JP2014156086A - Gravure coating apparatus provided with cleaning function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure coating apparatus provided with a gravure plate cylinder cleaning device and a gravure plate cylinder cleaning method which can simply and efficiently remove a coating liquid such as an ink or the like adhered to cells of a gravure plate cylinder.SOLUTION: A gravure coating apparatus includes at least all of: a gravure plate cylinder in which cells are formed; an ink pan arranged under the gravure plate cylinder; a gravure plate cylinder cleaning device which is arranged on a side part of the gravure plate cylinder and used for cleaning the gravure plate cylinder, and specially, has a brush for cleaning the gravure plate cylinder; and a cleaning liquid supply device which is combined with the gravure plate cylinder cleaning device to supply a cleaning liquid for cleaning the gravure plate cylinder.

Description

  The present invention relates to a gravure coating apparatus having a gravure plate cylinder, and more particularly to a gravure coating apparatus having a function of cleaning a gravure plate cylinder.

  In gravure coating, a coating liquid such as ink or coating liquid is supplied to the entire gravure plate cylinder in which concave portions called cells are formed on the surface, and after the excess liquid on the surface of the gravure plate is dropped by a doctor, the gravure This is a coating method in which the liquid in the recesses is transferred to a substrate such as paper or film by the pressure from the plate cylinder and the sleeve.

  By the way, in the gravure coating, the coating liquid such as ink or coating liquid adheres in the cell on the surface of the gravure plate cylinder even after the coating is completed. If these remain, streak stains and the coated surface will be non-uniform at the next coating. Therefore, in the gravure coating, it is necessary to clean the surface of the gravure plate cylinder in order to remove the coating liquid such as ink and coating liquid in the cell after the coating is completed. Conventionally, the gravure printing cylinder has been manually cleaned by an operator at a place different from the gravure coating apparatus by removing the gravure printing cylinder.

  However, such a cleaning method is an inefficient method because it takes time and labor to clean one gravure plate cylinder. Also, in terms of work environment, if the coating liquid or cleaning liquid in the cell contains organic solvents that are harmful to the human body, accidents due to suction of organic solvents, etc. or contact with the skin are often caused. End up.

  For this reason, a coating apparatus having a cleaning function capable of cleaning the surface of the gravure plate cylinder while the gravure plate cylinder is attached to the coating apparatus has been proposed (for example, Patent Document 1 below). Specifically, after the coating is completed, the ink in the ink pan is discharged, and cleaning is performed by spraying the cleaning liquid onto the gravure plate cylinder from the cleaning liquid supply device while rotating the gravure plate cylinder.

  Also, with the ink pan filled with the cleaning liquid and the gravure plate cylinder partially immersed in the ink pan, fine bubbles are continuously ejected from the bottom or side of the ink pan toward the gravure plate cylinder to jet the cleaning liquid and gravure plate. A method for cleaning the barrel has been proposed (for example, Patent Document 2 below).

JP-A-5-286126 JP 2011-177914 A

  As in the above-mentioned Patent Document 1, the method of cleaning by spraying the cleaning liquid while rotating the gravure plate cylinder without removing the gravure plate cylinder from the coating apparatus cleans the gravure plate cylinder without requiring labor and time. Is possible. However, since the above method only sprays the cleaning liquid, there is a problem that it is difficult to completely remove the coating liquid such as ink and coating liquid inside the cell. In addition, since the cleaning liquid is sprayed, the cleaning liquid scatters, and when the cleaning liquid contains organic solvents that are harmful to the human body or the like, there are problems such as suction and touching the skin.

  On the other hand, as described in Patent Document 2, the ink pan is filled with the cleaning liquid, and a part of the gravure plate cylinder is immersed, so that microbubbles are continuously ejected from the lower part or the side part of the ink pan and the cleaning liquid is jetted to perform cleaning. This method has an advantage that the cleaning liquid permeates into the cell, so that the ink and coating liquid in the cell can be easily removed. However, there is a problem that the ink pan must be filled with the cleaning liquid so as to immerse a part of the gravure plate cylinder, and a large amount of cleaning liquid is required for one cleaning. Further, since the cleaning liquid is jetted, there is a problem that the cleaning liquid scatters as described above.

  The present invention is intended to solve the above-mentioned problems of the prior art, and can easily and efficiently remove coating liquid such as ink and coating liquid adhering to the cells of the gravure plate cylinder. Another object of the present invention is to provide a gravure plate cylinder cleaning apparatus and a gravure coating apparatus provided with a gravure plate cylinder cleaning method.

