JP2004305955A - Slot die and slot die coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slot die coater capable of suppressing the formation of a high shoulder at edges with a simple and low-cost means. <P>SOLUTION: The slot die 11 is constituted by vertically piling an upper block 12A and a lower block 12B. Shims 13A and 12B are interposed between the upper block 12A and the lower block 12B at both end parts of the slot die 11. A slot 15 which is demarcated by a bottom surface of the upper block 12A, an upper surface of the lower block 12B, and side surfaces of the shims 13A, 13B is formed. The side surfaces of the shims 13A, 13B forming both side walls of the slot 15 are worked each into a tapered shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

なお、耳高範囲は耳高部の幅であり、盛り上がり率（％）は次の式により計算される。
盛り上がり率（％）＝ΔＹ／Ｙ０×１００
ΔＹ＝（耳高ピーク高さ）―（平均厚さＹ０）
【００４４】
以上のように、比較例１のスロットダイを用いたときには、盛り上がり率が２１．０％であったものが、第１の実施形態に対応する実施例１では、５．７％にまで低減されている。また、比較例１では耳高範囲は３．２ｍｍであったが、実施例１では計測できない程度まで改善されていた。
【００４５】
また、実施例２は、第３の実施形態の構成に対応し、スロットの両側にそれぞれテーパー加工されたシムが３枚重ねて配置された。実施例２のシムのテーパ−角度は２０°であり、シムの厚さは２００μｍである。また、各シムは２．０ｍｍづつ階段状にずらされた。一方、比較例２では従来の矩形断面を有する厚さ６００μｍのシムが用いられた。なお、実施例２及び比較例２では、塗布液に、粘度２０００ｍＰａ・ｓ（２５°Ｃにおいて）、固形分濃度６５重量％のポリマー溶液が用いられ、塗布ギャップ０．０７ｍｍの下、乾燥後の塗布量（平均塗膜厚さ）が４６μｍになるように給液された。このときの乾燥後の結果を表２に示す。
【表２】

【００４６】
以上のように、比較例２のスロットダイを用いたときには、盛り上がり率が４０．５％であったものが、第３の実施形態に対応する実施例２では、７．６％にまで低減された。また、比較例２では耳高範囲は９．３ｍｍであったが、実施例２では４．２ｍｍにまで改善されていた。
【００４７】
なお、本実施形態では、スロットの断面形状は台形や、階段状であったが、スロット断面の端部の形状はこれらに限定されるものではなく、スロットの両端の塗布液供給量を抑制し耳高の発生を抑制できる断面形状であれば如何なる形状であっても構わない。例えばＶ字形やＵ字形であってもよい。
【００４８】
【発明の効果】
以上のように、本発明によれば、スロットダイ塗布装置において、簡単かつ低コストで耳高の発生を抑制することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態であるスロットダイ塗布装置に適用されるスロットダイの斜視図である。
【図２】図１のスロットダイが適用されたスロットダイ塗布装置の一部を模式的に示す側面断面図である。
【図３】従来のスロットダイを用いてウェブ上に形成された塗布膜の横断面図である。
【図４】従来のスロットダイをリップ面側から見た正面図である。
【図５】第１の実施形態におけるスロットのリップ面の正面図である。
【図６】第２の実施形態におけるスロットのリップ面の正面図である。
【図７】第３の実施形態におけるスロットのリップ面の正面図である。
【図８】変形例のスロットダイの模式的な側断面図である。
【図９】第４の実施形態であるスロットダイ塗布装置の一部を模式的に示す側面断面図である。
【図１０】第５の実施形態であるスロットダイ塗布装置の一部を模式的に示す側面断面図である。
【符号の説明】
１０ スロットダイ塗布装置
１１ スロットダイ
１２Ａ 上部ブロック
１２Ｂ 下部ブロック
１４ リップ
１５ スロット
１３Ａ、１３Ｂ シム
４０Ａ、４０Ｂ、４１Ａ、４１Ｂ シム
４２Ａ、４２Ｂ、４３Ａ、４３Ｂ シム
Ｆ 塗布膜
Ｗ 塗布基材（ウェブ）
Ｐ 塗布基材（平板状基板）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coating apparatus and a coating method for applying a coating liquid to a coating substrate such as a continuously running belt-like web such as paper, cloth, plastic film, or metal foil, or a flat substrate such as a glass substrate.
