JP2004033867A - Curtain coater nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable efficient, good application by preventing defective stain by a conveyer, preventing the thickening and bilding-up of a coating material on an application boundary, and reducing the consumption of the coating material with regard to a curtain coater nozzle. <P>SOLUTION: In the curtain coater nozzle, the width of an ejection opening 41 for the coating material is set up to agree with the inside of amember 3 to be coated, and the member 3 is coated with a coating film (a liquid curtain 11) ejected from the opening 41. The discharge at both ends of the opening 41 is adjusted, and an ejection adjustment mechanism, in which both ends of the opening 41 are formed triangularly by a taper part 42, for ejecting both ends of the coating film to be thinner than the middle part is installed. By the application by the adjustment mechanism, to the member 3, the film thickness of the coating material at both ends is made to have the same height as that of the middle part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the application of a solder resist to a printed wiring board (for coating a coating film), the coating of a photosensitive film such as an etching register of a printed wiring board, and a plate-shaped body such as a resin plate or ceramic. The present invention relates to a curtain coater nozzle that can be used for forming a coating film on a substrate, for forming a coating film of colored tin, for coating a metal member (for example, a metal plate) or a resin member (for example, a resin plate), and for chemical milling. .
[0002]
2. Description of the Related Art A conventional example will be described below.
[0003]
(1): Description of Conventional Example 1
FIG. 9 is an explanatory diagram of the first conventional example. This example is an example of a general curtain coater. FIG. 9 is a sectional view of an application of a general curtain coater, an inlet-side punch diagram, and an outlet-side punch diagram.
[0004]
The curtain coater is provided with a nozzle 1, a receiving table 2, a transport mechanism (not shown), and the like, so that a coating material 4 such as ink can be discharged from a discharge port of the nozzle 1 in a direction indicated by an arrow. In this case, if there is no member 3 to be coated, the discharged coating material 4 is received by the receiving table 2. The member to be coated 3 is transported by a transport mechanism in the direction indicated by the arrow.
[0005]
Now, in a state where the coating material 4 such as ink is discharged from the discharge port of the nozzle 1 in the direction of the arrow shown in the drawing, when the member to be coated 3 is transported by the transport mechanism in the direction of the arrow in the drawing, the member 3 is placed on the member 3 to be coated. The coating material 4 adheres. Thus, the coating material 4 is applied to the member 3 to be coated.
[0006]
(2): Description of Conventional Example 2
FIG. 10 is an explanatory diagram of Conventional Example 2. Conventional example 2 is an example of a method and an apparatus for reducing turbulence during curtain coating (see JP-A-8-323263).
[0007]
In FIG. 10, a substrate 13 that moves in the direction of arrow 12 is coated with a liquid curtain 11 that freely descends. The width of the liquid curtain 11 is smaller than the base material 13. The liquid curtain 11 is held between the curtain holders 14. Immediately before the curtain contacts the substrate 13, the end 15 of the curtain is separated at the penetration band 16.
[0008]
A central part 17 of the freely descending curtain and an end 15 of the freely descending curtain are formed. A curtain 18 forms a coating 18 on the substrate 13 and uncoated areas 19 remain on both sides of the substrate 13. The freely descending curtain end 15 passes through the opening 20 and the outlet 21 and is evacuated at the bottom of the curtain holder 14.
[0009]
In the method of cutting a curtain (a curtain of a coating material such as ink or paint) with an air knife as in Conventional Example 2, the equipment is large-scale, and there are many items to control such as the air flow rate, pressure, and angle of the air knife.
[0010]
(3): Description of Conventional Example 3
FIG. 11 is an explanatory diagram of Conventional Example 3. Conventional example 3 is an example of a curtain coater (see JP-A-9-290196).
[0011]
This curtain coater forms unpainted portions on two opposing sides of a plate-like body, and restricts the flow-down range of at least one side of the paint 25 flowing down in a curtain shape to thereby reduce the side of the plate-like body 26. To form an unpainted portion along the transport direction. For this purpose, a limiting plate 28 having a width and a length capable of forming an unpainted portion having a predetermined width, and a side located at a boundary between the painted portion and the unpainted portion is formed on a knife edge 27. In addition to covering the unpainted portion, the distance between the knife edge 27 and the surface of the plate-like body 26 and the inclination angle of the limiting plate 28 can be adjusted.
[0012]
In the method of cutting the curtain with the limiting plate 28 as in Conventional Example 3, the coating material 29 at the coating boundary becomes thick and swells.
[0013]
(4): Description of Conventional Example 4
FIG. 12 is an explanatory diagram of Conventional Example 4. Conventional example 4 is an example of a curtain coater head (see Japanese Patent Application Laid-Open No. 9-38559).
[0014]
The curtain coater head of Conventional Example 4 is intended to improve the quality and reduce the cost by keeping the curtain width constant irrespective of the viscosity of the coating liquid in the curtain coating method, and to increase the gap W at the bottom of the liquid storage tank 31. A wide portion 33 composed of a circular through-hole 1.5 to 100 times the gap W is provided at both ends of the slit 32 to form a curtain coater head. The width of the curtain 34 flowing down from the slit 32 can be constantly formed from immediately below the slit 32 in accordance with the length L of the slit 32. Reference numeral 29 denotes a coating material at a coating boundary.
[0015]
(5): Description of Conventional Example 5
FIG. 13 is an explanatory diagram of Conventional Example 5. Conventional example 5 is an example of a curtain coater head (see JP-A-6-79214).
[0016]
Conventional example 5 provides a curtain coater head capable of continuously applying a coating liquid to a coating object even with a coating liquid containing particles having a relatively large specific gravity such as a metal powder. A liquid level setting means is provided on the side wall 36 of the storage tank 35 having an open top, and the coating liquid in the storage tank 35 is caused to flow 38 in a curtain shape below the bottom opening 37 of the storage tank 35. Are provided.
