JP2011177914A - Photogravure plate cylinder cleaning apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photogravure plate cylinder cleaning apparatus and method that can simply and efficiently remove solid contents in coating solution that are stuck in the cell of a photogravure plate cylinder. <P>SOLUTION: The photogravure plate cylinder cleaning apparatus is used by setting it in a part of a photogravure coating apparatus that is equipped with a coating photogravure plate cylinder in which a cell is formed on the surface. The photogravure plate cylinder cleaning apparatus is characterized in that it at least includes: a cleaning liquid pan which is arranged in the lower part of the photogravure plate cylinder for the purpose of storing a cleaning liquid for use in cleaning, wherein a part of the photogravure plate cylinder is immersed in the cleaning liquid; and a microbubble jetting means which jets microbubbles from the lower part or the side of the photogravure plate cylinder immersed in the cleaning liquid of the cleaning liquid pan and jets the cleaning liquid. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gravure plate cylinder cleaning apparatus and a gravure plate cylinder cleaning method used by setting a part of the gravure coating device having a coating gravure plate cylinder having cells formed on the surface thereof. About.

  Gravure coating using a gravure coating device supplies ink, coating liquid, etc. to the entire surface of the gravure plate cylinder on which the cells are formed, and then the excess coating on the surface of the gravure plate cylinder. After the liquid is scraped off by a doctor, the coating liquid in the cell is transferred to the substrate side by pressing from the impression cylinder. In such a gravure coating, the gravure plate cylinder is generally widely used to supply the coating liquid to the gravure plate cylinder by immersing the gravure plate cylinder in the coating liquid filled in the boat-shaped coating liquid pan. Has been. A coating liquid supply pipe and a coating liquid discharge pipe are connected to the coating liquid pan, and the coating liquid is supplied and stored via a coating liquid storage tank as necessary. ing.

  FIG. 1 shows a schematic configuration of a gravure coating apparatus used for such gravure coating. In the figure, 1 is a gravure plate cylinder, 2 is a doctor, 3 is an impression cylinder, 4 is a coating liquid pan, 5 is a coating liquid, 6 is a base material, 14 is a coating liquid supply pipe, and 15 is a coating liquid discharge. Each tube is shown.

  In order to perform coating using such a gravure coating apparatus, first, the coating liquid 5 is supplied into the coating liquid pan 4, and the lower part of the gravure plate cylinder 1 is immersed in the coating liquid 5. By rotating the gravure plate cylinder 1, the coating liquid 5 is adhered to the entire surface of the gravure plate cylinder 1. A cell 7 is formed on the surface of the gravure plate cylinder 1 as shown in FIG. 2, and the coating liquid 5 is supplied to the entire surface of the gravure plate cylinder including the inside of the cell 7. Then, the excess coating liquid 5 on the surface of the gravure plate cylinder 1 is scraped off by the doctor 2, and then the coating liquid 5 filled in the cell 2 is passed between the impression cylinder 3 and the gravure plate cylinder 1. It transfers to the material 6 and coating is performed.

  In the gravure plate cylinder used for coating, solids such as a pigment, a resin, or a curing agent in the coating liquid are adhered in the cell even after the coating is completed. Accordingly, when cleaning the gravure plate cylinder after completion of coating, it is necessary to remove deposits in the cell using a cleaning liquid such as a solvent and a brush. At this time, if the next coating is performed without completely removing the deposits in the cell, the coating amount of the coating liquid on the substrate changes or the coated surface does not become uniform. In particular, when a coating liquid with a high solid content, a coating liquid that is easy to dry, a coating liquid with a high viscosity, or the like is used, it is essential to carefully clean the gravure plate cylinder.

  However, even if the surface of the gravure plate cylinder is rubbed and cleaned with a hand using a cleaning solution and a brush, if the coating solution is as described above, the deposits such as the remaining coating solution are completely removed from the cell. It is difficult to remove, resulting in uneven cleaning. Also, it is not efficient because it takes time and effort. Further, when the cleaning liquid contains an organic solvent or the like which is not preferable for the human body, even if the person who is cleaning wears a protective mask or gloves, the damage caused by suction or contact with the skin is not a little.

