EP2021180B1 - Device for creating a printing plate and development process - Google Patents

Device for creating a printing plate and development process Download PDF

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Publication number
EP2021180B1
EP2021180B1 EP07766096A EP07766096A EP2021180B1 EP 2021180 B1 EP2021180 B1 EP 2021180B1 EP 07766096 A EP07766096 A EP 07766096A EP 07766096 A EP07766096 A EP 07766096A EP 2021180 B1 EP2021180 B1 EP 2021180B1
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EP
European Patent Office
Prior art keywords
photopolymer
layer
thickness
holder
application means
Prior art date
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Not-in-force
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EP07766096A
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German (de)
French (fr)
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EP2021180A1 (en
Inventor
Christian Barral
David Brazier
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MacDermid Graphics Solutions Europe SAS
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MacDermid Printing Solutions Europe SAS
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Publication of EP2021180A1 publication Critical patent/EP2021180A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1005—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern

Definitions

  • the present invention relates to a device for producing a printing plate, and to a method for producing such a printing plate.
  • a printing plate is obtained by placing a support such as a translucent plate or a plate provided with a negative of a page to be printed, on a work surface or plate and then applying successively on the support a liquid photopolymer then a film intended to constitute the base of the printing plate. Then, the thickness of the printing plate is measured and, when this thickness differs from a predetermined thickness or setpoint thickness, the means with which the photopolymer is applied are adjusted to obtain the desired thickness of the plate printing.
  • apparatuses having a reservoir from which the photopolymer is removed by gravity are preferably used.
  • the reservoir is provided with an outlet in the form of a slot facing downwards and the liquid photopolymer is then applied, passing from the reservoir on the support, while the reservoir is running over the support following a scroll direction.
  • a speed with which the reservoir must pass over the support The higher the speed of the tank, the thinner the deposited photopolymer layer is. Consequently, to adjust the thickness of the photopolymer layer to be obtained, the speed with which the tank scrolls is varied.
  • a device comprising a reel in which a film reel is mounted.
  • the apparatus for producing a printing plate having such a design has the advantage of a simple structure and the absence of complicated adjustment mechanisms.
  • photopolymers although called “liquid”, are viscous and their viscosity, at equal temperature, can vary from one delivery batch to another.
  • the viscosity varies according to the ambient temperature which prevails around the apparatus for producing the printing plates.
  • the viscous nature of the photopolymers causes that, as opposed to the behavior of a liquid product such as water, the photopolymers leaving the tank by gravity flow from the tank with a clean speed which is not only a function of the degree of viscosity of the polymer, but also the configuration of the tank outlet slot.
  • the flow rate of the photopolymer to be deposited it is generally chosen to vary the speed of travel of the tank above the support. However, when the speed of travel exceeds a limit, which is generally different from one photopolymer to another, there may be an irregular flow of the photopolymer, or even breakage of the flow of the photopolymer.
  • Another disadvantage of the system described above lies in the fact that the entire thickness of the printing plate is measured. Thus, in the case of a difference between the setpoint thickness and the actual measured thickness, it is not possible to distinguish between an error in the thickness of the photopolymer layer and an error due to a problem of laying or the thickness of the film. As a result, it is impossible to make precisely targeted corrections to obtain a printing plate according to the predetermined dimensions.
  • the thickness of the applied layer is measured at a distance from the photopolymer application means.
  • the object of the invention is to overcome the disadvantages described above.
  • the object of the invention is achieved with a device according to claim 1.
  • the verification means comprises a detector mounted on the downstream side of the application means so as to be disposed above a portion of the photopolymer layer that has just been applied, a comparator intended to comparing the actual thickness of the portion of the polymer layer just applied with the predetermined thickness and an electrical signal generator for generating a correction signal in case of difference between the actual thickness and the predetermined thickness , the generator being connected to a device for adjusting the photopolymer flow rate of the application means.
  • the device of the invention has the advantage of being able to check the thickness of the single photopolymer layer and to be able to do it continuously and especially in a part of the photopolymer layer that has just been applied. Due to the short distance between the place where the liquid photopolymer falls on the support and the part of the photopolymer layer where the thickness is verified, the reaction in case of drifting the predetermined thickness is almost immediate.
  • the provisions of the invention make it possible to place the film application means close enough to the photopolymer application means.
  • the provisions of the invention therefore do not lead to a significant enlargement of the device for producing a printing plate.
  • the provisions of the invention also make it possible, according to a preferred embodiment of the invention, not to measure the actual thickness of the applied photopolymer layer, but to verify whether the surface of the deposited photopolymer layer remains at a desired temperature. constant level or not. Indeed, in the case of producing a photopolymer layer with an ideally constant thickness, the constant level of the surface of the photopolymer layer is then representative of the constancy of the thickness of the layer produced.
  • This arrangement of the invention is particularly advantageous because of the transparency of liquid photopolymers.
  • the support is often black.
  • the thickness of the applied layer is difficult to measure with optical reflection means.
  • it is easier to monitor the level of the surface of the applied layer with a reflection detector, preferably with a defined reflection working type detector.
  • This type of detector uses the reflection of a beam of light on the surface of the resin in the case of a non-normal incidence.
  • specular reflection on a very smooth surface (as is the case of a liquid) with an angle of incidence that is equal and opposite to the normal at the angle of reflection.
