EP2007570B1 - Embossing device, such as a cylinder or a sleeve - Google Patents

Embossing device, such as a cylinder or a sleeve Download PDF

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Publication number
EP2007570B1
EP2007570B1 EP07731241A EP07731241A EP2007570B1 EP 2007570 B1 EP2007570 B1 EP 2007570B1 EP 07731241 A EP07731241 A EP 07731241A EP 07731241 A EP07731241 A EP 07731241A EP 2007570 B1 EP2007570 B1 EP 2007570B1
Authority
EP
European Patent Office
Prior art keywords
coating
cylinder
embossment
thickness
axis
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.)
Not-in-force
Application number
EP07731241A
Other languages
German (de)
French (fr)
Other versions
EP2007570A2 (en
Inventor
Chouaib Boukaftane
Hélène BIAVA
Christian Reinhart
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.)
MacDermid Graphics Solutions Europe SAS
Original Assignee
MacDermid Printing Solutions Europe SAS
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Filing date
Publication date
Application filed by MacDermid Printing Solutions Europe SAS filed Critical MacDermid Printing Solutions Europe SAS
Publication of EP2007570A2 publication Critical patent/EP2007570A2/en
Application granted granted Critical
Publication of EP2007570B1 publication Critical patent/EP2007570B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0717—Methods and means for forming the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0717—Methods and means for forming the embossments
    • B31F2201/072—Laser engraving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0725—Hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0728—Material

