EP1362701A1 - Druckverfahren und Druckmachine zur Durchführung des Verfahrens - Google Patents

Druckverfahren und Druckmachine zur Durchführung des Verfahrens Download PDF

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Publication number
EP1362701A1
EP1362701A1 EP02011092A EP02011092A EP1362701A1 EP 1362701 A1 EP1362701 A1 EP 1362701A1 EP 02011092 A EP02011092 A EP 02011092A EP 02011092 A EP02011092 A EP 02011092A EP 1362701 A1 EP1362701 A1 EP 1362701A1
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EP
European Patent Office
Prior art keywords
ink
reservoir
nozzle
ink reservoir
supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02011092A
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English (en)
French (fr)
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EP1362701B1 (de
Inventor
Ichiro Murakawa
Tadao Kubo
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Umetani Mfg Co Ltd
Original Assignee
Umetani Mfg Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Umetani Mfg Co Ltd filed Critical Umetani Mfg Co Ltd
Priority to EP20020011092 priority Critical patent/EP1362701B1/de
Priority to DE60236917T priority patent/DE60236917D1/de
Publication of EP1362701A1 publication Critical patent/EP1362701A1/de
Application granted granted Critical
Publication of EP1362701B1 publication Critical patent/EP1362701B1/de
Anticipated expiration legal-status Critical
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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
    • 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
    • B41F31/025—Ducts formed between two rollers
    • 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
    • B41F31/08—Ducts, containers, supply or metering devices with ink ejecting means, e.g. pumps, nozzles

Definitions

  • the present invention relates to a method of printing corrugated board sheets, and more particularly to a method of preventing ink for printing presses from increasing in viscosity and a printing press for use in practicing the method.
  • the flexographic printing method wherein an aqueous ink is used for printing corrugated board sheets has the advantage that the ink dries rapidly, permitting the sheet to be fed directly to the subsequent step such as stamping immediately after printing.
  • FIG. 9 is a side elevation of a conventional flexographic printing press
  • FIG. 10 is a fragmentary perspective view of the same (see the specification of JP-A No. 5-200986/1993).
  • An inking roll 1 and a squeeze roll 2 are in contact with each other, and an ink reservoir 11 in the form of a groove is formed between the two rolls 1, 2.
  • Disposed under the inking roll 1 in contact therewith is a plate cylinder 9 provided with a printing plate 90.
  • a support roll 91 is disposed under the plate cylinder 9.
  • the inking roll 1 is movable toward or away from the plate cylinder 9.
  • the ink is supplied from a container 96 placed on the floor to the ink reservoir 11 via a pump 97, supply pipe 94 and supply nozzle 4.
  • the ink for use in flexographic printing presses readily dries and therefore becomes solidified due to a rise in viscosity unless incessantly held in circulation. Accordingly, the ink flowing out from the ends of the two rolls 1, 2 is received by ink pans 98, 98 and collected in the container 96 through a return pipe 95 for continuously circulating the ink during printing.
  • the return pipe 95 and the supply pipe 94 are over 8 m in length.
  • the ink invariably partly remains in the return pipe 95 and the supply pipe 94 without being fully collected in the event of a change of ink, for example, for a color change.
  • the remaining portion of ink is washed away and discarded during cleaning.
  • the path of circulation of the ink is long, a large amount of liquid waste is produced by cleaning the path, consequently necessitating great equipment for treating the liquid waste. This entails the problem that the liquid waste treatment requires great initial cost and running cost.
  • FIG. 8 shows a printing press comprising a closed box 3 which is slidable along an ink reservoir 11 and which has incorporated therein a removable ink tank 31 and is provided with an ink supply nozzle 4 (see U.S. Patent No. 5,697,299).
  • An object of the present invention is to provide a printing method wherein a flexographic ink is used and yet which does not require a long circulation path, prevents the ink from increasing in viscosity, diminishes the waste of ink in the event of a change of ink and does not necessitate any great equipment for the treatment of cleaning liquid waste, and more particularly to provide a method of preventing ink from increasing in viscosity and a printing press for use in practicing the method.