JP-A-5-177177 Japanese Patent Laid-Open No. 6-3224

  On the other hand, Patent Document 1 describes a method of cleaning deposits in a cell of a gravure plate cylinder in a short time. In the cleaning method described in Patent Document 1, the gravure plate cylinder is immersed in a cleaning tank containing a cleaning solution while being rotated, and the surface of the rotating gravure plate cylinder is applied and rubbed while applying ultrasonic vibration. Is the method.

  With such a cleaning method, labor is reduced compared with the cleaning method performed while rubbing the gravure plate cylinder using a cleaning liquid and a brush, and the cleaning is completed in a short time. A device for applying ultrasonic vibration to the cleaning tank and a device for rotating the gravure plate cylinder are required. These devices cannot be used for various gravure plate cylinders unless they are designed to be somewhat large. Accordingly, the cost is increased, and the amount of cleaning liquid used for cleaning increases. Further, when cleaning the gravure plate cylinder, the gravure plate cylinder must be removed from the coating apparatus and moved to the cleaning tank. Depending on the size of the gravure plate cylinder, this type of movement can be significant, requiring time and effort.

  Patent Document 2 describes a method for efficiently cleaning a gravure plate cylinder during coating on a base material. More specifically, the coating liquid is directed from the high-pressure spray device connected to the coating liquid pan to the side of the gravure plate cylinder and downstream from the contact portion with the base material toward the gravure plate cylinder. Is ejected to discharge the deposits in the cells of the gravure plate cylinder.

  In this method, it is possible to remove deposits in the cell without removing the gravure plate cylinder from the coating apparatus and washing it. However, when the coating liquid to be used is a liquid with a high solid content or a liquid with a high viscosity, it is difficult to completely remove the deposits in the cells of the gravure plate cylinder only by spraying the coating liquid. In addition, in order to eject the coating liquid at a pressure sufficient to completely discharge the deposits in the cell using such a coating liquid, it is necessary to prevent the coating liquid from scattering to the surroundings. It is necessary to prepare facilities and a high-intensity ejection device that can withstand pressure. In addition, this method is useful when coating with the same coating liquid continuously, but when the coating is interrupted and replaced with another coating liquid, the gravure plate, etc. It is not suitable if you want to clean the cylinder completely.

  The present invention is to solve the above-mentioned conventional problems, and a gravure capable of removing solids and the like in a coating liquid adhering in a cell of a gravure plate cylinder easily and efficiently. It is an object of the present invention to provide a plate cylinder cleaning apparatus and a gravure plate cylinder cleaning method.

  In order to achieve the above object, the invention according to claim 1 is used by being set in a part of a gravure coating apparatus having a coating gravure plate cylinder having cells formed on the surface thereof. A gravure plate cylinder cleaning device, which is disposed below the gravure plate cylinder, stores a cleaning liquid for use in cleaning, and a cleaning liquid pan for immersing a part of the gravure plate cylinder in the cleaning liquid; A gravure characterized in that it comprises at least microbubble jetting means for jetting microbubbles from the bottom or side of the gravure plate cylinder immersed in the cleaning liquid in the cleaning liquid pan and jetting the cleaning liquid It is a plate cylinder cleaning device.

  The invention according to claim 2 is the gravure plate cylinder cleaning apparatus according to claim 1, wherein the cleaning liquid pan also serves as a coating liquid pan of the gravure coating apparatus, and the coating of the gravure coating apparatus there The cleaning liquid is sequentially supplied using a means for circulating the liquid.

Furthermore, the invention according to claim 3 is the gravure plate cylinder cleaning apparatus according to claim 1 or claim 2, wherein the cleaning liquid is contained in the upper opening of the cleaning liquid pan when the gravure plate cylinder is being cleaned. A scattering prevention lid is provided to prevent the cleaning liquid pan from splashing outside through the upper opening.

