JPH07256185A - Coating applicator and coating applying and washing method using the same - Google Patents

Abstract

PURPOSE:To wash an extrusion coating applying head of a coating applicator having the extrusion coating applying head for discharging a coating liquid from a slit and applying the liquid on the surface of a base and improve the coating application operation by installing a washing liquid supplying means on the upstream side of the base transporting direction of the slit. CONSTITUTION:This extrusion coating applying head 2 is formed of a front, center and back respective edges 10, 11, 12. In the meantime, a pocket 16 for the coating liquid and a slit 17 for supplying the coating liquid are formed longitudinally between the center and back respective edges over the entire width. In such a case, a pocket 14 for the washing liquid and a slit 15 for supplying the washing liquid are formed as washing liquid supplying means between the front and center respective edges 10 and 11 on the upstream side of the slit 17 for supplying the coating liquid respectively in the longitudinal direction of the extrusion coating applying head 2 over the entire width. The washing liquid discharged from the slit 15 for the washing liquid is so transferred as to follow up the transportation of the base to coat the front end of the slit 17 for supplying the coating liquid on the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus and a coating / cleaning method, and particularly to cleaning the tip of a coating head of a coating apparatus in parallel with coating on a support without stopping the supply of coating liquid. The present invention relates to a coating apparatus and a coating / washing method using the coating apparatus, which can prevent fluctuations in coating film thickness, coating unevenness, coating coating streaks, and the like.

[0002]

2. Description of the Related Art Conventionally, various methods such as a roll coating method, a gravure coating method, a slide bead coating method and a doctor coating method have been used as a method for applying a coating liquid on a support. In recent years, the extrusion coating method has attracted attention because it has high operability and excellent controllability of the thickness of the coating film.

In the extrusion coating method, the edge surface of the extrusion coating head is pressed so that a predetermined tension is applied to the support between transporting means such as support rolls, and the coating solution is extruded from the coating solution supply slit. The coating is performed by controlling the gap between the extrusion coating head and the support according to the change in the extrusion amount to control the coating to have a predetermined film thickness.

In the case of single layer coating, for example, the extrusion coating head used for such extrusion coating usually comprises a front edge (upstream side in the support carrying direction) and a back edge (downstream side in the support carrying direction). Between the edge and the back edge, a pocket (coating liquid pool) and a slit for supplying the coating liquid, which is continuous with the pocket, are formed, and the coating liquid is continuously discharged from the slit to coat the surface of the support.

However, in this extrusion coating method, when the coating solution is continuously discharged for a long time to perform coating,
It is unavoidable that excess coating liquid adheres to and solidifies on the periphery of the tip (ejection port) of the coating liquid supply slit of the extrusion coating head. Therefore, this causes a coating unevenness, a coating streak defect, and the like, and there is a problem that a uniform coating thickness cannot be obtained.

In order to solve such a problem, conventionally,
For example, a method of removing deposits on the surface of a support, in which a necessary amount of solvent is applied to the support in advance, and the deposits on the support are removed together with the solvent by pressing the plate before the solvent evaporates. (Tokuhei 3-379
No. 88), and a coating apparatus (Japanese Patent Laid-Open No. 2-9473) in which a die (extrusion coating head) main body is provided with a cleaning means for cleaning a coating liquid pool (pocket) and the like.

[0007]

However, the method disclosed in Japanese Patent Publication No. 3-37988 is intended to remove the deposits on the support. Further, in the coating device disclosed in Japanese Patent Application Laid-Open No. 2-9473, the slit for discharging the cleaning liquid and the slit for discharging the coating liquid are common (in this publication, “flow groove”). It is not possible to simultaneously perform the step of coating the support and the step of washing the coating apparatus by using. for that reason,
When it becomes necessary to clean the inside of the slit, or when the excess coating liquid adheres to the slit discharge port and solidifies to clean the tip of the coating head, the coating supply must be stopped. However, there is a problem that work efficiency is reduced.