  • the present invention provides a method of printing by a printing press wherein an ink is supplied from an ink supply-aspiration nozzle 4 to an ink reservoir 11 provided between an inking roll 1 and a squeeze roll 2 pressed into contact with the inking roll 1, and the ink is transferred from the inking roll 1 to a printing plate attached to a plate cylinder 9 by the rotation of the inking roll 1, the ink supply-aspiration nozzle 4 being connected to a closed box 3 housing an ink tank 31 therein, the closed box 3 and the ink supply-aspiration nozzle 4 being movable along the ink reservoir 11.
  • the printing method is practiced by repeatedly performing the steps of:
  • a diluting liquid is supplied to the ink reservoir 11 while performing the above steps.
  • the supply-aspiration nozzle 4 is moved first toward one end of the ink reservoir 11, and subsequently toward the other end of the reservoir 11.
  • the nozzle 4 Aspirates the ink from one end portion of the ink reservoir 11 and places the ink into the ink tank 31 within the closed box 3, the liquid level of the ink lowers at the end portion, permitting the ink to flow toward the end portion. Since like step is also performed at the other end portion of the reservoir 11, the ink similarly moves along the reservoir 11 toward the other end portion. Ink is then supplied to the reservoir at a location away from the two end portions. A flow of ink also occurs at this time.
  • the ink incessantly flows in the ink reservoir 11, which is continuously stirred, whereby the ink is prevented from increasing in viscosity. Especially because the ink flows between the opposite end portions of the ink reservoir 11, the ink moves over an increased distance and is stirred effectively.
  • the diluting liquid supplied for replenishment is thoroughly mixed with the ink owing to the stirring effect produced by the flow of ink.
  • the ink supply-aspiration nozzle 4 is slidable with the closed box 3 removably housing the ink tank 31 therein, so that the pipe channel between the nozzle 4 and the closed box 3 can be shortened. This prevents the ink from increasing in viscosity without necessitating a long circulation path conventionally required, consequently greatly diminishing the waste of ink to be involved in changing the ink and permitting liquid waste treatment at a much lower cost than conventionally.
  • FIG. 1 is a perspective view showing an inking roll 1 and a squeeze roll 2 of a corrugated board printing press.
  • the present embodiment is characterized by prevention of an increase in the viscosity of ink in an ink reservoir 11.
  • the inking roll 1 and the squeeze roll 2 are arranged so as to be movable toward or away from each other, and the ink reservoir 11 in the form of a groove is provided between the two rolls 1, 2.
  • Ink is supplied to the ink reservoir 11 from ink supply-aspiration nozzles 4 to be described later, and the surface of the liquid is maintained at a predetermined level by a liquid level sensor (not shown).
  • the two rolls 1, 2 are rotatable in directions (inward directions) to squeeze the ink of the reservoir 11, and the ink on the surface of the inking roll 1 is transferred to a printing plate on a plate cylinder 9 to print a corrugated board sheet.
  • the inking roll 1 is a ceramic roll, plated roll or like hard roll provided with fine indentations or projections over the surface thereof, while the squeeze roll 2 has a surface provided by rubber.
  • the rolls 1 and 2 are 1.5 to 4.7 m in axial length although the length differs with the type of printing press.
  • the rolls 1, 2 are provided at opposite ends thereof with weir members 8, 8 for closing the respective ends of the ink reservoir 11. As will be described later, the ink is collected also through the weir members 8, 8.
  • a cover 6 is provided around the rolls 1, 2 and the weir members 8, 8.
  • FIG. 2 is a right side elevation of FIG. 1 and shows the cover 6 as partly broken away.
  • the cover 6 is in the form of a case housing the two rolls 1, 2 therein.
  • the cover 6 includes a top plate 65 which has an opening 61 for fitting therein the nozzles 4, 5, 34, 70 to be described below and movable along the ink reservoir 11, the opening 61 being formed at a position above and opposed to the ink reservoir 11.
  • the cover 6 has a lower side provided with an opening 62 for permitting the printing plate (not shown) on the plate cylinder 9 to come into contact with the inking roller 1.
  • the cover 6 has a bottom plate 63 opposed to the squeeze roll 2 and bent obliquely upward toward the inking roll 1.
  • the upper edge of the bent portion serves as a closing plate 63a positioned in proximity to the inking roll 1 with a clearance 67 formed therebetween.
  • the upper opening 61 of the cover 6 has an opening edge 61a positioned above and close to the squeeze roll 2 with a clearance 66 formed therebetween.
