JPH0663486A - Method and head for stripe-like coating - Google Patents

Abstract

PURPOSE:To make it possible to coat different types of coating liquid in a given quantity on the same plane in stripes simultaneously using a single coating work with a slide coater. CONSTITUTION:The coating head 10 has slits 1a to 4a arranged at a certain interval in a direction crossing almost at right angles with a direction where a surface to be coated extends. It is possible to coat in stripes simultaneously on the same surface by extruding coating liquids of any different types 8a to 8d in a given quantity from each slit 1a to 4a separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and a head therefor, and more particularly to a method and apparatus for simultaneously coating a plurality of different types of coating solutions on the same plane in arbitrary stripes. .

[0002]

2. Description of the Related Art Conventionally, in order to coat in stripes,
For example, in the case of applying by gravure coating, the gravure plate may be formed in a stripe shape, and in the die coating, it can be performed by adding wedges, for example, as in a color sample whose color density gradually changes. In order to apply different types of coating liquid in parallel on the same plane in stripes, it is necessary to prepare plates for the number of different types of coating liquid for gravure coating, and repeat coating. When obtaining stripes with different man-hours, it was necessary to prepare a plate for each quantity and repeatedly coat it.

By the way, conventionally, a slide coater, a curtain coater, and a slot coater have been known as a device for uniformly coating the entire surface to be coated in a single layer or a multilayer. The outline of each device is shown in FIGS. Figure 1 is a slide coater, Figure 2 is a curtain coater, and Figure 3
FIG. 3 is a side view of the slot coater. Briefly explaining each device, the coating head 10 of each device,
A plurality of slits 11 to 14 for pushing out the coating liquid for the multilayer film to be applied are provided in parallel in 10 'and 10 ", and the tip of the head 10, 10' or 10" is applied to the film 15 to be applied. The slide coater shown in FIG. 1 and the curtain coater shown in FIG. 2 have a shape and arrangement as shown in each figure. It is suitable for coating, and in the former, the nozzle is arranged close to the film to be coated 14 at a distance of 1 mm or less, whereas in the latter, the nozzle can be arranged several mm apart. The slot coater shown in FIG. 3 is one in which the lower layer is coated on the film 15 to be coated in order, and is suitable for coating a high-viscosity liquid. In the case of a slide coater or a curtain coater, the slits 11 to 1 are used to control the thickness of the coating film.
The amount of liquid extruded from 3 and the speed control of the coated film 15 are used. In the case of a slot coater, the distance between the coated film 15 and the head 10 ″ is adjusted and the speed of the coated film 15 is controlled. To do.

[0004]

As described above, in order to coat different kinds of coating liquids in the same plane in a plurality of stripes at the same time in arbitrary amounts, conventionally, gravure coating must be used. In order to do so, it was necessary to prepare a large number of plates and repeatedly coat them. Further, conventionally, a slide coater, a curtain coater, and a slot coater, which can extrude a coating liquid from a slit and apply it uniformly, have not been applied to coat a plurality of stripes.

The present invention has been made in view of such a situation, and an object thereof is to use a slide coater, a curtain coater or a slot coater to perform different coatings on the same plane in a single coating operation. It is an object of the present invention to provide a method for simultaneously coating an arbitrary amount of a coating liquid into a plurality of stripes and a coating head therefor.

[0006]

The striped coating method of the present invention which achieves the above object uses a slit arranged so as to be substantially orthogonal to the traveling direction of the surface to be coated, and the coating liquid is applied from the slit. In the coating method of coating the surface to be coated by extruding,
Arranging a plurality of slits at intervals in a direction substantially orthogonal to the traveling direction of the surface to be coated, and separately supplying an arbitrary amount and arbitrary type of coating liquid from each slit to supply to the surface to be coated. The method is characterized by simultaneously coating a plurality of stripes on the same surface.

In this case, a plurality of slits are arranged in the advancing direction of the surface to be coated, and similarly, the coating liquids of arbitrary amounts and types are separately pushed out from the respective slits and supplied to the surface to be coated. You can also

As a specific coating method, any of slide coating, curtain coating and slot coating can be applied.

The present invention also includes a coating head used in such a stripe coating method.

