JPH0451904Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating device. Particularly in the production of photographic light-sensitive materials such as photographic film and photographic paper, recording materials such as photosensitive printing plates, magnetic recording materials such as magnetic recording tape, and pressure-sensitive copying materials, continuously running long strip supports are used. The present invention relates to an apparatus for applying a coating liquid such as a photographic emulsion or a magnetic agent to a web (hereinafter referred to as a "web"). 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.

[Conventional technology]

A typical example of devices that apply a thin film of coating liquid by colliding with a traveling band-shaped support is a curtain coating device.

Curtain coating equipment is a device that forms a free-falling curtain made of one or more types of coating liquid and causes it to collide with the object to be coated to form a coating film on the object. It has been used for coating, but 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.

Further, Japanese Utility Model Application Publication No. 59-176676 by the inventor of the present invention discloses a coating apparatus as shown in FIG.

That is, at least one type of coating liquid flowing lower layer 8 in the form of a thin film flows down on the slide inclined surface 6 that slopes downward.
In this device, edge guides 20a and 20 support both ends of a freely falling thin film-like coating liquid film 9.
A support guide mechanism (track 12, running body 13) and a drive mechanism 22 are provided to move the slider b and the tip lip 7 of the slide slope 6 while maintaining a predetermined gap.

The present applicant has also proposed a method of changing the coating width in accordance with the width of the support in Japanese Patent Application Laid-Open Nos. 60-75354, 61-477, and 61-35880.

[Problem that the invention attempts to solve]

However, in the conventional device, the width of the falling layer 8 flowing down the slide slope 6 from the slot 3 of the liquid supply device 1 is larger than the width of the support 11, and the thin coating liquid film 9 that falls freely is Edge Guide 20
Apply with the spacing between a and 20b matching the width of the support,
A device was required to collect residual liquid from the excess membrane portion that falls from both ends.

The purpose of the present invention is to provide a curtain coating device that automatically changes the outflow width from a liquid supply device and the interval between guides at both ends supporting the membrane in response to changes in the width of the web, thereby eliminating the need for processing excess liquid. That's true.

Another object of the present invention is to provide a curtain coating device that is compact in terms of equipment.

[Means for solving problems]

The above-mentioned object of the present invention is to provide a coating device in which at least one type of coating liquid in the form of a thin film is applied by colliding with a traveling belt-shaped support, so that the width of the coating liquid film flowing down is equal to the width of the liquid flowing out from the slot of the liquid supply device. This is achieved by a coating device characterized by having a drive mechanism and a support guide mechanism that change both the spacing between the guide plates and the spacing between the edge guides at both ends that support the free-falling coating liquid film.

In the present invention, the "coating liquid" includes liquid compositions of various types depending on the application, such as light-sensitive emulsion layers, undercoat layers, etc. in photographic light-sensitive materials,
Coating liquid for protective layer, back layer, etc. Coating liquid for magnetic layer, undercoat layer, lubricating layer, protective layer, back layer, etc. in magnetic recording media; Other adhesive layer, colored layer, anti-corrosion layer , etc., and these coating liquids contain a water-soluble binder or an organic binder.

The band-shaped support used in this invention is as follows:
Paper, plastic film, metal, resin coated paper, synthetic paper, etc. are included. Examples of the material of the plastic film include 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, polyethylene terephthalate, and polyethylene-2- Polyesters such as 6-naphthalate,
polycarbonate, cellulose triacetate,
Cellulose acetates such as 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.

In the present invention, the falling coating liquid film includes both the width of the liquid flowing out from the slot of the liquid supply device that supplies the liquid and the width of the liquid film between the guides at both ends that support the film.

The liquid supply device for supplying the liquid in this invention is as follows:
These are so-called slide hoppers, extrusion hoppers, and liquid supply devices that are a combination of extrusion hoppers and slide hoppers.

The mechanism for changing the width of the liquid flowing out from the slot of the liquid supply device in this invention is to adjust the width of the slot from which the liquid supply device discharges the coating liquid film from both ends of the slot so that the coating width becomes narrower than the web width according to the web width. The sealing mechanism includes a guide plate according to the width of the slot when the liquid supply device has a sliding slope, and a device for moving them.

The mechanism of the present invention that changes the interval between the edge guides at both ends that support the free-falling coating liquid film is a thin film that freely falls from the tip lip of the inclined surface onto the web so that the coating width becomes narrower than the web width according to the web width. It includes edge guides installed at both ends of the coating liquid film and a device for moving them.

In the present invention, the purpose of the present invention is to eliminate the need to collect the remaining liquid in the excess film portion that is not applied to the support, so all the coating liquid flowing out from the slot of the liquid supply device is coated in a thin film that falls freely. Both the width of the slot and the spacing between the edge guides at both ends can be changed to create a liquid film.

[Effect]

The present invention provides an apparatus for coating at least one type of coating liquid in the form of a thin film by colliding with a traveling strip-shaped support, in which the width of the coating liquid film flowing down is determined by the interval between the outflow width guide plates from the slot of the liquid supply device, and The distance between the edge guides at both ends that support the free-falling coating liquid film is
By having a drive mechanism and a support guide mechanism that change together, the coating liquid film flowing out from the slot of the liquid supply device becomes a thin coating liquid film that falls freely, so it is possible to collect excess liquid that is not coated on the support. This eliminates the need for a compact curtain coating device.

〔Example〕

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In FIG. 1, a fixed amount of coating liquid S is fed from a liquid tank (not shown) through a metering pump P into a cavity 4 in a coating liquid supply device 1, which is a slide hopper. The coating liquid S flows out through the slot 3 whose width is narrower than the cavity 4, flows down the slide slope 6 of the slide hopper 1 as a flowing layer 8, and flows down the slide slope 6 of the slide hopper 1 into the tip lip (hereinafter referred to as (referred to as a "rip"). In Lip 7. A free-falling coating liquid film 9 of the coating liquid S is formed.

