WO2013065548A1 - 印刷機の印刷液管理装置 - Google Patents
印刷機の印刷液管理装置 Download PDFInfo
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- WO2013065548A1 WO2013065548A1 PCT/JP2012/077486 JP2012077486W WO2013065548A1 WO 2013065548 A1 WO2013065548 A1 WO 2013065548A1 JP 2012077486 W JP2012077486 W JP 2012077486W WO 2013065548 A1 WO2013065548 A1 WO 2013065548A1
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- printing liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/005—Ink viscosity control means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/20—Ink-removing or collecting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/28—Spray apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/24—Rotary letterpress machines for flexographic printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/195—Ink jet characterised by ink handling for monitoring ink quality
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2231/00—Inking devices; Recovering printing ink
- B41P2231/20—Recovering printing ink
Definitions
- the present invention relates to a printing liquid management device for a printing press suitable for use in managing the viscosity of water-based flexographic inks in a flexographic printing press.
- Some printers such as flexographic printers, perform printing while always managing ink in an appropriate state by circulating the ink.
- an ink reservoir is provided so as to face the surface of an ink form roll called an anilox roll, and the ink in the ink reservoir is supplied to fine grooves or holes called cells formed on the surface of the anilox roll, From this cell, printing is performed by supplying ink to a printing cylinder having a rubber or synthetic resin relief plate on its outer periphery.
- flexographic ink is used for this ink
- flexographic ink is supplied from the ink supply source to the ink supply through the ink supply pipe while collecting the flexographic ink from the ink supply source through the ink supply pipe to the ink supply source. Circulate.
- the flexo ink in the ink reservoir is maintained in a dynamic state, so that the flexo ink is prevented from solidifying and enables continuous printing.
- the flexographic printing machine includes an anilox roll and a two-roll system in which a space formed above a nip contact portion of a doctor roll in which rubber is wound around an iron core is used as an ink reservoir (for example, see Patent Document 1), anilox
- anilox There are various types such as a chamber type in which a space called a chamber formed by a roll and a doctor blade that is in sliding contact with the roll is used as an ink reservoir.
- Patent Document 1 describes a technology related to a two-roll flexographic printing machine. This technology removes the ink adhering to the inner wall of the ink pipe in the downstream direction from the ink reservoir in the ink pipe in order to clean and remove the ink remaining in the ink reservoir and the ink pipe in a short time. The air flow is sufficient. Thereby, the residual ink is quickly removed when the ink color is changed.
- a printing machine that performs printing by circulating ink (ink) is not limited to a flexographic printing machine, and includes, for example, a continuous ink jet printer.
- Patent Document 2 describes a technique related to such an ink jet printer. This technology is configured to eject ink supplied from an ink tank that stores ink from the print head toward the surface of the printing material, collect ink that is not used for printing out of the ejected ink, and return the ink to the ink tank. is doing.
- Patent Document 2 discloses that an ink collecting means for collecting ink includes a front receiving tank arranged upstream of the ink tank in the ink collecting direction, and a bubble of ink when the ink is collected into the front receiving tank. And a connecting pipe that communicates the bottom portion of the receiving tank and the bottom portion of the ink tank to reduce ink bubbling.
- the foam prevention means a mist ejection mechanism that ejects the collected ink in a mist toward the inner peripheral wall surface or the ink liquid surface of the receiving tank is applied, and ink mist droplets are applied to the bubbles above the ink liquid surface. It is exemplified that the foam is surely applied and the foam is efficiently removed.
- water-based flexographic inks have been popular from the viewpoint of protecting the global environment in recent years.
- the main components of this water-based flexographic ink are varnish in which an alkali-soluble resin is dissolved, and pigments and additives are added to a water-soluble emulsion resin.
- the additive includes a surfactant.
- the flexographic ink contains a surfactant, the foaming of the ink also occurs in the flexographic printing machine.
- the flexo ink in the ink reservoir is agitated by the surface of the anilox roll, so that ink bubbling easily occurs.
- flexographic ink manages the viscosity in an ink can provided as an ink supply source.
- the foamed ink returns directly from the ink reservoir to the ink can, the foamed ink is stored in the ink can.
- ink foaming is extreme, ink is supplied again before the foam disappears in the ink can, so the foaming increases and the viscosity of the ink in the ink can cannot be properly grasped, and the ink viscosity is controlled. Cannot be performed properly.
- An object of the present invention is to provide a printing liquid management apparatus for a printing press.
- the printing liquid management apparatus for a printing machine performs printing while circulating a printing liquid containing a resin component and a surfactant to be transferred to a printing target surface in a circulation path.
- the printing liquid containing bubbles generated in the circulation path is provided with a liquid supply unit that supplies a viscosity management liquid for managing the viscosity of the printing liquid and defoams the liquid. It is a feature.
- the circulation path includes a tank that stores the printing liquid and uses it for viscosity management of the printing liquid, and a filter that is disposed at a return port of the printing liquid to the tank, and the liquid supply unit includes: It is preferable that the printing liquid containing the bubbles collected in the filter is provided with an ejection nozzle that ejects the viscosity management liquid.
- the filter is installed in an auxiliary tank disposed above the tank, and a discharge unit for allowing the printing liquid dripped through the filter to flow down to the inside of the tank below the auxiliary tank. Preferably it is formed.