  • the principle of checking the level of the surface of the applied layer also has the advantage of a simple apparatus operating over a wide range of polymer layer thicknesses. Indeed, the device of the invention, in the embodiment explained, operating only the level of the surface of the layer, the thickness of the photopolymer layer has become unimportant.
  • such an apparatus may be equipped with a tray or a worktop or any other means shaped to maintain or carry the support on which the photopolymer is to be applied and to arrange this plate at a variable level relative to by means of photopolymer application.
  • the plate is movably mounted so as to be remote or close to the photopolymer application means and thus to adjust a predetermined thickness or setpoint thickness.
  • the tray is mounted in a fixed position and it is the photopolymer application means and the film reel that are movably mounted so that they can be moved closer to or away from the tray.
  • the application means comprises dosing means.
  • This arrangement of the invention makes it possible to scroll the photopolymer application means with respect to the support with a constant speed of movement or application. More particularly, this arrangement of the invention makes it possible to use a motor with a constant speed, which simplifies the device of the invention thanks to the absence of a variable speed drive.
  • the application means comprises a reservoir for the photopolymer and, at the end of the reservoir, dosing means.
  • the dosing means can be arranged immediately after the outlet of the tank.
  • the outlet of the tank which is generally in the form of a slot, is formed at least partially by dosing means.
  • the reservoir is shaped so that the photopolymer can exit through a slot with variable aperture, this slot being formed between a doctor blade and a cylindrical body of non-circular cross section.
  • the doctor blade and the cylindrical body being mounted on the tank, they form an integral part.
  • the variation of the opening of the slot is obtained by rotating the cylindrical body about its longitudinal axis according to an electrical correction signal generated by the detector verifying the constancy of the level of the surface of the deposited polymer layer.
  • the cylindrical body is provided with a flat portion extending in a plane parallel to its longitudinal axis.
  • This flat surface gives the cross section of the cylindrical body the non-circular shape. Since the non-circular side of the cross-section is oriented towards the doctor blade and the outlet slot of the reservoir is thus delimited between the non-circular side of the cylindrical body and the doctor blade, the opening of the slot can be varied by rotating the cylindrical body around of its longitudinal axis.
  • the doctor blade is disposed above the support for receiving a layer of a photopolymer at a height which is greater than the predetermined thickness of the photopolymer layer to be applied.
  • the height at which the doctor blade is arranged relative to the support about 2 mm larger than the thickness of the photopolymer layer to be produced.
  • the object of the invention is also achieved with a method according to claim 7.
  • This method is advantageously implemented using the device described above.
  • the figure 1 represents a device for producing a printing plate according to the invention.
  • This device comprises a support 1 intended to receive a liquid photopolymer and then a film intended to constitute the base of the printing plate, as well as an application means 3 of the liquid photopolymer on the support 1 in a layer 2 and a means check 5 the thickness of the layer 2 applied.
  • the application means 3 moves relative to the support 1 in the direction D.
  • the support 1 rests on a plate 30.
  • the verification means 5 comprises a detector mounted on the downstream side of the application means 3.
  • the detector 5 is thus disposed above a portion of the photopolymer layer 2, which has just been applied.
  • the detector 5 is connected to a comparator (not shown) for comparing the actual thickness of the portion of the previously applied polymer layer 2 with the predetermined thickness.
  • the comparator comprises, or is connected to, an electrical signal generator for generating a correction signal in case of a difference between the actual thickness and the predetermined thickness of the photopolymer layer.
  • the electrical signal generator is connected to a device for adjusting the photopolymer flow rate of the application means 3.
  • the plate 30 and the application device 3 are advantageously mounted so that one can be moved in elevation relative to the other. Generally, it will be easier to mount the plate 30 movable relative to the application means 3 fixedly mounted.
  • the figure 2 represents the different elements of the application means 3 and the position relative to the support 1.
  • the application means 3 comprises a reservoir 4 for the photopolymer and, at the end of the reservoir 4, dosing means 7, 8.
  • the metering means 7, 8 comprise a doctor blade 7 and a cylindrical body 8 having an axis longitudinal 9 and a non-circular cross section.
  • the non-circular shape of the section of the body 8 is obtained by a flat part 10 which extends in a plane parallel to the longitudinal axis 9 of the cylindrical body 8.
  • the flat part 10 is oriented towards the doctor blade 7 so as to define a slot 6 to opening L variable between the doctor blade 7 and the cylindrical body 8.
  • the variation of the opening L of the slot 6 is obtained by rotating the cylindrical body 8 about its longitudinal axis 9 according to an electrical correction signal generated by the detector 5.
  • the orientation of the flat part 10 with respect to a vertical plane is indicated in the figure by an opening angle Q.
  • the figure 2 also represents the thickness g of the photopolymer layer 2 and the height h at which the doctor blade 7 is disposed. Without this being indicated numerically, the figure 2 clearly shows that the height h is greater than the thickness g of the photopolymer layer 2. It goes without saying that the embodiment by the cylindrical body 8 with a flat is one embodiment among others. We can, without leaving the framework of the invention uses a plug system or a slotted system or a functional equivalent.
  • the thickness g of the deposited photopolymer layer 2 can be varied while keeping a constant rate of application.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Coating Apparatus (AREA)

Abstract

The invention concerns a device for creating a printing plate including a support (1) designed to be exposed to liquid photopolymer then a film designed to constitute the base of the printing plate, a means of application (3) of the liquid photopolymer on the support (1) in a layer (2) of predetermined thickness and a means of verification (5) of the actual thickness of the layer (2) applied. The means of verification includes a detector (5), mounted on the downstream side of the means of application (3), such that it is situated over a section of the photopolymer layer (2) that has just been applied, the detector (5) generating an electric signal, on the basis of which the flow of photopolymer is adjusted, when the actual thickness of the layer (2) applied differs from the predetermined value. The invention also concerns a procedure of making a printing plate, preferably implemented via said device.