Definitions

  • the invention relates to an embossing device, such as a cylinder or sleeve, of the type comprising on its outer peripheral surface a embossing pattern in relief and recessed, intended to be reproduced on a flat and deformable substance, and a process for the manufacture of such an embossing device.
  • an embossing device such as a cylinder or sleeve, of the type comprising on its outer peripheral surface a embossing pattern in relief and recessed, intended to be reproduced on a flat and deformable substance, and a process for the manufacture of such an embossing device.
  • Devices of this type are already known, which comprise metal embossing cylinders provided with a relief pattern, the etching being carried out according to the knurling technique and it is therefore a relief obtained by plastic deformation of the metal of the cylinder. .
  • the object of the invention is to overcome these disadvantages of known embossing devices.
  • the figure 5 shows an embossing cylinder device 1 comprising a cylinder 2 which could be made of metal, for example steel, or a composite material, surrounded by a coating 3 whose outer surface comprises a pattern of relief zones 4 regularly distributed on the suburbs.
  • the coating 3 comprises a first resin base layer 5 covering the cylinder and an outer layer of main resin 6 which gives the relief.
  • the basic primer serves to protect the metal of the cylinder 2 against external aggression and to increase the adhesion of the main layer 6 to the cylinder.
  • the base resin layer covering the cylinder was cross-linked by exposure to ultraviolet and / or visible light and the main resin layer 6 serving as photoresist is applied to the primary layer 5 and then imaged with a mask for example a film made in situ or a CTP.
  • the main resin could also be applied directly to the metal by choosing an appropriate resin composition.
  • the process illustrated on the figure 1 provides the application of the resin indicated at 8 on the peripheral surface of the cylinder 2, the uniformity of the thickness of the layer is provided by means of a doctor blade 9 which extends over the entire length of the cylinder.
  • the resin is provided by a resin feeder, denoted 10, which is movable in the axial direction of the cylinder 2, as indicated by the arrow F1.
  • the feed device essentially comprises a reservoir 11 and a tubular element 12 of the resin 8, the displacement means of the assembly 10 formed by the reservoir 11 and the tube 12 can be of any kind known per se.
  • the resin 8 is applied to the face of the cylinder 2 just above the doctor blade 9, by rotating the cylinder in the direction of the arrow F2 and by moving the feeding device 10 in the axial direction as indicated by the arrow F1. It is the doctor blade 9 defining between it and the peripheral surface a slot of a predetermined width and uniform over the length of the cylinder which ensures a uniform thickness of the coating which will subsequently be treated to have the embossing pattern.
  • the figure 2 illustrates another embodiment of the method according to the invention, whose particularity lies in the fact that it uses, in place of the doctor blade 9 of the first embodiment, a pressure roller 14 which moves parallel to the axis of the cylinder in both directions, as indicated by the arrow F3.
  • the resin feed device 10 which is of the same nature as the figure 1 moves as before, according to the arrow F1.
  • the rectilinear axial movements of the doctor blade 14, which is rotatable in the cylinder 2 and the axial rectilinear axis of the feed device 10, have the following meanings: result that the resin is deposited and uniformized as to the thickness of the resin layer on the peripheral surface of the cylinder according to the helical line 15 shown in FIG. figure 2 .
  • the figure 3 shows a third embodiment of the invention which uses as equalizing member of the thickness of the resin layer on the cylinder 2 another rotating cylinder 17 which serves as a counter cylinder whose axis of rotation is parallel to the axis of rotation of the carrier cylinder of the embossing layer but which is laterally displaceable so that the deviation ⁇ l of the axes of the cylinders 2 and 17 is variable.
  • the relative displacement of the counter-cylinder 17 makes it possible to establish between this cylinder and the cylinder 2 carrying the resin layer a slot 18 of a predetermined width, which determines the thickness of the resin layer, the feed device resin 10 applying the resin on the peripheral surface of the cylinder 2 at a location just upstream of the slot.
  • the cylinder 17 rotates in the direction of the arrow F4, that is to say in the same direction as the cylinder 2.
  • the figure 4 illustrates yet another embodiment of the method according to the invention, which is different from that shown on the figure 3 by the nature of the device for applying the resin.
  • the resin is applied to the peripheral surface of the cylinder 2 by bubbling in a resin bath 20 which extends over the entire length of the cylinder and into which part of the periphery engages to a predetermined depth so that, when the passing of the periphery of the cylinder by this bath, resin adheres to this surface, the thickness of the applied resin layer being determined by the width 1 of the slot 18 existing between the cylinder 2 and the counter-cylinder 17.
  • the production of the embossing is obtained by liquid or pasty hot before crosslinking intended to produce the embossing pattern.
  • a type of resin which is based on pokyester, polyether, polyurethane, or other, or combinations, urethane or the like.
  • the reactive groups are epoxy, (ME) acrylates, oxetanes, vinyl ether, allowing radical or cationic photopolymerization.
  • the resin will be selected so that it is compatible with a temperature of at least 140 ° C. after the complete crosslinking, a double crosslinking system to be possible and a possible post-cooking if necessary.
  • the possibility of incorporating fillers and / or flexibilizers into the resin to modify the rheology and the physical properties is provided.
  • the resin is advantageously usable in a structural composite based on glass or carbon fibers, and a combination with layers of other materials or fibrous reinforcements by means of specialized adhesive must be possible.
  • the Young's modulus is between 800 and 2000 and preferably greater than 1500 MPa. Wear resistance is high, such as impact resistance and mechanical overload. Another requirement relates to the absence of static electricity generation by contact or friction.
  • the resin must provide an anti-adherence surface, that is to say, there must be no accumulation of particles in contact during operation.
  • the coating composition will be deposited at a thickness of 0.1 to 2 mm, crosslinkable in its mass deposited endlessly.
  • the composition could be applied in a higher crosslinkable thickness in two or more times and it is then necessary to provide a system that promotes interlocking between the layers.
  • the relief of the embossing layer can be developed by means of, for example, a mask and ultraviolet light having a wavelength of, for example, 370 nm.
  • the relief has a depth of 0.2 to 1.2 mm or more if on two levels.
  • a relief at more than one level is achievable by means of superimposed layers containing photoinitiators absorbing in different regions, complementary masses per level and intercalated filters.
  • the relief is developable at an intermediate stage of crosslinking of the resin, for example less than one minute of exposure.
  • the composition has a hardness greater than 75 Shore D and an elastic modulus greater than 1000 MPa at room temperature and remaining greater than 500 MPa up to 80 ° C.
  • the composition has elastic and mechanical characteristics compatible with loads greater than 100 Kg / cml and speeds greater than 100 m / min.
  • the resin is resistant to shocks and abrasion and can reproduce embossing but also complexing or laminating locally on a non-multilayered non-matted fabric or not based on an elastomeric counterpart of a hardness between 50 and 70 Shore A. surface after photopolymerization and cleaning has sufficient anti-adherence to paper lint to prevent further fouling in operation.
  • photopolymer formulas which can be used in the context of the invention for low-viscosity compositions based on resin with dynamic properties and abrasive behavior, applicable to embossing, but which can be applied, will be given as non-limiting examples. also for composite reinforcements with fabric or non-woven glass.
  • the composition comprises 100 parts by weight of polyurethane acrylate, oligomer type polyether, polyester urethane diacrylate aliphatic such as marketed under the name CN981 by the company Cray Valley, 25 parts by weight of a triacrylate monomer: Tris (2- hydroxy ethyl) Isocyanurate triacrylate, type SR 368 marketed by Cray Valley, and an acyl phosphine photoinitiator such as BaPO, Irgacure 819, TPO Darocure, in a proportion of 0.05% to 2% by weight of the photopolymer.
  • polyurethane acrylate oligomer type polyether
  • polyester urethane diacrylate aliphatic such as marketed under the name CN981 by the company Cray Valley
  • Tris (2- hydroxy ethyl) Isocyanurate triacrylate type SR 368 marketed by Cray Valley
  • an acyl phosphine photoinitiator such
  • This formula is crosslinkable in thickness from 0.1 to 3 mm in iUT light with a peak around 380 nm. According to another formula, there is added to the formula which has just been given respectively from 3 to 10 parts by weight of silica submicroscopic pyrogenation (200 m 2 / g).
  • the photopolymer system in particular for rigid support, comprises 50 parts by weight of a polyurethane oligomer of the CN981 type, 50 parts by weight of an epoxy acrylate oligomer, bis phenol A difunctional acrylate of the CN 104 Cray type. Valley, 10 parts by weight of a SR 368 type trifunctional monomer, and a monomer triacrylate, acid-type adhesion promoter such as Cray Valley SR9051, which provides a metal-bonded or thermally crosslinked epoxy composite bonding.
  • Another formula comprises 50 parts by weight of CN981, 50 parts by weight of CN104, 20 parts by weight of SR368, 5 parts by weight of SR 9051 and a photoinitiator marketed under the name BAPO at a level of 0.05% by weight of photocomposition.
  • a resin with a mono or bidirectional glass woven reinforcement radiation crosslinkable in 0.3 to 2 mm thick usable in a composite sleeve for supporting endless printer shapes or elastomer replacing cylinders in industrial application.
  • Another formula could then include 50 parts in weight of CN981, 50 parts by weight of CN104, tricyclodecane dimethanol diacrylate monomer of the type sold by Sartomer under the name 833s and 0.1% by weight of the photocomposition of the BAPO photoinitiator.
  • the formulated photopolymer ensures a good compromise with respect to the static charges and anti-adhesion with respect to the substrate to be embossed. It is sufficiently transparent to light and can react at depths of 0.4 to 2 mm to light through a radical or cationic process.
  • the invention involves a system of adhesion of this photopolymer on metal or epoxy composite loaded with glass or other, for example carbon or aramid.
  • the invention provides for the use of a highly viscous and non-tacky resin at an ambient temperature and which can be carried out by casting at a temperature below 80 ° C.
  • a regular endless deposition of this composition is obtained on a support of known diameter, which can be fixed or rotating according to the viscosity characteristics of the composition.
  • This deposit may have a thickness of +/- 1/100 on cylindrical tables up to 4 meters long and 800 mm in diameter on average.
  • Several layers with one or two photopolymerization steps can be made with two types of photoinitiators at different wavelengths at two levels in relief height or two module levels between lamination zones and impression zone. There is thus the possibility of making a full underlayer of higher modulus, possibly diffusing the light or absorbent to influence the shape of the relief.
  • the invention provides the possibility of a deposit of a mask endlessly by a digital method, to direct drawing by jet of wax or ink, or ablated following pattern after a uniform deposit of the mask.
  • the etching may be direct with an IR laser to ablate what is not the relief or the direct creation of the relief by photochemical light in visible or ultraviolet light with leaching of the residual resin thermally or solvent, the light is advantageously d preferably a wavelength between 395 and 410 nm, with cationic polymerization with or without sensitizer at the chosen wavelength or radical, for a positive relief pattern.
  • This case also makes it possible to work with liquid resins at ambient temperatures.
  • the use of a violet to blue laser light diode makes it possible to limit the cost of purchasing and maintaining the laser system on specific equipment.
  • the invention makes it possible to obtain a precise relief in depth, of shape adjusted for example in slope for a good mechanical anchoring. It is possible to adjust the land anchorage by a slope by the introduction of specific ingredients, the reflectivity / absorption of the substrate or, in the case of a laser beam, by adjustment of this beam.
  • the invention provides equipment to perform in endless all steps except the final cleaning.
  • the production time on this equipment is less than 4 hours, the light-curing portion remaining less than half an hour.
  • the invention thus provides a process which does not require final machining, however, in ensuring a dimensional tolerance with +/- 2/100 th of etching a smooth surface and promoting anti-adhesion vis-à-vis the scrap fibers paper.
  • embossing rolls whose outer layer embossed to produce the impression in the substance to be deformed is formed by a resin based on epoxy, urethane or similar, which makes the embossing rollers according to the invention perfectly suitable when it comes to frequently renew collections and make limited edition prints.
  • the embossing relief can be easily achieved using UV-visible laser or for example by non-coherent UV-visible light.
  • the invention is applicable to the embossing of paper or wallpaper, cellulose wadding, films and leathers, multi-layered complex packaging, marking and grooving of paper and packaging, gilding and processes. assimilated and the like.
  • the invention provides considerable advantages, such as the speed and simplicity of embossing rolls and the reduction of energy and handling.
  • the application of a coating layer of uniform thickness as described and shown in the figures, on a rotating cylinder makes it possible to obtain a cylindrical piece provided with a photopolymer layer having a thickness between 0.1 and 3 mm.
  • the photopolymer layer is crosslinkable especially in ultraviolet light at wavelengths between 350 mm and 405 mm, with an insolation time between 10 seconds and 1 minute.
  • This crosslinking mode can be used in rotation or in rotation and longitudinal displacement of the support of the cylindrical piece or in rotation of the cylindrical piece and longitudinal displacement of the irradiation system.
  • the photopolymer layer, reinforced or not, and calibrated can be made on a cylinder or on a metal sleeve or on a composite sleeve fitted on a cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

