JP2887705B2 - Coating amount control device based on paint color in microgravure coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an apparatus for applying a coating material to the surface of a strip using a microgravure coating apparatus, for example, an improvement in an application apparatus for applying a concealing layer on a magnetic recording medium. The present invention relates to an improvement in a device for controlling the amount of coating applied to the surface of the band-like material using a microgravure coating device.

[0002]

2. Description of the Related Art A silver concealing layer or a white concealing layer is provided on the surface of a base material of a regular ticket, a prepaid card, a visual card or the like. Conventionally, these silver concealing layers, white concealing layers, etc., are coated with an optical measuring device attached to a coating device off-line to measure the optical characteristics and obtain stable coating conditions based on the measurement data. The amount was adjusted.

[0003] This will be described in more detail with reference to FIG. 3. The strip 2 wound around an unwinder 1 is guided by a backing roll 3, enters a drying device 4, is dried, and is wound up by a winder 5. An applicator roll 6 to which a paint is attached is provided facing the backing roll 3, and the applicator roll 6 applies a paint for forming a silver concealing layer, a white concealing layer, and the like to the strip 2. In the above-described conventional coating apparatus, the coating apparatus is once operated to apply the coating material to the band 2 wound around the unwinder 1, and the coating is dried by the drying apparatus 4 to be dried.
The color of the product wound up by the winder 5 is measured off-line by colorimetry. Then, it is determined whether the amount of paint applied is large or small by colorimetric measurement, and based on the result, the amount of paint applied is adjusted, and the next unwinder 1 uses the adjusted amount of paint to apply the paint. Make sure the device is activated.

On the other hand, there are various methods for adjusting the amount of paint applied to the belt-like material 2, and a representative one is a gap adjustment method and a rotation speed adjustment method. The gap adjusting method is the method shown in FIG. 3 described above, in which the metering roll 7 is installed to face the applicator roll 6 with a gap (H), and the metering roll 7 approaches and separates from the applicator roll 6. The gap (H) is adjusted freely. The gap (H) determines the film thickness of the paint adhering to the surface of the applicator roll 6. The larger the gap (H), the larger the film thickness, and the smaller the gap (H), the smaller the film thickness. Become. The applicator roll 6 adheres paint to the surface of the applicator roll 6 and transfers the paint to the strip 2. The metering roll 7 adjusts the gap (H) and adheres to the surface of the applicator roll 6. The thickness of the paint is increased or decreased, and the amount of the paint transferred to the belt-shaped material 2 is measured. The rotation speed adjusting method is found in a known microgravure coating apparatus, and changes the rotation speed of a microgravure roll that supplies a coating material to a belt-like material to increase or decrease the coating amount.

[0005] The above-described conventionally known off-line colorimetric measurement method after the completion of coating has the following problems. That is, there is a problem in quality control of a product in colorimetric measurement for each roll. In addition, the colorimetric measurement for each roll causes a problem in product production efficiency. Therefore, in order to improve the disadvantage of the off-line colorimetric measurement method, an in-line colorimetric measurement method as described below has been proposed. (JP-A-63-7870 and JP-A-3-178357) Here, the in-line colorimetric measurement method means that colorimetry is performed while applying a paint with a coating apparatus, and the amount of coating is adjusted. Things.

Referring to FIG. 1, a strip 12 wound around an unwinder 11 is a paint coating device (a backing roll 13, an applicator roll 14, a metering roll 15, a pickup roll 15A, and a paint supply device 16). A paint such as a paint ink is applied by a roll coater device and introduced into the drying device 17. The drying device 1
The strip 12 dried in 7 is wound up by a winder 18 to form a product.

