JPH0440767Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an apparatus for applying a coating liquid to a continuously running strip-shaped support (hereinafter referred to as "web"), and more specifically, an improved coating method. This relates to a rod for equipment.

[Conventional technology]

Conventionally, various devices have been proposed as devices for applying a coating liquid to a continuously running web. In general, the coating process includes a part that transfers the coating liquid onto the web (hereinafter referred to as the "application system") and a part that measures the coating liquid transferred to the web to a desired coating amount (hereinafter referred to as the "measuring system"). ), the coating methods were classified based on the differences in application type and metering type. Based on the differences in the application system,
There are known roller coating methods, dip coating methods, fountain coating methods, etc., as well as air knife coating methods, blade coating methods, rod coating methods, etc. based on differences in metering systems. Furthermore, extrusion coating methods, bead coating methods, and curtain coating methods are known as methods in which application and metering are performed in the same part.

Among these coating methods, the rod coating method transfers excess coating liquid onto the web and then scrapes off the excess coating liquid with a stationary or rotating rod to achieve the desired coating amount, and requires simple equipment. It is widely used because it has the characteristic of being able to apply a thin layer at high speed by operation. Although any method can be used as the application system in the rod coating method, the roller coating method, especially the kiss coating method, is most commonly used because of its simplicity.

However, in the conventional rod coating method, the application system and metering system were completely independent, so it was necessary to set conditions for each separately during coating, which was not only complicated but also required a large amount of space. However, it had the drawback of being uneconomical in terms of space usage.

In Japanese Patent Publication No. 52-36529, wire coating body, heat-resistant filler,
A coating method that mechanically creates a physical space using a thin guiding plate and forms a wedge-shaped liquid pool therein is exhibited. A coating method has been proposed in which the coating liquid is supplied so that a puddle is formed just before the application, and the coating liquid is applied by a rod.
It is used as an improved coating method that is easy to operate, does not require a large amount of space, and can form a coating film with excellent surface properties.

There are three types of rods for coating equipment used in the rod coating method: rod material with a smooth surface, rod material wrapped with wire, and rod material with grooves dug. However, in most cases, a rod for coating equipment is used, which is a rod material wrapped with wire.

Rods for coating equipment that are wound with wire have been used for hot melt coating and for coating relatively large amounts of coating.

The diameter of the wire used is 0.08 to 1.52 mm, and generally 0.08 to 0.64 mm.

The amount of coating can be changed depending on the thickness of this wire.

[Problem that the invention seeks to solve]

However, in the case of a conventional rod for a coating device that is wound with wire, the thickness of the coated layer may be uneven due to the wire diameter accuracy of the wire.

Wire is usually manufactured by die drawing so that the wire diameter is constant. However, due to changes in the die over time, etc., the wire diameters are not exactly the same. Even if this wire is wrapped tightly around a rod material, small differences in wire diameter will change the pitch at which the wire is wound. Furthermore, for the same reason as above, the finished outer diameter of the coating device rod around which the wire is wound varies depending on the location.

These differences in pitch and outer diameter affect the amount of coating liquid retained, resulting in uneven coating thickness after coating.

2. The softness of the wire material used to wrap the wire shortens the wear life of the wire.

To wrap the wire around the rod material,
The wire must have at least the flexibility to conform to the diameter of the rod material. If the wire is harder than this, the wire will break during winding, making it impossible to manufacture a rod for a coating device by winding the wire.

On the other hand, the wire material always comes into contact with the support to which it is applied, and friction is repeated between the wire material and the support.

In addition, the rod for coating equipment wrapped with wire is
Wire has the disadvantage that it has a short wear life because it has to be flexible enough to not break even when it is wound, so it cannot be hard enough.

The object of the present invention is to eliminate the above-mentioned drawbacks, provide a hard rod for coating equipment that has good wire diameter accuracy, does not cause uneven coating thickness, and has a long wear life.

[Means for solving problems]

The gist of the present invention is to manufacture a rod for coating equipment by rolling a rod of a single material that has the same shape as a conventional rod for coating equipment wound with wire, and to process the rod before rolling. The rod material has a surface hardness that is hard enough to be rolled.

That is, the present invention provides a rod for a coating device that comes into contact with a continuously running web to apply a coating liquid to the web, and a rod material having a surface hardness that is hard enough to allow the rod for the coating device to be rolled. The wire diameter is 0.3mm to 1.52mm on the surface of the rod material by rolling process without winding the wire on the surface.
This is a rod for a coating device, characterized in that the outer surface shape of the rod for a coating device is formed by winding a wire.

The fact that the rod material used in this invention has a surface hardness that is hard enough to be rolled means that it has a hardness that is suitable for rolling. H _RC =40 or less is preferred.

Surface hardening methods that provide this surface hardness include carburizing, nitriding, sulfurizing, and metal penetration methods as chemical surface hardening methods, and physical surface hardening methods such as induction baking, flame hardening, and welding. , metal spraying, electroplating, ion plating, etc.

Any method may be used as long as it can provide a surface hardness of H _RC =40 or less.

In the present invention, forming the surface of the rod material into the same shape as the outer surface shape of the rod for coating equipment around which the wire is wound by rolling means to perform side rolling using a rolling matrix.

[Effect]

In this invention, the rod for coating equipment uses a rod material with a surface hardness that is hard enough to be rolled, so even if the rod for coating equipment is used continuously for a long time, it will not wear out or be damaged by foreign objects. This increases the wear resistance life and reduces the risk of failure of the coated surface.

In addition, by forming the surface of the rod material into the same shape as the outer surface shape of the rod for coating equipment wrapped with wire through the rolling process, the error between the pitches of the rolling matrix and the difference in outer diameter can be reduced on average. Therefore, the so-called wire diameter accuracy is good, and uneven coating thickness does not occur.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a rod for a coating device according to the present invention during rolling processing, and FIG. 2 is a longitudinal sectional view of the rod for a coating device according to the present invention.

Example 1 In Figure 1, the rod material 1 has a diameter of 13.3 mm.
By pressing the rolling matrix 2 which forms the external shape of the rod for coating equipment, which is made of SUS304 with a diameter of A rod for a coating device of the present invention was produced by molding the surface of a rod material as shown in the vertical cross-sectional view into the same external shape as that of a rod for a coating device, which is made by winding a wire with a wire diameter of 0.3 mm similar to that of the comparative example below. was created.

When rod coating was performed using this rod for coating equipment, a coated product with no uneven coating thickness was obtained even after 120 hours of continuous coating.

Comparative Example 1 As shown in Fig. 3, SUS304 with a diameter of 12.7 mm was used as the rod 3, and a wire material 4 with a wire diameter of 0.3 mm was wound thereon, and a rod for coating equipment as shown in the vertical cross section of Fig. 4 was used. Produced. After 30 hours of continuous application, uneven coating thickness occurred.

[Effect of idea]

In the coating device rod of the present invention that contacts a continuously running web and applies a coating liquid to the web, the coating device rod is made of a rod material having a surface hardness that is hard enough to be rolled. The outer surface shape of a rod for coating equipment, which is made by winding wire with a wire diameter of 0.3 mm to 1.52 mm, is formed on the surface of the rod material by rolling processing without wrapping wire on the surface. The hard surface hardness of the rod for the machine equipment has a long wear-resistant life and reduces the risk of failure of the coated surface, and the rolling process averages out the pitch error and outer diameter difference of the matrix, improving the so-called wire diameter accuracy. Good coating quality was obtained with no unevenness in coating thickness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the manufacturing state of the coating device rod according to the present invention. FIG. 2 is a longitudinal sectional view of the rod for the coating device of the present invention. FIG. 3 is a perspective view of the manufacturing status of a conventional wire-wound rod, and FIG. 4 is a longitudinal sectional view of the conventional wire-wound rod. 1... Rod material, 2... Manufacturing matrix, 3... Rod material, 4... Wire material.

Claims (1)

[Scope of utility model registration request] In a rod for a coating device that comes into contact with a continuously running web and applies a coating liquid to the web, the rod for the coating device uses a rod material with a surface hardness that is hard enough to be rolled. A coating characterized in that the outer surface shape of a rod for coating equipment is formed by winding a wire with a wire diameter of 0.3 mm to 1.52 mm on the surface of the rod material by rolling processing without winding the wire. Rod for engineering equipment.