EP0071108B1 - Procédé et dispositif pour appliquer de l'encre et de l'eau à une plaque d'impression - Google Patents

Procédé et dispositif pour appliquer de l'encre et de l'eau à une plaque d'impression Download PDF

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Publication number
EP0071108B1
EP0071108B1 EP19820106394 EP82106394A EP0071108B1 EP 0071108 B1 EP0071108 B1 EP 0071108B1 EP 19820106394 EP19820106394 EP 19820106394 EP 82106394 A EP82106394 A EP 82106394A EP 0071108 B1 EP0071108 B1 EP 0071108B1
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EP
European Patent Office
Prior art keywords
roller
ink
nip
mixture
dampening fluid
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.)
Expired
Application number
EP19820106394
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German (de)
English (en)
Other versions
EP0071108A1 (fr
Inventor
Harold Phillip Dahlgren
James E. Taylor
Dwight W. Peters
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.)
Dahlgren Manufacturing Co Inc
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Dahlgren Manufacturing Co Inc
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Publication date
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Publication of EP0071108A1 publication Critical patent/EP0071108A1/fr
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Publication of EP0071108B1 publication Critical patent/EP0071108B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/36—Inking-rollers serving also to apply ink repellants
    • 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

Definitions

  • the invention relates to a method of applying an emulsified printable mixture of ink and dampening fluid to a lithographic printing plate from a mixture reservoir, whereby a film of emulsified mixture to be delivered to the printing plate is metered at a nip between a rotated transfer roller and a metering member onto the surface of the transfer roller.
  • the invention further relates to a printing apparatus having a printing plate, a form roller engaging the printing plate, a metering roller engaging a transfer roller and forming a nip between the metering roller and the transfer roller for supplying .printing liquid to the form roller, and a reservoir containing a mixture of ink and dampening fluid building a printing liquid.
  • US-A-4211 167 discloses a rod pressed under strong pressure against a soft surface carrying a layer of ink and dampening fluid, the rod forming a barrier only against the dampening fluid while allowing all the residual film of ink remaining on the roller to pass and return to a mass of ink in a reservoir.
  • WO-A-8 001 151 discloses an apparatus which includes a fountain roller dipping into a reservoir consisting of ink, water and further additives, whereby that fountain roller operates as a metering roller and is in direct contact with a form roller, whereby that form roller is in direct contact with the printing plate.
  • the surface of the form roller moving from the nip between the fountain or metering roller and the form roller to the contact or applicator nip between the form roller and the printing plate is only engaged by a single vibrator roller.
  • the present invention provides a solution to problems encountered in separating ink and dampening fluid by permitting the emulsified ink and dampening fluid to be used again. It was discovered that if unused ink and dampening fluid are thoroughly mixed with fresh ink to form a substantially homogeneous mixture, ink and dampening fluid removed from a lithographic printing press equipped with an inker and a dampener can be removed from a form roller to prevent accumulation and remetered for application to the form roller provided the emulsified ink and dampening fluid are not kept in a confined area long enough for the ink and dampening fluid to separate.
  • an object of the present invention to provide an ink removal, circulating and distributing system that meters a substantially homogeneous mixture of ink and dampening fluid to a form roller for use in a lithographic printing system wherein an improved distribution system maintains the homogeneous mixture sufficiently agitated to prevent separation of the ink and dampening fluid.
  • a further object of the invention is to maintain a uniform viscosity consistency of an ink emulsion throughout a printing run.
  • a still further object of the invention is to provide apparatus to remove the ink and dampening fluid from a form roller and to reapply the ink and dampening fluid to the form roller, in combination with a dampener having a hydrophilic roller adapted to deliver a metered film of dampening fluid to the form roller and to remove excess dampening fluid from. the form roller.
  • a method of applying an emulsified printable mixture of ink and dampening fluid to a lithographic printing plate as described above includes the steps of depositing an excess of the emulsified mixture of ink and dampening fluid which has been removed from the form roller after it having engaged the printing plate in an axially central portion of the nip between the transfer roller and the metering member such as that this emulsified mixture flows longitudinally of the nip towards opposite ends of the transfer roller; maintaining the flow of mixture longitudinally of the nip to prevent accumulation of dampening fluid adjacent the nip; causing the mixture to cascade over the opposite ends of the transfer roller into opposite ends of the reservoir to remove the mixture from the nip adjacent opposite ends of the nip; and pumping the mixture from a central portion of the reservoir to the central portion of the nip.
  • a printing apparatus as described above is-characterized by dispensing means for delivering printing liquid to an axially central portion of the nip between the transfer roller and the metering roller; means for removing excess ink and dampening fluid from the form roller after the form roller has engaged the printing plate; mixing means for mixing ink and the excess ink and dampening fluid removed from the form roller into a substantially homogeneous printing fluid; and pump means circulating the homogeneous printing liquid to and from the nip.