On the other hand, a belt-shaped support 11 is running from the original roll via a pass roller 2, and a thin coating liquid film 9 collides with the running belt-shaped support 11 to form a coating film 10.

As shown in FIG.
It extends from to just above the coating passage. These edge guides 20a, 20b promote the formation of a freely falling thin coating liquid film 9 and define the width when it collides with the surface of the web 11.

In the embodiment shown in FIG. 1, the support and guide mechanism 14 of the present invention is composed of a track 12 and a running body 13, and these running bodies 13 are driven by a drive mechanism composed of, for example, a hydraulic servo cylinder or an electric motor and a feed screw. 22 etc., it becomes possible to move in the width direction of the support body. That is, from the running body 13 that can slide on a track 12 fixedly laid on the frame 17 of the coating machine, to the edge guides 20a, 20b, and the guide plate 1 that defines the width of the slot 3 of the coating liquid supply device 1.
9a and 19b are attached so as to be movable in the width direction of the web 11.

That is, when the web end detector 15 detects the fluctuation of the web 11, it generates a position signal according to the positions of the cylinders 23a and 23b, and depending on the amount, the servo cylinder, which is the drive mechanism 22 that drives the traveling body 13, moves.

Accordingly, the traveling body 13 moves in the width direction on the track 12, the edge guides 20a and 20b move, and the coating width of the free-falling coating liquid film 9 follows.

In addition, the drive mechanism of the present invention includes a drive mechanism using an electric motor, a feed screw, and a slide guide mechanism, and a drive mechanism in which the web end detector 15 and the traveling body 13 are mechanically connected, as is commonly used, and a hydraulic A device in which the traveling body 13 is moved according to the detected position using a cylinder is also possible, and the present invention is not limited to a fixed drive mechanism.

Moreover, various structures can be applied to the support guide mechanism.

As the coating liquid supply device according to the present invention, a hopper type liquid supply device having no sliding surface as shown in FIG. 2 is also possible.

That is, in the case of an extrusion hopper, guide plates 19a and 19b are inserted into the slot 3 and connected to the support guide mechanism 14 together with edge guides 20a and 20b, respectively, and the web end detector 1
The structure is such that it can be moved by a drive mechanism 22 in response to a position signal No. 5.

In addition, the sliding inclined surfaces 6 of the guide plates 19a and 19b that define the width of the slot 3 of the coating liquid supply device 1
The parts in contact with the liquid are made of a material with a low coefficient of friction and water repellency, such as Teflon.

The members of the guide plates 19a and 19b are connected to a guide plate holding plate 21 made of a metal plate such as SUS or a highly rigid resin using screws or the like. This guide plate holding plate 21 is connected to the traveling body 13 via arms 25a and 25b, and can be moved according to the width to be coated.

In addition, the guide plate holding plate 21 is the holding plate 2.
4a, 24b, the sliding inclined surface 6 is fixed by means such as hydraulic (pneumatic) cylinders 26a, 26b.
is crimped to prevent liquid leakage.

On the other hand, when changing the coating width, the hydraulic (pneumatic) cylinder 2
3b etc. by slightly separating the presser plate 24.
a and 24b are lifted from the guide plate holding plate 21 so that the guide plates 19a and 19b can move freely.

The contact surfaces of the holding plates 24a, 24b and the guide plate holding plate 21 are polished to a smooth finish so that force can be applied evenly.

[Effect of idea]

The present invention is an apparatus for coating at least one type of coating liquid in the form of a thin film by colliding with a traveling strip-shaped support, in which the width of the coating liquid film flowing down is determined by the interval between the liquid outflow width guide plates from the slots of the liquid supply device. , the coating device is characterized by having a drive mechanism and a support guide mechanism that change the distance between the edge guides at both ends that support the free-falling coating liquid film, so that all the falling layers flowing down the slide slope are guided by the edge guides and are free to flow. Since it is absorbed into the falling coating liquid film in the form of a thin film, even if the width of the support is changed, the width of the falling layer and free-falling coating liquid film can be adjusted accordingly, eliminating the need for processing excess liquid. Curtain coating becomes possible, and equipment for processing excess liquid is therefore not required, making it possible to provide a compact coating device.

[Brief explanation of the drawing]

FIG. 1 is a side view of a coating device of the present invention, FIG. 2 is a side view of a modification of the present invention, and FIG. 3 is a perspective view of an example of a conventional coating device. 1... Coating liquid supply device, 2... Pass roller, 3...
...Slot, 4...Cavity, 6...Slide slope, 7...Lip, 8...Fluxing layer, 9...Free falling coating liquid film, 10...Coating film, 11...Support, 1
2... Track, 13... Running body, 14... Support guide mechanism, 15... Web end detector, 19a, 19b
... Guide plate, 20a, 20b ... Edge guide, 21 ... Guide plate holding plate, 22 ... Drive mechanism, 23a, 23b ... Hydraulic (pneumatic) cylinder, 24a, 24b ... Holding plate, 25a, 25b
...Arm, 26a, 26b...Hydraulic (pneumatic) cylinder.

Claims (1)

[Scope of utility model registration request] In a device that applies at least one type of coating liquid in the form of a thin film by colliding with a traveling band-shaped support, the width of the coating liquid film flowing down is determined by the liquid outflow width guide plates 19a and 19b from the slot of the liquid supply device. 1. A coating apparatus comprising a drive mechanism 22 and a support guide mechanism 14 that change both the interval between the two edge guides 20a and 20b that support the free-falling coating liquid film.