[0002]
[Prior art]
2. Description of the Related Art As a coating apparatus that applies a coating liquid to a continuously running belt-shaped web or flat substrate, a pre-metering coating type die coating apparatus is known. In a die coating apparatus of a pre-metering coating method, all coating liquids measured in advance are all coated on the surface of a coating substrate, and the thickness of the coating film is regulated by the die. As a die coating device, a slot die, a slide die, a curtain die and the like are known. The die coating apparatus does not scrape and recirculate excess coating liquid, so that a stable coating film can be formed without being affected by changes in the composition of the coating liquid over time.
[0003]
For this reason, for example, slot die coating apparatuses are widely used in fields such as manufacturing of high value-added products related to electronic materials and optical functional materials, and high precision coating. For this reason, the rheology of the coating solution, the coating thickness, the coating film accuracy, the manufacturing conditions, and the like have come to be diverse.
[0004]
Therefore, for example, when the coating liquid is a non-Newtonian fluid (especially a viscoelastic fluid) or when the affinity between the coating liquid and the coating substrate is poor, bulges (hereinafter referred to as ear heights) occur at both ends of the coating film. May be. The occurrence of ear height is not only a problem in appearance, but also causes various problems. For example, the ear height significantly increases the drying load, so that the ear height may be insufficiently dried, and the undried portion may contaminate the web or roll in a nip process or the like, and the web may have wrinkles. appear. In addition, when the strip-shaped web having the raised ears is wound, stress is concentrated on the stacked ear portions, and the web may be broken. This is particularly noticeable in long winding. These things reduce the production efficiency and yield of the product.
[0005]
As a method of preventing the ear height, for example, an inclined slit method having an inclined shape in which a slit width increases toward a slit outlet has been proposed (see Patent Document 1). However, in such an inclined slit method, in the recent diversification of the coating liquid, the widening of the coating amount (coating thickness), the high-precision coating, and the high-speed coating, the allowable range of the coating amount accuracy is limited. Cannot be satisfied.
[0006]
[Patent Document 1]
JP-A-2002-254006
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to suppress generation of ear height easily and at low cost in a slot die coating apparatus.
[0008]
[Means for Solving the Problems]
(1) A slot die according to claim 1 of the present invention is a slot die used in a slot die coating apparatus and provided with a slot for supplying a coating liquid to a coating substrate, wherein the slot is formed on the coating substrate. The cross section of the slot facing and facing the application base material is characterized by being formed in a shape that relatively suppresses the supply of the application liquid at both ends.
[0009]
(2) The slot die has an upper block and a lower block, and both side walls of the slot are formed by interposing one or more shims at both ends of the upper block and the lower block in parallel with the exit direction of the slot. Is done.
[0010]
(3) The side surface of the shim is formed into a tapered shape, and the tapered surface formed into the tapered shape forms both side walls.
[0011]
(4) A plurality of shims having different widths are interposed at both ends of the slot, and both side walls are formed by disposing the plurality of shims in a stepwise manner.
[0012]
(5) The slot die coating apparatus according to claim 5 of the present invention includes a slot die in which a slot for supplying a coating liquid to the coating substrate is formed, and the slot faces the coating substrate. It is characterized in that the cross section of the slot facing the base material is formed in a shape that relatively suppresses the supply of the coating liquid at both ends.
[0013]
(6) The coating method according to claim 6 of the present invention includes a slot for supplying a coating liquid to the coating substrate, wherein the slot faces the coating substrate, and a cross section of the slot facing the coating substrate. However, it is characterized in that the coating film is formed in a shape that relatively suppresses the supply of the coating liquid at both ends, and a coating film in which the ear height is suppressed by suppressing the supply of the coating liquid at both ends is formed on the coating substrate. .