Description

La présente invention concerne un dispositif pour la réalisation d'une plaque d'impression, ainsi qu'un procédé de réalisation d'une telle plaque d'impression.The present invention relates to a device for producing a printing plate, and to a method for producing such a printing plate.

Habituellement, une plaque d'impression est obtenue en posant un support telle une plaque translucide ou une plaque pourvue d'un négatif d'une page à imprimer, sur un plan de travail ou plateau et en appliquant ensuite sur le support successivement un photopolymère liquide puis un film destiné à constituer la base de la plaque d'impression. Ensuite, l'épaisseur de la plaque d'impression est mesurée et, lorsque cette épaisseur diffère d'une épaisseur prédéterminée ou épaisseur de consigne, les moyens avec lesquels le photopolymère est appliqué sont réglés de manière à obtenir l'épaisseur souhaitée de la plaque d'impression.Usually, a printing plate is obtained by placing a support such as a translucent plate or a plate provided with a negative of a page to be printed, on a work surface or plate and then applying successively on the support a liquid photopolymer then a film intended to constitute the base of the printing plate. Then, the thickness of the printing plate is measured and, when this thickness differs from a predetermined thickness or setpoint thickness, the means with which the photopolymer is applied are adjusted to obtain the desired thickness of the plate printing.

Pour appliquer le photopolymère, on utilise de préférence des appareils comportant un réservoir à partir duquel le photopolymère sort par gravité. A cette fin, le réservoir est pourvu d'une sortie en forme d'une fente orientée vers le bas et le photopolymère liquide est alors appliqué, en passant du réservoir sur le support, pendant que le réservoir défile au-dessus du support suivant une direction de défilement. Pour régler l'épaisseur de la couche de polymère à obtenir, on détermine, suivant la viscosité du photopolymère, une vitesse avec laquelle le réservoir doit défiler au-dessus du support. Plus la vitesse du réservoir est grande, plus l'épaisseur de la couche de photopolymère déposée est fine. En conséquence, pour régler l'épaisseur de la couche de photopolymère à obtenir, on varie la vitesse avec laquelle le réservoir défile.In order to apply the photopolymer, apparatuses having a reservoir from which the photopolymer is removed by gravity are preferably used. To this end, the reservoir is provided with an outlet in the form of a slot facing downwards and the liquid photopolymer is then applied, passing from the reservoir on the support, while the reservoir is running over the support following a scroll direction. In order to adjust the thickness of the polymer layer to be obtained, it is determined, according to the viscosity of the photopolymer, a speed with which the reservoir must pass over the support. The higher the speed of the tank, the thinner the deposited photopolymer layer is. Consequently, to adjust the thickness of the photopolymer layer to be obtained, the speed with which the tank scrolls is varied.

Et pour déposer le film destiné à constituer la base de la plaque d'impression à réaliser, on peut utiliser, par exemple, un dispositif comportant un dévidoir dans lequel est monté une bobine de film.And to deposit the film intended to constitute the base of the printing plate to be produced, it is possible to use, for example, a device comprising a reel in which a film reel is mounted.

L'appareil de réalisation d'une plaque d'impression ayant une telle conception présente l'avantage d'une structure simple et de l'absence de mécanismes de réglage compliqués.The apparatus for producing a printing plate having such a design has the advantage of a simple structure and the absence of complicated adjustment mechanisms.

Cependant, une telle conception présente néanmoins des inconvénients. Tout d'abord, les photopolymères, bien que appelés « liquide », sont visqueux et leur viscosité, à température égale, peut varier d'un lot de livraison à l'autre. De plus, la viscosité varie selon la température ambiante qui règne autour de l'appareil de réalisation des plaques d'impression.However, such a design nevertheless has disadvantages. Firstly, photopolymers, although called "liquid", are viscous and their viscosity, at equal temperature, can vary from one delivery batch to another. In addition, the viscosity varies according to the ambient temperature which prevails around the apparatus for producing the printing plates.

Le caractère visqueux des photopolymères fait que, par opposition au comportement d'un produit liquide comme l'eau, les photopolymères sortant du réservoir par gravité coulent du réservoir avec une vitesse propre qui est non seulement fonction du degré de viscosité du polymère, mais aussi de la configuration de la fente de sortie du réservoir.The viscous nature of the photopolymers causes that, as opposed to the behavior of a liquid product such as water, the photopolymers leaving the tank by gravity flow from the tank with a clean speed which is not only a function of the degree of viscosity of the polymer, but also the configuration of the tank outlet slot.