  • the interior of the cover 6 provides a mist chamber 60 around the squeeze roll 2, with the small clearances 66 and 67 formed between the cover and the respective rolls 2, 1.
  • the mist chamber 60 is internally provided with one or a plurality of fine spray nozzles 21.
  • the fine spray nozzles 21 force out a diluting liquid in the form of a fine mist to maintain the mist chamber 60 at a high humidity close to a saturated state to positively wet the surface of the squeeze roll 2 by depositing thereon fine particles of diluting liquid in the form of a thin film.
  • the fine mist is up to 50 ⁇ m in particle size, preferably up to 30 ⁇ m in particle size to ensure ease of application.
  • a pair of fine spray nozzles 21, 21 are arranged below the central portion of the squeeze roll 2, as spaced apart by a small distance along the length of the roll and directed obliquely upward.
  • the nozzles are arranged with their forward ends oriented toward each other (see FIG. 3A).
  • the mist chamber 60 is internally provided with a humidity sensor 68 for controlling the spraying and cessation of spraying.
  • the mist chamber 60 is maintained at a high humidity close to a saturated state.
  • a closed box 3 is disposed above the squeeze roll 2 with the cover top plate 65 positioned therebetween.
  • the closed box 3 is slidable in parallel to the squeeze roll 2.
  • the closed box 3 is a component which is important for supplying and collecting the ink, and also serves to support the ink supply-aspiration nozzles 4 and cleaning liquid waste collecting nozzles 5.
  • the box 3 is coupled to a slide drive device 25 and slidable along the ink reservoir 11.
  • the closed box 3 removably houses therein an ink tank 31 and is externally provided with a nozzle mount plate 33 coupled to a lift drive unit 32 such as a cylinder device and movable upward and downward.
  • a lift drive unit 32 such as a cylinder device and movable upward and downward.
  • the nozzle mount plate 33 is positioned horizontally above the ink reservoir 11 and has two ink supply-aspiration nozzles 4, 4 respectively at opposite ends thereof and two cleaning liquid waste collecting nozzles 5, 5 positioned inwardly of the respective nozzles 4, 4.
  • the nozzles 4, 5 are directed downward.
  • the distance between the two ink supply-aspiration nozzles 4, 4 is 20 to 60 cm, for example, in accordance with the size of the printing press and the size of the closed box 3.
  • the nozzles 4, 5 have sharp lower ends cut obliquely in conformity with the bottom shape of the ink reservoir 11.
  • the nozzles 4, 5 have their lower ends positioned at the same level.
  • the nozzle mount plate 33 is movable upward and downward between a raised position and a lowered position by the lift drive unit 32.
  • the nozzles 4, 5 When in the raised position, the nozzles 4, 5 have their lower ends positioned at a level slightly higher than a predetermined ink level of the ink reservoir 11 (see FIG. 7A).
  • the nozzles 4, 5 When the nozzles 4, 5 are at an intermediate position, the lower ends are immersed in the ink reservoir 11 (see FIG. 7B).
  • the nozzles 4, 5 When in the lowered position, the nozzles 4, 5 have their lower ends positioned at the deepest portion of the ink reservoir 11, such that the nozzle ends are barely held out of wedging contact with the rolls 1, 2 (see FIG. 7C). Stated more specifically, the distance between the point of contact, G, between the two rolls and the lower ends of the nozzles 4, 5 in the lowered position is several millimeters.
  • Each of the ink supply-aspiration nozzles 4 has connected thereto one end of a flexible pipe 4a removably and hermetically extending into the closed box 3 and having the other end immersed in the ink tank 31.
  • the length from the forward end of the nozzle 4 to the immersed end of the pipe 4a in the ink tank 31 can be as short as about 1.2 m.
  • a vacuum suction pipe 35 Connected to the closed box 3 are a vacuum suction pipe 35 and a pressurized air supply pipe 36.
  • pressurized air By sending pressurized air into the closed box 3 from the supply pipe 36, ink can be forced out from the ink tank 31 and supplied from the ink supply-aspiration nozzles 4 to the ink reservoir 11.
  • suction is caused to act on the nozzles 4 to aspirate ink from the ink reservoir 11 and place the ink into the ink tank 31.