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a slot die applied to a slot die coating apparatus according to a first embodiment of the present invention. FIG. 2 is a side sectional view schematically showing a part of a slot die coating apparatus to which the slot die of FIG. 1 is applied. With reference to FIG. 1 and FIG. 2, an outline of a slot die coating apparatus of the present embodiment and a coating process thereof will be described.
[0015]
The slot die coating apparatus 10 of the present embodiment includes a slot die 11. The slot die 11 is configured as a horizontally long block as a whole, and has a cross section having a shape obtained by partially cutting a vertex of the home base. The slot die 11 is configured by vertically stacking upper and lower blocks 12A and 12B having substantially the same shape. That is, the upper block 12A and the lower block 12B have a substantially plane-symmetric shape with respect to a horizontal plane. Shims 13A and 13B are interposed at both ends between the upper block 12A and the lower block 12B to form a slot gap d at a predetermined interval. That is, the tip of the slot die 11 having a cross-sectional shape obtained by cutting the apex angle of the home base forms a lip 14, and the lip 14 has a horizontally elongated shape defined by the upper block 12A, the lower block 12B, and the shims 13A and 13B. A slot 15 is formed.
[0016]
A cavity 16 is formed on the upper surface of the lower block 12B, that is, the surface facing the bottom surface of the upper block 12A, along the longitudinal direction (lateral direction), and the cavity 16 communicates with the application liquid supply pipe 17 ( Not shown). The coating liquid supply pipe 17 is connected to a coating liquid supply system (not shown), and the coating liquid measured via the coating liquid supply pipe 17 is supplied to the cavity 16 at a predetermined supply amount by a fixed amount pump. That is, the application liquid in the cavity 16 is sent out to the slot 15 by the supply pressure through the gap of the slot gap d formed by the shims 13A and 13B, and is pushed out of the slot die 11 at a constant amount per unit time.
[0017]
In addition, side walls 18A and 18B having substantially the same shape as the cross section of the slot die 11 are attached to both ends of the upper block 12A and the lower block 12B, and hold the assembly of the slot die 11. Further, the gap behind the slot die 11 formed by the shims 13A and 13B, that is, the gap opposite to the slot 15 is closed by a shim (not shown), and the coating liquid does not leak out of the slot 15 and other portions. .
[0018]
In the first embodiment, the slot die 11 is arranged adjacent to the coating base material W which is a web strip. The slot die 11 is disposed with the tip of the lip 14 facing the coating substrate W, and the slot 15 and the coating substrate W are separated by a predetermined coating gap D. In FIG. 2, the slot die 11 is arranged in the horizontal direction, but the slot die 11 may be installed in any direction as long as it faces the application surface.
[0019]
The coating liquid sent out from the slot 15 forms a coating bead along the slot 15 between the coating base material W and the slot 15, and when the coating base material W is sent out along with the rotation of the coating roll 20, the coating base is formed. A coating film F is formed on the surface of the material W with a width of the slot 15 and a substantially constant thickness.
[0020]
Next, the ear height phenomenon of the coating film formed on the coating substrate W will be described with reference to FIGS. FIG. 3 is a cross-sectional view of a coating film formed on a web using a conventional slot die. FIG. 3 (a) shows a normal case without ear height, and FIG. 3 (b) shows a sharp case. FIG. 3C shows the case where the ear height is formed and the case where the broad ear height is formed. FIG. 4 is a front view of a conventional slot die as viewed from the lip surface side.
[0021]
As shown in FIG. 4, the conventional slot die 30 is also configured to be surrounded by the upper block 12A, the lower block 12B, and the side walls 18A and 18B, similarly to the slot die 11 of the present embodiment. Also, between the upper block 12A and the lower block 12B, shims 31A and 31B are arranged and interposed in the same manner as the slot die 11 of the present embodiment. However, since the shims 31A and 31B used in the conventional slot die 30 have a rectangular cross section (a cross section parallel to the lip surface 32), the bottom surface of the upper block 12A, the upper surface of the lower block 12B, and the shims 31A and 31B are formed. The cross-sectional shape of the slot 33 defined by the side surface is a horizontally long rectangle.
