EP0683040B1 - Process for the manufacture of a sleeve for a printing machine, and sleeve obtained thereby - Google Patents

Process for the manufacture of a sleeve for a printing machine, and sleeve obtained thereby Download PDF

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Publication number
EP0683040B1
EP0683040B1 EP95450009A EP95450009A EP0683040B1 EP 0683040 B1 EP0683040 B1 EP 0683040B1 EP 95450009 A EP95450009 A EP 95450009A EP 95450009 A EP95450009 A EP 95450009A EP 0683040 B1 EP0683040 B1 EP 0683040B1
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EP
European Patent Office
Prior art keywords
layer
sleeve
resin
cylinder
manufacture
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Expired - Lifetime
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EP95450009A
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German (de)
French (fr)
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EP0683040A1 (en
Inventor
Jean Francille
Philippe Francille
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Francille Jean
Francille Philippe
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • B41C1/182—Sleeves; Endless belts

Definitions

  • the subject of the present invention is a method of manufacture of a printing sleeve, in particular for the flexography, in composite material, as well as the sleeve corresponding.
  • Such methods use hollow support cylinders inside which pressurized air is introduced.
  • each of these hollow cylinders has holes that allow pressurized fluid to escape radially.
  • the sleeve which is perfectly adjusted, is found dilated during assembly by pressurized air which escapes from the cylinder through the holes, forming a layer pressurized air.
  • the sleeve can thus be moved in translation from easy way, on an air cushion.
  • the sleeve must have a certain capacity of radial deformation but conversely, we know that it must be very rigid on the outside in order to receive either a layer of finish capable of being ground, ie a layer of elastomer according to the different applications.
  • the sleeve with this layer of finish or this elastomer layer should have a low deformation capacity and it must present a perfect concentricity.
  • sleeves were made of material composite comprising glass fiber mats embedded in resin matrices, but the results do not give complete satisfaction because the weight and the cost increase very quickly with thickness. Also, it is impossible to carry out very wide ranges of developments because the thickness variations for the same internal diameter, corresponding to a given support cylinder, are of low amplitude.
  • the amount of resin also influences predominant over the weight and price of the sleeve as well achieved, which quickly makes it uncompetitive.
  • the present invention aims to overcome these drawbacks and it proposes a process for manufacturing sleeves which is simple to implement, which makes it possible to carry out sleeves of desired thickness in a very wide range, from suitable mechanical strength and a certain elasticity, sufficient to allow mounting by radial expansion at using a pressurized gas, on a chamber cylinder, drilled radially, which is of reduced weight which facilitates handling, which can be used either directly after rectification, either after coating with a layer of elastomer and subsequent machining, i.e. still in heliography, after the deposition of a metallic coating conductor and its engraving.
  • a layer is wound priming on the release agent of the support cylinder, this priming layer comprising a layer of a woven or nonwoven coated with a layer of resin.
  • the complex thicknesses, the patterns and their density are variables as well as hole diameters.
  • the resins used are vinyl ester or epoxy base.
  • top coat shrink film before temperature polymerization and this film is removed after the polymerization to give a suitable surface finish to the final operation.
  • the subject of the invention is also the sleeve obtained by the process, sleeve which comprises a concentric succession from the center outwards, at least one layer of material with through holes, regularly distributed over its surface, this material being a complex composed of a layer of nonwoven material on which is deposited a layer of a material having a high void rate, of the expanded type and screen-printed with a given pattern, of a resin layer having a shrinkage power determined at the polymerization, of at least one winding of a fabric sealing intermediate on the coated resin layer on the complex, and a layer of resin finish.
  • the finishing resins have a code color depending on diameters and / or applications, flexography or heliography.
  • inserts fixed by machining are provided especially to receive sizes.
  • the sleeve According to another practical characteristic of the sleeve, it is provided at least one identification label embedded in mass during manufacture.
  • Figure 1 there is shown a sleeve 10, mounted on a manufacturing support cylinder 12.
  • the different dimensions are greatly exaggerated to show the different layers and to be able to distinguish them one others.
  • the support cylinder 12 comprises, in known manner a internal chamber 14 and radial holes 16, from the chamber 14 and opening onto the outer periphery of said cylinder.
  • either one of the support cylinders supplied is used by the user so that it can be used as a chuck manufacturing the sleeve, which is a guarantee of precision certain, either a machined template sleeve and ground to exact dimensions of the support cylinder on which the sleeves must be fitted.
  • the support cylinder is fixed on a mandrel holder in adapted jaws then it is prepared, in a known manner, by coating it over its entire outer surface with a demoulding.
  • this cylinder On this cylinder, first of all, we wind under tension, for example by wrapping, at least a first layer 18, a woven or nonwoven veil 20 which is coated with a resin 22, the characteristics and properties of which will be described further in the text, so that the veil is impregnated and is pressed onto the release agent, thus marrying the outer periphery of the support cylinder 12 perfectly.
  • a first layer 24 of a complex 26 comprising a layer of nonwoven material 28 on which a layer of expanded material 30.
  • This expanded material 30, as well as shown in Figure 3 is screen printed with a pattern given, in this case a hexagonal pattern, with a physical separation between two adjacent patterns. That is to say that in the preferred embodiment of the invention, the expanded material has a structure in honeycomb, with insulated cells 32, section full hexagonal, and a network of 35 channels separating said cells. The height of each of these cells is identical so that the complex has a given thickness which be sufficiently precise.
  • This first layer 24 of complex 26 is produced by winding a strip of complex, so helical, edge to edge, over the entire length of the cylinder support, by placing the nonwoven 28 inside.
  • the complex thus rolled up is retained by the layer of resin 22 of the priming layer 18 since the nonwoven of the complex is wetted by this resin.
  • This first layer 24 of complex 26 is coated a resin layer 22, in suitable quantity, which is housed in the channels 35, because the expanded material does not absorb the resin and there is amalgamation of the resin from these two layers of resin, on both sides of the material expanded by the channels as shown in Figure 2.
  • holes 34 allow make connections between the inner faces and exterior of the complex, resin bridges, forming as much spacers as will be described later.
  • the winding is carried out with a certain tension of so as to properly plate the complex 26 and to avoid the presence air bubbles during manufacture.
  • a second layer 38 is then wound, of a complex 40, which either is identical to complex 26, either different with cells of dimensions, height and different pattern.
  • a complex has been shown identical.
  • the nonwoven is also placed on the concave face.
  • This second layer 38 of complex 40 is in turn coated with a layer of resin 22 and possibly with a layer 42 of sealing material 37 to homogenize and spread the resin.
  • a layer 44 of a finishing resin 46 is suitable, after polymerization, to be rectified by mechanical machining.
  • This resin may include fillers mineral and / or organic.
  • This fine mesh veil withstands the temperature of cooking and it is removed after the sleeve has been brought to the crosslinking temperature of the resin.
  • the finishing layer receives a pull-out fabric, also retractable, so to maintain the layers concentrically and coaxially, this fabric must also withstand the temperature of crosslinking of resins.
  • This coarse mesh tear-off fabric leaves remain, after removal, a relief on the layer of finish, which allows better adhesion of the layer elastomer which must be deposited there and vulcanized.
  • the formulation of the resin is adapted to shrink and impart to the sleeve thus fabricated a radial shrinkage capability which has a high interest. Mention may be made, as family of polymers used for the development of resins, vinyl esters or epoxy.
  • the sleeve is made on a cylinder with exact dimensions of the support cylinder on which it will be later mounted.
  • Disassembly of the manufacturing cylinder sleeve and its mounting on the working cylinder are only rendered possible only by radial expansion under the effect of air under pressure which escapes from the holes 16 of these cylinders.
  • This arrangement of layers with at least one layer waterproof is essential to obtain the desired effects.
  • a large number of thicknesses can be obtained with a same inside sleeve diameter corresponding to the diameter of the working cylinder by varying the number of layers, which leads to thicknesses between a few millimeters and several centimeters.
  • the process involves decrease the amount of resin by a filling material very light while maintaining connections between the layers resin.
  • FIG. 4A a sleeve-bearing cylinder is shown 60, used in flexographic printing.
  • a sleeve 62 is mounted on this sleeve-carrying cylinder 60.
  • This sleeve is produced according to the method of the invention and the layer of finish has been rectified to present a surface finish smooth and so that the developed diameter corresponds exactly the desired print length. On this surface, it is mechanically produced generators 64 of placement and positioning of the photos.
  • the picture is present in the form of an engraved plate 66, produced in a photopolymer material or rubber, which allows the arrange in a winding around the sleeve.
  • the fixing of this plate is made by interposing a ribbon double-sided adhesive 68.
  • FIGS. 4B and 4C the identical elements have the same references.
  • FIG. 5A a sleeve-bearing cylinder is shown 70 provided to receive a sleeve 72 according to the invention.
  • the outer surface has received a layer 74 of rubber material finish fixed with a adherent.
  • This coating is vulcanized and rectified then it is usually etched using a laser. This kind of engraving allows continuous printing, for example for wallpaper.
  • FIGS. 5B and 5C the elements identical have the same references.
  • the mandrel cylinder 80 supports a specific sleeve 82 produced according to the invention but with a deposition treatment subsequent metal.
  • the top coat 84 of the sleeve 82 is made conductive by incorporating conductive particles or by depositing a layer of carbon, then a metallic deposit of a given thickness is deposited by electrolysis on a thickness sufficient to allow mechanical recovery and machining.
  • the metal deposit is engraved in hollow to reproduce an engraving of variable depth depending on the intensity of the color to be obtained.
  • the deposit metallic is generally made of copper and chrome after engraving.
  • FIGS. 6B and 6C the identical elements have the same references.
  • Such heliographic sleeves find an interest very particular in combined flexography-heliography printing for printing certain areas or barcodes.
  • This belt is arranged at a distance from the inner periphery of the sleeve which is a function of different characteristics of the sleeve, internal diameter, outside diameter, application in particular.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Impact Printers (AREA)