  • a printing system 1 is illustrated in FIGS. 1 and 2 which includes an inking system 2, a scraping-off means 26, a reservoir 14, a pump 32 and motor 34, by-pass line 38, a distributor line 20 and nip N' between two adjacent rollers 12 and 13 in pressure indented relation and a suitable . dampener 200.
  • Ink is supplied to nip N' via ink distributor line 20 to the mid-point between the ends of rollers 12 and 13 in an josdant quantity such that the excess flows towards the roller ends and cascades therefrom to be collected and supplied to reservoir 14 by gravity feed.
  • Blended in reservoir 14 with ink, the mixture or emulsion of ink and dampening fluid removed from form roller 90 by roller 94 and scraping-off means 26 is pumped back to distributor line 20 to complete the circuit.
  • By-pass 38 is provided to enable pump 32 to run at a high rate of speed to thoroughly mix and circulate the emulsion further.
  • Pump 32 is preferably a constant displacement auger-type screw pump driven by a variable speed air motor 34. Pump 32 and by-pass 38 provide adequate mixing through circulation to form and maintain a homogeneous mixture of the ink and dampening fluid.
  • the dampener 200 is of the general form roll contact-type disclosed in the U.S. Pat. No. 3,168,037, entitled “Means For Dampening Lithographic Offset Printing Plates" which issued February 2, 1965 to Harold P. Dahlgren. The disclosure of U.S. Pat. No. 3,168,037 is incorporated herein by reference in its entirety for all purposes.
  • the inker generally comprises a form roller 90, ink idler roller 10, ink transfer roller 12, ink metering roller 13, and ink pan 14.
  • Form roller 90, ink idler roller 10 and ink transfer roller 12 are generally supported between side frames (not shown) as disclosed in PCT International Application No. 79/00948 filed June 3, 1980, entitled “Inker For Newspaper Press", the disclosure of which is incorporated herein by reference in its entirety for all purposes.
  • Suitable means are provided, as hereinbefore described, for delivering an abundant supply of ink to the ink metering nip N' between adjacent surfaces of ink metering roller 13 and ink transfer roller 12.
  • a distribution tube 20 discharges a substantially homogeneous printing liquid 22 at the junction between rollers 12 and 13 with the liquid being metered at the ink metering nip N' and carried by the surface of the roller 12 to thereby provide ink at ink transfer nip N.
  • a sufficient flow of liquid 22 is provided at the junction of rollers 12 and 13 to maintain a flow of excess liquid over the ends of rollers 12 and 13 into ink pan 14, as will be hereinafter more fully explained.
  • Idler roller 10 and metering roller 13 are preferably hard and have an exterior surface which may be smooth or textured and which are ink receptive or oleophilic, such as copper or plastic.
  • the surface of ink idler roller 10 and ink metering roller 13 may be either hard or resilient, depending upon the characteristics of the surface of form roller 90. If the form roller 90 has a resilient surface, then the surfaces of the idler roller 10 and metering roller 13 are preferably hard.
  • Transfer roller 12 preferably comprises a hollow tubular sleeve 12a with a resilient cover 12c secured about the outer surface of the sleeve.
  • This cover material of ink transfer roller 12 is selected so as to be oleophilic and the surface may be textured.
  • idler roller 10 ink transfer roller 12 and ink metering roller 13 may be alternately hard and soft.
  • Ink idler roller 10 is preferably positioned in pressure indented relationship with form roller 90, which has a metal tubular core 91 as described in U.S. Pat. No. 4,233, 898.
  • Form roller 90 has a smooth outer cover 96 which may be non-absorbent or absorbent, hard or soft, depending upon the nature of construction of printing plate 112.
  • form roller 90 has a smooth outer cover 96 which may have a resilient non-absorbent surface.
  • Another embodiment of form roller 90 includes a resilient surface and has a molleton type of cover which absorbs the ink and will reject dampening fluid.
  • plate 112 has raised image areas and is constructed of resilient material, form roller 90 could be provided with a hard surface of, for example, copper or a hard thin plastic covering.
  • ink roller 94 preferably a traversing oscillating idler roller with associated scraping off-means 26, is adapted to remove excess ink from areas 128" from ink film 128 on the surface of form roller 90 and transfer some of the ink to depleted areas 128' thereby creating a more uniform film of ink 130 on the surface of roller 90 moving from nip 120 towards nip 106 to be later explained more fully.
  • a second ink roller 95 is positioned between plate cylinder P and dampener 200 to smooth the ink film upon reversal of form roller 90 as will be more hereinafter fully explained.
  • a material conditioning roller 86 preferably an oscillating idler roller, is rotatably supported as disclosed in U.S. Pat. No. 4,233,898. Roller 86, 94 and 95 are mounted in pressure indented relation with form roller 90 each having a surface of preferably similar material to that of form roller90 such that the surface has the same affinity for ink as does the surface of form roller 90.
  • ink film 100 may be slick and calendared.
  • a slick film of ink is not particularly receptive to dampening fluid since the surface tension of the molecules of ink may reject the thin layer of dampening fluid to be applied by dampener 200.
  • Material conditioning roller 86 will receive a portion of the film 100 of ink thus splitting the film 100 of ink and producing a film 100' on roller 86 thus leaving film 100a with a matte finish having microscopic cavities or indentations.