- the circulation path includes the tank, a printing liquid reservoir that stores the printing liquid in the vicinity of a printing location, a supply pipe that supplies the printing liquid from the tank to the printing liquid reservoir, and an excess from the printing liquid reservoir. And a recovery pipe for recovering the printing liquid in the tank.
- the tank includes an inner wall surface inclined obliquely upward from the vertical, and the discharge portion of the auxiliary tank is disposed so as to flow down the printing liquid into the tank along the inner wall surface, The bottom portion of the auxiliary tank is preferably inclined downward toward the discharge portion.
- the printing liquid reservoir is defined by an outer peripheral surface of a pair of rotating rolls, a printing liquid recovery pan is provided at the shaft end of the pair of rotating rolls, and the liquid supply unit flows out of the printing liquid reservoir. It is preferable that an ejection nozzle that ejects the viscosity management liquid to the printing liquid temporarily retained in the printing liquid recovery pan is provided.
- the printing liquid reservoir is partitioned by a part of the outer peripheral surface of the rotating roll, a blade that contacts the rotating roll, and an end seal that faces the rotating roll, and supplies the viscosity management liquid to the end seal. It is preferable that a liquid supply unit is provided.
- the supply of the viscosity control liquid by the liquid supply unit is preferably performed intermittently.
- the printing machine is a flexographic printing machine that uses water-based flexographic ink as the printing liquid and water as the viscosity control liquid, and the circulation path includes the tank provided as an ink supply source and anilox.
- An ink reservoir provided to face the surface of the roll, an ink supply tube for supplying the flexographic ink from the tank to the ink reservoir, and an ink recovery tube for recovering excess flexographic ink from the ink reservoir to the tank It is preferable to have
- a printing liquid management method for a printing machine is a printing machine for performing printing while circulating a printing liquid containing a resin component transferred to a printing target surface and a surfactant in a circulation path.
- a management method is characterized in that the printing liquid containing bubbles generated in the circulation path is supplied with a viscosity management liquid for managing the viscosity of the printing liquid to eliminate the bubbles.
- the viscosity management liquid is supplied to the printing liquid containing bubbles generated in the printing machine circulation path to eliminate the bubbles. At the same time as the foam is reduced, the viscosity of the printing liquid is adjusted. Bubbles in the printing liquid hinder the grasping of the viscosity of the printing liquid, but since the bubbles decrease, the viscosity of the printing liquid can be reliably grasped, and from this point, the viscosity management of the printing liquid becomes easy, and The viscosity of the printing liquid is adjusted together with the defoaming, and the viscosity can be easily managed from this point.
- the filter is installed in an auxiliary tank located above the tank, and a discharge part is formed in the lower part of the auxiliary tank to allow the printing liquid dripped through the filter to flow down into the lower tank, the filter is inserted through the filter. Even if bubbles remain in the printing liquid dripped in this way, the liquid is separated downward in the auxiliary tank, so that only the liquid from which the bubbles are further removed is discharged at the lower part of the auxiliary tank. The foam flows down to the tank, and mixing of bubbles into the tank is further suppressed.
- the circulation path is equipped with a tank that stores printing liquid and uses it for viscosity management of the printing liquid.
- a filter is disposed at the return port of the printing liquid to this tank, and contains the foam collected in the filter by the jet nozzle. If the viscosity control liquid is jetted and supplied to the printing liquid, bubbles in the printing liquid containing bubbles are trapped in the filter, the liquid from which bubbles are removed flows down to the tank, and the bubbles trapped in the filter are discharged from the jet nozzle. The foam is defoamed by the jetted viscosity control liquid to become a liquid, and then flows down to the tank. Therefore, mixing of bubbles into the tank is suppressed.
- the tank has an inner wall inclined obliquely upward from the vertical and the printing liquid flows down from the discharge part of the auxiliary tank to the inside of the tank, bubbles are generated when the liquid flows into the tank. Can be suppressed. In addition, it is possible to suppress the generation of bubbles when the liquid flows down to the tank by tilting the bottom of the auxiliary tank downward toward the discharge portion.
- the printing liquid reservoir is defined by the outer peripheral surfaces of the pair of rotating rolls and the shaft end portion of the pair of rotating rolls is equipped with a printing liquid recovery pan, the liquid supply section flows out of the printing liquid reservoir.
- the viscosity management liquid also performs the functions of viscosity adjustment and defoaming in the printing liquid collection pan. Combined use.
- the liquid supply unit supplies the viscosity control liquid to the end seal. If it does so, a viscosity control liquid will combine each effect
- the printing press applies intermittent jetting while using the cheapest and easy-to-manage water as the viscosity management liquid. Therefore, it is possible to efficiently defoam and to prevent excessive injection of water for defoaming.
- the printing liquid is caused to flow down to a temporary storage location, the viscosity management liquid is supplied to the flowing printing liquid, the bubbles of the printing liquid are eliminated, and the printing liquid is passed through the filter. By doing so, the defoaming of the printing liquid can be performed efficiently.
- the printing liquid is collected and temporarily retained at the end of the space where the printing liquid is stored and partitioned on the outer peripheral surface of the pair of rotating rolls in the circulation path, and the viscosity control liquid is supplied to the temporarily retained printing liquid. Even if the defoaming is performed, the defoaming of the printing liquid can be efficiently performed. If viscosity management liquid is supplied to the sliding contact part of the end seal part provided at the end of the space where the printing liquid is stored in the circulation path, it is possible to achieve both viscosity adjustment and lubrication, and to the temporary storage part. In combination with the supply of the viscosity control liquid, it is possible to suppress the occurrence of uneven printing due to the excessive supply of the viscosity control liquid at the end seal portion.