Aussi, pour varier le débit du photopolymère à déposer, on choisit généralement de varier la vitesse de défilement du réservoir au-dessus du support. Cependant, lorsque la vitesse de défilement dépasse une limite, qui est généralement différente d'un photopolymère à l'autre, il peut y avoir un débit irrégulier du photopolymère, voire rupture du flux du photopolymère.Also, to vary the flow rate of the photopolymer to be deposited, it is generally chosen to vary the speed of travel of the tank above the support. However, when the speed of travel exceeds a limit, which is generally different from one photopolymer to another, there may be an irregular flow of the photopolymer, or even breakage of the flow of the photopolymer.

Un autre inconvénient du système décrit plus haut, réside dans le fait que l'on mesure l'épaisseur entière de la plaque d'impression. Ainsi, en cas de différence entre l'épaisseur de consigne et l'épaisseur réellement mesurée, on ne peut pas distinguer entre une erreur dans l'épaisseur de la couche de photopolymère et une erreur due à un problème de pose ou de l'épaisseur du film. Il en résulte l'impossibilité d'apporter des corrections précisément ciblées pour obtenir une plaque d'impression selon les dimensions prédéterminées.Another disadvantage of the system described above lies in the fact that the entire thickness of the printing plate is measured. Thus, in the case of a difference between the setpoint thickness and the actual measured thickness, it is not possible to distinguish between an error in the thickness of the photopolymer layer and an error due to a problem of laying or the thickness of the film. As a result, it is impossible to make precisely targeted corrections to obtain a printing plate according to the predetermined dimensions.

De plus, comme cela est décrit, par exemple dans les documents US-A-5 735 983 et US-A-6 376 012 , l'épaisseur de la couche appliquée est mesurée à une certaine distance des moyens d'application de photopolymère. Une telle disposition augmente l'incertitude sur l'origine d'une erreur éventuelle. Il en résulte une encore plus grande impossibilité d'apporter des corrections précisément ciblées pour obtenir une plaque d'impression selon les dimensions prédéterminées.In addition, as described, for example in the documents US-A-5,735,983 and US-A-6,376,012 the thickness of the applied layer is measured at a distance from the photopolymer application means. Such a provision increases the uncertainty about the origin of a possible error. This results in an even greater impossibility to make precisely targeted corrections to obtain a printing plate according to the predetermined dimensions.

Le but de l'invention est de remédier aux inconvénients décrits ci avant.The object of the invention is to overcome the disadvantages described above.

Le but de l'invention est atteint avec un dispositif selon la revendication 1.The object of the invention is achieved with a device according to claim 1.

Conformément à l'invention, le moyen de vérification comprend un détecteur monté sur le côté aval du moyen d'application de manière à être disposé au-dessus d'une partie de la couche de photopolymère venant d'être appliquée, un comparateur destiné à comparer l'épaisseur réelle de la partie de la couche de polymère venant d'être appliquée avec l'épaisseur prédéterminée et un générateur de signaux électriques destiné à engendrer un signal de correction en cas de différence entre l'épaisseur réelle et l'épaisseur prédéterminée, le générateur étant relié à un dispositif de réglage du débit de photopolymère du moyen d'application.According to the invention, the verification means comprises a detector mounted on the downstream side of the application means so as to be disposed above a portion of the photopolymer layer that has just been applied, a comparator intended to comparing the actual thickness of the portion of the polymer layer just applied with the predetermined thickness and an electrical signal generator for generating a correction signal in case of difference between the actual thickness and the predetermined thickness , the generator being connected to a device for adjusting the photopolymer flow rate of the application means.

Le dispositif de l'invention apporte l'avantage de pouvoir vérifier l'épaisseur de la seule couche de photopolymère et de pouvoir le faire continuellement et surtout dans une partie de la couche photopolymère qui vient d'être appliquée. Grâce à la courte distance entre l'endroit où le photopolymère liquide tombe sur le support et la partie de la couche photopolymère où l'épaisseur est vérifiée, la réaction en cas de dérive de l'épaisseur prédéterminée est pratiquement immédiate.The device of the invention has the advantage of being able to check the thickness of the single photopolymer layer and to be able to do it continuously and especially in a part of the photopolymer layer that has just been applied. Due to the short distance between the place where the liquid photopolymer falls on the support and the part of the photopolymer layer where the thickness is verified, the reaction in case of drifting the predetermined thickness is almost immediate.

En outre, les dispositions de l'invention permettent de placer les moyens d'application du film assez proche du moyen d'application de photopolymère. Les dispositions de l'invention ne conduisent donc pas à un agrandissement notable du dispositif de réalisation d'une plaque d'impression.In addition, the provisions of the invention make it possible to place the film application means close enough to the photopolymer application means. The provisions of the invention therefore do not lead to a significant enlargement of the device for producing a printing plate.

Les dispositions de l'invention permettent par ailleurs, selon un mode de réalisation préféré de l'invention, de ne pas mesurer l'épaisseur réelle de la couche de photopolymère appliquée, mais de vérifier si la surface de la couche photopolymère déposée reste à un niveau constant ou non. En effet, en cas de réalisation d'une couche de photopolymères avec une épaisseur idéalement constante, le niveau constant de la surface de la couche de photopolymère est alors représentatif de la constance de l'épaisseur de la couche réalisée.The provisions of the invention also make it possible, according to a preferred embodiment of the invention, not to measure the actual thickness of the applied photopolymer layer, but to verify whether the surface of the deposited photopolymer layer remains at a desired temperature. constant level or not. Indeed, in the case of producing a photopolymer layer with an ideally constant thickness, the constant level of the surface of the photopolymer layer is then representative of the constancy of the thickness of the layer produced.

