EP2818321A1 - Procédé et appareil de type simplifié et combiné pour nettoyer les cylindres de machines d'impression rotatives - Google Patents

Procédé et appareil de type simplifié et combiné pour nettoyer les cylindres de machines d'impression rotatives Download PDF

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Publication number
EP2818321A1
EP2818321A1 EP14173960.7A EP14173960A EP2818321A1 EP 2818321 A1 EP2818321 A1 EP 2818321A1 EP 14173960 A EP14173960 A EP 14173960A EP 2818321 A1 EP2818321 A1 EP 2818321A1
Authority
EP
European Patent Office
Prior art keywords
web
solvent
liquid
cylinders
cleaning
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.)
Withdrawn
Application number
EP14173960.7A
Other languages
German (de)
English (en)
Inventor
Marco Corti
Riccardo Fumagalli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elettra Srl
Original Assignee
Elettra Srl
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 Elettra Srl filed Critical Elettra Srl
Publication of EP2818321A1 publication Critical patent/EP2818321A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/24—Wiping devices using rolls of cleaning cloth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/30—Recovering used solvents or residues
    • B41P2235/31—Recovering used solvents or residues by filtering

Definitions

  • the invention relates to a process and to an apparatus of combined and simplified type for cleaning the cylinders of continuous printing machines, for example of the "reel" type, provided with rubber printing cylinders that act simultaneously on opposite sides of an endless web of paper unwound from a reel.
  • Fig. 1 of the accompanying drawing which illustrates a series of two groups of printing cylinders C1, C1' and Cn, Cn', with which there are associated respective cleaning units P1, P1' and Pn, Pn', for example of the aforesaid type, and between which cylinders the web N of paper or other material to be printed travels in the direction F.
  • P1, P1' and Pn, Pn' for example of the aforesaid type
  • cleaning liquids with oil-based solvents can be advantageously be used, with the evaporation factor of the solvent substantially halved with respect to that of convention water and solvent mixtures, which for this reason can be used substantially in double the amount and are characterised by a very low water content, so as not to alter the properties of tensile strength of the web N inserted in the printing machine, above all if this is made of paper.
  • this is always intended as said oil-based solvent.
  • the web N can carry on its opposite sides, for example, around 80 ml of cleaning liquid with solvent, so as to allow the system to substantially halve the printing machine cleaning cycle times, with respect to the cycles that use conventional solvent with a high evaporation factor.
  • a large amount of said cleaning liquid with solvent, or all of this liquid is supplied directly to at least one or both of the opposite sides of the paper web N, by a primary unit 1 located immediately upstream of the entire set of printing cylinders.
  • printing machines use more than two groups of printing cylinders, usually three or four, so that each cleaning unit P must normally supply just over one millilitre of liquid with solvent.
  • a very high percentage, in the order of around 80-90% of the cleaning liquid with solvent, is thus carried by the web N that passes through the various printing cylinders in succession, the cleaning units P of which, of cloth or other type, use this liquid originating from the web N and also themselves supply an amount of liquid with oil-based solvent in the order of 10-20%, at least sufficient to maintain the inactive side areas of these printing cylinders, located outside the paper web N and which can be of different width, lubricated and clean.
  • the liquid supplied by the cloth-type cleaning unit P serving the printing cylinders contains the same type of liquid with solvent supplied by said primary unit 1 and may contain a very high percentage of water, which satisfactorily performs the task of lubrication and ensures better removal of the particles and shreds of paper, above all when the web N comprises recycled paper, which has the tendency to turn to dust.
  • This aqueous component cooperating through friction with the printing cylinder, tends to dry rapidly and the small amount which may reach the web N, finds this latter already impregnated with oil-based solvent and therefore in a substantially impermeable condition.
  • the primary unit 1 can be responsible for supplying a correspondingly higher amount, or even all of the solvent that can be safely carried by the web N through the subsequent drying oven. Therefore, the aforesaid supply percentages of cleaning liquid with solvent can be intended as included in the range of 80-100% for the primary unit 1 and the remaining 0-20% split between the assembly of the cleaning units P.
  • Fig. 2 which shows in a plan view the primary unit 1 and the first pair of printing cylinders C1, C1' with the related cleaning means p1, P1' according to the prior art diagram of Fig. 1 , it can be seen that the primary unit 1 is arranged in width to work on the webs N of the maximum width usable by the printing machine and which can be provided with means 2 to recover the amount of liquid that this unit 1 supplies laterally to the web N and return it directly to a recovery reservoir 3 with related filter means, when this, as in the example in question, is of a width less than the maximum width that can be used in the printing machine, so that the areas ZC of printing cylinders C at the sides of paper web N will only be reached by a small amount of cleaning liquid with solvent, for example in the order of around 2.5 ml/sec, supplied by the cleaning unit P with which the cylinder is equipped, sufficient to maintain contact between the cloth of the cleaning unit P and the inactive surfaces ZC of the printing cylinder lubricated and clean.
  • solvent for example in the order
  • the primary unit 1 comprises means 4 for controlled feed of the cleaning liquid with solvent to the spray bar or bars thereof, controlled by a processing unit 5, an input 6 of which receives a signal relating to the feed speed of the web N, so that through said means 4 the amount of liquid supplied to the opposite sides of this web N by said first primary unit 1 is automatically adjusted in a manner that is directly proportional to the feed speed of the web N, without exceeding the maximum limits that ensure safe operation of the drying oven that this web N passes through after cooperating with the various printing cylinders.
  • the Italian patent no. 1.375.783 dated 5 January 2007 corresponding to the International Application WO 2008/084361 describes how the cleaning liquid with the solvent can be supplied to one or to both sides of the web N, in a variable amount correlated to the feed speed of the web, by related spray bars of a primary unit 1, each of said bars 1 being divided into several adjacent sections 101, with respective nozzles and in which these sections 101 are fed by one or more respective solenoid valves 7, 107, controlled by said processing unit 5 the input of which receives a signal correlated to the width of the web N used, so that the unit 5 can activate or deactivate in groups said solenoid valves 7, 107 to adapt the active width of the spray bar of the primary unit 1 to the width of the web N inserted into the printing machine.
  • the processing unit 5 can be provided with a further input 9 which receives a signal that informs it of any different distribution of dirt on the printing cylinders, so that by supplying one or both of the solenoid valves 7, 107, with the same or different steps and/or opening times, it is possible to supply variable amounts of solvent to the bar sections 101 selected, to adapt operation of the spray bar or bars of the primary unit 1 to the different feed speeds of the web N and consequently to allow, also through the unit 4, reduction of the amount of solvent that is supplied transversely to the web N in the unit of time, to be able to supply more or less solvent to be destined respectively to more or less dirty areas of the printing cylinders to be cleaned or to implement micro-washing methods.
  • D1 states that satisfactory cleaning results are obtained if the same cleaning cycle is repeated before the cylinders become very soiled, and therefore if the cycle is repeated for short periods (intermittently) as they are only moderately soiled, the cylinders are cleaned rapidly, in limited times, and the length of paper web use to perform the cleaning cycle, which must therefore be discarded, is limited, with consequent advantages in reducing the costs of the cleaning process.
  • the numeral 1 indicates the primary unit for supplying solvent to one or both opposite sides of the web N to be printed that is fed in the direction F and cooperates with the first group of printing cylinders C1, C1' with related cleaning means P1, P1'.
  • the top parts TA of the diagrams indicate the activities of the primary unit 1, while the bottom parts TB indicate the deactivation time of the primary unit 1.
  • the diagram of Fig. 4 is, for example, correlated to the feed speed Vmax of the web N, while the diagrams of Figs. 5 and 6 are correlated to a feed speed of the web N that is respectively half and a quarter of said speed Vmax and in these diagrams the bottom parts TB', TB" are characterized respectively by time that is double and quadruple those of the parts TB of the diagram of Fig. 4 .
  • the supply apparatus can therefore be produced with a simplified solution as shown in Fig. 7 , in which solenoid valves 7 are provided for shutting off the sections 101 of the spray bars 10, 10' of the primary unit 1 connected hydraulically to a simplified unit 104 for feeding cleaning liquid at substantially constant pressure and in which the solenoid valves 7 are electrically connected to the processing unit 5 provided with the three inputs 6, 8 and 9 already mentioned with reference to Fig. 2 , but which now only requires to control the different times of said solenoid valves 7, without it being necessary to adjust other parameters of flow rate and/or pressure in the circuit that feeds the cleaning liquid to the spray bars, as was instead provided for by the prior art.
  • the processing unit 5 can be provided with a supplementary input 11 to be informed of the physical and /or absorbent properties of the web N, to consequently modify the time control of the solenoid valves 7 according to predetermined software.
  • Said steps of supplying the liquid to the opposite sides of the web N to be printed are usually synchronised, as shown in Fig. 3 , so that these sides have opposed lengths in the same conditions, to both of which said amounts Q of liquid with solvent have been applied and opposed lengths of web N to which no liquid with solvent has been applied.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP14173960.7A 2013-06-26 2014-06-25 Procédé et appareil de type simplifié et combiné pour nettoyer les cylindres de machines d'impression rotatives Withdrawn EP2818321A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000331A ITBO20130331A1 (it) 2013-06-26 2013-06-26 Procedimento ed apparato di tipo combinato e semplificato per la pulitura dei cilindri nelle macchine da stampa di tipo continuo