  • the matte surface upon film 100a will readily accept the thin film 204 of dampening fluid.
  • Rollers 86, 94 and 95 are preferably provided with drive means (not shown) to oscillate the rollers in a longitudinal direction.
  • Suitable oscillator drive means are well known to persons skilled in the printing art and further description is not deemed necessary. Rotation is provided through friction contact with adjacent surfaces.
  • Dampener 200 is diagrammatically illustrated in FIG. 2 and comprises a hydrophilic transfer roller 212 and a resilient metering roller 213 mounted in a manner similar to inker 2 as described in U.S. Pat. No. 3,168,037.
  • Metering roller 213 meters dampening fluid 214a from pan 214 onto transfer roller 212 through flooded nip Na.
  • Water film controlled by pressure between rollers 213 and 212 forms a thin layer of dampening fluid 204 which is metered through dampening fluid transfer nip D onto the matte finish of ink film 100a on the surface of form roller 90.
  • Dampener metering roller 213 is driven by a variable speed reversible motor as described in U.S. Pat. No. 4,233,898.
  • Metering roller 13 is rotatably mounted in pressure indented relation with transfer roller 12 and transfer roller 12 is rotatably mounted in pressure indented relation with idler roller 10. The pressure between adjacent roller surfaces is adjusted such that the surface of metering roller 13 and idler roller 10 are actually impressed into the surface of transfer roller 12.
  • transfer roller 12 Since transfer roller 12 has a smooth, oleophilic surface thereon, a portion of the film adheres to the surface of roller 12 to form a film 104, the remaining portion being rotated on the surface of roller 13 back into the excess.
  • a film of ink 104 is distributed on the surface of transfer roller 12 by reason of the rotating, squeezing action between rollers 12 and 13 at their tangent point at ink metering nip N'.
  • the film of ink 104 rides on the surface of transfer roller 12 and comes in contact with ink film 116 on idler roller 10 at ink transfer nip N to form a film of printing ink 104a on idler roller 10.
  • the film of ink 104a rides on the surface of idler roller 10 and comes in contact with uniform film 130 of ink on form roller 90 at the inking nip 106 between idler roller 10 and form roller 90.
  • idler roller 10 may or may not be positively driven. If positively driven, it may be driven at a fixed ratio slower than the surface speed of the adjacent form roll 90. In any event, the surface of idler roller 10 is driven in the same direction as the adjacent surface of form roller 90. Idler roller 10 serves as an intermediate applicator roll between form roller 90 and transfer roller 12.
  • idler roller 10 is impressed into the resilient surface of form roller 90 and transfer roller 12 and that the film of ink 104 has an outer surface 108, which contacts ink film 116, and an inner surface 110 which adheres to the surface of transfer roller 12.
  • the outer surface 108 of film 104 and te outer surface 117 of the film of ink 116 on idler roller 10 are urged together to create a hydraulic connection between rollers 12 and 10 as they rotate in close relationship, but there is no physical contact between the roller surfaces. It is an important fact to note that the relatively thick film of ink 104 permits rollers 12 and 10 to be rotated at different surface speeds.
  • the form roller 90 which is normally press driven and rotated at the same surface speed as the printing plate 112 is rotated at a greater surface speed than the surface speed of roller 12.
  • the amount of ink applied to plate 112 may be regulated.
  • the ink film 104 is presented at the inking nip N at a faster rate and more ink is transferred by the surface roller 90 to lithographic printing plate 112, and the opposite is true, if the surface speed of roller 12 is decreased.
  • the film of ink 104 permits the rollers 12 and 10 to be rotated at different speeds in sliding relationship because the film of ink 104 actually provides lubrication which permits slippage between adjacent surfaces of rollers 12 and 10 without frictional deterioration.
  • the ink film 104 is calendared, smoothed out, metered and distributed by shearing the ink between adjacent surfaces of rollers 12 and the film 116 on idler roller 10, to create a printing liquid film 104a.
  • the thickness of printing liquid film 104a is controlled by the relative pressures between metering roller 13 and transfer roller 12, and idler roller 10 and the relative speeds of rollers 12 and 10.
  • Transfer roller 12 preferably is driven at a surface speed which is slower than the surface speed of form roller 90. For example, if a printing press has paper travelling therethrough at a surface speed of about 275 m/min, the surfaces of printing plate 112 and form roller 90 will ordinarily have the same surface speed, while the surface speed of transfer roller 12 would preferably be less than 10% thereof.
  • Films 104 and 116 will be combined at inking nip N and will split when sheared as rollers 12 and 10 rotate away from inking transfer nip N.
  • the fresh film 104a of printing ink adheres to the surface of idler roller 10.
  • Ink rejected by idler roller 10 forms a feedback film 104b of ink which may be slightly irregular.
  • Film 104b adheres to the surface of transfer roller 12 and is conveyed back to the ink metering nip N' to be remetered.
  • Feedback film 104b may not be uniform because the starved areas on form roller 90 and consequently idler roll 10, from which ink was removed by image areas on plate 112, removed different quantities of ink from film 104 in order to form film 100 on form roller 90.
  • Film 128 has starved areas 128' from ink removed by image areas 122 on plate 112, thus rendering film 128 irregular.
  • ink film 130 generated at nip X is quite uniform and consequently films 100 and 116 and 104a and 104b resulting therefrom will be substantially uniform as explained later herein.