  In order to achieve the above object in the present invention, first, the invention of claim 1 is installed in a gravure plate cylinder, a sleeve arranged to contact the plate cylinder, and a lower part of the gravure plate cylinder. In a gravure coating apparatus having an ink pan and a doctor that scrapes ink on the gravure plate cylinder and having a plurality of cells formed on the surface of the gravure plate cylinder, A gravure coating apparatus comprising at least a gravure plate cylinder cleaning unit having a brush for cleaning a gravure plate cylinder and a cleaning liquid supply unit for supplying a cleaning liquid for cleaning the gravure plate cylinder.

  Further, the invention according to claim 2 is the gravure coating apparatus according to claim 1, wherein the cleaning liquid supply unit has a plurality of nozzles for supplying a cleaning liquid in a width direction of the gravure plate cylinder on the gravure plate cylinder side. A light source for irradiating light on the surface of the gravure plate cylinder at an arbitrary position in the width direction of the gravure plate cylinder on the gravure plate cylinder surface side in the gravure plate cylinder cleaning unit, and a reflection reflected on the surface of the gravure plate cylinder A gravure coating apparatus, comprising: a reflectance detection unit that detects light; and a unit that automatically adjusts the flow rate of the cleaning liquid supplied from the nozzle for each nozzle based on the reflectance.

  The invention described in claim 3 is the gravure coating apparatus according to claim 1 or 2, further comprising means for adjusting the moving speed of the brush and the pressing force against the gravure plate cylinder based on the reflectance. It is a gravure coating device.

  According to a fourth aspect of the present invention, in the gravure coating apparatus according to the first to third aspects, the brush has an angle adjusting means capable of adjusting an arbitrary angle with respect to the surface of the gravure plate cylinder. It is the gravure coating device characterized by this.

  According to a fifth aspect of the present invention, in the gravure coating apparatus according to the first to fourth aspects, the angle at which the brush is applied to the gravure plate cylinder is 45 ° to 135 ° with respect to the surface of the gravure plate cylinder. It is a gravure coating device characterized by an angle of °.

  The invention according to claim 6 is the gravure coating apparatus according to any one of claims 1 to 5, wherein the brush for scraping off the coating liquid and the like adhering to the cell and the cleaning liquid supply for supplying a cleaning liquid used for cleaning are provided. It is a gravure plate cylinder cleaning method characterized in that the apparatus is simultaneously operated to remove and wash the coating liquid adhering to the cells of the gravure plate cylinder.

  According to the present invention, when cleaning the gravure plate cylinder, it is not necessary to remove the gravure plate cylinder from the gravure coating apparatus, so the gravure plate cylinder can be efficiently removed without taking labor and time when removing the gravure plate cylinder. It becomes possible to wash.

  In addition, since the brush automatically moves on the surface of the gravure plate cylinder, there is no need to manually clean the gravure plate cylinder, so the use of cleaning liquid containing organic solvents that are harmful to the human body will affect the operator. Cleaning can be performed with extremely little.

  Further, in the gravure plate cylinder cleaning apparatus of the present invention, the cleaning liquid supply device is equipped with an optical sensor for detecting dirt on the surface of the gravure plate cylinder, and the cleaning liquid can be automatically adjusted according to the cleaning situation. Without using it, it is possible to reduce the cost of the cleaning liquid and perform effective cleaning with a small amount of cleaning liquid.

  In addition, since the cleaning liquid supply device can automatically adjust the cleaning liquid according to the cleaning conditions, it can supply a large amount of cleaning liquid to places with a lot of dirt, and the coating liquid that adheres effectively to the cells of the gravure plate cylinder Etc. can be removed.

  Furthermore, since the cleaning liquid automatically flows out from the nozzle provided in the cleaning liquid supply device, the cleaning liquid does not scatter and the surroundings of the gravure coating device will not be contaminated. There is no need.

Explanatory drawing which shows the general | schematic cross-section structure of the gravure coating apparatus provided with the washing | cleaning function of this invention. Explanatory drawing which shows the general | schematic perspective structure of the gravure coating apparatus provided with the washing | cleaning function of this invention. Explanatory drawing which shows the general | schematic cross-section structure of the gravure printing cylinder washing | cleaning apparatus.