[0022]
In the use of the slot die 30, if the rheology of the coating liquid (for example, the viscosity of the coating liquid), the coating speed, the slot gap, the supply amount of the coating liquid, the internal pressure of the die, etc. are appropriate, as shown in FIG. The cross section of the coating film F formed on the coating substrate W has a substantially uniform thickness, and no ear height is generated. On the other hand, for example, when the viscosity of the coating liquid is high, when the slot gap is narrow, when the supply amount of the coating liquid is large (the coating film thickness is large), or when the internal pressure of the die is high, FIG. A sharp ear height B1 having a high peak and a narrow skirt as shown in FIG. In addition, for example, when the viscosity of the coating liquid is low, when the slot gap is wide, when the supply amount of the coating liquid is small (the coating film thickness is small), or when the internal pressure of the die is low, FIG. As described above, the broad ear height B2 having a low peak and a wide bottom occurs at both ends of the coating film F. These phenomena become remarkable when the coating liquid is a non-Newtonian fluid, particularly a viscoelastic fluid.
[0023]
Next, the shape of the slot of the first embodiment and the cross-sectional shape of the shim that defines the slot will be described with reference to FIG. FIG. 5 is a front view of the lip surface 32 of the slot die 11, and the upper side is the traveling direction of the coating substrate W.
[0024]
The shims 13A and 13B are interposed in parallel with the exit direction of the slots, and the side surfaces defining the slots 15 are each inclined at a predetermined angle. That is, one side surface of each of the shims 13A and 13B is formed into a tapered shape at a predetermined angle, and its cross section is a flat trapezoid whose one side is inclined at a predetermined angle. Note that the inclined side surfaces of the shims 13A and 13B face each other and are disposed at both ends of the slot 15, and at both ends of the slot 15, regions having a wedge-shaped cross-sectional shape are formed. In FIG. 5A, the shims 13A and 13B are arranged such that both ends of the slot 15 have a C shape. In FIG. 5B, the shims 13A and 13B are arranged so that both ends of the slot 15 are inverted C-shaped. The slot cross section in FIG. 5B is obtained by arranging the shims 13A and 13B in FIG.
[0025]
The side surfaces of the tapered shims 13A and 13B form both side walls of the slot 15, and the trapezoidal cross-sectional shape of the slot 15 facing the application base material W (that is, toward the rotation axis L0 of the coating roll 20). Then, the cross-sectional area (channel area) at both ends (wedge-shaped regions) of the slot 15 becomes smaller than that at the center. Therefore, the amount of the coating liquid projecting from the slot 15 decreases at both ends of the slot 15. In the slot die 11 of the present embodiment, the amount of the coating liquid that forms the ear height at both ends when the conventional slot die 30 is used is restricted at both ends of the slot 15, and the coating liquid is applied to the coating base material W. Supply. Accordingly, when the coating film F is formed on the coating substrate W, generation of ear height is prevented, and the coating film F having a substantially uniform thickness can be formed.
[0026]
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is the same as the first embodiment except for the configuration of the shim interposed between the upper block and the lower block that constitute the slot die. The description of the same components as those of the first embodiment is omitted, and the same components are denoted by the same reference numerals. FIG. 6 is a front view of the lip surface 32 of the slot die 11 similarly to FIG.
[0027]
In the first embodiment, one side surface of each of the shims 13A and 13B is processed into a tapered shape to control the cross-sectional area at both ends of the slot 15. However, since the thickness of the shims 13A and 13B is as thin as about 500 μm, it is difficult to reduce the angle of the tapered surface. In the second embodiment, a plurality of shims having different widths are stacked and interposed between the upper block 12A and the lower block 12B, and the respective side faces are shifted to reduce the cross-sectional area at both ends of the slot 15. Control.
