EP0824078B1 - Lithographic layer for a printing blanket and blanket provided with such a layer - Google Patents
Lithographic layer for a printing blanket and blanket provided with such a layer Download PDFInfo
- Publication number
- EP0824078B1 EP0824078B1 EP97401874A EP97401874A EP0824078B1 EP 0824078 B1 EP0824078 B1 EP 0824078B1 EP 97401874 A EP97401874 A EP 97401874A EP 97401874 A EP97401874 A EP 97401874A EP 0824078 B1 EP0824078 B1 EP 0824078B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- parts
- weight
- blanket
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
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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
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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
- B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
- B41N10/02—Blanket structure
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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
- B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
- B41N2210/02—Top layers
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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
- B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
- B41N2210/10—Location or type of the layers in multi-layer blankets or like coverings characterised by inorganic compounds, e.g. pigments
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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
- B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
- B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31591—Next to cellulosic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31884—Regenerated or modified cellulose
- Y10T428/31888—Addition polymer of hydrocarbon[s] only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31899—Addition polymer of hydrocarbon[s] only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31899—Addition polymer of hydrocarbon[s] only
- Y10T428/31902—Monoethylenically unsaturated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31906—Ester, halide or nitrile of addition polymer
Definitions
- the main subject of the present invention is a lithographic layer for a printing blanket of any structure.
- offset printing machines use a cylinder coated with offset plate receiving water and ink to form a latent image which is transferred to a blanket comprising a lithographic outer layer capable of transfer the image to a paper medium for example.
- Document FR-2 152 195 describes a printing blanket comprising a lithographic layer. Hydroxyl products are integrated into the composition of this layer and they provide an antistatic character. Thus, this document does not plan to improve the transfer of ink.
- Water and ink transfers from the offset plate on the lithographic layer, then on the layer lithographic on paper are governed by a certain number of affinity parameters for water and ink the offset plate, from the lithographic layer of the blanket, and paper.
- surface energy of a dispersive nature is defined by its dispersive component.
- lithographic layers known for printing blankets are made of rubber nitrile.
- Such a layer constitutes a non-polar surface or very weakly polar, so that it is weakly polar wetted by polar water, so the ink has tendency to accumulate on said surface. So the blanket surface gets dirty easily. In addition the ink on paper is far from being transferred ideally so that printing on paper can be unsatisfactory.
- the dispersive component of the layer lithographic is high, a large amount of ink will be retained on the blanket, but its release on the paper will be difficult, and said blanket will become dirty.
- Document JP-63-5997 describes a blanket which presents good ink transfer qualities.
- This blanket includes a lithographic layer of a polymer fulfilling specific conditions in terms of swelling with ink solvent and hardness.
- This polymer can, for example, be polyurethane.
- the object of the present invention is to improve the known blankets and to remedy all these problems and disadvantages by proposing a lithographic layer having significant polar components, so that substantially all of the ink retained on the layer lithographic blanket will be transferred to paper.
- the present invention relates to a layer lithographic printing blanket comprising a material polyurethane-based thermoplastic, characterized in that in this material is incorporated an ethylene vinyl acetate copolymer (EVA) to give it a polar character ensuring a transfer maximum printing ink of this layer on the paper.
- EVA ethylene vinyl acetate copolymer
- the present invention also relates to a layer lithographic printing blanket comprising a material thermoplastic, characterized in that said material is based of ethylene-propylene copolymer in which is incorporated a ethylene vinyl acetate copolymer (EVA) to give it a polar character ensuring maximum ink transfer print this layer on the paper.
- EVA ethylene vinyl acetate copolymer
- thermoplastic material at least mineral and / or organic fillers are included such that for example magnesium silicate, aluminosilicates or metal oxides used separately or as a mixture, and plasticizers such as for example those of the ester type or polymeric.
- the layer lithographic when the layer lithographic includes a thermoplastic material based on polyurethane, it comprises, per 100 parts by weight of polyurethane, up to 20 parts by weight of EVA copolymer, 0 to 30 parts by weight of fillers and 0 to 10 parts by weight of plasticizer.
- the lithographic layer of the invention may also comprise at least minus a pigment which can constitute up to approximately 2 parts in weight per 100 parts by weight of thermoplastic material.
- the lithographic layer of this invention is characterized in that its surface has a water polar component of between about 0 and 20 mJ / m 2 , a polar formamide component of between about 0 and 20 mJ / m 2 , and a polar component with dimethyl sulfoxide substantially equal to the polar component with formamide.
- the polar water component is between 5 and 15 mJ / m 2 and the polar formamide component is between 0 and 10 mJ / m 2 .
- the invention also relates to a blanket or sleeve printing process incorporating at least one lithographic layer as previously described.
- a following polar lithographic layer invention and having excellent capabilities printing and washing, is constituted, according to a example of embodiment, with polyurethane thermoplastic to which it is given a character polar thanks to the incorporation of elements or following ingredients: ethylene vinyl copolymer acetate, mineral fillers, plasticizer and possibly pigment (s).
- thermoplastic polyurethane with good chemical resistance one can use the one known as trade name Laripur 7025, Uceflex PS 4075, Resamine P1078, or Estane 58206.
- the ethylene vinyl acetate copolymer can be example a copolymer of the type known under the name Levapren commercial which has the advantage not only to have a polar character but also to play the role of a polymer plasticizer.
- EVA ethylene vinyl acetate copolymer
- different plastomers known in the art and giving adequate surface properties to the layer lithographic, such as for example polyethylene chlorosulfonated, polyetheramides of the type known as name Pebax, polyamide powder of the type known as Orgasol, and the like.