The present invention has been made in view of the above circumstances, and in particular, the tip of the coating head of the coating apparatus can be washed in parallel with the coating on the support without stopping the supply of the coating liquid. This provides a coating apparatus and a coating / washing method using the coating apparatus, which can prevent the variation of coating film thickness, coating unevenness, coating streak defects, etc., and enable uniform coating film formation. The purpose is to do.

[0009]

In order to achieve the above object, according to the present invention, coating provided with an extrusion coating head for continuously extruding a coating solution from a coating solution supply slit and coating the surface of a support. In the apparatus, there is provided a coating apparatus characterized in that cleaning liquid supply means is provided on the upstream side of the coating solution supply slit of the extrusion coating head in the support carrying direction. Thus, by providing the cleaning liquid supply means separately from the coating liquid supply slit, the extrusion coating head can be cleaned in parallel at the same time without stopping the step of coating the support. Further, by providing the cleaning liquid supply means on the upstream side of the coating liquid supply slit,
The cleaning liquid discharged from the slit is sent in the downstream direction so as to be accompanied by the conveyance of the support, whereby the tip (upper surface) of the extrusion coating head including the coating liquid supply slit tip provided on the downstream side is changed by the cleaning liquid. From being covered,
Excessive coating liquid adhering to the periphery of the coating liquid supplying slit can be reliably and efficiently removed and cleaned together with the cleaning liquid.

Further, according to the present invention, by using the above coating apparatus, the coating liquid is continuously discharged from the coating liquid supply slit of the extrusion coating head to coat the surface of the running support, and the cleaning liquid is supplied. There is provided a coating / cleaning method, characterized in that a cleaning liquid is discharged from the means at predetermined time intervals to clean the tip of the extrusion coating head. By discharging the cleaning liquid at predetermined time intervals, it is possible to regularly clean and remove the excess coating liquid adhering to the tip of the extrusion coating head, without causing it to solidify. It is possible to surely prevent the occurrence of. Further, if this predetermined time interval is set to a time for which a support portion which is not commercialized in an actual manufacturing line such as a joint portion (seam portion) of the support passes through the coating head, waste of the product is caused. It can be applied and washed without using. In addition, the joint portion (seam portion) of the support here is, in the actual coating step of the support, usually when the feeding of the support from the feeding roll is completed and is replaced with the next feeding roll, The rear end of the previous support and the front end of the next support are automatically joined, and this joining portion is referred to.

The specific structure of the present invention will be described below.

FIG. 1 is a schematic block diagram showing an example of the coating apparatus of the present invention. In FIG. 1, a coating apparatus 1 includes an extrusion coating head 2 and a drying apparatus 3, and a delivery roll 5 around which a support 4 before coating is wound is disposed on the upstream side of the extrusion coating head 2, and a drying apparatus 3 is provided. A take-up roll 6 that winds up the coated support 4 that is conveyed is disposed on the downstream side of the. In the figure, 7 is a guide roll.

FIG. 2 is an external perspective view of the extrusion coating head 2 in the case of single layer coating, and FIG. 3 is a sectional view of the extrusion coating head shown in FIG. 2 and 3, the extrusion coating head 2 comprises a front edge 10, a center edge 11 and a back edge 12, and between the center edge 11 and the back edge 12, a pocket for coating liquid (a pool of coating liquid) 16 and A slit 17 for supplying a coating liquid is formed in communication with the extrusion coating head 2 over the entire width thereof in the longitudinal direction. This coating solution pocket 16 is
A coating solution pocket 16 communicating with a coating solution flow path (not shown) opened at a predetermined position on the wall surface of the back edge 12 and passing through the coating solution flow path from an external coating solution supply system (not shown).
The coating liquid is once fed to the substrate, and the coating liquid is discharged from the coating liquid supply slit 17 to the surface of the support at a flow rate corresponding to the fluid pressure of the coating liquid at this time. In addition,
The slit width of the coating liquid supply slit 17 is usually set to about 100 to 150 μm in coating the magnetic recording medium.