Abstract

Prodn. of an expandable print roller sleeve consists of preparing a rotary support cylinder with release agent; winding on a layer (24) of material (26) having regularly distributed holes (34) over its surface. The material is a complex composed of a layer (28) of non woven material over which is placed a layer of expanded natural (30) having a high space ratio and scream printed with a given pattern (32); This layer is coated with a resin (22), e.g. of vinyl ester or epoxy base, having the ability to retract a given amount on curing. After gelification of the resin an air tight material (37) e.g. of polyester is wound (36) over it. The system is cured at temp. coated (44) with a finishing resin (46), cured and the sleeve removed by dilation under gas press. Finally a layer of elastomer is joined to the sleeve. <IMAGE>

Description

La présente invention a pour objet un procédé de fabrication d'un manchon d'impression, notamment pour la flexographie, en matériau composite, ainsi que le manchon correspondant.The subject of the present invention is a method of manufacture of a printing sleeve, in particular for the flexography, in composite material, as well as the sleeve corresponding.

On connaít de nombreux procédés de montage de manchons d'impression flexographique sur des cylindres support et notamment la demande de brevet européen EP-A-0 196 443.We know many methods of mounting sleeves flexographic printing on support cylinders and in particular European patent application EP-A-0 196 443.

De tels procédés utilisent des cylindres support creux à l'intérieur desquels est introduit de l'air sous pression.Such methods use hollow support cylinders inside which pressurized air is introduced.

La paroi extérieure de chacun de ces cylindres creux est munie de trous qui permettent au fluide sous pression de s'échapper radialement.The outer wall of each of these hollow cylinders has holes that allow pressurized fluid to escape radially.

Ainsi, le manchon, qui est parfaitement ajusté, se trouve dilaté au moment du montage par l'air sous pression qui s'échappe du cylindre par les trous, formant une couche d'air sous pression.Thus, the sleeve, which is perfectly adjusted, is found dilated during assembly by pressurized air which escapes from the cylinder through the holes, forming a layer pressurized air.

Cette dilatation est de très faible amplitude mais néanmoins suffisante.This expansion is of very small amplitude but nevertheless sufficient.

Le manchon peut ainsi être déplacé en translation de façon aisée, sur un coussin d'air.The sleeve can thus be moved in translation from easy way, on an air cushion.

Le manchon doit avoir une certaine capacité de déformation radiale mais à l'inverse, on sait qu'il doit être très rigide à l'extérieur afin de recevoir soit une couche de finition apte à être rectifiée soit une couche d'élastomère en fonction des différentes applications.The sleeve must have a certain capacity of radial deformation but conversely, we know that it must be very rigid on the outside in order to receive either a layer of finish capable of being ground, ie a layer of elastomer according to the different applications.

Dans tous les cas, le manchon avec cette couche de finition ou cette couche en élastomère doit avoir une faible capacité de déformation et il doit présenter une parfaite concentricité.In all cases, the sleeve with this layer of finish or this elastomer layer should have a low deformation capacity and it must present a perfect concentricity.

Ces deux contraintes de capacité d'expansion radiale et de rigidité sont antinomiques et les solutions actuelles sont des compromis peu satisfaisants.These two constraints of radial expansion capacity and of stiffness are contradictory and the current solutions are unsatisfactory compromises.