- silicate of magnesium of the type known as "Mistron Vapor"
- an aluminosilicate of the Sillitin type and metal oxides.
- the plasticizer is, as explained above, provided by the special characteristics of EVA Levapren, it being understood that we could use other specific pastifiers without departing from the the invention.
- the role of the plasticizer is essentially to adjust the elastic modulus of the lithographic layer in order to allow it to comply mechanically to the roughness of the paper and provide the flexibility required for the printing process.
- the pigment (s) incorporated in the thermoplastic polyurethane may or may be any suitable mineral or organic pigment.
- the constitution of the lithographic layer according to this invention comprises all of the above elements with the proportions by weight indicated: Thermoplastic polyurethane 100 parts by weight EVA copolymer 0 to 20 parts by weight Mineral fillers 0 to 30 parts by weight Plasticizer 0 to 10 parts by weight Pigment 0 to 2 parts by weight With certain precise values within the proportions indicated above, the surface of the lithographic layer according to this invention advantageously has a polar character.
- polar water component of between about 0 and 20 mJ / m 2
- polar formamide component of between about 0 and 20 mJ / m 2
- polar component of dimethyl sulfoxide substantially equal to the polar component with formamide
- the polar component with water should preferably be between 5 and 15 mJ / m 2 and the polar component with formamide will be between 0 and 10 mJ / m 2 .
- the polar character of the lithographic layer according to the invention is much more marked compared to the lithographic layers of the prior art, and will provide good washing ability as well as better transfer of ink to paper.
- the polarity of the surface facilitates the water-ink balance which is essential for the process offset printing, and also because the polarity of the surface makes ink adhesion to the blanket more easily reversible which, as we understand, facilitates ink transfer and washing.
- the lithographic layer is glued to the disc of the IGT device using a double-sided cloth adhesive tape.
- the printer layer and the printing medium must be regular in thickness (maximum deviations of 0.05 mm) and the total thickness must be less than 2.5 mm.
- the surface of the sample S b must be determined (blanket sample dimensions: 20x210 chain direction, for 20 mm IGT discs).
- the printing disc fitted with its printer layer is weighed before (m o ) and after (m 1 ) inking on the IGT device provided for this purpose.
- a strip of paper is placed on the rotating sector of the IGT device (paper sample dimensions 25x290 mm).
- the first has a porous and absorbent structure (similar to a sponge), while the second is smoother and "closed”.
- the papers very sensitive to humidity, are stored in the test room and must not be touched too much with your fingers.
- the strips are always printed in the same direction and on the same side, chosen arbitrarily, in order to overcome the orientation effect of the paper fibers.
- the printing conditions are kept constant in regarding pressure (250 N / cm) and speed (3.5 m / s) and estimated to be approximately constant with regard to the temperature (22 ° C) and the hygrometry (50% RH) of the local.
- the disc is then reweighed (m 2 ).
- the thickness of the test sample depends on the perimeter of the printing disc, therefore the sample / paper contact surface; the printing surface may be different from the printed surface, the development of the rotating sector being constant.
- the quantity of ink Y transferred is preferably determined from the difference in mass of the paper after (m 4 ) and before (m 3 ) printing and from the printed surface Sp.
- the ink consumption by the blanket is advantageously reduced and soiling on the lithographic layer will be very reduced since the blanket will require a relatively small proportion ink on the lithographic layer.
- a lithographic layer according to the invention can be integrated into an offset blanket intended to be mounted on an offset machine, or a sleeve that can be mounted removable on the offset machine.
- thermoplastic of the lithographic layer due to the nature thermoplastic of the lithographic layer, this can be regenerated or restored by action of heat for example, i.e. local application heat on the deteriorated part of the blanket or muff.
- the lithographic layer according to the invention having an advantageous polar character, it follows that the dispersive component is not critical with regard to improving the transfer and the cleanliness of said layer, unlike blankets with lithographic layer according to art prior.
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Abstract
Description
La présente invention a essentiellement pour objet une couche lithographique pour un blanchet d'impression de structure quelconque.The main subject of the present invention is a lithographic layer for a printing blanket of any structure.
Elle vise également un blanchet équipé de cette couche.It also targets a blanket fitted with this layer.
D'une manière générale, on sait que les procédés d'impression offset utilisent un cylindre revêtu d'une plaque offset recevant de l'eau et de l'encre pour former une image latente qui est transférée sur un blanchet comportant une couche extérieure lithographique apte à transférer l'image sur un support en papier par exemple.In general, we know that the processes offset printing machines use a cylinder coated with offset plate receiving water and ink to form a latent image which is transferred to a blanket comprising a lithographic outer layer capable of transfer the image to a paper medium for example.
Le document FR-2 152 195 décrit un blanchet d'impression
comprenant une couche lithographique. Des produits
hydroxyles sont intégrés dans la composition de cette
couche et ils procurent un caractère antistatique.
Ainsi, ce document ne prévoit pas d'améliorer le
transfert de l'encre.Document FR-2 152 195 describes a printing blanket comprising a lithographic layer. Hydroxyl products are integrated into the composition of this layer and they provide an antistatic character.
Thus, this document does not plan to improve the transfer of ink.
Les transferts de l'eau et de l'encre de la plaque offset sur la couche lithographique, puis de la couche lithographique sur le papier sont régis par un certain nombre de paramètres d'affinité pour l'eau et l'encre de la plaque offset, de la couche lithographique du blanchet, et du papier.Water and ink transfers from the offset plate on the lithographic layer, then on the layer lithographic on paper are governed by a certain number of affinity parameters for water and ink the offset plate, from the lithographic layer of the blanket, and paper.
