WO1997029911A1 - Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique - Google Patents

Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique Download PDF

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Publication number
WO1997029911A1
WO1997029911A1 PCT/AU1996/000084 AU9600084W WO9729911A1 WO 1997029911 A1 WO1997029911 A1 WO 1997029911A1 AU 9600084 W AU9600084 W AU 9600084W WO 9729911 A1 WO9729911 A1 WO 9729911A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
press
printing
image cylinder
controlling
Prior art date
Application number
PCT/AU1996/000084
Other languages
English (en)
Inventor
Martin David Allum
Original Assignee
Martin David Allum
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
Priority to AUPM7549A priority Critical patent/AUPM754994A0/en
Priority claimed from AUPM7549A external-priority patent/AUPM754994A0/en
Priority to AU30136/95A priority patent/AU3013695A/en
Application filed by Martin David Allum filed Critical Martin David Allum
Priority to PCT/AU1996/000084 priority patent/WO1997029911A1/fr
Priority to AU46596/96A priority patent/AU4659696A/en
Publication of WO1997029911A1 publication Critical patent/WO1997029911A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/22—Means for cooling or heating forme or impression cylinders

Definitions

  • the present invention relates generally to a method and device for controlling the temperature of an image cylinder in a printing-press and relates particularly, though not exclusively, to controlling the temperature of a plate cylinder in an offset printing-press.
  • a bank of ink rollers In a typical offset printing-press there is provided a bank of ink rollers, a bank of water rollers, a plate cylinder, a blanket cylinder, and a bottom cylinder.
  • the plate cylinder has a paper or metal plate, which carries an image to be printed, secured to its circumferential surface.
  • the paper or metal plate has the image burnt into its surface, the image consisting of silver or aluminium.
  • the bank of ink rollers transfer ink from an ink tray to the plate cylinder.
  • the bank of water rollers transfer water from a water bath to the plate cylinder.
  • the water roller in contact with the plate cylinder is referred to as a molloton.
  • the molloton has a sleeve fitted around its circumferential surface.
  • the sleeve is constructed of a cylindrical mesh with a wool fibre woven therein. The molloton together with the water keeps the non-image regions of the plate clean to prevent excessive ink build ⁇ up thereon.
  • the plate cylinder contacts the blanket cylinder and transfers the image from the blanket cylinder onto paper or other print media.
  • paper in the form of a sheet or a continuous roll is fed between the blanket cylinder and the bottom cylinder.
  • Adjacent rollers contact each other, except for an ink or a water duetor roller whic radially oscillates or swings within the bank of ink or water rollers, respectively.
  • the rotational speed of the ink and water rollers can be varied by an operator.
  • the frequency of oscillation of the ink or water ductor rollers can also be adjusted to control the transfer of ink or water, respectively, to the plate cylinder.
  • the amount and rate of ink or water transferred to the plate cylinder can thus be controlled by a combination of the rotational speed of the ink or water rollers and the frequency of oscillation of the ink or water ductor rollers.
  • the water solution be controlled at an optimum pH level and hardness/softness level. This is presently achieved by, for example, the addition of a fountain concentrate which maintains the pH level between 4.8 to 5.2 and the hardness level between 8° dH to 14° dH. This, however, will depend largely on the pH and hardness levels of the water to be treated.
  • the water solution when treated with the fountain concentrate is referred to as fountain water.
  • Emulsification is where fine droplets of water become dispersed in the ink resulting in a dull or unacceptable image. This is particularly common in regions where there is high relative humidity, as for example in Sydney, Australia. Moisture from the humid atmosphere is then dispersed in the ink possibly resulting in emulsification.
  • Bleed-off is where ink builc.s up either on the plate cylinder around the periphery of the plate or on a leading edge of the plate, where it is connected to the plate cylinder, and is then transferred to the blanket cylinder and the paper printed. This can occur where, for example, the viscosity of the ink is gradually reduced during operation of the press and consequently ink builds up in these areas.
  • the mollotons are removed and cleaned with a solvent or safety wash using a brush and subsequently scraped with a blade.
  • the mollotons are then dried using, for example, a sheet of newspaper.
  • the other rollers can either be cleaned in-situ or removed and cleaned using a cloth and, for example, methylated spirits.
  • the ink rollers can be cleaned in- situ using a wash-up tray.
  • the printing-press is then reinked, milled-up and printing recommenced.
  • the cleaning and reinking alone may take up to fifty (50) minutes depending on the ink used.
  • the lower viscosity inks, such as gold ink are likely to consume more time than the higher viscosity inks, such as black ink.
  • a mixture of alcohol and water may be used as an alternative cleaning fluid to solely fountain water as hereinbefore described. Similar problems with emulsification and bleed-off are also experienced with alcohol and water mixtures.
  • An intention of the present invention is to provide a method and device for controlling the temperature of an image cylinder in a printing-press to substantially inhibit problems, such as emulsification or bleed-off, associated with the quality of the image resulting therefrom.
  • a method for controlling the temperature of an image cylinder in a printing-press comprising the step of: maintaining the temperature of the image cylinder within a first effective temperature range whereby, in use, the printing-press can more consistently produce a sharp image on the print medium.
  • the image cylinder is in fluid communication with a cleaning fluid and said method further comprises the step of controlling the temperature of the cleaning fluid within a second effective temperature range so that the temperature of the image cylinder is maintained within the first effective temperature range by heat transfer between the image cylinder and the cleaning fluid.
  • a device for controlling the temperature of an image cylinder in a printing-press wherein the image cylinder is used for transferring ink to a print medium
  • said device comprising: temperature control means for maintaining the image cylinder within a first effective temperature range whereby, in use, the printing-press can more consistently produce a sharp image on the print medium.
  • the image cylinder is in fluid communication with a cleaning fluid
  • the temperature control means comprises : a heat exchange device in heat conductive communication with the cleaning fluid so that the cleaning fluid is maintained within a second effective temperature range, and the temperature of the image cylinder is maintained within the first effective temperature range by heat transfer between the image cylinder and the cleaning fluid.
  • the first effective temperature range is 0°C to 10°C. More typically the first effective temperature range is 2°C to 5°C.
  • the second effective temperature range is 0°C to 20°C.
  • the second effective temperature range is 1°C to 8°C.
  • the heat exchange device comprises a first heat transfer element in contact with the cleaning fluid.
  • the first heat transfer element contains a heat exchange fluid at a controlled temperature whereby, in use, the cleaning fluid transfers heat to the heat exchange fluid via the first element.
  • the controlled temperature is between 0°C to 5°C.
  • the cleaning fluid is at least partly contained in a cleaning fluid bath which is in fluid communication with the image cylinder.