Between the front edge 10 and the center edge 11 on the upstream side of the coating liquid supply slit 17, as a cleaning liquid supply means, a cleaning liquid pocket (cleaning liquid pool) 14 and a cleaning liquid supply slit 15 communicating therewith are respectively provided. It is formed over the entire width in the longitudinal direction of the extrusion coating head 2. The cleaning liquid pocket 14 communicates with a cleaning liquid flow path (not shown) that opens at a predetermined position on the wall surface of the front edge 10, and passes through the cleaning liquid flow path (not shown) from an external cleaning liquid supply system (not shown). 1
The cleaning liquid is once fed to the cleaning liquid 4, and the cleaning liquid is discharged from the cleaning liquid supply slit 15 at a flow rate corresponding to the fluid pressure of the cleaning liquid at this time.

In the present invention, the cleaning liquid supply slit 15 must be provided on the upstream side of the coating liquid supply slit 17 in the support carrying direction. By doing so, the cleaning liquid ejected from the cleaning liquid supply slit 15 is sent so as to be drawn in the downstream direction so as to be accompanied by the conveyance of the support 4, and the coating liquid supply slit 17 formed on the downstream side is sent. The tip (upper surface) of the extrusion coating head 2 including the tip (ejection port) is covered with the cleaning liquid. Therefore, it is possible to reliably and efficiently remove and wash the excess coating liquid adhering here together with the cleaning liquid, and to prevent occurrence of coating unevenness, coating streak defects, etc. on the coating film. it can. Cleaning liquid supply slit 1
The slit width and the like of No. 5 are not particularly limited, and may be substantially the same as the slit width of the coating liquid supply slit 17.

In the extrusion coating head, the front edge is usually set to have a lower upper end (tip) surface than the center edge, back edge, etc. provided on the downstream side, so that the coating liquid on the surface of the support is It is designed to prevent abrasion of the front edge tip during coating. In the present invention, the cleaning liquid supply slit 15 is provided between the front edge 10 and the center edge 11, but in this case, the upper end surface 10a (FIG. 3) of the front edge 10 has a difference in viscosity between the coating liquid and the cleaning liquid. In view of the above, it is preferable to set it lower than in the case of discharging the coating liquid.

The extrusion coating head 2 can be made of the same material as the conventional extrusion coating head, for example, stainless steel or cemented carbide material.

The method of the present invention for coating and cleaning the support using the extrusion coating head 2 will be described below.

In the extrusion coating head 2 described above, the coating liquid is supplied from the external coating liquid supply system to the coating liquid pocket 16 through the coating liquid flow path. The supply of the coating liquid to the coating liquid pocket 16 is performed from one end of the coating liquid pocket 16 and from both ends of the coating liquid pocket 16.
Alternatively, any supply method such as supply from the intermediate portion of the coating solution pocket 16 may be used.

The coating liquid supplied to the coating liquid pocket 16 is discharged from the tip (discharge port) of the coating liquid through the slit 17 for supplying the coating liquid, and is fed from the back edge 12 and the feeding roll 5 and conveyed. It is continuously supplied to the gap between the supporting body 4 and the supporting body 4. Then, the gap between the support 4 and the back edge 12 is set by the supply amount of the coating liquid, the tension of the support 4 with respect to the extrusion coating head 2, and the coating liquid is coated on the support 4.

At this point, when the feeding of the support 4 from the feeding roll 5 is completed and the next feeding roll is replaced,
The rear end of the front support 4 and the front end of the next support 4 are automatically joined to each other for application, but this joint (seam) is not the target of final production.

Therefore, for example, when the joint portion (seam portion) of the support 4 passes through the coating liquid supply slit 17 of the extrusion coating head 2, the cleaning supply slit 15 is simultaneously formed.
Set to discharge the cleaning liquid from. When the cleaning liquid is discharged, the cleaning liquid is sent in the downstream direction so as to accompany the conveyance of the support 4, and the upper ends of the center edge 11 and the back edge 12 arranged on the downstream side, that is, for supplying the coating liquid. The excess coating liquid attached around the tip (ejection port) of the slit 17 is covered.

At this time, the support 4 is extruded and the coating head 2 is extruded.
May or may not be separated from.

