EP0022033B1 - Lithographic printing plates with hydrophilic surface matted with a thin chrome layer - Google Patents
Lithographic printing plates with hydrophilic surface matted with a thin chrome layer Download PDFInfo
- Publication number
- EP0022033B1 EP0022033B1 EP19800400982 EP80400982A EP0022033B1 EP 0022033 B1 EP0022033 B1 EP 0022033B1 EP 19800400982 EP19800400982 EP 19800400982 EP 80400982 A EP80400982 A EP 80400982A EP 0022033 B1 EP0022033 B1 EP 0022033B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromium
- layer
- hydrophilic surface
- plate
- micrometer
- 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
Links
Classifications
-
- 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
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/04—Printing plates or foils; Materials therefor metallic
- B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
- B41N1/10—Printing plates or foils; Materials therefor metallic for lithographic printing multiple
-
- 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
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/04—Printing plates or foils; Materials therefor metallic
- B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
Definitions
- the present invention relates to new offset plates, the hydrophylic surface of which has been made "matt thanks to a thin layer of chromium.
- offset reproduction methods use plates having a surface of hydrophilic nature. This same surface must advantageously be matt, this mattness being advantageous on the one hand, to facilitate the control work at the time of printing and on the other hand, to facilitate the attachment, on a surface, of a photosensitive layer .
- This mattness can be obtained by treating the support of the plate or the surface in a material of hydrophilic nature by methods which call for an attack on said surface, either mechanically, chemically or electrochemically.
- chromium has been widely described for producing the hydrophilic surface of an offset plate.
- the chrome layers employed have notable advantages with regard to their hardness, their hydrophilicity and possibly their appearance. Indeed, these chromium layers can have a mat surface.
- electrochemically obtain a chromium layer with a mat surface two methods are known, one consisting in using an electrolytic bath at low temperature (5 to 8 ° C. for example) and the other consisting in using an electrolytic bath at lower temperature normal (25 to 35 ° C) but by interrupting the electric current while the said deposition is carried out. But in all known cases the chromium layer (with a shiny or mat surface) which must play the role of aquaphile layer of the offset plates must have a notable thickness (clearly greater than 1 micrometer and generally from 1.5 to 2.8 micrometers ).
- GB-A-1 172 517 describes a plate whose substrate is made of copper or brass; this substrate being covered with a spongy layer of chromium, itself covered with an ink-absorbing photosensitive layer.
- the specialist knows that the deposited chromium layer is necessarily of a thickness greater than 1.5 micrometers (thickness explained in said patent).
- hydrophilic chromium layers less than 1 micrometer thick could possibly be deposited on supports.
- specialists are well aware that the very thin layers recommended cannot play their role of hard aquaphilic layers because they are scratched too easily and are often porous, thus revealing an underlying surface with properties which are unacceptable in offset reproduction. .
- This is what is described in particular in BE-A-779 229 where, in addition, the chromium oxide chromium layer used as an aquaphile surface is of a shiny nature therefore does not allow sufficient adhesion of a photosensitive layer .
- the invention therefore relates to offset plates with a hydrophilic metallic surface and an encrophilic surface obtained from a photosensitive printing layer, comprising a steel support having a glossy and smooth hydrophilic surface, characterized in that said glossy hydrophilic surface is at least partially covered. a layer of matt and porous chromium having a thickness of less than 1 micrometer.
- the invention consists in depositing on a surface having hydrophilic properties which can be used in the sense of offset, a very thin layer of matt chromium, the relative porosity and fragility of which will be accepted precisely because the underlying surface is hydrophilic and encrophobic , but which will be used to make the surface of the final material "matt".
- hydrophilic surfaces which can be made matt using the invention are all the surfaces which, to date, have been considered as hydrophilic surfaces usable in offset plates.
- chromium With a thin layer of chromium, it is possible to matte shiny or semi-shiny surfaces of hard materials such as stainless steel, tin-nickel, chromium itself, chrome surfaces. -chromium oxide (which is coated with steel for certain cans), nickel-phosphorus, tin alloys and nickel alloys.
- a matte appearance plate is obtained.
