JPH10323604A - Apparatus and method for coating of curtain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of contamination of a coater and a quality defect by preventing sputtering of a travelling web while a coating excess part is controlled by a method wherein a tip of a shoe plate is made to stand by under a state in contact with the web behind a dropping position of a curtain memberane during coating operation, and the curtain membrane is applied to the web. SOLUTION: A receiving pan 3 for recovery of a curtain membrane 2 is arranged between a curtain head 1 and a travelling web 11 before start of coating. A shoot plate 4 is fitted to a travelling side tip of the web 11 of the receiving pan 3, and a tip of the shoot plate 4 is transferred before and after a dropping position of the curtain membrane 2 under a state in contact with the web 11. During coating operation, the tip of the shoot plate 4 stands by at a position of 10 to 200 mm behind the dropping position of the curtain memberane 2 under a state in contact with the web 11 behind the dropping position of the curtain membrane 2, and the curtain membrane 2 wherein the tip of the shoot plate 4 comes in contact with the web 11 at an upward angle of 2 deg. or over to a horizontality of the shoot plate 4, is applied to the web 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curtain used for coating photographic printing paper, magnetic recording paper, heat-sensitive recording paper, pressure-sensitive recording paper, ink-jet receiving paper, thermal transfer receiving paper, pigment-coated paper and the like. Regarding the coating device, in particular, it suppresses the excess amount of coating generated at the start and stop of coating, and at the same time, cuts off the air flow on the web and side accompanying the running of the web during the coating operation, and further prevents the running web from fluttering. And a coating method.

[0002]

2. Description of the Related Art A curtain coating apparatus is a so-called pre-metering type coating apparatus which performs measurement before performing a coating operation, and is a post-metering type in which an excess coating solution is supplied to a web and then measured to a specified amount. Unlike the coating method, the liquid composition of the coating liquid does not change with time, and a coated object of stable quality can be obtained for a long time. Further, multi-layer coating is possible, and the coating speed has a high upper limit depending on the coating conditions, so that a coated object can be obtained efficiently.

As described above, since the curtain coating apparatus has many advantages, it can be used for photographic printing paper, magnetic recording paper, heat-sensitive recording paper, pressure-sensitive recording paper, ink-jet receiving paper, thermal transfer receiving paper, pigment-coated paper, and the like. This is a coating method used in various coating fields.

[0004] In general, at the start of coating in curtain coating, a shield is provided between a curtain film and a web formed in advance, so that all the coating liquid is captured by the shield, and the shield is removed. This is done by bringing the curtain membrane into contact with the web. The application is stopped by returning the shield to the position before the application and again shielding between the curtain film and the web. In such a coating start and coating stop operation, as described in detail below, a portion where the coating amount is excessively supplied to the web (hereinafter referred to as an excessive coating portion) is formed, and the excessive coating amount that has passed through the drying zone with incomplete drying is formed. The part contaminates the roll with the coating solution, making the coating operation difficult and causing a serious quality defect.

[0005] The formation process is different in the formation of the excessively coated portion immediately after the start and stop of the coating. That is, the application is started by moving and retracting the shield placed between the web and the curtain head. At this time, the curtain film is cut by the end of the shield, and the cut end of the curtain film forms a liquid film thicker than the curtain film thickness due to the surface tension of the coating liquid. When this thick tip touches the web,
An excess coating portion is formed at the coating start portion where the coating amount becomes excessive.

The overcoated portion formed on the web is in an undried state by ordinary drying, and the overcoated portion transfers the excess coating solution at a portion which comes into contact with a roll used to transport the web. Further, a part of the coating liquid transferred to the roll retransfers to the coating layer on the web surface, or disturbs and peels off the normal coating layer, thereby causing coating defects. Therefore, the formation of the over-applied portion adversely affects the quality of the coated object. Further, in order to remove the coating solution that has contaminated the rolls, the apparatus must be stopped, and the production efficiency must be significantly reduced.