When the support 4 is separated from the extrusion coating head 2, for example, a brush, a brush or the like is used in this gap,
The adhered coating liquid is swept off together with the cleaning liquid to remove it. The excess coating liquid that has adhered is entirely covered with the cleaning liquid, so that it can be easily removed. Further, by discharging the cleaning liquid at a predetermined time interval, it is possible to remove the excess coating liquid adhering to the upper surface of the extrusion coating head by solidification of the coating liquid by solidification of these coating liquids by coating for a long time. It is possible to prevent the occurrence of uneven coating, defective coating streaks and the like. Further, if the cleaning liquid is discharged when the support-bonded portion that is not originally a target for commercialization passes through the extrusion coating head, it is possible to eliminate waste in the manufacturing process.
Further, the extrusion coating head can be cleaned at the same time without stopping the coating step, which is efficient.

On the other hand, when the support 4 is not separated from the extrusion coating head 2, the extrusion coating head 2 itself is swung, and the swinging is used to remove the excess coating liquid attached together with the cleaning liquid. Remove. Also in this case,
The same effect as in the case of separating the above can be obtained. The method of rocking is not particularly limited, and any method may be used as long as the above effects are exhibited. Specifically, for example, a method in which the extrusion coating head 2 itself is rocked back and forth or while being rotated can be mentioned.

The cleaning liquid is supplied through the slit 15 for supplying the cleaning liquid.
It is preferable to discharge the extrusion coating head 2 over the entire width in the longitudinal direction of the extrusion coating head 2 because the cleaning efficiency is improved.

Although the case of single layer coating has been described above, an extrusion coating head for multilayer (two layers in the illustrated example) coating as shown in FIG. 4 can be used in the present invention.

The extrusion coating head 20 shown in FIG.
Front edge 21, two center edges 22, 23
And the back edge 24, the center edge 22
Between the center edge 23 and the back edge 24, the first layer (lower layer) of the coating solution pocket (coating solution pool) 27 and the slit 28 for supplying the coating solution in communication therewith are provided between the center edge 23 and the back edge 24. A coating solution pocket (coating solution pool) 29 for the second layer (upper layer) and a coating solution supply slit 30 communicating with it are respectively provided in the extrusion coating head 2
It is formed over the entire width in the longitudinal direction of 0. Then, between the front edge 21 and the center edge 22 on the upstream side of the coating liquid supply slits 28 and 30, the cleaning liquid pocket 25 and the cleaning liquid supply slit 2 communicating therewith are formed.
6 is formed. These coating solution pockets 27, 2
The operations of 9, the coating liquid supply slits 28 and 30, the cleaning liquid supply slit 26, and the cleaning liquid pocket 25 are basically the same as those in the case of the single layer coating described in FIGS. That is, during cleaning, the coating liquid supply slit 28 for the first layer and the coating liquid supply slit 3 for the second layer are provided.
0, the cleaning liquid is discharged from the cleaning liquid supply slit 26 without stopping the discharge of the coating liquid, and the periphery of the opening end of the coating liquid supply slit 28 and the coating liquid supply slit 30.
The excess coating liquid adhering to the vicinity of the opening end of the above is covered with a cleaning liquid, and the excess coating liquid is removed by the same method as in the case of the above single layer coating, with or without separating the support.

In the above embodiment, the example in which the cleaning liquid supply slit and the cleaning liquid pocket are provided in the main body of the extrusion coating head has been described, but in the present invention, the cleaning liquid supply means is the coating liquid supply slit of the extrusion coating head. It may be provided on the upstream side of. Therefore, for example, a cleaning liquid supply unit (for example, an injection nozzle) that discharges the cleaning liquid may be provided on the upstream side of the front edge separately from the extrusion coating head.

FIG. 5 shows an example in which a spray nozzle 33 as a cleaning liquid supply means is separately provided on the upstream side in the support carrying direction of a normal extrusion coating head 30 having only a pocket 31 for supplying a coating liquid and a slit 32. is there. In this case as well, cleaning can be performed in the same manner as in each of the above embodiments. That is, during cleaning, the slit 3 of the extrusion coating head 30 is used.
While continuing to discharge the coating liquid from No. 2, the cleaning liquid is discharged from the spray nozzle 33, and the excess coating liquid adhering to the vicinity of the opening end of the slit 32 of the extrusion coating head 30 is covered with the cleaning liquid, and the support 4 is removed. With or without spacing,
Remove excess coating liquid.

