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

• Embossing device such as a cylinder or sleeve.
• 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.
• 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. . It is also known to use instead of purely mechanical knurling the knurling technology of the mechano-chemical type.
• the object of the invention is to overcome these disadvantages of known embossing devices.
• the embossing device is characterized in that the cylinder carries a photopolymer coating whose outer surface comprises the embossing pattern.
• Figures 1 to 4 illustrate four embodiments of the method of manufacturing an embossing cylinder device according to the invention
• Figure 5 is a perspective view of an embossing cylinder device according to the invention.
• FIG. 5 shows an embossing cylinder device 1 comprising a cylinder 2 which could be made of metal, for example made of steel, or of a composite material, surrounded by a coating 3 whose external surface comprises a relief zone pattern 4 regularly distributed on the periphery. 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.
• the main resin could also be applied directly to the metal by choosing an appropriate resin composition.
• FIGS. 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.
• the method illustrated in Figure 1 provides for 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 displaceable 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 output of the resin 8, the moving 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 10 in the axial direction as indicated by the arrow Fl. It is the squeegee 9 defining between it and the peripheral surface a slot of a predetermined width and uniform over the length of the cylinder which ensures an even thickness the coating that will be subsequently processed to have the embossing pattern.
• FIG. 2 illustrates another embodiment of the method according to the invention, the particularity of which 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 cylinder axis in both directions, as indicated by the arrow F3.
• the resin supply device 10 which is of the same nature as in Figure 1 moves as before, according to the arrow Fl.
• the rectilinear axial movements of the doctor blade 14, rotary cylinder 2 and axial straight of the feeding device 10 have for result that the resin is deposited and uniformized as to the thickness of the resin layer on the peripheral surface of the cylinder along the helical line 15 shown in Figure 2.
• Figure 3 shows a third embodiment of the invention that uses as an 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 layer of embossing 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.
• Figure 4 illustrates yet another embodiment of the method according to the invention, which differs from that shown in Figure 3 by the nature of the application device of 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 in which part of the periphery is engaged with a predetermined depth so that, during the passage of the periphery of the cylinder by the 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 chosen so that it is compatible with a temperature of at least 140 ° C. after complete crosslinking, a double crosslinking system to be possible and postcooking possible 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.
• 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.
• 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 ambient temperature and remaining greater than 500 MPa up to 80 ° C.
• the composition has elastic and mechanical characteristics compatible with loads greater than 100 ° C. Kg / cml and speeds above 100 m / min.
• the resin is resistant to impact and abrasion and can reproduce embossing but also laminating or laminating locally on a multilayer non-fabric, whether or not entangled, by relying on an elastomeric counterpart having a hardness between 50 and 70 Shore A. surface after photopolymerization and cleaning has sufficient anti-adhesion vis-à-vis the 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, aliphatic polyester urethane diacrylate as sold under the name CN981 by the company Cray Valley, 25 parts by weight of a monomer triacrylate: 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 can be cross-linked in thickness from 0.1 to 3 mm in UV light with a peak around 380 nm.
• 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 cross-linked 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 good compromise vis-à-vis the static and 1 anti-adhesion vis-a-vis 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 implemented by casting at a temperature below 80 ° C.
• a regular endless deposit is obtained. of this composition on a known diameter support, which can be fixed or rotated 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 adjusting this beam.
• the invention provides equipment to perform endless all stages 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 that does not require a final machining, however, in ensuring a dimensional tolerance with etching +/- 2 / l00 th and smooth surface promoting the 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 appropriate 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. 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 mode of crosslinking can be used in rotation or in rotation and longitudinal displacement of the support of the cylindrical part or in rotation of the cylindrical part 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.

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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)

Applications Claiming Priority (2)

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• 2006
  • 2006-04-06 FR FR0651239A patent/FR2899502B1/fr not_active Expired - Lifetime
• 2007
  • 2007-04-02 WO PCT/FR2007/000563 patent/WO2007118989A2/fr not_active Ceased
  • 2007-04-02 DE DE602007005467T patent/DE602007005467D1/de active Active
  • 2007-04-02 US US12/299,028 patent/US8603583B2/en not_active Expired - Fee Related
  • 2007-04-02 ES ES07731241T patent/ES2342850T3/es active Active
  • 2007-04-02 CN CN2007800209424A patent/CN101460298B/zh not_active Expired - Fee Related
  • 2007-04-02 EP EP07731241A patent/EP2007570B1/de not_active Not-in-force

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