JPH07195014A - Die-type blade coater - Google Patents

Abstract

PURPOSE:To form a smooth coating film uniform in thickness even with a viscous coating soln. by applying a paint on a material to be treated from a liq.-permeable sheet projecting from the slot of a die block and adjusting the distance between the sheet and the material, with a control member. CONSTITUTION:The die main body 2 of a blade coater 1 is formed by connecting two die blocks 3 and 4, and a slot 5 with the specified width communicating with the external space is formed at the boundary part between the two die blocks. A manifold 6 as a liq. feed means is formed in one die block 3, and a coating soln. feed hole 7 is communicated. with the manifold. A hollow elastic body 9 as an elastic presser member is furnished to the other die block 4 on the slot 5 side of a supporting block 8, and a fixing block 10 is connected to the supporting block 8 through a movable shaft 11 as an adjusting member. A liq.-permeable sheet 12 is provided to the slot 5 and clamped by the die blocks 3 and 4. A coating soln. 19 from a feeder 18 is supplied on a material 17 to be treated through the sheet 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die type blade coater for continuously coating a belt-shaped metal plate, film, paper, glass or the like which is continuously conveyed.

[0002]

2. Description of the Related Art Conventionally, a manifold and a slot for connecting the manifold and an external space are provided between two die blocks, and the coating liquid supplied to the manifold is discharged through the slot. A die coater for coating a belt-shaped material to be processed which is conveyed near the outlet is known.

[0003]

In the die coater, it is necessary to properly control the gap between the slot outlet and the material to be treated (that is, the coater gap).
If this coater gap is expanded, paint spillage will occur and the film thickness will become unnecessarily large. In general, the coater gap is set to about 0.05 mm, but the surface shape of the material to be processed such as strip is not always constant, and if the material to be processed is deformed such as bulging, this deformed portion will cause a slot. There was a problem of contact with the outlet and damage. Further, even when the bulge of the material to be processed does not come into contact with the slot outlet, there is a problem that the coater gap is different between the portion facing the bulge and the other portion, resulting in uneven film thickness.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a die type blade coater according to claim 1 has two die blocks facing a material to be treated and these die blocks. A first liquid-permeable sheet that is sandwiched between and has one end protruding from the die block; a coating liquid supply unit that supplies a coating liquid to the first liquid-permeable sheet between the two die blocks; 1. An elastic pressing member disposed in the vicinity of the protruding portion of the liquid permeable sheet 1, a holding member that arranges the liquid permeable sheet along the outer shape of the elastic pressing member, and a liquid permeability supported by the pressing member. An adjusting member for moving the sheet portion forward and backward toward the material to be processed.

A die-type blade coater according to claim 1 or 2 has two die blocks facing a material to be treated, and a first liquid-permeable sheet sandwiched between these die blocks and having one end protruding from the die block. A coating liquid supply means for supplying a coating liquid to the first liquid-permeable sheet between the two die blocks, and an elastic pressing member arranged in the vicinity of the projecting portion of the first liquid-permeable sheet, It is held by an elastic holding member,
The first liquid-permeable sheet is composed of a coating liquid-permeable sheet in contact with the protruding portion, and an adjusting member for moving the coating liquid-permeable sheet supported by the elastic pressing member toward and away from the material to be treated. It is a thing.

[0006] In these die type blade coaters, a second liquid-permeable sheet disposed between two die blocks and having one end protruding from the die block, the first liquid-permeable sheet and the second liquid-permeable sheet. You may provide the partition plate arrange | positioned between liquid-permeable sheets, and the 2nd coating liquid supply means which supplies a coating liquid to a 2nd liquid-permeable sheet between said two die blocks. In the case of a multi-layer coating die coater with three or more layers, the second
Of the liquid-permeable sheet, partition plate, and second coating liquid supply means of
That will increase.