FIG. 6 shows an example in which a cleaning head 45 as a cleaning liquid supply means is provided on the upstream side of a normal extrusion coating head 40 having only a pocket 41 for supplying a coating liquid and a slit 42 in the support conveying direction. . This cleaning head 45
Has a pocket 46 and a slit 47 for supplying the cleaning liquid therein.
Is formed. In this case as well, cleaning can be performed in the same manner as in each of the above embodiments. That is, at the time of cleaning, while the discharge of the coating liquid from the slit 47 of the extrusion coating head 40 is continued, the cleaning liquid is discharged from the slit 47 of the cleaning head 45 and adheres around the opening end of the slit 42 of the extrusion coating head 40. The excess coating liquid is covered with the cleaning liquid, and the excess coating liquid is removed with or without separating the support bodies 4. In this case, the extrusion coating head 40 and the cleaning head 45 may be arranged so as to be separated from each other by a predetermined distance.

Examples of the support that can be used in the coating apparatus of the present invention include a plastic film such as a polyethylene terephthalate film, a long flexible support made of paper or metal foil, and the like. There is no limit. Further, the support may have various treatment layers formed in advance.

The coating liquid that can be used in the coating apparatus of the present invention is not particularly limited as long as it is a coating liquid suitable for coating by an extrusion coating head. The extrusion coating method has excellent controllability of the thickness of the coating film, and is used in applications where a more stable coating film thickness is required than in the past. One of such applications is the formation of a magnetic recording layer or a backcoat layer of a magnetic recording medium, and a magnetic coating solution containing magnetic powder, a binder and a solvent, or a coating solution for a backcoat is used in the present invention. It is one of the coating liquids that can be used.

An example of the magnetic coating liquid will be given below. As the magnetic powder, γ-Fe ₂ O ₃ and Co-containing γ-Fe ₂ O are used.
₃ , Fe ₃ O ₄ , Co-containing Fe ₃ O ₄ , CrO ₂ , barium ferrite, strontium ferrite and other oxide fine powders, metals such as Fe, Co and Ni, or their alloy fine powders, iron carbide, etc. It can be used. Also,
As the binder, any of various known resin binders can be used. Further, the solvent is not particularly limited and, for example, various solvents such as cyclohexanone, methyl ethyl ketone, methyl isobutyl ketone, and other ketone solvents, and toluene and other aromatic solvents can be appropriately selected according to the purpose.
Further, the magnetic coating liquid may contain various additives such as inorganic fine particles and a lubricant, if necessary. The magnetic recording layer formed using the above magnetic coating solution has a dry film thickness of about 0.1 to 6 μm, and the magnetic recording layer has a thickness of 30 to 9 μm.
It is preferable that the magnetic powder occupies 2% by weight. Further, as in recent years, the coating liquid may be multilayered in a wet state to provide a coating layer. In this case, the coating liquid is not limited to the magnetic liquid, and any non-magnetic liquid, a resin dissolution liquid, or the like can be applied as long as it is a coating liquid suitable for coating by the extrusion type coating head as described above. The layer structure can also be selected as necessary. Examples of back coating liquids include carbon black, α-Fe ₂ O ₃ , TiO ₂ , CaO, and SiO as pigments.
₂ , Cr ₂ O ₃ , α-Al ₂ O ₃ , SiC, CaCO
₃ , BaSO ₄ , ZnO, MgO, boron nitride, TiC
Any of non-magnetic inorganic powders such as the above can be used. Also,
As the binder, any of various known resin binders can be used. Further, the solvent is not particularly limited and, for example, various solvents such as cyclohexanone, methyl ethyl ketone, methyl isobutyl ketone, and other ketone solvents, and toluene and other aromatic solvents can be appropriately selected according to the purpose.
Further, the backcoat coating liquid may contain various additives such as inorganic fine particles and a lubricant, if necessary. The backcoat layer formed by using the above coating solution for backcoat has a dry film thickness of about 0.1 to 1.0 μm, and the pigment occupies 30 to 80% by weight of the backcoat layer. This is preferable.

