JP2002018341A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device capable of easily and simply applying a coating liquid on a web and easily controlling the film thickness of the coating liquid. SOLUTION: The coating device is provided with a dip vessel 11 in which the web W enters and a 1st coating liquid 21 is housed, and a die head 16 provided at leased on one surface side of the web W coming out from the dip vessel 11 and for applying a 2nd coating liquid on the web W. A scraping roll 17 is provided through a supporting leg 17a at the upstream side of the die head 16. The 1st coating liquid on one side surface of the web W is scraped by the scraping roll 17 to be controlled to have a prescribed thickness. The 2nd coating liquid 22 is applied on the 1st coating liquid 21 to have a prescribed thickness by the die head 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a coating liquid to a web made of paper or metal.
In particular, the present invention relates to a coating apparatus capable of easily adjusting the thickness of a coating liquid applied to a web.

[0002]

2. Description of the Related Art As a method of applying a coating liquid to a web made of paper, metal, or the like, an apparatus having a dip tank containing a coating liquid applied to the web is known.

When the web enters the dipping tank, a coating liquid is applied to both sides of the web in the dipping tank.

[0004]

As described above, there is known a method in which a web is introduced into a dip tank and a coating liquid is applied to both sides of the web. Such a coating method can easily apply the coating liquid, but it is difficult to accurately adjust the thickness of the coating liquid.

[0005] The present invention has been made in view of such a point, it is possible to easily and easily apply the coating liquid to the web, and it is possible to accurately adjust the thickness of the coating liquid. It is an object of the present invention to provide a coating device that can perform the coating.

[0006]

According to the present invention, there is provided a dip tank in which a web enters and a first coating liquid to be applied to the web is stored, and at least the web is provided downstream of the dip tank in the web running direction. And a die head for applying a second coating liquid to the web.

According to the present invention, the first coating liquid is applied to one surface side of the web by the dipping tank, and the second coating liquid is applied by the die head so as to overlap the first coating liquid. The thickness of the coating liquid applied on one side can be adjusted.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of a coating apparatus according to the present invention.

1 and 2, a coating apparatus includes a dip tank 11 in which a web W enters and a first coating liquid 21 to be applied to the web W is stored, and one surface of the web W exiting from the dip tank 11. And a die head 16 provided on the side for applying the second coating liquid 22 to the web W.

The web W is made of paper, plastic, or metal. The web W is guided by the guide rollers 12 and enters the dip tank 11, and is sent upward by the guide rollers 13 in the dip tank 11. It is supposed to be. The web W that has passed through the die head 16 is then sent to the dryer 15 and the first coating liquid 2 on the web W
The first and second coating liquids 22 are dried.

As described above, the die head 16 is located on the downstream side of the dip tank 11 in the web running direction. Further, near the upstream side of the die head 16 in the web running direction, the scraping mechanism including the scraping roll 17 is provided. ing. The scraping roll 17 is connected to the die head 16 via a support leg 17 a, and the first coating liquid 21 applied in the dipping tank 11.
Is scraped off from the web W.

The first coating liquid 21 and the second coating liquid 22
May be of the same type or of different types.

When the first coating liquid 21 and the second coating liquid 22 are of the same type, for example, PVA is used as the first coating liquid 21 and the second coating liquid 22. When the two are different, for example, PVA is used as the first coating liquid 21,
As the second coating liquid 22, for example, PVA having a different viscosity from that of the first coating liquid is used.

Next, the operation of the present embodiment having the above configuration will be described.

First, the web W enters the dipping tank 11, and the first coating liquid 21 is applied to both surfaces of the web W in the dipping tank 11. First in the dip tank 11
The method of applying the coating liquid 21 is a so-called “dip pickling” method, which can be easily applied on the web W, but a large variation occurs in the film thickness of the first coating liquid.

Next, a scraping roll 17 is pressed against one surface of the web W which has exited the dip tank 11,
Thereby, the film thickness of the first coating liquid 21 on one side of the web W is adjusted to a desired value.