  • vacuum suction pipe 35 and the pressurized air supply pipe 36 are individually connected to the closed box 3 as seen in FIG. 1, a common pipe is alternatively usable for aspiration and pressure application.
  • Each of the liquid waste collecting nozzles 5 is connected to a suction pipe 51, which is a flexible pipe, and then to a collecting can 50.
  • a suction pipe 51 which is a flexible pipe
  • a vacuum suction pipe 53 Connected to the can 50 is a vacuum suction pipe 53, through which air is aspirated from the can 50 to reduce the internal pressure of the can 50.
  • suction pipes 52 Also connected to the collecting can 50 are suction pipes 52 which are connected to the respective weir members 8.
  • FIGS. 5A and 5B are views showing the weir member 8 in section along a vertical plane containing the line D-D in FIG. 1.
  • the weir member 8 has a discharge channel 81 extending from a side wall thereof damming the ink reservoir 11 to the upper face thereof and communicating with the collecting can 50 through the suction pipe 52.
  • a liquid waste produced by cleaning the reservoir 11 can be aspirated via the suction pipes 51 and the liquid waste collecting nozzles 5.
  • the liquid waste can be aspirated also through the discharge channels 81 of the weir members 8 and via the suction pipes 52.
  • the closed box 3 is provided with two cleaning liquid supply nozzles 34, 34 and a diluting liquid supply nozzle 70, in addition to the nozzles 4, 5 described.
  • the cleaning liquid supply nozzles 34, 34 are positioned above the inking roll 1 and connected to a cleaning liquid supply device (not shown) for applying dropwise or by spraying a specified amount of cleaning liquid to the rolls 1, 2 for cleaning.
  • diluting liquid supply nozzles 7, 7 Arranged at opposite ends of the ink reservoir 11 are diluting liquid supply nozzles 7, 7 which are so positioned as to avoid collision with the closed box 3.
  • the diluting liquid supply nozzles 7, 7, 70 are connected to a diluting liquid supply device (not shown), which applies a diluting liquid dropwise to the ink reservoir 11 in accordance with the rate at which the ink is used and with the rate of supply of the ink so as not to dilute the ink in the reservoir 11 to excess.
  • the cleaning liquid, the diluting liquid, and the diluting liquid to be sprayed from the fine spray nozzles 21, 21 are tap water according to the present embodiment. Additives may be added to the water, or a liquid suitable for the characteristics of the ink may be used.
  • the slide drive device 25 slidingly moves the closed box 3 along the ink reservoir 11.
  • FIG. 8 shows an example of such device which appears useful.
  • the illustrated device comprises a rail 26 extending along the ink reservoir 11 and positioned above the rolls 1, 2, and rollers 27, 27, 27, 27 connected to the closed box 3 and fitted in the rail 26.
  • the closed box 3 runs along the rail 26.
  • the lift drive unit 32 attached to the closed box 3 moves the nozzle mount plate 33 upward and downward (see FIG. 1).
  • the slide drive device 25 can be selectively set in one of at least two modes, i.e., an ink collection-cleaning liquid collection mode and an ink circulation mode, as will be described below.
  • the ink collection-cleaning liquid collection mode for a color change is such that the closed box 3 is reciprocatingly traveled over the entire length of the ink reservoir 11 once or a plurality of times to collect the ink and cleaning liquid. This operation is shown in FIG. 4A to FIG. 4C.
  • the ink circulation mode is involved in the printing operation, and the operation in this mode is shown in FIG. 3A to FIG. 3D.
  • FIG. 3A to FIG. 3D are diagrams for illustrating the movement of the ink supply-aspiration nozzles 4 in the ink circulation mode.
  • the nozzles 4 are shown as seen from the upstream side of the printing machine of FIG. 1 with respect to the direction of supply of paper, i.e., from the direction of arrow F.
  • the cover 6 and the liquid waste collecting nozzles 5 are not shown.
  • Ink is supplied to the ink reservoir 11 in an empty state from the ink supply-aspiration nozzles 4 provided on the closed box 3 while slidinglymoving the closed box 3 along the ink reservoir 11. At this time, the inking roll 1 and the squeeze roll 2 are held in rotation to prevent a boundary line of ink level from adhering to the rolls 1, 2 and to stir the ink.
  • the liquid level sensor functions to discontinue the supply of ink, and the closed box 3 is once returned to the midportion of the ink reservoir 11 (FIG. 3A).