The cleaning solution used in the present invention includes ketone systems such as cyclohexanone, methyl ethyl ketone and methyl isobutyl ketone, and aromatic systems such as toluene. These may be used alone or in admixture of two or more. . Specific examples thereof include methyl ethyl ketone, a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone, cyclohexanone, a mixed solvent of cyclohexanone and methyl ethyl ketone, toluene, a mixed solvent of toluene and methyl ethyl ketone, and the like.

[0036]

EXAMPLES The present invention will be described in more detail with reference to examples.

As a support, the width is 1,000 mm and the thickness is 15
A polyethylene terephthalate film having a thickness of μm was prepared. Further, raw materials (1) to (10) having the following compositions were kneaded, dispersed, and filtered, and (11) was further added and mixed therein to obtain a magnetic coating liquid. (Composition of magnetic coating liquid) (1) Co-containing γ-Fe ₂ O ₃ 100 parts by weight (Hc = 750 Oe, specific surface area (BET) = 43 m ² / g) (2) Alumina powder 5 parts by weight (3) Vinyl chloride -Vinyl acetate-vinyl alcohol copolymer (degree of polymerization = 310, composition ratio = 88: 6: 6) 10 parts by weight (4) polyester polyurethane resin 10 parts by weight (5) carbon black 5 parts by weight (6) stearic acid 2 Parts by weight (7) Butyl stearate 1 part by weight (8) Methyl ethyl ketone 100 parts by weight (9) Toluene 100 parts by weight (10) Cyclohexanone 80 parts by weight (11) Polyisocyanate 4 parts by weight Example 1 Example 1 As shown in FIGS. Using the coating device 1 and the extrusion coating head 2 described above, the above-mentioned magnetic coating liquid was discharged from the slit 17 for supplying the coating liquid, and coating was performed on the surface of the support 4 which was transported at a transportation speed of 300 m / min. After coating, the support 4 was dried by the drying device 3 to form a magnetic recording layer (dry thickness 3 μm), and then wound on a winding roll 6.

In the present embodiment, in the above-mentioned coating step, after 30 minutes from the start of coating, the cleaning liquid (methyl ethyl ketone) is supplied with the cleaning liquid at the time when the joint (seam) of the support 4 passes through the extrusion coating head 2. Was discharged for 3 seconds at a discharge pressure of 0.5 kg / cm ² . At the same time, the extrusion coating head 2 and the support 4 are separated by about 20 cm,
While the cleaning liquid was being discharged, the tip of the extrusion coating head 2 was lightly rubbed with a brush to wash away the cleaning liquid. Then, only the discharge of the cleaning liquid was stopped and the coating of the coating liquid on the support 4 was continued.

The thus coated material was wound on the winding roll 6 as described above, and the joint portion (joint portion) of the support was discarded to obtain a raw roll. The state of the coating film surface of this raw fabric roll was visually observed and evaluated by the following evaluation methods. The results are shown in Table 1.

Example 2 In Example 1, the tip of the extrusion coating head 2 (the tip of the extrusion coating head 2 was rotated by swinging the extrusion coating head 2 back and forth without keeping the space between the extrusion coating head 2 and the support 4). Application and coating were performed in the same manner as in Example 1 except that the excess coating liquid adhering to the upper surface) was removed along with the cleaning liquid and removed.
It was washed and the coating film was evaluated. The results are shown in Table 1.

Comparative Example 1 In Example 1, with the space between the extrusion coating head 2 and the support 4, the cleaning liquid was discharged about 3 times without being discharged.
The state of the coating film surface after continuously applying the coating liquid for 0 minutes was visually observed and evaluated by the following evaluation methods. The results are shown in Table 1.

Comparative Example 2 In Example 2, the coating was performed after the extrusion coating head 2 and the support 4 were not separated from each other, and the coating liquid was continuously applied for about 30 minutes without discharging the cleaning liquid. The state of the film surface was visually observed and evaluated by the following evaluation methods. The results are shown in Table 1.