On sait également que les utilisateurs de manchons d'impression disposent de cylindres support et de jeux de manchons de différentes épaisseurs pour un même diamètre de cylindre support de façon à obtenir, pour un cylindre support donné, différents diamètres extérieurs afin que les développements linéaires obtenus couvrent une gamme aussi étendue que possible.We also know that users of sleeves support cylinders and sets of sleeves of different thicknesses for the same diameter of support cylinder so as to obtain, for a support cylinder given, different outside diameters so that the linear developments obtained cover a range also extent as possible.

On comprend dès lors que plus les manchons peuvent varier en épaisseur d'une faible épaisseur à des épaisseurs importantes et moins il faut de cylindres support puisque pour un même cylindre support on peut couvrir avec les manchons une gamme de développement plus importante.We therefore understand that the more the sleeves can vary in thickness from a small thickness to thicknesses important and less support cylinders are needed since for the same support cylinder we can cover with let's handle a wider development range.

Bien entendu, il faut des manchons supplémentaires mais on sait que :

  • les manchons sont moins chers que les cylindres support,
  • il ne faut pas nécessairement démonter le cylindre support pour mettre le manchon et dans ce cas le gain de temps est intéressant,
  • en cas de démontage, les manchons peuvent être préparés à l'avance sur d'autres cylindres support, et
  • dans tous les cas, il y a un gain de poids qui facilite de façon très importante la manutention, car les utilisateurs sont obligés de stocker, manutentionner et gérer des dizaines et même des centaines de manchons.
Of course, additional sleeves are needed, but we know that:
  • the sleeves are less expensive than the support cylinders,
  • it is not necessary to dismantle the support cylinder to put the sleeve and in this case the time saving is interesting,
  • in the event of disassembly, the sleeves can be prepared in advance on other support cylinders, and
  • in all cases, there is a weight gain which greatly facilitates handling, because users are forced to store, handle and manage dozens and even hundreds of sleeves.

Malheureusement, les manchons connus de l'art antérieur (voir par exemple US-A-5 260 166) ne permettent pas d'atteindre des performances susceptibles de générer les avantages énumérés ci-avant.Unfortunately, the sleeves known from the prior art (see for example US-A-5 260 166) do not achieve performance likely to generate the benefits listed above.

On a cherché jusqu'à présent à réaliser des manchons qui sont plus légers, moins chers et dont les caractéristiques mécaniques sont améliorées. So far we have sought to make sleeves which are lighter, less expensive and whose mechanical characteristics are improved.

Ainsi, des manchons ont été réalisés en matériau composite comprenant des mats de fibres de verre noyés dans des matrices en résine, mais les résultats ne donnent pas entière satisfaction car le poids et le coût augmentent très rapidement avec l'épaisseur. Aussi, il est impossible de réaliser des gammes très larges de développements car les variations d'épaisseur pour un même diamètre intérieur, correspondant à un cylindre support donné, sont de faible amplitude.Thus, sleeves were made of material composite comprising glass fiber mats embedded in resin matrices, but the results do not give complete satisfaction because the weight and the cost increase very quickly with thickness. Also, it is impossible to carry out very wide ranges of developments because the thickness variations for the same internal diameter, corresponding to a given support cylinder, are of low amplitude.

De plus, dans les grandes épaisseurs, la quantité de résine est également très importante, ce qui donne à de tels manchons une rigidité incompatible avec le montage sous pression par dilatation radiale, surtout si l'on souhaite rester dans des gammes de pressions industrielles courantes de l'ordre de quelques bars.In addition, in large thicknesses, the amount of resin is also very important, which gives such sleeves a rigidity incompatible with mounting under pressure by radial expansion, especially if one wishes stay within current industrial pressure ranges on the order of a few bars.

La quantité de résine influe aussi de façon prépondérante sur le poids et le prix du manchon ainsi réalisé, ce qui le rend rapidement non compétitif.The amount of resin also influences predominant over the weight and price of the sleeve as well achieved, which quickly makes it uncompetitive.

La présente invention vise à pallier ces inconvénients et elle propose un procédé de fabrication de manchons qui est simple à mettre en oeuvre, qui permet de réaliser des manchons d'épaisseur voulue dans une gamme très étendue, de résistance mécanique adaptée et d'une certaine élasticité, suffisante pour autoriser un montage par expansion radiale à l'aide d'un gaz sous pression, sur un cylindre à chambre, percé radialement, qui est d'un poids réduit ce qui facilite sa manutention, et qui peut être utilisé soit directement après rectification, soit après revêtement avec une couche d'élastomère et un usinage consécutif, soit encore en héliographie, après le dépôt d'un revêtement métallique conducteur et son gravage.The present invention aims to overcome these drawbacks and it proposes a process for manufacturing sleeves which is simple to implement, which makes it possible to carry out sleeves of desired thickness in a very wide range, from suitable mechanical strength and a certain elasticity, sufficient to allow mounting by radial expansion at using a pressurized gas, on a chamber cylinder, drilled radially, which is of reduced weight which facilitates handling, which can be used either directly after rectification, either after coating with a layer of elastomer and subsequent machining, i.e. still in heliography, after the deposition of a metallic coating conductor and its engraving.

A cet effet, le procédé de fabrication d'un manchon d'impression, expansible, selon l'invention, notamment pour la flexographie, prévu pour être monté sur un cylindre support indéformable muni d'une chambre interne équipée de trous radiaux débouchants à la surface extérieure du cylindre, ce cylindre ayant un diamètre égal à celui du diamètre du cylindre sur lequel sera monté le manchon ainsi fabriqué, se caractérise en ce qu'il comporte les étapes suivantes :

  • mise en rotation et préparation de la surface extérieure du cylindre avec un agent démoulant,
  • enroulement sur ce cylindre support d'une couche d'un matériau comportant des trous traversants, régulièrement répartis sur sa surface, ce matériau étant un complexe composé d'une couche de matériau non tissé sur laquelle est déposée une couche d'un matériau ayant un fort taux de vide, du type expansé et sérigraphié avec un motif donné,
  • enduction de cette couche avec une résine ayant un pouvoir de retrait déterminé à la polymérisation,
  • attente de la gélification,
  • enroulement d'une couche d'un matériau d'étanchéité sur la couche enduite de résine,
  • polymérisation en température,
  • enduction d'une couche de résine de finition,
  • attente de la gélification,
  • polymérisation en température,
  • extraction du manchon fabriqué par dilatation radiale de ce manchon à l'aide de gaz sous pression introduit dans la chambre du cylindre, et
  • reprise du manchon pour un traitement final par rectification mécanique ou par adhérisation d'une couche d'élastomère.
To this end, the method of manufacturing an expandable printing sleeve according to the invention, in particular for flexography, intended to be mounted on a non-deformable support cylinder provided with an internal chamber equipped with radial holes opening out at the outer surface of the cylinder, this cylinder having a diameter equal to that of the diameter of the cylinder on which the sleeve thus manufactured will be mounted, is characterized in that it comprises the following steps:
  • rotation and preparation of the external surface of the cylinder with a release agent,
  • winding on this support cylinder of a layer of a material comprising through holes, regularly distributed over its surface, this material being a complex composed of a layer of nonwoven material on which is deposited a layer of a material having a high vacuum rate, of the expanded type and screen printed with a given pattern,
  • coating of this layer with a resin having a withdrawal power determined during polymerization,
  • waiting for gelation,
  • winding a layer of sealing material on the resin-coated layer,
  • temperature polymerization,
  • coating of a finishing resin layer,
  • waiting for gelation,
  • temperature polymerization,
  • extraction of the sleeve produced by radial expansion of this sleeve using pressurized gas introduced into the chamber of the cylinder, and
  • resumption of the sleeve for a final treatment by mechanical rectification or by adhesion of a layer of elastomer.