L'invention concerne un dispositif de gaufrage, tel qu'un cylindre ou manchon, du type comportant sur sa surface périphérique externe un motif de gaufrage en relief et en creux, destiné à être reproduit sur une substance plane et déformable, ainsi qu'un procédé pour la fabrication d'un tel dispositif de gaufrage.The invention relates to an embossing device, such as a cylinder or sleeve, of the type comprising on its outer peripheral surface a embossing pattern in relief and recessed, intended to be reproduced on a flat and deformable substance, and a process for the manufacture of such an embossing device.

On connaît déjà des dispositifs de ce type, qui comportent des cylindres gaufreurs métalliques pourvus d'un motif en relief, la gravure étant réalisée selon la technique de moletage et il s'agit donc d'un relief obtenu par déformation plastique du métal du cylindre.Devices of this type are already known, which comprise metal embossing cylinders provided with a relief pattern, the etching being carried out according to the knurling technique and it is therefore a relief obtained by plastic deformation of the metal of the cylinder. .

Il est également connu d'utiliser à la place du moletage purement mécanique la technologie de moletage de type mécano-chimique.It is also known to use instead of purely mechanical knurling the knurling technology of the mechano-chemical type.

Il est encore connu de prévoir sur le cylindre un revêtement dur polymérique et de réaliser le relief à l'aide d'un laser. Voir par exemple le document US 2002/0142143 .It is still known to provide on the cylinder a polymeric hard coating and to achieve the relief with the aid of a laser. See for example the document US 2002/0142143 .

Or, dans le domaine d'application de gaufrage, le renouvellement des collections et les tirages en série limités engendrent un besoin grandissant de dessins faisant naître des nouvelles exigences, à savoir un coût réduit et une plus grande rapidité de réalisation des dessins de gaufrage. Inversement, la durée de vie attendue en terme de métrage réalisé peut être réduite.However, in the field of embossing application, the renewal of collections and limited series draws generate a growing need for drawings that create new requirements, namely a reduced cost and faster completion of embossing designs. Conversely, the expected life in terms of realized footage can be reduced.

Les dispositifs de gaufrage connus, en raison de leur procédé de fabrication coûteux et complexe, ne sont pas en mesure à satisfaire à ces exigences.Known embossing devices, because of their expensive and complex manufacturing process, are not able to meet these requirements.

L'invention a pour but de palier ces inconvénients des dispositifs de gaufrage connus.The object of the invention is to overcome these disadvantages of known embossing devices.

Ce but est atteint par le dispositif de gaufrage selon la revendication 1 et par le procédé de réalisation dudit dispositif selon la revendication 13.This object is achieved by the embossing device according to claim 1 and by the method of producing said device according to claim 13.

L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant plusieurs modes de réalisation de l'invention et dans lesquels :

  • les figures 1 à 4 illustrent quatre modes de réalisation du procédé de fabrication d'un dispositif de cylindre de gaufrage selon l'invention ; et
  • la figure 5 est une vue en perspective d'un dispositif de cylindre de gaufrage selon l'invention.
The invention will be better understood and other objects, features, details and advantages thereof will appear more clearly in the following explanatory description made with reference to the accompanying schematic drawings given solely by way of example illustrating several modes. embodiments of the invention and in which:
  • the Figures 1 to 4 illustrate four embodiments of the method of manufacturing an embossing roll device according to the invention; and
  • the figure 5 is a perspective view of an embossing cylinder device according to the invention.

La figure 5 montre un dispositif de cylindre de gaufrage 1 comportant un cylindre 2 qui pourrait être en métal, par exemple en acier, ou en un matériau composite, entouré d'un revêtement 3 dont la surface extérieure comporte un motif de zones en relief 4 régulièrement réparti sur la périphérie. Il est avantageux que le revêtement 3 comporte une première couche de base de résine 5 recouvrant le cylindre et une couche extérieure de résine principale 6 qui donne le relief. La couche primaire de base a pour fonction de protéger le métal du cylindre 2 contre des agressions extérieures et d'augmenter l'adhésion de la couche principale 6 sur le cylindre. La couche de résine de base recouvrant le cylindre a été réticulée par exposition à la lumière ultraviolette et/ou visible et la couche de résine principale 6 servant de photorésist est appliquée sur la couche primaire 5 et ensuite imagée à l'aide d'un masque, par exemple un film réalisé in situ ou d'un CTP. Bien entendu, la résine principale pourrait aussi être appliquée directement sur le métal en choisissant une composition de résine appropriée.The figure 5 shows an embossing cylinder device 1 comprising a cylinder 2 which could be made of metal, for example steel, or a composite material, surrounded by a coating 3 whose outer surface comprises a pattern of relief zones 4 regularly distributed on the suburbs. It is advantageous that the coating 3 comprises a first resin base layer 5 covering the cylinder and an outer layer of main resin 6 which gives the relief. The basic primer serves to protect the metal of the cylinder 2 against external aggression and to increase the adhesion of the main layer 6 to the cylinder. The base resin layer covering the cylinder was cross-linked by exposure to ultraviolet and / or visible light and the main resin layer 6 serving as photoresist is applied to the primary layer 5 and then imaged with a mask for example a film made in situ or a CTP. Of course, the main resin could also be applied directly to the metal by choosing an appropriate resin composition.

En se référant aux figures 1 à 4, on décrira ci-après quatre modes d'application de la couche de résine principale 6, l'application pouvant se faire directement sur le cylindre 2 ou sur une couche intermédiaire telle que la couche primaire 5.Referring to Figures 1 to 4 , four modes of application of the main resin layer 6 will be described below, the application being able to be done directly on the cylinder 2 or on an intermediate layer such as the primary layer 5.