  • the lithographic printing plate 112 has hydrophilic or water liking non-image areas 121 and oleophilic, ink receptive, image areas 122 formed on the surface thereof. If printing plate 112 is provided with raised image areas, the dampener 200 would not be required to prevent transfer of ink to non-image areas.
  • the combined film 216 and 100a is split to form thin films 125 of ink and dampening fluid over oleophilic surfaces 122 on the printing plate.
  • the layer 216 of dampening fluid is carried on and in the film 100a of printing liquid and is also distributed to form a thin film 226 of dampening fluid over hydrophilic areas 121 of the printing plate.
  • dampening fluid remains on the surface of form roller 90 which is moving away from nip 120 towards nip X, but such dampening fluid as does remain thereon is transfered with the excess liquid film 128 to become liquid film 130a on the ink roller 94.
  • a doctor blade 26 has one of its edges supported by holder 28 and a edge engaging roller 94 for removing as much of the excess liquid from the roller as possible thereby forming a uniform and thin film 130b on roller 94.
  • the removed dampening fluid and ink (liquid) is gravity fed onto a deflector shield 30 which in turn permits gravity feed into a liquid reservoir 14a in ink pan 14.
  • the non-uniform excess liquid film 128 remaining on form roller 90 is combined with the ultra thin uniform film 130b on ink roller 94 and actually “printed” onto roller 94.
  • the excess ink and dampening fluid 128 remaining on the surface of form roller 90 after printing to the lithographic printing plate 112, is virtually entirely removed therefrom by transferring or "printing" the irregular film 128 to the ultra-thin doctored film 130b on the surface of idler roller 94.
  • the ultra-thin and uniformly doctored film 130b is formed from a reservoir 23 of accumulated excess 130a.
  • Idler roller 94 now functions as an endless doctoring surface which allows the film 128" to be completely transferred to the surface of roller 94 just as ink film 100a was initially transferred or "printed” to the plate 112.
  • the layer of dampening fluid 216 is applied in substantially the same manner as the ink film 100 is applied.
  • An excess of dampening fluid 214a is supplied to bead 201 and metered at Na between rollers 213 and 212 to form a film 204 of dampening fluid which is applied to ink film 100a on form roller-90 at nip-D.
  • the film 204 of dampening fluid on hydrophilic dampening fluid transfer roller 212 and dampening fluid on film 100a combine at nip D to form film 216 on form roller 90.
  • the film 217 of excess dampening fluid is removed from form roller 90 and is returned to bead 201 to be remetered at nip Na.
  • the improved apparatus for applying ink to printing systems offers control of metering at ink metering nip N and N' to provide a film 100 of ink of precisely controlled thickness by adjusting pressure between rollers 10, 12 and 13, and further by controlling surface speeds of rollers, 12 and 10 relative to each other.
  • the rate at which the metered film 104 of ink is offered to film 116 on idler roller 10 at inking nip N and also the hydraulic force of obtaining the desired film split are controlled.
  • the doctor blade 26 engages roller 94to remove as much as possible of the ink and dampening fluid in film 128.
  • roller 94 engages roller 90 a thinner uniform thickness of printing liquid 130 moves into nip 106 and thereby assists in preventing an accumulation on idler roller 10.
  • ink pan 14 has a central drain outlet 14b located in the center of pan 14, which communicates through appropriate pipes 14c and pump 32, driven by motor 34, to distributor tube 20 to regulate the flow of printing liquid onto metering roller 13 at 22.
  • the provision of the bottom in pan 14 with sections sloping downwardly toward the central opening assures constant circulation of ink 14a in the pan.
  • the ink flows from tube 20 into the center of nip N' forming excess 22 and then flows outwardly along nip N' to cascade over the ends of metering roller 13 and ransfer roller 12 into opposite ends of pan 14.
  • a bypass line 38 is branched from distributor tube 20 to discharge printing liquid into ink pan 14.
  • the pump 32 delivered about 7.5 liter per minute of homogeneous mixture of ink and dampening fluid through line 38 to reservoir 14 and about 11 liter per minute through distributor tube 20 to the nip N'.
  • the pump capacity was about 19 liter per minute which was sufficient to maintain a homogeneous mixture of ink and dampening fluid.
  • the flow of about 7.5 liter was sufficient to prevent separation of dampening fluid from ink in nip N' or to remove any dampening fluid from nip N' that was separated from the ink.
  • dampening fluid was not present in nip N' in a form which would displace ink and cause stripping.
  • an ink supply tank 40 is provided in the circulating system with a pump 42 having an inlet in communication with the fresh ink and an outlet in fluid communication through line 41 with a float valve 44 which permits communication with distribution tube 20.
  • Float valve 44 is controlled by a float 46 disposed within ink pan 14 to add fresh ink to liquid 14a when the level of liquid drops below a predetermined quantity. Since float valve 44 is closed except when the level of ink in pan 14 is low, a return line 41a a having a valve 41b therein extends between ink supply line 41 and ink container 40 to permit circulation of ink from pump 42 through supply line 41 and return line 41 a when float valve 44 is closed.
  • this circulation system is operable on a complete printing couple as shown in FIG. 3:
  • the first printing unit When employed in forward printing couples, the first printing unit is operable as previously described in relation to the embodiment of the invention shown in FIG. 1.