Ces paramètres peuvent être résumés par ce que l'on appelle une énergie de surface qui se décompose en une composante dispersive et en des composantes polaires.These parameters can be summarized by what we calls a surface energy which breaks down into a dispersive component and into polar components.
A cet égard, on pourra se reporter à la publication de R.J. Good, J. Adhésion Sci. Technol, Vol. 6, No. 12, 1269 (1992). In this regard, reference may be made to the publication of R.J. Good, J. Adhesion Sci. Technol, Vol. 6, No. 12, 1269 (1992).
Brièvement parlant, les énergies de surface à caractère polaire, exprimées en millijoules par m2, et qui sont retenues pour caractériser l'aptitude au transfert de l'encre et de l'eau, sont les trois composantes suivantes :
- la composante polaire à l'eau qui permet d'évaluer la mouillabilité par l'eau et la mouillabilité par l'émulsion eau-encre,
- la composante polaire au formamide qui permet d'évaluer le caractère basique de la surface, et donc l'affinité avec les solutions de mouillage acide, et
- la composante polaire au "DMSO" (diméthyl sulfoxyde) qui permet d'évaluer le caractère acide de la surface, et donc l'affinité avec les encres ayant une légère composition polaire basique.
- the polar component with water which makes it possible to evaluate the wettability by water and the wettability by the water-ink emulsion,
- the polar component with formamide which makes it possible to evaluate the basic character of the surface, and therefore the affinity with the acid wetting solutions, and
- the polar component with "DMSO" (dimethyl sulfoxide) which makes it possible to evaluate the acid character of the surface, and therefore the affinity with inks having a slight basic polar composition.
Par ailleurs, l'énergie de surface à caractère dispersif est définie par sa composante dispersive.In addition, surface energy of a dispersive nature is defined by its dispersive component.
Dès lors, si l'on veut un bon transfert de l'encre sur le papier il faut trouver un bon compromis pour les valeurs des composantes ci-dessus et cela, encore une fois, afin d'assurer un bon transfert encre-eau depuis la plaque offset sur la couche lithographique du blanchet et depuis le blanchet sur le papier.Therefore, if we want a good transfer of ink on the paper you have to find a good compromise for values of the above components and this, again, so ensure good ink-water transfer from the plate offset on the lithographic layer of the blanket and since the blanket on paper.
La plupart des couches lithographiques connues pour blanchets d'impression sont réalisées en caoutchouc nitrile.Most of the lithographic layers known for printing blankets are made of rubber nitrile.
Une telle couche constitue une surface non polaire ou très faiblement polaire, de sorte qu'elle est faiblement mouillée par l'eau qui est polaire, si bien que l'encre a tendance à s'accumuler sur ladite surface. Ainsi la surface du blanchet se salit facilement. De plus le transfert de l'encre sur le papier est loin de se faire idéalement, si bien que l'impression sur le papier peut être non satisfaisante. Such a layer constitutes a non-polar surface or very weakly polar, so that it is weakly polar wetted by polar water, so the ink has tendency to accumulate on said surface. So the blanket surface gets dirty easily. In addition the ink on paper is far from being transferred ideally so that printing on paper can be unsatisfactory.
Car, comme on le comprend, si la composante dispersive de la couche lithographique est faible, peu d'encre en provenance de la plaque offset sera retenue par ladite couche et le procédé d'impression sera défectueux.Because, as we understand, if the dispersive component of the lithographic layer is weak, little ink in provenance of the offset plate will be retained by said layer and the printing process will be faulty.
Si par contre la composante dispersive de la couche lithographique est élevée, une grande quantité d'encre sera retenue sur le blanchet, mais son relâchement sur le papier sera difficile, et ledit blanchet deviendra sale.If, on the other hand, the dispersive component of the layer lithographic is high, a large amount of ink will be retained on the blanket, but its release on the paper will be difficult, and said blanket will become dirty.
Il faudra donc fréquemment le laver, voire le remplacer, sans parler du fait que l'impression avec un tel blanchet à couche lithographique en caoutchouc nitrile consommera beaucoup d'encre.It will therefore frequently be washed or even replaced, not to mention the fact that printing with such a blanket nitrile rubber lithographic layer will consume lots of ink.
Le document JP-63-5997 décrit un blanchet qui présente de bonnes qualités de transfert de l'encre. Ce blanchet comprend une couche lithographique en un polymère remplissant des conditions particulières en matière de gonflement avec le solvant de l'encre et de dureté. Ce polymère peut, par exemple, être du polyuréthane.Document JP-63-5997 describes a blanket which presents good ink transfer qualities. This blanket includes a lithographic layer of a polymer fulfilling specific conditions in terms of swelling with ink solvent and hardness. This polymer can, for example, be polyurethane.
La présente invention a pour but d'améliorer les blanchets connus et de remédier à tous ces problèmes et inconvénients en proposant une couche lithographique ayant des composantes polaires significatives, de sorte que sensiblement toute l'encre retenue sur la couche lithographique du blanchet sera transférée sur le papier. The object of the present invention is to improve the known blankets and to remedy all these problems and disadvantages by proposing a lithographic layer having significant polar components, so that substantially all of the ink retained on the layer lithographic blanket will be transferred to paper.
A cet effet, la présente invention a pour objet une couche lithographique pour blanchet d'impression, comprenant un matériau thermoplastique à base de polyuréthane,caractérisée en ce que dans ce matériau est incorporé un copolymère d'éthylène vinyl acétate (EVA) pour lui conférer un caractère polaire assurant un transfert maximum d'encre d'impression de cette couche sur le papier.To this end, the present invention relates to a layer lithographic printing blanket comprising a material polyurethane-based thermoplastic, characterized in that in this material is incorporated an ethylene vinyl acetate copolymer (EVA) to give it a polar character ensuring a transfer maximum printing ink of this layer on the paper.