On the other hand, when the coating is stopped, a shielding material is inserted between the curtain film and the web, and the curtain film is cut again by the edge of the shielding material. The film contracts due to its surface tension, becomes a rod-shaped liquid dripping that is thicker than the curtain film thickness, and falls on the web to form an excessively coated portion. In addition, when the curtain film is cut, the coating liquid adheres to the shield and becomes droplets, which fall on the web, and form an excessively coated portion. Therefore, the roll is contaminated with the coating liquid in the excessively coated portion as in the case of starting the coating. In this case, too, the roll cleaning operation is inevitable, resulting in a decrease in production efficiency.

As a means for suppressing the formation of these over-applied portions, there is a method in which the position of a shield used in the coating start and stop operations is brought as close as possible to the web to minimize the excess amount of the over-applied portions. . Although this method is effective, on the other hand, the shield must have the function of a liquid receiving tank to receive a certain amount of coating liquid, so that a weir with a certain height is set at the end of the shield. is necessary. Therefore, even if the shield is brought close to the web, the point at which the curtain film is cut at the end of the shield to start and stop the application (hereinafter referred to as a curtain film cut point) is increased to some extent. In the method described in U.S. Pat. No. 3,508,947 (see FIG. 6) in which coating is started and stopped by a liquid receiving plate 24 obliquely crossing the curtain film 2, the liquid receiving plate 24 is provided with a liquid receiving tank. Although the function of (1) is not required, the curtain film 2 is
The liquid receiving plate 24
The cutting point of the curtain film 2 needs to be kept at a distance from the web 11. That is, in these methods, the distance between the drop starting point and the web 11 is at least several c.
m is required, and does not serve as a means for suppressing the formation of an excessively applied portion.

Further, in a coating starting apparatus using a receiving pan (see FIG. 7) described in Japanese Patent Publication No. 2-503888, the distance between the curtain film cutting point and the web can be set to several mm. However, there is a great possibility that the coating liquid received by the shield will spill out of the shield with a slight shaking due to the movement of the receiving pan 26, and in fact, the function of the liquid receiving tank and the gap between the curtain film cutting point and the web 11 It is difficult to make the distance between several millimeters sufficiently compatible with each other, and as a result, an excessively coated portion that is problematic will be formed.

However, according to the method described in Japanese Patent Application Laid-Open No. 2-503888, when the coating is stopped, the coating liquid received on the shielding object is removed in advance, and a measure for spilling the coating liquid from the shielding object is taken. It can be said that the coating can be stopped without forming an excessively coated portion. However, for the start of coating, since the shield receiving the coating liquid is moved from between the curtain film and the web, the coating liquid is easily spilled during the movement, and even in the method described in JP-T-2-5038884, This results in the formation of an excessively applied portion.

Further, Japanese Patent Application Laid-Open No. 3-94863 discloses that
As a method of confirming the formation of a stable curtain film prior to the start of coating and starting coating so as not to disturb it, a liquid receiving plate 2 having a shallow dish shape or a flat plate shape having a rising portion may be used.
7 is inserted between the lower end of the edge guide that supports both ends of the curtain film 2 and the running web 11 to collect the curtain film 2 and the liquid receiving plate 27 is moved back and forth to remove the curtain film 2. A method for starting and stopping application is described (see FIG. 8).

Japanese Patent Application Laid-Open No. 4-61951 discloses that in the case of an L-shaped liquid receiving plate described in Japanese Patent Application Laid-Open No. 1-304076, the lower surface of the tip is wet with the coating liquid for the curtain film. The coating liquid is finally transferred to the web together with the curtain film applied to the web to improve the excess coating, and a weir plate 29 having a V-shaped cross section is provided at the tip of the liquid receiving plate 29. Since the curtain film 2 flows along the V-shaped weir plate 29, it is possible to perform application without excessive application to the web 11 at the start of application without wetting the lower surface of the liquid receiving plate 28. (See FIG. 9).