Selon une autre caractéristique, on enroule une couche d'amorçage sur l'agent de démoulage du cylindre support, cette couche d'amorçage comprenant une couche d'un tissé ou non tissé enduit d'une couche de résine.According to another characteristic, a layer is wound priming on the release agent of the support cylinder, this priming layer comprising a layer of a woven or nonwoven coated with a layer of resin.

Dans le cas de manchons épais, on répète plusieurs fois l'enroulement de couches de complexe avec enduction de résine jusqu'à obtenir l'épaisseur de manchon recherchée.In the case of thick sleeves, it is repeated several times winding of layers of complex with resin coating until the desired sleeve thickness is obtained.

Selon une autre particularité de l'invention, les épaisseurs de complexe, les motifs et leur densité sont variables ainsi que les diamètres des trous.According to another feature of the invention, the complex thicknesses, the patterns and their density are variables as well as hole diameters.

De façon préférentielle, les résines utilisées sont à base de vinyl-ester ou d'époxy. Preferably, the resins used are vinyl ester or epoxy base.

Dans un mode de réalisation particulier, on dispose sur la couche de finition un film rétractable avant la polymérisation en température et on retire ce film après la polymérisation de façon à conférer un état de surface adapté à l'opération finale.In a particular embodiment, we have on top coat shrink film before temperature polymerization and this film is removed after the polymerization to give a suitable surface finish to the final operation.

L'invention a également pour objet le manchon obtenu par le procédé, manchon qui comprend une succession concentrique du centre vers l'extérieur, d'au moins une couche d'un matériau comportant des trous traversants, régulièrement répartis sur sa surface, ce matériau étant un complexe composé d'une couche de matériau non tissé sur laquelle est déposée une couche d'un matériau ayant un fort taux de vide, du type expansé et sérigraphié avec un motif donné, d'une couche de résine ayant un pouvoir de retrait déterminé à la polymérisation, d'au moins un enroulement d'un tissu intermédiaire d'étanchéité sur la couche de résine enduite sur le complexe, et d'une couche de résine de finition.The subject of the invention is also the sleeve obtained by the process, sleeve which comprises a concentric succession from the center outwards, at least one layer of material with through holes, regularly distributed over its surface, this material being a complex composed of a layer of nonwoven material on which is deposited a layer of a material having a high void rate, of the expanded type and screen-printed with a given pattern, of a resin layer having a shrinkage power determined at the polymerization, of at least one winding of a fabric sealing intermediate on the coated resin layer on the complex, and a layer of resin finish.

De façon utile, les résines de finition ont un code couleur en fonction des diamètres et/ou des applications, flexographie ou héliographie.Usefully, the finishing resins have a code color depending on diameters and / or applications, flexography or heliography.

Dans le cas d'une application à la flexographie avec cliché rapporté, il est prévu des inserts fixés par usinage notamment pour recevoir des pointures.In the case of an application to flexography with insert, inserts fixed by machining are provided especially to receive sizes.

Selon une autre caractéristique pratique du manchon, il est prévu au moins une étiquette d'identification noyée dans la masse lors de la fabrication.According to another practical characteristic of the sleeve, it is provided at least one identification label embedded in mass during manufacture.

L'invention est décrite ci-après selon un mode de réalisation préférentiel, en regard des dessins annexés qui représentent :

  • Figure 1, une vue d'un manchon selon l'invention, en perspective avec un arrachement partiel faisant apparaítre les différentes couches,
  • Figure 2, une vue de détail en coupe transversale du manchon,
  • Figure 3, une vue en perspective schématique agrandie d'un ensemble de cellules d'une couche obtenue lors de la fabrication d'un manchon par le procédé selon l'invention,
  • Figurez 4A, 4B, 4C respectivement, une vue en perspective, une demi-vue en coupe longitudinale et une vue en coupe transversale d'une réalisation flexographique avec un cliché,
  • Figures 5A, 5B, 5C respectivement, une vue en perspective, une demi-vue en coupe longitudinale et une vue en coupe transversale d'une réalisation avec une couche d'élastomère gravé, et
  • Figure 6A, 6B, 6C respectivement, une vue en perspective, une demi-vue en coupe longitudinale et une vue en coupe transversale d'une réalisation avec un revêtement métallique conducteur pour une application héliographique.
The invention is described below according to a preferred embodiment, with reference to the appended drawings which represent:
  • FIG. 1, a view of a sleeve according to the invention, in perspective with a partial cutaway showing the different layers,
  • FIG. 2, a detailed view in cross section of the sleeve,
  • FIG. 3, an enlarged schematic perspective view of a set of cells with a layer obtained during the manufacture of a sleeve by the method according to the invention,
  • Figure 4A, 4B, 4C respectively, a perspective view, a half-view in longitudinal section and a cross-sectional view of a flexographic embodiment with a plate,
  • FIGS. 5A, 5B, 5C respectively, a perspective view, a half-view in longitudinal section and a cross-sectional view of an embodiment with an etched layer of elastomer, and
  • Figure 6A, 6B, 6C respectively, a perspective view, a half-view in longitudinal section and a cross-sectional view of an embodiment with a conductive metal coating for heliographic application.

Sur la figure 1, on a représenté un manchon 10, monté sur un cylindre support 12 de fabrication. Les différentes dimensions sont fortement exagérées pour faire apparaítre les différentes couches et pour pouvoir les distinguer les unes des autres.In Figure 1, there is shown a sleeve 10, mounted on a manufacturing support cylinder 12. The different dimensions are greatly exaggerated to show the different layers and to be able to distinguish them one others.

Le cylindre support 12 comprend, de façon connue une chambre interne 14 et des trous radiaux 16, issus de la chambre 14 et débouchant à la périphérie extérieure dudit cylindre.The support cylinder 12 comprises, in known manner a internal chamber 14 and radial holes 16, from the chamber 14 and opening onto the outer periphery of said cylinder.