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

  In the gravure coating apparatus 12 having the cleaning function of the present invention, for example, as shown in FIGS. 1 and 2, a gravure plate cylinder 2 having cells formed on the surface thereof is provided, and a doctor scrapes off the liquid. 3, a sleeve 4, an ink pan 1, a gravure plate cylinder cleaning device 5 for cleaning the gravure plate cylinder 2, and all of them.

  The gravure plate cylinder cleaning device 5 shown in the figure includes a brush 7 that scrapes off the coating liquid and the like adhering to the cells of the gravure plate cylinder 2, a cleaning liquid supply device 10 that supplies a cleaning liquid, and a nozzle 8 that is a cleaning liquid supply port. And an optical sensor 9 that senses dirt, and is preferably installed on the side of the gravure plate cylinder 2, particularly on the opposite side of the doctor 3. Is more preferable because Moreover, since the structure of the gravure plate cylinder cleaning apparatus 5 exhibits a high cleaning effect, it is preferable to install a brush 7 for scraping off the coating liquid or the like at the lower part of the cleaning liquid supply apparatus 10 for supplying the cleaning liquid. In addition, the cleaning liquid is supplied to the cleaning liquid supply device 10 through a pipe 11 from a pump (not shown), and flows out from the nozzle 8 provided in the cleaning liquid supply device 10. The arrangement interval of the nozzles 8 provided in the cleaning liquid supply apparatus 10 should be such that the gravure plate cylinder 2 is wetted with the cleaning liquid as a whole, and the arrangement interval may be about 5 to 10 cm. preferable. Further, the cleaning liquid flowing out from the nozzle 8 is adjusted so as to drop at the contact point between the gravure plate cylinder 2 and the brush 7, thereby exhibiting a high cleaning effect. The nozzle diameter is not particularly limited as long as the cleaning liquid flows out.

  The brush 7 attached to the gravure plate cylinder cleaning device 5 is preferably in contact with the gravure plate cylinder in order to obtain a high cleaning effect, and its strength is such that the tip of the brush 7 is recessed about 1 cm into the gravure plate cylinder. preferable. The size of the brush 7 is not particularly limited as long as it can secure a sufficient size to polish the gravure plate cylinder 2 from end to end. The hardness and material of the brush 7 are not particularly limited as long as the surface of the gravure plate cylinder 2 is not damaged.

  The cleaning liquid for cleaning the gravure plate cylinder 2 is selected from water, alcohol, ketones, etc. according to the type of coating liquid used for coating, and the coating liquid is cleaned. There is no particular limitation as long as a predetermined amount can be removed.

  The rotation speed when rotating the gravure plate cylinder 2 during cleaning of the gravure plate cylinder 2 is not particularly limited as long as a predetermined amount of dirt such as a coating liquid adhering to the gravure plate cylinder 2 can be removed.

  An optical sensor 9 having a light source for irradiating light on the surface of the gravure plate cylinder and a reflectance detection means for detecting the reflectance of the surface of the gravure plate cylinder 2 on the gravure plate cylinder 2 surface side of the gravure plate cylinder cleaning apparatus 5. It has. First, a calibration curve regarding the amount of cleaning liquid that can sufficiently clean the coating liquid on the surface of the gravure plate cylinder 2 with respect to the reflectance, the moving speed of the brush, and the force pressed against the gravure plate cylinder 2 is obtained. create. Next, the reflectance of the light applied to the surface of the gravure plate cylinder 2 from the light source is calculated, and the flow rate of the cleaning liquid supplied from the nozzle, the moving speed of the brush, and the calibration curve result based on the reflectance value, The force pressed against the gravure plate cylinder can be adjusted. Further, the flow rate of the cleaning liquid, the moving speed of the brush, and the force pressed against the gravure plate cylinder 2 can be adjusted for each nozzle provided arbitrarily.

[Example 1]
Fill the ink pan of the gravure coating device with a resin-based coating liquid whose viscosity is about 100 times that of water, perform the coating operation, discharge the coating liquid remaining on the ink pan, and reduce the rotation speed of the gravure plate cylinder. Adjusted to 60 rpm.

  Next, the cleaning liquid is supplied from the pump to the cleaning liquid supply device attached to the gravure plate cylinder cleaning apparatus, and the cleaning liquid flows out from the nozzle provided in the cleaning liquid supply apparatus, and is attached to the gravure plate cylinder cleaning apparatus. The brush and the optical sensor switch attached to the cleaning liquid supply device for detecting dirt were actuated to remove the coating liquid adhering to the cells of the gravure plate cylinder and perform cleaning.