- FIG. 1 is a cross-sectional view of a tank (ink can) showing a main part of an ink management device (an example of a printing liquid management device) of a flexographic printing machine according to a first embodiment of the present invention.
- FIG. 2 is a perspective view showing a main configuration of the flexographic printing machine according to the first embodiment of the present invention.
- 3 (a) and 3 (b) are diagrams showing the main configuration of the flexographic printing machine according to the first embodiment of the present invention.
- FIG. 3 (a) is a front view thereof, and FIG. It is the partial side view.
- FIG. 4 is a perspective view showing an auxiliary tank and a filter of the ink management device of the flexographic printing machine according to the first embodiment of the present invention.
- FIG. 1 is a cross-sectional view of a tank (ink can) showing a main part of an ink management device (an example of a printing liquid management device) of a flexographic printing machine according to a first embodiment of the present
- FIG. 5 is a cross-sectional view showing an ejection nozzle of the ink management device of the flexographic printing machine according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view of a tank (ink can) for explaining the operation of the ink management device (an example of the printing liquid management device) of the flexographic printing machine according to the first embodiment of the present invention.
- FIG. 7 is a cross-sectional view of a tank (ink can) showing an ejection nozzle of an ink management device of a flexographic printing machine according to a first modification of the first embodiment of the present invention.
- FIG. 8 (a) and 8 (b) are cross-sectional views showing an end of an ink reservoir of a flexographic printing machine according to a second modification of the first embodiment of the present invention
- FIG. 8 (a) is a perspective view thereof.
- FIG. 8B is a sectional view thereof.
- FIG. 9 is a perspective view showing a main configuration of a flexographic printing machine according to the second embodiment of the present invention.
- FIGS. 1 to 6 are diagrams for explaining a first embodiment of the present invention
- FIGS. 7 and 8 are diagrams for explaining modifications of the first embodiment of the present invention
- FIG. 9 is a diagram for explaining the first embodiment of the present invention. It is a figure explaining 2 embodiment, and it explains based on these figures.
- the printing machine according to the present embodiment is a flexographic printing machine, and uses water-based flexographic ink as a printing liquid and water as a viscosity management liquid for managing the viscosity of the printing liquid. Further, in the present embodiment, a two-roll flexographic printing machine is illustrated in which a space formed above a nip contact portion between a metal anilox roll and a rubber doctor roll is an ink reservoir. Therefore, the printing liquid management device for a printing press according to the present invention can also be referred to as an ink management device for a flexographic printing press.
- the flexographic printing machine includes an ink above a nip contact portion where a metal anilox roll 1 and a doctor roll 2 in which rubber is wound around an iron core are in nip contact with each other.
- a space serving as a reservoir 7 is formed.
- fine grooves or holes called cells are processed, and the ink in the ink reservoir 7 is supplied into the cells of the anilox roll 1.
- the anilox roll 1 is press-contacted with a printing cylinder 3 having a rubber or synthetic resin relief plate on its outer periphery, and the ink in the cells of the anilox roll 1 is supplied to the relief portion of the printing cylinder 3.
- An impression cylinder 4 is disposed opposite to the printing cylinder 3. Printing is performed by transferring the ink supplied to the relief plate of the printing cylinder 3 onto a printing sheet running between the printing cylinder 3 and the impression cylinder 4.
- the water-based flexo ink used (also simply referred to as ink) contains, as main components, a varnish in which an alkali-soluble resin is dissolved, a water-soluble emulsion resin, a pigment, and an additive.
- the additive contains a surfactant as a pigment dispersant.
- an ink circulation path 10 is provided so as to include the ink reservoir 7.
- the ink circulation path 10 is divided into a supply route provided from an ink can 11 provided as a tank serving as an ink supply source to the ink reservoir 7 and a recovery route provided from the ink reservoir 7 to the ink can 11.
- the supply route includes an ink supply pipe 12 piped from the ink can 11 toward the ink reservoir 7 above the filter, a filter 13, a cock 15 and a pump interposed in the middle of the ink supply pipe 12 from the upstream side. 14, a supply tank 16 provided at a downstream end (positionally at an upper end) of the ink supply pipe 12 to temporarily store ink and adjust an ink supply pressure, and from the supply tank 16 to the ink reservoir 7. And an ink supply pipe 17 piped to the top.
- the ink in the ink can 11 is sucked from the upstream end (positionally lower end) 12a of the ink supply pipe 12 extended to the vicinity of the bottom in the ink can 11 by the operation of the pump 14, and the filter 13 Thus, impurities such as dust are removed and sent to the supply tank 16.
- the ink supply pressure is adjusted by adjusting the liquid level of the ink, and the ink is supplied from the ink supply pipe 17 toward the ink reservoir 7 below.
- the downstream end 17 a of the ink supply pipe 17 is disposed substantially at the center in the axial direction of the ink reservoir 7 and supplies ink substantially uniformly in the axial direction of the ink reservoir 7.
- the recovery route is formed at the bottom of the ink recovery pans 6a and 6b as printing liquid recovery pans disposed at both ends of the nip portion between the anilox roll 1 and the doctor roll 2 where the ink reservoir 7 is formed.