Pour la réalisation d'un manchon suivant le procédé de l'invention, on utilise soit un des cylindres support fourni par l'utilisateur afin qu'il soit utilisé comme mandrin de fabrication du manchon, ce qui est le gage d'une précision certaine, soit un manchon gabarit usiné et rectifié aux dimensions exactes du cylindre support sur lequel les manchons doivent être montés.For the production of a sleeve according to the process of the invention, either one of the support cylinders supplied is used by the user so that it can be used as a chuck manufacturing the sleeve, which is a guarantee of precision certain, either a machined template sleeve and ground to exact dimensions of the support cylinder on which the sleeves must be fitted.

Le cylindre support est fixé sur un porte mandrin dans des mâchoires adaptées puis il est préparé, de façon connue, en le revêtant sur toute sa surface extérieure d'un agent de démoulage.The support cylinder is fixed on a mandrel holder in adapted jaws then it is prepared, in a known manner, by coating it over its entire outer surface with a demoulding.

Sur ce cylindre, tout d'abord, on enroule sous tension, par exemple par banderolage, au moins une première couche 18, d'un voile 20 tissé ou non tissé, qui est enduit d'une résine 22, dont les caractéristiques et propriétés seront décrites plus avant dans le texte, afin que le voile soit imprégné et se plaque sur l'agent de démoulage, épousant ainsi parfaitement la périphérie extérieure du cylindre support 12.On this cylinder, first of all, we wind under tension, for example by wrapping, at least a first layer 18, a woven or nonwoven veil 20 which is coated with a resin 22, the characteristics and properties of which will be described further in the text, so that the veil is impregnated and is pressed onto the release agent, thus marrying the outer periphery of the support cylinder 12 perfectly.

Sur cette couche dite d'amorçage, on enroule une première couche 24 d'un complexe 26 comprenant une couche de matériau non tissé 28 sur laquelle est déposée une couche de matériau expansé 30. Ce matériau expansé 30, ainsi que représenté sur la figure 3, est sérigraphié avec un motif donné, en l'occurrence un motif hexagonal, avec une séparation physique entre deux motifs adjacents. C'est-à-dire que dans le mode de réalisation préférentiel du procédé de l'invention, le matériau expansé présente une structure en nid d'abeilles, avec des cellules isolées 32, à section hexagonale pleine, et un réseau de canaux 35 séparant lesdites cellules. La hauteur de chacune de ces cellules est identique afin que le complexe ait une épaisseur donnée qui soit suffisamment précise.On this so-called priming layer, a first layer 24 of a complex 26 comprising a layer of nonwoven material 28 on which a layer of expanded material 30. This expanded material 30, as well as shown in Figure 3, is screen printed with a pattern given, in this case a hexagonal pattern, with a physical separation between two adjacent patterns. That is to say that in the preferred embodiment of the the invention, the expanded material has a structure in honeycomb, with insulated cells 32, section full hexagonal, and a network of 35 channels separating said cells. The height of each of these cells is identical so that the complex has a given thickness which be sufficiently precise.

Cette première couche 24 de complexe 26 est réalisée par enroulement d'une bande de complexe, de façon hélicoïdale, bord à bord, sur toute la longueur du cylindre support, en disposant le non tissé 28 à l'intérieur.This first layer 24 of complex 26 is produced by winding a strip of complex, so helical, edge to edge, over the entire length of the cylinder support, by placing the nonwoven 28 inside.

En se reportant à la figure 2, on comprend que les cellules 32 du complexe 26, lorsqu'il est enroulé sur le cylindre, bord à bord, laisse subsister le réseau de canaux 35. Ces canaux, par la courbure à laquelle est soumis le complexe, s'ouvrent légèrement sur la face convexe et se ferment légèrement sur la face concave formant ainsi des canaux à section en V tronqué à la base, en forme d'entonnoir. Ceci n'est pas visible sur la figure 2 pour maintenir la clarté du dessin.Referring to Figure 2, we understand that the cells 32 of complex 26, when wound on the cylinder, edge to edge, leaves the network of channels 35. These channels, by the curvature to which the complex, open slightly on the convex face and close slightly on the concave side thus forming V-shaped channels truncated at the base, shaped funnel. This is not visible in Figure 2 for maintain the clarity of the drawing.

On remarque par contre sur cette figure 2 la présence de trous 34, d'un diamètre donné, ménagés à travers le complexe, perpendiculairement à sa surface en sorte que les trous, une fois le complexe enroulé, se trouvent orientés radialement ou proche d'une orientation radiale.On the other hand, we note in this figure 2 the presence holes 34, of a given diameter, formed through the complex, perpendicular to its surface so that the holes, once the complex rolled up, are oriented radially or close to a radial orientation.

Le complexe ainsi enroulé est retenu par la couche de résine 22 de la couche d'amorçage 18 puisque le non tissé du complexe est mouillé par cette résine.The complex thus rolled up is retained by the layer of resin 22 of the priming layer 18 since the nonwoven of the complex is wetted by this resin.

Cette première couche 24 de complexe 26 est enduite d'une couche de résine 22, en quantité adaptée, qui se loge dans les canaux 35, car le matériau expansé n'absorbe pas la résine et il y a amalgame de la résine de ces deux couches de résine, de part et d'autre du matériau expansé par les canaux ainsi que cela est représenté sur la figure 2.This first layer 24 of complex 26 is coated a resin layer 22, in suitable quantity, which is housed in the channels 35, because the expanded material does not absorb the resin and there is amalgamation of the resin from these two layers of resin, on both sides of the material expanded by the channels as shown in Figure 2.

On remarque également que les trous 34 permettent de réaliser des liaisons entre les faces intérieure et extérieure du complexe, des ponts de résine, formant autant d'entretoises ainsi que cela sera décrit ultérieurement.We also note that the holes 34 allow make connections between the inner faces and exterior of the complex, resin bridges, forming as much spacers as will be described later.

L'enroulement est effectué avec une certaine tension de façon à bien plaquer le complexe 26 et à éviter la présence de bulles d'air lors de la fabrication.The winding is carried out with a certain tension of so as to properly plate the complex 26 and to avoid the presence air bubbles during manufacture.

Lorsque la résine 22 du complexe est gélifiée, on enroule alors sur le complexe 26, au moins une couche 36 d'un matériau 37 dit "d'étanchéité", dans le cas présent un non tissé en polyester. Ce matériau permet de mouiller toute la surface extérieure du complexe en répartissant la résine.When the resin 22 of the complex is gelled, we then wraps on the complex 26, at least one layer 36 of a material 37 called "sealing", in this case a no woven in polyester. This material makes it possible to wet the whole exterior surface of the complex by distributing the resin.

