EP0109725B1 - Appareil d'essai d'encres d'impression - Google Patents

Appareil d'essai d'encres d'impression Download PDF

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Publication number
EP0109725B1
EP0109725B1 EP83303166A EP83303166A EP0109725B1 EP 0109725 B1 EP0109725 B1 EP 0109725B1 EP 83303166 A EP83303166 A EP 83303166A EP 83303166 A EP83303166 A EP 83303166A EP 0109725 B1 EP0109725 B1 EP 0109725B1
Authority
EP
European Patent Office
Prior art keywords
roller
ink
rollers
engraved
sheet
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
EP83303166A
Other languages
German (de)
English (en)
Other versions
EP0109725A2 (fr
EP0109725A3 (en
Inventor
Roman Robert Kerchiss
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.)
R K Chemical Co Ltd
Original Assignee
R K Chemical 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 R K Chemical Co Ltd filed Critical R K Chemical Co Ltd
Priority to AT83303166T priority Critical patent/ATE30400T1/de
Publication of EP0109725A2 publication Critical patent/EP0109725A2/fr
Publication of EP0109725A3 publication Critical patent/EP0109725A3/en
Application granted granted Critical
Publication of EP0109725B1 publication Critical patent/EP0109725B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/04—Rotary intaglio printing presses specially adapted for proof printing

