JP4835184B2 - Mainstream generator for ink mist recovery - Google Patents

Description

  By collecting the ink mist generated during printing in the printing unit of the gravure printing machine, it is possible to prevent the ink mist from adhering to the printed matter. The present invention relates to a mainstream generator for collecting ink mist that generates a mainstream for collecting the ink mist.

As shown in FIG. 4, ink mist is mainly generated when the plate cylinder is separated from the printed material in the printing unit. The generated ink mist not only stains the gravure printing machine and the surroundings, but also the ink mist adhering to the guide roller is transferred to the printed material or directly adhered to the printed material, thereby deteriorating the color reproducibility of the printed material. In particular, in the material of color printers such as sublimation thermal transfer ribbons, solid printing portions of each color ink of Y (yellow), M (magenta), C (cyan), K (black) on a thin PET (polyethylene terephthalate) film ( Printing is performed as a rectangular pattern in which 100% image line portions are sequentially arranged (Patent Documents 1 and 2). For this reason, as shown in FIG. 5, the sublimation type thermal transfer ribbon has a phenomenon in which a large amount of ink mist generated in the solid printing portion adheres beyond the boundary, and is mixed in the solid printing portion of the adjacent next color ink. If printing is performed using such a sublimation thermal transfer ribbon, there is a problem that the color reproducibility of the printed image is naturally deteriorated.
JP 58-193192 A JP 58-189059 A

In order to solve such a problem, an apparatus for removing ink mist and preventing scattering has been proposed. For example, in order to prevent ink mist generated in a hot melt ink coating apparatus from adhering to the coating apparatus and reduce the frequency of cleaning, an air inlet for exhausting the ink mist is directed to the coating apparatus. There has been proposed a mist removing device having an exhaust duct, a baffle plate disposed on the inlet side in the exhaust duct, a heating device for heating the baffle plate, and an exhaust means connected to the exhaust duct ( Patent Document 3). However, in this conventional method, since the ink mist is collected by the collecting mechanism provided in the printing unit, not only does the work itself in the printing unit during printing difficult, but also the ink mist accumulated by collecting is removed again. There is a problem that the work to be performed must be performed in the printing unit.
In addition, in order to maintain the performance in the device that prevents the ink mist from scattering using the corona discharge wire, an ink collision plate and a rectifying plate for inducing the flow of the ink mist are provided in the vicinity of the ink mist generating portion, An electric wire that stretches the corona discharge wire along the ink roller at a location away from the position where the induced ink mist is generated, and applies a high voltage to the corona discharge wire to reattach the scattered ink mist to the ink roller. There has been proposed an ink mist scattering prevention device in which a high voltage application power source for generating an action force is connected and an ink removing means for removing ink adhering to the surface of the corona discharge wire is disposed ( Patent Document 4). However, in this conventional method, because of the structure such as the ink impingement plate, the current plate, and the corona discharge wire provided in the printing unit, not only does the work itself in the printing unit at the time of printing difficult, but also those structures. There is a problem that the operation of removing the ink mist adhering and accumulating on the ink must be performed again in the printing section.
JP-A-8-174796 JP-A-10-291295

  The present invention has been made to solve the above problems. The purpose of this is to make it easier for the outside of the printing section to remove the collected ink mist and the ink mist that has accumulated and accumulated on the mechanism without making it difficult to do the work in the printing section during printing. Another object of the present invention is to provide a mainstream generator for collecting ink mist.

The mainstream generator for collecting ink mist according to claim 1 of the present invention is an ink mist in the vicinity of the position on the plate cylinder side where the printing object sheet is released from the printing pressure by the plate cylinder and the impression cylinder of the printing unit of the gravure printing machine. A mainstream generator for ink mist recovery that generates a mainstream for recovering
An air inlet for injecting pressurized air from the pipe, an air storage chamber for storing the inflowed air, and an air outflow pipe for discharging the stored air,
The air outflow pipes are a plurality of straight pipes opened at both ends of an inner end connected to the inside of the air accommodating chamber and an outer end extending to the outside of the air containing chamber, and the plurality of air outflow pipes exist. The mainstream generator for ink mist collection is characterized in that its axes are in the same plane, the axial directions are parallel and the outer ends are aligned and shifted so as to be aligned.
An ink mist collecting mainstream generator according to claim 2 of the present invention is the ink mist collecting mainstream generator according to claim 1, wherein an angle formed by the axial direction of the air outflow pipe and the arrangement direction is 20 It is intended to be less than or equal to degrees.