  • a doctor blade 26 supported by holder 28' is disposed to engage roller 94 to remove a portion of the ink and dampening fluid film carried thereon. This portion of ink is then gravity fed through deflector shield 30' into ink pan 14'.
  • Pan 14' includes an outlet 14b' which is in fluid communication through appropriate piping with pump 32' powered by motor 34' which discharges into distributor tube 20'.
  • a control valve 36' is provided to control the flow of homogeneously mixed printing liquid 22' onto meter roller 13 for application to form roller 90 and from there onto printing cylinder P.
  • Pump 32' is continuously supplying printing liquid through distributor tube 20' and the printing liquid is then either discharged onto metering roller 13' or through bypass tube 38' to thereby provide a continuous circulation of the printing liquid which creates the homogeneous mixture of ink and dampening fluid for discharge as the printing liquid 22'.
  • doctor blade 26' is disengaged from roller 94 and a doctor blade 26a is supported by holder 28a for removing a portion of the ink and dampening fluid carried by roller 95.
  • This removed portion of ink and dampening fluid is gravity fed to an ink collection pan 14" which has a discharge outlet 14b" in fluid communication through appropriate piping with discharge outlet 14b' and the inlet of pump 32'.
  • a float control valve 44' is provided with an inlet in fluid communication with the outlet of the pump 42 driven by motor 43 and an outlet in communication with distributor tube 20' so that fresh ink may be added to the system when necessary.
  • Valve 44' is controlled by a float 46' mounted within ink pan 14' so that when the level of liquid 14a' drops below a predetermined amount, fresh ink is supplied to the system. This arrangement permits the adding of fresh ink to the system for both forward and reverse printing by use of a single float control valve controlling the addition of fresh ink.
  • roller 10 when reversing a printing couple the direction of rotation of roller 90 and, therefore, roller 10 is reversed although the directions of rotation of rollers 13 and 12 may remain the same.
  • FIG. 4 A second embodiment for multiple printing couples 1 and 2 is shown in FIG. 4.
  • This embodiment is similar to the embodiment shown in FIG. 3, except that a single pump 50 driven by motor 52 has its inlet in fluid communication through conduits or similar piping with the outlets of pans 14, 14' and 14".
  • the outlet of pump 50 is in fluid communication through conduits or similar piping through a mixing tank 54 which receives, mixes and stores a quantity of the printing liquid.
  • Stirring apparatus 56 having paddles 58 disposed within the printing fluid 55 continuously mixes the fluid to ensure a homogeneous mixture of ink and dampening fluid for the printing liquid used in the printing system.
  • a quantity of fresh ink is stored within tank 60 which includes an outlet 62 in fluid communication through appropriate piping to a float valve 64 disposed in fluid communication within tank 54 to add fresh ink to the printing liquid 55 when needed.
  • a second pump 66 driven by motor 68 includes an inlet in fluid communication through appropriate piping with the interior of tank 54 and outlet in fluid communication through appropriate discharge tubes 20 and 20'.
  • pump 66 has a discharge sufficient to provide the required amount of flow of printing liquid to metering rollers 13 and 13' with some flow through bypass tubes 38 and 38' into ink pans 14 and 14', respectively.
  • this embodiment in addition to a single pump moving the homogeneous printing liquid to both metering rollers 13 and 13', includes a separate and distinct mixing apparatus to ensure that the ink and dampening fluid is continuously mixed to provide a homogeneous mixture of printing liquid 55.
  • the third embodiment of the invention illustrated in FIG. 5 is preferred for multiple printing units which incorporates the system and described in relation to the second embodiment illustrated in FIG. 4.
  • printing couples 1-6 are illustrated with the first printing unit being capable of forward and reverse printing. It will be noted that couple 2 is illustrated with blade 26a positioned for reverse printing.
  • a single tank 54' is provided for receiving a quantity of printing liquid 55' therein.
  • Mixing apparatus 58' is then used for continuously mixing the ink and dampening fluid contained within the mixing tank 54' to ensure a homogeneous mix of printing liquid from removed ink and dampening fluid from a multiple of printing units.
  • a remote supply tank 60' is provided for supporting a quantity of fresh ink and an outlet 62' is in fluid communication through appropriate piping to a float valve 64' disposed within tank 54' for adding the fresh ink into printing liquid 55' when necessary.
  • Each printing unit shown in FIG. 5 is then in fluid communication through appropriate piping to return and supply pumps in a manner similar to that previously described in relation to the embodiment illustrated in FIG. 4.
  • varying combinations of printing having varying mixes of excess ink and dampening fluid; namely, couples running forward and reverse, couples running half-webs and those having ordinary and extraordinary printing formats, are joined together by removal of excess ink and dampening fluid from respective form rolls of each printing couple, circulated and mixed with fresh ink to form a honogeneous mixture of - printing liquid and then distributed back to each printing unit.
  • filters could easily . be added to this system for removal of foreign particles of dried ink, dust paper lint, etc. which if allowed to accumulate could cause problems in addition to those primarily solved by this invention.
  • the system also readily provides that ink additives and ink heating and/or cooling may be incorporated for any purpose required, primarily at tanks 54 or 54'.