Definitions

  • This invention concerns a printing ink proofer and an improved method of proofing an ink or like materials.
  • 'ink' is intended to cover any liquid or fluid or paint or paste-like material employed in a coating or printing process.
  • a method of preparing a proof or sample of an ink (as herein defined) as a preliminary to its being employed in a printing or coating process to enable its colour and coating capability to be determined comprises the steps of:-
  • the resulting coating is found to be readily reproducible to a high level of accuracy by merely allowing the two rollers to continue to rotate together and re-establish a position of inking equilibrium before inserting another sample of sheet material therebetween.
  • a length of the sample of sheet material is selected so as to be greater than the circumference of the transfer roller so that the sheet material will still be located in the nip after a complete revolution of the two rollers thereby preventing re-inking during the second revolution.
  • the ink available for coating the sheet material is that remaining in the depressions after the first pass of the sheet material.
  • the doctor blade is adjustable in both proximity and angle of inclination to the surface of the engraved roller.
  • the angle between the plane of the blade and the normal to the roller surface at the point of contact between the blade and the roller surface is in the range 70°-85°.
  • Preferably force is applied to the hingeing frame to urge the first roller into contact with the second roller with the desired pressure therebetween.
  • the force may be obtained from one or more air cylinders.
  • a number of differently engraved rollers may be provided and the appropriate one is selected according to the technique which is to be simulated.
  • first roller Although reference has so far only been made to a single first roller, it is to be understood that the method is applicable to apparatus in which there is more than one first roller and in which the inking surfaces of the two or more first rollers are separate one from the other by virtue of grooves provided in the surface of the rollers if not actual axially spacing of the rollers along a shaft.
  • the invention thus allows two or more different colours of ink or different types of ink or different shades of ink to be applied to different ones of the first rollers and for two proofing coatings to be laid down on the sheet material during a single pass between the rollers. This is of particular advantage where a direct comparison under the same conditions is required between one ink and another.
  • the method also allows for comparison of an unknown ink with known inks.
  • the method is particularly applicable to thick paste-like inks and relies for its success on the fact that the doctor blade can be set to clean the engraved roller just before the latter is due to engage the resilient roller and form the nip therebetween and a sheet of paper or similar sheet material introduced into the nip will therefore only have ink applied to that surface of the sheet material facing the resilient roller.
  • the pressure between the rollers is adjusted so that this desirable result is in practice normally obtained.
  • apparatus for performing the method of the invention comprises:
  • any number of separate inking surfaces may be provided by an appropriate number of subdivisions of the cylindrical surface of a single resiliently deformable roller or by means of a corresponding number of separate rollers mounted on a single shaft.
  • sheet feeding and guide means is located at the input to the nip.
  • Preferably means for indicating the speed of rotation of the engraved roller is provided.
  • a tachometer is employed or alternatively a shaft encoder and electronic pulse counter and display are provided.
  • rollers after use typically in the form of a solvent both with or without solvent applicator roller and transfer rollers.
  • the engraving of the first roller is typically such as to provide between 40 and 160, typically 120, cavities per cm (between 100 and 400, typically 300, cavities per inch) in both axial and circumferential directions of measurement around the first roller, i.e. typically 14,000 cavities per square cm of surface (i.e. typically 90,000 cavities per square inch of surface).
  • the cavities are 6/10 of a thousandth of an inch, i.e. approximately 14 microns, deep, but deeper or shallower cavities may be employed in the range 42 to 420 microns (0.2 to 2.00 thousandths of an inch).
  • the engraved roller is a so-called Anilox roller.
  • each second roller is of natural or synthetic rubber material or a plastics material such as polyurethane or a composite of rubber and plastics material.
  • the second rollers are mounted in a hingeing frame and are movable from an elevated position clear of the engraved roller, into a lower position in contact with the engraved roller.
  • the drive means for rotating the engraved roller is conveniently an air motor, and speed control is achieved by controlling the volume of air available to the air motor.
  • doctor blade is formed from a blade some five thousandths of a cm (some two thousandths of an inch) thick and a thicker rigid backing plate, and the two are sandwiched in a chuck, itself mounted for movement relative to the engraved roller.
  • both the resilient rollers and the engraved roller are mounted on shafts which are adapted to be readily inserted into and removed from, bearing assemblies and driving means is provided at least at one end for engaging one of the shafts and rotating same, so that different rollers can be substituted at will.
  • an air motor for driving the engraved roller shaft through reduction gearing so that the final speed of rotation of the shaft is of the order of 100 revolutions per minute.
  • the motor will rotate at a speed of around 3000 rpm under no-load, reducing to approximately 1500 rpm under load and the reduction gearing (or gearbox) has a ratio of 18: 1.
  • the method of applying the ink to the rollers is most conveniently attained using a spatula or the like and simply positioning a suitably sized blob of ink on to the surface of the roller to which the ink is to be applied. Running the rollers together and using the doctor blade will cause the ink to spread out and form an even film over the surface of the resiliently deformable roller to which the ink has been applied after equilibrium has been established.
  • ink applicator means may be provided for applying ink from a suitable reservoir or container to the cylindrical surface of the roller to which the ink is to be applied.
  • the ink applicator may in fact form part of or be associated with a cleaning device for cleaning the roller and removing therefrom all trace of the ink film applied thereto and to this end the ink applicator may be on one side and the ink remover on the other side of a rocking member which can be tilted so that either one or the other engages the roller.
  • a printing tester or proofing press is shown in the drawings as comprising a baseplate 10 carrying supports 12 and 14 for an engraved roller 16 carried by a shaft 18 which is rotatably received in half bearings at 20 and 22 and includes a drive take-up pin 24 which is engaged by a driving pin 26 extending off centre from a rotating plate 28 comprising the output of a gearbox 30.
  • the supports 12 and 14 include two elevated sections 32 and 34 within which are held captive the ends of a support shaft 36 on which are rigidly mounted two radius arms 38 and 40 which carry between their ends a shaft 42 on which is rotatable a rubber roller 44 serving as a transfer roller for co-operating with the engraved roller 16 which is longer than the first roller 44.
  • the roller 44 includes a circular central annular groove 43 to define two inking surfaces 45 and 47.
  • the roller 44 is movable into engagement with the roller 16 by rotation of the shaft 36 and to this end an arm 46 is rigidly attached to one end of the shaft 36 and as shown in Figure 2, is acted on at its lower end by a pneumatic ram 48 the piston of which is movable outwardly to rotate shaft 36 clockwise as shown in Figure 2.
  • the retracted position is shown at 46'.
  • a doctor blade is movable relative to a support 54 by screw adjusters 56. Angle as well as spacing from the cylinder 16 is adjustable.
  • An air motor 58 is mounted within the gearbox housing 30 as shown in Figure 2, and gears (not shown in detail) transmit drive therefrom to the shaft 18 as described.
  • a control panel 60 is provided with an ON-OFF switch 62, motor speed control 64, UP-DOWN switch 66 and speed of rotation indicator 68.
  • the speed indicator 68 is an LED display device for displaying digits indicating the rotational speed in RPM and an electronic revolution counting device is provided with a shaft encoder (not shown) on the shaft 18.
  • Figure 3 shows the nip between the two rollers 16 and 44 between which a sheet of paper or the like is to be introduced, to obtain the proofing inking.
  • Figure 4 shows inter alia meshing gears 72, 74 in the gearbox and illustrates the roller 44 in its lowered position particularly overlying the roller 16.
  • ink is applied to the inking surface 45 and/or 47 of the inking roller 44 and the latter is lowered on to the engraved roller 16.
  • Mutual inking occurs with effective removal of the surplus ink from the surface of the roller 16 by means of the doctor blade and eventually equilibrium is reached in which a film of ink exists around the surfaces 45 and 47 of the roller 44 and the surface of the roller 16 is effectively free of ink, the latter being trapped in the cavities in the surface of the roller 16 formed by the engraving of the roller.
  • a sheet of paper or like sheet material can be introduced into the nip between the rollers 44 and 16 and a coating of ink will be applied from the inking surfaces 45 and 47 (if both have been inked) on to the surface of the sheet material which cooperates with the inking surfaces whilst little or no ink is applied to the underside of the paper from the engraved roller because of the action of the doctor blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Coating Apparatus (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (10)