[0007]

In the die type blade coater according to claim 1,
The protruding portion of the first liquid-permeable sheet supported by the elastic pressing member by the adjusting member is kept in a non-contact state with the material to be processed with a very small gap therebetween. Therefore, when the coating liquid is supplied from the coating liquid supply means to the first liquid-permeable sheet sandwiched between the two die blocks, the coating liquid causes a minute gap between the first liquid-permeable sheets. It travels to the protrusion and is applied to the material to be treated.

In the die type blade coater according to the first or second aspect, the liquid-permeable sheet for coating supported by the pressing member by the adjusting member is kept in a non-contact state with the material to be treated with a very small gap therebetween. Be done. Therefore, the coating liquid supplied to the first liquid-permeable sheet between the die blocks by the coating liquid supply means is sent to the projecting portion through the minute gap of the first liquid-permeable sheet, where it is applied. After being delivered to the liquid-permeable sheet, it is applied to the material to be treated.

Further, in the blade coater in which the second liquid permeable sheet is arranged between the die blocks, the second coating liquid is supplied to the second liquid permeable sheet by the second coating liquid supply means, which is the second liquid permeable sheet.
Is coated on the material to be treated at the protruding portion of the liquid permeable sheet. Therefore, the two types of coating liquids supplied from the first liquid permeable sheet and the second liquid permeable sheet are applied to the material to be treated in an overlapping manner.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention, and a die main body 2 of a single-layer coating type blade coater indicated by reference numeral 1 as a whole.
Is formed by integrally connecting two die blocks 3 and 4 each having a substantially trapezoidal cross section with a fixing bolt (not shown). The boundary between these die blocks 3 and 4 has a predetermined width communicating with the external space. The slot 5 is formed.

A coating liquid supply means, that is, a manifold 6 is formed on one of the die blocks 3 so as to face the slot 5, and a coating liquid supply hole 7 communicates with the manifold 6. The other die block 4 includes a support block 8 disposed near the outlet of the slot 5, an elastic pressing member such as a rubber tube or a hollow elastic body 9 disposed on the slot side of the support block 8, and a fixed block 10. An adjusting member or a movable shaft 11 for connecting the support block 8 to the fixed block 10 is provided.

Further, a liquid permeable sheet 12 such as a wire mesh, a woven cloth or a non-woven cloth is arranged in the slot 5.
It is held between two die blocks 3 and 4. One end side of the liquid permeable sheet 12 projects from the slot 5, and the projecting portion 13 thereof is the hollow elastic body 9 and the support block 8.
A spring 14, which passes through the outside of the
It is connected to the fixed block 10 via a fixed shaft 15.

The wire mesh used for the liquid permeable sheet 12 is preferably 50 to 200 mesh, more preferably 70 to 150 mesh. Also, the wire mesh to be placed in the slot 5 may be only one sheet, a plurality of sheets may be placed in a stacked manner, or one sheet may be placed in a folded state, and a film of the coating material applied to the material to be treated. An appropriate mesh and thickness are selected according to the thickness, the amount of coating liquid discharged, and the like.

In the die main body 2 having the above-described structure, the liquid permeable sheet 12 portion wound around the hollow elastic body 9 is arranged diagonally from above to the material 17 to be processed which conveys the outer peripheral surface of the backup roller 16. Further, the movable shaft 11 is operated to move the support block 8 to bring the liquid-permeable sheet protruding portion 13 closer to the material to be treated 17. The contact pressure and contact width (nip width) at this time can be adjusted by operating the movable shaft 11, and the liquid permeable sheet 2 and the material to be treated 17 are not in contact with each other with a very small gap therebetween. To state. The movable shaft 1
It is desirable to provide several 1 in the width direction of the support block 8, but in order to make the smoothness of the hollow elastic body 9 more uniform,
It is also possible to provide a large number of minute pressing adjustment screws (not shown) at equal intervals in the width direction of the support block 8 and adjust the partial pressing force to the hollow elastic body 9 with each screw. Further, the coating liquid supply hole 7 is connected to the coating liquid supply device 18 by piping.