In the above-mentioned liquid receiving plate having a weir plate at the end thereof, the distance between the conventional liquid receiving plate and the web can be reduced, but the distance is not 0 mm, and the curtain film is cut. It is inevitable that a curtain film falling from a point causes an overcoating portion. In addition, there is a problem that the position where the wind shield plate for blocking the air flow accompanying the continuously running web is limited due to the mounting position of the liquid receiving plate, and the curtain film becomes unstable due to the air flow.

That is, in curtain coating in which a coating film is formed by flowing down the curtain film and making contact with the web, an excessively coated portion is not formed, and airflow accompanying the continuously running web is cut off to form the curtain film. It is very difficult to start coating in a stable state, and there has been no such method.

[0015]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and suppresses an excessive amount of coating caused by the start and stop of coating, and at the same time, the web and side entrainment accompanying the running of the web during the coating operation. An object of the present invention is to shut off an air flow, further prevent flapping of a running web, prevent contamination of a coating apparatus, and suppress generation of quality defects.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a curtain coating apparatus for performing coating by causing a curtain film falling from a curtain head to collide with a continuously running web. A receiving pan for collecting the curtain film is disposed at the end of the pan, and a chute plate is attached to the end of the receiving pan on the web running side so that the end of the chute plate can contact the web. It moves before and after the film drop position, and during the coating operation, the tip of the chute plate is in contact with the web behind the curtain film drop position, and the position of the chute plate tip is 10 to 200 mm behind the curtain film drop position. Wait, and apply a curtain film to the web where the chute plate has an upward angle of 2 ° or more with respect to the horizontal and the tip of the chute plate contacts the web. Ten is a coating apparatus and a coating method.

Another aspect of the present invention is a curtain coating apparatus that performs coating by colliding a curtain film falling from a curtain head with a continuously running web, and collects the curtain film between the curtain head and the running web before the start of coating. A chute plate is attached to the end of the pan on the web running side so that the end can contact the web, and the end of the chute plate contacts the web before and after the curtain film drop position. During the coating operation, the tip of the chute plate is in contact with the web behind the curtain film dropping position and waits at the position of the chute plate tip 10 to 200 mm behind the curtain film dropping position, and shoots. When the plate is at an upward angle of 2 ° or more with respect to the horizontal, the tip of the chute plate contacts the web, and the web is positioned on the back of the web behind the curtain film drop position. The supporting plate is provided, a curtain coating apparatus for applying a curtain film to the web.

According to another aspect of the present invention, there is provided a curtain coating apparatus which performs coating by colliding a curtain film falling from a curtain head with a continuously running web, wherein the curtain film is formed between the curtain head and the running web before the start of coating. A receiving pan for collection is arranged, and a chute plate is attached to the web running end of the receiving pan so that the tip can contact the web. Moving back and forth, the tip of the chute plate is in contact with the web behind the curtain film drop position during application work, and the position of the chute plate tip waits at a position 10 to 200 mm behind the curtain film fall position, and The chute plate has an upward angle of 2 ° or more with respect to the horizontal, the tip of the chute plate comes into contact with the web, Together, the bladed dry edge mounted vertically movably on the front sides of the curtain head is lowered, a curtain coating apparatus for applying a curtain film to the web.

Still another aspect of the present invention is a curtain coating apparatus for performing coating by colliding a curtain film falling from a curtain head with a continuously running web, wherein the curtain film is applied between the curtain head and the running web before the start of coating. A receiving pan for collection is arranged, and a chute plate is attached to the web running end of the receiving pan so that the tip can contact the web. Moving back and forth, the tip of the chute plate is in contact with the web behind the curtain film drop position during application work, and the position of the chute plate tip waits at a position 10 to 200 mm behind the curtain film fall position, and When the chute plate has an upward angle of 2 ° or more with respect to the horizontal, the tip of the chute plate contacts the web, and the web is behind the curtain film drop position. Provide a support plate, further recede from the curtain film drop position of the receiving pan, lower the bladed dry edge attached to the front side of the curtain head so as to be able to move up and down, and apply the curtain film to the web with the curtain coating device. is there.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and various forms are possible. Needless to say.