La présente invention a également pour objet une couche lithographique pour blanchet d'impression comprenant un matériau thermoplastique, caractérisée en ce que ledit matériau est à base de copolymère éthylène-propylène dans lequel est incorporé un copolymère d'éthylène vinyl acétate (EVA) pour lui conférer un caractère polaire assurant un transfert maximum d'encre d'impression de cette couche sur le papier.The present invention also relates to a layer lithographic printing blanket comprising a material thermoplastic, characterized in that said material is based of ethylene-propylene copolymer in which is incorporated a ethylene vinyl acetate copolymer (EVA) to give it a polar character ensuring maximum ink transfer print this layer on the paper.
Selon un exemple de réalisation, dans le matériau thermoplastique sont inclus au moins des charges minérales et/ou organiques telles que par exemple du silicate de magnésium, des alumino-silicates ou des oxydes métalliques utilisés séparément ou en mélange, et des plastifiants tels que par exemple ceux du type ester ou polymérique.According to an exemplary embodiment, in the thermoplastic material at least mineral and / or organic fillers are included such that for example magnesium silicate, aluminosilicates or metal oxides used separately or as a mixture, and plasticizers such as for example those of the ester type or polymeric.
Suivant un mode de réalisation préféré,lorsque la couche lithographique comprend un matériau thermoplastique à base de polyuréthane, elle comprend, pour 100 parties en poids de polyuréthane, jusqu'à 20 parties en poids de copolymère d'EVA, 0 à 30 parties en poids de charges et 0 à 10 parties en poids de plastifiant.According to a preferred embodiment, when the layer lithographic includes a thermoplastic material based on polyurethane, it comprises, per 100 parts by weight of polyurethane, up to 20 parts by weight of EVA copolymer, 0 to 30 parts by weight of fillers and 0 to 10 parts by weight of plasticizer.
La couche lithographique de l'invention peut encore comporter au moins un pigment pouvant constituer jusqu'à environ 2 parties en poids pour 100 parties en poids de matériau thermoplastique. The lithographic layer of the invention may also comprise at least minus a pigment which can constitute up to approximately 2 parts in weight per 100 parts by weight of thermoplastic material.
Suivant encore une autre caractéristique, la couche lithographique de cette invention est caractérisée en ce que sa surface possède une composante polaire à l'eau comprise entre environ 0 et 20 mJ/m2, une composante polaire au formamide comprise entre environ 0 et 20 mJ/m2, et une composante polaire au diméthyl sulfoxyde sensiblement égale à la composante polaire au formamide.According to yet another characteristic, the lithographic layer of this invention is characterized in that its surface has a water polar component of between about 0 and 20 mJ / m 2 , a polar formamide component of between about 0 and 20 mJ / m 2 , and a polar component with dimethyl sulfoxide substantially equal to the polar component with formamide.
D'une manière préférée, la composante polaire à l'eau est comprise entre 5 et 15 mJ/m2 et la composante polaire au formamide est comprise entre 0 et 10 mJ/m2.Preferably, the polar water component is between 5 and 15 mJ / m 2 and the polar formamide component is between 0 and 10 mJ / m 2 .
L'invention concerne également un blanchet ou manchon d'impression intégrant au moins une couche lithographique telle que décrite précédemment.The invention also relates to a blanket or sleeve printing process incorporating at least one lithographic layer as previously described.
Mais d'autres caractéristiques et avantages de l'invention apparaítront mieux dans la description détaillée qui suit de la couche lithographique pour blanchet d'impression, conforme au principe de l'invention.But other features and advantages of the invention will appear better in the description detailed which follows from the lithographic layer for printing blanket, conforms to the principle of the invention.
Une couche lithographique à caractère polaire suivant l'invention et possédant d'excellentes capacités d'impression et de lavage, est constituée, suivant un exemple de réalisation, par du polyuréthane thermoplastique auquel il est conféré un caractère polaire grâce à l'incorporation des éléments ou ingrédients suivants : copolymère d'éthylène vinyl acétate, charges minérales, plastifiant et éventuellement pigment(s).A following polar lithographic layer invention and having excellent capabilities printing and washing, is constituted, according to a example of embodiment, with polyurethane thermoplastic to which it is given a character polar thanks to the incorporation of elements or following ingredients: ethylene vinyl copolymer acetate, mineral fillers, plasticizer and possibly pigment (s).
Comme polyuréthane thermoplastique présentant une bonne résistance chimique, on peut utiliser celui connu sous la dénomination commerciale Laripur 7025, Uceflex PS 4075, Resamine P1078, ou Estane 58206.As a thermoplastic polyurethane with good chemical resistance one can use the one known as trade name Laripur 7025, Uceflex PS 4075, Resamine P1078, or Estane 58206.
Le copolymère d'éthylène vinyl acétate peut être par exemple un copolymère du type connu sous la dénomination commerciale Levapren qui présente l'avantage non seulement d'avoir un caractère polaire mais aussi de jouer le rôle d'un plastifiant polymère. On pourrait aussi, sans sortir du cadre de l'invention, utiliser à la place du copolymère d'éthylène vinyl acétate (EVA) différents plastomères connus dans la technique et conférant des propriétés de surface adéquates à la couche lithographique, tels que par exemple un polyéthylène chlorosulfoné, les polyéthéramides du type connu sous la dénomination Pebax, de la poudre de polyamide du type connu sous la dénomination Orgasol, et analogues.The ethylene vinyl acetate copolymer can be example a copolymer of the type known under the name Levapren commercial which has the advantage not only to have a polar character but also to play the role of a polymer plasticizer. We could also, without departing from the scope of the invention, use at the instead of ethylene vinyl acetate copolymer (EVA) different plastomers known in the art and giving adequate surface properties to the layer lithographic, such as for example polyethylene chlorosulfonated, polyetheramides of the type known as name Pebax, polyamide powder of the type known as Orgasol, and the like.
