which is uneconomical, and the accuracy of the film thickness tends to decrease.

[0004] Therefore, as a coating method on a glass plate,
For example, vacuum suction on a precision table and hold it, and move the table while holding the glass plate,
There is a die coating method in which coating is performed on a glass plate by passing through a lower portion of a die head for performing coating. There is also a die coating method in which a die head unit located above a table holding the glass plate moves and passes over the table holding the glass plate to apply the liquid to the glass plate.

In order to realize precise coating by the above-mentioned die coating method, the distance (coating gap) between the glass plate to be coated and the die head for coating the coating liquid is constant and the coating speed is constant. Is an important requirement. However, in order to obtain a high-precision coating film with the conventional apparatus, a large, heavy precision table (platen) that holds the glass plate by vacuum suction as described above requires a large torque and a high level to drive it. A high-precision guide unit and a driving motor having high-precision driving are required, which makes the apparatus expensive.

In the case of a type in which a die head unit having the above-described die head mounted thereon moves, a so-called portal shape is required, and high pitch rigidity is required to suppress pitching and yawing of the unit. The capacity also increases. Further, in this method, the position of the drive system, the position of the guide portion, and the position of the center of gravity are often separated from each other, and the influence of pitching and yawing is more likely to occur as compared with the table moving type. In either method, it is guided by the guide part and moves, and it is necessary to keep the coating gap between the glass plate and the die head constant while moving, and the guide part is a precision air guide or a guide that has been subjected to scraping processing. It is very difficult to move a heavy object with high precision because of the use of a unit, and it becomes a more expensive device.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to move an expensive, large and heavy unit as in the prior art by a die coat method. It is an object of the present invention to provide a single-plate coating apparatus which can obtain a high-precision coating film on a glass plate without using any apparatus at a low cost.

[0008]

In order to achieve the above object, the present invention is directed to a single-plate coating apparatus for applying a coating solution to a sheet-like substrate, Supply means for supplying, substrate floating means for floating the substrate by air, substrate guide means for preventing the substrate from rising and shifting left and right, and substrate moving means for moving the substrate at a predetermined coating speed. A single-plate coating apparatus, comprising: a coating unit that applies a coating liquid to the substrate; a coating liquid supply unit that supplies a coating liquid to the coating unit; and a substrate discharging unit that discharges the substrate. It was done.

According to a second aspect of the present invention, there is provided the veneer coating apparatus according to the first aspect, wherein the substrate is a glass plate.

Further, in the invention according to claim 3, the substrate floating means floats the substrate by air of a precision table having a plurality of air blowing holes and has a plurality of air blowing holes. 3. The single-plate coating apparatus according to claim 1, wherein the single-plate coating apparatus is extruded by a motor and a substrate extruding block and is moved at a predetermined speed.

Further, in the invention according to claim 3, the single-plate coating apparatus according to any one of claims 1, 2 and 3, wherein the coating means is a die coating method using a die head.

According to the veneer coating apparatus of the present invention, the substrate is levitated by the air of the precision table having the air blowing holes, and only the levitated substrate is extruded by the substrate extrusion block with the precision linear motor and moved at a predetermined speed. The unit is expensive and large and heavy as in the past (die head unit or precision table (Joban with suction holes) unit)
A single-plate coating device can be provided which does not move the device and which can obtain a high-precision coating film on a glass plate with an inexpensive device.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the veneer coating apparatus of the present invention
As shown in the schematic side view of FIG. 1, for example, a single-plate applying apparatus (100) for applying a coating liquid to a sheet-like glass plate (13), and a supply means for supplying the sheet-like glass plate (13) Glass plate supply section (8) as the
A precision table (4) with air blowing holes as a substrate levitation means for floating 3) with air, and as shown in the schematic front view of FIG. As shown in FIG. 1, a glass plate receiving block (10a, 10b) as a substrate guide means, and a glass plate feed precision linear motor (5a) as a substrate moving means for moving the glass plate (13) at a predetermined coating speed. ) With a glass plate extrusion block (5b) and a glass plate (1
3) A die head (1) with a head vertical cylinder (3) as a coating means for coating the coating liquid, and a coating liquid supply pump (11) as a coating liquid supply means for supplying a coating liquid to the die head (1). ), A coating liquid tank (12), and a glass plate discharge section (9) as a substrate discharge means for discharging the applied glass plate (13). Although not shown, the glass plate supply unit (8) and the glass plate discharge unit (9) have a loader / unloader for supplying and discharging the glass plate.