Next, the die head 1 is further coated on the first coating liquid 21 coated on one side of the web W and having a controlled film thickness.
From 6 the second coating liquid 22 is applied. Since the die head 16 can apply the second coating liquid 22 with a desired film thickness with relatively high accuracy, the first coating liquid 21 having the desired film thickness and the second coating liquid having the desired film thickness are coated on one surface of the web W. The liquid 22 can be applied in layers.

Thereafter, the web W is sent to the dryer 15, and the first coating liquid 21 and the second coating liquid 22 applied to one surface of the web W and the first coating liquid applied to the other surface of the web W. Liquid 2
1 is dried.

As described above, according to the present embodiment, the first coating liquid 21 applied by the dip tank 11 is scraped off by the scraping roll 17, and the second coating liquid 21 is further removed by the die head 16.
By applying the coating liquid 22, the first coating liquid 21 and the second coating liquid 22 having a desired film thickness can be applied on one surface side of the web W in an overlapping manner. Also, by scraping the first coating liquid 21 on one side of the web W with the scraping roll 17,
The web W can be run stably, and the coating operation of the second coating liquid 22 by the die head 16 can be performed stably. Further, it is easy to adjust the film thickness of the entire coating liquids 21 and 22 including the first coating liquid 21 and the second coating liquid 22.

Next, another embodiment of the present invention will be described with reference to FIG.

The embodiment shown in FIG.
On the both sides of the web W, the second coating liquid 22
Are provided, and supporting legs 17a, near the upstream side of the die heads 16, 26 are provided.
The scraping rolls 17 and 27 are provided via a 27a, and the rest is substantially the same as the embodiment shown in FIG. 1 and FIG.

As shown in FIG. 3, the first coating liquid 21 applied by the dip tank 11 is scraped off by the scraping rolls 17 and 27, and the second coating liquid 22 is applied by the die heads 16 and 26. Thereby, the first coating liquid 21 and the second coating liquid 22 having a desired film thickness can be applied on both sides of the web W in a superimposed manner. Further, the web W can be run stably by sandwiching the web W from both sides by the scraping rolls 17 and 27, and the coating operation of the second coating liquid by the die heads 16 and 26 can be performed more stably. Can be.

[0023]

As described above, according to the present invention, the coating liquid can be easily and easily applied to the web, and the thickness of the coating liquid can be adjusted accurately and easily. it can.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram showing an embodiment of a coating apparatus according to the present invention.

FIG. 2 is an enlarged view showing a die head and a scraping roll.

FIG. 3 is a diagram showing another embodiment of the coating apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Dip tank 16, 26 Die head 17, 27 Scraping roll 21 1st coating liquid 22 2nd coating liquid

Continued on the front page (72) Inventor Eiji Aizawa 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 4F040 AA22 AC02 BA02 BA23 BA50 CA05 CA15 CA17 CC01 DA12 4F041 AA12 AB01 BA05 BA57 CA02 CA13 CA22 4F042 AA22 CC02 CC09 DD09

Claims (6)

[Claims] 1. A dipping tank in which a web enters and a first coating liquid applied to the web is stored; and a dipping tank is provided at least on one surface side of the web downstream of the dip tank in the web traveling direction. And a die head for applying a second coating liquid to the coating apparatus. 2. An upstream side of a die head in a web running direction,
The coating apparatus according to claim 1, further comprising a scraping mechanism for scraping the first coating liquid applied to the web. 3. The coating apparatus according to claim 2, wherein the die head and the scraping mechanism are provided on both sides of the web. 4. The coating apparatus according to claim 2, wherein the scraping mechanism comprises a scraping roll. 5. The coating liquid according to claim 1, wherein the first coating liquid in the dipping tank and the second coating liquid in the die head are the same.
5. The coating apparatus according to any one of claims 4 to 4. 6. The coating apparatus according to claim 1, wherein the first coating liquid in the dip tank is different from the second coating liquid in the die head.