- the plate is covered with a layer (approximately 1.8 micrometer thickness) of photosensitive commercial printer (PCAS). After drying (3 min at 45 ° C and 5 min at 85 ° C) the plate is ready.
- PCAS photosensitive commercial printer
- the plate is then used as known in offset processes: insolation, rearing of soluble parts, exfoliation, etc.
- the plate is thus covered with a smooth, hard and shiny layer of chromium which will provide it with good protection during handling.
- This plate is then immersed in an electrolytic chromium bath with a composition identical to that of the bath described above, but it is operated at a temperature of 28 ° C. and is deposited, under 30 A by square decimetre, on only one of the faces of the plate, a matt chrome thickness of 0.4 micrometer.
- a plate is thus obtained protected on all its faces by a layer of smooth chrome and which comprises, on one of its faces, a surface of matt chrome usable in offset.
- a photosensitive printer layer is then deposited on the mat surface and a ready-made offset plate is obtained.
- a chromed steel plate sold by the company SOLLAC is used as a starting plate.
- the plate After degreasing hot (65 ° C) in a sodium carbonate bath (100 g / 1), the plate being cathode, the plate is introduced into a chromium bath in order to achieve, on one of its faces, the deposit of a thin layer (0.3 micrometer of matt chromium).
Description
La présente invention concerne de nouvelles plaques offset dont la surface hydrophyle a été rendue « mate grâce à une couche mince de chrome.The present invention relates to new offset plates, the hydrophylic surface of which has been made "matt thanks to a thin layer of chromium.
On sait que les procédés de reproduction offset utilisent des plaques présentant une surface de nature hydrophile. Cette même surface doit avantageusement être mate, cette matité étant intéressante d'une part, pour faciliter le travail de contrôle au moment de l'impression et d'autre part, pour faciliter l'accrochage, sur une surface, d'une couche photosensible.It is known that offset reproduction methods use plates having a surface of hydrophilic nature. This same surface must advantageously be matt, this mattness being advantageous on the one hand, to facilitate the control work at the time of printing and on the other hand, to facilitate the attachment, on a surface, of a photosensitive layer .
Cette matité peut s'obtenir en traitant le support de la plaque ou la surface en un matériau de nature hydrophile par des procédés qui font appel à une attaque de ladite surface, soit mécaniquement, soit chimiquement, soit électrochimiquement.This mattness can be obtained by treating the support of the plate or the surface in a material of hydrophilic nature by methods which call for an attack on said surface, either mechanically, chemically or electrochemically.
On a de plus largement décrit l'utilisation du chrome pour la réalisation de la surface hydrophile d'une plaque offset. Les couches de chromes employées présentent des avantages notables en ce qui concerne leur dureté, leur hydro- philie et éventuellement leur aspect. En effet, ces couches de chrome peuvent présenter une surface mate. Pour obtenir électrochimiquement une couche de chrome à surface mate, on connaît deux procédés, l'un consistant à utiliser un bain électrolytique à basse température (5 à 8 °C par exemple) et l'autre consistant à utiliser un bain électrolytique à température inférieure à la normale (25 à 35 °C) mais en réalisant une interruption du courant électrique pendant que l'on effectue ledit dépôt. Mais dans tous les cas connus la couche de chrome (à surface brillante ou mate) qui doit jouer le rôle de couche aquaphile des plaques offset doit avoir une épaisseur notable (nettement supérieure à 1 micromètre et généralement de 1,5 à 2,8 micromètres).In addition, the use of chromium has been widely described for producing the hydrophilic surface of an offset plate. The chrome layers employed have notable advantages with regard to their hardness, their hydrophilicity and possibly their appearance. Indeed, these chromium layers can have a mat surface. To electrochemically obtain a chromium layer with a mat surface, two methods are known, one consisting in using an electrolytic bath at low temperature (5 to 8 ° C. for example) and the other consisting in using an electrolytic bath at lower temperature normal (25 to 35 ° C) but by interrupting the electric current while the said deposition is carried out. But in all known cases the chromium layer (with a shiny or mat surface) which must play the role of aquaphile layer of the offset plates must have a notable thickness (clearly greater than 1 micrometer and generally from 1.5 to 2.8 micrometers ).