On enroule ensuite une deuxième couche 38, d'un complexe 40, qui, soit est identique au complexe 26, soit différent avec des cellules de dimensions, de hauteur et de motif différents. Dans le mode de réalisation représenté et dans un souci de simplification, on a représenté un complexe identique.A second layer 38 is then wound, of a complex 40, which either is identical to complex 26, either different with cells of dimensions, height and different pattern. In the embodiment shown and for the sake of simplification, a complex has been shown identical.

Le non tissé est également disposé sur la face concave.The nonwoven is also placed on the concave face.

Cette deuxième couche 38 de complexe 40 est à son tour enduite d'une couche de résine 22 et éventuellement d'une couche 42 de matériau d'étanchéité 37 pour homogénéiser et répartir la résine.This second layer 38 of complex 40 is in turn coated with a layer of resin 22 and possibly with a layer 42 of sealing material 37 to homogenize and spread the resin.

Dans le mode de réalisation représenté, il est prévu de disposer une couche 44 d'une résine de finition 46. Cette résine est apte, après polymérisation, à être rectifiée par usinage mécanique. Cette résine peut comprendre des charges minérales et/ou organiques.In the embodiment shown, provision is made for have a layer 44 of a finishing resin 46. This resin is suitable, after polymerization, to be rectified by mechanical machining. This resin may include fillers mineral and / or organic.

Dans le cas d'une fabrication de manchons dont la surface est usinée afin de recevoir directement des clichés, on dispose sur la surface de la résine de finition, un voile légèrement rétractable afin de comprimer les différentes couches superposées. In the case of the production of sleeves whose surface is machined in order to receive pictures directly, a veil is placed on the surface of the finishing resin slightly retractable in order to compress the different overlapping layers.

Ce voile à maille fine résiste à la température de cuisson et il est retiré après que le manchon ait été porté à la température de réticulation de la résine.This fine mesh veil withstands the temperature of cooking and it is removed after the sleeve has been brought to the crosslinking temperature of the resin.

Ainsi les couches sont bien concentriques, coaxiales et l'état de surface, avec un grain très fin, permet un usinage et une rectification de qualité.So the layers are well concentric, coaxial and the surface condition, with a very fine grain, allows machining and a quality correction.

Dans le cas d'une fabrication de manchons destinés à supporter une couche d'élastomère, la couche de finition reçoit un tissu d'arrachage, également rétractable, de façon à maintenir les couches concentriquement et coaxialement, ce tissu devant également résister à la température de réticulation des résines.In the case of the manufacture of sleeves intended for support a layer of elastomer, the finishing layer receives a pull-out fabric, also retractable, so to maintain the layers concentrically and coaxially, this fabric must also withstand the temperature of crosslinking of resins.

Ce tissu d'arrachage à mailles grossières laisse subsister, après retrait, un relief sur la couche de finition, qui permet de mieux adhériser la couche d'élastomère qui doit y être déposée et vulcanisée.This coarse mesh tear-off fabric leaves remain, after removal, a relief on the layer of finish, which allows better adhesion of the layer elastomer which must be deposited there and vulcanized.

Selon le procédé de l'invention, la formulation de la résine est adaptée pour se rétracter et conférer au manchon ainsi fabriqué une capacité de retrait radial qui présente un grand intérêt. On peut citer comme famille de polymères servant à l'élaboration des résines, les vinyl-ester ou les époxy.According to the process of the invention, the formulation of the resin is adapted to shrink and impart to the sleeve thus fabricated a radial shrinkage capability which has a high interest. Mention may be made, as family of polymers used for the development of resins, vinyl esters or epoxy.

En effet, ainsi que cela a été indiqué en préambule, le manchon est fabriqué sur un cylindre aux dimensions exactes du cylindre support sur lequel il sera monté ultérieurement.Indeed, as indicated in the preamble, the sleeve is made on a cylinder with exact dimensions of the support cylinder on which it will be later mounted.

De ce fait, le retrait conduit à une diminution du diamètre du manchon qui se trouve plus petit que le diamètre du cylindre.As a result, the withdrawal leads to a decrease in the diameter of the sleeve which is smaller than the diameter of the cylinder.

C'est ce retrait qui permet au manchon de se plaquer ultérieurement contre le cylindre de travail et qui engendre des forces de serrage telles que le manchon ne tourne pas par rapport au cylindre sur lequel il est monté, malgré les couples de rotations engendrés par la vitesse de rotation.It is this withdrawal that allows the sleeve to be pressed later against the working cylinder and which generates clamping forces such that the sleeve does not rotate by compared to the cylinder on which it is mounted, despite the rotational torques generated by the rotational speed.

On remarque que l'effort de serrage, donc le retrait correspondant doit être inversement proportionnel au diamètre du cylindre.We note that the clamping force, therefore the withdrawal corresponding must be inversely proportional to the diameter of the cylinder.

En effet, plus le diamètre diminue, plus la surface de contact entre le manchon et le cylindre de travail diminue, plus il faut augmenter la force de serrage pour obtenir un blocage identique pour tous les manchons, quel que soit le diamètre.Indeed, the more the diameter decreases, the more the surface of contact between the sleeve and the working cylinder decreases, the more you have to increase the clamping force to obtain a identical locking for all sleeves, whatever the diameter.

Le démontage du manchon du cylindre de fabrication et son montage sur le cylindre de travail ne sont rendus possibles que par l'expansion radiale sous l'effet de l'air sous pression qui s'échappe des trous 16 de ces cylindres.Disassembly of the manufacturing cylinder sleeve and its mounting on the working cylinder are only rendered possible only by radial expansion under the effect of air under pressure which escapes from the holes 16 of these cylinders.

Cette expansion radiale, de quelques centièmes de millimètres, donc très faible comparée au diamètre du manchon, est rendue possible par le fait que le matériau expansé n'absorbe pas de résine et que les liaisons des couches par la résine dans les canaux, d'une part, et dans les trous, d'autre part, confèrent à l'ensemble une possibilité de déformation dans le domaine élastique.This radial expansion, of a few hundredths of millimeters, so very small compared to the diameter of the sleeve, is made possible by the fact that the material expanded does not absorb resin and only the bonds of layers by the resin in the channels, on the one hand, and in the holes, on the other hand, give the whole a possibility of deformation in the elastic domain.

Cette plage est très courte mais elle existe.This beach is very short but it exists.

Si l'on poursuit la déformation, on arrive dans une plage plastique qui requiert des forces de déformation beaucoup plus importantes que celles générées par l'air sous pression issu des trous du cylindre, si bien que lors du retrait ou du montage, on reste dans la zone élastique, sans possibilité de dégradation mécanique du manchon.If we continue the deformation, we arrive in a plastic area which requires deformation forces much larger than those generated by the air under pressure from the cylinder holes, so that when removal or mounting, we remain in the elastic zone, without possibility of mechanical degradation of the sleeve.