As a result, the coating liquid 19 supplied from the coating liquid supply device 18 to the coating liquid supply hole 7 is distributed by the manifold 6. Next, the coating liquid 19 passes through the minute gaps of the liquid-permeable sheet 12, is sent to the protrusion 13 while being pressure-equalized, and is conveyed in the direction of the arrow X1 based on the rotation of the backup roller 16 to be treated 17. Applied to. The coating liquid 19 sent to the projecting portion 13 is sent to the front end side through the minute gap of the liquid-permeable sheet 12 by the capillary phenomenon, and does not spill from the projecting portion 13.

As described above, in the blade coater 1 of the present invention, the coating liquid 19 is stably and continuously supplied along the minute gaps of the liquid-permeable sheet 12, like the brush. Further, since the coating liquid 19 leached from the liquid permeable sheet 12 is applied to the material 17 to be treated, the smoothness of the coating film similar to a wire bar coater and the uniformity of the coating liquid similar to a blade coater can be obtained. Further, even if the material to be treated 17 has a bulge, the bulge is absorbed by the deformation of the hollow elastic body 9, so that a uniform coating property can be secured.

FIG. 2 shows a second embodiment in which the blade coater of the first embodiment is improved, and the blade coater 2 shown in this drawing.
In the case of 0, the liquid-permeable sheet 2 for application is provided around the hollow elastic body 21.
2 are arranged. Further, one end of the liquid-permeable sheet 22 for application is fixed to the support block 23, and the other end side is connected to the fixed block 26 via the spring 24 and the fixed shaft 25. By operating the movable shaft 27, The coating liquid-permeable sheet 22 can be moved back and forth with respect to the material 28 to be processed. Furthermore, two die blocks 29, 3
One end side of the coating liquid supplying liquid-permeable sheet 32 held in the slot 31 between 0 is projected by a predetermined length, and the protruding portion 33 is in contact with the outer peripheral surface of the coating liquid-permeable sheet 22. . The coating liquid-permeable sheet 22 and the coating liquid supplying liquid-permeable sheet 32 may be made of the same material, or the coating liquid supplying liquid-permeable sheet 32 is suitable for supplying the coating liquid. The coating liquid-permeable sheet 22 may be selected to be suitable for the coating property of the material to be treated 28.

According to this blade coater 20, the coating liquid 36 supplied to the coating liquid supply hole 34 is distributed by the manifold 35, penetrates into the minute gaps of the liquid-permeable sheet 32 for supplying the coating liquid, and protrudes 33. Is supplied to the coating liquid-permeable sheet 22. In addition, the coating liquid 36 that has permeated the coating liquid-permeable sheet 22.
Moves based on the capillary phenomenon, and the liquid-permeable sheet for application 22
And is applied to the material to be processed 28 moving in the direction of the arrow X2 in the vicinity of the material to be processed 28.

FIG. 3 shows a third embodiment as a representative example of the multi-layer coating type blade coater of the present invention, which shows a two-layer coating type blade coater generally designated by reference numeral 40, showing two die blocks 41, 42. The slot 43 is formed at the boundary. In addition, the die blocks 41 and 42 have slots 4
3, manifolds 44 and 45 facing each other are formed, and the manifolds 44 and 45 have coating liquid supply holes 46,
47 communicates.

The slot protrusion 49a of the liquid permeable sheet 49 is arranged around the hollow elastic body 54 and is connected to the fixed block 55 via the spring 57 and the fixed shaft 58. The other liquid-permeable sheet 48 and the partition plate 50 are extended to the vicinity of the material 63 to be processed. In this blade coater 40, the coating liquid 61 that has penetrated into the liquid-permeable sheet 48 is
The material 63 is applied at the tip of the sheet. Further, the coating liquid 62 that has penetrated into the other liquid-permeable sheet 49 comes into contact with the material 63 to be processed which moves in the direction of arrow X3 at the portion supported by the hollow elastic body 54, and is coated over the coating liquid 61. To be done.