Ainsi, par exemple, le GB-A-1 172 517 décrit une plaque dont le substrat est en cuivre ou en laiton ; ce substrat étant recouvert d'une couche spongieuse de chrome, elle même recouverte d'une couche photosensible encrophile. Compte tenu des propriétés du cuivre et du laiton, le spécialiste sait que la couche de chrome déposée est nécessairement d'une épaisseur supérieure à 1,5 micromètre (épaisseur explicitée dans ledit brevet).Thus, for example, GB-A-1 172 517 describes a plate whose substrate is made of copper or brass; this substrate being covered with a spongy layer of chromium, itself covered with an ink-absorbing photosensitive layer. Given the properties of copper and brass, the specialist knows that the deposited chromium layer is necessarily of a thickness greater than 1.5 micrometers (thickness explained in said patent).
On a déjà suggéré que l'on pourrait éventuellement déposer sur des supports, des couches hydrophiles de chrome d'épaisseur inférieure à 1 micromètre. Mais compte tenu des exemples fournis, les spécialistes savent bien que les couches très minces préconisées ne peuvent jouer leur rôle de couches dures aquaphiles car elles se rayent trop facilement et sont souvent poreuses laissant ainsi apparaître une surface sous jacente aux propriétés inacceptables dans la reproduction offset. C'est ce que l'on décrit notamment dans le BE-A-779 229 où, de plus, la couche de chrome oxyde de chrome utilisée comme surface aquaphile est de nature brillante donc ne permet pas un accrochage suffisant d'une couche photosensible.It has already been suggested that hydrophilic chromium layers less than 1 micrometer thick could possibly be deposited on supports. However, taking into account the examples provided, specialists are well aware that the very thin layers recommended cannot play their role of hard aquaphilic layers because they are scratched too easily and are often porous, thus revealing an underlying surface with properties which are unacceptable in offset reproduction. . This is what is described in particular in BE-A-779 229 where, in addition, the chromium oxide chromium layer used as an aquaphile surface is of a shiny nature therefore does not allow sufficient adhesion of a photosensitive layer .
Il a été trouvé, et c'est là l'objet de la présente invention, qu'il est possible de rendre mate la surface d'un matériau hydrophile brillant, utilisable comme surface hydrophile d'une plaque offset, en déposant sur cette surface une couche d'épaisseur inférieure à 1 micromètre et de préférence inférieure à 0,5 micromètre de chrome mat et poreux.It has been found, and this is the object of the present invention, that it is possible to make the surface of a glossy hydrophilic material, usable as the hydrophilic surface of an offset plate, by depositing on this surface. a layer of thickness less than 1 micrometer and preferably less than 0.5 micrometer of matt and porous chromium.
L'invention concerne donc des plaques offset à surface hydrophile métallique et à surface encrophile obtenue à partir d'une couche photosensible imprimante, comportant un support acier présentant une surface hydrophile brillante et lisse caractérisées en ce que ladite surface hydrophile brillante est au moins partiellement recouverte d'une couche de chrome mat et poreux ayant une épaisseur inférieure à 1 micromètre.The invention therefore relates to offset plates with a hydrophilic metallic surface and an encrophilic surface obtained from a photosensitive printing layer, comprising a steel support having a glossy and smooth hydrophilic surface, characterized in that said glossy hydrophilic surface is at least partially covered. a layer of matt and porous chromium having a thickness of less than 1 micrometer.
L'invention consiste à déposer sur une surface présentant des propriétés hydrophiles utilisables au sens de l'offset, une très mince couche de chrome mat, dont on acceptera la porosité et la fragilité relatives précisément parce que la surface sous-jacente est hydrophile et encrophobe, mais que l'on utilisera pour rendre « mate » la surface du matériau final.The invention consists in depositing on a surface having hydrophilic properties which can be used in the sense of offset, a very thin layer of matt chromium, the relative porosity and fragility of which will be accepted precisely because the underlying surface is hydrophilic and encrophobic , but which will be used to make the surface of the final material "matt".