Le procédé illustré sur la figure 1 prévoit l'application de la résine indiquée en 8 sur la surface périphérique du cylindre 2, l'uniformité de l'épaisseur de la couche est assurée à l'aide d'une racle 9 qui s'étend sur toute la longueur du cylindre. La résine est fournie par un dispositif d'alimentation en résine, notée 10, qui est déplaçable dans la direction axiale du cylindre 2, comme cela est indiqué par la flèche F1. Le dispositif d'alimentation comporte essentiellement un réservoir 11 et un élément tubulaire 12 de sortie de la résine 8, les moyens de déplacement de l'ensemble 10 formé par le réservoir 11 et le tube 12 pouvant être de toute nature connue en soi.The process illustrated on the figure 1 provides the application of the resin indicated at 8 on the peripheral surface of the cylinder 2, the uniformity of the thickness of the layer is provided by means of a doctor blade 9 which extends over the entire length of the cylinder. The resin is provided by a resin feeder, denoted 10, which is movable in the axial direction of the cylinder 2, as indicated by the arrow F1. The feed device essentially comprises a reservoir 11 and a tubular element 12 of the resin 8, the displacement means of the assembly 10 formed by the reservoir 11 and the tube 12 can be of any kind known per se.

Il ressort de la figure que, pour la réalisation du revêtement 6, on applique la résine 8 à la face du cylindre 2 juste au-dessus de la racle 9, en faisant tourner le cylindre dans la direction de la flèche F2 et en déplaçant le dispositif d'alimentation 10 en direction axiale tel qu'indiqué par la flèche F1. C'est la racle 9 en définissant entre elle et la surface périphérique une fente d'une largeur prédéterminée et uniforme sur la longueur du cylindre qui assure une épaisseur uniforme du revêtement qui sera ultérieurement traité pour avoir le motif de gaufrage.It emerges from the figure that, for the realization of the coating 6, the resin 8 is applied to the face of the cylinder 2 just above the doctor blade 9, by rotating the cylinder in the direction of the arrow F2 and by moving the feeding device 10 in the axial direction as indicated by the arrow F1. It is the doctor blade 9 defining between it and the peripheral surface a slot of a predetermined width and uniform over the length of the cylinder which ensures a uniform thickness of the coating which will subsequently be treated to have the embossing pattern.

La figure 2 illustre un autre mode de réalisation du procédé selon l'invention, dont la particularité réside dans le fait qu'il utilise, à la place de la racle 9 du premier mode de réalisation, un galet presseur 14 qui se déplace parallèlement à l'axe du cylindre dans les deux sens, comme cela est indiqué par la flèche F3. Par contre, le dispositif d'alimentation en résine 10 qui est de la même nature qu'à la figure 1 se déplace comme auparavant, conformément à la flèche F1. Les mouvements rectiligne axial de la racle 14, rotatif du cylindre 2 et rectiligne axial du dispositif d'alimentation 10 ont pour résultat que la résine est déposée et uniformisée quant à l'épaisseur de la couche de résine sur la surface périphérique du cylindre selon la ligne hélicoïdale 15 représentée sur la figure 2.The figure 2 illustrates another embodiment of the method according to the invention, whose particularity lies in the fact that it uses, in place of the doctor blade 9 of the first embodiment, a pressure roller 14 which moves parallel to the axis of the cylinder in both directions, as indicated by the arrow F3. On the other hand, the resin feed device 10 which is of the same nature as the figure 1 moves as before, according to the arrow F1. The rectilinear axial movements of the doctor blade 14, which is rotatable in the cylinder 2 and the axial rectilinear axis of the feed device 10, have the following meanings: result that the resin is deposited and uniformized as to the thickness of the resin layer on the peripheral surface of the cylinder according to the helical line 15 shown in FIG. figure 2 .

La figure 3 montre un troisième mode de réalisation de l'invention qui utilise comme organe d'égalisation de l'épaisseur de la couche de résine sur le cylindre 2 un autre cylindre rotatif 17 qui sert de contre-cylindre dont l'axe de rotation est parallèle à l'axe de rotation du cylindre porteur de la couche de gaufrage mais qui est latéralement déplaçable de façon que l'écart Δl des axes des cylindres 2 et .17 soit variable. Le déplacement relatif du contre-cylindre 17 permet d'établir entre ce cylindre et le cylindre 2 porteur de la couche de résine une fente 18 d'une largeur prédéterminée, qui détermine l'épaisseur de la couche de résine, le dispositif d'alimentation en résine 10 appliquant la résine sur la surface périphérique du cylindre 2 à un endroit juste en amont de la fente. Il est à noter que le cylindre 17 tourne dans le sens de la flèche F4, c'est-à-dire dans le même sens que le cylindre 2.The figure 3 shows a third embodiment of the invention which uses as equalizing member of the thickness of the resin layer on the cylinder 2 another rotating cylinder 17 which serves as a counter cylinder whose axis of rotation is parallel to the axis of rotation of the carrier cylinder of the embossing layer but which is laterally displaceable so that the deviation Δl of the axes of the cylinders 2 and 17 is variable. The relative displacement of the counter-cylinder 17 makes it possible to establish between this cylinder and the cylinder 2 carrying the resin layer a slot 18 of a predetermined width, which determines the thickness of the resin layer, the feed device resin 10 applying the resin on the peripheral surface of the cylinder 2 at a location just upstream of the slot. It should be noted that the cylinder 17 rotates in the direction of the arrow F4, that is to say in the same direction as the cylinder 2.

La figure 4 illustre encore un autre mode de réalisation du procédé selon l'invention, qui se distingue de celui montré sur la figure 3 par la nature du dispositif d'application de la résine. Dans le cas de la figure 4, la résine est appliquée à la surface périphérique du cylindre 2 par barbotage dans un bain de résine 20 qui s'étend sur toute la longueur du cylindre et dans lequel s'engage une partie de la périphérie à une profondeur prédéterminée si bien que, lors du passage de la périphérie du cylindre par ce bain, de la résine adhère à cette surface, l'épaisseur de la couche de résine appliquée étant déterminée par la largeur 1 de la fente 18 existant entre le cylindre 2 et le contre-cylindre 17.The figure 4 illustrates yet another embodiment of the method according to the invention, which is different from that shown on the figure 3 by the nature of the device for applying the resin. In the case of figure 4 the resin is applied to the peripheral surface of the cylinder 2 by bubbling in a resin bath 20 which extends over the entire length of the cylinder and into which part of the periphery engages to a predetermined depth so that, when the passing of the periphery of the cylinder by this bath, resin adheres to this surface, the thickness of the applied resin layer being determined by the width 1 of the slot 18 existing between the cylinder 2 and the counter-cylinder 17.

