JP2011183725A - Ink pan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink pan that is able to uniformly supply and attach to a plate cylinder roll even a highly viscous coating liquid or application liquid such as ink, and that facilitates cleaning by reducing the capacity of the ink pan, and hence the amount of application liquid or the like. <P>SOLUTION: In the ink pan for a gravure coater or gravure printer, which supplies a coating liquid or the like to a plate surface by immersing a plate cylinder roll into a coating liquid or an application liquid such as ink, which has been stored in the ink pan, the bottom of the immersed portion of the plate cylinder roll has a saw-teeth shape in cross-section perpendicular to the rotary shaft of the plate cylinder roll. Recess and projections in the form of valleys and mountains are formed along the lengthwise direction of the ink pan. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ink pan 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. For example, a rectangular ink pan provided with a coating liquid discharge port is installed below the plate cylinder roll, and the coating liquid is supplied and stored by a supply pump in the ink pan. 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 of supplying coating liquids 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 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, a foreign substance in the coating liquid is 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 22 is disposed inside an outer peripheral pan 17 having a discharge port 23, and upper and lower portions of a weir 18 that forms a boundary between the liquid storage pan 22 and the outer peripheral pan 17. A method of allowing the ink 19 to flow out from the outer peripheral pan 17 to the discharge port 23 while preventing the ink from staying around the lower portion of the weir 18 by providing an upper notch 25 and a lower notch 26 in each of the two. It is adopted (see FIG. 3).

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

However, in the conventional methods as shown in these patent documents, when high-viscosity coating ink is used, coating liquids such as coating liquid or ink are uniformly fed into the ink pan from the aforementioned supply port. Before filling, the coating liquid flows out from the notch portion of the weir relatively close to the supply port and cannot be spread uniformly in the ink pan. There is a problem that the liquid is not uniformly applied and, in an extreme case, coating omission or reprinting occurs partially and the quality of coating or printing cannot be maintained.

  In particular, when the supply port and the discharge port are on one side of the plate cylinder roll on the downstream side of the ink flow direction in the ink pan, the supplied coating liquid is pushed out by the plate cylinder roll and is conveyed. If the coating liquid flows out from the discharge port before it spreads evenly on the plate surface of the roll, and the supply port and the discharge port are located on each side of the plate cylinder roll The coating liquid injected from the supply port is pushed out to the discharge port side by the plate cylinder roll before spreading uniformly on the plate surface, and there is a problem that the ink cannot be uniformly supplied to the plate surface.

  In addition, the same method has a problem in that the internal shape of the ink pan is complicated, so that the cleaning operation is difficult, and the residual liquid increases as the ink pan volume increases.

  The present invention has been made in order to solve the above-described problems, and even coating liquids such as high-viscosity coating liquids and inks can be uniformly supplied to the plate cylinder roll for landing, and the ink pan It is an object of the present invention to provide an ink pan that simplifies the shape and reduces the volume, thereby reducing the remaining amount of the coating liquid and facilitating cleaning.

  As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a part of a rotating plate cylinder roll is immersed in a coating liquid such as a coating liquid or ink stored in an ink pan. An ink pan of a gravure coater or gravure printing machine that supplies coating liquid to the plate surface, and the bottom surface of the immersion portion of the plate cylinder roll forms a saw blade shape in a cross section perpendicular to the rotation axis of the plate cylinder roll, and its valley The ink pan is characterized in that the unevenness of the crests is formed along the longitudinal direction of the ink pan.

  Since the ink pan of the present invention is configured as described above, the unevenness on the saw blade at the bottom of the ink pan becomes a plurality of continuous weirs, and coating liquids such as coating liquid and ink flowing into the ink pan from the supply nozzle are longitudinally arranged. By being expanded, it is uniformly supplied to the printing plate.

  In addition, the supplied coating liquids such as coating liquid and ink are swept away in the downstream direction as the plate cylinder roll rotates, but the unevenness on the saw blade on the bottom of the ink pan becomes a continuous weir. Since a plurality of reservoirs are formed, coating liquids are not excessively scraped out by the plate cylinder roll, and coating omission can be prevented.

  Furthermore, it is possible to reduce the volume of the ink pan itself by reducing the volume of the ink pan while maintaining the above effects by providing irregularities on the bottom surface of the ink pan, and there is no weir or the like having a notch or an opening. Therefore, cleaning work is easy.

It is explanatory drawing which shows the general | schematic cross-section structure of the ink pan of this invention. It is explanatory drawing which shows a mode when the ink pan of this invention is observed from upper direction. It is explanatory drawing which shows the general | schematic cross-section structure of the conventional ink pan.

  Hereinafter, an ink pan of the present invention will be described with reference to FIGS. 1 to 2 based on an embodiment.