According to the mainstream generator for collecting ink mist according to claim 1 of the present invention, air pressurized at the air inlet is introduced from the pipe, and the introduced air is accommodated in the air accommodating chamber. The contained air is allowed to flow out. The air outflow pipes are straight pipes that open at both ends of the inner end connected to the inside of the air containing chamber and the outer end extending to the outside of the air containing chamber, and there are a plurality of these air outflow pipes. The axes are arranged in the same plane, the axial directions are parallel and the outer ends are aligned so as to overlap each other. That is, a main flow is formed in which the direction of the air flowing from the air outflow pipe is uniform over the entire length of the plurality of air outflow pipes arranged. The main stream is generated in the vicinity of the printing cylinder side position where the sheet to be printed is released from the printing pressure by the printing cylinder and the impression cylinder of the printing unit of the gravure printing machine, thereby generating a secondary flow flowing into the main flow. Ink mist is guided to the mainstream. The mainstream containing the ink mist can be guided to the outside of the printing unit, where the ink mist can be recovered. At this time, the printing unit only needs an ink mist collection main flow generator that generates an air flow composed of a main flow and a sub flow. Therefore, it is possible to easily remove the collected ink mist and the ink mist adhered and accumulated on the mechanism again outside the printing unit without making it difficult to perform the operation in the printing unit at the time of printing. A mainstream generator for mist recovery is provided.
According to the mainstream generator for collecting ink mist according to claim 2 of the present invention, the angle formed by the axial direction and the arrangement direction of the air outflow pipes is 20 degrees or less. By setting the angle, it is possible to efficiently guide the ink mist and generate a main flow having high stability.

Next, embodiments of the present invention will be described with reference to the drawings. The configuration when the mainstream generator for collecting ink mist of the present invention is installed in the printing section is shown in FIG. Moreover, an example of the structure in the mainstream generator for ink mist collection | recovery of this invention is shown in FIG. FIG. 3 is an explanatory diagram showing the operation that occurs in the mainstream in the mainstream generator for collecting ink mist of the present invention. FIG. 4 is an explanatory view of a place where ink mist is generated. Further, FIG. 5 is an explanatory diagram showing stains on the printed matter (sublimation thermal transfer ribbon) due to the ink mist adhering thereto. 1 to 5, 10 is a main flow generator (main flow generator for ink mist recovery), 101 is an air inlet, 102a and 102b are air containing chambers, 103a, 103b and 103c are air outflow pipes, 11 is a main flow, 12 is a side stream, 13 is an ink mist, 20 is a recovery unit, 300 is a plate cylinder, 310 is a doctor, 400 is an impression cylinder, 500 is a web (sheet to be printed), 501a and 501b are solid printing units, and 502a and 502b are It is an ink mist adhesion part.
The plate cylinder 300 and the impression cylinder 400 are a plate cylinder and an impression cylinder of a printing unit of a gravure rotary printing press. As shown in FIG. 1, a web 500 that is a sheet to be printed is passed between the plate cylinder 300 and the impression cylinder 400. When printing is performed, printing pressure is applied by the impression cylinder 400 and the web 500 is pressed against the plate cylinder 300.

  Ink is supplied to the plate surface of the plate cylinder 300 directly from an ink pan or via a finisher roller (not shown). As shown in FIG. 4, the excess ink supplied to the outside of the cell formed on the printing plate is scraped off by the doctor 310, and the ink is left only inside the cell. When the web 500 is pressed against the plate cylinder 300 by the printing pressure, the ink inside the cell is transferred to the web 500 and printing is performed. At this time, not all of the ink inside the cell is transferred to the web 500. Part of the ink remains inside the cell, and part of the ink becomes ink mist and is released into the air. That is, as shown in FIG. 3, the ink mist 13 is generated in the vicinity of the position on the plate cylinder side where the ink supply web 500 is released from the printing pressure by the plate cylinder 300 and the impression cylinder 400.

  The ink mistake 13 that is generated and drifts in the air adheres to the surface somewhere and becomes dirty. In particular, when the ink mistake 13 adheres to the printed material, the color reproducibility of the printed material is deteriorated. For example, when the printed matter is a sublimation thermal transfer ribbon, printing is performed as a rectangular pattern in which solid print portions (100% image line portions) of each color ink are sequentially arranged on the web 500. Therefore, as shown in FIG. 4, a large amount of ink mist 13 generated in the solid printing portions 501a and 501b adheres to the web 500 beyond its proper printing range to form ink mist attaching portions 502a and 502b. The phenomenon is seen. Therefore, it mixes with the solid printing part of the adjacent next color ink. If printing is performed using such a sublimation thermal transfer ribbon, the color reproducibility of the printed image is naturally deteriorated.

  In FIG. 1, a main flow generator 10 is the main flow generator for collecting ink mist of the present invention. Pressurized air is supplied to the supply side of the main flow generator 10, and the compressed air is injected from the injection side of the main flow generator 10. A large number of air outflow pipes (nozzles) are provided on the injection side. An example of the configuration of the mainstream generator 10 is shown in FIG. In FIG. 2, pressurized air is supplied from the air inlet 101. The supplied pressurized air is accommodated in the air accommodating chamber 102a, passes therethrough, and flows out to the air accommodating chamber 102b. The pressurized air stored in the air storage chamber 102b flows out to the air outflow pipes 103a, 103b, 103c,... Arranged in one side surface of the air storage chamber 102b.