Cet agencement de couches avec au moins une couche étanche est essentiel pour obtenir les effets recherchés.This arrangement of layers with at least one layer waterproof is essential to obtain the desired effects.

On remarque également que les ponts de résine obtenus par les trous 34 permettent de conférer au manchon une très grande rigidité, notamment à la compression.We also note that the resin bridges obtained through the holes 34 make it possible to give the sleeve a very high rigidity, especially in compression.

On peut obtenir un grand nombre d'épaisseurs avec un même diamètre intérieur de manchon correspondant au diamètre du cylindre de travail en faisant varier le nombre de couches, ce qui conduit à des épaisseurs comprises entre quelques millimètres et plusieurs centimètres.A large number of thicknesses can be obtained with a same inside sleeve diameter corresponding to the diameter of the working cylinder by varying the number of layers, which leads to thicknesses between a few millimeters and several centimeters.

On peut également jouer sur les combinaisons de différents complexes, avec des épaisseurs différentes, des motifs de cellule variés, de plus ou moins grande densité.We can also play on combinations of different complexes, with different thicknesses, various cell patterns, of varying density.

On considère également comme compris dans le procédé selon l'invention le recours à des complexes obtenus de quelque façon que ce soit pour autant qu'ils présentent un matériau expansé ou présentant un certain taux de vide comme des billes par exemple, associé à un voile de tissé ou non tissé. En effet, on peut recourir à un complexe préparé industriellement par sérigraphie en imprimant un motif ou un complexe préparé par enduction d'un non tissé avec une projection de billes, lequel matériau est ensuite percé de multiples trous.We also consider as included in the process according to the invention the use of complexes obtained from any way as long as they present a expanded material or having a certain void content such as marbles for example, associated with a veil of woven or not woven. Indeed, one can resort to a prepared complex industrially by screen printing by printing a pattern or complex prepared by coating a nonwoven with a projection of balls, which material is then pierced with multiple holes.

Ainsi que cela a été expliqué, le procédé consiste à diminuer la quantité de résine par un matériau de remplissage très léger tout en maintenant des liaisons entre les couches de résine.As explained, the process involves decrease the amount of resin by a filling material very light while maintaining connections between the layers resin.

Afin de pouvoir classer les manchons durant leur stockage ou simplement pour pouvoir vérifier d'un coup d'oeil qu'il s'agit du manchon recherché, il est prévu de choisir des résines de couleur pour la couche de finition avec un code prédéterminé en fonction des applications ou des dimensions.In order to be able to classify the sleeves during their storage or simply to be able to check at a glance that it is the desired sleeve, it is planned to choose color resins for the top coat with a predetermined code depending on the applications or dimensions.

De même, on peut introduire à l'intérieur du manchon, sous la première couche de complexe, une étiquette de référence par exemple, qui reste visible après la fabrication, à l'intérieur et qui est donc inviolable par la fabrication même du manchon.Similarly, we can introduce inside the sleeve, under the first layer of complex, a label of reference for example, which remains visible after the manufacturing, inside and which is therefore inviolable by the manufacture of the sleeve itself.

De tels manchons sont appliqués à la flexographie, figure 4A, 4B, 4C et 5A, 5B, 5C, mais il est également possible de fabriquer de la même façon des manchons pour l'héliographie. On trouve des coupes de tels manchons sur les figures 6A, 6B et 6C. Sur ces figures, on a représenté simplement la couche de finition et les éléments complémentaires en fonction de l'application, les autres couches intérieures étant identiques et réalisées selon le procédé précédemment décrit.Such sleeves are applied to flexography, figure 4A, 4B, 4C and 5A, 5B, 5C, but it is also possible to manufacture sleeves in the same way for heliography. There are sections of such sleeves on the Figures 6A, 6B and 6C. In these figures, there is shown just the top coat and the elements depending on the application, the others inner layers being identical and produced according to the previously described process.

Sur la figure 4A, on a représenté un cylindre porte-manchon 60, utilisé en flexographie-cliché. Un manchon 62 est monté sur ce cylindre porte-manchon 60. Ce manchon est réalisé selon le procédé de l'invention et la couche de finition a été rectifiée pour présenter un état de surface lisse et pour que le diamètre développé corresponde exactement à la longueur d'impression recherchée. Sur cette surface, il est mécaniquement réalisé des génératrices 64 de mise en place et de positionnement des clichés. Le cliché se présente sous forme d'une plaque gravée 66, réalisée en un matériau photopolymère ou caoutchouc, ce qui permet de la disposer en enroulement autour du manchon. La fixation de cette plaque est réalisée par interposition d'un ruban adhésif double face 68. Sur les figures 4B et 4C, les éléments identiques portent les mêmes références.In FIG. 4A, a sleeve-bearing cylinder is shown 60, used in flexographic printing. A sleeve 62 is mounted on this sleeve-carrying cylinder 60. This sleeve is produced according to the method of the invention and the layer of finish has been rectified to present a surface finish smooth and so that the developed diameter corresponds exactly the desired print length. On this surface, it is mechanically produced generators 64 of placement and positioning of the photos. The picture is present in the form of an engraved plate 66, produced in a photopolymer material or rubber, which allows the arrange in a winding around the sleeve. The fixing of this plate is made by interposing a ribbon double-sided adhesive 68. In FIGS. 4B and 4C, the identical elements have the same references.

Sur la figure 5A, on a représenté un cylindre porte-manchon 70 prévu pour recevoir un manchon 72 selon l'invention. La surface extérieure a reçu une couche 74 de finition en matériau caoutchouc fixée à l'aide d'un adhérisant. Ce revêtement est vulcanisé et rectifié puis il est gravé à l'aide d'un laser, généralement. Ce type de gravure permet une impression en continu, par exemple pour papier peint. Sur les figures 5B et 5C, les éléments identiques portent les mêmes références.In FIG. 5A, a sleeve-bearing cylinder is shown 70 provided to receive a sleeve 72 according to the invention. The outer surface has received a layer 74 of rubber material finish fixed with a adherent. This coating is vulcanized and rectified then it is usually etched using a laser. This kind of engraving allows continuous printing, for example for wallpaper. In FIGS. 5B and 5C, the elements identical have the same references.