Comme charges minérales, on peut utiliser du silicate de magnésium du type connu sous la dénomination "Mistron Vapor", un aluminosilicate du type Sillitin, et des oxydes métalliques.As mineral fillers, silicate of magnesium of the type known as "Mistron Vapor ", an aluminosilicate of the Sillitin type, and metal oxides.
Le plastifiant est, comme expliqué ci-dessus, procuré par les caractéristiques particulière de l'EVA Levapren, étant entendu que l'on pourrait utiliser d'autres pastifiants spécifiques sans sortir du cadre de l'invention. Le rôle du plastifiant est essentiellement d'ajuster le module élastique de la couche lithographique afin de permettre à celle-ci de se conformer mécaniquement aux aspérités du papier et de procurer la souplesse requise pour le procédé d'impression.The plasticizer is, as explained above, provided by the special characteristics of EVA Levapren, it being understood that we could use other specific pastifiers without departing from the the invention. The role of the plasticizer is essentially to adjust the elastic modulus of the lithographic layer in order to allow it to comply mechanically to the roughness of the paper and provide the flexibility required for the printing process.
Le ou les pigment(s) incorporé(s) au polyuréthane thermoplastique peut ou peuvent être tout pigment minéral ou organique approprié.The pigment (s) incorporated in the thermoplastic polyurethane may or may be any suitable mineral or organic pigment.
Suivant un exemple de réalisation préféré, la constitution de la
couche lithographique selon cette invention comprend tous les
éléments ci-dessus avec les proportions en poids indiquées :
On observera que la composante polaire à l'eau devra de préférence être comprise entre 5 et 15 mJ/m2 et la composante polaire au formamide sera comprise entre 0 et 10 mJ/m2.It will be observed that the polar component with water should preferably be between 5 and 15 mJ / m 2 and the polar component with formamide will be between 0 and 10 mJ / m 2 .
Pour démontrer les avantages résultant de la couche lithographique polaire selon l'invention, on a effectué des essais comparatifs avec deux couches lithographiques appartenant à l'état connu de la technique, à savoir une couche A à base d'acrylonitrile, faisant partie du blanchet selon le document US-4303721 et commercialisé par la demanderesse sous la dénomination POLYCELL, ainsi qu'une couche B conforme à la composition de l'exemple 3 du document US-5294481.To demonstrate the benefits of the layer polar lithographic according to the invention, we carried out comparative tests with two lithographic layers belonging to the known state of the art, namely a layer A based on acrylonitrile, part of the blanket according to document US-4303721 and sold by the applicant under the name POLYCELL, as well that a layer B conforming to the composition of Example 3 from document US-5294481.
Les proportions en poids des éléments constituant la
couche lithographique de l'invention ayant servi aux
essais sont les suivantes :
Dans le tableau 1 qui suit et dans lequel les énergies de
surface ont été calculées à partir de mesures d'angles de
goutte obtenues sur l'appareil KRÜSS G10, on voit que les
essais comparatifs avec la couche A et la couche B ont
consisté à mesurer la composante polaire à l'eau (a), la
composante polaire au formamide (b), et la composante
polaire au diméthyl sulfoxyde (c).
On voit tout de suite sur ce tableau que les valeurs de a, b et c sont nettement plus grandes pour le polyuréthane selon l'invention que pour les couches lithographiques antérieures A et B.We immediately see on this table that the values of a, b and c are significantly larger for the polyurethane according to the invention only for the layers previous lithographs A and B.
Ainsi, le caractère polaire de la couche lithographique selon l'invention est beaucoup plus marqué par rapport aux couches lithographiques de l'art antérieur, et procurera une bonne aptitude au lavage ainsi qu'un meilleur transfert de l'encre sur le papier.Thus, the polar character of the lithographic layer according to the invention is much more marked compared to the lithographic layers of the prior art, and will provide good washing ability as well as better transfer of ink to paper.
Ceci parce que la polarité de la surface facilite l'équilibre eau-encre qui est primordial pour le procédé d'impression offset, et aussi parce que la polarité de la surface rend l'adhésion de l'encre sur le blanchet plus facilement réversible ce qui, comme on le comprend, facilite le transfert de l'encre et le lavage.This is because the polarity of the surface facilitates the water-ink balance which is essential for the process offset printing, and also because the polarity of the surface makes ink adhesion to the blanket more easily reversible which, as we understand, facilitates ink transfer and washing.
Par ailleurs, on a procédé à des essais de transfert d'encre, par lesquels on a mesuré la quantité d'encre X (g/m2) nécessaire pour transférer Y (g/m2) d'encre sur le papier.Furthermore, ink transfer tests were carried out, by which the quantity of ink X (g / m 2 ) necessary to transfer Y (g / m 2 ) of ink was measured on the paper.
Ces essais ont été effectués de la façon suivante. These tests were carried out as follows.
Ils ont été réalisés au moyen d'une presse de laboratoire du type IGT A2, d'un dispositif d'encrage IGT AE et d'une balance de précision (à 10-4 g près).They were produced using a laboratory press of the IGT A2 type, an IGT AE inking device and a precision balance (to within 10 -4 g).
