JP2008253966A - Die for paste application - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology to surely prevent the remaining of air in a die and the natural flow-out of paste from the die. <P>SOLUTION: The die 1 for paste application is provided with a paste supply port 6, a manifold 5 communicating with the supply port in the downstream side of the paste flowing direction, a slit 3 communicating the manifold in the down stream side and having an opened downstream side end and a discharge port 4 formed in the opened end of the slit 3 and is structured to form an air releasing hole 7 for connecting the manifold 5 to the outside of the die 1 and to provide a stopper 8 for preventing the flow-out of the paste between the manifold 5 and the discharge port 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating technique using a die, and more particularly to a technique for a die that enables downward coating of a paste.

2. Description of the Related Art Conventionally, a coating technique using a die has been publicly known. For example, a technique of continuously forming a coating film by coating a paste on a foil with a uniform width and uniform thickness using a die is widely used.
Further, a technique for setting a die so that a paste discharge port faces downward and applying the paste downward is disclosed and publicly known.
In the prior art, when the die is set downward, the discharging operation of the coating liquid (paste or the like) is controlled in accordance with the conveying operation of the object to be coated (Patent Document 1).
Japanese Patent Laid-Open No. 9-253558

  However, in the prior art, if the paste has a high viscosity and the paste does not naturally flow out from the inside of the die, there is no problem, but depending on the paste viscosity, after supplying the paste inside the die, There was a case where the paste naturally flowed out from the downward-facing die, but there was no means for preventing this. Therefore, it is necessary to take a method of starting the supply of the paste after the supply of the object to be applied (for example, a continuous foil or the like) is started, and therefore, particularly at the start of the coating, until the discharge of the paste is stabilized It takes a long time to produce a large loss in the paste and foil.

Also, when coating with the die set downward, air remains inside the die (particularly the top of the manifold), so the remaining air is attracted to the paste and released irregularly, Air is discharged with the paste irregularly, which adversely affects the coating quality and causes a large loss in the paste and foil.
Due to these problems, it has been practically difficult to introduce downward coating with a die into the production process.
The present invention has been made in view of such a current situation, and it is an object of the present invention to provide a technique for reliably preventing air from remaining inside the die and preventing the paste from naturally flowing out of the die. It is said.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to claim 1, the paste coating die includes a paste supply port, a manifold communicating with the downstream side of the supply port in the paste flow direction, and a downstream end of the manifold. A paste coating die having an open slit and a discharge port formed at an open end of the slit, and forming an air vent hole communicating the manifold and the outside of the die; and A stopper for preventing the paste from flowing out is provided between the manifold and the discharge port.

  According to a second aspect of the present invention, the air vent hole communicates with the topmost portion in the vertical direction of the manifold.

  According to a third aspect of the present invention, the stopper is constituted by a damming member constituted by an elastic body and a damming member expansion means for expanding the damming member.

  According to a fourth aspect of the present invention, the damming member is constituted by a hollow rubber member, and the damming member expansion means is constituted by air supply means for supplying air to the rubber member. It is what.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to reliably prevent air from remaining inside the die (particularly, a manifold or the like) and to prevent the paste from naturally flowing out of the die. This enables downward coating with a die regardless of the viscosity of the paste.

  In Claim 2, it can prevent reliably that air remains in the inside of die | dye. Thereby, since the malfunction which air is discharged irregularly can be prevented, the loss of paste and foil can be reduced.

  According to the third aspect of the present invention, the slit can be dammed without any gap without damaging the inside of the slit, and the paste can be reliably prevented from flowing out.

  According to the fourth aspect of the present invention, it is possible to easily prevent the paste from flowing out from the die with a simple configuration.

Next, embodiments of the invention will be described.
FIG. 1 is an assembled perspective view showing the overall structure of a die according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 4 is a partially enlarged side sectional view showing the structure of the stopper, FIG. 5 is a side sectional view showing the structure of the conventional die, and FIG. 6 is a perspective view showing the structure of the die according to one embodiment of the present invention. FIG. 7 is a schematic diagram showing a downward coating state by a die according to one embodiment of the present invention, FIG. 8 is a schematic diagram showing an entire configuration of a conventional front / back coating system, and FIG. 9 is according to one embodiment of the present invention. It is a schematic diagram which shows the whole structure of the front and back simultaneous coating system.