FIG. 4 shows a fourth embodiment in which the two-layer coating type blade coater of the third embodiment is improved, and in this blade coater 40 ', two slots of the coating liquid supplying liquid-permeable sheet 48, 49 are arranged via a partition plate 50.
Further, one end portions of the coating liquid supply liquid-permeable sheets 48, 49 are extended to the manifolds 44, 45, and between the throttle blocks 51, 52 closing the manifolds 44, 45 and the side walls of the manifolds 44, 45. Being held in. The other end of one coating liquid supply liquid-permeable sheet 48 is located at the outlet of the slot 43, and the other end of the other coating liquid supply liquid-permeable sheet 49 is a predetermined length from the slot 43. It is protruding.

At the tip of the die block 42, a support block 53 and the support block 5 are provided, as in the second embodiment.
The hollow elastic body (elastic pressing member) 54 arranged on the slot side of 3, the fixed block 55, the movable shaft 56 connecting the support block 53 to the fixed block 55, and the hollow elastic body 54 are wound around the A coating liquid-permeable sheet 59 having one end fixed to the support block 55 and the other end connected to the fixed block 55 via a spring 57 and a fixed shaft 58 is provided, and the pressing provided on the other die block 41 is provided. Board 60
Thus, the protruding portion of the coating liquid supplying liquid-permeable sheet 49 protruding from the slot 43 is brought into contact with the coating liquid-permeable sheet 59.

Blade coater 4 having such a configuration
At 0 ', the coating liquid 6 supplied from the coating liquid supply holes 46 and 47
1, 62 are distributed by the manifolds 44, 45 respectively, penetrate into the minute gaps of the coating liquid supply liquid-permeable sheets 48, 49, and move along the slots 43, respectively. Further, the coating liquids 61 and 62 leached from the tips of the coating liquid supply liquid-permeable sheets 48 and 49 are respectively applied to the coating liquid-permeable sheet 5.
9 is supplied in a two-layer state, and the coating liquid 61 serves as a lower layer and the coating liquid 62 serves as an upper layer, and is applied to the material 63 to be processed which moves in the direction of arrow X4.

FIG. 5 shows a fifth embodiment in which the two-layer coating type blade coater of the fourth embodiment is improved. In this blade coater 40 '', the partition plate 50 is not arranged up to the outlet of the slot 43, Two liquid-permeable sheets 48 and 49 are in contact with each other inside the 43. In this case, the coating liquids 61 and 62 moving in the gap between the liquid-permeable sheets 48 and 49 come into contact with each other when they reach the non-existing region of the partition plate 50, but these coating liquids 61 and 62 are respectively liquid-permeable. Seat 48,4
Do not move 9 and mix. Therefore, the arrow X
The coating liquid 61 is applied to the lowermost layer 63 and the coating liquid 62 to the upper layer of the material 63 that moves in the five directions without color mixing.

FIG. 6 shows a sixth embodiment in which the two-layer coating type blade coater of the fifth embodiment is improved. In this blade coater 40 "', the liquid-permeable sheets 48, 49 and the partition plate 5 are used.
0 protrudes equidistantly from the slot 43, the tips of one liquid-permeable sheet 48 face each other with a minute gap of the material 63 to be processed, and the other liquid-permeable sheet 49 serves as a coating liquid-permeable sheet 59. Are in contact. Therefore, the liquid-permeable sheet 48
The coating liquid 61 sent through the liquid is applied to the material 63 to be treated at its tip portion, and the coating liquid 62 sent through the liquid permeable sheet 49 is transferred via the coating liquid permeable sheet 59. It is applied to the processing material 63. Further, since the liquid-permeable sheets 48 and 49 are separated by the partition plate 50 up to their leading ends, the coating liquids 61 and 62 do not mix with each other, and color mixing can be reliably prevented.

In the above description, the single-layer coating type blade coater and the two-layer coating type blade coater have been described, but a partition plate and a liquid-permeable sheet are appropriately arranged between the die blocks, and these liquid-permeable sheets are also provided. By providing a means for supplying the coating liquid to the, for example, a manifold, three layers,
A 4-layer multi-layer coating type blade coater is obtained. In this case, in the three-layer coating type blade coater, in addition to the first liquid-permeable sheet and the first coating liquid supply means, there are two second liquid-permeable sheets, two partition plates and a second partition plate. There are two sets of coating liquid supply means, and in a four-layer coating type blade coater, there are three
There will be 3 sets.