Cette disposition de l'invention est particulièrement avantageuse en raison de la transparence des photopolymères liquides. De plus, le support est souvent noir. De ce fait, l'épaisseur de la couche appliquée est difficilement mesurable avec des moyens de réflexion optique. En contrepartie, il est plus facile de surveiller le niveau de la surface de la couche appliquée avec un détecteur à réflexion, de préférence avec un détecteur du type à travailler par réflexion définie.This arrangement of the invention is particularly advantageous because of the transparency of liquid photopolymers. In addition, the support is often black. As a result, the thickness of the applied layer is difficult to measure with optical reflection means. In return, it is easier to monitor the level of the surface of the applied layer with a reflection detector, preferably with a defined reflection working type detector.

Ce type de détecteur utilise la réflexion d'un faisceau de lumière sur la surface de la résine dans le cas d'une incidence non normale. On parle de réflexion spéculaire sur une surface très lisse (comme c'est le cas d'un liquide) avec un angle d'incidence qui est égal et opposé par rapport à la normale à l'angle de réflexion.This type of detector uses the reflection of a beam of light on the surface of the resin in the case of a non-normal incidence. We speak of specular reflection on a very smooth surface (as is the case of a liquid) with an angle of incidence that is equal and opposite to the normal at the angle of reflection.

Le principe de la vérification du niveau de la surface de la couche appliquée présente par ailleurs l'avantage d'un appareil simple et fonctionnant sur une large gamme d'épaisseurs de couches polymères. En effet, le dispositif de l'invention, dans le mode de réalisation expliqué, n'exploitant que le niveau de la surface de la couche, l'épaisseur de la couche de photopolymère est devenue sans importance.The principle of checking the level of the surface of the applied layer also has the advantage of a simple apparatus operating over a wide range of polymer layer thicknesses. Indeed, the device of the invention, in the embodiment explained, operating only the level of the surface of the layer, the thickness of the photopolymer layer has become unimportant.

En même temps, cela simplifie l'appareil de réalisation des plaques d'impression. En effet, un tel appareil peut être équipé d'un plateau ou d'un plan de travail ou de tout autre moyen conformé pour maintenir ou porter le support sur lequel le photopolymère doit être appliqué et pour disposer ce plateau à un niveau variable par rapport au moyen d'application de photopolymère. En d'autres mots, selon une première variante de réalisation, le plateau est monté mobile de manière à pouvoir être éloigné ou rapproché du moyen d'application de photopolymère et à régler ainsi une épaisseur prédéterminée ou épaisseur de consigne. Selon une seconde variante, le plateau est monté en position fixe et ce sont le moyen d'application de photopolymère et le dévidoir de film qui sont montés mobiles de manière à pouvoir être rapprochés ou éloignés du plateau.At the same time, it simplifies the apparatus for making the printing plates. Indeed, such an apparatus may be equipped with a tray or a worktop or any other means shaped to maintain or carry the support on which the photopolymer is to be applied and to arrange this plate at a variable level relative to by means of photopolymer application. In other words, according to a first variant embodiment, the plate is movably mounted so as to be remote or close to the photopolymer application means and thus to adjust a predetermined thickness or setpoint thickness. In a second variant, the tray is mounted in a fixed position and it is the photopolymer application means and the film reel that are movably mounted so that they can be moved closer to or away from the tray.

Selon une autre caractéristique de la présente invention, le moyen d'application comprend des moyens de dosage. Cette disposition de l'invention permet de faire défiler le moyen d'application de photopolymère par rapport au support avec une vitesse de défilement ou d'application constante. Plus particulièrement, cette disposition de l'invention permet d'utiliser un moteur à vitesse constante, ce qui simplifie le dispositif de l'invention grâce à l'absence d'un variateur de vitesse.According to another characteristic of the present invention, the application means comprises dosing means. This arrangement of the invention makes it possible to scroll the photopolymer application means with respect to the support with a constant speed of movement or application. More particularly, this arrangement of the invention makes it possible to use a motor with a constant speed, which simplifies the device of the invention thanks to the absence of a variable speed drive.

Selon encore une autre caractéristique de l'invention, le moyen d'application comprend un réservoir pour le photopolymère et, à l'issue du réservoir, des moyens de dosage. Les moyens de dosage peuvent être disposés immédiatement après l'issue du réservoir. Toutefois, il est préférable que l'issue du réservoir, qui se présente généralement sous la forme d'une fente, soit formé au moins partiellement par des moyens de dosage.According to yet another characteristic of the invention, the application means comprises a reservoir for the photopolymer and, at the end of the reservoir, dosing means. The dosing means can be arranged immediately after the outlet of the tank. However, it is preferable that the outlet of the tank, which is generally in the form of a slot, is formed at least partially by dosing means.