FIG. 1 is a schematic diagram of a coating apparatus showing an embodiment of the present invention before coating of a curtain film, and FIG. 2 is a schematic diagram of a coating apparatus showing a coating state of a curtain film of the present invention.
FIG. 3 is an enlarged view showing the mounting of the receiving pan and the chute plate in the portion A of FIG. 1, FIG. 4 is an explanatory view showing a state at the start of coating according to the present invention, and FIG. It is a schematic diagram of the application device shown.

FIG. 1 shows an embodiment of the coating apparatus according to the present invention, and is a schematic view showing a state before the curtain film 2 is coated on the web 11. The curtain head 1 is arranged above the web 11 supported by the rolls 7 and 8 and running continuously on an inclined plane. In order to receive the coating liquid flowing down from the curtain head 1 and forming the curtain film 2, the receiving pan 3 is connected to the web 11. It is arranged between the curtain heads 1. A coating liquid recovery tank 6 is provided below the web 11, and the coating liquid received by the receiving pan 3 flows from the liquid outlet 5 and falls into the coating liquid recovery tank 6 for receiving the coating liquid. The collected coating liquid is collected in a storage tank (not shown). Further, the coating liquid received by the receiving pan 3 may not be returned to the storage tank and may be collected in another storage tank.
These are performed depending on the characteristics of the coating liquid. The supply of the coating liquid to the curtain head 1 is performed by a liquid supply pump 9. Further, it is preferable that the roll 8 can be moved up and down so that the running inclination angle of the web 11 can be adjusted.

In the present invention, the curtain film 2 falls, and the air flow accompanying the web 3 is shielded near the curtain film falling position (hereinafter, referred to as an application section 18; see FIG. 4) in contact with the web 3, Curtain film 2 by circulation of air around the curtain
In order to reach the web 3 without disturbing,
In some cases, such a wind shield plate 10 is provided. Also, the position of the roll 8 in FIG. 1 is positioned very close to the coating unit 18, and the direction of the web 3 is
In some cases, the configuration may be such that the influence of air accompanying the air on the application section is minimized.

FIG. 2 shows a state during the coating operation of the coating apparatus of the present invention. The tip of the chute plate 4 is in contact with the web 11 at a position 10 to 200 mm behind the coating section 18 of the curtain film. It is preferable to shut off the air flow entrained by the continuous running of the web 11.

The receiving pan 3 used in the coating apparatus of the present invention
The chute plate 4 is attached to the leading end of the web 11 in the running direction, and a typical example thereof is shown in FIG. FIG. 3A shows the receiving pan 3 configured by providing a stopper 13 at the front of the liquid receiving bottom surface 12, both side walls 14, the rear wall 15, and the liquid receiving bottom surface 12. The chute plate 4 is fixed to a shaft 16 having both ends in the corner as axes.
The shaft 16 is fitted to both side walls in the vicinity of 3. Since the chute plate 4 is moved by the shaft 16, the chute plate 4 can always be kept in contact with the continuously running web 3. Therefore, it is preferable that a portion of the tip of the chute plate 4 that comes into contact with the web 11 be edge-cut so as to reduce the corner. The height of the stopper 13 is adjusted so that the angle θ of the chute plate 4 with respect to the horizontal is not less than 2 ° so that the coating liquid of the curtain film 2 dropped on the chute plate 4 flows to the pan 3 side. The stopper 13 also has a function of receiving the coating liquid having received the curtain film 2 on the liquid receiving bottom surface 12 and preventing the coating liquid from flowing out of the pan 3.