Publications (1)

Publication Number Publication Date
EP2818321A1 true EP2818321A1 (fr) 2014-12-31

Family

ID=48877324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14173960.7A Withdrawn EP2818321A1 (fr) 2013-06-26 2014-06-25 Procédé et appareil de type simplifié et combiné pour nettoyer les cylindres de machines d'impression rotatives

Country Status (2)

Country Link
EP (1) EP2818321A1 (fr)
IT (1) ITBO20130331A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301410A1 (de) * 1993-01-20 1994-07-21 Baldwin Gegenheimer Gmbh Druckmaschinen-Reinigungsvorrichtung
EP0816080A2 (fr) 1996-07-03 1998-01-07 Jimek Ab Procédé et dispositif pour nettoyer un cylindre porte-blanchet dans une machine à imprimer
WO2008084359A1 (fr) * 2007-01-05 2008-07-17 Finelettra International S.A. Procédé et appareil destinés au nettoyage des cylindres de machines d'impression de type continu
WO2008084361A1 (fr) 2007-01-05 2008-07-17 Finelettra International S.A. Appareil destiné au nettoyage de cylindres dans des machines d'impression en continu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301410A1 (de) * 1993-01-20 1994-07-21 Baldwin Gegenheimer Gmbh Druckmaschinen-Reinigungsvorrichtung
EP0816080A2 (fr) 1996-07-03 1998-01-07 Jimek Ab Procédé et dispositif pour nettoyer un cylindre porte-blanchet dans une machine à imprimer
WO2008084359A1 (fr) * 2007-01-05 2008-07-17 Finelettra International S.A. Procédé et appareil destinés au nettoyage des cylindres de machines d'impression de type continu
WO2008084361A1 (fr) 2007-01-05 2008-07-17 Finelettra International S.A. Appareil destiné au nettoyage de cylindres dans des machines d'impression en continu

Also Published As

Publication number Publication date
ITBO20130331A1 (it) 2014-12-27

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