JPH0746372Y2 - Curtain coater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a curtain coater.

[Prior Art] FIGS. 3 and 4 show an example of a curtain coater for applying the coating material 2 to the surface of the web 1. In FIG. 3, 3 is a liquid supply provided above the web 1 moving in the direction of arrow A. In the liquid supply header 3, a chamber 4 extending in the width direction of the web 1 and a slit 5 penetrating from the lower end of the chamber 4 toward the lower end of the liquid supply header 3 are formed. As shown in Fig. 4, the width W ₁ of the slit 5 is the width W _{2 of the} web 1.
Is set larger than.

Reference numeral 6 is a tray-shaped shutter provided between the liquid supply header 3 and the web 1 so as to be retractable to the downstream side in the moving direction of the web 1, and 7 is a pan arranged below the web 1. As shown in FIG. 4, the width dimension W ₃ of the shutter 6 and the pan 7
W ₄ is set to be larger than the width dimension W ₁ of the slit 5.

When applying the paint 2 to the surface of the web 1, the chamber 4
While the paint 2 is supplied therein, the shutter 6 is positioned in the downstream direction of the moving direction of the web 1 as shown by the solid line in FIG. 3, and the web 1 is further moved in the arrow A direction.

The coating material 2 supplied into the chamber 4 becomes a curtain-shaped liquid film 8 through the slit 5 and continuously flows downward in the vertical direction, and is sequentially applied to the surface of the web 1 moving in the arrow A direction.

At this time, the width W ₁ of the slit 5 has a width dimension W ₂ of the web 1
The curtain-shaped liquid film 8 (paint) is evenly applied to the surface of the web 1 moving in the direction of arrow A, and the web of the curtain-shaped liquid film 8 flowing vertically is The portion located outside the widthwise edge 10 flows under the web 1 and is received by the pan 7.

When the application of the paint 2 is interrupted, the shutter 6 is positioned below the slit 5 as shown by the chain double-dashed line in FIG.
A shutter 6 is provided for the paint 2 that flows down as a curtain-shaped liquid film 8.
To accept.

[Problems to be Solved by the Invention] In recent years, in order to increase the efficiency of the operation of applying the curtain-shaped liquid film 8 to the web 1, there is a demand for increasing the moving speed of the web 1. When the moving speed is increased, the flow rate of the air flow B generated by the surrounding air being entrained by the movement of the web 1 and the rotation of the roller 9 for guiding the web 1 is increased, and the moving speed is also increased. A phenomenon in which the curtain-shaped liquid film 8 is wavy and turbulent due to the flow B is caused, so that the coating of the coating material on the surface of the web 1 becomes non-uniform, and therefore, the moving speed of the web 1 cannot be increased, resulting in high speed. It was a bottleneck of becoming.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a curtain coater capable of vertically flowing down a curtain-shaped liquid film in a stable state even when the moving speed of the web is increased.

[Means for Solving the Problems] The present invention is provided with a liquid supply header above a web that moves in the horizontal direction, which allows a paint to continuously flow downward in the vertical direction as a curtain-shaped liquid film extending in the width direction of the web. In the curtain coater, provided on the upstream side in the web moving direction of the liquid supply header is a wind shield plate that is arranged to face the curtain-shaped liquid film formed by the liquid supply header and that can move up and down.
A flexible thin film body capable of covering the surface of a web moving between the windshield and the curtain-shaped liquid film is attached to the lower end of the windshield.

[Operation] When applying the paint to the web, the wind shield is lowered so that the thin film body attached to the lower part of the wind shield contacts the surface of the web. Feed and move the web.

The coating material supplied into the chamber becomes a curtain-shaped liquid film through the slits and continuously flows downward in the vertical direction, and the curtain-shaped liquid film is sequentially applied to the surface of the moving web.

On the other hand, at this time, when the moving speed of the web is increased, the flow amount of the air flow generated with the movement of the web is increased, but the air flow is prevented from proceeding toward the curtain-shaped liquid film by the wind shield. Be blocked.

Further, between the wind shield and the curtain-shaped liquid film, since the surface of the web is covered with the stopped thin film body, no air flow is generated even if the web moves.

Therefore, even if the moving speed of the web is increased, the air flow does not act on the curtain-shaped liquid film, so that the curtain-shaped liquid film always flows downward in the vertical direction in a stable state and can be uniformly applied on the web surface. it can.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention, and the third embodiment
The parts denoted by the same reference numerals as in FIG. 4 and FIG. 4 represent the same things.

A guide frame 11 is provided on the upstream side of the liquid supply header 3 in the web moving direction (direction of arrow A) so as to be located above the web 1.

The guide frame 11 is seen from the upstream side in the web moving direction,
It has a gate shape that extends across the web 1 in the width direction.

A wind shield plate 12 parallel to the curtain-shaped liquid film 8 formed by the liquid supply header 3 is fitted to the guide frame 11 so as to be able to move up and down, and has a lifting cylinder 14 having a piston rod 13 extending downward. Is provided on the upper surface of the guide frame 11, and the tip of the piston rod 13 is connected via a pin 15 to a connecting bracket 16 formed at the upper edge of the wind shield plate 12.

The width dimension W ₅ (see FIG. 2) of the wind shield 12 is set larger than the width dimension W _{1 of the} slit 5 shown in FIG. 4 so that the air flow passing over the width end of the wind shield 12 is the curtain. The liquid film 8 is not affected.

A guide member 17 having a curved surface that extends horizontally in the width direction of the web 1 and projects downward is fixed to the lower edge of the wind shield 12, and the guide member 17 is formed of a flexible film or metal foil. The thin film member 18 is attached so as to cover the surface of the web moving between the wind shield plate 12 and the curtain-shaped liquid film 8 (see FIG. 1).