1. Une méthode de préparation d'une épreuve ou d'un échantillon d'une encre (cette expression désigne tout liquide ou fluide ou peinture ou matière de consistance pâteuse- employé(e) au cours d'une opération de revêtement ou d'impression), en tant qu'opération préliminaire à son emploi au cours d'une opération d'impression ou de revêtement destinée à permettre la détermination de sa couleur et de sa capacité de revêtement, comprenant les phases suivantes:
a. application d'une certain quantité d'encre sur un premier rouleau (44) constitué d'un matériau déformable d'une manière résiliente;
b. mise du premier rouleau en contact avec und second rouleau (16) plus long axialement que le premier rouleau et gravé de manière à y former un grand nombre de dépressions microscopiques dans lesquelles l'encre peut se trouver "piégée";
c. distribution uniforme de l'encre sur la partie de la longueur axiale du deuxième rouleau gravé, qui correspond à la longueur axiale du premier rouleau au moyen de ce qu'on appelle un couteau-racleur (52) réglé de manière à nettoyer par essuyage la surface du rouleau gravé en ne laissant que l'encre se trouvant dans les dépressions;
d. commande et réglage de la pression entre les deux rouleaux de manière à provoquer en premier le transfert de l'encre se trouvant dans les dépressions, sur la surface du second rouleau, jusqu'à ce qu'un équilibre soit atteint;
e. introduction dans le resserrement entre les deux rouleaux d'un échantillon de feuille qui soit identique ou semblable à la feuille sur laquelle l'encre doit être appliquée au cours d'une opération d'impression subséquente et application de l'encre se trouvant à la surface du premier rouleau déformable de manière résilient sous forme d'un revêtement sur ladite feuille.
2. Une méthode telle que revendiquée dans la revendication 1, caractérisé par le fait que le couteau-racleur est réglé de telle sorte que l'angle entre le plan de la lame et la perpendiculaire à la surface du rouleau au point de contact entre ladite lame et ladite surface du rouleau, soit de l'ordre de 70-85°.
3. Un appareillage permettant de mettre en oeuvre la méthode exposée dans la revendication 1, comprenant:
a. un rouleau gravé (16) présentant sur sa surface un grand nombre de dépressions microscopiques;
b. un rouleau (44) constitué d'un matériau déformable de manière résiliente, monté pour permettre la rotation autour d'un axe parallèle à l'axe de rotation du rouleau gravé et déplaçable sous l'effet d'une pression pour être mis en contact avec le rouleau gravé et être éloigné de ce dernier suivant nécessité;
c. un couteau racleur (52) monté de manière à pouvoir être réglé par rapport au rouleau gravé afin de coopérer avec ledit rouleau pour enlever l'encre en surplus de la surface dudit rouleau lorsqu'il est en contact de roulement avec le rouleau résilient et ne laisser que l'encre retenue dans les dépressions; et
d. un dispositif d'entraînement destiné à faire tourner au moins le rouleau gravé à une vitesse contrôlée,