Le réservoir est conformé pour que le photopolymère puisse en sortir à travers une fente à ouverture variable, cette fente étant formée entre une racle et un corps cylindrique à section transversale non circulaire. La racle et le corps cylindrique étant montés sur le réservoir, ils en font partie intégrante. La variation de l'ouverture de la fente est obtenue par rotation du corps cylindrique autour de son axe longitudinal suivant un signal électrique de correction engendré par le détecteur vérifiant la constance du niveau de la surface de la couche polymère déposée.The reservoir is shaped so that the photopolymer can exit through a slot with variable aperture, this slot being formed between a doctor blade and a cylindrical body of non-circular cross section. The doctor blade and the cylindrical body being mounted on the tank, they form an integral part. The variation of the opening of the slot is obtained by rotating the cylindrical body about its longitudinal axis according to an electrical correction signal generated by the detector verifying the constancy of the level of the surface of the deposited polymer layer.

Selon une variante de réalisation représentée dans les dessins, le corps cylindrique est pourvu d'un méplat s'étendant suivant un plan parallèle à son axe longitudinal. Ce méplat donne à la section transversale du corps cylindrique la forme non circulaire. Le côté non circulaire de la section transversale étant orienté vers la racle et la fente de sortie du réservoir étant donc délimitée entre le côté non circulaire du corps cylindrique et la racle, l'ouverture de la fente peut être variée par rotation du corps cylindrique autour de son axe longitudinal.According to an alternative embodiment shown in the drawings, the cylindrical body is provided with a flat portion extending in a plane parallel to its longitudinal axis. This flat surface gives the cross section of the cylindrical body the non-circular shape. Since the non-circular side of the cross-section is oriented towards the doctor blade and the outlet slot of the reservoir is thus delimited between the non-circular side of the cylindrical body and the doctor blade, the opening of the slot can be varied by rotating the cylindrical body around of its longitudinal axis.

Selon un autre aspect de l'invention, la racle est disposée au-dessus du support destiné à recevoir une couche d'un photopolymère, à une hauteur qui est supérieure à l'épaisseur prédéterminée de la couche de photopolymères à appliquer.According to another aspect of the invention, the doctor blade is disposed above the support for receiving a layer of a photopolymer at a height which is greater than the predetermined thickness of the photopolymer layer to be applied.

Afin de garantir un débit homogène du photopolymère à une vitesse de défilement choisie du moyen d'application, il est recommandé que la hauteur à laquelle la racle est disposée par rapport au support, soit environ 2 mm plus grande que l'épaisseur de la couche de photopolymère à réaliser.In order to guarantee a homogeneous flow rate of the photopolymer at a chosen running speed of the application means, it is recommended that the height at which the doctor blade is arranged relative to the support, about 2 mm larger than the thickness of the photopolymer layer to be produced.

Le but de l'invention est également atteint avec un procédé selon la revendication 7.The object of the invention is also achieved with a method according to claim 7.

Conformément à l'invention, le procédé comprend au moins les étapes suivantes :

  • poser un support destiné à recevoir une couche de photopolymère liquide,
  • appliquer le photopolymère liquide sur le support en une couche ayant une surface et une épaisseur prédéterminée,
  • vérifier l'épaisseur de la partie de la couche de polymère venant d'être appliquée,
  • engendrer un signal de correction si l'épaisseur réelle diffère de l'épaisseur prédéterminée et
  • réajuster un doseur du moyen d'application suivant le signal de correction.
According to the invention, the method comprises at least the following steps:
  • to put a support intended to receive a layer of liquid photopolymer,
  • applying the liquid photopolymer on the support in a layer having a surface and a predetermined thickness,
  • check the thickness of the part of the polymer layer that has just been applied,
  • generate a correction signal if the actual thickness differs from the predetermined thickness and
  • readjust a doser of the application means according to the correction signal.

Ce procédé est avantageusement mis en oeuvre à l'aide du dispositif décrit plus haut.This method is advantageously implemented using the device described above.

D'autres caractéristiques et avantages de la présente invention ressortiront dans la description ci-après d'un mode de réalisation du dispositif de l'invention. La description est faite en référence aux dessins dans lesquels :

  • la figure 1 représente très schématiquement un dispositif de l'invention et
  • la figure 2 représente la disposition des différents éléments du moyen d'application du dispositif de l'invention en une vue latérale.
Other features and advantages of the present invention will become apparent in the description below of an embodiment of the device of the invention. The description is made with reference to the drawings in which:
  • the figure 1 very schematically represents a device of the invention and
  • the figure 2 represents the arrangement of the different elements of the application means of the device of the invention in a side view.

La figure 1 représente un dispositif pour la réalisation d'une plaque d'impression selon l'invention. Ce dispositif comprend un support 1 destiné à recevoir un photopolymère liquide puis un film destiné à constituer la base de la plaque d'impression, ainsi qu'un moyen d'application 3 du photopolymère liquide sur le support 1 en une couche 2 et un moyen de vérification 5 de l'épaisseur de la couche 2 appliquée. Lors du dépôt de la couche 2, le moyen d'application 3 se déplace par rapport au support 1 suivant la direction D. Le support 1 repose sur un plateau 30.The figure 1 represents a device for producing a printing plate according to the invention. This device comprises a support 1 intended to receive a liquid photopolymer and then a film intended to constitute the base of the printing plate, as well as an application means 3 of the liquid photopolymer on the support 1 in a layer 2 and a means check 5 the thickness of the layer 2 applied. During the deposition of the layer 2, the application means 3 moves relative to the support 1 in the direction D. The support 1 rests on a plate 30.