First, the overall configuration of the die 1 according to an embodiment of the present invention will be described.
In the following, for convenience of explanation, the direction of the arrow X shown in FIG. 1 (the downstream side in the feeding direction of the foil) is the front (front side), the direction of the arrow Y is the left, and the arrow Z shown in FIG. The description will be made with the direction of the upper direction.
As shown in FIG. 1, the die 1 includes a pair of die bodies (that is, a front die 1a and a rear die 1b), a shim 2, and the like. More specifically, with the shim 2 interposed between the front die 1a and the rear die 1b, the bolts 22, 22,... Are formed in the bolt holes 21, 21. , And the dies 1a, 1b and the shim 2 are integrally fastened to constitute the die 1 by tightening the nuts 23, 23.
In addition, the fastening method of each die 1a * 1b and shim 2 can also be set as the structure which forms a screw groove in the bolt hole formed in one die | dye, for example, without using a nut, and this invention. The configuration of the die 1 according to the present invention is not limited to the fastening method shown in this embodiment.

  As shown in FIGS. 1 to 3, the shim 2 is a metal plate-like member formed in a substantially “U” shape when viewed from the front, and the concave portion 2 a of the “U” shape serves as a flow path for the paste. The left and right side surfaces of the slit 3 are formed. Further, the portion corresponding to the lower end of the open portion of the recess 2 a forms the left and right side portions of the paste discharge port 4.

As shown in FIGS. 1 to 3, a rear manifold 5b, which is a substantially semicircular recess when viewed in cross section, is formed in the left-right direction at a substantially central portion on the front side of the rear die 1b. The rear manifold 5b is formed with a paste supply port 6 penetrating in the front-rear direction at substantially the center of the rear manifold 5b.
In addition, an air vent hole 7 is formed through the front manifold 5b in the front-rear direction above the rear manifold 5b and at a substantially central portion on the left and right sides of the rear die 1b.
Further, a stopper hole 9 that is a recess for fitting a stopper 8 to be described later is formed below the rear manifold 5b so as to be substantially equal in width to the rear manifold 5b. The stopper hole 9 is formed with an air supply port 9a penetrating in the front-rear direction at a substantially central portion of the stopper hole 9 in the vertical and horizontal directions.

The front die 1a is formed with a front manifold 5a, which is a substantially semicircular concave section corresponding to the rear manifold 5b, in the left-right direction.
Further, slit surfaces 3a and 3b are formed below the manifolds 5a and 5b. In addition, since the smoothness according to the required quality of a coating surface is requested | required, the slit surfaces 3a and 3b are a part which should be considered so that a crack etc. may not arise.

  Then, as shown in FIG. 3, by combining the dies 1a and 1b and the shim 2, the manifolds 5a and 5b and the manifold 5, which is a substantially cylindrical gap, are formed in the left-right direction by the shim 2, The slit surface 3a of the front die 1a, the slit surface 3b of the rear die 1b, and the shim 2 form a rectangular slit 3 that opens downward from the manifold 5 in the left-right direction. And the lower end part used as the open end of the slit 3 becomes the rectangular discharge port 4 in planar view, and it discharges, forming the paste supplied in the inside of the die | dye 1 in the left-right direction with a fixed width and a fixed film thickness. It is said.

  Further, the concave portion 2a of the shim 2 is formed with a mountain-shaped top portion 2b at the top of the left and right substantially in the center when viewed from the front, and communicates with the air vent hole 7 at the highest position of the top portion 2b. .

Next, the stopper 8 which is a main part of the present invention will be described.
As shown in FIG. 3 or FIG. 4, the stopper 8 is composed of an elastic member 8a, an air pipe 10, and the like. The elastic member 8a is a hollow rubber member having a void portion 8b formed therein, and is configured to expand the volume of the elastic member 8a by press-fitting a fluid into the void portion 8b.
In the present embodiment, the air pipe 10 is connected to the gap portion 8b, and the elastic member 8a is expanded by press-fitting air into the gap portion 8b through the air pipe 10, or The air in the portion 8b is discharged to restore the elastic member 8a to its original shape.
Then, the slit 3 is completely closed by the volume of the expansion of the elastic member 8a so that the paste cannot flow through the slit 3, and the paste is prevented from naturally flowing out from the inside of the die 1.

