JP2003033712A - Apparatus and apparatus for cleaning coating head - Google Patents

Abstract

(57) [Problem] To provide an application head cleaning apparatus and a method for removing an excessive application liquid adhering to the tip of an application head to obtain an application surface free of foreign matter and unevenness. A cleaning device (6) for a coating head (7) constituting a die coating type coating device, which is unwound from an unwinding (8) and has tapered portions (2a, 2) at the tip of the coating head.
b, a cleaning liquid supply pipe 10a, 10b for impregnating the cleaning sheet 9 with a cleaning liquid, and a taper portion 2a, The cleaning sheet 9 includes a wiping block 11a, 11b for wiping excess coating liquid of 2b, and the cleaning sheet 9 is composed of one cleaning sheet 9 with one roll, and a cleaning device 6 of a coating head for cleaning both sides of the head. It is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating head cleaning apparatus used for removing an excess coating liquid adhering to a coating head of a die coating type coating apparatus, and a method therefor.

[0002]

2. Description of the Related Art Conventionally, there has been the following apparatus for cleaning a coating head used to remove an excessive coating liquid adhering to the coating head of the coating apparatus. For example, as in the device disclosed in Japanese Patent Laid-Open No. 2000-15165, a cleaning roll that allows a cleaning liquid to pass therethrough is provided below the tip of the coating head, and a scraper that is in contact with the cleaning roll is provided. By rotating a cleaning roll moistened with cleaning liquid while contacting the tip of the coating head, the coating liquid adhering to the tip of the head is transferred to the cleaning roll, and the waste liquid can be scraped off by a scraper in contact with the cleaning roll. Has become.

Further, as another apparatus for cleaning the coating head, as in the apparatus described in Japanese Patent Laid-Open No. 7-80386, a pipe through which a cleaning liquid can be passed is provided below the tip of the coating head, and there is no pipe. A cleaning sheet made of dust cloth is wound around, and the cleaning liquid impregnated with the cleaning liquid supplied from the pipe is brought into contact with the cleaning sheet to wipe the coating liquid at the tip of the coating head.

However, the above-mentioned conventional technique has the following problems. That is, at the tip of the coating head, as shown in FIG. 5, a block having flat portions 1a and 1b having a width of several hundred μm and taper portions 2a and 2b connected to the flat portions 1a and 1b are separated by a slit gap 3 and two blocks are assembled to face each other. When the coating head 7 is used to perform coating, the coating liquid 4 often adheres not only to the flat portions 1a and 1b at the head tip but also to the tapered portions 2a and 2b due to surface tension. However, in the above-mentioned prior art, the taper portion 2a,
No consideration is given to the removal of the coating liquid 4 adhering to 2b. Therefore, when the coating liquid 4 remains attached to the taper portions 2a and 2b, particularly in the case of intermittent coating, the coating start ends become uneven as shown in FIG. 7, which causes unevenness 5, and FIG. As shown in the drawing, a thick film portion (20) was generated at the coating start end, and the film thickness was increased, resulting in a problem of poor film thickness.
Further, there is a problem that the coating liquid 4 attached to the taper portions 2a and 2b is left to be solidified and dried, and eventually falls and adheres to the coating surface to cause coating failure. The flat portion 1a at the tip of the head shown in FIG.
There is also a problem that foreign matter adhering to the cleaning material or dust of the cleaning material itself enters into the slit gap 3 to bring the cleaning material into contact with 1b and is discharged to the coating surface, resulting in poor coating. It was

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art. The object of the present invention is to remove the excess coating liquid adhering to the tip of the coating head. It is an object of the present invention to provide a coating head cleaning device and a method thereof, which can obtain a uniform coating surface free from foreign matter and unevenness.

[0006]

In order to achieve the above object in the present invention, first, in the invention of claim 1, there is provided a cleaning device for a coating head which constitutes a coating device of a die coating system, wherein the unwinding portion is provided. A cleaning sheet that is unwound from the application head and is wound up in the winding section while contacting the taper section at the tip of the coating head; a cleaning solution supply pipe that impregnates the cleaning sheet with a cleaning solution; and a cleaning sheet that is impregnated with the cleaning solution. The coating head cleaning device comprises a wiping block for wiping off excess coating liquid on the taper portion at the tip of the coating head.

Further, according to the invention of claim 2, the width of the cleaning sheet is equal to or more than the width of the coating head in the longitudinal direction. .