Il ressort des différentes possibilités de mise en oeuvre de l'invention que la réalisation de la couche de gaufrage est obtenue par voie liquide ou pâteuse à chaud avant la réticulation destinée à produire le motif de gaufrage. De façon générale, on utilise un type de résine qui est à base de pokyester, polyéther, polyuréthane, ou autre, ou combinaisons, uréthane ou similaire. Les groupes réactifs sont époxy, (ME) acrylates, oxetanes, vinyléther, permettant une photopolymérisation par voie radicalaire ou cationique. La résine sera choisie de façon qu'elle soit compatible avec une température de 140°C au moins après la réticulation complète, un double système de réticulation devant être possible et une post-cuisson envisageable si nécessaire. La possibilité d'incorporation de charges et/ou de flexibilisants dans la résine pour modifier la rhéologie et les propriétés physiques est prévue. La résine est avantageusement utilisable dans un composite structural à base de fibres de verre ou de carbone, et une combinaison avec des couches d'autres matériaux ou des renforts fibreux par intermédiaire d'adhésif spécialisé doit être possible.It emerges from the different possibilities of implementing the invention that the production of the embossing is obtained by liquid or pasty hot before crosslinking intended to produce the embossing pattern. In general, one uses a type of resin which is based on pokyester, polyether, polyurethane, or other, or combinations, urethane or the like. The reactive groups are epoxy, (ME) acrylates, oxetanes, vinyl ether, allowing radical or cationic photopolymerization. The resin will be selected so that it is compatible with a temperature of at least 140 ° C. after the complete crosslinking, a double crosslinking system to be possible and a possible post-cooking if necessary. The possibility of incorporating fillers and / or flexibilizers into the resin to modify the rheology and the physical properties is provided. The resin is advantageously usable in a structural composite based on glass or carbon fibers, and a combination with layers of other materials or fibrous reinforcements by means of specialized adhesive must be possible.

Concernant les propriétés physiques de la résine pure, elle a une ténacité la plus élevée possible. Le module de Young est compris entre 800 et 2000 et, de préférence supérieur à 1 500 MPa. La résistance à l'usure est élevée, comme la résistance aux chocs et surcharges mécaniques. Une autre exigence concerne l'absence de génération d'électricité statique par contact ou par frottement. La résine doit assurer une anti-adhérence en surface, c'est-à-dire, il faut qu'il y ait absence d'accumulation de particules en contact lors du fonctionnement.Regarding the physical properties of pure resin, it has the highest toughness possible. The Young's modulus is between 800 and 2000 and preferably greater than 1500 MPa. Wear resistance is high, such as impact resistance and mechanical overload. Another requirement relates to the absence of static electricity generation by contact or friction. The resin must provide an anti-adherence surface, that is to say, there must be no accumulation of particles in contact during operation.

Concernant la composition photopolymère à appliquer en revêtement au cylindre métallique ou au manchon composite cylindrique, dont la photopolymérisation pourra être réalisée grâce à un système radicalaire (UV ou visible) ou cationique, elle a une viscosité permettant une enduction entre 40°C et 60°C. La composition de revêtement sera déposée à une épaisseur de 0,1 à 2 mm, réticulable dans sa masse déposée en sans fin. La composition pourrait être appliquée en une épaisseur supérieure réticulable en deux fois ou plus et il faut alors prévoir un système favorisant l'accrochage entre les couches. Le relief de la couche de gaufrage est développable au moyen par exemple d'un masque et de lumière ultraviolette d'une longueur d'onde par exemple de 370 nm. Le relief a une profondeur de 0,2 à 1,2 mm ou plus si sur deux niveaux.Regarding the photopolymer composition to be coated with the metal cylinder or the cylindrical composite sleeve, the photopolymerization of which may be carried out by means of a radical system (UV or visible) or cationic, it has a viscosity allowing a coating between 40 ° C and 60 ° vs. The coating composition will be deposited at a thickness of 0.1 to 2 mm, crosslinkable in its mass deposited endlessly. The composition could be applied in a higher crosslinkable thickness in two or more times and it is then necessary to provide a system that promotes interlocking between the layers. The relief of the embossing layer can be developed by means of, for example, a mask and ultraviolet light having a wavelength of, for example, 370 nm. The relief has a depth of 0.2 to 1.2 mm or more if on two levels.

Un relief à plus d'un niveau est réalisable au moyen de couches superposées contenant des photoinitiateurs absorbant dans des régions différentes, des masses complémentaires par niveau et des filtres intercalés. Le relief est développable à un stade intermédiaire de réticulation de la résine, par exemple inférieur à une minute d'exposition.A relief at more than one level is achievable by means of superimposed layers containing photoinitiators absorbing in different regions, complementary masses per level and intercalated filters. The relief is developable at an intermediate stage of crosslinking of the resin, for example less than one minute of exposure.

La composition a une dureté supérieure à 75 shore D et un module élastique supérieur à 1000 MPa à la température ambiante et restant supérieur à 500 MPa jusqu'à 80°C. La composition a des caractéristiques élastiques et mécaniques compatibles avec des charges supérieures à 100 Kg/cml et des vitesses supérieures à 100 m/mn. La résine est résistante aux chocs et à l'abrasion et peut reproduire un gaufrage mais également complexage ou contrecollage localement sur un non tissu multicouche emmêlé ou non en s'appuyant sur une contrepartie élastomère d'une dureté entre 50 et 70 Shore A. La surface après photopolymérisation et nettoyage présente suffisamment d'anti-adhérence vis-â-vis des peluches de papier pour empêcher un encrassement ultérieur en fonctionnement.The composition has a hardness greater than 75 Shore D and an elastic modulus greater than 1000 MPa at room temperature and remaining greater than 500 MPa up to 80 ° C. The composition has elastic and mechanical characteristics compatible with loads greater than 100 Kg / cml and speeds greater than 100 m / min. The resin is resistant to shocks and abrasion and can reproduce embossing but also complexing or laminating locally on a non-multilayered non-matted fabric or not based on an elastomeric counterpart of a hardness between 50 and 70 Shore A. surface after photopolymerization and cleaning has sufficient anti-adherence to paper lint to prevent further fouling in operation.