[0010]

In the present invention, a plurality of slits are arranged at intervals in a direction substantially orthogonal to the traveling direction of the surface to be coated,
Since the coating liquid of any amount and any type is separately pushed out from each slit and supplied to the surface to be coated, a plurality of stripes of different types and film thicknesses can be formed at any width and at any interval.
It is possible to simultaneously coat on the same surface by one coating operation.

[0011]

EXAMPLES Examples of the stripe coating method of the present invention and a coating head therefor will be described below. First, an example of the coating head will be described. According to the present invention, in the slide coater of FIG. 1 and the curtain coater of FIG. 2, the structure of the coating head can be configured to be almost the same, so the slide coater will be described as an example. FIG. 4 is a perspective view (a) and a front view (b) of the head 10 of the slide coater.
In the case of this example, 0 is closely attached to the four slit blocks 1 to 4 and the partition blocks 5a to 5c sandwiched between them to determine the intervals between the slits, the end blocks 6a and 6b, and the back block 7. It is assembled by being integrated. The slit block 1 is provided with slit openings 1a to 1c parallel to the upper surface thereof, and the slit opening 1a constitutes a slit by combining the front surface of the back block 7, the side surface of the end block 6a, and the side surface of the partition block 5a. The slit openings 1b and 1c are configured as cutout portions,
Both ends open to both sides of the block, and the end block 6
It is formed in a groove shape that forms a slit by combining a and the side surface of the partition block 5a. Each slit opening 1a ~
1c has a pipe (not shown) on its bottom surface.
As described above, they are communicated with each other via a liquid reservoir as needed. The other slit blocks 2 to 4 are similarly configured. Partition blocks 5a-5c, end blocks 6a, 6
b and the height of the back block 7 are slit blocks 1 to 4
It is composed somewhat higher than.

Therefore, the end block 6a, the slit block 1, the partition block 5a, the slit block 2, the partition block 5b, the slit block 3, the partition block 5c, the slit block 4, and the end block 6b are adhered in this order from one side surface side. Then, the back surface block 7 is brought into close contact with the back surface thereof, and these are integrated so that a plurality of (in this case, four) slits 1a, 2a, 3a, 4a are formed in the advancing direction of the coated film 15 (FIG. 1). Blocks arranged at intervals in a direction perpendicular to the
A coating head 10 for a slide coater is completed in which the amount and type of the coating liquid extruded through a, 2a, 3a, and 4a can be arbitrarily set independently of each other. Moreover, in the case of this head 10, a plurality of slits 1a having the same length are formed in the direction in which the film 15 to be coated advances.
1c, 2a to 2c, 3a to 3c, and 4a to 4c are arranged.

When such coating head 10 is used to supply a different amount of coating liquid to each slit, the amount of coating liquid applied to each slit is as shown in the front view of FIG. 4B. Groups 1a-1c, 2a-2c, 3a
Stripe-shaped multilayer flows 8a to 8d are formed and flow out at the channel outlets formed by 3c to 4a to 4c. Each flow is separated by the upper ends of the partition blocks 5a-5c. Therefore, this head 10 is
As shown in the side view of FIG. 1, the slits 1a to 1 are arranged on the film to be coated 15 when the film is arranged to face the film to be coated 15 and the coating liquid is continuously supplied to each slit.
c, 2a to 2c, 3a to 3c, and 4a to 4c, the stripe-shaped multi-layer coating is performed with a width determined by the length and intervals determined by the thickness of the partition blocks 5a to 5c.

As described above, the widths of the stripes to be applied are the slits 1a to 1c, 2a to 2c, 3a to 3c, 4 and 4.
Since it is determined by the lengths a to 4c, the thickness of each slit block 1 to 4 may be adjusted to the desired slit width when the head 10 is constructed. Further, since the intervals between the applied stripes are determined by the thickness of the partition blocks 5a to 5c, the thickness of each partition block 5a to 5c may be adjusted to a desired interval when the head 10 is configured. When the coating of each stripe is a single layer, a single slit may be arranged in the traveling direction of the coated film 15.

In the present invention, a plurality of slits are provided in the advancing direction of the surface to be coated and in the direction perpendicular thereto, and the extrusion amount and type of the coating liquid extruded through the slits can be set independently of each other. Although the coating head of (1) is configured by combining a plurality of blocks, it may be configured integrally or by dividing it into blocks different from the above and combining them.