[0028]
In FIG. 6, shims 40A and 41A are vertically arranged on the left side of the slot 15, and shims 40B and 41B are arranged on the right side. The set of shims 40A and 40B has the same shape and the same size, and the set of shims 41A and 41B has the same shape and the same size. The cross sections of the shims 40A, 40B, 41A, 41B (cross sections parallel to the lip surface 32) are all flat rectangles. The width of the shims 40A, 40B (the longitudinal direction of the slot die) is smaller than the widths of the shims 41A, 41B. By arranging them vertically, the side walls of the slot 15 are formed stepwise. In FIG. 6A, the narrow shims 40A and 40B are arranged on the wide shims 41A and 41B, and in FIG. 6B, the narrow shims 40A and 40B are conversely arranged with the wide shims 41A and 41B. It is arranged below 41B.
[0029]
As described above, by stacking a plurality of shims having different widths on both ends of the slot 15, the step-like side walls can be formed on both ends of the slot 15. That is, the cross-sectional area (flow path area) at both ends (step-like regions) of the slot 15 is smaller than that at the center, and the amount of the coating liquid protruding from the slot 15 is smaller at both ends of the slot 15. . As a result, similarly to the first embodiment, when the coating film F is formed on the coating base material W, generation of ear height is prevented, and the coating film F having a substantially uniform thickness can be formed.
[0030]
Further, in the first embodiment, the change in the cross-sectional area at both ends of the slot is controlled by the inclination of the tapered surface, but in the second embodiment, the change is controlled by the width and the number of the shims to be overlapped. It can be provided simply and at low cost, and the cross-sectional shape can be changed more flexibly according to the type of product to be manufactured. Further, in the second embodiment, two shims are overlapped. However, when the cross section is changed more smoothly, it is possible to overlap more thin shims having different widths.
[0031]
FIG. 7 is a front view of the lip surface 32 of the slot die 11 according to the third embodiment of the present invention. The third embodiment corresponds to a combination of the first embodiment and the second embodiment, and a plurality of tapered shims are interposed between the upper block and the lower block. . That is, the shims 42A, 42B, 43A, and 43B are tapered on one side surface at a predetermined angle as in the first embodiment, and the shims 42A and 42B are narrower than the shims 43A and 43B. In FIG. 7A, the shim 42A and the shim 43A are vertically overlapped at the slot end on the left side of the figure, and the shim 42B and the shim 43B are vertically stacked at the right slot end. On the other hand, in FIG. 7B, the shim 42A and the shim 43A are stacked stepwise at the slot end on the right side of FIG. 7A upside down, and the shim 42B and the shim 43B are stacked on the left end of the slot. FIG. 7A is overlaid stepwise upside down.
[0032]
As described above, also in the third embodiment, it is possible to obtain an effect obtained by combining the first and second embodiments.
[0033]
Next, a modified example of the slot die of the present invention will be described with reference to FIG. In the first to third embodiments, the shim extends from the lip surface to the opposite back surface. However, in the modified slot die 11 ', for example, the shims 13A and 13B are interposed only in front of the cavity 16 (on the slot side). That is, in the lower block 12B ′, the upper surface on the rear side of the cavity 16 is higher than the upper surface on the front side by the slot gap d, and when the upper block 12A and the lower block 12B ′ are overlapped, the upper surface on the rear side of the lower block 12B ′ is formed. Abuts against the bottom surface of the upper right lock 12A. As a result, the slot gap d is maintained with higher accuracy.
[0034]
Next, a slot die coating apparatus according to a fourth embodiment will be described with reference to FIG. The slot die coating apparatus 10 ′ according to the fourth embodiment is obtained by applying the slot die 11 according to the first embodiment to a tension web method, and applies a coating substrate W that is a belt-shaped web that is sent out in a plane. The coating liquid is applied to the surface using the slot die 11 of the first embodiment.