FIG. 3B shows a state in which the shaft 16 is fitted to both side walls 14 at a position slightly behind the vicinity of the tip of the liquid receiving bottom surface 12. It may be located at the front of the receiving bottom surface 12 or near the shaft 16. The height of the stopper 13 is adjusted so that the angle θ of the chute plate 4 does not become 2 ° or less as in FIG.

In FIG. 3C, a contact bar 17 is attached to the front end of the bottom surface 12 of the receiving pan 3 having the same structure as that of FIG. 3B. The contact bar 17 can be brought into contact with the web 11 by extending the tip of the liquid receiving bottom surface 12 or changing the running inclination angle of the web 11 by raising the position of the roll 8. 3 (c), the chute plate 4 is attached to the receiving pan 3 and the contact bar 17 and the tip of the chute plate 4 come in contact with the web 11 at two places, and the air flow accompanying the continuous running of the web 11 Can be blocked, so that a stable curtain film 2 can be formed.

The receiving pan 3 shown in FIG.
3, the front end of the liquid receiving bottom surface 12 is extended to serve as a stopper 13 without using the liquid receiving bottom surface 12, the side walls, and the rear wall. As a method for preventing the angle θ of the chute plate 4 with respect to the horizontal from dropping below 2 °, the side walls 14 of the shaft 16 attached to the chute plate 4
It can be performed by considering the position where the liquid receiving surface is fitted, or by extending the front end of the liquid receiving bottom surface 12.

The length of the chute plate 4 is 100 to 300 mm
Preferably, the width is longer than the width of both edge guides 22 (see FIG. 5) so that the falling curtain film 2 can be received in the entire width. When the length is 100 mm or less, the curtain film once cut at the shaft portion of the chute plate 4 causes slight shaking due to the cut impact, causing a state where the curtain film 2 is not stable, and when flowing on the chute plate 4 Since the coating film is applied to the web 11 before the effect of the falling energy of the coating liquid flowing down as the curtain film cannot be sufficiently reduced, a sufficient stabilizing effect cannot be obtained. May cause coating unevenness or the like. When the length is 300 mm or more, the moving distance of the chute plate 4 becomes long, a large space is required, and the unsmeared web runs unnecessarily before being applied to the web 11, which is not desirable in terms of work efficiency.

The chute plate 4 attached to the receiving pan 3 used in the present invention needs to have an upward gradient from the horizontal position. That is, the inclination of the chute plate 4 is
This is because it has a function of collecting the coating liquid forming the liquid on the liquid receiving bottom surface 12. If there is no inclination, the coating liquid that has formed the curtain film 2 that has fallen on the chute plate 4 drops onto the web 11 due to vibration during the movement of the receiving pan 3 and during the coating operation, and forms an excess coating portion. In some cases. Further, the inclination of the chute plate 4 is 2 degrees with respect to the horizontal direction.
° or more is preferable. As described above, when the angle (θ) is 2 ° or more, the coating liquid that has formed the curtain film 2 that has flowed down to the chute plate 4 is collected on the liquid receiving bottom surface 12.
If it is less than the above range, it may not be completely collected on the liquid receiving bottom surface 12 due to the impact of the movement of the receiving pan 3 or the like.

The process of starting the coating according to the present invention is performed as shown in FIGS. 4A to 4C. After the running speed of the web 3 reaches a specified speed, the receiving pan 3 is moved, and the curtain is moved. Membrane 2
Is brought into contact with the continuously running web 3 to perform coating. Here, when the coating is interrupted, for example, when the web 3 is cut, the coating liquid is collected in the coating liquid collecting tank 6. The coating liquid recovered in the coating liquid recovery tank 6 is not returned to the storage tank,
In some cases, collection is performed in another storage tank.