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

Claims (9)

1. Procédé d'application d'un mélange imprimable, émulsifié, d'encre et de fluide de mouillage sur une plaque d'impression lithographique (P), provenant d'un réservoir de mélange (14), selon lequel un film de mélange émulsifié à livrer à la plaque d'impression (P) est amené, à la ligne de contact (N') entre un rouleau de transfert rotatif (12) et un organe d'alimentation régulière (13), sur la surface du rouleau de transfert (12), caractérisé par le fait qu'on dépose un excès du mélange émulsifié d'encre et de fluide de mouillage, qui a été enlevé d'un rouleau encreur (90) après que celui-ci a été en contact avec la plaque d'impression (P), dans une position centrale axialement de la ligne de contact (N') entre le rouleau de transfert (12) et l'organe d'alimentation régulière (13) de telle sorte que le mélange émulsifié s'écoule dans le sens longitudinal de la ligne de contact (N') vers les extrémités opposées du rouleau de transfert (12); on maintient l'écoulement du mélange dans le sens longitudinal de la ligne de contact (N') pour empêcher l'accumulation de fluide de mouillage au voisinage de la ligne de contact (N'); on fait s'échapper le mélange en cascade par dessus les extrémités opposées du rouleau de transfert (12) dans des extrémités opposées du réservoir (14) pour écarter le mélange de la ligne de contact (N') au voisinage des extrémités opposées de la ligne de contact (N'), et on renvoie à la pompe le mélange d'une portion centrale (14c) du réservoir (14) à la portion centrale de la ligne de contact (N').
2. Procédé selon la revendication 1, caractérisé par le fait qu'on ajoute portion d'un second mélange émulsifié d'encre et fluide de mouillage qui n'a pas été transférée à la plaque d'impression lithographique (P) avec le premier mélange et on mélange le premier mélange avec le second mélange pour former un mélange homogène ayant un pourcentage de fluide de mouillage plus faible que le second mélange émulsifié.
3. Procédé selon les revendications 1 et 2, caractérisé par le fait qu'on envoie à la pompe une portion du mélange par un premier conduit (20) à la portion centrale de la ligne de contact (N') et on envoie à la pompe une portion du mélange dans le réservoir (14) de façon que le mélange soit enlevé du réservoir (14) à une vitesse plus rapide qu'il n'a été déposé dans la partie centrale de la ligne de contact (N').
4. Procédé selon la revendication 3, caractérisé par le fait qu'on alimente en encre fraîche le reservoir (14) pour recompléter le mélange appliqué à la plaque d'impression lithographique (P).
5. Procédé selon l'une des revendications précédentes, caractérisé par le fait qu'on prélève des mélanges d'une portion centrale (14c) d'une pluralité de réservoirs (14), on réunit ces mélanges pour former un mélange homogène et on envoie à la pompe le mélange homogène à une portion centrale d'une pluralité de lignes de contact (N').
6. Appareil d'impression comprenant une plaque d'impression (P), un rouleau encreur (90) en contact avec la plaque d'impression (P), un rouleau d'alimentation régulière (13) en contact avec un rouleau de transfert (12) et formant une ligne de contact (N') entre le rouleau d'alimentation (13) et le rouleau de transfert (12) pour fournir du liquide d'impression au rouleau encreur (90) et un réservoir (14) contenant un mélange d'encre et de fluide de mouillage formant un liquide d'impression, caractérisé par le fait qu'il comprend, en outre, des moyens de distribution (20) pour amener du liquide d'impression à une portion axialement centrale de la ligne de contact (N') entre le rouleau de transfert (12) et le rouleau d'alimentation (13); des moyens (26, 94) pour éliminer l'encre en excès (128) et le fluide de mouillage du rouleau encreur (90) après que celui-ci est venu en contact avec la. plaque d'impression (P); des moyens mélangeurs (34, 32) pour mélanger de l'encre et l'encre en excès (128) et du fluide de mouillage éliminés du rouleau encreur (90) pour en faire un fluide d'impression sensiblement homogène; et des moyens de pompage (32) pour faire circuler le liquide d'impression homogène en direction et en provenance de la ligne de contact (N').