  Furthermore, the invention according to claim 4 is the gravure plate cylinder cleaning apparatus according to any one of claims 1 to 3, wherein the fine bubble jetting means is arranged adjacent to the compressed air generator. And a microbubble generating plate provided with a large number of micropores for generating microbubbles.

  Furthermore, in the invention described in claim 5, a cleaning liquid pan is disposed below the gravure plate cylinder of the gravure coating apparatus, and the gravure plate cylinder is rotated while being partially immersed in the cleaning liquid stored therein. At the same time, the cleaning liquid is jetted by continuously ejecting microbubbles from below or from the side of the rotating gravure plate cylinder toward the gravure plate cylinder to remove solids etc. adhering in the cells of the gravure plate cylinder. The gravure plate cylinder cleaning method is characterized by cleaning.

  According to the present invention, when the gravure plate cylinder is washed, it is not necessary to remove the gravure plate cylinder from the gravure coating apparatus, so that the gravure plate cylinder can be efficiently washed without taking time and effort.

  Furthermore, even in a gravure plate cylinder used for coating using a coating liquid with a high solid content or a coating with a high viscosity, micro bubbles are continuously ejected from the micro-bubble ejecting means, and a jet is generated in the cleaning liquid. Therefore, the deposits in the cell of the gravure plate cylinder can be surely removed.

  In addition, since there is no need to clean the gravure plate cylinder with human hands using a cleaning solution and a brush, etc., even if a cleaning solution containing a component that is not preferable for the human body is used, the effect on the human body is extremely reduced. Can be performed.

  Further, in the gravure plate cylinder cleaning apparatus of the present invention, if the cleaning liquid pan has the function of the coating liquid pan of the gravure coating apparatus, the coating liquid is discharged from the coating liquid pan after completion of the coating operation, Since the cleaning liquid can be filled in the coating liquid and cleaning liquid pan as it is and the cleaning operation can be started, the work efficiency is extremely improved.

  Further, in the upper opening portion of the gravure plate cylinder cleaning apparatus of the present invention, when the gravure plate cylinder is being cleaned, the cleaning liquid is prevented from splashing outside from the upper opening portion of the cleaning liquid pan. If the lid is provided, even if microbubbles are continuously ejected toward the gravure plate cylinder rotating in the cleaning liquid, and the cleaning liquid is jetted to perform cleaning, the cleaning liquid will not scatter from the cleaning liquid pan. The surroundings will not be soiled.

It is explanatory drawing which shows the schematic structure of a general gravure coating apparatus. It is explanatory drawing which shows the surface state of a gravure printing cylinder. It is explanatory drawing which shows the general | schematic cross-sectional structure of the gravure printing cylinder washing | cleaning apparatus of this invention in a see-through state. It is explanatory drawing which shows a perspective state of the general | schematic perspective structure of the gravure printing cylinder washing | cleaning apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The gravure plate cylinder cleaning apparatus 20 of the present invention is a part of a gravure coating apparatus having a coating gravure plate cylinder 31 having cells formed on the surface thereof, as shown in FIGS. 3 and 4, for example. The gravure plate cylinder cleaning apparatus is used by being set in the storage unit, and is disposed below the gravure plate cylinder 31 to store a cleaning liquid 32 for use in cleaning, and a part of the gravure plate cylinder 31 is stored in the cleaning liquid 32. A microbubble for continuously ejecting microbubbles from below the gravure plate cylinder 31 immersed in the cleaning liquid pan 33 and the cleaning liquid 32 of the cleaning liquid pan 33 to generate a jet in the cleaning liquid. The ejection means 35 is provided at least.

  In the illustrated gravure plate cylinder cleaning apparatus 20, the microbubble jet means 35 includes a compressed air generator 30 and a microbubble generator plate 38. Compressed air is sent to the compressed air generator 30 through a pipe (not shown) from a compression pump (not shown), and the compressed air is supplied to the microbubble generating plate 38 arranged adjacent thereto. It is like that. The micro-bubble generating plate 38 has a large number of micro-holes for generating micro-bubbles, and the compressed air supplied to the micro-bubble generating plate 38 is replaced with micro-bubbles, which are uniformly and continuously in the cleaning liquid 32. The jet 36 flowing toward the gravure plate cylinder 31 is generated in the cleaning liquid 32.