Les surfaces hydrophiles que l'on peut rendre « mate en utilisant l'invention sont toutes les surfaces qui, à ce jour, ont été considérées comme des surfaces hydrophiles utilisables dans les plaques offset.The hydrophilic surfaces which can be made matt using the invention are all the surfaces which, to date, have been considered as hydrophilic surfaces usable in offset plates.
Ainsi, on peut « mater à à l'aide d'une couche mince de chrome des surfaces brillantes ou semi- brillantes de matériaux durs tels que l'acier inoxydable, l'étain-nickel, le chrome lui-même, les surfaces chrome-oxyde de chrome (dont on revêt l'acier pour certaines boîtes de conserves), le nickel-phosphore, les alliages d'étain et les alliages de nickel.Thus, with a thin layer of chromium, it is possible to matte shiny or semi-shiny surfaces of hard materials such as stainless steel, tin-nickel, chromium itself, chrome surfaces. -chromium oxide (which is coated with steel for certain cans), nickel-phosphorus, tin alloys and nickel alloys.
On peut ainsi éventuellement « mater des surfaces de matériaux brillants plus mous tels que le zinc ou l'étain ; cependant, étant donné le caractère « mou de ces métaux (notamment de l'étain) il est alors souhaitable de ne mater que la surface de couches d'étain minces (c'est-à-dire d'épaisseur nettement inférieure à 1 micromètre qui sont déposées sur une surface dure).It is thus possible, optionally, to matt surfaces of softer shiny materials such as zinc or tin; however, given the “soft” nature of these metals (especially tin), it is then desirable to mat only the surface of thin layers of tin (that is to say of thickness clearly less than 1 micrometer which are deposited on a hard surface).
Pour obtenir un dépôt mat de chrome selon l'invention, on utilise les techniques électrochimiques connues impliquant soit l'emploi d'un bain froid soit l'emploi d'une coupure de courant lors du dépôt. Cependant, on a noté que l'on pouvait obtenir directement le dépôt de chrome mat en utilisant pour les bains une température inférieure à la normale (25-35 °C) et sans coupure de courant, lorsque le dépôt de chrome est réalisé sur une surface de chrome ou d'étain.To obtain a matt deposit of chromium according to the invention, use is made of known electrochemical techniques involving either the use of a cold bath or the use of a power cut during deposition. However, it was noted that the deposit of matt chromium could be obtained directly by using for the baths a temperature below normal (25-35 ° C) and without power failure, when the chromium deposit is carried out on a chrome or tin surface.
Les exemples non limitatifs suivants illustrent l'invention.The following nonlimiting examples illustrate the invention.
On utilise une plaque en acier inoxydable d'épaisseur 35/100 présentant une surface brillante. Cette plaque est dégraissée en anode, rincée puis immergée dans un bain de chrome classique (250 g/I d'anhydride chromique et 2,5 g d'acide sulfurique par litre-température 28°). La plaque est reliée à la cathode ; le courant (15A dcm 2) est mis 15 secondes après l'immersion de la plaque et est maintenu jusqu'à ce que le dépôt de chrome ait atteint 0,3 micromètre d'épaisseur avec une coupure de courant 15 secondes après le début du dépôt de chrome.We use a stainless steel plate 35/100 thick with a shiny surface. This plate is degreased in anode, rinsed and then immersed in a conventional chromium bath (250 g / I of chromic anhydride and 2.5 g of sulfuric acid per liter-temperature 28 °). The plate is connected to the cathode; the current (15A d cm 2 ) is switched on 15 seconds after immersion of the plate and is maintained until the chromium deposit has reached 0.3 micrometer in thickness with a power cut 15 seconds after the start of the chromium deposit.
On obtient une plaque d'aspect mate. La plaque est recouverte d'une couche (épaisseur environ, 1,8 micromètre) photosensible imprimante du commerce (PCAS). Après séchage (3 mn à 45 °C et 5 mn à 85 °C) la plaque est prête.A matte appearance plate is obtained. The plate is covered with a layer (approximately 1.8 micrometer thickness) of photosensitive commercial printer (PCAS). After drying (3 min at 45 ° C and 5 min at 85 ° C) the plate is ready.