[0007] The applicator roll 14 is used for the paint supply device 1.
A paint supply roll is provided on the surface of the coating material 6 to transfer the paint to the belt 12. The applicator roll 14 is installed to face the backing roll 13. The applicator roll 14 forms a coating film on the surface of the strip 12. The metering roll 15 is a roll for measuring the amount of paint applied, and has a slight gap (H) between the metering roll 15 and the applicator roll 14.
The gap is increased or decreased by moving the metering roll 15 to adjust the film thickness of the paint adhering to the applicator roll 14 and transferred from the applicator roll 14 to the strip 12. The coating amount is increased or decreased (coating measurement). The pickup roll 15A is provided as needed, and the paint picked up by the pickup roll 15A is transferred to the applicator roll 14.

At a position immediately before the belt 12 exits the drying device 17 and is wound up by the winder 18, a colorimeter 19 for measuring the color of the applied paint is provided. The color signal 20 measured by the colorimeter 19 is sent to the controller 21. The controller 21 compares the value of the measured color tone signal 20 with a set value and outputs a signal 22 for increasing or decreasing the coating amount. The output signal 22 is input to a coating amount increasing / decreasing device 23. The application amount increasing / decreasing device 23 increases or decreases the application amount when the coating material is applied to the belt-shaped material 12 by the applicator roll 14. In this embodiment, a gap (H) between the applicator roll 14 and the metering roll 15 is used. ) (The above-mentioned Japanese Patent Application Laid-Open No. 63-7870).
The applicator roll 14 and the metering roll 15
A method for controlling the increase / decrease of the coating amount by changing the number of rotations is also known (Japanese Patent Application Laid-Open No. 3-178357).

The operation will be described below. When the coating apparatus is operating, the band 1 is constantly measured by the colorimeter 19.
The color of the paint applied to 2 is measured, and a signal 20 of the color is given to the controller 21. Controller 21
Is compared with the set value and an output signal 22 of the difference is output. The output signal 22 activates the coating amount increasing / decreasing device 23 and the metering roll 1
5, the gap (H) between the applicator roll 14 and the metering roll 15 is adjusted, and
2. Increase or decrease the amount of the paint applied to 2. Incidentally, in the case of the rotation speed control system, the output signal 22
Is operated to adjust the number of revolutions of the metering roll 15, the pickup roll 15A and the applicator roll 14, thereby increasing or decreasing the amount of paint applied to the strip 12.

[0010]

However, a plurality of rolls known in the prior art as described above, that is, an applicator roll 1
4 metering roll 15, pickup roll 15A
In the method of performing in-line colorimetric measurement with a roll coater coating apparatus using a method such as described above, there are the following problems. That is,
Since a plurality of rolls are used, it is difficult to precisely adjust the gap and the number of rotations. In addition, in the method of adjusting the gap, the adjusting device becomes complicated and expensive.

Accordingly, an object of the present invention is to improve the drawbacks of the conventionally known in-line type coating amount adjusting device,
Focusing on the fact that the microgravure roll type coating device has only one microgravure roll, the use of this microgravure type coating device simplifies the adjusting device and reduces cost. Where you do it.

[0012]

The features of the present invention reside in the following configuration. It has a strip to which paint ink or the like is applied, a coating device for continuously applying the paint ink or the like to the strip, and a winder for winding the strip to which the paint ink or the like is applied by the coating device. A colorimeter that measures the color of the applied paint,
A controller for outputting a signal for increasing / decreasing a coating amount by comparing a signal of a hue measured by the colorimeter with a set value, and a coating amount increasing / decreasing device for increasing / decreasing an application amount in a coating apparatus according to an output signal of the controller In the coating amount control device based on the color of the paint in a coating device provided with a coating device, a coating device for continuously applying a paint ink or the like to the belt-like material is installed to face the belt-like material, and the coating material is applied to the belt-like material. A micro gravure coating apparatus comprising one micro gravure roll for continuously applying ink and the like and a paint supply device for supplying a coating to the micro gravure roll. The device must increase or decrease the number of rotations of the microgravure roll.

Further, the present invention is characterized in that the color of the applied paint is a color difference value of the paint or a color value of the paint.