  During cleaning, the contact angle of the brush and the moving speed of the brush were adjusted as appropriate while visually confirming that the coating liquid adhered to the cells of the gravure plate cylinder was removed. It was confirmed that the coating liquid adhering to the cell of the gravure plate cylinder was scraped out by an appropriate brush contact angle and moving speed. When the gravure plate cylinder was cleaned in this manner, it was found that the surface of the gravure plate cylinder was in the same state as before the coating liquid was adhered, and was reliably cleaned.

[Comparative Example 1]
In Comparative Example 1, cleaning was performed under the same conditions as in Example 1 except that the brush attached to the gravure plate cylinder cleaning apparatus was removed.

  At the time of cleaning, it was confirmed that the coating liquid adhering to the surface of the gravure plate cylinder was washed away with the cleaning liquid, but the remainder of the coating liquid that could not be completely washed could be confirmed inside the cell, and was not completely cleaned. I understood that.

  As described above, according to the gravure coating apparatus having the cleaning function of the present invention, when the gravure plate cylinder is cleaned after the application of the gravure coating apparatus, the gravure plate cylinder is removed from the gravure coating apparatus. Since cleaning can be started, the time can be greatly shortened. In addition, since it is not necessary for the operator to manually clean the gravure cylinder, it does not require much labor, and even if a cleaning liquid containing organic solvents harmful to the human body is used, the impact on the operator Can be kept very low. In addition, even dirt that could not be removed by manual cleaning and uneven cleaning that can be achieved by applying force can completely remove the dirt adhering to the gravure plate cylinder, and there is no uneven cleaning. Cleaning is possible.

  The present invention can be used for the production of a coated product in any gravure coating apparatus, and is used for cleaning a gravure plate cylinder used for coating in a gravure coating apparatus that uses a coating liquid such as an ink or a coating liquid. Demonstrate the effect.

DESCRIPTION OF SYMBOLS 1 ... Ink pan 2 ... Gravure plate cylinder 3 ... Doctor 4 ... Sleeve 5 ... Gravure plate cylinder cleaning apparatus 6 ... Base material 7 ... Brush 8 ... Nozzle 9 ... Optical sensor 10 ... Cleaning liquid supply apparatus 11 ... Pipe 12 ... Gravure coating apparatus

Claims (6)

A gravure printing cylinder; a sleeve arranged to contact the printing cylinder; an ink pan installed at a lower portion of the gravure printing cylinder; and a doctor that scrapes ink on the gravure printing cylinder; In the gravure coating apparatus having a plurality of cells formed on the surface of the plate cylinder,
The gravure plate cylinder includes at least a gravure plate cylinder cleaning unit having a brush for cleaning the gravure plate cylinder and a cleaning liquid supply unit for supplying a cleaning liquid for cleaning the gravure plate cylinder. Gravure coating equipment. In the gravure coating apparatus according to claim 1,
The cleaning liquid supply unit has a plurality of nozzles for supplying a cleaning liquid in the width direction of the gravure plate cylinder side of the gravure plate cylinder side,
A light source for irradiating the gravure plate cylinder surface with light at an arbitrary position in the width direction of the gravure plate cylinder on the gravure plate cylinder side in the gravure plate cylinder cleaning unit, and reflected light reflected on the surface of the gravure plate cylinder And a reflectance detection means for detecting
A gravure coating apparatus comprising means for automatically automatically adjusting the flow rate of the cleaning liquid supplied from the nozzle for each nozzle based on the reflectance. In the gravure coating apparatus according to claim 1 or 2,
A gravure coating apparatus having means for adjusting the speed of movement of the brush and the force pressed against the gravure plate cylinder based on the reflectance. In the gravure coating apparatus according to claim 1 to 3,
The gravure coating apparatus, wherein the brush has angle adjusting means capable of adjusting an arbitrary angle with respect to the surface of the gravure plate cylinder. In the gravure coating device according to claim 1,
An angle at which the brush is applied to the gravure plate cylinder is an angle of 45 ° to 135 ° with respect to the surface of the gravure plate cylinder. In the gravure coating apparatus according to claim 1,
The brush that scrapes off the coating liquid adhering to the cell and the cleaning liquid supply device that supplies the cleaning liquid used for cleaning are simultaneously operated to remove and wash the coating liquid adhering to the cell of the gravure plate cylinder. A gravure plate cylinder cleaning method characterized by that.

Images