7. Appareil d'impression selon la revendication 6, caractérisé par le fait que les moyens d'élimination (26, 94) comprennent une racle (26) et des moyens pour diriger le courant d'encre et de fluide de mouillage éliminés vers les moyens mélangeurs.
8. Appareil d'impression selon l'une des revendications 6 ou 7, caractérisé par le fait qu'il comporte, en outre, un rouleau hydrophile (212) fournissant un film de fluide de mouillage au rouleau encreur (90) et enlevant de ce rouleau le fluide de mouillage en excès.
9. Appareil d'impression selon la revendication 8, caractérisé par le fait qu'il comporte, en outre, un rouleau d'alimentation régulière de fluide de mouillage (213) en relation de pression voulue avec le rouleau hydrophile (212) pour former une ligne de contact d'alimentation régulière de fluide de mouillage (Na), l'excès de fluide de mouillage enlevée du rouleau encreur (90) par le rouleau hydrophile (212) étant amené par le rouleau hydrophile (212) à la ligne de contact d'alimentation de fluide de mouillage (Na) et des moyens pour maintenir une amenée abondante de fluide de mouillage au voisinage immédiat de la ligne de contact d'alimentation de fluide de mouillage (Na),
EP19820106394 1981-07-31 1982-07-16 Procédé et dispositif pour appliquer de l'encre et de l'eau à une plaque d'impression Expired EP0071108B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28874481A 1981-07-31 1981-07-31
US288744 1981-07-31

Publications (2)

Publication Number Publication Date
EP0071108A1 EP0071108A1 (fr) 1983-02-09
EP0071108B1 true EP0071108B1 (fr) 1987-06-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820106394 Expired EP0071108B1 (fr) 1981-07-31 1982-07-16 Procédé et dispositif pour appliquer de l'encre et de l'eau à une plaque d'impression

Country Status (5)

Country Link
EP (1) EP0071108B1 (fr)
JP (1) JPS5865664A (fr)
CA (1) CA1224965A (fr)
DD (1) DD202266A5 (fr)
DE (2) DE3276469D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149841A2 (fr) * 1984-01-20 1985-07-31 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour encrer le cliché d'un cylindre porte-plaque d'une machine à imprimer rotative
EP0182325A2 (fr) * 1984-11-23 1986-05-28 Albert-Frankenthal AG Dispositif d'encrage
FR2590205A1 (fr) * 1985-11-21 1987-05-22 Seailles Tison Sa Dispositif pour l'encrage d'une forme d'impression rotative a partir d'une masse compacte d'encre a viscosite elevee
EP0282754A2 (fr) * 1987-03-14 1988-09-21 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif d'encrage et de mouillage pour machine à imprimer offset
FR2650535A1 (fr) * 1989-08-02 1991-02-08 Corse Louis Dispositif d'elimination de l'eau en exces associe a un dispositif d'encrage et de mouillage d'une imprimeuse rotative offset
WO1999011459A1 (fr) * 1997-09-03 1999-03-11 Goss Graphic Systems, Inc. Appareil et procede d'impression lithographique au moyen d'un mecanisme de precision d'alimentation en encre a l'eau
US5927200A (en) * 1997-09-02 1999-07-27 Goss Graphic Systems, Inc. High-shear liquid mixing and dispersing apparatus
EP1157836A2 (fr) * 1996-01-11 2001-11-28 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif d'alimentation en encre pour une machine d'impression et grattoir d'encre

Families Citing this family (13)