[0014]

The colorimeter of the paint applied to the strip is measured by a colorimeter, the signal of the measured color is compared with a set value by a controller, and the application amount increasing / decreasing device is operated by the difference signal. The number of rotations of the microgravure roll is adjusted to increase or decrease the amount of application in the coating apparatus.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a schematic view showing a coating apparatus using a microgravure roll according to one embodiment of the present invention.

In a microgravure coating apparatus in which the strip 12 is guided by a turn roll 24 and introduced into a drying device (not shown), a microgravure roll 25 is installed so as to face the strip 12, and the microgravure roll 25 is provided. An application amount increasing / decreasing device 23 for adjusting the application amount by increasing / decreasing the number of rotations of 25 is provided. The rotation control of the application amount increasing / decreasing device 23 is the same as the control system shown in FIG. Here, the microgravure roll 25 is a roll that measures the amount of the paint applied to the belt-like material 12 by increasing or decreasing the number of revolutions, and the paint is supplied to the surface by the paint supply device 16 and the attached paint is applied. Is transferred to the band-shaped material 12.

A strip 12 wound around an unwinder 11, a paint supply device 16, a drying device 17,
8. The colorimeter 19 for measuring the color of the paint applied, the signal 20, the controller 21 and the output signal 22 of the color measured by the colorimeter 19 are the same as those shown in FIG. I do.

In the present invention, the strip 12 is a coated paper,
It is a general term for a band-like material such as a coating film, a sheet-like material or a web which is continuously conveyed. Further, the colorimeter 19 is composed of a spectrophotometer and the like, and various types of spectrophotometers are known, and the description thereof will be omitted.

[0019]

The effects of the present invention configured as described above are as follows. According to the present invention,
Since the number of rolls is only one microgravure roll, adjustment of the number of rotations is easy, precise adjustment is possible, and the cost is low.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventionally known in-line type coating amount control device.

FIG. 2 is a schematic diagram showing a coating amount control device using a gravure roll coating device according to one embodiment of the present invention.

FIG. 3 is a schematic view showing a conventionally known off-line type coating apparatus.

[Explanation of symbols]

 Reference Signs List 12 strip 16 paint supply device 19 colorimeter 20 signal 21 controller 22 output signal 23 coating amount increasing / decreasing device 24 turn roll 25 microgravure roll

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takahiro Mori 3-1 Yosoba Tomoecho, Shizuoka City, Shizuoka Prefecture Inside the Technical Research Laboratory of Hamikawa Paper Mill Co., Ltd. No. 3-1 Inside the Technical Research Laboratory of Hamakawa Paper Mill Co., Ltd. (56) References JP-A-63-7780 (JP, A) JP-A-3-178357 (JP, A)

Claims (3)

(57) [Claims] 1. A band to which a coating ink or the like is applied, and the band
A coating apparatus for continuously applying a coating ink or the like Jo was a strip of coating ink and the like has been applied by the <br/> coater winding
A coating device having a winder to wipe off
A colorimeter for measuring the color of the applied paint, and the colorimeter.
Compare the tint signal measured by the
A controller that outputs a signal to increase or decrease the application amount
The output signal of the controller causes the coating in the coating device
Coating device provided with a coating amount increasing / decreasing device for increasing / decreasing a cloth amount
A coating amount control device based on the color of the paint in the coating device, wherein the coating material is continuously applied to the belt-like material.
Is installed facing the strip, and paint ink etc. is applied to the strip.
One microgravure roll for continuously applying
Paint supply device for supplying paint to the microgravure roll
It is a micro gravure coating device consisting of
An application amount increasing / decreasing device for increasing / decreasing the application amount is provided with a micro
The increase or decrease in the number of rotations of the via roll
A coating amount control device based on the color of the paint in the gravure coating device. 2. The microgravure according to claim 1, wherein the color of the applied paint is a color difference value of the paint.
(A) A coating amount control device based on the color of the paint in the coating device. 3. A microgravure according to claim 1, wherein the color of the applied paint is a color value of the paint.
(A) A coating amount control device based on the color of the paint in the coating device.