La couche lithographique est collée sur le disque de l'appareil IGT à l'aide d'un ruban adhésif double face toilé. La couche imprimante et le support d'impression doivent être réguliers en épaisseur (écarts max. de 0,05 mm) et l'épaisseur totale être inférieure à 2,5 mm. La surface de l'échantillon Sb doit être déterminée (dimensions d'échantillon du blanchet : 20x210 sens chaíne, pour les disques IGT de 20 mm).The lithographic layer is glued to the disc of the IGT device using a double-sided cloth adhesive tape. The printer layer and the printing medium must be regular in thickness (maximum deviations of 0.05 mm) and the total thickness must be less than 2.5 mm. The surface of the sample S b must be determined (blanket sample dimensions: 20x210 chain direction, for 20 mm IGT discs).
Le disque imprimant équipé de sa couche imprimante est
pesé avant (mo) et après (m1) encrage sur le dispositif
IGT prévu à cet effet. La quantité d'encre X (g/m2)
déposée sur l'échantillon vaut :
L'encre magenta Skinnex, référence 2X76, K+E a été sélectionnée. Selon les professionnels, cette dernière est difficile à imprimer, car "tirante".Skinnex magenta ink, reference 2X76, K + E has been selected. According to professionals, the latter is difficult to print because "pulling".
Une bande de papier est disposée sur le secteur tournant de l'appareil IGT (dimensions d'échantillon du papier 25x290 mm). Deux types de papier, de capillarités différentes ont été retenus : un non-couché, d'aspect mat, d'un grammage de 87 g/m2 et un couché, d'aspect brillant, de 91 g/m2. Le premier présente une structure poreuse et absorbante (analogue à une éponge), tandis que le second est plus lisse et "fermé". Les papiers, très sensibles à l'hygrométrie, sont stockés dans le local des tests et ne doivent pas être trop touchés avec les doigts. D'autre part, les bandellettes sont toujours imprimées dans le même sens et sur la même face, choisis arbitrairement, afin de s'affranchir de l'effet d'orientation des fibres du papier.A strip of paper is placed on the rotating sector of the IGT device (paper sample dimensions 25x290 mm). Two types of paper, with different capillarities, were chosen: an uncoated, matt appearance, with a grammage of 87 g / m 2 and a coated, glossy appearance, of 91 g / m 2 . The first has a porous and absorbent structure (similar to a sponge), while the second is smoother and "closed". The papers, very sensitive to humidity, are stored in the test room and must not be touched too much with your fingers. On the other hand, the strips are always printed in the same direction and on the same side, chosen arbitrarily, in order to overcome the orientation effect of the paper fibers.
Les conditions d'impression sont maintenues constantes en ce qui concerne la pression (250 N/cm) et la vitesse (3,5 m/s) et estimées à peu près constantes en ce qui concerne la température (22°C) et l'hygrométrie (50 % HR) du local.The printing conditions are kept constant in regarding pressure (250 N / cm) and speed (3.5 m / s) and estimated to be approximately constant with regard to the temperature (22 ° C) and the hygrometry (50% RH) of the local.
Le disque est alors repesé (m2).The disc is then reweighed (m 2 ).
De l'épaisseur de l'échantillon testé dépend le périmètre
du disque imprimant, donc la surface de contact
échantillon/papier ; la surface imprimante peut être
différente de la surface imprimée, le développement du
secteur tournant étant constant. On détermine de
préférence la quantité d'encre Y transférée à partir de
la différence de masse du papier après (m4) et avant (m3)
impression et de la surface imprimée Sp. La quantité
d'encre Y (g/m2) transférée sur le papier vaut :
Il est nécessaire d'effectuer plusieurs essais de transfert en incrémentant la quantité X d'encre sur le disque imprimant, de 1 à environ 5 g/m2, en le laissant plus longtemps sur le dispositif d'encrage, ou en augmentant la quantité d'encre sur ce dernier. L'exploitation des essais consiste à tracer une droite Y = f(X) dont la pente et l'ordonnée à l'origine sont déterminées par régression linéaire. Cette droite permet de déterminer l'encrage X nécessaire sur le blanchet pour obtenir une couverture Y de 1,0 et de 1,5 g/m2 sur le papier. Ces valeurs de Y sont représentatives de la couverture d'encre en impression offset et permettent d'atteindre les densités optiques requises avec ce procédé.It is necessary to carry out several transfer tests by incrementing the quantity X of ink on the printing disc, from 1 to approximately 5 g / m 2 , by leaving it longer on the inking device, or by increasing the quantity ink on it. The use of the tests consists in drawing a straight line Y = f (X) whose slope and the ordinate at the origin are determined by linear regression. This straight line makes it possible to determine the inking X necessary on the blanket to obtain a coverage Y of 1.0 and 1.5 g / m 2 on the paper. These values of Y are representative of the ink coverage in offset printing and make it possible to achieve the optical densities required with this process.