(Evaluation of uniformity of coating film) [Coating unevenness] ⊚: No coating unevenness on a good surface ◯: Some coating unevenness, but production was possible ×: Many coating unevenness and non-uniformity A coating film surface was formed [Coating streak defect] ◯: There were few streaks on the coating film surface ×: Many streaks were observed on the coating film surface

[0044]

[Table 1] As is clear from Table 1, in the examples 1 and 2, the cleaning liquid was discharged in parallel at the same time as the coating liquid was discharged.
Comparative Example 1 in which a uniform coating film was obtained without causing defective coating streaks, but the coating was continued without discharging the cleaning liquid,
In No. 2, coating unevenness and coating streak defects were observed.

[0045]

As described in detail above, according to the present invention,
Using an extrusion coating head provided with a cleaning liquid supply means on the upstream side of the coating liquid supply slit of the extrusion coating head in the support conveying direction, the coating liquid is continuously discharged from the coating liquid supply slit of the extrusion coating head. Since the coating solution is applied to the surface of the running support and the cleaning solution is discharged from the cleaning solution supply unit at predetermined time intervals to clean the coating solution discharge surface of the extrusion coating head, the supply of the coating solution is stopped. It is possible to wash the tip of the coating head of the coating device in parallel with the coating on the support without the need to prevent film thickness fluctuations, coating unevenness, coating streaks, etc. The effect that it is possible to form a different coating film is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a coating apparatus of the present invention.

FIG. 2 is an external perspective view showing an example of an extrusion coating head that constitutes the coating apparatus of the present invention.

3 is a cross-sectional view of the extrusion coating head shown in FIG.

FIG. 4 is a cross-sectional view showing another example of an extrusion coating head that constitutes the coating apparatus of the present invention.

FIG. 5 is an explanatory view showing another example of an extrusion coating head which constitutes the coating apparatus of the present invention.

FIG. 6 is an explanatory diagram showing another example of an extrusion coating head that constitutes the coating apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Extrusion coating device 2,20,30,40 ... Extrusion coating head 3 ... Drying device 4 ... Support body 5 ... Feeding roll 6 ... Winding roll 10,21 ... Front edge 11,22,23 ... Center edge 12,24 Back edge 14, 25, 46 Cleaning liquid pocket (cleaning liquid supply means) 15, 26, 47 Cleaning liquid supply slit (cleaning liquid supply means) 16, 27, 29, 31, 41 ... Coating liquid pocket 17, 28, 30, 32, 42 ... Slits for coating liquid supply 33 ... Jet nozzle (cleaning liquid supply means) 45 ... Cleaning head (cleaning liquid supply means)

Front page continuation (72) Inventor Yoshihisa Osawa, 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Akira Hatakeyama 1-1-13-1, Nihonbashi, Chuo-ku, Tokyo TDK Corporation Within

Claims (6)

[Claims] 1. A coating device comprising an extrusion coating head for continuously discharging a coating liquid from a coating liquid supply slit to coat the surface of a support, wherein a support of the coating liquid supply slit of the extrusion coating head. An application device, wherein a cleaning liquid supply means is provided on the upstream side in the transport direction. 2. The coating device according to claim 1, wherein the coating liquid is continuously discharged from a coating liquid supply slit of the extrusion coating head to coat the surface of a running support, and the cleaning liquid supply means. Is discharged at a predetermined time interval from the above to wash the tip of the extrusion coating head. 3. The coating / applying apparatus according to claim 2, wherein the cleaning liquid is discharged from the cleaning liquid supply means when the joint portion of the support passes through the extrusion coating head.
Cleaning method. 4. The coating / cleaning according to claim 2, wherein the cleaning liquid is ejected from the cleaning liquid supply means with a space between the support and the extrusion coating head. Method. 5. The cleaning liquid is discharged from the cleaning liquid supply means without separating the support and the extrusion coating head from each other.
The coating and cleaning method described in. 6. The coating / cleaning method according to claim 2, wherein the cleaning liquid is discharged from the cleaning liquid supply means over the entire width of the coating head.