  • the nozzles 4 are held immersed in the ink reservoir 11, with about 2 liters of ink supplied thereto.
  • the two rolls 1, 2 are thereafter held in rotation to start a printing operation.
  • the squeeze roll 2 is covered with fine particles of diluting liquid over the surface thereof and positively wetted and the mist chamber 60 is filled with a fine mist, by applying the diluting liquid to the roll from the fine spray nozzles 21, 21.
  • the mist chamber 60 is held at a high humidity as nearly saturated with the fine mist. Accordingly, fine particles of diluting liquid for covering the surface of the squeeze roll 2 are continuously carried to the ink reservoir 11 by the rotation of the roll.
  • the diluting liquid will not become compatible and miscible with the ink immediately due to differences between the diluting liquid and the ink in characteristics (specific gravity, viscosity, etc.).
  • the peripheral surface of the squeeze roll 2 is wetted with fine particles of diluting liquid, and the wetting particles are brought into the ink reservoir 11 by the rotation of the roll 2. Consequently, the liquid over the surface of the roll 2 becomes immediately compatible with the ink in the reservoir 11 to mix therewith smoothly, producing no irregularities in the viscosity of the ink.
  • the squeeze roll 2 can be effectively wetted over the surface by arranging the fine spray nozzles 21, 21 below the roll 2, each as directed toward the remote roll end according to the present embodiment.
  • the squeeze roll 2 can be wetted over a wide range with a fine mist since the fine spray nozzles 21, 21 are adapted to apply the fine mist over an increased distance.
  • the fine mist leaking from the narrow outlet 66 of the mist chamber 60 above the squeeze roll 2 produces a highly humid atmosphere around the ink reservoir 11, so that the evaporation of water from the ink reservoir 11 is suppressed to prevent the ink from increasing in viscosity.
  • JP-A No. 6-947/1994 discloses a fine mist filling up the interior of the cover 6 enclosing the squeeze roll 2 therein.
  • the fine spray nozzles 21, 21 are arranged below the squeeze roll 2, permitting fine particles of diluting liquid for covering the roll surface to be carried to the ink reservoir 11 by the rotation of the squeeze roll 2. This makes it possible to effectively dilute the ink even if the squeeze roll 2 is positioned close to the top plate 65 of the cover 6.
  • the ink circulation program When the ink circulation program is set by the user manipulating the control panel (not shown) of the printing press, the ink supply-aspiration nozzles 4 as brought to the raised position at the location shown in FIG. 3A by the lift drive unit 32 supply the ink for about 6 seconds from the ink tank 31 in the closed box 3. During the printing operation, the ink circulation program may be set at all times.
  • the closed box 3 thereafter moves to one end of the ink reservoir 11 as seen in FIG. 3B.
  • the nozzles 4 as brought to this location are lowered to the intermediate position and immersed into the ink in the reservoir 11 (as indicated in solid lines in FIG. 3B).
  • the nozzles 4 After collecting the ink into the closed box 3 for about 2 seconds, the nozzles 4 aspirate the ink from the reservoir 11 while moving from this location toward the midportion of the reservoir 11 over a predetermined section, i.e. about 50 cm according to the embodiment (the position indicated in chain lines in FIG. 3B). This section will be termed a first collecting section.
  • the lower ends of the nozzles 4 are withdrawn from the ink with the aspiration of ink discontinued, and the closed box 3 is moved toward the opposite end of the ink reservoir 11, where the nozzles 4 are lowered into the ink (the position indicated in solid lines in FIG. 3C).
  • the ink is collected into the closed box 3 for about 2 seconds, and the ink is thereafter aspirated while moving the closed box 3 and the nozzles 4 toward the midportion of the reservoir 11 over like section (the position indicated in chain lines in FIG. 3C).
  • the liquid level of the collecting section (termed a second collecting section) lowers, producing a flow of ink in the reservoir 11, i.e., from the midportion of the reservoir 11 toward the second collecting section.
  • the lower ends of the nozzles 4 are withdrawn from the ink with the aspiration of ink discontinued, and the closed box 3 is moved to a position away from the position of aspiration, that is, returned to the midportion of the reservoir 11 according to the embodiment. At this position, ink is supplied to the reservoir 11 from the nozzles 4 as held in the raised position.