- an ink recovery tube 22 having a downstream end 22 a disposed above the ink can 11.
- the ink collected in the ink can 11 is controlled in its viscosity (also called density), and is always sent from the ink can 11 through the supply route to the ink reservoir 7 in a predetermined viscosity state. Supplied into the roll 1 cell. Many inks are recovered from the ink reservoir 7 through the recovery route into the ink can 11 as surplus ink without being supplied into the cell.
- viscosity also called density
- the ink contains a surfactant
- the anilox roll 1 and the doctor roll 2 are rotated in the ink reservoir 7, the ink is stirred in the ink reservoir 7 and the action of the surfactant is performed. causes the ink to foam.
- the ink flow point from the downstream end 17 a of the ink supply pipe 17 to the ink reservoir 7, the ink flow point from the ink reservoir 7 to the temporary reservoirs 7 a and 7 b, and the downstream end 22 a of the ink recovery pipe 22 to the ink can 11
- the ink is liable to foam even at the location where the ink flows inward due to the action of the surfactant.
- the ink can 11 is disposed immediately below the downstream end 22a of the ink collection tube 22 and above the ink can 11 as shown in FIG.
- Auxiliary tank 30, filter 31 equipped in auxiliary tank 30, and injection nozzle (spray nozzle) that injects water as a viscosity control liquid into filter 31 to eliminate bubbles in filter 31. 32 is provided.
- the ink can 11 is formed in a substantially rectangular parallelepiped shape with resin in this example, but the material and shape are not limited to this.
- the ink can 11 is provided with an inner wall surface 11a inclined obliquely upward from the vertical.
- the inner wall surface 11a is an inclined plane, but may be a curved surface as long as it is inclined obliquely upward from the vertical.
- An auxiliary tank 30 is disposed above the inclined inner wall surface 11a. 1 indicates the horizontal direction, and the arrow VD in FIG. 1 indicates the vertical direction.
- the inner wall surface 11a is formed slightly upward with an inclination of an angle ⁇ 1 with respect to the vertical plane.
- the auxiliary tank 30 is formed in a substantially rectangular parallelepiped as shown in FIG. 4 using stainless steel (SUS: Steel Use ⁇ ⁇ Stainless), but the material and the shape thereof are not limited.
- the discharge part 30a is formed in the lower part of the auxiliary tank 30, and the bottom part 30b of the auxiliary tank 30 inclines downward toward this discharge part 30a. Therefore, the discharge part 30 a is located at the lowermost part of the bottom part 30 b of the auxiliary tank 30. That is, as shown in FIG. 1, the surface (bottom surface) of the bottom 30b is inclined downward by an angle ⁇ 2 with respect to the horizontal plane toward the discharge portion 30a.
- the auxiliary tank 30 is disposed with the discharge portion 30a facing the inner wall surface 11a of the ink can 11 and close to the inner wall surface 11a. It flows out from the bottom part 30b through the discharge part 30a and flows down into the ink can 11 through the inner wall surface 11a.
- the filter 31 is formed of a stainless steel (SUS: Steel Use Stainless) mesh in a rectangular parallelepiped with an upper opening. The material and shape of the filter 31 are not limited, but ink containing bubbles is fed into the filter 31, and the bubbles are crushed or become fine while being held by a mesh. In order to allow the ink to flow down below the mesh, it is preferable to use a mesh of a predetermined standard.
- a SUS wire having a wire diameter of 0.25 mm and a mesh of 70 mesh (70 per inch) are applied. If the mesh is too rough, the foam passes through the mesh and drops into the auxiliary tank 30, and if the mesh is too fine, it is difficult to drop from the mesh into the auxiliary tank 30 even if the foam becomes fine. May overflow.
- the ejection nozzle 32 is a component of the liquid supply unit 35 that supplies water as the viscosity control liquid to the ink as the printing liquid and defoams.
- the liquid supply unit 35 includes a pump 35a that sucks water in the water tank 35c and pressurizes the water to a predetermined pressure, an electromagnetic on-off valve 35b that supplies water from the pump 35a to the injection nozzle 32, a water tank 35c, and a pump 35a. And supply pipes 35d to 35f interposed between the pump 35a and the electromagnetic on-off valve 35b, and between the electromagnetic on-off valve 35b and the injection nozzle 32, respectively.
- the injection nozzle 32 has a narrowed injection opening 32a, and the inner diameter ⁇ is set to a very small level of nanometer (nm).
- the injection amount is 0.50 liters. / Min
- the mist size is preferably about 270 nm.
- the ejection nozzle 32 is disposed so as to eject the ejection toward the upper surface of the foam-like ink in the filter 31.
- the water pressurized by a predetermined pressure (for example, about 0.2 MP) by the pump 35a is sent to the injection nozzle 32 with the timing controlled by the electromagnetic opening / closing valve 35b.
- a predetermined pressure for example, about 0.2 MP
- water is intermittently ejected from the ejection nozzle 32 at a predetermined cycle for a predetermined time.
- it is sufficient to instantaneously spray water on the upper surface of the foam-like ink while the water to be sprayed is for supplementing the water volatilized as a viscosity control liquid. Therefore, if water is jetted excessively, the water content in the ink becomes excessive, and viscosity management, that is, viscosity adjustment cannot be performed properly.
- water is intermittently ejected from the ejection nozzle 32.