The above is an example of a coating head for a slide coater and a curtain coater.
The slot coater of FIG. 3 is essentially similar to the case of FIG. 4, but uses a head 10 ″ as shown in the perspective view of FIG. 5, for example. 4 and the partition blocks 5a to 5c sandwiched between them to determine the interval between the slits, the end blocks 6a and 6b, and the back blocks 7a and 7b are assembled in close contact with each other.
Is provided with slit openings 1a to 1c parallel to the upper and lower surfaces thereof, and the slit openings 1a and 1c define the front surface of the back block 7a or the back surface of the back block 7b, the side surface of the end block 6a, and the side surface of the partition block 5a. The slit opening 1b is formed as a notch portion that is combined to form a slit, and both ends of the slit opening 1b are open to both side surfaces of the block, and the slit opening 1b is formed in a groove shape that forms a slit by combining with the end block 6a and the side surface of the partition block 5a. Has been done. A pipe (not shown) is connected to each of the slit openings 1a to 1c at the bottom surface thereof via a liquid reservoir if necessary. The other slit blocks 2 to 4 are similarly configured. Partition blocks 5a-5c, end blocks 6a, 6b
In this case, the heights of the rear blocks 7a and 7b are the same as those of the slit blocks 1 to 4. Then, the plurality of slits 1a, 2a, 3a, 4a are formed by bringing the slits 1a, 2a, 3a, 4a into close contact with each other as shown in FIG.
5 (FIG. 3) are blocks arranged at intervals in a direction perpendicular to the traveling direction of each slit 1a, 2a, 3
A coating head 10 "for a slot coater is completed in which the amount and type of the coating liquid extruded through a and 4a can be set independently of each other. In the case of this head 10" as well, the direction of travel of the film 15 to be coated is completed. Direction, a plurality of slits 1a to 1c, 2a to 1c having the same length, respectively.
2c, 3a to 3c, and 4a to 4c are arranged. The operation and the modification are the same as those in the case of FIG.

Now, a description will be given of an embodiment in which the coating head having such a structure is used for coating in stripes. Example 1 Using the slide coater of FIG. 1 and using a coating head as shown in FIG. 4, the number of stripes was set to 10, the width of each stripe was 2 cm, and the interval between them was 0.5 cm. The thickness of the slit block and the partition block was set. The number of slits in the traveling direction of the coated web was set to 1, and each stripe was coated in a single layer. As a coating liquid, a polyvinyl alcohol (PVA) 5% aqueous solution containing 0.2% of a cyan dye based on the solid content was added to each of 30,
60, 90, 120, 150, 180, 210, 24
The amount of 0, 270, and 300 ml / min is supplied to each slit, the web speed is set to 10 m / min, a triacetyl cellulose film is used as a coated web, and 10 stripes are coated thereon and dried. As a result, 10-level gradation stripes having different film thicknesses could be obtained.

Example 2 Using the same slide coater and coating head as in Example 1, 0.05%, 0.1, 0.15, and 0.05% of cyan dye was added to 5% aqueous solution of gelatin based on the solid content, respectively.
0.2, 0.25, 0.3, 0.35, 0.4, 0.4
10 kinds of 5% and 0.5% were prepared and supplied to each slit at 150 ml / min, and the web speed was 10%.
m / min, using a triacetyl cellulose film as the coated web, coating 10 stripes on it, and drying it to obtain a 10-step gradation stripe with a uniform film thickness. It was

Example 3 In this case, the number of slits in the advancing direction of the coated web was set to 2 in the same lateral dimension as in Example 1,
It was decided to apply each stripe in two layers. The solution of Example 2 was used as the lower layer coating solution, and the upper layer coating solution was
Fluorosurfactant Florard F in 1% PVA aqueous solution
C-95 (manufactured by 3M Co.) was added to the solid content in an amount of 0.05%, the lower layer and the upper layer were supplied at 150 ml / min, the web speed was set to 10 m / min, and triacetyl was used as a coated web. Using a cellulose film, coat 10 stripes on it, and dry it to obtain a uniform film thickness protected by PVA.
It was possible to obtain a gradation stripe of 0 steps.