Les résultats des essais, à savoir l'encrage X nécessaire
à l'obtention du résultat, sont donnés pour les deux
types de papier et les deux niveaux d'encrage Y sur le
papier, dans le tableau 2 qui suit.
g/m2
g/m2
g/m2
g/m2
g / m 2
g / m 2
g / m 2
g / m 2
On voit que ces essais ont été effectués, comme dans le tableau précédent, sur du polyuréthane polaire selon l'invention, sur la couche lithographique connue A et sur l'autre couche connue B. En réalité, les essais ont été effectués sur des blanchets munis à leur périphérie des couches ci-dessus, c'est-à-dire avec polyuréthane selon l'invention, avec couche A et couche B. Ces essais ont été effectués respectivement sur du papier couché et sur du papier non couché sur lesquels on désire transférer une quantité d'encre correspondant à une couverture de 1 et 1,5 gramme par m2 sur le papier, comme expliqué précédemment. We see that these tests were carried out, as in the previous table, on polar polyurethane according to the invention, on the known lithographic layer A and on the other known layer B. In reality, the tests were carried out on blankets provided at their periphery with the above layers, that is to say with polyurethane according to the invention, with layer A and layer B. These tests were carried out respectively on coated paper and on uncoated paper on which wishes to transfer an amount of ink corresponding to a coverage of 1 and 1.5 grams per m 2 on the paper, as explained above.
On voit immédiatement sur ce tableau que les valeurs pour la couche lithographique contenant du polyuréthane polaire selon l'invention, sont inférieures à toutes les autres, ce qui indique que la couche lithographique selon l'invention s'avère nécessiter moins d'encre sur le blanchet pour un résultat déterminé sur le papier.We immediately see in this table that the values for the lithographic layer containing polyurethane polar according to the invention are less than all others, which indicates that the lithographic layer according to the invention turns out to require less ink on the blanket for a determined result on paper.
En d'autres termes, la consommation d'encre par le blanchet est avantageusement diminuée et les salissures sur la couche lithographique seront très réduites puisque le blanchet exigera une relativement faible proportion d'encre sur la couche lithographique.In other words, the ink consumption by the blanket is advantageously reduced and soiling on the lithographic layer will be very reduced since the blanket will require a relatively small proportion ink on the lithographic layer.
Par ailleurs, la consommation d'eau est, toute proportion gardée, moins importante, et les déformations du papier par l'eau seront réduites, étant donné que, du fait du caractère polaire de l'eau, celle-ci a fortement tendance à mouiller la surface ou couche lithographique du blanchet.By the way, water consumption is, any proportion kept, less important, and the deformations of the paper by water will be reduced, since, due to the polar nature of water, it has a strong tendency to wet the lithographic surface or layer of the blanket.
Une couche lithographique selon l'invention peut être intégrée à un blanchet offset destiné à être monté sur une machine offset, ou à un manchon qui peut être monté amovible sur la machine offset.A lithographic layer according to the invention can be integrated into an offset blanket intended to be mounted on an offset machine, or a sleeve that can be mounted removable on the offset machine.
Au surplus, on observera que, en raison de la nature thermoplastique de la couche lithographique, celle-ci pourra être régénérée ou restaurée par action de la chaleur par exemple, c'est-à-dire une application locale de la chaleur sur la partie détériorée du blanchet ou du manchon.Furthermore, it will be observed that, due to the nature thermoplastic of the lithographic layer, this can be regenerated or restored by action of heat for example, i.e. local application heat on the deteriorated part of the blanket or muff.
On observera encore que la couche lithographique selon l'invention ayant un caractère avantageusement polaire, il s'ensuit que la composante dispersive n'est pas critique en ce qui concerne l'amélioration du transfert et la propreté de ladite couche, contrairement aux blanchets avec couche lithographique selon l'art antérieur.It will also be observed that the lithographic layer according to the invention having an advantageous polar character, it follows that the dispersive component is not critical with regard to improving the transfer and the cleanliness of said layer, unlike blankets with lithographic layer according to art prior.
On a donc réalisé suivant l'invention une couche lithographique à caractère polaire présentant d'excellentes qualités au niveau de la consommation d'encre, de sa propreté et de son transfert sur le papier, et qui peut être intégrée à un blanchet ou un manchon amovible qui nécessitera des remplacements très peu fréquents.We therefore produced according to the invention a layer lithographic with polar character presenting excellent qualities in terms of consumption ink, cleanliness and transfer to the paper, and which can be integrated into a blanket or removable sleeve which will require very frequent replacements infrequent.
Bien entendu, l'invention n'est nullement limitée aux modes de réalisation décrits qui n'ont été donnés qu'à titre d'exemple.Of course, the invention is by no means limited to described embodiments which have been given only as an example.
C'est ainsi qu'à la place du polyuréthane pour la couche lithographique, on pourra utiliser un copolymère éthylène-propylène, ou encore d'autres élastomères thermoplastiques sans sortir du cadre des revendications.This is how instead of polyurethane for the layer lithographic, we can use a copolymer ethylene-propylene, or other elastomers thermoplastics without departing from the scope of the claims.
Claims (8)
- Lithographic layer for a printing blanket comprising a polyurethane based thermoplastic material, characterized in that, in this material, there is incorporated an ethylene-vinyl acetate copolymer (EVA) for giving to it a polar character ensuring a maximum transfer of printing ink from this layer onto the paper.
- Lithographic layer for a printing blanket comprising a thermoplastic material, characterized in that said material is based on an ethylene-propylene copolymer in which there is incorporated an ethylene-vinyl acetate copolymer (EVA) for giving to it a polar character ensuring a maximum transfer of printing ink from this layer onto the paper.
- Layer according to claim 1 or 2, characterized in that, in said thermoplastic material, there are included at least mineral and/or organic fillers such as for example magnesium silicate, aluminosilicates or metal oxides, separately used or in a mixture, and plasticizers such as for example those of the ester or polymeric type.
- Layer according to claims 1 and 3, characterized in that it comprises for 100 parts by weight of polyurethane, up to 20 parts by weight of EVA copolymer, 0 to 30 parts by weight of fillers and 0 to 10 parts by weight of plasticizer.