On donnera ci-après, à titre d'exemple non limitatif des formules photopolymères utilisables dans le cadre de l'invention pour des compositions de faible à haute viscosité, à base de résine à propriété dynamique et tenue abrasive, applicable au gaufrage, mais applicable également pour des renforts composites avec tissu ou non tissé de verre. Selon une formule, la composition comporte 100 parties en poids de polyuréthane acrylate, oligomère type polyéther, polyester uréthane diacrylate aliphatique tel que commercialisés sous la dénomination CN981 par la société Cray Valley, 25 parties en poids d'un monomètre triacrylate : Tris(2-hydroxy éthyl) Isocyanurate triacrylate, type SR 368 commercialisé par Cray Valley, et un photoinitiateur type acyle phosphine comme BaPO, irgacure 819, TPO Darocure, à raison de 0,05% à 2% en poids du photopolymère. Cette formule est réticulable en épaisseur de 0,1 à 3 mm en lumière iUT avec un pic autour de 380 nm. Selon une autre formule, on additionne à la formule qui vient d'être donnée respectivement de 3 à 10 parties en poids en silice de pyrogénation submicroscopique (200 m2/g).The photopolymer formulas which can be used in the context of the invention for low-viscosity compositions based on resin with dynamic properties and abrasive behavior, applicable to embossing, but which can be applied, will be given as non-limiting examples. also for composite reinforcements with fabric or non-woven glass. According to a formula, the composition comprises 100 parts by weight of polyurethane acrylate, oligomer type polyether, polyester urethane diacrylate aliphatic such as marketed under the name CN981 by the company Cray Valley, 25 parts by weight of a triacrylate monomer: Tris (2- hydroxy ethyl) Isocyanurate triacrylate, type SR 368 marketed by Cray Valley, and an acyl phosphine photoinitiator such as BaPO, Irgacure 819, TPO Darocure, in a proportion of 0.05% to 2% by weight of the photopolymer. This formula is crosslinkable in thickness from 0.1 to 3 mm in iUT light with a peak around 380 nm. According to another formula, there is added to the formula which has just been given respectively from 3 to 10 parts by weight of silica submicroscopic pyrogenation (200 m 2 / g).

Selon une autre formule, le système photopolymère notamment pour accrochage sur support rigide comporte 50 parties en poids d'un oligomère polyuréthane du type CN981, 50 parties en poids d'un oligomère époxy acrylate, bis phénol A acrylate difonctionnel du type CN 104 de Cray Valley, 10 parties en poids d'un monomère trifonctionnel du type SR 368, et un monomère triacrylate, promoteur d'adhésion du type acide comme le SR9051 de Cray Valley, qui assure un accrochage sur base métallique ou composite époxy réticulé thermiquement.According to another formula, the photopolymer system, in particular for rigid support, comprises 50 parts by weight of a polyurethane oligomer of the CN981 type, 50 parts by weight of an epoxy acrylate oligomer, bis phenol A difunctional acrylate of the CN 104 Cray type. Valley, 10 parts by weight of a SR 368 type trifunctional monomer, and a monomer triacrylate, acid-type adhesion promoter such as Cray Valley SR9051, which provides a metal-bonded or thermally crosslinked epoxy composite bonding.

Une autre formule comporte 50 parties en poids de CN981, 50 parties en poids de CN104, 20 parties en poids de SR368, 5 parties en poids de SR 9051 et un photoinitiateur commercialisé sous la dénomination BAPO à hauteur de 0,05% en poids de la photocomposition.Another formula comprises 50 parts by weight of CN981, 50 parts by weight of CN104, 20 parts by weight of SR368, 5 parts by weight of SR 9051 and a photoinitiator marketed under the name BAPO at a level of 0.05% by weight of photocomposition.

Dans le cadre de l'invention, on utilise également une résine avec renfort de tissé de verre mono ou bidirectionnel, réticulable par radiation en 0,3 à 2 mm d'épaisseur, utilisable en manchon composite pour support de formes imprimantes sans fin ou d'élastomère en remplacement de cylindres en application industrielle. Une autre formule pourrait alors comprendre 50 parties en poids de CN981, 50 parties en poids de CN104, du monomère tricyclodécane diméthanol diacrylate du type commercialisé par la société Sartomer sous la dénomination 833s et 0,1% en poids de la photocomposition du photoinitiateur BAPO.In the context of the invention, use is also made of a resin with a mono or bidirectional glass woven reinforcement radiation crosslinkable in 0.3 to 2 mm thick, usable in a composite sleeve for supporting endless printer shapes or elastomer replacing cylinders in industrial application. Another formula could then include 50 parts in weight of CN981, 50 parts by weight of CN104, tricyclodecane dimethanol diacrylate monomer of the type sold by Sartomer under the name 833s and 0.1% by weight of the photocomposition of the BAPO photoinitiator.

Il ressort de la description de l'invention qui vient d'être faite, que celle-ci implique la mise au point d'une photocomposition de module déterminée et ajustée en fonction des exigences de l'application. Le photopolymère formulé assure un bon compromis vis-à-vis des charges statiques et d'anti-adhérence vis-à-vis du substrat à gaufrer. Il est suffisamment transparent à la lumière et peut réagir sur des profondeurs de 0,4 à 2 mm à la lumière par le biais d'un processus radicalaire ou cationique. L'invention implique un système d'adhérisation de ce photopolymère sur métal ou sur composite époxy chargé de verre ou autre, par exemple le carbone ou aramide. L'invention prévoit l'utilisation d'une résine très visqueuse et non pégueuse à une température ambiante et pouvant se mettre en oeuvre par coulée à une température inférieure à 80°C. Grâce à l'invention, on obtient un dépôt régulier sans fin de cette composition sur un support de diamètre connu, qui peut être fixe ou en rotation suivant les caractéristiques de viscosité de la composition. Ce dépôt peut avoir une épaisseur de +/- 1/100 sur des tables cylindriques jusqu'à 4 mètres de long et 800 mm de diamètre en moyenne. Plusieurs couches à une ou deux étapes de photopolymérisation peuvent être réalisées avec deux types de photoamorceurs à différentes longueurs d'ondes à deux niveaux en hauteur de relief ou deux niveaux de module entre zones de contre-collage et zone d'empreinte. Il y a ainsi la possibilité de faire une sous-couche pleine de plus haut module, éventuellement diffusant la lumière ou absorbante pour influencer la forme du relief. L'invention prévoit la possibilité d'un dépôt d'un masque en sans fin par un procédé digital, à dessin direct par jet de cire ou encre, ou ablaté suivant motif après un dépôt uniforme du masque. La gravure peut être directe avec un laser IR pour ablater ce qui n'est pas le relief ou la création directe du relief par voie photochimique en lumière visible ou ultraviolette avec lessivage de la résine résiduelle par voie thermique ou solvant, la lumière étant avantageusement d'une longueur d'onde de préférence entre 395 et 410 nm, avec polymérisation cationique avec ou sans sensibilisateur à la longueur d'onde choisie ou radicalaire, pour un dessin en relief positif. Ce cas permet en outre de travailler avec des résines liquides à des températures ambiantes. L'utilisation d'une diode laser de lumière violette à bleue permet de limiter le coût d'achat et d'entretien du système laser sur un équipement spécifique. L'invention permet l'obtention d'un relief précis en profondeur, de forme ajustée par exemple en pente pour un bon ancrage mécanique. Il est possible d'ajuster l'ancrage du relief par une pente grâce à l'introduction d'ingrédients spécifiques, de la réflectivité/absorption du substrat ou, dans le cas d'un faisceau à laser, par ajustement de ce faisceau.It follows from the description of the invention which has just been made that this involves the development of a determined module photocomposition and adjusted according to the requirements of the application. The formulated photopolymer ensures a good compromise with respect to the static charges and anti-adhesion with respect to the substrate to be embossed. It is sufficiently transparent to light and can react at depths of 0.4 to 2 mm to light through a radical or cationic process. The invention involves a system of adhesion of this photopolymer on metal or epoxy composite loaded with glass or other, for example carbon or aramid. The invention provides for the use of a highly viscous and non-tacky resin at an ambient temperature and which can be carried out by casting at a temperature below 80 ° C. Thanks to the invention, a regular endless deposition of this composition is obtained on a support of known diameter, which can be fixed or rotating according to the viscosity characteristics of the composition. This deposit may have a thickness of +/- 1/100 on cylindrical tables up to 4 meters long and 800 mm in diameter on average. Several layers with one or two photopolymerization steps can be made with two types of photoinitiators at different wavelengths at two levels in relief height or two module levels between lamination zones and impression zone. There is thus the possibility of making a full underlayer of higher modulus, possibly diffusing the light or absorbent to influence the shape of the relief. The invention provides the possibility of a deposit of a mask endlessly by a digital method, to direct drawing by jet of wax or ink, or ablated following pattern after a uniform deposit of the mask. The etching may be direct with an IR laser to ablate what is not the relief or the direct creation of the relief by photochemical light in visible or ultraviolet light with leaching of the residual resin thermally or solvent, the light is advantageously d preferably a wavelength between 395 and 410 nm, with cationic polymerization with or without sensitizer at the chosen wavelength or radical, for a positive relief pattern. This case also makes it possible to work with liquid resins at ambient temperatures. The use of a violet to blue laser light diode makes it possible to limit the cost of purchasing and maintaining the laser system on specific equipment. The invention makes it possible to obtain a precise relief in depth, of shape adjusted for example in slope for a good mechanical anchoring. It is possible to adjust the land anchorage by a slope by the introduction of specific ingredients, the reflectivity / absorption of the substrate or, in the case of a laser beam, by adjustment of this beam.