Further, in the invention of claim 3, the cleaning sheet is a roll of one roll from the unwinding portion to the winding portion, and one surface of the cleaning sheet is one taper of the tip of the coating head which is the object to be cleaned. 3. The coating head according to claim 1, further comprising a mechanism for contacting and cleaning and then inverting it through a guide roll so that the other surface comes into contact with the other taper of the tip of the coating head for cleaning. This is a cleaning device.

The invention according to claim 4 further comprises an adjusting mechanism for adjusting the feeding length from the unwinding portion to the winding portion of the cleaning sheet. This is a cleaning device for the coating head.

Further, according to a fourth aspect of the present invention, there is provided a method for cleaning a coating head which constitutes a die coat type coating apparatus, wherein the cleaning device for the coating head is used to roll out a roll shape. After the cleaning sheet is impregnated with the cleaning liquid, the excess coating liquid at the tip of the coating head is wiped off by feeding the cleaning sheet while contacting the taper portion at the tip of the coating head. It is a thing.

The above-mentioned cleaning device, which is a feature of the present invention, operates as follows. That is, after impregnating the cleaning liquid in a roll-shaped cleaning sheet having a width equal to or greater than the longitudinal width of the coating head with the cleaning liquid, the taper portion at the tip of the coating head is fed while the cleaning sheet impregnated with the cleaning liquid is sent out, With the feeding operation, the excess coating liquid adhering to the tip of the coating head can be wiped across the entire width in the longitudinal direction.At this time, the cleaning sheet does not come into contact with the flat part of the tip of the coating head, and the cleaning liquid impregnated in the cleaning sheet is wiped. Foreign matter does not enter the slit of the coating head because it is adsorbed by.

Further, since the cleaning sheet is a single sheet that is unwound from a single roll, the unwinding and winding mechanism can be simplified by one and the cleaning sheet can be easily replaced. , One side of which is cleaned by contacting it with one taper of the tip of the coating head, which is the object to be cleaned, and then inverting it through a guide roll, and the other surface is contacted with the other taper of the tip of the coating head for cleaning. Since the above-described mechanism is used, a coating head cleaning device that does not leave unwiped portion can be obtained by wiping the coating liquid adhering to the tapered portions on both sides of the tip of the coating head in the tip direction.

Furthermore, the cleaning sheet is
Since it has an adjusting mechanism that adjusts the unwinding length from unwinding to winding, it is a single sheet that is unrolled from one roll, but the taper at the tip of one application head is wiped off. It is possible to avoid wiping off the other taper portion, so that it is possible to provide a coating head cleaning device in which the coating recovery liquid once attached to the cleaning sheet is not redeposited.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. The present invention, as shown in the side view of FIG. 1, is a coating head cleaning device 6 used for removing an excess coating liquid 4 adhering to the tip end of a coating head 7 of a die coating type coating device, and its cleaning. It is about the method.

The cleaning device 6 is installed, for example, over the entire width in the longitudinal direction on the tip end side of the coating head 7, and the cleaning device is fed from an unwinding device 8 connected to a drive control device such as a motor or a brake (not shown). The sheet 9 is hung so as to come into contact with the one cleaning liquid supply pipe 10a, then passes through the upper surface of the one wiping block 11a, passes through the guide roll 12a, the length adjusting roll 13, the guide roll 12b, and the guide roll 12c, After coming into contact with the other cleaning liquid supply pipe 10b, it passes through the upper surface of the other wiping block 11b and is connected to a drive control device (not shown) such as a motor or a brake.
Is wrapped around.

Here, the cleaning liquid supply pipes 10a, 10b are provided with a supply hole 16 on the side of the cleaning sheet 9 in contact therewith.
Are provided at several positions, and a suitable amount of cleaning liquid is supplied to and impregnated into the cleaning sheet 9 by connecting a liquid supply means (not shown) such as a pump. Further, the adjusting roll 13 is installed so that its position can be moved in the direction of arrow A or B in the figure, and if it is moved in the direction of arrow A, the feeding length from the unwinding 8 to the winding 14 can be lengthened. It can be shortened by moving in the direction of arrow B.

As shown in the perspective view of FIG. 3, the cleaning sheet 9 has a width (W) equal to or larger than the longitudinal width Y of the coating head 7, and its material is, for example, none. Dust cloth can be used.