The width dimension of the guide member 17 and the thin film body 18 is set equal to the width dimension W ₅ of the wind shield plate 12 (see FIG. 2).

The upper end of the flexible film body 21 extending vertically is fixed to the upstream end face of the liquid supply header 3 in the web moving direction, and the lower end is fixed to the downstream end face of the wind shield 12 in the web moving direction. , The web 1 between the liquid supply header 3 and the wind shield 12
Is coated on the upper side (see FIG. 1).

The width dimension of the film body 21 is set to be substantially equal to the width dimension W ₅ of the wind shield plate 12 as in the thin film body 18 described above (see FIG. 2).

An auxiliary wind shield 19 extending perpendicularly to the width direction of the web 1 is provided on the upstream side of the bread 7 in the web moving direction so as to be positioned below the web 1, and the web is provided at the upper edge of the auxiliary wind shield 19. 1
An auxiliary guide member 20 having a curved surface that extends horizontally in the width direction and projects upward is fixed (see FIG. 1).

The widthwise dimensions of the auxiliary wind shield plate 19 and the auxiliary guide member 20 are set to be substantially equal to the widthwise dimension W ₅ of the shield plate 12 (see FIG. 2).

In the above-described structure, when the coating material 2 is applied to the surface of the web 1, the lifting cylinder 14 is operated to lower the wind shield plate 12 and bring the thin film member 18 into contact with the surface of the web 1.

Then, the coating material 2 is supplied into the chamber 4, the shutter 6 is positioned on the downstream side in the moving direction of the web 1 as shown by the solid line in FIG. 1, and the web 1 is further moved in the arrow A direction.

The coating material 2 supplied into the chamber 4 becomes a curtain-shaped liquid film 8 through the slits 5 and vertically flows down similarly to the conventional apparatus shown in FIG. 3 and FIG. Is sequentially applied to the surface of.

At this time, if the moving speed of the web 1 is increased, as shown in FIG. 1, the flow amount of the air flow B generated due to the movement of the web 1 and the rotation of the roller 9 increases, but above the web 1. , A width dimension W _{1 of} the slit 5 shown in FIG. 4, that is, a wind shield 12 having a width dimension larger than the curtain-shaped liquid film 8, a guide member 17, a thin film body 18, and a membrane body 21 for the air flow B
Are prevented from proceeding toward the curtain-shaped liquid film 8.

The surface of the web 1 moving between the windshield 12 and the curtain-shaped liquid film 8 has a thin film body 18 having a width dimension larger than that of the curtain-shaped liquid film 8 like the windshield 12 and the like. Since it is covered with, the windshield is moved as the web 1 moves.
It is also prevented that the stem in the space C between 12 and the curtain-shaped liquid film 8 becomes an air flow and goes toward the curtain-shaped liquid film.

Further, even under the web 1, like the above-mentioned wind shield 12 and the like, by the auxiliary wind shield 19 and the auxiliary guide member 20 having a width dimension larger than the curtain-shaped liquid film 8, the air flow B
Is prevented from proceeding toward the surplus portion of the curtain-shaped liquid film 8 flowing into the pan 7.

Therefore, even if the moving speed of the web 1 is increased, the web 1
Since it is possible to effectively prevent the air flow B generated due to the movement of the roller 9 and the rotation of the roller 9 from acting on the curtain-shaped liquid film 8, the curtain-shaped liquid film 8 is always vertically flowed down in a stable state, It can be uniformly applied to the surface of 1.

The curtain coater of the present invention is not limited to the above-mentioned embodiment, but the wind shield should be provided only above the web, and a lifting device other than the cylinder should be used to lift the wind shield. It goes without saying that various modifications such as the use of a rotation or turning mechanism can be made without departing from the scope of the present invention.

[Advantage of Invention] As described above, according to the curtain coater of the present invention,
Various excellent effects as described below can be obtained.

(1) An airflow block prevents an air flow generated by the movement of the web or the rotation of the roller from proceeding toward the curtain-shaped liquid film, and moves between the windshield and the curtain-shaped liquid film. Since the surface of the web to be covered is covered with a stationary thin film to prevent air flow, even if the moving speed of the web is increased, the air flow does not act on the curtain-shaped liquid film, and the curtain-shaped liquid film is always present. Can be made to flow downward in the vertical direction in a stable state and applied uniformly to the web.

(2) Even if the moving speed of the web is increased, the curtain-shaped liquid film can be uniformly applied to the surface of the web.
The productivity of the work of applying the paint to the web can be greatly improved.

[Brief description of drawings]

1 is a partially cutaway side view of an embodiment of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, FIG. 3 is a partially cutaway side view of a conventional curtain coater, and FIG. FIG. 4 is a view taken along the line IV-IV in FIG. In the figure, 1 is a web, 2 is a paint, 3 is a liquid supply header, 8 is a curtain-shaped liquid film, 12 is a wind shield, and 18 is a thin film.

Claims (1)

[Scope of utility model registration request] 1. A web, which continuously moves in the horizontal direction, above the web.
In a curtain coater equipped with a liquid supply header capable of continuously flowing downward in the vertical direction as a curtain-shaped liquid film extending in the width direction of the web, in the liquid supply header, on the upstream side in the web moving direction of the liquid supply header. A wind shield plate is provided which is arranged so as to face the curtain-shaped liquid film to be formed and can be moved up and down, and a lower end of the wind shield plate is provided with a web moving between the wind shield plate and the curtain-shaped liquid film. A curtain coater having a flexible thin film body capable of covering the surface.