- water is jetted 20 to 40 cc every 5 minutes. Since the optimum intermittent ejection method varies depending on the properties of the ink, the numerical value raised here is only an example, but a general aqueous flexographic ink is a suitable numerical value.
- Such an operation of the electromagnetic opening / closing valve 35b can be controlled by electronic control or by a control circuit such as a timer relay.
- the ink circulating in the ink circulation path 10 contains bubbles.
- the ink flows into the ink can 11 from the downstream end 22a of the ink collecting pipe 22 through the recovery route, the ink first flows down on the filter 31 in the auxiliary tank 30 in the upper portion of the ink can 11.
- the ink flowing down to the filter 31 contains bubbles, but the bubbles in the ink are separated above the filter 31, the liquid component in the ink is separated below the filter 31, and the liquid component is an auxiliary component below the filter 31. It drops to the bottom 30b of the tank 30 and flows out from the bottom 30b through the discharge part 30a, and flows down to the inside of the ink can 11 along the inner wall surface 11a as indicated by reference numeral 41 in FIGS.
- the generation of bubbles on the surface of the ink 40 is suppressed as compared with the case where the ink flows directly to the surface of the ink 40 inside the ink can 11. It is done.
- bubbles are accumulated above the filter 31, but water is intermittently ejected from the ejection nozzle 32 onto the bubbles, so that the foam is removed and becomes liquid by the mist-like water. It drops on the bottom 30b and flows down to the inside of the ink can 11 along the inner wall surface 11a through the discharge part 30a as described above.
- the ink 40 of the ink can 11 is collected and its viscosity is measured using a Zahn cup or the like, if there is a bubble in the ink 40, the measurement cannot be performed properly. Since the foam inside is defoamed, the ink viscosity can be measured without hindrance. The viscosity of the ink can be properly managed. Moreover, since the defoaming of the bubbles in the ink 40 is performed using water (viscosity control liquid) for adjusting the viscosity, the viscosity can be adjusted together with the defoaming, and the viscosity management of the ink is easily performed efficiently. Can be done well.
- an injection nozzle 33 arranged so as to directly spray water as a viscosity control liquid onto the upper surface of the ink 40 of the ink can 11 is provided in place of the injection nozzle 32 or together with the injection nozzle 32. Also good. Further, as shown in FIG. 8, the spray nozzle 34 disposed so as to spray the water as the viscosity control liquid directly onto the upper surface of the ink in the temporary storage portions 7 a and 7 b is replaced with the spray nozzle 32 or together with the spray nozzle 32. It may be provided. Moreover, you may use together the injection nozzle 32,33,34.
- the printing machine according to the present embodiment is also a flexographic printing machine, and uses water-based flexographic ink as a printing liquid and water as a viscosity management liquid for managing the viscosity of the printing liquid.
- FIG. 9 shows the present embodiment, the same reference numerals as those in FIGS. 2 and 3 denote the same members, and the description thereof will be omitted.
- a chamber-type flexo that uses a space formed by an anilox roll 1, a seal blade 51, a doctor blade 52, a chamber body 53, and an end seal 54 in sliding contact with the anilox roll 1 as an ink reservoir. Configured as a printing machine. Therefore, the ink circulation path 10 ′ according to this embodiment is different from the first embodiment in the vicinity of the chamber 50, and the ink collection pipe 22 in the collection route is provided with a suction pump 23. Different from one embodiment.
- a jet nozzle 32 is provided in the ink above the filter 31 in the auxiliary tank 30 above the ink can 11 and water as a viscosity control liquid is supplied by the jet nozzle 32. In addition to controlling the viscosity of the ink, it is applied to defoaming the ink bubbles.
- the end of the anilox roll 1 is rotated by the rotation of the anilox roll 1 on the sliding contact surface between the anilox roll 1 and the end seal 54. Since the slidable contact surface of the seal 54 is worn, water as a viscosity control liquid is supplied to the end seal 54 and applied to lubrication of the anilox roll 1 and the end seal 54.
- a supply port 63 for supplying water to the end seals 54 is disposed above each end seal 54.
- the supply port 63 supplies water as a viscosity control liquid to prevent the sliding contact surface (sliding contact portion) of the end seal 54 with the anilox roll 1 from being worn by the rotation of the anilox roll 1.
- the liquid supply unit 60 includes a pump (not shown) that sucks and pumps water in a tank (not shown), an electromagnetic opening / closing valve 61, a flow rate adjusting valve 62, supply pipes 64a to 64c, and a supply port 63.
- the water supplied through the supply pipe 64a by the pump is sent to the supply ports 63 from the supply pipes 64b and 64c through the open / close control by the electromagnetic open / close valve 61 and the flow rate adjustment by the flow rate adjustment valve 62 downstream thereof.
- water is supplied from the supply port 63 intermittently for a predetermined time in a predetermined cycle. This is because intermittent supply is sufficient for lubrication of the anilox roll 1 and the end seal 54, and if water is supplied excessively, the water content in the ink becomes excessive, viscosity control, That is, the viscosity cannot be adjusted properly. Therefore, water is intermittently supplied from the supply port 63 to the end seal 54 portion in order to lubricate the end seal 54 portion without supplying water excessively.
- the water as the viscosity control liquid is efficient because it combines the functions of viscosity adjustment, defoaming, and suppression of wear on the sliding contact surface of the end seal 54.