  As shown in FIGS. 3 and 4, the position where the compressed air generator and the microbubble generator plate are provided may be below the gravure plate cylinder 31, but may be on the side of the cleaning liquid pan. However, in order to evenly eject the microbubbles to the gravure plate cylinder, the compressed air generator and the microbubble generator plate should be respectively arranged at positions below the gravure plate cylinder below the cleaning liquid pan. Is preferred.

  The size of the micro holes 37 formed in the micro bubble generating plate 38 may be any size as long as it causes the cleaning liquid to generate a jet flow by the micro bubbles ejected therefrom, and may be about 0.5 to 5 mm. . Moreover, although the arrangement | sequence space | interval of each micropore 37 may be about 10-50 mm, it is more preferable if it is 10-20 mm. Further, the thickness of the microbubble generating plate 38 is not particularly limited, but it is sufficient that the thickness has a strength that does not cause deformation by the compressed air.

The degree of compression of compressed air sent from a compression pump (not shown) connected to the compressed air generator 30 with a pipe (not shown) may be about 10 × 10 ^{−4 to} 500 × 10 ⁻⁴ Pa, What is necessary is just to set to the optimal thing according to the property of the coating liquid 32 and the washing | cleaning liquid 32 which were used at the time of coating.

  On the other hand, as the constituent material of the cleaning liquid pan 33, the compressed air generator 10 and the micro-bubble generating plate 38, stainless steel, polyester, or the like may be used. However, any material that is not affected by the cleaning liquid 32 may be used. Can be used.

  Further, as the cleaning liquid 32, an appropriate one may be selected from water, alcohol, ketones and the like corresponding to the type of the coating liquid used in the coating.

In addition, as shown in FIGS. 3 and 4, the cleaning liquid 32 scatters to the outside from the upper opening of the cleaning liquid pan 33 at the upper opening of the cleaning liquid pan 33 when the gravure plate cylinder 31 is being cleaned. A lid 39 for preventing scattering may be provided.
The shape and installation position may be determined in consideration of preventing the cleaning liquid 32 from splashing out of the cleaning liquid pan 33 during cleaning. The gravure plate cylinder 31 and the doctor of the gravure coating apparatus and its peripheral components ( There is no particular limitation as long as it is a size and a position not in contact with each other. In addition, as a constituent material of the lid 39, a material that is not affected by the cleaning liquid 32 can be used as appropriate.

The rotation speed when rotating the gravure plate cylinder 31 during the cleaning depends on the diameter of the gravure plate cylinder 31, but may be about 10 to 60 rpm at which the deposits in the cell are efficiently removed by the jet of the cleaning liquid. However, depending on the nature of the coating liquid adhering to the inside of the cell, the cleaning effect may be enhanced by rotating at a rotational speed outside this range.
Examples of the present invention will be described below.

  After filling the coating liquid / cleaning liquid pan of the gravure coating device with the high-viscosity resin-based coating liquid, the remaining coating liquid in the coating liquid / cleaning liquid pan is discharged and left as it is. In the state, the coating liquid and cleaning liquid pan was filled with a cleaning liquid composed of an organic solvent, and the gravure plate cylinder was partly immersed therein while rotating.

  Next, by sending compressed air from the compression pump to the compressed air generator set in the lower part of the coating liquid / cleaning liquid pan through the pipe, the micro bubbles provided adjacent to the compressed air generator Microbubbles were continuously ejected from the microholes of the generating plate into the cleaning liquid, and a jet flow toward the gravure plate cylinder was generated in the cleaning liquid, and the deposits in the cell 7 of the gravure plate cylinder were removed to perform cleaning.

  During cleaning, the pressure of the compressed air and the rotation speed of the gravure plate cylinder were appropriately adjusted while visually confirming the situation where the deposits were removed from the surface of the gravure plate cylinder. By setting the optimum pressure and rotation speed, it was confirmed that the jet of cleaning liquid uniformly collided with the surface of the gravure plate cylinder, and that pressure scraped off the deposits inside the cell and removed them outside the cell. It was.