- Layer according to one of the preceding claims, characterized in that it comprises at least one pigment possibly constituting up to about 2 parts by weight, for 100 parts by weight of thermoplastic material.
- Layer according to claim 4, characterized in that its surface has a water polar component comprised between about 0 and 20 mJ/m2, a formamide polar component comprised between about 0 and 20 mJ/m2, and a dimethyl sulfoxide polar component substantially equal to the formamide polar component.
- Layer according to claim 6, characterized in that the water polar component is comprised between 5 and 15 mJ/m2 and the formamide polar component is comprised between 0 and 10 mJ/m2.
- Blanket or printing sleeve integrating at least one lithographic layer according to one of claims 1 to 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9730276T SI0824078T1 (en) | 1996-08-14 | 1997-08-04 | Lithographic layer for a printing blanket and blanket provided with such a layer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9610218 | 1996-08-14 | ||
FR9610218A FR2752393B1 (en) | 1996-08-14 | 1996-08-14 | LITHOGRAPHIC LAYER FOR PRINTING BLANCHET AND BLANCHET EQUIPPED WITH THIS LAYER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0824078A1 EP0824078A1 (en) | 1998-02-18 |
EP0824078B1 true EP0824078B1 (en) | 2001-11-07 |
Family
ID=9495064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97401874A Expired - Lifetime EP0824078B1 (en) | 1996-08-14 | 1997-08-04 | Lithographic layer for a printing blanket and blanket provided with such a layer |
Country Status (8)
Country | Link |
---|---|
US (1) | US6071620A (en) |
EP (1) | EP0824078B1 (en) |
JP (1) | JP4158951B2 (en) |
AT (1) | ATE208283T1 (en) |
CA (1) | CA2212811C (en) |
DE (1) | DE69708001T2 (en) |
FR (1) | FR2752393B1 (en) |
SI (1) | SI0824078T1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030233952A1 (en) * | 2002-06-20 | 2003-12-25 | Xerox Corporation | Phase change ink imaging component with thermoplastic layer |
US20070062394A1 (en) * | 2005-09-19 | 2007-03-22 | John Damewood | Thermoset printing blanket |
US20080057188A1 (en) * | 2006-08-29 | 2008-03-06 | Byers Joseph L | Method of making a printing blanket or sleeve including a texturized polyurethane printing surface |
US20080070042A1 (en) * | 2006-09-20 | 2008-03-20 | Day International, Inc. | Printing blanket or sleeve including thermoplastic polyurethane or thermoplastic polyurethane alloy layers |
US8409698B2 (en) * | 2007-11-30 | 2013-04-02 | Day International, Inc. | Image transfer product including a thin printing surface layer |
IT1401471B1 (en) | 2010-06-28 | 2013-07-26 | Trelleborg Engineered Systems Italy S P A | ARMOR FOR COVERING OF CYLINDERS FOR PRINTING WITH DOUBLE LAYER COMPRIMIBLE BASE POLYMERIC |
DE102010055576A1 (en) | 2010-12-21 | 2012-06-21 | Manroland Ag | Multi-layer printing blanket for use in printing cylinder in web-fed printing press to print images on metal-printing plate on e.g. paper, has sliver compound provided in material layer sheet to inhibit bacterial growth or biofilm formation |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3387074A (en) * | 1963-12-16 | 1968-06-04 | Edward D. Hill | Ink transfer member |
DE2013563A1 (en) * | 1969-03-20 | 1971-03-25 | Lawrence, Arthur Richard, 8000 München | Blanket cylinder for off-set printing press |
DE2159085C3 (en) * | 1971-11-29 | 1974-07-11 | Continental Gummi-Werke Ag, 3000 Hannover | Printing blanket, especially for offset printing |
IN144239B (en) * | 1974-10-07 | 1978-04-15 | Canathane Roller Corp | |
JPS5675896A (en) * | 1979-11-22 | 1981-06-23 | Joichi Saito | Blanket for offset printing |
JPS635997A (en) * | 1986-06-27 | 1988-01-11 | Toray Ind Inc | Blanket for offset printing |
FR2718079B1 (en) * | 1994-03-31 | 1996-05-15 | Rollin Sa | Improved printing blanket and printing cylinder equipped with this blanket. |
-
1996
- 1996-08-14 FR FR9610218A patent/FR2752393B1/en not_active Expired - Fee Related
-
1997
- 1997-08-04 EP EP97401874A patent/EP0824078B1/en not_active Expired - Lifetime
- 1997-08-04 AT AT97401874T patent/ATE208283T1/en not_active IP Right Cessation
- 1997-08-04 SI SI9730276T patent/SI0824078T1/en unknown
- 1997-08-04 DE DE69708001T patent/DE69708001T2/en not_active Expired - Lifetime
- 1997-08-12 CA CA002212811A patent/CA2212811C/en not_active Expired - Fee Related
- 1997-08-13 US US08/910,745 patent/US6071620A/en not_active Expired - Lifetime
- 1997-08-14 JP JP21937097A patent/JP4158951B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2212811C (en) | 2006-03-21 |
JP4158951B2 (en) | 2008-10-01 |
DE69708001D1 (en) | 2001-12-13 |
CA2212811A1 (en) | 1998-02-14 |
FR2752393A1 (en) | 1998-02-20 |
ATE208283T1 (en) | 2001-11-15 |
US6071620A (en) | 2000-06-06 |
DE69708001T2 (en) | 2002-08-29 |
SI0824078T1 (en) | 2002-06-30 |
FR2752393B1 (en) | 1998-10-09 |
EP0824078A1 (en) | 1998-02-18 |
JPH10157324A (en) | 1998-06-16 |
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