- the ink viscosity at the end of the anilox roll 1 becomes excessively low.
- the printing surface corresponding to the end of the anilox roll 1 may be printed thinly, according to such a configuration, the water as the viscosity control liquid serves both as viscosity adjustment and defoaming in the ink can 11.
- the viscosity adjustment and the end seal wear prevention are combined, and each effect of improving the printing quality and improving the durability of the end seal portion can be obtained while effectively using the viscosity adjusting liquid. .
- the viscosity control liquid is not limited to water or ink diluted with water.
- the printing liquid containing the resin component and the surfactant to be transferred to the printing target surface is not limited to flexographic ink, but also includes, for example, varnish and coating liquid.
- the printing machine to which the present invention can be applied may be a printing machine that performs printing while circulating a printing liquid containing a resin component transferred to a printing target surface and a surfactant in a circulation path. Not limited to machines.
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Abstract
Description
フレキソ印刷機では、アニロックスロールと呼ばれるインキ着けロールの表面に臨むようにインキ溜りを設け、このインキ溜り内のインキをアニロックスロールの表面に形成されたセルと呼ばれる微細な溝或いは穴に供給し、このセルから、ゴムまたは合成樹脂凸版を外周に備えた印刷シリンダにインキを供給して印刷を行なう。
特許文献2には、こうしたインクジェットプリンタに関する技術が記載されている。この技術は、インクを貯留するインクタンクから供給されるインクをプリントヘッドから被印刷物の表面に向けて噴射し、噴射されたインクのうち印刷に使用されないインクを回収しインクタンクに戻すように構成している。
通常、フレキソインキは、インキ供給源として備えられるインキ缶において粘度を管理するが、インキ溜りから泡立ったインキが直接インキ缶に戻ると、泡立ったインキがインキ缶内に貯留される。インキの泡立ちが極端な場合、インキ缶内で泡が消える前に再びインキ供給される為、泡立ちが増長し、インキ缶内のインキの粘性を適正に把握することができず、インキの粘度管理を適正に行なえない。
前記フィルタは、前記タンクの上方に配置された補助タンク内に装備され、前記補助タンクの下部には、前記フィルタを介して滴下した前記印刷液を下方の前記タンクの内部に流下させる排出部が形成されていることが好ましい。
前記タンクは、鉛直よりも斜め上向きに傾斜した内壁面を備え、前記補助タンクの前記排出部は、前記内壁面を伝って前記印刷液を前記タンクの内部に流下させるように配置されると共に、前記補助タンクの底部は、前記排出部に向けて下降傾斜していることが好ましい。
前記印刷液溜りは、回転ロールの外周面の一部と、前記回転ロールに接触するブレードと、前記回転ロールに対向するエンドシールとにより区画形成され、前記エンドシールに前記粘度管理液を供給する液体供給部が備えられていることが好ましい。
前記印刷機は、前記印刷液として水性のフレキソインキを用いると共に、前記粘度管理液として水を用いるフレキソ印刷機であって、前記循環経路には、インキ供給源として設けられた前記タンクと、アニロックスロールの表面に臨むように設けられたインキ溜りと、前記タンクから前記インキ溜りへ前記フレキソインキを供給するインキ供給管と、前記インキ溜りから前記タンクに余剰の前記フレキソインキを回収するインキ回収管とをそなえていることが好ましい。
前記循環経路において、前記印刷液を一時貯留箇所へ流下させるステップと、前記流下した前記印刷液に対して前記粘度管理液を供給して前記印刷液の泡を泡消するステップと、前記印刷液をフィルタに通過させるステップと、を含むことが好ましい。
前記循環経路において前記印刷液を貯留する空間の端部に備えられたエンドシール部分の摺接部に供給するステップを含むことが好ましい。
印刷液溜りが一対の回転ロールの外周面で区画形成され、この一対の回転ロールの軸端部には印刷液回収パンが装備されている場合には、液体供給部に、印刷液溜りから流出して印刷液回収パンに一時滞留した印刷液に噴射ノズルを備え、この噴射ノズルにより粘度管理液を噴射すれば、粘度管理液が印刷液回収パンにおいても粘度調整と消泡との各作用を兼用する。