  As shown in FIG. 2, the air outflow pipes 103a, 103b, 103c,... Are straight pipes opened at both ends of the inner end connected to the inside of the air accommodating chamber 102b and the outer end extending to the outside of the air accommodating chamber 102b. It is. There are a plurality of the air outflow pipes 103a, 103b, 103c,..., And the plurality of air outflow pipes 103a, 103b, 103c,. They are arranged so that the outer ends are aligned in the direction. It is preferable that the angle formed by the axial direction of the air outflow tubes 103a, 103b, 103c,... By setting the angle, it is possible to efficiently guide the ink mist and generate a main flow having high stability.

  The pressurized air that has flowed into the inner ends of the air outflow pipes 103a, 103b, 103c,... From the air accommodating chamber 102b is jetted from the outer ends that extend outward as shown in FIG. By the injection, an air flow is formed that travels in the axial direction (injection direction) of the main flow generator 10. Initially, the flow of air that travels in the axial direction becomes the flow of air that travels in the direction of arrangement when they are arranged in an overlapping manner. This is because the static pressure of the flowing air becomes smaller than the surrounding air pressure and is drawn to the air outflow pipes 103a, 103b, 103c,. The center of the air flow that proceeds in the arrangement direction is the main flow 11. As shown in FIG. 1, the collection | recovery part 20 exists in the tip on the extension line. The main flow generator 10 is installed in the printing unit so as to form the main flow 11 of air near the portion where the ink mist 13 is discharged into the air. That is, the main flow generator 10 generates a main flow 11 that flows in a direction substantially parallel to the rotation axis of the plate cylinder 300 in the vicinity of the position on the plate cylinder side where the web 500 is released from the printing pressure by the plate cylinder 300 and the impression cylinder 400. It is provided to do.

  When the main flow 11 is generated, as shown in FIG. 3, ambient air joins the main flow 11 so as to be caught by the main flow 11. The merged air flow is the side stream 12. Since the main flow 11 has a flow velocity, its static pressure is smaller than the surrounding air pressure. Therefore, the surrounding air is attracted to the main flow 11, and a force due to viscosity also acts to generate a side flow 12. The main flow 11 itself is pressurized air originally supplied to the main flow generator 10 and does not include the ink mist 13. However, the side stream 12 originally contains air from which ink mist 13 is generated and released. That is, the main flow 11 includes the ink mist 13 by joining the sub flow 12. In other words, the ink mist 13 joins the main flow 13 together with the side flow 12, is guided to the main flow 11, and flows out to the collection unit 20.

  The collecting unit 20 flows in the ink mist 13 contained therein together with the main flow 11 that merges the substream 12. The collection unit 20 has a suction mechanism in order to perform the inflow reliably and strongly, and the main flow 11 is forced to flow into the collection unit 20 by suction. An ink adhering plate is provided in the suction path of the collection unit 20. The ink adhering plate adheres the ink mist 13 and collects the ink mist 13 released into the air in the printing unit. As the ink adhering plate, a metal plate having a large number of holes can be used. Ink mist 13 adheres to a portion of the ink adhering plate where no hole is formed, and the air flowing into the portion where the hole is formed flows. If a large number of such ink adhering plates are arranged at intervals so that the direction of the global air flow is parallel to the direction of the normal to the surface of the ink adhering plate, the ink mist collecting efficiency is improved.

It is a figure which shows a structure when the mainstream generator for ink mist collection | recovery of this invention is installed in the printing part. It is a figure which shows an example of the structure in the mainstream generator for ink mist collection | recovery of this invention. It is explanatory drawing about the operation | movement which generate | occur | produces in the mainstream in the mainstream generator for ink mist collection | recovery of this invention. It is explanatory drawing of the place where the ink mist generate | occur | produces in the printing part of a gravure printing machine. It is explanatory drawing about the stain | pollution | contamination of printed matter (sublimation type thermal transfer ribbon) by ink mist adhering.

Explanation of symbols

10 Mainstream generator (Mainstream generator for ink mist recovery)
DESCRIPTION OF SYMBOLS 101 Air inflow port 102a, 102b Air storage chamber 103a, 103b, 103c Air outflow pipe 11 Main flow 12 Subflow 13 Ink mist 20 Collection | recovery part 300 Plate cylinder 310 Doctor 400 Impression cylinder 500 Web (sheet to be printed)
501a, 501b Solid printing part 502a, 502b Ink mist adhesion part

Claims (2)

A mainstream generator for ink mist collection that generates a mainstream for collecting ink mist in the vicinity of the position on the plate cylinder side where the printing target sheet is released from the printing pressure by the plate cylinder and the impression cylinder of the printing section of the gravure printing machine. There,
An air inlet for injecting pressurized air from the pipe, an air storage chamber for storing the inflowed air, and an air outflow pipe for discharging the stored air,
The air outflow pipes are a plurality of straight pipes opened at both ends of an inner end connected to the inside of the air accommodating chamber and an outer end extending to the outside of the air containing chamber, and the plurality of air outflow pipes exist. The mainstream generator for ink mist collection is characterized in that its axes are in the same plane, the axial directions are parallel and the outer ends are aligned and shifted so as to be aligned. 2. The mainstream generator for ink mist collection according to claim 1, wherein an angle formed by the axial direction of the air outflow pipe and the arrangement direction is 20 degrees or less.

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