JPH0433985Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating device. In particular, in the production of recording materials such as photographic light-sensitive materials such as photographic film and photographic paper, photosensitive printing plates, and magnetic recording materials such as magnetic recording tape, a continuously running long strip-shaped support (hereinafter referred to as "web") is used. This relates to a device for applying a coating liquid such as a photographic emulsion or a magnetic agent to a surface (.). More specifically, the present invention relates to an apparatus for coating a thin film of coating liquid by colliding it with a traveling belt-shaped support.

[Prior art]

Among the methods in which a thin film-like coating liquid is applied by colliding with a traveling belt-like support, a typical method is the curtain coating method.

The curtain coating method is a method in which a free-falling curtain made of one or more coating liquids is formed, and the curtain is collided with the object to be coated to form a coating film on the object. However, due to the demand for improved coating quality, high-precision coating is gradually required, and in recent years, it has been disclosed in Japanese Patent Publications No. 49-24133 and No. 49-35447. Attempts have also been made to apply curtain coating methods to fields that require particularly high precision, such as the production of photographic materials.

The method disclosed in Japanese Patent Publication Nos. 49-24133 and 49-35447 involves applying one or more types of coating liquid to two support members (hereinafter referred to as " The material is supplied between the edges (referred to as "edge guides") to form a thin film-like free-falling curtain, which is then applied to the continuously running web. The reason why the coating liquid is supplied between the two edge guides is to regulate the coating width and to stabilize the curtain film.

[Problems with conventional technology]

As described above, although many improvements have been made in curtain coating methods, no method has been invented in which curtain films are coated continuously on supports of different widths without cutting them.

Therefore, the coating width is fixed or semi-fixed, and if the width of the web changes, it is not possible to respond immediately, and it is necessary to use another coating device or temporarily stop the coating machine and change the edge guide spacing. It was hot.

Furthermore, no method has been invented for instantly moving a container that receives excess liquid in a portion wider than the width of the support to be coated in response to a change in the width of the web. Therefore, it is common practice to install a fixed surplus liquid collection container with a width that is equal to or slightly wider than the width of the liquid injector to which the coating liquid is supplied, below the part where the free-falling curtain collides with the web. can be,
It was necessary to take up a large space for the surplus liquid collection container.

[Problems that ideas should solve]

SUMMARY OF THE INVENTION An object of the present invention is to provide a curtain coating device that automatically changes coating width in response to changes in web width.

Another object of the present invention is to provide a curtain coating device that has a compact surplus liquid recovery mechanism and can change the coating width depending on the web width.

[Means to solve the problem]

The above-mentioned object of the present invention is to provide an apparatus for coating at least one kind of coating liquid in the form of a thin film flowing down between edge guides via an inclined plate by colliding with a traveling band-shaped support. a coating liquid collection container that is movable back and forth along the traveling direction of the support, and a collection container that receives excess liquid in a portion where the width of the thin film liquid is wider than the width of the support. This is achieved by a coating device characterized in that it is equipped with a gutter for transferring the liquid to the liquid.

Hereinafter, embodiments of the present invention will be described in more detail based on the accompanying drawings.

1 to 3, a fixed amount of coating liquid S is fed into the cavity 4 in the slide hopper 1 from a liquid tank (not shown) via a metering pump P. The coating liquid S flows out through the slot 3 whose width is narrower than the cavity 4, flows down the sliding inclined surface 6 of the slide hopper 1 as a flowing layer 8, and flows down the tip lip of the inclined plate (hereinafter referred to as (referred to as a "rip"). In the lip 7, a free falling curtain of the coating liquid S, that is, a thin coating liquid film 9 is formed. On the other hand, a strip-shaped support 11 is running from the original roll through a bath roller 2 in the direction of arrow A, and the thin film-shaped coating liquid 9 collides with the running strip-shaped support 11 to form a coating film 10. form.

As shown in FIGS. 1 and 2, two spaced vertical edge guides 20, 20' extend from the adjacent lip 7 just above the coating path. These edge guides promote the formation of a free-falling vertical curtain 9 and define its width as it impinges on the surface of the web 11.