Further, the cleaning liquid supply pipe 10a shown in FIG.
10b, the wiping blocks 11a and 11b, and the guide rolls 12a, 12b, and 12c can be prevented from being recontaminated by the coating recovery liquid adhering to the cleaning sheet 9 by coating or plating the surfaces thereof with a fluororesin or the like. .

Next, the operation of the coating head cleaning device 6 of the present invention will be described. First, the coating head 7 shown in FIG.
After the coating is finished or just before the coating is started, the cleaning device 6 around which the cleaning sheet 9 is wound as shown in FIG. 2 is moved so that the taper portions 2a and 2b at the tip of the head come into contact with the wiping blocks 11a and 11b. To be made. At this time, since the wiping blocks 11a and 11b are supported by the main body of the apparatus through elastic bodies 15a and 15b such as springs, the wiping blocks 11a and 11b are pressed with appropriate pressure.
The cleaning sheet 9 on a and 11b can be pressed against the taper portions 2a and 2b at the tip of the head. At this time, the cleaning sheet 9 is stopped, and in this state, the cleaning sheet 9 is impregnated by discharging an appropriate amount of the cleaning liquid from the supply holes 16 of the cleaning liquid supply pipes 10a and 10b.

Next, as shown in FIG. 4, the unwinding unit 8 and the winding unit 14 are driven to feed the cleaning sheet 9 in the direction of arrow C by a fixed length L. By this operation, the excess coating liquid attached to the taper portions 2a and 2b of the coating head 7 shown in FIG. 2 is wiped off by the clean sheet 9 and the coating liquid attached to the flat portions 1a and 1b is also adsorbed. Then, as shown in FIG. 4 again, the cleaning sheet 9 is sent out in the direction of arrow C for a certain length L and then stopped. The cleaning operation is completed by these series of operations, and the application head can perform the next application.

Here, a method of moving the position of the adjusting roll 13 will be described. FIG. 4 is a schematic diagram showing the unwinding length from the unwinding 8 to the winding 14 of the cleaning sheet 9 used in the coating head cleaning device of one example of the present invention. According to this, for example, the cleaning sheet 9 fed from the unwinding 8 is first fed by the wiping length L while contacting the taper portion 2a of the coating head 7 shown in FIG. After that, the cleaning sheet 9 is wiped off with a space of L, so that the wiping portion of the taper portion 2a to the wiping portion of the taper portion 2b is intermittently contaminated with the coating recovery liquid 17. Here, as is apparent in the figure, the cleaning sheet 9
In the above, when the wiped portion of the taper portion 2a is the front surface, the wiped portion of the taper portion 2b is the back surface, but the coating recovery liquid 17 adhering to the front surface permeates to the back surface.
Since the amount of the excess coating liquid 4 varies depending on the type of coating liquid and the coating conditions, it is preferable to change the wiping length L as well. Therefore, by moving the position of the adjusting roll 13 in the direction of arrow A or B, the distance M from the wiping start position F of the taper portion 2a to the wiping start position K of the taper portion 2b becomes an odd multiple of the wiping length L. By doing so, the taper portion 2b can be wiped off at a portion which is not used for wiping off the taper portion 2a, and reattachment of the coating / collecting liquid 17 to the taper portion 2b can be prevented.

[0022]

Since the present invention has the above-mentioned constitution, it has the following effects. That is, according to the coating head cleaning device of the present invention, while the cleaning liquid is impregnated into the roll-shaped cleaning sheet having a width equal to or larger than the longitudinal width of the coating head, the cleaning sheet is brought into contact with the tapered portion of the coating head. By sending out, the excess coating liquid adhering to the tip of the coating head was wiped across the entire width in one feeding operation, and at this time, the flat sheet at the tip of the coating head did not come into contact with the cleaning sheet and was impregnated into the cleaning sheet. Since it is adsorbed by the cleaning liquid, it is possible to prevent foreign matter from entering the slit.

On the other hand, since the cleaning sheet is a single sheet fed from one roll,
It has a simple structure such as one winding / unwinding roll, and facilitates replacement of the cleaning sheet, and one surface of the cleaning sheet can be brought into contact with one taper of the tip of the application head, which is the object to be cleaned. After cleaning, it is turned over via a guide roll and the other surface is brought into contact with the other taper of the tip of the coating head to clean it.Therefore, the coating liquid adhering to the taper part on both sides of the tip of the coating head is moved in the tip direction. By making it possible to obtain a uniform coating surface free from foreign matter and unevenness, it is possible to obtain a cleaning device for the coating head that is not wiped off.