  • the liquid level sensor functions to control the liquid level as predetermined.
  • the closed box 3 On completion of the ink circulation mode, the closed box 3 remains at the midportion of the ink reservoir 11 for waiting.
  • suitable amounts of diluting liquid are supplied from the supply nozzles 7, 7 at opposite ends of the reservoir 11 and the supply nozzle 70 on the closed box 3.
  • the nozzles 4 repeatedly aspirate the ink toward the opposite ends of the reservoir 11 and supply the ink at the midportion of the reservoir 11, whereby flows of ink are inceimpulsly produced in the ink reservoir 11 to stir the ink. Especially because the ink flows between opposite ends of the reservoir 11, the distance of movement of the ink is great to effectively stir the ink.
  • the ink supply-aspiration nozzles 4 move with the closed box 3 for containing the ink. This shortens the paths of flow of the ink, obviating the need for a long circulation path conventionally required and preventing the ink from increasing in viscosity.
  • the nozzles 4 may be moved as immersed in the reservoir 11.
  • the ink has a lower viscosity at the locations where the diluting liquid is supplied by the nozzles 7, 7, 70.
  • the ink can be prevented from increasing in viscosity and from producing irregularities in viscosity by the flows of ink produced by the aspiration of ink by the nozzles 4 in the two collecting sections and by the flows of ink produced by replenishing the ink to compensate for the consumption by printing.
  • the ink is collected into the ink tank 31 by the nozzles 4 at the locations where the ink is temporarily reduced in viscosity owing to the supply of diluting liquid from the nozzles 7, 7. This produces an effect to adjust the viscosity of ink within the ink tank 31.
  • FIG. 4A to FIG. 4C are diagrams for illustrating the movement of liquid waste collecting nozzles 5 in the ink collection-cleaning liquid waste collection mode.
  • the rolls 1, 2 are brought out of rotation, and the nozzles 4 and collecting nozzles 5 are moved down to the lowered position in the ink reservoir 11 by the lift drive unit 32 (FIG. 4A) .
  • the suction pipes 51 connected to the nozzles 5 are flexible and will not interfere with the descent of the nozzles 5.
  • the rolls 1, 2 are stopped, and the nozzles 4, 5 are brought to the lowered position in the reservoir 11.
  • the liquid waste is aspirated into the collecting can 50 by the liquid waste collecting nozzles 5 only, with no suction acting on the nozzles 4, while slidingly moving the closed box 3.
  • the suction acting on the collecting can 50 also acts on the discharge channels 81 in the weir members 8 at opposite ends of the ink reservoir 11 at the same time, collecting the cleaning liquid waste also through the weir members 8 into the can 50 (FIG. 4C) .
  • As in collecting the ink almost all amount of liquid waste can be aspirated from the reservoir 11 by reciprocatingly moving the nozzles 5 over the entire length of the reservoir 11 once or twice. After the collection of the liquid waste, the closed box 3 remains at the lengthwise midportion of the reservoir 11 for waiting.
  • the ink can be collected almost without any loss for a change of ink, the quantity of cleaning water required for cleaning the roll can be small therefore, and the resulting liquid waste has a low concentration. Accordingly, there is no need to use great equipment for the treatment of cleaning liquid waste, and the waste can be treated at a reduced running cost.
  • the ink tank 31 within the closed box 3 is replaced.
  • the nozzles 4 remain in the standby position instead of being moved laterally. Suction is caused to act on the collecting can 50.
  • the ink I flowing out of each nozzle 4 flows along the bottom of the ink reservoir 11 toward the weir member 8. A small amount of cleaning liquid waste H remaining uncollected is left on the bottom of the reservoir 11. However, the flow of ink I toward the weir member 8 forces out the remaining waste H.
  • the liquid waste H is forced toward the weir member 8 almost without mixing with the ink I owing to the force of the flow of ink I and the differences between the liquid waste and the ink in properties such as specific gravity and viscosity.
  • the liquid level rises while the ink I and waste H are approaching the weir member 8 as shown in FIG. 5B.
  • the liquid level of the waste gradually rises to close the opening of the discharge channel 81 on the reservoir side with the liquid waste. This reduces the leak of air through the discharge channel 81, permitting the suction to act effectively for the aspiration of the waste.