[0035]
The application base material W is sent out, for example, via a roller 21 arranged on the lower side and then via a roller 22 arranged on the upper side (in FIG. 9, it is sent out upward). The slot die 11 is disposed at a position where the coating base material W is stretched in a plane between the rollers 21 and 22. The lip surface of the slot die 11, that is, the slot 15, faces the application surface of the application substrate W, and the application substrate W is sent out substantially in parallel with the lip surface. The application liquid is extruded from the slot 15 onto the application surface of the application substrate W separated by the application gap D, and the application film F is formed as the application substrate W is sent out. Note that the other configuration is the same as that of the first embodiment, and a description thereof will be omitted.
[0036]
As described above, according to the fourth embodiment, the same effects as those of the first embodiment can be obtained in the slot die coating apparatus using the tension web method.
[0037]
Next, a slot die coating apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. The slot die coating device according to the fifth embodiment is a coating device using a flat substrate P such as a glass plate as a coating base material, and the slot die 11 according to the first embodiment is used as the slot die.
[0038]
As shown in the figure, in the slot die coating apparatus 10 ″ of the fifth embodiment, a flat substrate P is mounted on a suction plate (support) 50 that is kept substantially horizontal. The position of the suction plate 50 is fixed, for example, by suction force from a number of holes (not shown) provided on the upper surface of the suction plate 50. The suction plate 50 is transferred to, for example, the left side of FIG. Thereby, the flat substrate P is also transferred to the left side in FIG.
[0039]
The slot die 11 is disposed substantially downward so that the lip surface, that is, the slot 15 is separated from the flat substrate P by the coating gap D. That is, the slot 15 is arranged so as to face the flat substrate P, and the flat substrate P is transferred substantially parallel to the lip surface. The coating liquid extruded from the slot 15 is extruded onto the coating surface of the flat substrate P, and the coating film F is formed as the flat substrate P is transferred by the transfer of the suction plate 50.
[0040]
As described above, according to the fifth embodiment, the same effects as in the first embodiment can be obtained in a slot die coating apparatus using a flat substrate such as a glass plate as a coating substrate.
[0041]
Hereinafter, the effects of the first embodiment and the third embodiment of the present invention will be described using examples along with comparative examples.
[0042]
【Example】
In each of Examples 1 and 2 and Comparative Examples 1 and 2, a 38 μm-thick polyethylene terephthalate film was used as a web substrate, and the coating speed was 25 m / min. The slot die used had a total width of 600 mm, the coating width was set to 500 mm, and the slot gap was set to 600 μm.
[0043]
Example 1 corresponds to the configuration of the first embodiment, and tapered shims are arranged on both sides of the slot one by one. The taper angle of the shim of Example 1 is 20 ° and the shim thickness is 600 μm. On the other hand, in Comparative Example 1, a conventional shim having a rectangular cross section and a thickness of 600 μm was used. In Example 1 and Comparative Example 1, a polymer solution having a viscosity of 2400 mPa · s (at 25 ° C.) and a solid content concentration of 34% by weight was used as a coating solution, and after drying under a coating gap of 0.1 mm, a coating solution was used. The liquid was supplied so that the coating amount (average coating film thickness) was 23 μm. The results after drying at this time are shown in Table 1.
[Table 1]

The ear height range is the width of the ear height part, and the climax ratio (%) is calculated by the following formula.
Surge rate (%) = ΔY / Y0 × 100
ΔY = (ear height peak height)-(average thickness Y0)
[0044]
As described above, when the slot die of Comparative Example 1 was used, the swelling rate was 21.0%, but in Example 1 corresponding to the first embodiment, it was reduced to 5.7%. ing. In Comparative Example 1, the ear height range was 3.2 mm, but in Example 1, the ear height range was improved to such an extent that it could not be measured.