液体供給部による粘度管理液の供給は、間欠的に行なうことにより、粘度調整と消泡とを両立させ易く、また、粘度調整と潤滑とを両立させ易くなる。
本印刷液管理方法において、印刷液を一時貯留箇所へ流下させて、流下した印刷液に対して粘度管理液を供給して印刷液の泡を泡消しと、印刷液をフィルタに通過させるようにすれば、印刷液の消泡を効率よく行なうことができる。
循環経路において印刷液を貯留する空間の端部に備えられたエンドシール部分の摺接部に粘度管理液を供給すれば、粘度調整と潤滑とを両立させることができ、しかも、一時貯留箇所への粘度管理液の供給と併用することで、エンドシール部分における過剰な粘度管理液の供給による印刷ムラの発生を抑えることができる。
図1~図6は本発明の第1実施形態を説明する図であり、図7,図8は本発明の第1実施形態の変形例を説明する図であり、図9は本発明の第2実施形態を説明する図であり、これらの図に基づいて説明する。
本実施形態にかかる印刷機は、フレキソ印刷機であって、印刷液として水性のフレキソインキを用いると共に、印刷液の粘度を管理する粘度管理液として水を用いるものとする。また、本実施形態では、金属製のアニロックスロールとゴム製のドクターロールとのニップ接触部分の上方に構成された空間をインキ溜りとする2ロール方式のフレキソ印刷機を例示する。したがって、本発明の印刷機の印刷液管理装置は、フレキソ印刷機のインキ管理装置とも称することができる。
使用する水性のフレキソインキ(単に、インキとも言う)は、主な成分として、アルカリ可溶樹脂を溶解したワニスと、水溶性エマルジョン樹脂と、顔料と、添加物とを含み、これらに水を加えたものであり、添加物には顔料分散剤として界面活性剤が含まれている。
そこで、インキ溜り7を含むように、インキの循環経路10が設けられている。
このインキ循環経路10は、インキ供給源となるタンクとして備えられたインキ缶11からインキ溜り7にかけて設けられた供給ルートと、インキ溜り7からインキ缶11にかけて設けられた回収ルートとに分けられる。
フィルタ31はステンレス鋼(SUS:Steel Use Stainless)製のステンレスメッシュ(金網)によって、上方が開口した直方体に形成されている。このフィルタ31も材料や形状が限定されるものではないが、フィルタ31内には泡を含んだインキが送り込まれ、この泡を網目によって保持しながら、泡が潰れたり微小になったりして液化したインキを網目の下方に流下させるために、所定の規格の網を用いることが好ましい。ここでは、線径が0.25mmのSUS線で70メッシュ(1インチ当たり70本)の網目のステンレスメッシュを適用している。網目が荒過ぎれば泡が網目を素通りして補助タンク30に滴下してしまい、また、網目が細か過ぎれば泡が微小になっても網目から補助タンク30に滴下し難く、フィルタ31内から泡が溢れてしまうおそれもある。
一方、フィルタ31の上方には泡が溜まるが、泡の上に噴射ノズル32から間欠的に水が噴射されるので、霧状の水によって、消泡されて液状になって、補助タンク30の底部30bに滴下し、上記と同様に排出部30aを経て内壁面11aを伝ってインキ缶11の内部に流下する。
したがって、フィルタ31内で泡が溢れることが防止され、また、インキ缶11の内部に流下した微小な泡は、複数が結合しながら大きな泡となって上昇し、インキ缶11の内部のインキ40の表面にて消滅する。
しかも、インキ40内の泡の消泡は、その粘度を調整するための水(粘度管理液)を用いて行なうので、消泡と共に粘度調整を行なうことができ、インキの粘度管理を容易に効率よく行なうことができる。
なお、消泡は低下するものの、上記の実施形態の補助タンク30を省略したり、補助タンク30とフィルタ31とを省略したりすることも可能である。
さらに、図8に示すように、粘度管理液としての水を一時貯留部7a,7b内のインキ上面に直接噴射するように配置した噴射ノズル34を、噴射ノズル32に替えて或いは噴射ノズル32と共に設けてもよい。
また、噴射ノズル32,33,34を併用してもよい。
本実施形態にかかる印刷機も、フレキソ印刷機であって、印刷液として水性のフレキソインキを用いると共に、印刷液の粘度を管理する粘度管理液として水を用いるものとする。
また、エンドシール54のアニロックスロール1との摺接面磨耗防止のために粘度管理用の水を、単に同一供給部から供給した場合、アニロックスロール1端部のインキ粘度が過剰に低くなり、結果、アニロックスロール1端部に相当する印刷面が薄く印刷される場合があるが、かかる構成によれば、粘度管理液としての水が、インキ缶11内においては粘度調整と消泡とを兼用し、エンドシール54部分においては、粘度調整とエンドシール磨耗防止とを兼用し、粘度調整液を効果的に利用しながら印刷品質の向上とエンドシール部分の耐久性向上の各効果を得ることができる。
以上、本発明の実施の形態について説明したが、本発明は、かかる実施形態の限定されるものではなく、本発明の趣旨を逸脱しない範囲で、各実施形態やその変形例を適宜変更したり、適宜組み合わせたりして実施することができる。
また、上記の実施形態では、水を粘度管理液として用いているが、例えば水で希釈したインキを粘度管理液として用いてもよい。この場合、比較的多量の粘度管理液を消泡に用いることができる。
また、印刷対象面に転写する樹脂成分と界面活性剤とを含有する印刷液も、フレキソインキに限らず、例えば、ニスや塗工液等も対象となる。
また、本発明の適用できる印刷機も、印刷対象面に転写する樹脂成分と界面活性剤とを含有する印刷液を、循環経路内で循環させながら印刷を行なう印刷機であればよく、フレキソ印刷機に限らない。
2 ドクターロール
3 印刷シリンダ
4 圧胴
5a,5b フレーム
6a,6b 印刷液回収パンとしてのインキ回収パン
7a,7b 一時貯留部
7 インキ溜り
10,10´ インキ循環経路
11 タンクとしてのインキ缶
12 インキ供給管
13 フィルタ
14 ポンプ