Le moyen de vérification 5 comprend un détecteur monté sur le côté aval du moyen d'application 3. Le détecteur 5 est ainsi disposé au-dessus d'une partie de la couche de photopolymères 2, qui vient d'être appliquée. Le détecteur 5 est relié à un comparateur (non représenté) destiné à comparer l'épaisseur réelle de la partie de la couche de polymère 2 venant d'être appliquée avec l'épaisseur prédéterminée. Le comparateur comporte, ou est relié à, un générateur de signaux électriques destiné à engendrer un signal de correction en cas de différence entre l'épaisseur réelle et l'épaisseur prédéterminée de la couche de photopolymère. Le générateur de signaux électriques est relié à un dispositif de réglage du débit de photopolymère du moyen d'application 3.The verification means 5 comprises a detector mounted on the downstream side of the application means 3. The detector 5 is thus disposed above a portion of the photopolymer layer 2, which has just been applied. The detector 5 is connected to a comparator (not shown) for comparing the actual thickness of the portion of the previously applied polymer layer 2 with the predetermined thickness. The comparator comprises, or is connected to, an electrical signal generator for generating a correction signal in case of a difference between the actual thickness and the predetermined thickness of the photopolymer layer. The electrical signal generator is connected to a device for adjusting the photopolymer flow rate of the application means 3.

Dans un appareil ou une installation de réalisation de plaques d'impression, le plateau 30 et le dispositif d'application 3 sont montés avantageusement de manière que l'un puisse être déplacé en élévation par rapport à l'autre. Généralement, il sera plus facile de monter le plateau 30 mobile par rapport au moyen d'application 3 monté fixe.In an apparatus or an installation for producing printing plates, the plate 30 and the application device 3 are advantageously mounted so that one can be moved in elevation relative to the other. Generally, it will be easier to mount the plate 30 movable relative to the application means 3 fixedly mounted.

La figure 2 représente les différents éléments du moyen d'application 3 et la position par rapport au support 1.The figure 2 represents the different elements of the application means 3 and the position relative to the support 1.

Le moyen d'application 3 comprend un réservoir 4 pour le photopolymère et, à l'issue du réservoir 4, des moyens de dosage 7, 8. Les moyens de dosage 7, 8 comprennent une racle 7 et un corps cylindrique 8 ayant un axe longitudinal 9 et une section transversale non circulaire. La forme non circulaire de la section du corps 8 est obtenue par un méplat 10 qui s'étend suivant un plan parallèle à l'axe longitudinal 9 du corps cylindrique 8. Le méplat 10 est orienté vers la racle 7 de manière à définir une fente 6 à ouverture L variable entre la racle 7 et le corps cylindrique 8. La variation de l'ouverture L de la fente 6 est obtenue par rotation du corps cylindrique 8 autour de son axe longitudinal 9 suivant un signal électrique de correction engendré par le détecteur 5.The application means 3 comprises a reservoir 4 for the photopolymer and, at the end of the reservoir 4, dosing means 7, 8. The metering means 7, 8 comprise a doctor blade 7 and a cylindrical body 8 having an axis longitudinal 9 and a non-circular cross section. The non-circular shape of the section of the body 8 is obtained by a flat part 10 which extends in a plane parallel to the longitudinal axis 9 of the cylindrical body 8. The flat part 10 is oriented towards the doctor blade 7 so as to define a slot 6 to opening L variable between the doctor blade 7 and the cylindrical body 8. The variation of the opening L of the slot 6 is obtained by rotating the cylindrical body 8 about its longitudinal axis 9 according to an electrical correction signal generated by the detector 5.

L'orientation du méplat 10 par rapport à un plan vertical est indiquée dans la figure par un angle d'ouverture Q. Plus l'angle d'ouverture Ω est petit, plus l'ouverture L de la fente 6 est grande.The orientation of the flat part 10 with respect to a vertical plane is indicated in the figure by an opening angle Q. The smaller the opening angle Ω, the larger the opening L of the slot 6.

La figure 2 représente par ailleurs aussi l'épaisseur g de la couche de photopolymère 2 et la hauteur h à laquelle la racle 7 est disposée. Sans que cela ne soit indiqué numériquement, la figure 2 montre clairement que la hauteur h est plus grande que l'épaisseur g de la couche de photopolymère 2.
Il va de soi que le mode de réalisation par le corps cylindrique 8 avec un méplat est un mode de réalisation parmi d'autres. On pourra, sans sortir du cadre de l'invention utiliser un système à boisseau ou un système à fente mobile ou encore un équivalent fonctionnel.The figure 2 also represents the thickness g of the photopolymer layer 2 and the height h at which the doctor blade 7 is disposed. Without this being indicated numerically, the figure 2 clearly shows that the height h is greater than the thickness g of the photopolymer layer 2.
It goes without saying that the embodiment by the cylindrical body 8 with a flat is one embodiment among others. We can, without leaving the framework of the invention uses a plug system or a slotted system or a functional equivalent.

L'homme du métier comprendra aisément que l'épaisseur g de la couche de photopolymère 2 déposée pourra être variée tout en gardant une vitesse d'application constante.Those skilled in the art will readily understand that the thickness g of the deposited photopolymer layer 2 can be varied while keeping a constant rate of application.