The process of the coating start operation of the present invention shown in FIG. 4 will be described in order. First, in FIG. In the state where the coating is stopped, the curtain film 2 is dropped on the liquid receiving bottom surface 12 of the receiving pan 3. In the second stage at the start of the application, when the receiving pan 3 is moved and retracted, the curtain film 2 is once cut at the shaft portion of the chute plate 4. The third stage is Figure 3.
The chute plate 4 moves under the curtain film 2 while forming a solid-liquid interface as shown in FIG. The fourth stage is FIG.
As shown in (c), the curtain film 2 is brought into contact with the web 11, and the start of coating is completed. With the curtain coating device of the present invention, the liquid on the liquid receiving bottom surface 12 does not spill out of the receiving pan 3 by the stopper 13. Further, the coating liquid on the chute plate 4 is also collected on the liquid receiving bottom surface 12 because the chute plate 4 has an inclination, does not spill out of the receiving pan 3, and does not form an excessively coated portion.

In the present invention, the above-described operation is the basis. In the present invention, as shown in FIG.
It is necessary to be in a position where it flows directly into the inside. The curtain film 2 is once cut by the shaft portion of the chute plate 4, and a uniform and stable curtain drop portion is formed on the chute plate 4.
In order to suppress the excessive coating, the curtain film 2 must flow down into the liquid receiving bottom surface 12 as the first stage at the start of coating.

In the present invention, when the receiving pan 3 is moved in the running direction of the web 11 in order to start and stop the coating, the curtain film is cut while the tip of the chute plate 4 is in contact with the web 11. Since the curtain film 2 falls onto the liquid receiving bottom surface 12 of the receiving pan 3 from the chute plate 4, the formation of an excessively applied portion does not occur.

As shown in FIG. 1, a web support plate 19 is provided on the back side of the web 11 behind the curtain dropping position and is brought into contact with the back side of the web 11, so that the web 11 between the rolls 7 and 8 is provided.
Is preferable because the continuous running of the web 11 is stabilized, the collision with the curtain film 2 is stabilized, and a uniform coating layer is obtained. Further, by providing the web support plate 19, it is possible to shut off the air flow accompanying the back surface of the web 11 during continuous running, and it is possible to prevent the air flow on both sides of the curtain film falling position from being disturbed. .
The web support plate 19 forms a contact portion between the plate-shaped member and the web 11 with a pipe, a column, or a member having a radius of curvature, and preferably does not damage the back surface of the web 11.

FIG. 5 shows the bladed dry edge 20 of the present invention.
Are provided on both sides of the continuously running web 11, respectively. The dry edge 20 with blades is a lifting device 21
The two lifting devices 21 are attached to the left and right of the curtain head 1. The dry edge presses down on both sides of the web 11 so as to eliminate excessive application of the curtain film 2 on both sides of the web 11, and the blades are attached to the lower end of the dry edge only on both sides of the web 11. This is to shut off the air flow.

The curtain head 1 in the curtain coating apparatus and the coating method of the present invention is not particularly limited, and can be applied to all curtain heads such as a slot type as shown in FIG. 1 and a slide type as shown in FIG. Exhibits the effect of suppressing excess parts. Further, in the present invention, a contact portion between the web 3 and the curtain film 2, that is, a coating portion is applicable to various coating portions, and is supported between the rolls 7 and 8 as shown in FIG. Of course on the web,
Even if the web is supported on the backup roll 23 as shown in FIG. Moreover, when the curtain film 2 is wider than the width of the web 3 and the coating portion exists over the entire width in the web width, or when the curtain film is narrower than the web width and the curtain film is not applied to both ends in the web width direction. Also exerts an effect of suppressing an excessively applied portion.

The speed at which the receiving pan 3 moves while the chute plate 4 passes under the curtain film 2 at the start of coating according to the present invention is preferably about 12 m / min to 400 m / min.

Next, the coating liquid and the web used in the present invention will be described. In addition, the application speed and the application liquid supply amount at the time of application will be described.

