JPH0533863U - Coating device - Google Patents

Abstract

(57) [Summary] [Purpose] For coating liquids that can finely adjust the coating amount with a relatively simple structure and that eliminates various problems associated with solvent volatilization of the coating liquid and is prone to aggregation. There is provided a coating device having a novel structure which can be suitably used for the above coating. [Structure] A porous pipe (1) having a large number of uniform pores penetrating to the internal space on its surface, a coating liquid tank (2), and a coating liquid contained in the coating liquid tank The circulation pipe (3) which is introduced from the side surface of the above and is led out from the other side surface, and a coating liquid supply pump (4) provided in the circulation pipe, and the porous pipe (1) is , Is in contact with the surface of the traveling seat (7) and is rotatably supported.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coating device for coating the surface of a running sheet with a coating liquid. The coating amount can be finely adjusted with a relatively simple structure, and the solvent of the coating liquid volatilizes. The present invention relates to a coating device having a novel structure which solves various problems and can be suitably used for coating a coating liquid or the like that easily aggregates.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, various types of structures have been known as a coating device for coating a surface of a traveling sheet with a coating liquid. FIG. 3 is an explanatory view of a two-roll reverse rotation kiss coater, which is an example of the coating device as described above. The two-roll reverse rotation kiss coater is configured by horizontally placing the applicator roll (11) and the metering roll (12) in an open container (10). Then, the coating liquid in the open container (10) picked up by the applicator roll (11) is weighed and smoothed by the counter-rotating metering roll (12), and the sheet (7) is applied by the applicator roll (11). It is designed to be applied to the surface. In FIG. 3, (13) is a cleaning doctor and (8) is a transport roll.

[0003]

[Problems to be solved by the device]

 However, in the above kiss coater, since the coating amount on the surface of the sheet (7) is performed by the applicator roll (11), the applicator roll (11) is an expensive roll that requires high surface finishing accuracy. Need to use. However, since the open container (10) is used because of the necessity of arranging two rolls, there is a change in the concentration of the coating liquid due to the volatilization of the solvent and an environmental problem. Furthermore, since it is difficult to install a circulation system, it is unsuitable for coating a coating liquid that easily aggregates. The present invention has been made in view of the above circumstances, and an object thereof is to provide a coating device having a novel structure in which the above-mentioned various problems of the kiss coater are solved all at once.

[0004]

[Means for Solving the Problems]

 That is, the gist of the present invention is to provide a porous pipe having a large number of uniform pores penetrating to the internal space on the surface, a coating liquid tank, and a coating liquid contained in the coating liquid tank. It mainly consists of a circulation line introduced from one side face and led out from the other side face, and a coating liquid supply pump provided in the circulation line, and the porous pipe contacts the surface of the running sheet. The coating apparatus is characterized in that it is rotatably supported in contact therewith.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of a coating apparatus according to the present invention, which is an example applied to a sheet traveling in a horizontal direction. FIG. 2 is a back surface explanatory view of a main part of the coating apparatus according to the present invention shown in FIG.

In the coating apparatus of the present invention, the coating on the surface of the sheet (7) is performed by the porous pipe (1). The porous pipe (1) has a large number of uniform pores penetrating to the internal space on its surface, and the pore diameter thereof is usually selected from the range of 1 to 100 μm. Further, the porous pipe (1) is made of a metal material and has an outer diameter of usually 2 to 100 mm and an inner diameter of usually 1 to 99 mm. Therefore, the wall thickness (the length of the through hole) is usually It is 0.5 to 5 mm. As such a porous pipe (1), for example, a stainless steel tube type filter or flat type cylindrical filter commercially available from Nippon Seisen Co., Ltd. can be preferably used.

In the coating apparatus of the present invention, the coating liquid is contained in the coating liquid tank (2), and the tank has a substantially sealed structure. Therefore, various problems associated with volatilization of the coating liquid solvent are solved. The porous pipe (1) and the coating liquid tank (2) are connected by a circulation conduit (3), and the coating liquid in the coating liquid tank (2) is connected by the circulation conduit (3). , Is introduced from one side surface of the porous pipe (1), is led out from the other side surface, and is circulated. The circulation of the coating liquid is performed by the coating liquid supply pump (4) provided in the circulation pipe line (3). Therefore, since the coating liquid is constantly circulated, there is no problem even if the coating liquid tends to agglomerate, and any coating liquid exhibiting thixotropic fluid characteristics from Newtonian fluid can be targeted. ..

The porous pipe (1) is in contact with the surface of the traveling seat (7) and is rotatably supported. The porous pipe (1) is supported by a rotary support (5) fitted in a liquid-tight state from both sides of the porous pipe (1).

In the coating apparatus of the present invention, the amount of coating on the surface of the sheet (7) depends on the hydraulic pressure in the porous pipe (1) and is discharged from the pores of the porous pipe (1). This is done by adjusting the liquid volume. The liquid pressure in the porous pipe (1) is adjusted, for example, by providing a bypass pipe (6) in the circulation pipe (3) and adjusting the amount of coating liquid introduced into the porous pipe (1). By doing so, it can be easily performed. In addition, since the above-mentioned adjustment of the coating liquid amount can be performed with high accuracy, for example, in the coating liquid having Newtonian fluid characteristics, it is possible to control the film thickness on the order of 0.1 μm.

In the coating apparatus of the present invention, by adjusting the amount of the coating liquid introduced into the porous pipe (1), the total amount of the coating liquid discharged from the pores of the porous pipe (1) can be applied to the sheet. It can be applied to the surface of (7), but a saucer (9) can be placed below the porous pipe (1) to deal with unexpected dripping of the coating liquid.

In the above-mentioned embodiment, the coating apparatus of the present invention is applied to the sheet traveling in the horizontal direction. However, the coating apparatus of the present invention is also applicable to the sheet traveling in the vertical direction or the diagonal direction. Can be applied in exactly the same manner as above, and there is no restriction on the application position.

[0012]

[Effect of the device]

 According to the coating apparatus of the present invention described above, the following concrete results are mainly achieved. (1) The coating amount can be finely adjusted with a relatively simple structure. (2) Various problems associated with volatilization of the coating liquid solvent are eliminated. (3) It can be applied to coating liquids that easily aggregate and coating liquids that exhibit thixotropic fluid characteristics. (4) The restrictions on the coating position can be eliminated.

[Brief description of drawings]

FIG. 1 is a side view of a coating device according to the present invention.

FIG. 2 is a rear view of the essential parts of the coating apparatus according to the present invention shown in FIG.

FIG. 3 is an explanatory diagram of a two-roll reverse rotation kiss coater.

[Explanation of symbols]

 (1) Porous pipe (2) Coating liquid tank (3) Circulation pipeline (4) Coating fluid supply pump (5) Rotating support (6) Bypass pipeline (7) Sheet (8) Transport roll (9) Saucepan (10) Open container (11) Applicator roll (12) Metering roll (13) Cleaning doctor

Claims (1)

[Scope of utility model registration request] 1. A porous pipe having a large number of uniform pores penetrating to the inner space on the surface thereof, a coating liquid tank, and a coating liquid contained in the coating liquid tank is introduced from one side surface of the porous pipe. It is mainly composed of a circulation pipe line that is led out from the other side surface and a coating liquid supply pump provided in the circulation pipe line, and the porous pipe can be rotationally driven by contacting the surface of the traveling sheet. An applicator characterized by being supported by.