[0017]
The above-mentioned prior art has the following problems.
[0018]
(1): In a conventional coating method using a curtain coater, the coating efficiency of a coating material is high, and a thick coating film can be applied. Therefore, recently, a coating method has been widely used instead of a spray coater. However, since most curtain coaters and spray coaters are applied on the entire surface, the conveyance conveyor generates stains.
[0019]
For this reason, there is a problem that it takes time to clean the conveyor as a countermeasure. As a countermeasure for preventing this contamination, a V-conveyor is used, but it is not sufficient, and a method that does not apply to both ends is required.
[0020]
(2): The curtain coater has a method of applying a required width, but the method of cutting a curtain (a curtain of an application material such as ink or paint) with an air knife requires a large facility. Further, it is difficult to stably maintain the ejection amount and angle of the air knife.
[0021]
Further, in the method of cutting and collecting the curtain with the limiting plate, the wetted portion of the limiting plate changes, and the coating boundary position is not stable. In addition, there are problems such as the boundary portion becoming thick, swelling, and a difference in drying time in a subsequent process, which is not practical. Further, even with the method of fixing the nozzle width narrower than the member to be coated, there is a problem that the coating material at the coating boundary becomes thick, swells, and a difference occurs in the drying time in the subsequent process.
[0022]
In addition, foam may be involved and applied. In addition, there is a problem in that a curtain of the coating material (ink, paint, or the like) that accumulates inside the nozzle is cut off by solid matter.
[0023]
(3): The main method is to apply the entire surface. In this method, a member to be applied is applied by passing through a curtain of a wide application material (ink or paint). This method has the following problems.
[0024]
{Circle around (1)} Since the coating material is applied to the end surface of the member to be coated, the coating material gradually adheres to the transport conveyor, and becomes dirty as the transport conveyor continues coating production.
[0025]
{Circle around (2)}: When the conveyor contaminated with the coating material is transported, the coating material re-adheres to the opposite surface of the member to be coated and becomes dirty. This dirt gives poor appearance for general coating. Applying a photosensitive SR agent to a printed wiring board causes shape defects.
[0026]
{Circle around (3)} In curtain coater application, bubbles are involved and application in which bubbles are mixed occurs.
[0027]
{Circle around (4)}: Solid matter of the coating material (ink, paint, etc.) is solidified in the nozzle, and the curtain is broken.
[0028]
(4): Spray coaters have come up with a method of applying a required width, but have the following problems.
[0029]
{Circle around (1)} The method of cutting a curtain (a curtain of a coating material such as ink or paint) with an air knife requires a large-scale facility, and it is difficult to maintain a stable air knife.
[0030]
{Circle around (2)} In the method of cutting the curtain with the limit plate, the coating material at the coating boundary becomes thick, swells, and a difference occurs in the drying time in the post-process.
[0031]
{Circle around (3)} Even with the method of fixing the nozzle width narrow, the coating material at the coating boundary becomes thick, swells, and a difference occurs in the drying time in the post-process.
[0032]
The present invention solves such conventional problems, prevents contamination failure of the conveyor, prevents the coating material at the coating boundary from becoming thick and bulging, reduces the consumption of the coating material, and mixes with the coating material. It is an object of the present invention to separate bubbles formed and prevent entrapment, thereby enabling good coating.
[0033]
The present invention has the following configuration to achieve the above object.
[0034]
(1): The width of the outlet of the coating material is set to a width corresponding to the inside of the member to be coated (for example, the plate to be coated), and the coating material (liquid curtain) blown from the outlet is applied to the member to be coated. In the curtain coater nozzle for performing the coating, the discharge amount at both ends of the discharge port is adjusted, and a discharge control mechanism that discharges both ends of the coating curtain thinner from the center portion is provided. It is characterized in that coating can be performed such that the film thickness of the coating material at both ends becomes the same height as the central portion.
[0035]
(2): In the curtain coater nozzle of (1), the ejection adjusting mechanism makes the both ends of the ejection port triangular so that the discharge amount of the coating material passing through the ejection port is closer to the both ends than the center. The mechanism is characterized in that a mechanism is provided for ejecting both ends of the coating curtain thinly by limiting so as to reduce the number of colors.
[0036]
(3): In the curtain coater nozzle of (1), the ejection adjusting mechanism divides the nozzle port member into two blocks, and adjusts the width of the ejection port as a divided slide mechanism in which the two blocks are slidably combined. It is characterized in that it is configured to be changeable and has a mechanism for applying with an arbitrary width.
[0037]
(4): In the curtain coater nozzle of the above (1), the blow-out adjusting mechanism is provided with flow rate limiting members for limiting the flow rate of the coating material at both ends of the blow-out port so that both ends of the coating curtain are blown thinly. And the flow rate limiting member is configured to be movable in the width direction of the coating curtain, so that the coating width can be set arbitrarily.
[0038]
(5) In the curtain coater nozzle of the above (1), a separation tank for separating foam from the transferred coating material and a coating material sent from the separation tank are stored in the nozzle member of the curtain coater. A nozzle tank that discharges from the ejection port, and a collection tank that collects the coating material that overflows from the nozzle tank, and a bubble separation mechanism that separates bubbles mixed in the coating material sent from the separation tank into the nozzle tank. Is provided to separate bubbles, and only the coating material containing no bubbles is discharged from the ejection port, and the nozzle tank is provided so as to be slidable with respect to the separation tank and the separation tank. Thus, the discharge pressure of the coating material discharged from the ejection port can be finely adjusted.