Next, the basic application operation of each means will be described. First, as for the standby position of the present apparatus, as shown in the schematic side view of FIG. 3, the die head (1) moves upward and is at the standby position on the drying prevention unit (2). The glass plate pressurization holding block (6b) attached to the glass plate pressurization holding cylinder (6a) body is at the stroke end (retreat end), and the position where the glass plate (13) stops contacting there becomes the coating start position. . Further, the glass plate pressurization holding cylinder (6a) and the glass plate pressurization holding block (6b) have the function of moving up and down together with their units, and are in contact with the lowered position, that is, on the precision table (4) with air blowing holes. . In addition, precision linear motor (5
a) and the glass plate extruding block (5b) have a function of moving up and down together with the unit, and the glass plate (13) is placed at an elevated position, that is, below the glass plate extruding block (5b).
Is at a position through which the glass sheet extrusion block (5b) is located at the retracted end. Then, the glass plate (13) is placed on the glass plate supply section (8) composed of a plurality of rollers by hand or by a loader (not shown).

Next, as shown in the schematic side view of FIG. 4, the glass plate (13) is rotated by the rotation of the rollers of the glass plate supply section (8) so that the glass plate (13) is moved to the precision table (4) with air blowing holes.
Send it up. At this time, in the first half of the precision table with air outlets (4), air is blown out from the air outlets (4a) to float the glass plate (13).

Further, as shown in the schematic side view of FIG. 5, when the glass plate (13) passes under the glass plate extruding block (5b), the glass plate feeding precision linear motor (5) is used.
a) The attached glass plate extruding block (5b) descends together with its unit and starts pushing the glass plate (13).

Further, as shown in the schematic side view of FIG. 6, the glass plate (13) is fed by the glass plate extruding block (5b) until the glass plate (13) comes into contact with the glass plate extruding block (5b).

Subsequently, as shown in the schematic side view of FIG. 7, the die head (1) once rises and the drying prevention unit (2)
After retreating, the die head (1) descends to a position where the coating gap is set, supplies the coating liquid supplied from the coating liquid tank to the die head (1), and starts coating. At this time, the feeding speed of the glass plate (13) is based on the glass plate feeding precision linear motor (5a), and the coating speed is 20 to 12
It is about 0 mm / sec. In fact, a glass plate (1
3) Pressing the glass plate extruding block (5b) and the glass plate (13) in close contact with each other by the glass plate pressurizing holding cylinder (6a) and the glass plate pressurizing holding block (6b) in the direction opposite to the traveling direction. Apply a pressure of 2-10N.

Then, as shown in the schematic side view of FIG. 8, the glass plate (13) is fed in the above-described manner to the coating end position to perform coating.

As shown in the schematic side view of FIG. 9, at the coating end position, the coating liquid supply pump (not shown) stops, the die head (1) rises, and is stored in the drying prevention unit (2). Is done. Then, the glass plate pressurizing holding cylinder (6a) and the glass plate pressurizing holding block (6b) rise and retreat together with their units.

Further, as shown in the schematic side view of FIG. 10, the glass plate (13) is composed of a glass plate feeding precision linear motor (5a), a glass plate extruding block (5b), and rollers of a glass plate discharging section (9). The glass plate (13) is sent out to the glass plate discharge position by the rotation of. The above process is defined as one cycle of the application process.