For example, instead of using the elastic member 8a, a metal dam member or the like can be slid back and forth to dam the inside of the slit 3, but in this case, the dam member is slid. Therefore, it is necessary to secure a minute gap on the side surface between the weir-like member and the shim 2 and it is impossible to completely prevent the paste from flowing out. Further, there is a possibility that the slit surface 3a is damaged by the weir-like member.
On the other hand, if the elastic member 8a is used to dam the inside of the slit 3, the elastic member 8a expands so as to close a minute gap on the side surface side with the shim 2 and thus completely prevents the paste from flowing out. In addition, the slit surface 3a is not damaged. That is, it is preferable to use the elastic member 8a as a member for damming the slit 3.

That is, the stopper 8 includes an elastic member 8a that is a damming member made of an elastic body and an air pipe 10 that is a damming member expansion means for expanding the elastic member.
Thereby, the slit 3 can be dammed without a gap without damaging the inside of the slit 3, and the outflow of the paste can be surely prevented.
The elastic member 8a is formed of a hollow rubber member, and the dam member expansion means is formed of an air pipe 10 that supplies air to the elastic member 8a. Naturally flowing out can be easily prevented with a simple configuration.

In this embodiment, air is pressed into the elastic member 8a. However, the type of fluid to be pressed into the stopper 8 according to the present invention is not limited, and a configuration using a liquid such as water or hydraulic oil is used. It is also possible. Moreover, it is also possible to use a configuration in which the elastic member is elastically deformed in the slit 3 to dam the inside of the slit 3 by mechanically pressing the elastic member using a non-hollow elastic member.
In the present embodiment, the elastic member 8a is made of a rubber member. However, the material of the elastic member 8a is not limited to this, and there is appropriate elasticity, which affects the physical properties of the paste. It is possible to select an appropriate material.

Next, a procedure for performing air bleeding will be described.
As shown in FIG. 5, the conventional die 31 does not have the air vent hole 7 and there is no escape space for the air in the manifold 32. Therefore, the air and paste supply piping existing in the manifold 32 before the paste is supplied. The air and the like accumulated in 33 remained in the upper part of the manifold 32. For this reason, the air staying in the manifold 32 is irregularly released by the paste, and the air is irregularly discharged from the slit 34 together with the paste, so that there is a problem that stable coating cannot be performed.

As shown in FIG. 6, the die 1 according to the present invention is configured to include an air vent hole 7.
An air vent pipe 12 communicates with the air vent hole 7, and a stop valve 13 is provided in the middle of the air vent pipe 12.
At the start of air bleeding, the stop valve 13 is in an “open” state, and the stopper 8 described above is in a “closed” state (that is, a state in which the elastic member 8a is expanded).
From this state, when the paste is supplied into the manifold 5 through the paste supply pipe 11 connected to the supply port 6, the paste fills the manifold 5, and then flows upward on the air vent hole 7 side. Go. At this time, the air that has been present in the manifold 5 from the beginning of the paste supply or the air that has accumulated in the paste supply pipe 11 is expelled by the supplied paste and is discharged through the air vent hole 7. Since air stays upward due to its nature, the air can be effectively expelled from the manifold 5 by communicating the air vent hole 7 with the topmost part (the top part 2 b) of the manifold 5.

Then, at the end of the air bleeding, the paste discharged from the air bleeding pipe 12 is visually confirmed, and after confirming that the discharged paste is not mixed with air, the stop valve 13 is in the “closed” state. And As a result, the manifold 5 can be filled with the paste.
By providing the stopper 8, even if the paste is supplied into the manifold 5, if the stopper 8 is in the “closed” state, it is possible to prevent the paste from flowing out naturally from the die 1, and further, the stopper If 8 is set to the “open” state, stable coating can be performed immediately.

  That is, the air vent hole 7 is configured to communicate with the topmost portion (the top portion 2 b) in the vertical direction of the manifold 5, thereby reliably preventing air from remaining inside the die 1. . Moreover, since the trouble that air is discharged irregularly can be prevented, the loss of paste and foil can be reduced.