In the embodiment shown in FIGS. 1 to 3, the support and guide mechanism of the present invention includes a track 12 and a running body 1.
3 and 13', and these traveling bodies can be moved in the width direction of the support body by a drive mechanism (not shown) composed of, for example, an electric motor, a speed reducer, and a feed screw. That is, edge guides 20, 20' are attached movably in the width direction of the web 11 from running bodies 13, 13' that can slide on a track 12 that is fixedly suspended from a frame (not shown) of the coating machine. ing. That is, when the web end detector detects a change in the width of the web 11, the electric motor rotates the feed screw in the forward and reverse directions via the reducer, respectively, so that the running bodies 13 and 13' slide on the track 12 in the width direction. The edge guides 20, 20' move and the coating width follows.

There are many other drive mechanisms, such as those that use a hydraulic cylinder and a slide guide mechanism, and those that use a pneumatic cylinder and a slide guide mechanism, and the present invention is not limited to a certain drive mechanism. Furthermore, various structures can be applied to the support and guide mechanism.

On the other hand, the width of the downstream layer 8 on the inclined plate is the width of the curtain film 9.
The excess liquid in the wide area relative to the width of the slide hopper is received in the excess liquid receiving and transferring troughs 14 and 14' provided between the inclined plate 6 and the support 11 at the part away from the tip lip 7 of the slide hopper. and the direction of flow can be changed.

The receiving and transferring gutter 14, 14' is connected to the edge guide 2.
0, 20', and as the edge guides 20, 20' move, the receiving and transferring gutter 14,
14' also moves at the same time. Surplus liquid receiving transfer gutter 14,
The surplus liquid received in 14' flows down the slope and is collected in the post-coating liquid collection container 15, and then passed through the collection pipe 16.
After that, it is collected in a liquid tank. That is, the reception and transfer gutter 14, 14' functions to receive the excess liquid and transfer it to the recovery container 15. When the collection container 15 is made movable in the direction of arrow B, it becomes possible to collect all the flowing liquid at the start of coating, for example.

The web used in the present invention includes paper, plastic film, metal, resin coated paper, synthetic paper, and the like. The material of the plastic film includes, for example, polyolefins such as polyethylene and polypropylene, vinyl polymers such as polyvinyl acetate, polyvinyl chloride, and polystyrene;
Polyamides such as 6,6-nylon and 6-nylon, polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polycarbonates, and cellulose acetates such as cellulose triacetate and cellulose diacetate are used. Further, the resin used for resin coated paper is typically polyolefin such as polyethylene, but is not necessarily limited thereto. Further, as the metal web, for example, there is an aluminum web.

As the coating liquid S, a photographic emulsion, a magnetic agent, a pressure-sensitive copying agent, a heat-sensitive recording agent, a coating agent for planographic printing plates, an undercoat agent, and other general coating liquids can be used.

The present invention is not limited to the embodiments, but can be widely applied. For example, it is also applicable to multilayer simultaneous coating. It is also possible to provide the receiving and transferring gutter 14, 14' with a recovery function without providing the excess liquid recovery container 15.

[Effect of idea]

According to the present invention, the coating width can be easily changed according to the width of the web as described above.

In addition, it is possible to recover the coating liquid, and it is also possible to eliminate web loss and changeover time loss.

Further, according to the present invention, since the surplus liquid recovery device can be made compact, it is possible to reduce the height of the curtain film, and stable coating is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a coating device according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a plan view thereof. 1... Slide hopper, 6... Inclined plate, 9...
...Thin film coating liquid flowing down, 11...Support, 1
4, 14'... Reception transfer gutter, 15... Collection container,
20, 20'...Edge Guide.

Claims (1)

[Scope of utility model registration request] In an apparatus for coating at least one coating liquid in the form of a thin film flowing down between edge guides via an inclined plate by colliding with a traveling band-shaped support, a support is provided between the inclined plate and the band-shaped support. A coating liquid collection container that can be moved back and forth along the direction of movement of the coating liquid, and a gutter that receives excess liquid from a portion where the width of the thin film liquid is wider than the width of the support and transfers it to the collection container. A coating device characterized by: