KR20180037652A - Slot die having a chamber - Google Patents

Abstract

A slot die with improved chamber-like shape, which is used for slot die coating for coating by discharging ink supplied from an ink supply part, and includes a first frame, a second frame, and an interposing unit. The first frame includes: an inlet part supplied with the ink; a chamber storing the ink supplied to the inlet part; and a first outlet part provided at the bottom of the chamber to discharge the ink. The second frame includes second outlet part coupled to the first frame and facing the first outlet part. The interposing unit is interposed between the first frame and second frame to form a space between the first chamber, the first outlet part, and the second outlet part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a slot die having an improved chamber shape,

FIELD OF THE INVENTION The present invention relates to slot die, and more particularly to a slot die having an improved chamber geometry for forming a chamber therein and for performing slot die coating using organic electronic ink.

Slot die coating is a method of applying a fluid such as ink to a substrate or the like, such as an anastomosis pump or a piston pump (not shown) for supplying the fluid to the slot die 3, And a pipe 2 and a uniform amount of fluid is discharged through the end of the slot die 3 to coat the substrate 5.

Such a slot die coating can perform coating on a substrate while maintaining the composition, viscosity, temperature and the like of the liquid, can perform coating with stability and high reproducibility with a relatively simple structure, can minimize contamination, And a layer can be coated thereon.

The slot die 3 used for the slot die coating stores a fluid supplied through the pump 1. A chamber 4 for discharging the fluid is formed in the chamber. A relatively large space was formed for the storage of the water.

However, when the size of the chamber 4 is large, the amount of the ink remaining in the chamber 4 after the end of the coating process is increased, and in particular, in the case of expensive organic electronic ink, There was a problem.

In addition, in the slot die 3, it is important that the amount of ejected ink is maintained uniformly in order to improve the uniformity of the coating, and the amount of the ejected ink is determined by the shape of the chamber 4, A technique relating to an optimized chamber shape capable of uniformly maintaining the amount of ink has not been developed yet.

Korean Patent Publication No. 10-2015-0033130 Korean Patent Publication No. 10-2015-0137447

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to minimize the amount of ink remaining after coating through the optimized chamber shape and to maintain the ink discharged through the slot die more uniformly To a slot die having an improved chamber shape.

The slot die according to an embodiment of the present invention for realizing the object of the present invention includes a first frame, a second frame, and an intervening unit, which are used for slot die coating for discharging and coating ink provided from an ink supply unit. The first frame includes an inlet for receiving the ink, a chamber for storing the ink supplied to the inlet, and a first discharger for discharging the ink at a lower portion of the chamber. The second frame includes a second ejection unit coupled to the first frame and facing the first ejection unit. The interposing unit is interposed between the first and second frames to form a space between the first chamber and the first and second ejecting portions. The intervening unit includes an opening, wherein the opening includes a pair of oblique faces extending symmetrically from each other from the inlet, and a pair of perpendicular faces extending in parallel to each other from each of both ends of the oblique faces.

In one embodiment, the openings may further comprise a pair of vertical surfaces extending in parallel to each other from each of the opposite ends of the oblique surfaces extending symmetrically from the inlet.

In one embodiment, the opening may be formed with a first thickness, and a gap of a first thickness may be formed between the first and second outlets.

In one embodiment, the first thickness may be 0.1 mm.

In one embodiment, the chamber includes a first outer oblique surface formed from a center of the inlet to a first upper end point, and a second outer oblique surface formed from a center of the inlet to a second upper end point symmetrical to the first upper end point .

In one embodiment, each of the first and second outer oblique faces extends from the center of the inlet to the first and second upper endpoints and may be reduced in thickness.

In one embodiment, the first and second upper end points are spaced apart by a first width in a first direction, and each of the first and second upper end points is perpendicular to the first direction from an end of the first discharge portion And may be spaced apart by a first length in a second direction.

In one embodiment, the chamber is configured to be spaced apart from the center of the first and second upper endpoints by a second length in the second direction and spaced from the center of the inflow portion by a third length in the second direction A first edge formed from the center point to the first upper end point, and a second edge formed from the center point to the second upper end point.

In one embodiment, the first width is 50 mm, the first length is 10 mm, the second length is 8 mm, and the third length may be 5 mm.

In one embodiment, the chamber may be defined as the interior of the space defined by the first outer bevel, the second outer bevel, the first corner, and the second corner.