  At this time, the deposits in the cell were mixed in the cleaning liquid, and the cleaning effect was lowered. Therefore, the cleaning liquid was once discharged out of the apparatus, and a clean cleaning liquid was newly supplied to proceed with the cleaning operation. When the gravure plate cylinder was cleaned in this way, it was found that the plate surface of the gravure plate cylinder was in the same surface state as before the coating liquid adhered, and was surely cleaned.

  As described above, according to the gravure plate cylinder cleaning apparatus and the gravure plate cylinder cleaning method of the present invention, when the gravure plate cylinder is cleaned after the coating operation in the gravure coating apparatus, the gravure plate cylinder is removed from the gravure coating apparatus. Without removing it, simply draining the coating liquid from the cleaning liquid pan that also serves as the coating liquid pan and supplying the cleaning liquid immediately starts the cleaning operation. improves. In addition, since it is not necessary to handle a brush for cleaning, much labor and labor are not required, and even when a cleaning liquid containing a component that is not preferable for the human body is used, adverse effects on the human body can be minimized. Furthermore, even in the case of a gravure plate cylinder used for coating a coating liquid with a high solid content or a coating liquid with a high viscosity, which was difficult to clean completely by hand, the attachment in the cell. It is possible to completely remove the kimono.

  The present invention can be used for cleaning of a gravure plate cylinder in any gravure coating apparatus, but particularly used for coating in a gravure coating apparatus using a coating liquid containing a pigment or a high viscosity coating liquid. It is effective for cleaning the gravure plate cylinder.

1. 31. Gravure plate cylinder 2. Doctor 3. Impression cylinder 4. Coating liquid pan 5. Coating liquid 6. Substrate 7. Cell 14. Coating liquid supply pipe 15. Coating liquid discharge pipe 20 .. Gravure plate cylinder cleaning device 30 .. Compressed air generator 32 .. Cleaning liquid
33 .. Washing liquid pan 35 .. Micro bubble ejection means 36.. Jet 37.. Micro hole 38.. Micro bubble generating plate 39.

Claims (5)

  A gravure plate cylinder cleaning apparatus that is used by being set in a part of a gravure coating apparatus having a coating gravure plate cylinder on which a cell is formed, and is disposed below the gravure plate cylinder A cleaning liquid pan for storing a cleaning liquid to be used for cleaning, and a part of the gravure plate cylinder immersed in the cleaning liquid, and a lower part of the gravure plate cylinder immersed in the cleaning liquid in the cleaning liquid pan Alternatively, a gravure cylinder cleaning apparatus comprising at least microbubble jetting means for jetting microbubbles from the side and jetting a cleaning liquid.   The cleaning liquid pan also serves as a coating liquid pan of a gravure coating apparatus, and the cleaning liquid is sequentially supplied using means for circulating the coating liquid of the gravure coating apparatus. The gravure plate cylinder cleaning apparatus according to claim 1.   The upper opening of the cleaning liquid pan is provided with an anti-scattering lid for preventing the cleaning liquid from splashing outside from the upper opening of the cleaning liquid pan when the gravure plate cylinder is being cleaned. The gravure plate cylinder cleaning apparatus according to claim 1 or 2, wherein the apparatus is a gravure plate cylinder cleaning device.   The microbubble ejecting means includes at least a compressed air generator and a bubble generating plate that is disposed adjacent to the compressed air generator and is provided with a large number of micropores for generating microbubbles. The gravure plate cylinder cleaning apparatus according to any one of claims 1 to 3, wherein   Place the cleaning liquid pan below the gravure plate cylinder of the gravure coating apparatus, rotate the gravure plate cylinder while immersing a part of it in the cleaning liquid stored therein, and below the rotating gravure plate cylinder or A gravure printing cylinder characterized in that a cleaning liquid is jetted by continuously ejecting microbubbles from the side toward the gravure printing cylinder to remove solids adhering in the cells of the gravure printing cylinder and cleaning. Cleaning method.

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