JP2011083903A - Device for supplying coating liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for supplying coating liquid, which can uniformly apply the coating liquid on a plate cylinder roll while keeping the viscosity and components constant without causing a retention part in an ink pan, even when the coating liquid has high viscosity. <P>SOLUTION: The coating liquid supplying device supplies the coating liquid to a plate surface while part of the rotating plate cylinder roll is immersed in the coating liquid in the ink pan, and includes: at least the ink pan for storing the coating liquid supplied to the plate surface of the plate cylinder roll; a supply nozzle in which a supply port slit for infusing the coating liquids into the ink pan is arranged in the axial direction of the plate cylinder roll; and a drainage groove into which the coating liquids which, after being infused from one end edge side of the ink pan by the supply nozzle, reach part of a barrage at the other end edge of the ink pan positioned on the downstream side in the rotational direction of the plate cylinder roll and then overflow the upper part of the barrage and the excess coating liquids scraped off by a doctor are poured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coating liquid supply apparatus used for supplying a coating liquid such as a coating liquid or ink to a plate cylinder roll of a gravure coater or a gravure printing machine.

In a gravure coater and a gravure printing machine, coating liquids such as coating liquid or ink are supplied to a plate cylinder roll by various methods.
Among them, a supply method using an ink pan is widely used. In this supply method, for example, a rectangular ink pan provided with a coating liquid discharge port is installed below the plate cylinder roll, and after the coating liquid is supplied and stored by the supply pump in the ink pan, the ink pan is A method of supplying the coating liquid to the plate cylinder roll by immersing a part of the printing cylinder roll while rotating it in the coating liquid inside, or a coating liquid supplied and stored in the ink pan by a supply pump Is a method in which coating liquids are supplied through a finisher roll installed in an ink pan without immersing the plate cylinder roll.

  In such a coating liquid supply method, the supply pump supplies a larger amount of coating liquid into the ink pan than the actual amount of coating liquid used, that is, the amount of transfer from the plate cylinder roll to the object to be coated. Therefore, a certain amount of coating liquid is always stored in the ink pan, and the excess coating liquid is discharged from the discharge port provided in the ink pan and then returned to the supply pump. ing.

  In such a coating liquid supply method, the viscosity of the coating liquid can be adjusted to be kept constant by inserting a viscosity adjusting device in the piping path of the infusion pipe connecting the ink pan and the supply pump. In general, foreign substances in the coating liquid are removed by installing a filter.

  On the other hand, as a method for optimizing the amount of liquid stored in the ink pan, there has conventionally been a method of providing a weir along the longitudinal direction in the ink pan and optimizing the amount of liquid stored in coating liquids such as coating liquid and ink. Is generally adopted. More specifically, as shown in Patent Document 1, a weir with notches provided at regular intervals on the upper part is installed so as to form a boundary between the liquid storage portion of the thin ink pan and the excess liquid recovery basket, Furthermore, this is a method of optimizing the liquid storage amount of the coating liquid by providing an adjustment plate that can change the opening amount of the notch.

  Further, as shown in Patent Document 2, an ink storage pan 29 is disposed on one side of an outer peripheral pan 28 having a discharge port 28a, and an upper portion of a weir 26 that forms a boundary between the liquid storage pan 29 and the outer peripheral ink pan 28, and There is also a method in which the upper notch 36 and the lower notch 37 are provided in each of the lower portions so that the ink flows out from the outer peripheral pan 29 to the discharge groove 28 while preventing the ink from staying around the lower portion of the weir 26. It is adopted (see FIG. 4).

Japanese Patent Publication No. 8-032445 JP 7-314649 A

However, in the conventional methods as shown in these patent documents, since the ink is supplied from the supply port by the supply pump via the infusion pipe piped to the ink pan, the viscosity of the ink is high. In such a case, ink stays easily near the supply port or at the corner of the rectangular ink pan, and the solvent content in the ink volatilizes during such operation, so that the solid content concentration of the ink is within the ink pan. In many cases, it was uneven.

  In addition, when supplying highly viscous ink by the same method, the ink flows out from the notch portion of the weir relatively near the supply port before the ink is uniformly injected into the ink pan from the supply port. As a result, the ink cannot be spread evenly in the ink pan, and as a result, uniform liquid landing is not performed on the plate cylinder roll. There was a problem that the quality of work and printing could not be maintained.

  In particular, when the supply port and the discharge port are on one side of the plate cylinder roll downstream of the ink flow direction in the ink pan, the supplied ink is pushed out by the plate cylinder roll, and the plate cylinder roll If the ink flows out from the discharge port before it spreads uniformly on the plate surface, and the supply port and the discharge port are located on each side of the plate cylinder roll, the supply port The ink injected from No. 1 was pushed out to the discharge port side by the plate cylinder roll before spreading uniformly on the plate surface, and there was a problem that the ink could not be uniformly supplied to the plate surface.

  The present invention has been made to solve the above-described problems, and even in coating liquids such as high-viscosity coating liquids and inks, in the ink pan without causing a retention portion of the coating liquid in the ink pan. It is an object of the present invention to provide a coating liquid supply apparatus that can uniformly deposit coating liquid on a plate cylinder roll while keeping the viscosity and components of the stored coating liquid constant.

  Under the circumstances as described above, the invention according to claim 1 is directed to the coating liquid on the plate surface while immersing a part of the rotating plate cylinder roll in the coating liquid in the ink pan or the coating liquid such as ink. An ink pan for storing coating liquid to be supplied to the plate surface of the plate cylinder roll, and a rotation direction of the plate cylinder roll in the vicinity of one end edge of the ink pan. A supply nozzle in which a supply port slit for injecting coating liquid into the ink pan is disposed along the axial direction of the plate cylinder roll, and a supply nozzle from the one end edge side of the ink pan And then reaches the weir part of the other edge of the ink pan located downstream in the rotational direction of the plate cylinder roll via the coating liquid immersion part of the plate cylinder roll, and then the upper part thereof Overflow and spill And at least a drainage groove for pouring excess coating liquid scraped off by a doctor after being supplied to the plate surface of the plate cylinder roll in the ink pan. It is a coating liquid supply device.

  The coating liquid supply apparatus of the present invention has the above-described configuration, and even if the coating liquid such as the coating liquid or ink to be supplied to the plate cylinder roll has a high viscosity, the plate cylinder Since the coating liquid can be uniformly injected into the ink pan from the slit supply port arranged along the axial direction of the roll, and the coating liquid does not stay, the coating liquid is applied to the plate surface of the plate cylinder roll. Can be supplied uniformly.

In addition, the coating liquid injected into the ink pan is swept away downstream of the plate cylinder roll in the rotation direction of the plate cylinder roll, but a certain amount of coating liquid is transferred to the ink pan by the ink pan weir. In addition, the excess coating liquid scraped off by the doctor after adhering to the plate surface of the plate cylinder roll is not directly returned to the ink pan, but directly flows into the drainage groove. Therefore, the ink can not be supplied again to the plate surface, the amount of liquid landing on the plate surface can be stabilized, and the excess coating liquid can flow directly into the drainage groove, thereby Inside, the flow of the coating liquid from the supply port to the discharge port is ensured in a certain direction, and the coating liquid is less likely to stay.

It is explanatory drawing which shows the general | schematic cross-section structure of the coating liquid supply apparatus of this invention. It is explanatory drawing which shows a mode when the coating liquid supply apparatus of this invention is observed from upper direction. It is explanatory drawing which shows the supply state of the coating liquid in the coating liquid supply apparatus of this invention. It is explanatory drawing which shows the general | schematic cross-section structure of the conventional coating liquid supply apparatus.

  Hereinafter, the coating liquid supply apparatus of this invention is demonstrated with reference to FIGS. 1-3 which shows the one Embodiment.

  As shown in FIGS. 1 and 2, the coating liquid supply apparatus of the present invention coats the plate surface 2 while immersing a part of the rotating plate cylinder roll 1 in the coating liquid stored in the ink pan 9. A coating liquid supply apparatus for supplying liquids, and an ink pan 9 for storing coating liquids to be supplied to the plate surface 2 of the plate cylinder roll 1, and in the vicinity of one end edge of the ink pan 9, A supply nozzle 12 is provided upstream of the plate cylinder roll 1 in the rotational direction, and a supply port slit 10 for injecting coating liquid into the ink pan 9 is disposed along the axial direction of the plate cylinder roll 1. And an ink pan located on the downstream side in the rotational direction of the plate cylinder roll 1 through the coating liquid immersion portion of the plate cylinder roll 1 after being injected from the one end edge side of the ink pan 9 by the supply nozzle 12. After reaching the end of the weir 6 on one end, For discharging the overflowing coating liquid overflowing the upper part of the ink and the surplus coating liquid which is supplied to the plate surface 2 of the plate cylinder roll 1 in the ink pan 9 and scraped off by the doctor 3 A coating liquid supply device comprising at least a groove 8.

  The ink pan 9 is disposed below the plate cylinder roll 1, and when the coating liquid 11 a such as a coating liquid or ink is stored in the ink pan 9, a part of the lower side of the plate cylinder roll 1 (coating liquid) Soaking part) is soaked in the coating liquid. In addition, the plate cylinder roll 1 is rotatably attached, and a plate surface 2 is formed on the peripheral surface thereof by concavo-convex cells or diagonal lines.

  The doctor 3 held by the doctor holder 4 scrapes off excess coating liquid adhering to the plate surface 2 of the plate cylinder roll 1 and scrapes it off by a rectifying plate 5 installed under the doctor holder 4. The applied coating liquid is poured directly into the drainage groove 8.

  On the other hand, the ink pan 9 has a ship bottom shape, and a supply port slit 10 for injecting coating liquid into the inside is provided in the vicinity of one end edge located upstream in the rotation direction of the plate cylinder roll 1. A supply nozzle 12 arranged along the axial direction of the body roll 1 is installed. The supply nozzle 12 is connected to a supply pump, a filter, and a viscosity adjusting device (not shown) through a supply pipe 13 so that coating liquids can be supplied into the ink pan 9. The supply port slit 10 is opened in parallel with the plate cylinder roll 1 over the entire plate length on the plate cylinder roll 1 side of the supply nozzle 12, and the opening amount thereof is the viscosity or solid content concentration of the coating liquid, It is determined appropriately depending on the coating amount, supply amount, and the like.

Further, a drainage groove 8 is continuously provided on the downstream side of the rotation direction of the plate cylinder roll 1 of the ink pan 9, and the connection portion with the ink pan 9 rises with an inclination from the bottom surface, and the drainage groove 8 A weir 6 is formed. After being injected into the drainage groove 8 from the one end edge side of the ink pan 9 by the supply nozzle 12, the plate cylinder in the coating liquid immersion part of the plate cylinder roll 1 passes through the coating liquid immersion part of the plate cylinder roll 1. A coating liquid that reaches a portion of the weir 6 on the other edge of the ink pan located downstream of the rotation direction of the roll 1 and then overflows and flows from the upper portion of the ink pan, and a plate cylinder roll in the ink pan 9 Excess coating liquid scraped off by the doctor 3 after being supplied to the first plate surface 2 is poured, and a drain port 14 is opened in the drain groove 8. The drainage port 14 is connected by a supply pump, a filter, a viscosity adjusting device, a drainage pipe 7 and a supply pipe 13 (not shown) so that the inflowing coating liquid can be sent to the supply nozzle 12 again. It has become.

  FIG. 3 shows the flow of coating liquids in the coating liquid supply apparatus having such a configuration. Coating liquids sent from a supply pump (not shown) through a viscosity adjusting device and a filter (not shown) are uniformly supplied from the supply port slit 10 of the supply nozzle 12 into the ink pan 9 from the full width portion of one end edge thereof. Injected and stored up to the height of the weir 6 sandwiched between the ink pan 9 and the drainage groove 8. The coating liquid 11a injected and stored in this way reaches the portion of the weir 6 by the rotation of the plate cylinder roll 1, and then overflows and pushes out the upper portion, and is supplied from the upstream side. Since the coating liquid is continuously supplied from the slit 10, the coating liquid 11 a in the ink pan 9 is gradually fed out toward the drain groove 8 without causing retention. Then, since the coating liquid is uniformly supplied from the supply port slit 10 over the entire width of the ink pan 9, the liquid landing on the plate surface 2 of the plate cylinder roll 1 does not become uneven or missing.

  In such a state, the doctor 11 removes excess coating liquid 11b adhering to the plate surface 2 of the plate cylinder roll 1. The excess coating liquid 11 c scraped off falls directly into the drainage groove 8 by the rectifying plate 5 attached below the doctor holder 4. The coating liquid 11c scraped off by the doctor 3 is not returned to the ink pan but directly poured into the drainage groove 8, so that it is not supplied again to the supply to the printing plate 2, In addition to stabilizing the amount of liquid applied to the printing plate, surplus coating liquid flows directly into the drainage groove, so that the flow of coating liquid from the supply port to the discharge port in a certain direction in the ink pan. Is ensured, and the retention of coating liquids is less likely to occur.

  The surplus coating liquid 11c that has fallen along the rectifying plate 5 and the coating liquid pushed out from the ink pan 9 into the drainage groove 8 are collected in the drainage groove 8 and discharged from the drainage port 14 to the drainage pipe. 7 is sent to a supply pump (not shown) and then sent to the supply nozzle 12 again.

  As described above, in the coating liquid supply apparatus of the present invention, since the supply port slit for injecting the coating liquid is arranged along the axial direction of the plate cylinder roll, the coating liquid is supplied in the ink pan. The coating liquid can be supplied uniformly to the plate surface of the plate cylinder roll, and the flow of the coating liquid injected from the supply port slit into the ink pan is scraped by the doctor. Since it is discharged from the drainage groove without being disturbed by the coating liquid that is poured after being taken out, there is little retention in the ink pan, and the viscosity and solidity of the coating liquid Concentration, etc. are less likely to change, and further, denaturation that affects coating or printing is less likely to occur, contributing to improving coating or printing quality, reducing the amount of coating liquid used, and reducing maintenance work. Is possible.

1, 21 ... Plate cylinder roll 2, 22 ... Plate surface 3, 23 ... Doctor 4, 24 ... Doctor holder 5 ... Current plate 6, 26 ... Weir 7, 27 ... Drainage pipes 8, 28 ... Drainage grooves 9 ... Ink pan 10 ... Supply port slits 11a, 21a ... Stored coating liquids 11b ... Coating liquids 11c attached to the plate surface ..Scraped coating liquids 12... Supply nozzles 13 and 23... Supply pipe 14... Drainage port 25. Notch 37 ... Lower notch 38 ... Supply pump 39 ... Viscosity adjusting device 20 ... Filter

Claims (1)

  A coating liquid supply device for supplying a coating liquid to a printing plate surface while immersing a part of a rotating plate cylinder roll in a coating liquid in an ink pan or a coating liquid such as ink. An ink pan for storing the coating liquid to be supplied to the printing plate, and installed near the one end edge of the ink pan and upstream of the rotation direction of the plate cylinder roll to inject the coating liquid into the ink pan. A supply nozzle in which the supply port slit is regularly arranged along the axial direction of the plate cylinder roll, and after the liquid nozzle is injected from the one end edge side of the ink pan by the supply nozzle, the coating liquid immersion part of the plate cylinder roll In the coating liquid and ink pan that reaches the weir part of the other edge of the ink pan located downstream of the plate cylinder roll in the direction of rotation and then overflows the upper part and flows out. Plate cylinder roll plate Coating liquid such supply apparatus characterized by comprising at least and a drainage groove for pouring the excess coating solution such that come scraped with a doctor after being supplied to.

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