  • the heat exchange device comprises means for recirculating the cleaning fluid through the cleaning fluid bath whereby, in use, the cleaning fluid is returned to said bath at a temperature within the second effective temperature range.
  • the heat exchange device comprises a second heat transfer element in heat conductive communication with the cleaning fluid bath so that, in use, heat from the cleaning fluid is transferred to the second heat transfer element via a wall of said bath.
  • the second heat transfer element is part of a solid state device.
  • the cleaning fluid comprises a water based solution.
  • the cleaning fluid comprises a mixture of water and alcohol.
  • maintaining the temperature of the image cylinder within the first effective temperature range also appears to substantially inhibit bleed-off.
  • Figure 1 is a schematic diagram of a known offset printing-press showing the configuration and disposition of rollers (excluding a blanket and a bottom cylinder) together with a preferred embodiment of the invention.
  • a typical printing-press in this example a known offset printing-press 10, comprises a bank of ink rollers 12, a bank of water rollers 14, and a plate cylinder 16.
  • the known offset printing-press 10 further comprises a header-reservoir 18 plumbed to a water bath 20.
  • the header-reservoir 18 provides cleaning fluid, in this example, water 22, to the water bath 20.
  • the reservoir 18 includes a seal plug (not shown) releasably located in its base. The plug is opened when an actuating rod (not shown) coupled thereto is forced against the base of the water bath 20.
  • a tube 24 surrounding the plug and connected to the base of the reservoir 18 is set at a predetermined height relative to the water bath 20. The reservoir 18 then fills the water bath 20 to this predetermined height and thus maintains a constant level of water 22 in the water bath 20.
  • the device comprises temperature control means, in this example a first heat transfer element 26 constructed of a copper tube formed in a continuous loop arrangement.
  • the copper tube is configured to sit in the base of the water bath 20.
  • the copper tube has an inlet and an outlet each coupled to an upstream and a downstream tube, respectively.
  • a heat exchange fluid in this embodiment iced water or a refrigerant, can be recirculated through the first element 26 using a pump (not shown) .
  • the pump is activated by a temperature controller having a temperature probe submerged in the water 22 in the water bath 20.
  • the temperature of the water 22 is controlled within a temperature range of approximately 1°C to 8°C.
  • a first set point for example 8°C
  • the pump is activated and the iced water or refrigerant recirculates through the first element 26.
  • the water 22 in the water bath 20 is thus cooled and the pump deactivated once the temperature of the water 22 falls below a second set point, for example 1°C.
  • the second effective temperature range is thus 1°C to 8°C.
  • the water 22 can be recirculated through the water bath 20, being cooled to the required temperature outside of the bath 20 and returned to the bath 20 thereafter.
  • the bath 20 can be cooled using a second heat transfer element of a solid state device which is in heat conductive communication therewith.
  • Semiconductor thermoelectric devices working on the Peltier effect are an example of the second heat transfer element suitable for this purpose.
  • the second heat transfer element may be similar to the fir ⁇ t heat transfer element 26 described above but located below the base of the water bath 20 and clad with a suitable insulation material.
  • the device for controlling the temperature of the offset printing-press 10 uses a first or second heat transfer element in contact or heat conductive communication with the cleaning fluid or water bath 20, respectively.
  • the temperature of the plate cylinder 16 may in fact be controlled by removing heat directly from its circumferential surface using, for example, a solid state cooling device located within the roller.
  • One of the bank of water rollers 14 may be cooled in a similar manner, to facilitate heat transfer to it from the plate cylinder 16 via the cleaning fluid and/or intermediate rollers.
  • a further alternative is to isolate a section of the offset printing-press 10 within a housing and control the temperature of the atmosphere contained therein, so as to control the temperature of the plate cylinder 16.
  • the offset printing-press 10 was firstly set up so that the appropriate amount and rate of both ink and water were fed to the plate to produce a sharp image.
  • the temperature of the water 22 in the water bath 20, and the rotational speed setting of the bank of ink rollers 12 and bank of water rollers 14 was then recorded (see Table 1) .
  • the press 10 was then operated without controlling the temperature of the water 22.
  • a print run of 1250 copies the following observations were made. After 400 copies excessive water had built up in the mollotons and they were showing ink tracking around their circumferential surface. After 600 copies the blanket cylinder was showing signs of picking or dust build up.
  • the paper plate was deteriorating and both the plate cylinder 16 and the blanket cylinder had excessive ink built up on each of their circumferential surfaces.
  • the mollotons needed to be removed and cleaned with a solvent, and the plate cylinder 16, the blanket cylinder, and the bottom cylinder each cleaned with a solvent.
  • the stack of copies had to be unloaded every 400 copies to reduce set-off on the reverse side thereof as a consequence of insufficient drying time.
  • the ink coverage, ink usage, water usage, plate condition, blanket cylinder condition, molloton condition, and time elapsed for the image to dry on a copy are recorded in Table 1.
  • the offset printing-press 10 was then operated while controlling the temperature of the water 22 by the periodic addition of ice to the water bath 20. Similar data to that described above was then recorded before and after another print run of 1250 copies (see Table 1) . Each run was printed at the same paper feed speed. The only interruption during this print run, was for approximately 20 seconds, due to a paper misfeed. TABLE 1
  • Table 2 shows the results of another comparative trial where the water bath 20 was periodically filled with ice. Results are shown both without and with the addition of ice to the water bath 20. The print runs in each instance were for a total of 10,000 copies at the same paper feed speed. After approximately 7700 copies ice was no longer added to the bath and the water 22 temperature progressively rose. As the temperature rose there was a deterioration in the sharpness of the image and the transfer of water 22 to the plate cylinder 16 was subsequently increased so as to improve the sharpness of the image. TABLE 2
  • Table 3 shows the results of another comparative trial where iced water was recirculated through the copper tube 26 of the first heat transfer element of the possible embodiment described above.
  • paper curl is reduced so that the paper does not need to be flattened prior to printing on an opposite face thereof.
  • the device described herein could alternatively be fitted to an integrated type printing-press rather than the molloton type printing-press disclosed herein.
  • the temperature control device need not be retrofitted to an existing printing- press but may be manufactured as an integral component thereof.
  • the temperature of the image cylinder may be controlled within a first effective temperature range by a variety of means only some of which have been described above as possible embodiments of the present invention. All such variations and modifications are to be considered within the scope of the present invention the nature of which is to be determined from the foregoing description.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