  • the aspiration by the can 50 is discontinued.
  • This can be realized, for example, by measuring in advance the time taken for the ink supplied to the midportion of the reservoir 11 to reach the end of the reservoir 11 and setting the time value on a timer, or by providing a liquid quality sensor for detecting the difference between the liquid waste and the ink in the quality of liquid at the end of the ink reservoir 11. In actuality, the collection of liquid waste continues for about 40 seconds.
  • two ink supply-aspiration nozzles 4, 4 provided are moved through the two sections as immersed in the ink.
  • the ink is supplied at the midportion of the ink reservoir 11 and aspirated at the end portions thereof.
  • the ink may be supplied at the end portions of the reservoir 11 and aspirated at the midportion thereof.
  • the squeeze roll 2 is used as a member for squeezing the ink on the inking roll 1 according to the foregoing embodiment, the squeezing member is not limited to such a roll.
  • a striplike plate 22 can be held in pressing contact with the inking roll 1 over the entire length of the roll 1 to provide an ink reservoir 11 between the roll 1 and the plate 22.
  • the striplike plate 22 shown in FIG. 6 is directed as opposed to the direction of rotation of the inking roll 1, and a block 23 supporting the plate 22 provides a wall for the ink reservoir 11, with the plate 22 serving also as the bottom portion of the reservoir 11.
  • the ink is supplied to and collected from the reservoir 11 by giving an increased pressure and a reduced pressure, respectively, to the interior of the closed box 3, while the cleaning liquid waste is collected by giving a reduced pressure to the collecting can 50.
  • tubing pumps may be used for supplying and collecting the ink and for collecting the liquid waste.
  • the present invention is applicable not only to aqueous inks but can also be practiced for glycol-type inks which are low in viscosity and dry at a satisfactory rate.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP20020011092 2002-05-17 2002-05-17 Druckverfahren und Druckmaschine zur Durchführung des Verfahrens Expired - Lifetime EP1362701B1 (de)

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EP20020011092 EP1362701B1 (de) 2002-05-17 2002-05-17 Druckverfahren und Druckmaschine zur Durchführung des Verfahrens
DE60236917T DE60236917D1 (de) 2002-05-17 2002-05-17 Druckverfahren und Druckmaschine zur Durchführung des Verfahrens

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EP20020011092 EP1362701B1 (de) 2002-05-17 2002-05-17 Druckverfahren und Druckmaschine zur Durchführung des Verfahrens

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EP1362701B1 EP1362701B1 (de) 2010-07-07

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1972444A3 (de) * 2007-03-20 2011-07-06 Komori Corporation Flüssigkeitsübertragungsvorrichtung
EP1977898A3 (de) * 2007-03-28 2011-07-06 Komori Corporation Flüssigkeitsübertragungsvorrichtung
CN107696682A (zh) * 2017-11-20 2018-02-16 邹文峰 一种可调节油墨品质的丝网印刷机
WO2020126084A1 (en) * 2018-12-20 2020-06-25 Bobst Firenze S.R.L. Ink dispensing system using pressure
CN114571847A (zh) * 2022-03-10 2022-06-03 温州鸣旭机械科技有限公司 一种正反两面同步印刷设备

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JPH06947A (ja) * 1992-06-17 1994-01-11 Isowa Corp インキ転移機構の湿度調整装置
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EP1972444A3 (de) * 2007-03-20 2011-07-06 Komori Corporation Flüssigkeitsübertragungsvorrichtung
EP1977898A3 (de) * 2007-03-28 2011-07-06 Komori Corporation Flüssigkeitsübertragungsvorrichtung
CN107696682A (zh) * 2017-11-20 2018-02-16 邹文峰 一种可调节油墨品质的丝网印刷机
WO2020126084A1 (en) * 2018-12-20 2020-06-25 Bobst Firenze S.R.L. Ink dispensing system using pressure
CN114025965A (zh) * 2018-12-20 2022-02-08 博斯特佛罗伦萨有限公司 使用压力的墨分配系统
US11993071B2 (en) 2018-12-20 2024-05-28 Bobst Firenze S.R.L. Ink dispensing system using pressure
CN114571847A (zh) * 2022-03-10 2022-06-03 温州鸣旭机械科技有限公司 一种正反两面同步印刷设备

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