Further, since the feeding length of the cleaning sheet from the unwinding to the winding can be adjusted, even though the cleaning sheet is one sheet unrolled from one roll, the tip of one coating head Since it is possible to avoid wiping off the other taper portion at the portion where the taper portion is wiped off, the coating recovery liquid once attached to the cleaning sheet is not redeposited.

Therefore, the present invention is excellent in practical use as a die coat type coating head cleaning device capable of removing the excess coating liquid adhering to the tip of the coating head and obtaining a uniform coating surface free from foreign matter and unevenness. Exert the above effect.

[Brief description of drawings]

FIG. 1 is an explanatory side view showing an embodiment of a coating head cleaning device of the present invention.

FIG. 2 is a side view illustrating an embodiment of a cleaning method using the coating head cleaning device of the present invention.

FIG. 3 is a perspective view illustrating an embodiment of a cleaning sheet that constitutes a cleaning device for a coating head according to the present invention.

FIG. 4 is an explanatory diagram schematically showing the delivery length of a cleaning sheet that constitutes the cleaning device for the coating head of the present invention.

FIG. 5 is an enlarged side view illustrating an embodiment of the coating head relating to the coating head cleaning device of the present invention.

FIG. 6 is a side view showing a coating state by a coating head according to the present invention.

FIG. 7 is a top view showing a coating state by a coating head according to the present invention.

[Explanation of symbols]

1a, 1b ... Flat portion at the tip of the coating head 2a, 2b ... Tapered portion at the tip of the coating head 3 ... Slit gap 4 ... Coating liquid 5 ... Unevenness 6 ... Coating head cleaning device 7 ... Coating head 8 Unwinding 9 Cleaning sheet 10a, 10b Cleaning liquid supply pipe 11a, 11b Wiping block 12a, 12b, 12c Guide roll 13 Adjusting roll 14 Winding 15 Elastic body 16 Supply hole 17 Coating recovery liquid 18 Coating material 19 Thin film 20 Thick film portion F when coating is started F Tapered portion 2a Wiping start position K ... Tapered portion 2b Wiping start position L ... Wiping Length M ... Distance between taper 2a wiping start point and 2b wiping start point Y ... Width of coating head in longitudinal direction W ... Width of cleaning sheet

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B08B 1/00 B08B 1/00 4F042 3/04 3/04 Z 7/04 7/04 AF Term (Reference) ) 3B116 AA47 AB54 BA01 3B201 AA08 AB32 BA01 BB22 BB92 CC14 4D073 AA01 BB03 CC09 4D075 AC02 AC72 AC86 AC97 BB01X BB65X CA47 DA04 EA07 4F041 AA12 AB02 BA05 BA60 4F042 AA22 CC08 CC10 CC11 DA01

Claims (5)

[Claims] 1. A cleaning device for a coating head constituting a die coating type coating device, the cleaning sheet being unwound from an unwinding part and wound in a winding part while contacting a taper part at the tip of the coating head. And a cleaning liquid supply pipe for impregnating the cleaning sheet with the cleaning liquid, and a wiping block for wiping off the excessive coating liquid on the taper portion of the tip of the coating head while contacting the cleaning sheet impregnated with the cleaning liquid. Characteristic coating head cleaning device. 2. The cleaning device for a coating head according to claim 1, wherein the width of the cleaning sheet is equal to or greater than the width of the coating head in the longitudinal direction. 3. The cleaning sheet is a roll of one roll from the unwinding portion to the winding portion, one surface of which is contacted with one taper of the tip of the application head, which is the object to be cleaned, and then cleaned. 3. A mechanism for reversing through a guide roll, the other surface being in contact with the other taper of the tip of the coating head for cleaning.
The coating head cleaning device described. 4. The apparatus for cleaning a coating head according to claim 1, further comprising an adjusting mechanism for adjusting the payout length of the cleaning sheet from the unwinding portion to the winding portion. 5. A method of cleaning a coating head constituting a die coating type coating apparatus, wherein a cleaning liquid is impregnated into a roll-shaped cleaning sheet unwound from an unwinding section by using the apparatus for cleaning the coating head. After that, a cleaning sheet is fed while a cleaning sheet is brought into contact with the taper portion of the tip of the coating head to wipe off excess coating liquid on the tip of the coating head.