In one embodiment, the thickness of the chamber is continuously reduced from the first outer oblique side toward the first edge along the second direction, and the thickness of the chamber from the second outer oblique side toward the second edge The thickness of the chamber can also be continuously reduced.

In one embodiment, a flat first discharge surface may be formed from the first and second edges to the end of the first discharge portion.

According to the embodiments of the present invention, the opening forming the space filled with ink between the first and second frames constituting the slot die, and the chambers forming an oblique plane symmetrical with respect to each other, The space for storing the ink introduced into the chamber is optimized to minimize the waste of the ink and the ink discharged through the slot die can be uniformly maintained to improve the uniformity of the coating have.

In particular, the chamber defines a space including first and second outer oblique surfaces and first and second edges, the space having a shape in which the depth is continuously reduced in a downward direction in which ink is ejected, Thus, continuous and uniform ejection of the ink can be induced.

Furthermore, since the first and second outer oblique surfaces are designed to have an oblique oblique shape, the space of the chamber can be reduced more than the conventionally rectangular shape of the chamber as a whole, so that the ink remaining in the chamber after coating is minimized, Can be minimized.

In this case, since the inflow portion into which the ink flows is formed at the upper end of the chamber to which the first and second outer oblique surfaces are connected, the ink introduced into the inflow portion is naturally moved downward by the gravity, To be uniformly discharged through the discharge portion having the first width.

Also, it can be seen that the thickness of the coating is kept very uniform through the design of the slot die according to the present embodiment.

1 is a schematic view showing a slot die coating according to the prior art.
2 is an exploded perspective view showing a slot die according to an embodiment of the present invention.
Figures 3a and 3b are side and frontal schematic views for modeling fluid flow between parallel plates.
FIG. 4A is a front view showing a chamber of a lower frame of the slot die of FIG. 2, and FIG. 4B is a side view of a chamber of a lower frame of the slot die of FIG.
FIG. 5 is a graph comparing the uniformity of coating using the conventional slot die and the slot die of FIG. 2;

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the term "comprises" or "comprising ", etc. is intended to specify that there is a stated feature, figure, step, operation, component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view showing a slot die according to an embodiment of the present invention.

Referring to FIG. 2, the slot die 10 according to the present embodiment is used for slot die coating as shown in FIG. 1, and corresponds to a configuration in which the slot die 3 shown in FIG. 1 is replaced.

The slot die 10 includes a first frame 100, an intervening unit 200, and a second frame 300.

The first frame 100 includes a chamber 110, a first discharging unit 120, a fixing unit 130 and an inlet 150. The intervening unit 200 is provided with an opening 210 and a fixing hole 130, And the second frame 300 includes a second discharging portion 320. The second discharging portion 320 may be formed to have a substantially rectangular shape.

The first and second frames 100 and 300 are coupled to each other through the fixed unit 130 and the intervening unit 200 is interposed between the first and second frames 100 and 300 , The fixing unit 130 passes through the fixing hole 230.

Although the chamber 110 is formed on the inner surface of the first frame 100, the inner surface of the second frame 300 is only machined smoothly and a space such as a separate chamber is not formed.

The inflow part 150 is provided with a fluid such as ink provided through the pipe 2 through a supply part 151 which will be described later and the inflow part 150 is connected to the upper end of the chamber 110, And is formed to penetrate through the frame 100.

The chamber 110 is a space in which the fluid introduced into the inflow part 150 is stored in the direction of the first discharge part 120. The specific shape of the chamber 110 will be described later.

The first discharging unit 120 is a part for guiding the fluid that has passed through the chamber 110 together with the second discharging unit 320 to be discharged to the outside of the slot die 10, 100 and the lower end of the second frame 300.

In this case, a space is generated between the first and second discharging units 120 and 320 by a gap induced by the intervening unit 200, And is discharged to the outside of the die 10.

The intervening unit 200 has a predetermined thickness and a gap between the first frame 100 and the third frame 300 is determined according to the thickness of the intervening unit 200, 2 The gap between the discharge portions 120 and 320 is also determined.

More specifically, the intervening unit 200 includes first and second oblique faces 211 and 212 extending obliquely symmetrically with respect to each other from the same position as the inflow portion 150, and first and second oblique faces 211 and 212, And first and second vertical surfaces 213 and 214 extending parallel to each other from the respective ends.

That is, the opening 210 of the intervening unit 200 is opened by the first and second oblique faces 211 and 212 and the first and second vertical faces 213 and 214, The second oblique faces 211 and 212 extend the same as the first and second outer oblique faces 111 and 112 of the chamber 110 described later.

Meanwhile, the first and second vertical surfaces 213 and 214 form the first and second discharge portions 120 and 320, respectively.

Thus, the fluid introduced into the inflow part 150 is stored or moved in the space opened by the opening part 210.

In order to minimize the amount of the fluid stored in the chamber 110 and allow the fluid introduced into the inflow section 150 to be uniformly discharged through the first and second discharge sections 120 and 320, The shape of the chamber 110 and the first and second discharging portions 120 and 320 will be described.

In order to design the optimal shape of the chamber 110 and the first and second discharge portions 120 and 320, modeling of fluid flow between the parallel plates will be described first.

Figures 3a and 3b are side and frontal schematic views for modeling fluid flow between parallel plates.

는 식 (1)과 같이 정의된다. Referring to Figures 3a and 3b, the capillary force between the illustrated parallel plates

Is defined as Equation (1).

식 (1)

Equation (1)

이며, At this time,

Lt;

평행판 간극,

평행판 폭,

평행판 길이,

유속,

점도,

동적 접촉각,

압력이다.

Parallel plate gap,

Parallel plate width,

Parallel plate length,

Flow rate,

Viscosity,

Dynamic contact angle,

Pressure.

는 하기 식 (2)로 정의될 수 있다. On the other hand, when the fluid flows through the slot die 10 shown in FIG. 2,

Can be defined by the following equation (2).

식 (2)

Equation (2)

이며, At this time,

Lt;

는 두 평행판 사이에서의 유체 마찰력,

는 두 평행판 사이에서의 모세관 힘,

는 두 평행판 사이에서 압력차에 의한 힘,

는 두 평행판 사이 유체 중력에 의한 힘이다.

Is the friction force between two parallel plates,

Is the capillary force between two parallel plates,

The force due to the pressure difference between the two parallel plates,

Is the force due to fluid gravity between the two parallel plates.

는 식 (3)으로 정의된다. Since the force in Equation (2) is balanced,

Is defined by equation (3).

식 (3)

Equation (3)

과 유량의 관계는 식 (4)로 정의되고, On the other hand,

And the flow rate is defined by equation (4)

식 (4)

Equation (4)

은 하기 식 (5)로 정의된다. From Equations (3) and (4) above, the resistance of the fluid

Is defined by the following equation (5).

식 (5)

Equation (5)

As a result, the resistance of the fluid between the parallel plates is proportional to the viscosity of the fluid and the distance of the parallel plate, and is determined by the difference between the resistance value in inverse proportion to the cube of the gap and the resistance value due to capillary phenomenon and gravity.

Hereinafter, a method of optimizing the shape of the chamber 110 of the slot die 10 according to the present embodiment will be described based on the above derived equations.

FIG. 4A is a front view showing a chamber of a lower frame of the slot die of FIG. 2, and FIG. 4B is a side view of a chamber of a lower frame of the slot die of FIG.

Referring to FIGS. 4A and 4B, the chamber 110 has an isosceles triangle shape whose bottom surface is not horizontal, and when considering the shape of the chamber 110 and the first discharge portion 120, It can be seen that the isosceles triangle has a shape in which the isosceles triangle is located.

However, the first discharge part 120 forms a flat surface from the bottom surface of the chamber 110, but the chamber 110 has a space formed inside the first frame 100.

More specifically, the inlet portion 150 is formed at the uppermost end of the chamber 110. When the center of the inlet portion 150 is defined as P1, the chamber 110 is inclined obliquely And is formed as a second outer oblique surface 112 obliquely downward rightward from P1.

If the end of the first outer oblique surface 111 is defined as a first upper end point P3 and the end of the second outer oblique surface 112 is defined as a second upper end point P6, then P3 and P6 are symmetrical In the first direction (X).

That is, P3 and P6 are equally spaced apart from the end of the first discharge portion 120 by a first length L _{1 in} a second direction Y.

Meanwhile, in the chamber 110, when a center point P2 is defined on the lower side along the second direction Y from P1, the P2 has a second length L (L) in the second direction Y ₂ , so that P1 and P2 are spaced apart from each other by the third length L _{3 in} the second direction Y. [

That is, when the chamber 110 is defined as a space connecting the defined P1, P3, P2 and P6, the corner from P3 to P2 is defined as the first corner 113, the corner from P6 to P2 2, the chamber 110 is defined as the inner space of the first and second outer oblique faces 111 and 112 and the first and second corners 113 and 114 .

A first lower end point extending along the second direction Y with respect to the P3 and contacting an end of the first discharge surface 121 is P5 and a second lower end point extending along the second direction Y with respect to the P6 P7 is defined as a second lower end point that meets the end of the first discharge surface 121 and P4 is defined as a discharge center point which is the center of P5 and P7. The first discharge surface 121 is defined as P3, P2 , P6, P7, P4 and P5.

In this case, the first discharging surface 121 is formed as a flat surface, and the second discharging surface of the second discharging portion 320 and the second discharging surface of the second discharging portion 320 are equal to the thickness d ₁ of the intervening unit 200, And the fluid is discharged through the spacing space.

As shown in FIG. 4B, the chamber 110 is formed with a first slope 118, which is deeply continuous from the center point P2 to P1, as shown in FIG. 4B. And a second inclined portion 119 having a depth continuously extending from the first upper end point P3 or the second upper end point P6 to P1 is formed.

In this case, when the first frame 100 has a thickness of the first depth b, the first inclination 118 and the second inclination 119 are inclined from the P1 to the first depth b ) smaller than the second thickness (d ₂₎ meet each other at the embedded position a.

Thus, the depth of the chamber 110 decreases downward along the second direction Y, and each of the first and second outer oblique faces 111 and 112 extends from P1 to P3 and P6 The thickness decreases as the thickness increases.

Similarly, the thickness of the chamber 110 from the first and second outer oblique faces 111 and 112 toward the first and second edges 113 and 114 along the second direction Y And decreases continuously.

이라 정의하고, P1->P3->P5(이는 P1->P6->P7과 동일함)까지의 저항을

라 정의할 때, 상기 챔버(110)의 최적 설계를 위해서는 하기 식 (6)을 만족하는 조건을 찾는 것이 필요하다. Meanwhile, when the first width (a) is 50 mm and the first depth (b) is 15 mm, the first to third lengths (L ₁ , L ₂ , L ₃ ) and the first and second Referring again to equation (5) above for the derivation of the optimum design values of the thicknesses d ₁ and d ₂ , the resistance from P1 to P2 to P4 in the shape of the chamber 110

And the resistance to P1->P3-> P5 (which is the same as P1->P6-> P7)

It is necessary to find a condition satisfying the following equation (6) for the optimal design of the chamber 110. [

식 (6)

Equation (6)

과

에 대하여 상기 식 (6)을 만족시키는 조건을 찾게 되면, 상기 유입구(150)를 통해 유입된 유체는 상기 챔버(110)의 내부 전체에서 균일하게 유동하게 되며, 이에 따라 상기 슬롯다이(10)를 통해 토출되는 유체가 가장 균일하게 유지될 수 있다. This is because the fluid introduced through the inlet 150 flows between two lines P1 -> P2 -> P4 and P1 -> P3 -> P5,

and

The fluid that has flowed through the inlet 150 flows uniformly through the entire interior of the chamber 110, and thus the slot die 10 It is possible to maintain the fluid to be discharged most uniformly.

및

는 각각 식 (8) 및 식 (9)로 유도된다. On the other hand, for the actual design of the chamber 110, assuming that the resistance of the fluid between the parallel plates is proportional to the distance of the parallel plate and has a resistance value inversely proportional to the square of the gap,

And

(8) and (9), respectively.

식 (7)

Equation (7)

식 (8)

Equation (8)

식 (9)

Equation (9)

As described above, the first to third lengths L ₁ , L ₂ , and L ₃ for determining the detailed shape of the slot die 10 and the lengths L ₁ , The first and second thicknesses d ₁ , d ₂ can be determined.

FIG. 5 is a graph comparing the uniformity of coating using the conventional slot die and the slot die of FIG. 2;

With reference to the above equations (6) to (9), when the shape of the slot die 10 is optimally designed for N = 1, a design value (primary design) as shown in Table 1 below is derived, In this case, when coating is performed through the slot die 10, the coating thickness for each position is as shown in FIG.

[Table 1] Primary design value of slot die (unit, mm)

In this case, as shown in FIG. 5, the deviation of the coating thickness by position was relatively severe (average 16%), and in order to correct this, optimal design was performed for various N values including N = 0.72 , And the design value (secondary design) as shown in Table 2 below was derived.

[Table 2] Secondary design value of slot die (unit, mm)

Meanwhile, as shown in FIG. 5, in the case of the secondary design value, the deviation of the coating thickness according to the position is very small, about 3%, and it is confirmed that the uniformity of the discharged fluid is also very high.

As described above, based on the design of the fluid flow between the parallel plates, it is possible to design the chamber 110 capable of maintaining the amount of discharged fluid uniformly with respect to a predetermined width while maintaining a minimum volume And the optimum design values of the chamber 110 derived from the results are shown in Table 2. [Table 2]

According to the embodiments of the present invention as described above, the chamfering surfaces are symmetrical to each other, and the opening forming the space filled with the ink between the first and second frames constituting the slot die, It is possible to optimize the space for storing the ink introduced into the chamber to minimize the waste of the ink and uniformly maintain the ink discharged through the slot die, Can be improved.

In particular, the chamber defines a space including first and second outer oblique surfaces and first and second edges, the space having a shape in which the depth is continuously reduced in a downward direction in which ink is ejected, Thus, continuous and uniform ejection of the ink can be induced.

Furthermore, since the first and second outer oblique surfaces are designed to have an oblique oblique shape, the space of the chamber can be reduced more than the conventionally rectangular shape of the chamber as a whole, so that the ink remaining in the chamber after coating is minimized, Can be minimized.

In this case, since the inflow portion into which the ink flows is formed at the upper end of the chamber to which the first and second outer oblique surfaces are connected, the ink introduced into the inflow portion is naturally moved downward by the gravity, To be uniformly discharged through the discharge portion having the first width.

Also, it can be seen that the thickness of the coating is kept very uniform through the design of the slot die according to the present embodiment.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

The slot die with improved chamber geometry according to the present invention has industrial applicability that can be used for slot die coating.

10: slot die 100: first frame
110: chamber 120: first discharge part
130: Fixing unit 150:
200: interposing unit 210: opening
230: Fixing hole 300: Second frame
320: second discharge portion

Claims (10)

Is used for slot die coating for discharging and coating the ink provided from the ink supply unit,
A first frame including an inlet to which the ink is supplied, a chamber that stores the ink supplied to the inlet, and a first discharge portion that is positioned below the chamber and through which the ink is discharged;
A second frame coupled to the first frame and including a second ejection portion facing the first ejection portion; And
And an intervening unit interposed between the first and second frames to form a space between the first chamber and the first and second ejecting portions,
The intervening unit includes an opening, the opening including a pair of oblique faces extending symmetrically from each other from the inlet, and a pair of vertical faces extending in parallel to each other from each of both ends of the oblique faces. Slot die. The apparatus according to claim 1,
Wherein the gap is formed to have a first thickness and a gap of a first thickness is formed between the first and second discharges. The apparatus of claim 1,
A first outer oblique surface formed from the center of the inflow portion to a first upper end point; And
And a second outer oblique surface formed from a center of the inflow portion to a second upper end point that is symmetrical with the first upper end point. The method of claim 3,
Wherein each of the first and second outer oblique faces extends from a center of the inlet to the first and second upper end points and is reduced in thickness. The method of claim 3,
The first and second upper endpoints being spaced apart by a first width in a first direction,
Wherein each of the first and second upper end points is spaced apart from the end of the first discharge portion by a first length in a second direction perpendicular to the first direction. 6. The apparatus of claim 5,
With respect to a center point spaced from the center of the first and second upper end points by a second length in the second direction and spaced from the center of the inflow portion by a third length in the second direction,
A first edge formed from the center point to the first upper end point, and a second edge formed from the center point to the second upper end point. The method according to claim 6,
Wherein the first width is 50 mm, the first length is 10 mm, the second length is 8 mm, and the third length is 5 mm. 7. The apparatus of claim 6,
The second outer bevel, the first outer bevel, the second outer bevel, the first edge, and the second edge. 9. The method of claim 8,
The thickness of the chamber is continuously reduced from the first outer oblique surface toward the first edge along the second direction,
The thickness of the chamber continuously decreasing from the second outer oblique surface toward the second edge along the second direction. 9. The method of claim 8,
And a flat first discharge surface is formed from the first and second edges to the end of the first discharge portion.

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