caractérisée par le fait;
e. que le rouleau résilient (44) est d'une longueur plus courte que le rouleau gravé (16) et présente deux surfaces d'encrage cylindriques séparées (45, 47);
f. que les dispositifs (46, 48) sont prévus pour le réglage de la pression exercée entre les rouleaux de telle sorte que lorsque les rouleaux sont en contact direct, un état d'équilibre de transfert d'encre se trouve établi, état d'équilibre dans lequel un film uniforme d'encre est laissé sur la surface du rouleau résilient et qu'avec une feuille de papier ou d'une matière du même genre passant à travers le resserrement entre les rouleaux, l'encre est déposée seulement sur la face de la feuille avec laquelle le rouleau résilient se trouve en contact; et
g. qu'un dispositif de collecte de feuilles est prévu du côté sortie du resserrement entre les rouleaux pour recevoir et supporter une feuille de papier ou d'une matière du même genre après que cette dernière soit passée entre les rouleaux et ait été encrée par lesdites rouleaux.
4. Un appareil tel que revendiqué dans la revendication 3 dans laquelle le dispositif d'alimentation et de guidage des feuilles est situé à l'entrée du resserrement.
5. Un appareil tel que revendiqué dans la revendication 3 ou 4 dans lequel sont prévus des dispositifs de réglage de la vitesse de rotation du rouleau gravé.
6. Un appareil tel que revendiqué dans l'une quelconque des revendications 3 à 5 dans lequel est prévu un dispositif permettant le nettoyage des rouleaux après utilisation de l'appareillage.
7. Un appareil tel que revendiqué dans l'une quelconque des revendications 3 à 6 dans lequel la gravure du rouleau gravé est destinée à produire entre 40 et 160, typiquement 120 cavités par cm, à la fois dans la direction axiale et dans la direction circonférentielle de mesure autour du rouleau gravé et dans lequel les cavités ont une profondeur entre 42 et 420 microns.
8. Un appareil tel que revendiqué dans l'une quelconque des revendications 3 à 7 dans lequel chaque premier rouleau est monté sur un cadre articulé et est déplaçable depuis une position élevée éloignée du rouleau gravé jusque dans une position inférieure au contact dudit rouleau gravé.
9. Un appareil tel que revendiqué dans l'une quelconque des revendications 3 à 8 dans lequel le rouleau déformable de manière résiliente comprend deux ou plusieurs rouleaux séparés espacés axialement le long d'un axe de rotation commun.
10. Un appareillage tel que revendiqué dans l'une quelconque de revendications 3 à 8 dans lequel le système à rouleau déformable de manière résiliente comprend un rouleau unique comportant une ou plusieurs gorges définissant deux ou plusieurs surfaces d'encrage cylindriques autour desquelles un film d'encre peut être formé pour l'application à la surface de la feuille entre les surfaces encrées et le rouleau gravé.
EP83303166A 1982-11-18 1983-06-01 Appareil d'essai d'encres d'impression Expired EP0109725B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83303166T ATE30400T1 (de) 1982-11-18 1983-06-01 Druckfarbenpruefgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8232894 1982-11-18
GB8232894 1982-11-18

Publications (3)

Publication Number Publication Date
EP0109725A2 EP0109725A2 (fr) 1984-05-30
EP0109725A3 EP0109725A3 (en) 1985-05-08
EP0109725B1 true EP0109725B1 (fr) 1987-10-28

Family

ID=10534344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303166A Expired EP0109725B1 (fr) 1982-11-18 1983-06-01 Appareil d'essai d'encres d'impression

Country Status (4)

Country Link
EP (1) EP0109725B1 (fr)
AT (1) ATE30400T1 (fr)
DE (1) DE3374187D1 (fr)
GB (1) GB2131348B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852486A (en) * 1988-11-25 1989-08-01 Basf Corporation Portable flexographic proofer device
DE19819455C2 (de) * 1998-04-30 2001-07-19 Pruefbau Dr Ing H Duerner Gmbh Vorrichtung zur Messung der Klebrigkeit eines fließfähigen Mediums
CN100393510C (zh) * 2005-03-15 2008-06-11 东莞东运机械制造有限公司 凹版打样机
CN100393511C (zh) * 2005-03-15 2008-06-11 东莞东运机械制造有限公司 一种凹版打样机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605615A (en) * 1969-06-25 1971-09-20 William F Huck Printability tester
GB1349753A (en) * 1970-04-27 1974-04-10 Odhams Watford Ltd Printing press

Also Published As

Publication number Publication date
GB2131348A (en) 1984-06-20
EP0109725A2 (fr) 1984-05-30
ATE30400T1 (de) 1987-11-15
EP0109725A3 (en) 1985-05-08
GB2131348B (en) 1985-10-09
DE3374187D1 (en) 1987-12-03
GB8311828D0 (en) 1983-06-02

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