In the present invention, the coating solution is a photographic emulsion solution in which silver halide is dispersed in an aqueous gelatin solution, and a magnetic material coating solution in which magnetic particles are dispersed in water or an organic solvent. As a thermosensitive coloring material coating liquid, a color developing agent and a developer dispersed therein, as a pressure-sensitive coloring material, a microcapsule containing a coloring agent or a developing agent dispersed therein, as a pigment coated paper coating liquid, Any coating liquid capable of performing curtain coating, such as a dispersion of inorganic or organic pigments, irrespective of the solid content concentration, can be used without any limitation. Is preferably in the range of 10 cps to 1000 cps.

Examples of the web used in the present invention include generally used high-quality paper, medium-quality paper, paper-changed paper, machine-coated paper,
Art paper, cast coated paper, synthetic paper, resin coated paper, plastic film, metal plate, rubber plate, cloth woven with natural or synthetic fibers, and the like are included.

With respect to the coating speed, the effect of the present invention is not particularly reduced as long as it is within a condition range in which ordinary curtain coating can be performed, but it is approximately 15 m / m.
The range of in to 1500 m / min is preferable. On the other hand, the liquid amount per unit time and unit width applied to the web, that is, the flow rate is not particularly limited as long as it is within the range of ordinary curtain coating conditions, but is approximately 4 l / min / m or more.
A range of 20 l / min / m is preferred.

[0043]

According to the present invention, the chute plate is attached to the tip of the receiving pan for receiving the curtain film, the tip of the chute plate is moved in contact with the web, and the web support plate is attached to the back of the web behind the curtain film drop position. Provided and brought into contact with the web, and furthermore, the dry edges with blades on both sides of the web are brought into contact during the coating operation. It shuts off the air flow between the front and back and side of the accompanying web, prevents flapping of the running web, enables stable and uniform coating of the curtain film, does not cause contamination of the coating device, and suppresses the occurrence of quality defects. Has the effect that can be.

[Brief description of the drawings]

FIG. 1 is a schematic view of a coating apparatus showing a state before the start of coating according to the present invention.

FIG. 2 is a schematic view of a coating apparatus showing a state during a coating operation of the present invention.

FIG. 3 is an enlarged schematic view of a portion A in FIG. 1 of the present invention.

FIG. 4 is a schematic diagram showing a state at the start of coating according to the present invention.

FIG. 5 is a schematic view of a dry edge according to the present invention.

FIG. 6 is a schematic view showing a conventional coating apparatus.

FIG. 7 is a schematic view of a receiving pan used in another conventional coating apparatus.

FIG. 8 is a schematic view of a liquid receiving plate used in a conventional coating apparatus.

FIG. 9 is a schematic view of a liquid receiving plate used in a conventional coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curtain head 2 Curtain film 3 Receiving pan 4 Chute plate 5 Liquid outlet 6 Coating liquid recovery tank 7, 8 Roll 9 Liquid supply pump 10 Wind shield plate 11 Web 12 Liquid receiving bottom surface 13 Stopper 14 Side wall 15 Rear wall 16 Axis 17 Contact Bar 18 Curtain film drop position (coating section) 19 Web support plate 20 Dry edge with blades 21 Lifting device 22 Edge guide 23 Backup roll 24 Liquid receiving plate 25 Collection tank 26 Receiving pan 27, 28 Liquid receiving plate 29 Circular weir Board

Claims (12)