[0045]
Example 2 corresponds to the configuration of the third embodiment, and three tapered shims are arranged on both sides of the slot so as to overlap each other. The taper angle of the shim of Example 2 is 20 °, and the thickness of the shim is 200 μm. Each shim was shifted in steps of 2.0 mm. On the other hand, in Comparative Example 2, a conventional shim having a rectangular cross section and a thickness of 600 μm was used. In Example 2 and Comparative Example 2, a polymer solution having a viscosity of 2000 mPa · s (at 25 ° C.) and a solid content of 65% by weight was used as a coating solution, and the coating solution was dried under a coating gap of 0.07 mm. The liquid was supplied so that the coating amount (average coating film thickness) was 46 μm. Table 2 shows the results after drying at this time.
[Table 2]

[0046]
As described above, when the slot die of Comparative Example 2 was used, the swelling rate was 40.5%, but in Example 2 corresponding to the third embodiment, it was reduced to 7.6%. Was. In Comparative Example 2, the ear height range was 9.3 mm, but in Example 2, the ear height range was improved to 4.2 mm.
[0047]
In the present embodiment, the cross-sectional shape of the slot is trapezoidal or stepped, but the shape of the end of the slot cross-section is not limited to these, and the amount of application liquid supply at both ends of the slot is reduced. Any shape may be used as long as it can suppress the generation of the ear height. For example, it may be V-shaped or U-shaped.
[0048]
【The invention's effect】
As described above, according to the present invention, in the slot die coating apparatus, generation of ear height can be suppressed easily and at low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view of a slot die applied to a slot die coating apparatus according to a first embodiment of the present invention.
FIG. 2 is a side sectional view schematically showing a part of a slot die coating apparatus to which the slot die of FIG. 1 is applied.
FIG. 3 is a cross-sectional view of a coating film formed on a web using a conventional slot die.
FIG. 4 is a front view of a conventional slot die as viewed from a lip surface side.
FIG. 5 is a front view of a lip surface of the slot according to the first embodiment.
FIG. 6 is a front view of a lip surface of a slot in the second embodiment.
FIG. 7 is a front view of a lip surface of a slot in a third embodiment.
FIG. 8 is a schematic side sectional view of a slot die according to a modification.
FIG. 9 is a side sectional view schematically illustrating a part of a slot die coating apparatus according to a fourth embodiment.
FIG. 10 is a side sectional view schematically showing a part of a slot die coating apparatus according to a fifth embodiment.
[Explanation of symbols]
Reference Signs List 10 slot die coating apparatus 11 slot die 12A upper block 12B lower block 14 lip 15 slot 13A, 13B shim 40A, 40B, 41A, 41B shim 42A, 42B, 43A, 43B shim F coating film W coating base material (web)
P Coating substrate (flat substrate)

Claims (6)

A slot die that is used in a slot die coating device and includes a slot for supplying a coating liquid to a coating substrate,
The slot die, wherein the slot faces the coating substrate, and a cross section of the slot facing the coating substrate is formed at both ends in a shape that relatively suppresses the supply of the coating liquid. . The slot die includes an upper block and a lower block, and both side walls of the slot allow one or more shims to be interposed at both ends of the upper block and the lower block, respectively, in parallel with an exit direction of the slot. The slot die according to claim 1, wherein the slot die is formed by: The slot die according to claim 2, wherein a side surface of the shim is formed into a tapered shape, and the tapered surface formed into the tapered shape forms the both side walls. A plurality of shims having different widths are interposed at both ends of the slot, and the side walls are formed by disposing the plurality of shims in a stepwise manner. The described slot die. A slot die having a slot for supplying a coating liquid to the coating substrate is provided,
The slot die, wherein the slot faces the coating substrate, and a cross section of the slot facing the coating substrate is formed at both ends in a shape that relatively suppresses the supply of the coating liquid. Coating device. A slot for supplying a coating liquid to the coating substrate is provided, wherein the slot faces the coating substrate, and a cross section of the slot facing the coating substrate controls supply of the coating liquid at both ends thereof. Forming a coating film on the coating base material, the coating film being formed in a shape that suppresses the edge height by suppressing the supply of the coating liquid at both ends.

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