Claims (8)

  1. A device for creating a printing plate comprising a holder (1) intended to receive a photopolymer liquid then a film intended to form the base of the printing plate, a reservoir (4) for the photopolymer, means (3) for applying the photopolymer liquid on the holder (1) in a layer (2) having a surface (21) and a predetermined thickness (g) and means (5) for verifying the thickness (g) of the applied layer (2), the verification means comprising a detector (5) mounted above the photopolymer layer (2), a comparator intended to compare the actual thickness of the polymer layer (2) with the predetermined thickness and an electric signal generator intended to create a correction signal in case of difference between the real thickness and the predetermined thickness, the generator being connected to a device for adjusting the flow rate of the photopolymer of the application means (3), characterized in that the detector (5) is mounted in a fixed position and directly on a downstream-side wall of the application means (3) so as to be able to able to detect the level of the surface (21) of the part of the photopolymer layer (2) having been applied, this level being representative of the real thickness of the photopolymer layer (2), in that the detection (5) is of the type to work by defined reflection, i.e. using the reflection of a beam of non-normal incident light on the surface (21) of the part of the photopolymer layer (2) having been applied and in that the reservoir (4) is shaped so that the photopolymer can exit it through a slot (6) with a variable width (L) formed between a blade (7) and a cylindrical body (8) with a non-circular transverse section mounted on the reservoir (4), the non-circular side being oriented toward the blade and the variation of the width of the slot (6) being obtained by rotation of the cylindrical body (8) around its longitudinal axis (9) according to an electrical correction signal created by the detector (5).
  2. The device according to claim 1, characterized in that the cylindrical body (8) is provided with a flat (10) extending along a plane parallel to the longitudinal axis (9) of the cylindrical body (8), said flat (10) giving the transverse section of the cylindrical body (8) the non-circular shape.
  3. The device according to claim 1 or 2, characterized in that the blade (7) is arranged above the holder (1) at a height (h) that is larger than the predetermined thickness (g) of the photopolymer layer to be applied.
  4. The device according to claim 3, characterized in that the height (h) at which the blade (7) is arranged is about 2 mm larger than the predetermined thickness (g) of the photopolymer layer (2).
  5. The device according to any one of claims 1 to 4, characterized in that it comprises, to maintain or support the holder (1), a plate (30) mounted at a variable level relative to the application means (3) of the liquid photopolymer.
  6. The device according to any one of claims 1 to 5, characterized in that it comprises a constant-speed motor to make the application means (3) travel above the holder (1).
  7. A method of creating a printing plate using a device comprising a holder (1) intended to receive a liquid photopolymer, then a film intended to make up the base of the printing plate, a reservoir (4) for the photopolymer, means (3) for applying the liquid photopolymer on the holder (1) in a layer (2) having a surface (21) and a predetermined thickness (g) and means (5) for verifying the thickness (g) of the applied layer (2), the method comprising at least the following steps:
    placing a holder (1) intended to receive a layer (2) of liquid photopolymer,
    applying the liquid photopolymer on the holder (1) in a layer (2) having a surface (21) and a predetermined thickness (g),
    verifying the thickness (g) of the polymer layer (2),
    creating a correction signal if the real thickness differs from the predetermined thickness (g), and
    readjusting a dosing apparatus (7, 8) of the application means (3) according to the correction signal, characterized in that the thickness (g) of the polymer layer is verified on the part of the layer having just been applied, i.e. by a detector (5) of the type working by defined reflection, i.e. using the reflection of a beam of non-normal incident light on the surface (21), and mounted in a fixed position and directly on a wall of the application means (3) on the downstream side of the application means (3).
  8. The method according to claim 7, characterized in that the application means (3) travels above the holder (1) with a constant application speed.
EP07766096A 2006-05-29 2007-05-24 Device for creating a printing plate and development process Not-in-force EP2021180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0651933A FR2901506B1 (en) 2006-05-29 2006-05-29 DEVICE FOR MAKING A PRINTING PLATE AND METHOD OF MAKING SAME
PCT/FR2007/051325 WO2007138218A1 (en) 2006-05-29 2007-05-24 Device for creating a printing plate and development process

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EP2021180A1 EP2021180A1 (en) 2009-02-11
EP2021180B1 true EP2021180B1 (en) 2011-11-30

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JP (1) JP5043101B2 (en)
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ES (1) ES2376914T3 (en)
FR (1) FR2901506B1 (en)
WO (1) WO2007138218A1 (en)

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US11267014B2 (en) 2019-03-29 2022-03-08 Airbus Operations Gmbh Device for lacquer transfer
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US11267014B2 (en) 2019-03-29 2022-03-08 Airbus Operations Gmbh Device for lacquer transfer
US11331688B2 (en) 2019-03-29 2022-05-17 Airbus Operations Gmbh Device for lacquer transfer
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US11504739B2 (en) 2019-03-29 2022-11-22 Airbus Operations Gmbh Device for lacquer transfer
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US11241708B2 (en) 2019-04-12 2022-02-08 Airbus Operations Gmbh Device for lacquer transfer

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CN101448643A (en) 2009-06-03
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WO2007138218A1 (en) 2007-12-06
EP2021180A1 (en) 2009-02-11
FR2901506B1 (en) 2011-02-11
ES2376914T3 (en) 2012-03-20
JP5043101B2 (en) 2012-10-10
FR2901506A1 (en) 2007-11-30

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