[Claims] 1. A curtain coating apparatus for performing coating by colliding a curtain film falling from a curtain head with a continuously running web to collect the curtain film between the curtain head and the running web before starting the coating. A receiving pan is arranged, and a chute plate is attached to the end of the receiving pan on the web running side so that the tip can contact the web, and the tip of the chute plate moves back and forth with respect to the curtain film drop position in contact with the web. And a curtain coating device for coating the curtain film on the web by holding the end of the chute plate in contact with the web behind the curtain film drop position during the coating operation. 2. The curtain coating apparatus according to claim 1, wherein the position of the tip of the chute plate during the coating operation is 10 to 200 mm behind the curtain film falling position. 3. The chute plate has an upward angle of 2 ° or more with respect to the horizontal, and the tip of the chute plate contacts the web.
The curtain coating apparatus according to the above. 4. A curtain coating method in which a curtain film falling from a curtain head collides with a continuously running web to perform coating, wherein the curtain film is collected between the curtain head and the running web before the start of coating. A receiving pan is arranged, a chute plate is attached to the end of the receiving pan on the web running side, and the tip of the chute plate is moved in contact with the web before and after the curtain film drop position at the start or stop of coating, and a chute is applied during coating operation A curtain coating method comprising: holding a leading end of a plate in contact with a web behind a curtain film drop position, and applying the curtain film to the web. 5. The curtain coating method according to claim 4, wherein the tip of the chute plate during the coating operation is located 10 to 200 mm behind the curtain film falling position. 6. The chute plate has an upward angle of 2 ° or more with respect to the horizontal, and the tip of the chute plate contacts the web.
The curtain coating method according to the above. 7. A curtain coating apparatus for performing coating by causing a curtain film falling from a curtain head to collide with a continuously running web to collect the curtain film between the curtain head and the running web before starting the coating. A receiving pan is arranged, and a chute plate is attached to the end of the receiving pan on the web running side so that the tip can contact the web, and the tip of the chute plate moves back and forth with respect to the curtain film drop position in contact with the web. During the coating operation, the tip of the chute plate is kept in contact with the web behind the curtain film dropping position, and the web support plate is provided on the back side of the web behind the curtain film dropping position to apply the curtain film to the web. Curtain coating device characterized by the above-mentioned. 8. The position of the tip of the chute plate during the coating operation is 10 to 200 mm behind the curtain film drop position, the chute plate is at an upward angle of 2 ° or more with respect to the horizontal, and the tip of the chute plate is The curtain coating device according to claim 7, which is in contact with the web. 9. A curtain coating apparatus for performing coating by causing a curtain film falling from a curtain head to collide with a continuously running web to collect the curtain film between the curtain head and the running web before starting the coating. A receiving pan is arranged, and a chute plate is attached to the end of the receiving pan on the web running side so that the tip can contact the web, and the tip of the chute plate moves back and forth with respect to the curtain film drop position in contact with the web. During the coating operation, the tip of the chute plate is made to stand by in contact with the web behind the curtain film drop position, and can be raised and lowered on both front sides of the curtain head according to the retreat of the receiving pan from the curtain film drop position. A curtain coating apparatus characterized by lowering the attached dry edge with blades and applying a curtain film to a web. 10. The position of the tip of the chute plate during the coating operation is 10 to 200 mm behind the curtain film dropping position, the chute plate is at an upward angle of 2 ° or more with respect to the horizontal, and the tip of the chute plate is The curtain coating device according to claim 9, wherein the curtain coating device contacts the web. 11. A curtain coating apparatus for performing coating by causing a curtain film falling from a curtain head to collide with a continuously running web to collect the curtain film between the curtain head and the running web before starting the coating. A receiving pan is arranged, and a chute plate is attached to the end of the receiving pan on the web running side so that the tip can contact the web, and the tip of the chute plate moves back and forth with respect to the curtain film drop position in contact with the web. During the coating operation, the tip of the chute plate is made to stand by in contact with the web behind the curtain film drop position, a web support plate is provided on the back side of the web behind the curtain film drop position, and further, the curtain film drop position of the receiving pan When the curtain is retracted, the dry edge with the wings attached to the front and both sides of the curtain head so that it can move up and down is lowered, and the curtain film is A curtain coating apparatus characterized in that the coating is performed on a web. 12. The position of the tip of the chute plate during the coating operation is 10 to 200 mm behind the curtain film dropping position, the chute plate has an upward angle of 2 ° or more with respect to the horizontal, and the tip of the chute plate is The curtain coating device according to claim 11, which contacts the web.