  As shown in FIG. 7, the die 1 according to the present invention can exclude air staying in the manifold 5 by the air vent hole 7, and the paste supplied in the manifold 5 is naturally discharged by the stopper 8. It is set as the structure which can prevent flowing out, and the die | dye 1 can be used for downward coating of a paste.

That is, the die 1 according to the present invention includes a paste supply port 6, a manifold 5 communicating with the downstream side in the paste flow direction of the supply port 6, and a downstream end of the manifold 5. An open slit 7 formed at the open end of the slit 3, an air vent hole 7 that communicates the manifold 5 with the outside of the die 1, and the manifold 5 A stopper 8 is provided between the discharge ports 4 to prevent the paste from flowing out.
This reliably prevents air from remaining inside the die 1 (particularly the manifold 5) and prevents the paste from naturally flowing out of the die 1. This also allows downward coating with the die 1 regardless of the viscosity of the paste.

  In addition, the downward direction described in this description is not limited to the case where the arrangement configuration of the die 1 is a mode in which the slit 3 is directed vertically downward, and depending on the viscosity of the paste, the paste flows out naturally without the stopper 8. It is also assumed that the arrangement configuration that can result in a state of being lost. That is, for example, even if the arrangement configuration of the die 1 is such that the slit 3 is directed horizontally or horizontally, or the arrangement configuration of the die 1 is directed slightly upward, the viscosity of the paste is low and naturally In the case where the paste flows out from the slit 3, it is effective to provide the stopper 8 according to the present invention.

Next, the front and back simultaneous coating system will be described.
As shown in FIG. 8, in the conventional coating system, since downward coating was difficult, in order to apply on both surfaces (front and back) of the foil, two upward coating dies 31a. 31b was used. In this case, first, coating on one side (surface) is performed by the upward coating die 31a, and then the product is passed through the first heater 35 and dried. After that, it was necessary to apply the other surface (back surface) with the upward coating die 31b, and then again pass through the second heater 36 to dry.

  On the other hand, as shown in FIG. 9, when the die 1 according to the present invention is used, downward coating is possible. Therefore, by using the die 1 in combination with the upward coating die 31, the front surface and the back surface can be coated. It becomes possible to perform coating simultaneously. In this case, since the drying process can be completed once, the heater 14 can be configured to have only one system. Therefore, by using the die 1 according to the present invention, the coating line can be shortened, and effects such as contributing to a reduction in the installation space of the coating apparatus can be achieved.

1 is an assembled perspective view showing the overall configuration of a die according to an embodiment of the present invention. The A direction arrow view in FIG. 1 similarly. Similarly side sectional drawing. The partial expanded side sectional view which similarly shows the structure of a stopper. Side sectional drawing which shows the structure of the die | dye in the past. The perspective view which shows the structure of the die | dye which concerns on one Example of this invention. The schematic diagram which shows the downward coating condition by the die | dye which concerns on one Example of this invention. The schematic diagram which shows the whole front-and-back coating system whole structure. The schematic diagram which shows the whole structure of the front and back simultaneous coating system which concerns on one Example of this invention.

Explanation of symbols

1 Die 1a Front Die 1b Rear Die 2 Shim 3 Slit 4 Discharge Port 5 Manifold 6 Supply Port 7 Air Vent Hole 8 Stopper

Claims (4)

A paste supply port;
A manifold communicating with the downstream side in the flow direction of the paste at the supply port;
A slit communicating with the downstream side of the manifold and having an open downstream end;
A paste coating die having a discharge port formed at the open end of the slit,
Forming an air vent hole communicating the manifold and the outside of the die; and
A stopper for preventing the paste from flowing out between the manifold and the discharge port is provided.
A paste coating die characterized by that. The air vent hole,
Communicating with the top of the manifold in the vertical direction,
The paste coating die according to claim 1. The stopper,
A damming member made of an elastic body;
It is constituted by a dam member expansion means for expanding the dam member.
The paste coating die according to claim 1 or 2, wherein the die is used for paste coating. The damming member,
It is composed of a hollow rubber member, and
The dam member expansion means,
It is constituted by air supply means for supplying air to the rubber member.
The paste coating die according to claim 3.

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