L'invention prévoit un équipement permettant de réaliser en sans fin toutes les étapes sauf le nettoyage final. Le temps de réalisation sur cet équipement est inférieur à 4 heures, la partie photopolymérisation restant inférieure à une demi-heure.The invention provides equipment to perform in endless all steps except the final cleaning. The production time on this equipment is less than 4 hours, the light-curing portion remaining less than half an hour.

L'invention propose ainsi un procédé qui ne nécessite pas un usinage final, en garantissant cependant une tolérance dimensionnelle avec gravure de +/- 2/100ème et une surface lisse favorisant l'anti-adhérence vis-à-vis des débris de fibres papier.The invention thus provides a process which does not require final machining, however, in ensuring a dimensional tolerance with +/- 2/100 th of etching a smooth surface and promoting anti-adhesion vis-à-vis the scrap fibers paper.

Il ressort de la description de l'invention, qui précède, que celle-ci permet la réalisation de cylindres de gaufrage dont la couche extérieure à relief destinée à produire l'empreinte dans la substance à déformer est formée par une résine à base d'époxy, d'uréthane ou similaire, ce qui rend les cylindres de gaufrage selon l'invention parfaitement appropriés lorsqu'il s'agit de renouveler fréquemment des collections et réaliser des tirages en série limitée. Le relief de gaufrage peut être réalisé aisément à l'aide de laser UV-visible ou par exemple par la lumière UV-visible non cohérente. L'invention est applicable au gaufrage de papier ou de papier peint, de tissu en ouate de cellulose, de films et cuirs, d'emballages complexes multicouches, au marquage et rainurage de papier et d'emballages, à la dorure et à des procédés assimilés et analogue.It follows from the description of the invention, which precedes, that it allows the realization of embossing rolls whose outer layer embossed to produce the impression in the substance to be deformed is formed by a resin based on epoxy, urethane or similar, which makes the embossing rollers according to the invention perfectly suitable when it comes to frequently renew collections and make limited edition prints. The embossing relief can be easily achieved using UV-visible laser or for example by non-coherent UV-visible light. The invention is applicable to the embossing of paper or wallpaper, cellulose wadding, films and leathers, multi-layered complex packaging, marking and grooving of paper and packaging, gilding and processes. assimilated and the like.

L'invention procure des avantages considérables, tels que la rapidité et la simplicité de la réalisation des cylindres de gaufrage et la réduction d'énergie et de manutention. L'application d'une couche d'enduction d'épaisseur uniforme telle que décrite et représentée sur les figures, sur un cylindre en rotation permet d'obtenir une pièce cylindrique pourvue d'une couche de photopolymère d'une épaisseur entre 0,1 et 3 mm.The invention provides considerable advantages, such as the speed and simplicity of embossing rolls and the reduction of energy and handling. The application of a coating layer of uniform thickness as described and shown in the figures, on a rotating cylinder makes it possible to obtain a cylindrical piece provided with a photopolymer layer having a thickness between 0.1 and 3 mm.

Il est possible d'introduire des renforts de fil ou tissu en verre ou verre et aramide en cours d'imprégnation, par drapage ou bobinage en couches multiples. La couche de photopolymère est réticulable notamment en lumière ultraviolette à des longueurs d'onde comprises entre 350 mm et 405 mm, avec un temps d'insolation entre 10 secondes et 1 minute. Ce mode de réticulation peut être utilisé en rotation ou en rotation et déplacement longitudinal du support de la pièce cylindrique ou en rotation de la pièce cylindrique et déplacement longitudinal du système d'irradiation. Il est possible d'utiliser un masque pour créer une image en relief directement sur la structure composite. Après exposition à la lumière à travers un masque, un nettoyage avec solvant ou en chauffant pour diminuer la viscosité de la matière non réticulée est prévu en chassant cette matière sous jet d'air comprimé ou par aspiration avec une pompe adaptée. Une post-insolation pour atteindre des propriétés mécaniques souhaitées est possible. La couche photopolymère renforcée ou non, et calibrée peut être faite sur un cylindre ou sur un manchon métallique ou sur un manchon composite emmanché sur un cylindre.It is possible to introduce reinforcements of yarn or fabric of glass or glass and aramid during impregnation, by draping or winding in multiple layers. The photopolymer layer is crosslinkable especially in ultraviolet light at wavelengths between 350 mm and 405 mm, with an insolation time between 10 seconds and 1 minute. This crosslinking mode can be used in rotation or in rotation and longitudinal displacement of the support of the cylindrical piece or in rotation of the cylindrical piece and longitudinal displacement of the irradiation system. It is possible to use a mask to create a relief image directly on the composite structure. After exposure to light through a mask, cleaning with solvent or heating to reduce the viscosity of the non-crosslinked material is provided by driving this material under a jet of compressed air or by suction with a suitable pump. Post-insolation to reach desired mechanical properties is possible. The photopolymer layer, reinforced or not, and calibrated can be made on a cylinder or on a metal sleeve or on a composite sleeve fitted on a cylinder.