La plaque est ensuite utilisée comme connu dans les procédés offset : insolation, enlevage des parties solubles, gommage etc...The plate is then used as known in offset processes: insolation, rearing of soluble parts, exfoliation, etc.
La plaque est alors utilisée sur machine offset. On a constaté :
- - que la couche imprimante est parfaitement accrochée sur la surface de chrome mat,
- - que les parties hydrophiles mises à nues sont bien encrophobes.
- - that the printer layer is perfectly attached to the matt chrome surface,
- - that the hydrophilic parts exposed are clearly encrophobic.
Au bout de 60 000 feuilles tirées, on a constaté que le chrome mat avait été rayé par un objet dur contenu dans le papier ; cette rayure laissait apparaître l'acier inoxydable mais le tirage n'en n'a pas été affecté.After 60,000 sheets drawn, it was found that the matt chrome had been scratched by a hard object contained in the paper; this scratch revealed the stainless steel but the draft was not affected.
On prend une plaque en acier qualité offset de la Société USINOR épaisseur 35/100.We take a steel plate offset quality from the company USINOR thickness 35/100.
Après dégraissage, rinçage, décapage rinçage on dépose sur les deux côtés de la plaque une épaisseur de 0 micromètre 6 de chrome brillant et dur dans un bain composé ainsi :
- 250 gr/I anhydride chromique,
- 2 g/I d'acide sulphurique,
- T°-45°
- densité-15A dcm 2.
- 250 gr / I chromic anhydride,
- 2 g / I sulfuric acid,
- T ° -45 °
- density-15A d cm 2 .
Sur ces deux faces, la plaque est ainsi recouverte d'une couche lisse, dure et brillante de chrome qui lui fournira une bonne protection durant les manipulations.On these two faces, the plate is thus covered with a smooth, hard and shiny layer of chromium which will provide it with good protection during handling.
On immerge alors cette plaque dans un bain électrolytique de chrome de composition identique à celle du bain décrit ci-dessus mais on opère à une température de 28 °C et on dépose, sous 30 A par décimètre carré, sur une seule des faces de la plaque, une épaisseur de chrome mat de 0,4 micromètre.This plate is then immersed in an electrolytic chromium bath with a composition identical to that of the bath described above, but it is operated at a temperature of 28 ° C. and is deposited, under 30 A by square decimetre, on only one of the faces of the plate, a matt chrome thickness of 0.4 micrometer.
On obtient ainsi une plaque protégée sur toutes ses faces par une couche de chrome lisse et qui comporte, sur une de ses faces, une surface de chrome mat utilisable en offset. On dépose ensuite sur la surface mat une couche photosensible imprimante et on obtient une plaque offset prête à l'emploi.A plate is thus obtained protected on all its faces by a layer of smooth chrome and which comprises, on one of its faces, a surface of matt chrome usable in offset. A photosensitive printer layer is then deposited on the mat surface and a ready-made offset plate is obtained.
On utilise comme plaque de départ, une plaque en acier chromé commercialisé par la Société SOLLAC.As a starting plate, a chromed steel plate sold by the company SOLLAC is used.
Après dégraissage à chaud (65 °C) dans un bain de carbonate de sodium (100 g/1), la plaque étant en cathode, la plaque est introduite dans un bain de chrome en vue de réaliser, sur une de ses faces, le dépôt d'une couche mince (0,3 micromètre de chrome mat).After degreasing hot (65 ° C) in a sodium carbonate bath (100 g / 1), the plate being cathode, the plate is introduced into a chromium bath in order to achieve, on one of its faces, the deposit of a thin layer (0.3 micrometer of matt chromium).
On a réalisé des essais analogues en utilisant comme produit de départ :
- - une plaque en acier (35/100 d'épaisseur) de la Société USINOR sur laquelle on a déposé au préalable une couche de 0,9 micromètre d'alliage étain-nickel, une plaque en acier étamé (épaisseur 35/100, référence EL commercialisée par la Société « LE FER BLANC ») ayant 2,8 g d'étain au mètre carré sur chacune de ses faces.