[0039]
(Action)
The operation of the present invention based on the above configuration will be described.
[0040]
(A): In the above (1), the ejection amount at both ends of the ejection port is adjusted, and the ejection adjusting mechanism for ejecting both ends of the coating curtain (liquid curtain) thinner than the center portion is provided. By the application by the ejection adjusting mechanism, the application material can be applied to the member to be applied such that the thickness of the application material at both ends becomes the same height as the central portion.
[0041]
With this configuration, the coating can be performed with a stable width inside the member to be coated. Therefore, both ends of the member to be coated are not stained, and the conveyor is not stained. Further, the consumption of the coating material can be reduced by the reduction of the coating area.
[0042]
In addition, since the coating material at the coating boundary can be prevented from being thickened and rising, the drying unevenness can be prevented, and the coating material such as the photosensitive positive SR ink can be stably applied and dried. Further, the coating thickness of the coating curtain can be averagely applied, the application boundary can be closest to the required range, and the consumption of the coating material can be reduced.
[0043]
(B): In the above (2), the ejection adjusting mechanism makes the both ends of the ejection port triangular so that the discharge amount of the coating material passing through the ejection port is smaller at the both ends than at the center. By restricting, a mechanism is provided for ejecting both ends of the coating curtain thinly. Therefore, it is possible to apply the coating material to the member to be applied such that the thickness of the coating material at both ends is the same as the height of the central portion.
[0044]
Therefore, it is possible to apply a stable width to the inside of the member to be applied. Therefore, both ends of the member to be coated are not stained, and the conveyor is not stained. Further, the consumption of the coating material can be reduced by the reduction of the coating area.
[0045]
(C): The ejection adjusting mechanism divides the nozzle port member into two blocks, and is configured to be able to change the width of the ejection port as a divided slide mechanism in which the two blocks are slidably combined. It has a mechanism for applying.
[0046]
Therefore, even if the width of the member to be coated is different, the coating can be performed with a stable width inside the member to be coated. Therefore, both ends of the member to be coated are not stained, and the conveyor is not stained. Further, the consumption of the coating material can be reduced by the reduction of the coating area.
[0047]
(D): In the above (4), the ejection adjusting mechanism is provided with a flow rate limiting member for limiting the flow rate of the coating material at both ends of the ejection port so as to blow out both ends of the coating curtain thinly. The limiting member is configured to be movable in the width direction of the coating curtain, so that the coating width can be set arbitrarily.
[0048]
Therefore, it is possible to apply a stable width to the inside of the member to be applied. Further, even if the width of the member to be coated is different, the coating can be performed with a stable width inside the member to be coated. For this reason, both ends of the member to be coated are not stained, and the conveyor is not stained. In addition, the consumption of the application material can be reduced by the reduction in the application area.
[0049]
(E): In the above (5), in the nozzle tank, a bubble separation mechanism for separating bubbles mixed in the coating material sent from the separation tank is provided to separate the bubbles, and only the coating material containing no bubbles is ejected. And the nozzle tank is provided so as to be slidable in the vertical direction with respect to the separation tank and the separation tank. By adjusting the slide of the nozzle tank, the discharge pressure of the coating material discharged from the ejection port can be finely adjusted. ing.
[0050]
By doing so, it is possible to separate bubbles mixed in the coating material in the nozzle tank. Therefore, pinholes, bubble marks, and the like due to bubbles on the application surface can be reduced. In addition, the separation of bubbles mixed in the coating material in the nozzle tank and the fine adjustment of the coating pressure can be performed, so that the fine adjustment of the coating thickness can be stably performed. In this way, bubbles are separated from the application material to prevent entrapment, fine adjustment of the discharge pressure can be easily performed, and efficient and favorable application can be performed.
[0051]
Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, the term “coating material” or “coating agent” includes ink, paint, resin, and other coating materials. Further, a member (for example, a plate-shaped body) to which the coating material is applied is referred to as a “member to be applied”. In addition, the coating curtain spouting from the spout is also referred to as "liquid curtain".
[0052]
§1: Outline of curtain coater nozzle
(1): When the width of the ejection port provided in the nozzle member of the curtain coater is set to a width corresponding to the inside of the member to be applied, the discharge amount at both ends of the ejection port is limited to form a coating film (liquid curtain). Spout thinly on both ends.
[0053]
In this case, since the liquid that falls in a curtain shape has the property that the portion with a small discharge amount becomes thinner, if the discharge amount at both ends of the nozzle is smaller than the inside, the liquid is discharged from both ends of the ejection port thinly. be able to.
[0054]
(2): In the case where the thickness of the coating material at both ends is applied to the member to be applied at the same height as the inside, if the coating material at both ends of the ejection port is discharged thinly, the coating material at both ends is reduced. As the coating curtain (liquid curtain) falls, it becomes rounder and can be applied at a height such that it has the same film thickness as the central part. In this way, it is possible to perform coating with a fixed width and without thickening at both ends (thickness in the conventional example).
[0055]
(3): The discharge amount of the coating material can be adjusted by adjusting the opening areas at both ends of the ejection port to be small. In this case, since the portion of the liquid falling in a curtain shape having a small discharge amount has a property of being thin, the ends of the coating curtain (liquid curtain) can be made thin by making both ends of the ejection port triangular.
[0056]
(4): The nozzle member is divided into two blocks, and the two blocks are slidably combined into a divided slide mechanism so that the width of the ejection port can be changed so that the nozzle can be applied to an arbitrary width. . In this manner, the coating can be performed with the coating width arbitrarily changed and set without increasing the thickness of the boundary.
[0057]
(5): When the width of the ejection port of the nozzle port member is set to a width corresponding to the inside of the member to be applied, a flow rate limiting member is provided inside both ends of the ejection port, and both ends of the coating curtain (liquid curtain) are provided. Spout thinly. in this case,
{Circle around (1)} The curtain-dropping liquid has a property that “a portion with a small discharge amount becomes thin”.
[0058]
{Circle around (2)} The liquid discharge amount (flow rate) has a property proportional to the area through which the liquid passes.
[0059]
Therefore, from these, to limit the coating width of the curtain coater without thickening the coating boundary,
{Circle around (1)} A flow restricting member for discharging a small amount of coating material at both ends is provided at both ends.
[0060]
{Circle around (2)}: The coating material of the coating material at both ends is rounded as it falls, and the coating is applied at such a height as to have the same film thickness as the central part.
[0061]
By adopting a structure that satisfies these two conditions, it is possible to apply the coating to a fixed width without increasing the thickness of the boundary.
[0062]
(6): The flow rate limiting members provided at both ends of the nozzle port member are slidable, and the coating width is set arbitrarily. in this case,
{Circle around (1)}: The flow rate limiting members provided at both ends of the ejection port of the nozzle port member move in parallel (move in the width direction of the liquid curtain).
[0063]
{Circle around (2)}: The entire width of the coating curtain ejected from the ejection port of the nozzle port member is made variable.
[0064]
By adopting a structure that satisfies the above two conditions, it is possible to perform coating with the coating width arbitrarily changed and set without increasing the thickness of the boundary.
[0065]
(7): When foam separation and uniform discharge pressure are performed by the nozzle member of the curtain coater, bubbles in a liquid having a high viscosity are difficult to separate in a normal stationary state.
{Circle around (1)}: There is a property that "bubbles are easily separated when lifted to the surface".
[0066]
{Circle around (2)}: There is a property that "bubbles lifted on the surface easily sink at low flow rates".
[0067]
{Circle around (3)}: There is a property that "bubbles do not easily pass through a fine mesh with a liquid having a high viscosity".
[0068]
From these facts, in the nozzle port member of the curtain coater,
{Circle around (1)}: The flow of the coating material is changed to an upward flow in a separation tank provided before the nozzle tank.
[0069]
{Circle around (2)} A mesh member is provided at the partition between the separation tank and the nozzle tank to separate bubbles from the coating material.
[0070]
{Circle around (3)} In the nozzle tank, “enlarge the surface and prevent sedimentation and sedimentation of separated bubbles”.
[0071]
{Circle around (4)} A recovery tank is provided, and the circulation of “makes the supply flow of the coating material larger than the discharge amount and generates a surface flow to collect bubbles” is performed.
[0072]
{Circle around (5)} A mesh member is provided in the nozzle tank to prevent bubbles from passing therethrough.
[0073]
By providing these five conditions, bubbles for curtain coater application can be separated and entrainment can be reduced.
[0074]
Further, the separation tank and the recovery tank are divided from the nozzle tank, and the separation tank and the recovery tank can be vertically slid in the vertical direction, so that the discharge pressure can be finely adjusted.
[0075]
§ 2: Explanation of each part of curtain coater
(1): Explanation of nozzle port of curtain coater
FIG. 1 is an explanatory view of a nozzle port of a curtain coater. FIG. 1A is a nozzle port member of a curtain coater, and FIG. In FIG. 1A, FIG. 1A-1 is a cross-sectional view taken along line XY of FIG. 1A-2. In FIG. 1, reference numeral 40 denotes a nozzle port member, 41 denotes a jet port, 42 denotes a tapered portion, 3 denotes a member to be applied, 4 denotes a coating material, and 11 denotes a liquid curtain.
[0076]
As shown in FIG. 1A, both ends of a coating material ejection port 41 of a curtain coater nozzle port member 40 installed in a direction crossing a coating direction of a member 3 (for example, a plate to be coated) are applied. The two ends of the liquid curtain (painting) 11 are thinly blown out by forming a triangular shape by two opposing taper portions 42 formed on both ends formed at the respective ends. In this case, as shown in (A-1), both ends of the ejection port 41 are made acute angles as shown in the figure (the angle a in FIG. 1 is an acute angle), and the coating thickness ejected from both ends (curtain pressure of the liquid curtain 11). Thinner than the center.
[0077]
That is, by forming the tapered portions 42 on both sides of both ends of the ejection port 41 formed inside the nozzle port member 40 of the curtain coater, the ejection port 41 is formed in a triangular shape with both ends being acute, and the width W of the ejection port 41 is reduced. , W1 at the center, and smaller as W2 and W3 toward both ends (W1>W2> W3).
[0078]
In this case, since the coating material has a property of being rounded by surface tension, if both ends of the ejection port 41 are thinly blown out, the coating material becomes rounded according to the falling distance. Then, by passing the coated plate 45 to a position where the middle of the liquid curtain 11 is balanced and the curtain thickness of the liquid curtain 11 becomes uniform, the boundary portion (both ends of the coating material 4) as shown in FIG. Can be applied in an arbitrary width without swelling.
[0079]
(2): Example of curtain coater nozzle with variable outlet width
2A and 2B show an example in which the width of the ejection port is made variable. FIG. 2A is a nozzle opening at the time of wide application, FIG. 2B is a nozzle opening at the time of narrow application, FIG. Is a sectional view of the nozzle at the time of narrow width application, FIG. E is a sectional view of the application at the time of wide width application, and FIG.
[0080]
As shown in FIG. 2, the nozzle port member 40 of the curtain coater is a divided slide mechanism, and the width of the ejection port 41 can be changed, so that the coating material can be applied to an arbitrary width. In this case, the nozzle port member 40 is divided into two blocks, a first block 44 and a second block 45, and the two blocks are slid so that the width of the outlet 41 can be changed. In addition, it becomes possible to change the ejection width (ejection width) of the coating material.
[0081]
Further, when the first block 44 and the second block 45 are slidably combined with facing each other, the tapered portion 42 is formed only on one of the blocks on both sides, that is, FIG. On the left side, the tapered portion 42 is formed on the first block 44 side, and the tapered portion is not provided on the second block 45 side. On the right side, the tapered portion 42 is formed on the second block 45 again. No taper portion is provided on one block 44 side.
[0082]
The two blocks 44 and 45 are slidably combined. Then, the two blocks 44 and 45 are slid and positioned, and the two blocks are fixed by the holder 46 so that they cannot be moved from outside. When the two blocks are to be moved, the holder 46 is removed, slid and positioned, and then the two blocks are fixed again by the holder 46 so as not to move (for example, fixed by screwing).
[0083]
If the two blocks 44 and 45 configured as described above are fixed at positions where both ends are aligned, the width WB of the ejection port 41 becomes the maximum width (the nozzle port at the time of wide application) as shown in FIG. Can be set. Further, if the two blocks are shifted in the direction of the arrow in FIG. 2B and combined, the width WN of the ejection port 41 can be set narrow (nozzle port at the time of narrow width application) (WB> WN).
[0084]
Accordingly, if the width of the ejection port is set to WB and the coating material is discharged, the width of the liquid curtain 11 is increased as shown in FIG. C, and the coating material 4 can be applied with a wide width WB as shown in FIG. . On the other hand, if the ejection material is discharged with the width of the ejection port set to WN, the width of the liquid curtain 11 becomes narrow as shown in FIG. D, and the application material 4 can be applied with a narrow width WN as shown in FIG. .
[0085]
(3): Example in which both ends of the coating curtain are blown out thinly
FIG. 3 is an example in which both ends of the coating curtain are ejected thinly. FIG. 3A is a cross-sectional view of the nozzle port member, FIG. 3B is a cross-sectional view of the coating, and FIG.
[0086]
In the means for applying the width of the ejection port 41 in the nozzle port member 40 of the curtain coater so as to match the inside of the coated plate 3, a flow rate limiting member (for example, a plate-like member) 48 is provided inside both ends of the ejection port 41. Is provided.
[0087]
In this case, in order to eject both ends of the liquid curtain 11 (coating) thinly, the flow rate limiting member 48 reduces the thickness of the liquid curtain 11 by (1): decreasing the ejection amount of the coating material (for example, ink) 4. And (2): the property that the end portion is rounded by the surface tension as the coating material 4 falls, and can be realized by passing the coating material 3 through the plate 3 at a height where the thickness of the coating material can be balanced.
[0088]
(4): Example in which coating width can be set arbitrarily
4 shows an example in which the coating width can be set arbitrarily. FIG. 4A is a cross-sectional view of a variable-sliding nozzle, FIG. 4B is a nozzle opening with a widened flow restricting member, and FIG. FIG.
[0089]
This example is an example in which the flow width restricting members 48 provided inside both ends of the nozzle port member 40 can be slidably variable (movable), so that the application width of the application material can be set arbitrarily. . As shown in FIG. 4A, the nozzle port member 40 is provided with a flow rate restricting member (for example, a plate member) 48 so as to be slidable (movable) in the ejection width direction of the ejection port 41.
[0090]
The movement of the flow rate restricting member 48 allows the coating width to be set arbitrarily. For example, if the flow rate restricting member 48 is set to a wide width (application width = WB), the width of the ejection port 41 becomes wide as shown in FIG. On the other hand, if the flow rate restricting member 48 is set to a narrow width (application width = WN) as shown in FIG. 4C, the width of the ejection port 41 becomes narrow, and application in a narrow width becomes possible.
[0091]
(5): Explanation of nozzle port member of curtain coater
FIG. 5 is an explanatory diagram of the nozzle port member, and is a diagram illustrating an example in which foam separation and uniform discharge pressure are performed by the nozzle port member of the curtain coater. 6A and 6B are explanatory diagrams of fine adjustment of the discharge pressure in the case where the bubble separation and the uniform discharge pressure are performed by the nozzle port member. FIG. 6A is an example in which the discharge pressure is reduced, and FIG. 6B is an example in which the discharge pressure is increased. is there.
[0092]
FIGS. 5 and 6 show examples of the case where the foam is separated and the discharge pressure is made uniform by the nozzle port member 40 of the curtain coater. In this example, the nozzle tank 51 provided in the nozzle port member 40 of the curtain coater is configured to be slidable in the vertical direction, thereby enabling fine adjustment of the discharge pressure. The details will be described below.
[0093]
As shown in FIG. 5, a separation tank 55 for separating bubbles and ink of the coating material 4 transferred from the coating material (for example, ink) transfer pump to the nozzle port member 40 of the curtain coater, and a curtain coating process. Nozzle tank 51, an inclined plate 54 provided above the nozzle tank 51, a mesh member 53 provided below the nozzle tank 51, a collection tank 52 for collecting ink overflowed in the nozzle tank 51, and the like. Is provided.
[0094]
The separation tank 55 is for separating bubbles and ink from the coating material 4 (bubbles are mixed) transferred from the transfer pump, and the inclined plate 54 is sent through the separation tank 55. This is for smoothing the flow of the applied coating material 4. The mesh member 53 is a mesh-like member (a member having a filter function that does not pass bubbles) for preventing bubbles mixed in the coating material 4 from passing in the direction of the discharge port 54.
[0095]
The collection tank 52 is for collecting the coating material 4 overflowing from the nozzle tank 51. The coating material 4 that has entered the collection tank 52 is sent from a lower side of the collection tank 52 to a collection tank (not shown) and collected.
[0096]
The operation of the curtain coater nozzle is as follows. The coating material 4 sent from the transfer pump is transferred (pressurized) in the direction indicated by the arrow (upward) by the pump pressure from the lower side to the upper side of the separation tank 55. At this time, bubbles are mixed in the coating material 4. The coating material 4 containing the foam is sent from the separation tank 55 to the nozzle tank 51, where the flow is smoothed by the inclined plate 54, and when the coating material 4 containing the foam overflows in the nozzle tank 51, the The coating material 4 is collected in the collection tank 52, and then collected in the collection tank.
[0097]
On the other hand, a part of the coating material 4 in which bubbles are mixed is removed by the mesh member 53, and only ink not containing bubbles is sent to the lower part of the nozzle tank 51 in the direction of the arrow shown in FIG. Then, curtain application (application by a liquid curtain) is performed.
[0098]
In the curtain coater nozzle having the above-described configuration, the position of the nozzle tank 51 can be slidably adjusted in the vertical direction, so that the discharge pressure of the coating material 4 can be finely adjusted. For example, as shown in FIG. 6A, when the position of the nozzle tank 51 is moved to the uppermost position in the vertical direction, the coating material is moved from the position of the ejection port 41 (the position of the bottom inside the nozzle tank 51). The height H1 to the uppermost position of No. 4 (the uppermost position of the ink overflowing from the nozzle tank 51 to the collection tank 52) is the smallest.
[0099]
In this case, the discharge pressure of the coating material 4 is determined by the height H1 (depending on the height, the acceleration of gravity, and the position energy determined by the mass of the coating material 4).
[0100]
Also, as shown in FIG. 6B, when the position of the nozzle tank 51 is moved downward to the lowermost position in the vertical direction, the position of the ejection port 41 (the position of the bottom inside the nozzle tank 51) is changed. The height H2 up to the uppermost position of the coating material 4 (the uppermost position of the coating material 4 overflowing from the nozzle tank 51 to the collection tank 52) is greater than the height H1.
[0101]
Therefore, if H2 is made larger than H1, the discharge pressure of the coating material 4 becomes higher. In addition, if the position of the nozzle tank 51 is moved to an arbitrary position between the positions H1 and H2, it becomes possible to perform application at a discharge pressure corresponding to the position. As described above, by adjusting the position of the nozzle tank 51, the ink ejection pressure can be finely adjusted.
[0102]
(6): Modified example of flow rate limiting member
FIG. 7 is a view showing a modified example of the flow rate limiting member, and FIGS. This example is a modification of the flow rate limiting member 48 shown in FIG.
[0103]
(1): Modification 1
FIG. 7A illustrates a first modification. In this example, the flow rate limiting member 48 is provided with a triangular area which becomes thinner toward both ends of the outlet 41, and a large number of holes 60 are formed in the triangular area at predetermined intervals. In this way, the coating material passes through the portion of the hole 60, but the coating material cannot pass through other portions, and the flow rate is limited.
[0104]
(2): Modification 2
FIG. 7B is a diagram illustrating a second modification. In this example, the flow rate limiting member 48 is provided with a triangular area which becomes thinner toward both ends of the outlet, and a large number of horizontally long holes 61 are formed in the triangular area at predetermined intervals. By doing so, the coating material passes through the portion of the horizontally long hole 61, but the coating material cannot pass through other portions, and the flow rate is limited.
[0105]
(3): Modification 3
FIG. 7C is a diagram showing a third modification. In this example, the flow rate limiting member 48 is provided with a triangular area which becomes thinner toward both ends of the ejection port, and a number of vertically long holes 62 are formed in the triangular area at predetermined intervals. In this way, the coating material passes through the portion of the vertically long hole 62, but the coating material cannot pass through other portions, and the flow rate is limited.
[0106]
{Circle around (4)}: Modification 4
FIG. 7D is a diagram showing a fourth modification. In this example, the flow rate limiting member 48 is provided with a triangular area which becomes thinner toward both ends of the outlet, and a number of stepped holes 63 are formed at predetermined intervals in the triangular area. . In this way, the coating material passes through the stepped hole 63, but cannot pass through the other portions, and the flow rate is limited.
[0107]
(5): Modification 5
FIG. 7E is a diagram illustrating a fifth modification. This example is an example in which the flow rate limiting member 48 is provided with a triangular area which becomes thinner toward both ends of the ejection port, and a number of different slit ports 64 are provided at predetermined intervals in the triangular area. . In this way, the coating material passes through the slit 64, but the coating material cannot pass through other portions, and the flow rate is limited.
[0108]
(7): Explanation of the cleaning mechanism
8A and 8B show an example in which a cleaning mechanism is installed in the nozzle. FIG. 8A is an explanatory view of the nozzle, FIG. 8B is an example of a brush (front and side views), FIG. The figure shows an example of a scraper (front / side view).
[0109]
As shown in FIG. 8A, a guide plate 59 is provided inside the nozzle tank 51, and a rod 58 to which a cleaning mechanism 57 such as a brush, a squeegee, or a scraper is attached is moved along the guide plate 59 by an arrow shown in FIG. The nozzle tank 51 is provided so as to be able to move in the direction.
[0110]
In this case, the brush shown in FIG. 8B, the squeegee shown in FIG. 8C, the scraper shown in FIG. The inside of the nozzle tank 51 is cleaned by the cleaning mechanism 57 by moving the rod 58 in the direction of the arrow shown in the figure. By doing so, the inside of the nozzle tank 51 can be easily cleaned, and the adhesion of dirt is eliminated.
[0111]
(Note)
The following configuration is added to the above description.
[0112]
(Appendix 1)
In the curtain coater nozzle which sets the width of the ejection port of the coating material to a width corresponding to the inside of the member to be coated, and performs coating on the member to be coated with the coating curtain ejected from the ejection port,
By adjusting the discharge amount at both ends of the discharge port, a discharge control mechanism for discharging both ends of the coating curtain thinner from the center portion is provided,
A curtain coater nozzle, characterized in that the coating by the ejection adjusting mechanism enables coating on the member to be coated such that the film thickness of the coating material at both ends becomes the same height as the central portion.
[0113]
(Appendix 2)
The blowout adjusting mechanism includes:
Equipped with a mechanism that ejects both ends of the coating curtain thinly by making the both ends of the ejection port triangular and restricting the discharge amount of the coating material passing through the ejection port so that it is smaller at both ends than at the center The curtain coater nozzle according to (Supplementary Note 1), wherein
[0114]
(Appendix 3)
The blowout adjusting mechanism includes:
The nozzle port member is divided into two blocks, and the width of the ejection port is configured to be changeable as a divided slide mechanism in which the two blocks are slidably combined, and a mechanism for applying an arbitrary width is provided. (Claim 1).
[0115]
(Appendix 4)
The blowout adjusting mechanism includes:
At both ends of the outlet, a flow rate limiting member for limiting the flow rate of the coating material is provided, and both ends of the coating film are thinly blown out,
The curtain coater nozzle according to (Appendix 1), wherein the flow rate limiting member is configured to be movable in the width direction of the coating curtain, and the coating width can be arbitrarily set.
[0116]
(Appendix 5)
A nozzle member of the curtain coater, a separation tank for separating foam from the transferred coating material, a nozzle tank for storing the coating material sent from the separation tank and discharging the sprayed material from the outlet, and an overflow from the nozzle tank. And a collection tank for collecting the applied coating material,
The nozzle tank is provided with a foam separation mechanism for separating foam mixed into the coating material sent from the separation tank to separate bubbles, and only the coating material containing no bubbles is discharged from the ejection port.
The nozzle tank is provided so as to be slidable in the vertical direction with respect to the separation tank and the separation tank, and by adjusting the slide of the nozzle tank, it is possible to finely adjust the discharge pressure of the coating material discharged from the ejection port. A curtain coater nozzle according to (Appendix 1), wherein
[0117]
(Appendix 6)
The curtain coater nozzle according to claim 1, wherein a cleaning mechanism is movably installed in the nozzle port member, and the inside of the nozzle port member can be cleaned by moving the cleaning mechanism.
[0118]
As described above, according to the present invention, the following effects can be obtained.
[0119]
(1) In the first aspect, since the ejection amount at both ends of the ejection opening is adjusted to provide an ejection adjustment mechanism for ejecting both ends of the coating curtain thinner from the center portion, the application by the ejection adjustment mechanism is performed at the time of applying the coating material. Thus, the coating material can be applied to the member to be applied such that the thickness of the coating material at both ends is the same as the height of the central portion.
[0120]
With this configuration, the coating can be performed with a stable width inside the member to be coated. For this reason, both ends of the member to be coated are not stained, and the conveyor is not stained. In addition, the consumption of the application material can be reduced by the reduction in the application area.
[0121]
In addition, since the coating material at the coating boundary can be prevented from being thickened and rising, the drying unevenness can be prevented, and the coating material such as the photosensitive SR ink can be stably applied and dried. Further, the coating thickness of the coating curtain can be averagely applied, the application boundary can be closest to the required range, and the consumption of the coating material can be reduced.
[0122]
(2): In claim 2, the ejection adjusting mechanism makes the both ends of the ejection port triangular, and limits the amount of the coating material passing through the ejection port so that the amount of the coating material is smaller at the both ends than at the center. Therefore, a mechanism is provided for ejecting both ends of the coating curtain thinly. Therefore, it is possible to apply the coating material to the member to be applied such that the thickness of the coating material at both ends is the same as the height of the central portion.
[0123]
In addition, the coating can be performed with a stable width inside the member to be coated. For this reason, both ends of the member to be coated are not stained, and the conveyor is not stained. In addition, the consumption of the application material can be reduced by the reduction in the application area.
[0124]
(3): In claim 3, the ejection adjusting mechanism divides the nozzle port member into two blocks, and is configured to be able to change the width of the ejection port as a divided slide mechanism in which the two blocks are slidably combined. It has a mechanism to apply with an arbitrary width.
[0125]
Therefore, even if the width of the member to be coated is different, the coating can be performed with a stable width inside the member to be coated. For this reason, both ends of the member to be coated are not stained, and the conveyor is not stained. In addition, the consumption of the application material can be reduced by the reduction in the application area.
[0126]
(4) In the fourth aspect, the ejection adjusting mechanism is provided with a flow rate limiting member for limiting the flow rate of the coating material at both ends of the ejection port, so that both ends of the coating curtain are thinly blown out, and the flow rate is limited. The member is configured to be movable in the width direction of the coating curtain, and the coating width can be set arbitrarily.
[0127]
Therefore, it is possible to apply a stable width to the inside of the member to be applied. Further, even if the width of the member to be coated is different, the coating can be performed with a stable width inside the member to be coated. For this reason, both ends of the member to be coated are not stained, and the conveyor is not stained. In addition, the consumption of the application material can be reduced by the reduction in the application area.
[0128]
(5): In claim 5, the nozzle tank is provided with a bubble separation mechanism for separating bubbles mixed in the coating material sent from the separation tank, to separate the bubbles, and only the coating material containing no bubbles is blown out from the outlet. While discharging, the nozzle tank is provided so as to be slidable in the vertical direction with respect to the separation tank and the separation tank, and by adjusting the slide of the nozzle tank, the discharge pressure of the coating material discharged from the ejection port can be finely adjusted. I have.