L'invention concerne un procédé et un appareil pour réguler la température d'un cylindre porte-plaque dans une presse typographique offset. Dans une forme d'exécution, un premier élément de transfert de chaleur (26), réalisé à partir d'un tube de cuivre, est installé sur une presse typographique offset existante (10). Le tube en cuivre vient reposer au fond d'un bain d'eau (20). De l'eau glacée est pompée par le tube en cuivre pour réguler la température de l'eau (22) du bain (22). Dans un exemple préféré, la température de l'eau (22) est régulée dans la plage approximative de 1 °C à 8 °C. Des essais comparatifs montrent que la régulation de la température d'un cylindre porte-plaque, selon la présente invention, produit de manière constante des images nettes. En outre, le risque d'une émulsification est moindre.
PCT/AU1996/000084 1994-08-18 1996-02-16 Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique WO1997029911A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AUPM7549A AUPM754994A0 (en) 1994-08-18 1994-08-18 A method and device for controlling the temperature of an image cylinder in a printing-press
AU30136/95A AU3013695A (en) 1994-08-18 1995-08-18 A method and device for controlling the temperature of an image cylinder in a printing-press
PCT/AU1996/000084 WO1997029911A1 (fr) 1994-08-18 1996-02-16 Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique
AU46596/96A AU4659696A (en) 1996-02-16 1996-02-16 A method and device for controlling the temperature of an image cylinder in a printing-press