Example 4 Using the slot coater of FIG. 3 and using the coating head as shown in FIG. 5, the number of stripes was set to 3, and the width of each stripe was 10 cm and the spacing between them was 1 cm. The thicknesses of the slit block and the partition block were set. The number of slits in the traveling direction of the coated web was set to 2, and each stripe was coated in two layers. As the lower layer coating liquid, 0.5% each of yellow, magenta, and cyan dyes were added to urethane acrylate oligomer, and as the upper layer coating liquid, a 1: 1 solution of urethane acrylate / dipentaerythritol hexaacrylate was used. Using a web speed of 10 m / min and a lower layer coating solution of 50 ml / min.
min, the coating liquid for the upper layer is supplied at a rate of 30 ml / min, and polyethylene terephthalate
A film was coated with 3 stripes thereon, and then an electron beam irradiation device was used to irradiate it with an electron beam of 5 Mrad, whereby a film coated with 3 glossy stripes could be obtained. .

Although the striped coating method of the present invention and the coating head for the same have been described above with reference to some embodiments, the present invention is not limited to these embodiments and various modifications can be made.

[0022]

As is apparent from the above description, according to the striped coating method and the coating head therefor of the present invention, a plurality of slits are arranged at intervals in a direction substantially orthogonal to the traveling direction of the surface to be coated. Then, since each coating liquid is extruded separately from each slit in an arbitrary amount and supplied to the surface to be coated, a plurality of stripes having different widths, arbitrary intervals, different types, and film thicknesses can be obtained. It is possible to simultaneously coat on the same surface by one coating operation.

[Brief description of drawings]

FIG. 1 is a side view of a slide coater for carrying out the stripe coating method of the present invention.

FIG. 2 is a side view of a curtain coater for carrying out the stripe coating method of the present invention.

FIG. 3 is a side view of a slot coater for carrying out the stripe coating method of the present invention.

FIG. 4 is a diagram for explaining the configuration and operation of one embodiment of the coating head used in the coater of FIGS. 1 and 2.

5 is a perspective view of an embodiment of a coating head used in the coater of FIG.

[Explanation of symbols]

1-4 ... Slit block 1a-1c, 2a-2c, 3a-3c, 4a-4c ... Slit opening 5a-5c ... Partition block 6a, 6b ... End block 7, 7a, 7b ... Back block 10, 10 ', 10 ″ ... Coating head 11-14 ... Slit 15 ... Film to be coated

Claims (10)

[Claims] 1. A coating method for coating a surface to be coated by using a slit arranged so as to be substantially orthogonal to the traveling direction of the surface to be coated, and extruding a coating liquid from the slit to coat the surface to be coated. By arranging a plurality of slits at intervals in a direction substantially orthogonal to the traveling direction, and by separately extruding an arbitrary amount and arbitrary type of coating liquid from each slit and supplying it to the surface to be coated, the same surface can be obtained. A stripe-shaped coating method characterized by coating a plurality of stripes simultaneously on top. 2. A plurality of slits are arranged also in the advancing direction of the surface to be coated, and in the same manner, coating liquids of arbitrary amounts and arbitrary kinds are separately pushed out from the respective slits and supplied to the surface to be coated. The striped coating method according to claim 1, which is characterized in that. 3. The striped coating method according to claim 1, wherein the coating is performed by slide coating. 4. The stripe coating method according to claim 1, wherein the coating is performed by curtain coating. 5. The striped coating method according to claim 1, wherein the coating is performed by slot coating. 6. A coating head having slits relatively orthogonal to the advancing direction of a surface to be coated, wherein a plurality of slits are provided at intervals in a direction substantially orthogonal to the advancing direction of the surface to be coated, and each slit is provided. A coating head characterized in that it can separately supply an arbitrary amount and an arbitrary kind of coating liquid. 7. The invention is characterized in that a plurality of slits are also provided in a traveling direction of a surface to be coated, and similarly, each slit can be separately supplied with an arbitrary amount and an arbitrary type of coating liquid. The coating head according to claim 6. 8. The coating head according to claim 6, which is configured for a slide coater. 9. The coating head according to claim 6, which is configured for a curtain coater. 10. The coating head according to claim 6, which is configured for a slot coater.