* Cited by examiner, † Cited by third party
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JPS59120144U (ja) * 1983-01-31 1984-08-13 三菱重工業株式会社 インキ供給装置
JPS60107349A (ja) * 1983-11-16 1985-06-12 Tokyo Kikai Seisakusho:Kk 平版輪転印刷機におけるインキ供給装置
JPS60109841A (ja) * 1983-11-18 1985-06-15 Tokyo Kikai Seisakusho:Kk 平版輪転印刷機におけるインキ濃度調整供給装置
JPS6091433U (ja) * 1983-11-30 1985-06-22 東芝機械株式会社 グラビア輪転印刷機のインキ供給装置
JPS6110458A (ja) * 1984-06-25 1986-01-17 Takeda Chem Ind Ltd 医薬品錠剤の印刷機におけるインク供給循環装置
JPS6184248A (ja) * 1984-10-02 1986-04-28 Tekunoroole Kk オフセツト印刷機におけるインキング方法
JPH0517243Y2 (fr) * 1984-10-30 1993-05-10
JPH0517242Y2 (fr) * 1984-10-30 1993-05-10
JPH0357491Y2 (fr) * 1985-03-29 1991-12-27
JPS63108735U (fr) * 1987-01-06 1988-07-13
DE102006024788A1 (de) * 2006-05-27 2007-11-29 Man Roland Druckmaschinen Ag Druckmaschine
CN114522431B (zh) * 2022-03-18 2022-12-13 濮阳市欧亚化工科技有限公司 一种液体物料结晶机
CN115257174B (zh) * 2022-07-02 2023-09-29 深圳市粤之彩印刷有限公司 一种防止墨水固化的数字印刷机

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Publication number Priority date Publication date Assignee Title
FR1341701A (fr) * 1962-09-21 1963-11-02 Etudes De Machines Speciales Procédé et dispositif d'encrage pour machines d'impression
US3709147A (en) * 1970-12-03 1973-01-09 W Granger Ink transfer cylinder mounting with adjustable drive clutch
CH583097A5 (fr) * 1975-05-05 1976-12-31 Wifag Maschf
FR2392820A1 (fr) * 1977-06-03 1978-12-29 Martin Sa Perfectionnement au circuit de retour d'encre d'une imprimeuse flexographique
US4237785A (en) * 1978-04-18 1980-12-09 Dahlgren Harold P Inker for applying newsprint type ink
JPS55501136A (fr) * 1978-12-11 1980-12-18

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0149841A2 (fr) * 1984-01-20 1985-07-31 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour encrer le cliché d'un cylindre porte-plaque d'une machine à imprimer rotative
EP0149841A3 (fr) * 1984-01-20 1986-02-12 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et dispositif pour encrer le cliché d'un cylindre porte-plaque d'une machine à imprimer rotative
EP0182325A2 (fr) * 1984-11-23 1986-05-28 Albert-Frankenthal AG Dispositif d'encrage
EP0182325A3 (fr) * 1984-11-23 1987-10-28 Albert-Frankenthal AG Dispositif d'encrage
FR2590205A1 (fr) * 1985-11-21 1987-05-22 Seailles Tison Sa Dispositif pour l'encrage d'une forme d'impression rotative a partir d'une masse compacte d'encre a viscosite elevee
EP0225253A1 (fr) * 1985-11-21 1987-06-10 Seailles Et Tison Sa. Dispositif pour l'encrage d'une forme d'impression rotative à partir d'une masse compacte d'encre à viscosité élevée
EP0282754A2 (fr) * 1987-03-14 1988-09-21 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif d'encrage et de mouillage pour machine à imprimer offset
EP0282754A3 (fr) * 1987-03-14 1990-01-31 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif d'encrage et de mouillage pour machine à imprimer offset
FR2650535A1 (fr) * 1989-08-02 1991-02-08 Corse Louis Dispositif d'elimination de l'eau en exces associe a un dispositif d'encrage et de mouillage d'une imprimeuse rotative offset
EP1157836A2 (fr) * 1996-01-11 2001-11-28 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif d'alimentation en encre pour une machine d'impression et grattoir d'encre
US5927200A (en) * 1997-09-02 1999-07-27 Goss Graphic Systems, Inc. High-shear liquid mixing and dispersing apparatus
WO1999011459A1 (fr) * 1997-09-03 1999-03-11 Goss Graphic Systems, Inc. Appareil et procede d'impression lithographique au moyen d'un mecanisme de precision d'alimentation en encre a l'eau

Also Published As

Publication number Publication date
DD202266A5 (de) 1983-09-07
CA1224965A (fr) 1987-08-04
DE3276469D1 (en) 1987-07-09
JPS5865664A (ja) 1983-04-19
EP0071108A1 (fr) 1983-02-09
DE3227793A1 (de) 1983-02-17

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