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPM7549A AUPM754994A0 (en) 1994-08-18 1994-08-18 A method and device for controlling the temperature of an image cylinder in a printing-press
AU30136/95A AU3013695A (en) 1994-08-18 1995-08-18 A method and device for controlling the temperature of an image cylinder in a printing-press
PCT/AU1996/000084 WO1997029911A1 (fr) 1994-08-18 1996-02-16 Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique

Publications (1)

Publication Number Publication Date
WO1997029911A1 true WO1997029911A1 (fr) 1997-08-21

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PCT/AU1996/000084 WO1997029911A1 (fr) 1994-08-18 1996-02-16 Procede et dispositif pour reguler la temperature d'un cylindre porte-plaque dans une presse typographique

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AU (1) AU3013695A (fr)
WO (1) WO1997029911A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3013695A (en) * 1994-08-18 1996-02-29 Martin David Allum A method and device for controlling the temperature of an image cylinder in a printing-press

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929612C (de) * 1953-04-05 1955-06-30 Rudolf Mueller Offsetdruckverfahren und Vorrichtung
AU4513764A (en) * 1964-05-29 1965-12-02 Kalle Aktiengesellschaft Device for wetting offset plates in offset presses
EP0163808A2 (fr) * 1984-04-30 1985-12-11 Markem Corporation Dispositif pour imprimer avec une encre chauffée
US4753165A (en) * 1985-11-23 1988-06-28 Koenig & Bauer Aktiengesellschaft Short inking unit for an offset rotary printing machine
GB2207636A (en) * 1987-08-04 1989-02-08 Seiichi Kurosawa Cooling system for offset printing press
EP0419389A1 (fr) * 1989-09-20 1991-03-27 La Poste Machine d'impression, notamment sur papier, et de séchage de l'impression, encre correspondante, et procédé de fabrication d'une telle encre
US5178064A (en) * 1990-10-08 1993-01-12 Man Roland Druckmasachinen Ag Thermal regulator for a printing form laid about a printing form cylinder for anaqueous offset printing
GB2270652A (en) * 1992-09-18 1994-03-23 Heidelberger Druckmasch Ag Printing-unit device of a web-fed printing press with smearing-prevention apparatus.
US5309838A (en) * 1992-01-30 1994-05-10 Baldwin-Gegenheimer Gmbh System for keeping the printing plates of a printing press at a moderate temperature
AU3013695A (en) * 1994-08-18 1996-02-29 Martin David Allum A method and device for controlling the temperature of an image cylinder in a printing-press

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929612C (de) * 1953-04-05 1955-06-30 Rudolf Mueller Offsetdruckverfahren und Vorrichtung
AU4513764A (en) * 1964-05-29 1965-12-02 Kalle Aktiengesellschaft Device for wetting offset plates in offset presses
EP0163808A2 (fr) * 1984-04-30 1985-12-11 Markem Corporation Dispositif pour imprimer avec une encre chauffée
US4753165A (en) * 1985-11-23 1988-06-28 Koenig & Bauer Aktiengesellschaft Short inking unit for an offset rotary printing machine
GB2207636A (en) * 1987-08-04 1989-02-08 Seiichi Kurosawa Cooling system for offset printing press
EP0419389A1 (fr) * 1989-09-20 1991-03-27 La Poste Machine d'impression, notamment sur papier, et de séchage de l'impression, encre correspondante, et procédé de fabrication d'une telle encre
US5178064A (en) * 1990-10-08 1993-01-12 Man Roland Druckmasachinen Ag Thermal regulator for a printing form laid about a printing form cylinder for anaqueous offset printing
US5309838A (en) * 1992-01-30 1994-05-10 Baldwin-Gegenheimer Gmbh System for keeping the printing plates of a printing press at a moderate temperature
GB2270652A (en) * 1992-09-18 1994-03-23 Heidelberger Druckmasch Ag Printing-unit device of a web-fed printing press with smearing-prevention apparatus.
AU3013695A (en) * 1994-08-18 1996-02-29 Martin David Allum A method and device for controlling the temperature of an image cylinder in a printing-press

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Publication number Publication date
AU3013695A (en) 1996-02-29

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