[0129]
By doing so, it is possible to separate bubbles mixed in the coating material in the nozzle tank. Therefore, pinholes, bubble marks, and the like due to bubbles on the application surface can be reduced. In addition, the separation of bubbles mixed in the coating material in the nozzle tank and the fine adjustment of the coating pressure can be performed, so that the fine adjustment of the coating thickness can be stably performed. In this way, bubbles are separated from the application material to prevent entrapment, fine adjustment of the discharge pressure can be easily performed, and efficient and favorable application can be performed.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a nozzle port of a curtain coater according to an embodiment of the present invention. FIG. 1A is a nozzle port member of the curtain coater, and FIG.
FIGS. 2A and 2B show an example in which the width of the ejection port in the embodiment of the present invention is made variable. FIG. 2A shows a nozzle opening at the time of wide application, FIG. 2B shows a nozzle opening at the time of narrow application, and FIG. No. D is a sectional view of the nozzle at the time of narrow width application, FIG. E is a sectional view of the application at the time of wide width application, and FIG. F is a sectional view of the application at the time of narrow width application.
FIG. 3 is an example in which both ends of a coating film are spouted thinly in the embodiment of the present invention. FIG. 3A is a cross-sectional view of a nozzle port member, FIG. 3B is a cross-sectional view of coating, and FIG.
4A and 4B are examples in which the coating width in the embodiment of the present invention can be set arbitrarily; FIG. 4A is a cross-sectional view of a variable-sliding nozzle; FIG. This is a nozzle port with a narrowed member.
FIG. 5 is an explanatory diagram of a nozzle port member according to the embodiment of the present invention.
6A and 6B are explanatory diagrams of fine adjustment of discharge pressure in a case where bubbles are separated and discharge pressure is made uniform by a nozzle opening member according to an embodiment of the present invention. FIG. 6A shows an example in which the discharge pressure is reduced, and FIG. This is an example of increasing the pressure.
FIG. 7 is a modified example of the flow rate limiting member in the embodiment of the present invention, and FIGS. A to E show each modified example.
8 is an example in which a cleaning mechanism is installed in the nozzle according to the embodiment of the present invention. FIG. 8A is an explanatory view of the nozzle, FIG. 8B is an example of a brush (forward / side view), and FIG. D and D are examples of scrapers (front and side views).
FIG. 9 is an explanatory diagram of Conventional Example 1.
FIG. 10 is an explanatory diagram of Conventional Example 2.
FIG. 11 is an explanatory diagram of Conventional Example 3.
FIG. 12 is an explanatory diagram of Conventional Example 4.
FIG. 13 is an explanatory diagram of Conventional Example 5.
[Explanation of symbols]
1 nozzle
2 cradle
3 Member to be coated
4 Application material
11 Liquid curtain
12 arrows
13 Substrate
14 Curtain holder
15 The end of the curtain
16 penetration band
17 Central part of curtain
18 Coating
19 Uncoated area
20 opening
21 Outlet
25 paint
26 Plate
27 Knife Edge
28 Limit plate
29 Application material at application boundary
35 storage tanks
36 Side wall
37 Bottom opening
38 Downstream
40 Nozzle port member
41 spout
42 Taper
44 First Block
45 Second Block
46 Holder
48 Flow rate limiting member
51 Nozzle tank
52 Collection tank
53 mesh member
54 Inclined plate
55 separation tank
56 bubbles
59 Guide plate
60 holes
61 Horizontal hole
62 vertical hole
63 stepped hole
64 slit mouth

Claims (5)

In the curtain coater nozzle which sets the width of the ejection port of the coating material to a width corresponding to the inside of the member to be coated, and performs coating on the member to be coated with the coating curtain ejected from the ejection port,
By adjusting the discharge amount at both ends of the discharge port, a discharge control mechanism for discharging both ends of the coating curtain thinner from the center portion is provided,
A curtain coater nozzle, characterized in that the coating by the ejection adjusting mechanism enables coating on the member to be coated such that the film thickness of the coating material at both ends becomes the same height as the central portion. The blowout adjusting mechanism includes:
Equipped with a mechanism that ejects both ends of the coating curtain thinly by making both ends of the ejection port triangular and restricting the discharge amount of coating material passing through the ejection port so that it is smaller at both ends than at the center The curtain coater nozzle according to claim 1, wherein: The blowout adjusting mechanism includes:
The nozzle port member is divided into two blocks, and the width of the ejection port is configured to be changeable as a divided slide mechanism combining the two blocks so as to be slidable, and a mechanism for applying an arbitrary width is provided. The curtain coater nozzle according to claim 1, wherein The blowout adjusting mechanism includes:
At both ends of the ejection port, a flow rate limiting member for limiting the flow rate of the coating material is provided, and both ends of the coating curtain are thinly blown out,
The curtain coater nozzle according to claim 1, wherein the flow rate restricting member is configured to be movable in the width direction of the coating curtain, and the coating width can be set arbitrarily. A nozzle member of the curtain coater, a separation tank for separating foam from the transferred coating material, a nozzle tank for storing the coating material sent from the separation tank and discharging the sprayed material from the outlet, and an overflow from the nozzle tank. And a collection tank for collecting the applied coating material,
The nozzle tank is provided with a foam separation mechanism that separates bubbles mixed into the coating material sent from the separation tank to separate the bubbles, and only the coating material containing no bubbles is discharged from the ejection port,
The nozzle tank is provided so as to be slidable in the vertical direction with respect to the separation tank and the separation tank, and by adjusting the slide of the nozzle tank, it is possible to finely adjust the discharge pressure of the coating material discharged from the ejection port. The curtain coater nozzle according to claim 1, wherein:

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