  As shown in FIGS. 1 and 2, the ink pan of the present invention applies the coating liquid to the plate surface 2 while immersing a part of the rotating plate cylinder roll 1 in the coating liquid 7 stored in the ink pan 5. An ink pan for feeding, wherein the bottom surface 6 of the immersion portion of the plate cylinder roll 1 has a saw blade shape in a cross section perpendicular to the rotation axis of the plate cylinder roll 1, and the concave and convex portions of the valleys and peaks are the ink pan 5. The ink pan is formed over the longitudinal direction of the ink pan.

  The ink pan 5 is so arranged that a part of the lower side of the plate cylinder roll 1 is immersed in the liquid when the coating liquid 7 such as a coating liquid or ink is stored in the ink pan 5 below the plate cylinder roll 1. The plate cylinder roll 1 is rotatably mounted, 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 pours the scraped coating liquid into the ink pan 5. .

  On the other hand, the ink pan 5 has a box shape with an open top, and a supply nozzle 8 is installed on the upstream side in the rotation direction of the plate cylinder roll 1 in the ink pan 5 and in the vicinity of the center of the ink pan 5. The pipe 9 is connected to a supply pump, a filter, and a viscosity adjusting device (not shown) so that coating liquids such as coating liquid and ink can be supplied again into the ink pan 5.

  In the ink pan 5, the bottom surface 6 of the immersion portion of the plate cylinder roll 1 has a saw blade shape in a cross section perpendicular to the rotation axis of the plate cylinder roll 1, and the concave and convex portions of the valley portion and the mountain portion extend in the longitudinal direction of the ink pan 5. Is formed. The saw blade shape of the bottom surface 6 may be formed by molding the bottom plate of the ink pan 5 itself, or may be a separate member that is installed in the ink pan 5 later. Further, the shape and number of saw blades and the amount of gap between the plate surface 2 and the like are appropriately determined according to the viscosity, solid content concentration, coating amount and supply amount of the coating liquids.

  The coating liquid that has flowed into the ink pan 5 from the supply nozzle 8 is once dammed up by the uppermost saw-blade peak on the bottom surface 6 and spreads in the longitudinal direction of the ink pan 5, and eventually overflows the peak. It flows into the trough of the side saw blade shape. The coating liquid is sequentially scraped downstream by the flow accompanying the rotation of the plate surface 2 at the immersion portion of the plate cylinder roll 1, but the unevenness of the bottom surface 6 becomes a weir and is spread uniformly in the width direction of the plate surface 2. Therefore, the liquid is not scraped off excessively and the liquid is not lost.

  The coating liquid overflowing the most downstream sawtooth-shaped peak on the bottom surface 6 is pushed out into the drainage groove 10 and then sent again from the drainage port 11 to the supply pump (not shown) through the drainage pipe 12. .

  As described above, the ink pan of the present invention has a saw-blade shape in the cross section whose bottom surface is perpendicular to the rotation axis of the plate cylinder roll, and the irregularities of the valleys and ridges form weirs in the longitudinal direction of the ink pan. Therefore, it is not excessively scraped by the plate surface soaked in coating liquids such as high-viscosity coating liquids and inks, and the liquid landing on the plate surface can be made uniform across the width direction. It can contribute to the improvement of coating or printing quality.

  In addition, because of the above-described effect, the distance between the plate surface and the bottom surface of the ink pan, that is, the gap between the plate surface and the crest-shaped portion of the saw blade, can be reduced. This can contribute to a reduction in the amount of liquids used. Further, since there is no weir or the like having a notch or an opening, cleaning work can be facilitated.

DESCRIPTION OF SYMBOLS 1, 13 ... Plate cylinder roll 2, 14 ... Plate surface 3, 15 ... Doctor 4, 16 ... Doctor holder 5 ... Ink pan 6 ... Bottom plate 7, 19 ... Coating liquid Coating liquids 8 and 20 ... supply nozzles 9, 21 ... supply piping 10 ... drainage grooves 11, 23 ... drainage ports 12, 24 ... drainage piping 17, .... Outer peripheral pan 18 ... Weir 22 ... Liquid storage pan 25 ... Upper notch 26 ... Lower notch 27 ... Supply pump 28 ... Viscosity adjusting device 29 ... Filter

Claims (1)

  In an ink pan of a gravure coater or gravure printing machine that supplies coating liquid to the printing surface while immersing a part of a rotating plate cylinder roll in coating liquid or ink stored in the ink pan. The bottom surface of the immersed part of the roll has a saw blade shape in a cross section perpendicular to the rotation axis of the plate cylinder roll, and the concave and convex portions of the valley and the peak are formed over the longitudinal direction of the ink pan. Ink pan.

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