Further, in the above description, the hollow elastic body is pressed against the material to be processed through the support block by adjusting the movable shaft, but it is deformed by supplying compressed air to the hollow elastic body. Therefore, the contact pressure, the nip width, or the gap between the liquid-permeable sheet and the material to be processed may be adjusted.

[0028]

As is apparent from the above description, according to the die type blade coater of the present invention, the liquid-permeable sheet protruding from the slot of the die block or the coating liquid is supplied from this liquid-permeable sheet. The coating material is applied to the material to be processed by another liquid-permeable sheet. Further, the interval between the liquid-permeable sheet and the material to be processed can be accurately adjusted by the adjusting member. Therefore, even when a high-viscosity coating liquid is used, a coating film having a smooth and uniform thickness can be obtained, and uniform coating properties in the width direction can be obtained. Further, since the coating liquid that has penetrated into the liquid-permeable sheet is applied to the material to be treated without dripping, it is possible to make the distance between the die body and the material to be treated wider than that of the conventional die coater. The bulge does not contact the die body and get damaged.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a single-layer coating die coater according to a first embodiment.

FIG. 2 is a vertical sectional view of a single-layer coating die coater according to a second embodiment.

FIG. 3 is a vertical sectional view of a two-layer coating die coater according to a third embodiment.

FIG. 4 is a vertical sectional view of a two-layer coating die coater according to a fourth embodiment.

FIG. 5 is a vertical sectional view of a two-layer coating die coater according to a fifth embodiment.

FIG. 6 is a partially enlarged sectional view of a two-layer coating die coater according to a sixth embodiment.

[Explanation of symbols]

1 ... Single layer coating type blade coater, 2 ... Die body, 3, 4
… Die blocks, 5… Slots, 6… Manifolds, 7
... Coating liquid supply hole, 8 ... Support block, 9 ... Hollow elastic body, 1
0 ... Fixed block, 11 ... Movable shaft, 12 ... Liquid-permeable sheet, 19 ... Coating liquid

Claims (3)

[Claims] 1. A die type coater for applying a coating liquid onto a material to be treated, and two die blocks facing the material to be treated.
A first liquid-permeable sheet sandwiched between the die blocks and having one end protruding from the die block; and a coating liquid supply means for supplying a coating liquid to the first liquid-permeable sheet between the two die blocks. An elastic pressing member disposed in the vicinity of the protruding portion of the first liquid-permeable sheet, a holding member for disposing the first liquid-permeable sheet along the outer shape of the elastic pressing member, and the pressing member. A die-type blade coater comprising: a supported first liquid-permeable sheet portion and an adjusting member for moving the first liquid-permeable sheet portion toward and away from the material to be treated. 2. A die type coater for applying a coating liquid to a material to be treated, two die blocks facing the material to be treated,
A first liquid-permeable sheet sandwiched between the die blocks and having one end protruding from the die block; and a coating liquid supply means for supplying a coating liquid to the first liquid-permeable sheet between the two die blocks. An elastic pressing member disposed in the vicinity of the protruding portion of the first liquid-permeable sheet, and a coating liquid-permeable sheet held by the elastic pressing member and in contact with the protruding portion of the first liquid-permeable sheet, An adjusting member for advancing and retracting the coating liquid-permeable sheet supported by the elastic pressing member toward the material to be treated,
A die type blade coater characterized in that 3. Arranged between the two die blocks,
A second liquid-permeable sheet having one end protruding from the die block, a partition plate disposed between the first liquid-permeable sheet and the second liquid-permeable sheet, and a second plate between the two die blocks. Two
2. A die type blade coater according to claim 1 or 2, further comprising: a second coating liquid supply unit that supplies the coating liquid to the liquid permeable sheet.