Sur la figure 6A, pour l'application à l'héliographie, le cylindre porte-mandrin 80 supporte un manchon spécifique 82 réalisé selon l'invention mais avec un traitement de dépôt métallique ultérieur. Dans ce but, la couche de finition 84 du manchon 82 est rendue conductrice par incorporation de particules conductrices ou par dépôt d'une couche de carbone, puis un dépôt métallique d'une épaisseur donnée est déposée par électrolyse sur une épaisseur suffisante pour permettre une reprise et un usinage mécanique. Une fois mise au développement recherché, le dépôt métallique est gravé en creux afin de reproduire une gravure de profondeur variable en fonction de l'intensité de la couleur à obtenir. Le dépôt métallique est généralement réalisé en cuivre et chromé après gravure. Sur les figures 6B et 6C, les éléments identiques portent les mêmes références.In FIG. 6A, for the application to heliography, the mandrel cylinder 80 supports a specific sleeve 82 produced according to the invention but with a deposition treatment subsequent metal. For this purpose, the top coat 84 of the sleeve 82 is made conductive by incorporating conductive particles or by depositing a layer of carbon, then a metallic deposit of a given thickness is deposited by electrolysis on a thickness sufficient to allow mechanical recovery and machining. Once set development sought, the metal deposit is engraved in hollow to reproduce an engraving of variable depth depending on the intensity of the color to be obtained. The deposit metallic is generally made of copper and chrome after engraving. In FIGS. 6B and 6C, the identical elements have the same references.

De tels manchons héliographiques trouvent un intérêt tout particulier dans l'impression combinée flexographie-héliographie pour l'impression de certains aplats ou de codes-barres.Such heliographic sleeves find an interest very particular in combined flexography-heliography printing for printing certain areas or barcodes.

Le procédé ainsi décrit permet la réalisation de manchons spécifiques qui font aussi partie de la présente invention.The process thus described allows the realization of specific sleeves which are also part of this invention.

On peut aussi prévoir de fixer des inserts rapportés par usinage dans les dernières couches de façon à pouvoir y monter ultérieurement des pointures pour la fixation des clichés. It is also possible to provide attached inserts by machining in the last layers in order to be able to later fit sizes for fixing the clichés.

Dans le cas où les épaisseurs atteintes sont très importantes, il est possible de réaliser une ceinture intermédiaire, avec une forte épaisseur de résine de l'ordre de 1 à 3 millimètres pour fixer un ordre de grandeur, en sorte que cette ceinture bloque les capacités d'expansion radiale. Cette ceinture est ménagée à une distance de la périphérie intérieure du manchon qui est fonction des différentes caractéristiques du manchon, diamètre intérieur, diamètre extérieur, application notamment.If the thicknesses reached are very important, it is possible to make a belt intermediate, with a high thickness of resin of the order from 1 to 3 millimeters to fix an order of magnitude, in so that this belt blocks expansion capabilities radial. This belt is arranged at a distance from the inner periphery of the sleeve which is a function of different characteristics of the sleeve, internal diameter, outside diameter, application in particular.

Claims (10)

  1. Process for the manufacture of an expandable printing sleeve, for use in flexographic printing, designed to be mounted on a rigid support cylinder (12) equipped with an internal chamber (14) in which are formed radial holes (16) opening to the external surface of the cylinder, said cylinder having a diameter equal to that of the diameter of the cylinder on which the sleeve manufactured in accordance with this process will be mounted, said process comprising the following steps:
    rotation and preparation of the external surface of the cylinder using a releasing agent,
    winding a layer (24) of material (26) onto this support cylinder, said material being equipped with through holes (34) regularly distributed on its surface and being formed from a mixture composed of a layer of non-woven material (28) on which is placed a layer of material (30) having a high cavity proportion, on which a given motif (32), has been printed using a serigraphy process,
    coating of this layer with a resin (22) having a determined degree of contraction on polymerization,
    waiting for this to gel,
    winding a layer (36) of a watertight material (37) onto the layer coated with resin (22),
    polymerizing by heat,
    coating with a finishing layer (44) of resin (46),
    waiting for this to gel,
    polymerizing by heat,
    removal of the sleeve thus obtained by radial dilation of said sleeve using pressurized gas introduced into the chamber of the cylinder, and
    recovery of the sleeve for final treatment by machining or adhesion of a layer of elastomer.
  2. Process for the manufacture of an expandable printing sleeve as claimed in claim 1, characterized in that a priming layer (18) is wound onto the releasing agent of the support cylinder, this priming layer comprising a woven or non-woven layer (20) of material coated with a layer of resin (22).
  3. Process for the manufacture of an expandable printing sleeve as claimed in claim 1 or 2, characterized in that the resin-coated layers of compound materials are wound around several times until the required thickness of sleeve is obtained.
  4. Process for the manufacture of an expandable printing sleeve as claimed in any one of the preceding claims, characterized in that the thickness of the compound materials, the motifs of the cells (32) and their density are variable, as are the diameters of the holes (34).
  5. Process for the manufacture of an expandable printing sleeve as claimed in any one of the preceding claims, characterized in that the resins (22) used are vinyl-ester or epoxy based.
  6. Process for the manufacture of an expandable printing sleeve as claimed in any one of the preceding claims, characterized in that a shrinkage film is placed on the finishing layer before heat polymerization and that this film is removed after polymerization in order to obtain a surface which is suitable for the final operation.
  7. Sleeve for cylinder used in a printing machine obtained in accordance with the process as claimed in any one of the preceding claims, said sleeve comprising a concentric succession from the centre towards the exterior of at least one layer (24, 38) of a material having through holes (34) regularly distributed on its surface, this material being a compound mixture of a layer of unwoven material (28) on which is placed a layer of a material (30) having a high cavity proportion, on which a given motif (32) has been printed using a silk screen process, a coat of resin (22) having a determined degree of contraction on polymerization, at least one layer (36) of a watertight material (37) on the layer of resin coating the compound material and one finishing layer (44) of resin.
  8. Sleeve for cylinder used in a printing machine as claimed in claim 7, characterized in that it comprises finishing resins which have a colour code depending upon the diameters and/or applications, whether flexographic printing or photogravure.
  9. Sleeve for cylinder used in a printing machine as claimed in claim 7 or 8, characterized in that comprises inserts formed by machining, in particular in order to receive points.
  10. Sleeve for cylinder used in a printing machine as claimed in claim 7, 8 or 9, characterized in that comprises at least one label embedded in the compound during manufacture.
EP95450009A 1994-05-19 1995-05-18 Process for the manufacture of a sleeve for a printing machine, and sleeve obtained thereby Expired - Lifetime EP0683040B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9406417 1994-05-19
FR9406417 1994-05-19

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EP0683040B1 true EP0683040B1 (en) 1998-09-30

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US5840386A (en) * 1996-02-22 1998-11-24 Praxair S.T. Technology, Inc. Sleeve for a liquid transfer roll and method for producing it
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DE69505044T2 (en) 1999-05-27
ATE171673T1 (en) 1998-10-15
DE69505044D1 (en) 1998-11-05
EP0683040A1 (en) 1995-11-22
CA2149716A1 (en) 1995-11-20
DK0683040T3 (en) 1999-06-21
ES2124987T3 (en) 1999-02-16

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