Claims (20)

  1. An embossing device, such as a cylinder or sleeve, of the type including on its outer peripheral surface a raised and recessed embossing pattern intended to be reproduced on a planar and deformable substance, characterized in that the cylinder or sleeve (2) bears a photopolymer coating (6), the outer surface of which has the raised and recessed embossment pattern (4) made by exposing the coating to light with a mask.
  2. The device according to claim 1, characterized in that the photopolymer coating layer (6) is made on a primary base layer (5), the latter being interposed between the embossment coating and the supporting cylinder (2).
  3. The device according to claim 1 or 2, characterized in that the photopolymer coating (6) is a photocomposition of a determined and adjusted modulus in order not to generate static electric charges and to be anti-adherent towards the substrate to be embossed.
  4. The device according to claim 3, characterized in that the photo composition includes a resin having a Young modulus comprised between 800-2,000 MPa, preferably greater than 1,500 MPa.
  5. The device according to any of claims 1 to 4, characterized in that the embossment coating (6) has a hardness greater than 75 Shore D.
  6. The device according to any of claims 1 to 5, characterized in that the embossment coating has an elastic modulus greater than 800 MPa at room temperatures and greater than 1,500 MPa at a temperature of 80°C.
  7. The device according to any of claims 1 to 6, characterized in that the embossment coating has elastic and mechanical characteristics compatible with loads greater than 100 kg/CML and a velocity of 100 m/min.
  8. The device according to any of claims 1 to 7, characterized in that the photopolymer coating (6) has a thickness from 1 to 3 mm, is cross-linkable in the bulk, the relief having a depth comprised between 0.2-1.2 mm.
  9. The device according to any of claims 1 to 8, characterized in that the embossment coating (6) includes an embossment relief (4) with more than one level advantageously obtained by superposition of several layers.
  10. The device according to any of claims 1 to 9, characterized in that the embossment coating (6) is selected so as to allow deposition of a mask by ink jet or wax, i.e. the creation of an ablated mask, or further direct creation of the relief via a photochemical route in visible or ultraviolet light.
  11. The device according to claim 10, characterized in that the embossment coating (6) is suitable for the use of a light with a wavelength between 395 and 410 nm, with cationic polymerization with or without a sensitizer at the selected wavelength or radical polarization, for a positive relief design.
  12. The device according to any of claims 1 to 11, characterized in that the embossment coating (6) includes a relief, the flanks of which are sloped in order to ensure proper mechanical anchoring.
  13. A method for making an embossing device according to any of claims 1 to 12, characterized in that the material (8) forming the embossment coating (6) is applied on the outer cylindrical face of a supporting cylinder (2) driven into rotation and a member (9, 14, 17) for uniformizing the thickness of the applied material on the peripheral surface of the supporting cylinder (2) is used and further that the raised and recessed embossment pattern is made by exposing the photopolymer coating to light with a mask.
  14. The method according to claim 13, characterized in that an application device (10) displaceable parallel to the axis of the supporting cylinder is used for applying the material (8) of the embossment coating.
  15. The method according to claim 14, characterized in that the member for uniformizing the thickness of the coating is a doctor blade (9) extending along the cylinder (2) parallel to the axis of the latter, at a predetermined distance from the surface of the cylinder, corresponding to the thickness of the applied material layer (6).
  16. The method according to any of claims 13 or 14, characterized in that the member for uniformizing the thickness of the applied embossment coating material layer is a roller (14), the axis of rotation of which is parallel to the axis of rotation of the cylinder and which is translationally displaceable axially along the cylinder, parallel to the axis of the latter, at a distance from the peripheral surface of the cylinder corresponding to the thickness of the embossment coating layer (6).
  17. The method according to any of claims 13 or 14, characterized in that the member for uniformizing the thickness of the embossment coating layer is a cylinder (17), the axis of rotation of which is parallel to the axis of rotation of the supporting cylinder (2) and which is positioned so that a slot (18) is formed between both cylinders, the width of which corresponds to the thickness of the embossment coating layer (6).
  18. The method according to claim 13, characterized in that the embossment coating material is applied to the surface of the supporting cylinder (2) by dipping it in a bath (20) of coating material and in that the thickness of the applied material is uniformized with a cylinder (17), the axis of rotation of which is parallel to the axis of the supporting cylinder (2) and which is positioned so that a slot (18) is formed between both cylinders, the width of which corresponds to the thickness of the coating layer.
  19. The method according to any of claims 17 or 18, characterized in that the width of the slot (18) is variable by variations of the distance Δl of the axes of rotation of both cylinders.
  20. The method according to any of claims 13 to 19, characterized in that a cross-linkable resin based on epoxy, urethane or the like, is used for producing the embossment coating (6).
EP07731241A 2006-04-06 2007-04-02 Embossing device, such as a cylinder or a sleeve Not-in-force EP2007570B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0651239A FR2899502B1 (en) 2006-04-06 2006-04-06 EMBOSSING DEVICE, SUCH AS A CYLINDER OR SLEEVE
PCT/FR2007/000563 WO2007118989A2 (en) 2006-04-06 2007-04-02 Embossing device, such as a cylinder or a sleeve

Publications (2)

Publication Number Publication Date
EP2007570A2 EP2007570A2 (en) 2008-12-31
EP2007570B1 true EP2007570B1 (en) 2010-03-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07731241A Not-in-force EP2007570B1 (en) 2006-04-06 2007-04-02 Embossing device, such as a cylinder or a sleeve

Country Status (7)

Country Link
US (1) US8603583B2 (en)
EP (1) EP2007570B1 (en)
CN (1) CN101460298B (en)
DE (1) DE602007005467D1 (en)
ES (1) ES2342850T3 (en)
FR (1) FR2899502B1 (en)
WO (1) WO2007118989A2 (en)

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Also Published As

Publication number Publication date
FR2899502B1 (en) 2009-04-10
WO2007118989A2 (en) 2007-10-25
US8603583B2 (en) 2013-12-10
WO2007118989A3 (en) 2008-02-28
US20090136679A1 (en) 2009-05-28
EP2007570A2 (en) 2008-12-31
DE602007005467D1 (en) 2010-05-06
CN101460298A (en) 2009-06-17
CN101460298B (en) 2011-09-07
ES2342850T3 (en) 2010-07-15
FR2899502A1 (en) 2007-10-12

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