[0022]

As described above, the present invention has the following effects. That is, according to the veneer coating apparatus of the present invention, a glass plate as a substrate is levitated by the air of a precision table with air blowing holes, and only the levitated glass plate is extruded by a glass plate extruding block with a precision linear motor to a predetermined value. It does not move expensive, large and heavy units (die head unit or precision table (Joban with suction holes) unit) as in the past. A single-plate coating device from which a coating film can be obtained can be provided.

Further, since the structure has a guide for limiting the upper surface of the glass plate, it is necessary to keep the coating gap constant in accordance with the amount of change in the thickness of the glass plate as in the conventional method. A mechanism for raising and lowering the die head and a measurement unit for measuring the glass plate thickness are not required. Therefore, the single-plate coating apparatus of the present invention, which has a simple structure and inexpensive components, can realize a low-cost, high-precision coating film.

Accordingly, the present invention has an excellent practical effect as a single-plate coating apparatus for forming a high-precision coating film on a sheet-like glass plate, particularly a glass plate which becomes large, such as a color filter for a liquid crystal display. Demonstrate.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a veneer coating apparatus according to the present invention in a side view.

FIG. 2 is an explanatory view showing an embodiment of the veneer coating apparatus of the present invention as viewed from the front.

FIG. 3 is an explanatory view showing an embodiment of an operation of a coating process of the veneer coating apparatus of the present invention in a side view.

FIG. 4 is an explanatory view showing another embodiment of another operation of the coating process of the veneer coating apparatus of the present invention in a side view.

FIG. 5 is an explanatory view showing another embodiment of another operation of the coating process of the veneer coating apparatus of the present invention in a side view.

FIG. 6 is an explanatory view showing another embodiment of another operation of the coating process of the single-plate coating device according to the present invention in a side view.

FIG. 7 is an explanatory view showing another embodiment of another operation of the coating process of the single-plate coating apparatus according to the present invention in a side view.

FIG. 8 is an explanatory view showing another embodiment of another operation of the coating process of the veneer coating apparatus of the present invention in a side view.

FIG. 9 is an explanatory view showing one embodiment of another operation of the coating process of the single-plate coating apparatus of the present invention in a side view.

FIG. 10 is an explanatory view showing another embodiment of another operation of the coating process of the veneer coating apparatus of the present invention in a side view.

[Explanation of symbols]

 1 Die head 2 Drying prevention unit 3 Head vertical cylinder 4 Precision table with air blowout hole 4a Air blowout hole 5a Glass plate feed precision linear motor 5b {Glass plate extrusion block 6a} Glass plate pressurization holding cylinder 6b {Glass plate pressurization holding block 7a} Coating gap adjustment linear actuator 17b {Coating gap adjustment linear actuator 2 8} Glass plate supply unit 9 Glass plate discharge unit 10a {Glass plate receiving block 1 10b} Glass plate receiving block 2 11} Coating liquid supply pump 12} Coating liquid tank 13} Glass plate 100} Single plate coating device

Claims (4)

[Claims] 1. A single-plate coating apparatus for applying a coating liquid to a sheet-like substrate, comprising: a supply unit for supplying the substrate; a substrate floating unit for floating the substrate by air; Substrate guide means for preventing left and right displacement, substrate moving means for moving the substrate at a predetermined coating speed, coating means for applying a coating liquid to the substrate, and a coating liquid supply for supplying the coating liquid to the coating means And a substrate discharging means for discharging the substrate. 2. The veneer coating apparatus according to claim 1, wherein said substrate is a glass plate. 3. The substrate floating means floats a substrate with air from a precision table having air blowing holes having a plurality of air blowing holes, and the substrate moving means moves the floating substrate by a precision linear motor and a substrate pushing block. 3. The single-plate coating apparatus according to claim 1, wherein the single-plate coating apparatus is extruded and moved at a predetermined speed. 4. The veneer coating apparatus according to claim 1, wherein said coating means is a die coating method using a die head.