15 コック
16 供給タンク
17 インキ供給管
21a,21b,22 インキ回収管
30 補助タンク
31 フィルタ
32,33,34 噴射ノズル(スプレーノズル)
35,60 液体供給部
35c 水タンク
35a ポンプ
35b,61 電磁開閉弁
35d~35f,64a~64c 供給管
50 チャンバー
51 シールブレード
52 ドクターブレード
53 チャンバー本体
54 エンドシール
63 供給口
62 流量調整弁
Claims (13)
- 印刷対象面に転写する樹脂成分と界面活性剤とを含有する印刷液を、循環経路内で循環させながら印刷を行なう印刷機において、
前記循環経路内で発生した泡を含有する前記印刷液に、該印刷液の粘度を管理するための粘度管理液を供給して消泡する液体供給部をそなえている
ことを特徴とする、印刷機の印刷液管理装置。 - 前記循環経路に、前記印刷液を貯留し該印刷液の粘度管理に利用するタンクと、
前記タンクへの前記印刷液の戻り口に配置されたフィルタとを備え、
前記液体供給部は、前記フィルタに回収された前記泡を含有する前記印刷液に、前記粘度管理液を噴射する噴射ノズルを備えている
ことを特徴とする、請求項1記載の印刷機の印刷液管理装置。 - 前記フィルタは、前記タンクの上方に配置された補助タンク内に装備され、
前記補助タンクの下部には、前記フィルタを介して滴下した前記印刷液を下方の前記タンクの内部に流下させる排出部が形成されている
ことを特徴とする、請求項2記載の印刷機の印刷液管理装置。 - 前記循環経路には、前記タンクと、印刷箇所の近傍において前記印刷液を貯留する印刷液溜りと、前記タンクから前記印刷液溜りに前記印刷液を供給する供給配管と、前記印刷液溜りから余剰の前記印刷液を前記タンクに回収する回収配管と、をさらに備えている
ことを特徴とする、請求項2又は3記載の印刷機の印刷液管理装置。 - 前記タンクは、鉛直よりも斜め上向きに傾斜した内壁面を備え、
前記補助タンクの前記排出部は、前記内壁面を伝って前記印刷液を前記タンクの内部に流下させるように配置されると共に、
前記補助タンクの底部は、前記排出部に向けて下降傾斜している
ことを特徴とする、請求項3記載の印刷機の印刷液管理装置。 - 前記印刷液溜りは一対の回転ロールの外周面で区画形成され、前記一対の回転ロールの軸端部には印刷液回収パンが装備され、
前記液体供給部は、前記印刷液溜りから流出して前記印刷液回収パンに一時滞留した前記印刷液に前記粘度管理液を噴射する噴射ノズルを備えている
ことを特徴とする、請求項4又は5記載の印刷機の印刷液管理装置。 - 前記印刷液溜りは、回転ロールの外周面の一部と、前記回転ロールに接触するブレードと、前記回転ロールに対向するエンドシールとにより区画形成され、
前記エンドシールに前記粘度管理液を供給する液体供給部が備えられている
ことを特徴とする、請求項4又は5記載の印刷機の印刷液管理装置。 - 前記液体供給部による前記粘度管理液の供給は、間欠的に行なわれる
ことを特徴とする、請求項2~7のいずれか1項に記載の印刷機の印刷液管理装置。 - 前記印刷機は、前記印刷液として水性のフレキソインキを用いると共に、前記粘度管理液として水を用いるフレキソ印刷機であって、
前記循環経路には、インキ供給源として設けられた前記タンクと、アニロックスロールの表面に臨むように設けられたインキ溜りと、前記タンクから前記インキ溜りへ前記フレキソインキを供給するインキ供給管と、前記インキ溜りから前記タンクに余剰の前記フレキソインキを回収するインキ回収管とをそなえている
ことを特徴とする、請求項2~8のいずれか1項に記載の印刷機の印刷液管理装置。 - 印刷対象面に転写する樹脂成分と界面活性剤とを含有する印刷液を、循環経路内で循環させながら印刷を行なう印刷機において、前記印刷液を管理する方法であって、
前記循環経路内で発生した泡を含有する前記印刷液に、該印刷液の粘度を管理するための粘度管理液を供給して消泡する
ことを特徴とする、印刷機の印刷液管理方法。 - 前記循環経路において、前記印刷液を一時貯留箇所へ流下させるステップと、
前記流下した前記印刷液に対して前記粘度管理液を供給して前記印刷液の泡を泡消するステップと、
前記印刷液をフィルタに通過させるステップと、を含む
ことを特徴とする、請求項10記載の印刷機の印刷液管理方法。 - 前記循環経路において一対の回転ロールの外周面で区画形成され前記印刷液を貯留する空間の端部に前記印刷液を回収し一時滞留させるステップと、
前記一時滞留している前記印刷液に前記粘度管理液を供給して消泡するステップと、を含む
ことを特徴とする、請求項10又は11記載の印刷機の印刷液管理方法。 - 前記循環経路において前記印刷液を貯留する空間の端部に備えられたエンドシール部分の摺接部に供給するステップを含む
ことを特徴とする、請求項10又は11記載の印刷機の印刷液管理方法。
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KR20140056369A (ko) | 2014-05-09 |
KR101598731B1 (ko) | 2016-02-29 |
EP2774761B1 (en) | 2017-08-02 |
CN103842177A (zh) | 2014-06-04 |
US9168733B2 (en) | 2015-10-27 |
CN103842177B (zh) | 2016-08-17 |
JP2013095053A (ja) | 2013-05-20 |
US20140224139A1 (en) | 2014-08-14 |
JP5773847B2 (ja) | 2015-09-02 |
EP2774761A4 (en) | 2015-07-08 |
EP2774761A1 (en) | 2014-09-10 |
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