- - une plaque en acier de 35/100 dont la surface a été sablée ; sur telle plaque le dépôt de chrome mat selon l'invention (épaisseur inférieure à 1 micromètre) peut être réalisé sans utilisation d'une coupure de courant pendant l'électrolyse.
- - une plaque en acier (35/100 d'épaisseur) de la Société USINOR sur laquelle on a déposé des deux côtés de la plaque un chrome 0,6 micromètre du type micro-craké fourni par les établissements WALBERG référence W.S.A. 2300 et travaillant à 42°. Ce type de chrome a une excellente résistance à la corrosion.
- - une plaque en acier (35/100 d'épaisseur) de la Société USINOR sur laquelle on a déposé des deux côtés de la plaque un chrome crack-free 0,6 micromètre d'épaisseur des établissement WALBERG référence W.S.A. 2650 et travaillant à 65°. Ce type de chrome a une excellente résistance à la corrosion.
- - a steel plate (35/100 thick) from the company USINOR on which a layer of 0.9 micrometer tin-nickel alloy has been previously deposited, a tinned steel plate (thickness 35/100, reference EL marketed by the company "LE FER BLANC") having 2.8 g of tin per square meter on each of its faces.
- - a 35/100 steel plate whose surface has been sanded; on such a plate the deposit of matt chromium according to the invention (thickness less than 1 micrometer) can be carried out without using a power cut during the electrolysis.
- - a steel plate (35/100 thick) from the company USINOR on which was deposited on both sides of the plate a 0.6 micrometer chromium of the micro-craké type supplied by WALBERG establishments, reference WSA 2300 and working on 42 °. This type of chromium has excellent resistance to corrosion.
- - a steel plate (35/100 thick) from the company USINOR on which was deposited on both sides of the plate a crack-free chrome 0.6 micrometer thick from WALBERG establishments reference WSA 2650 and working at 65 °. This type of chromium has excellent resistance to corrosion.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7917153A FR2460211A1 (en) | 1979-07-02 | 1979-07-02 | NEW OFFSET PLATE WITH SURFACE MATT CHROMED |
| FR7917153 | 1979-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0022033A1 EP0022033A1 (en) | 1981-01-07 |
| EP0022033B1 true EP0022033B1 (en) | 1984-09-05 |
Family
ID=9227397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19800400982 Expired EP0022033B1 (en) | 1979-07-02 | 1980-06-30 | Lithographic printing plates with hydrophilic surface matted with a thin chrome layer |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0022033B1 (en) |
| JP (1) | JPS5637192A (en) |
| BR (1) | BR8004111A (en) |
| CA (1) | CA1133755A (en) |
| DE (1) | DE3069101D1 (en) |
| ES (1) | ES8200273A1 (en) |
| FR (1) | FR2460211A1 (en) |
| MX (1) | MX156999A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2480676A1 (en) * | 1980-04-16 | 1981-10-23 | Nouel Jean Marie | NEW OFFSET STEEL PLATES USING CHROME OXIDE SURFACES |
| FR2529511A1 (en) * | 1982-07-02 | 1984-01-06 | Nouel Jean Marie | OFFSET PLATES BASED STEEL AND CHROME MULTILAYER |
| JPS6131355A (en) * | 1984-07-20 | 1986-02-13 | 工業技術院長 | Graphite-boron carbide sliding member |
| US4911075A (en) * | 1988-08-19 | 1990-03-27 | Presstek, Inc. | Lithographic plates made by spark discharges |
| JPH02131992A (en) * | 1989-06-14 | 1990-05-21 | Konica Corp | Support for lithographic printing plate |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB475902A (en) * | 1936-05-29 | 1937-11-29 | Arthur Ronald Trist | Improvements in and relating to printing plates for lithography |
| GB640470A (en) * | 1947-09-04 | 1950-07-19 | Coates Brothers & Co | Improvements in the manufacture of lithographic printing plates |
| DE806315C (en) * | 1949-10-18 | 1951-06-14 | Roman Freundorfer | Offset printing plate and method of making the same |
| FR82759E (en) * | 1962-09-27 | 1964-04-17 | Le Quadrimetal Offset Sa Pour | Offset printing process and resulting industrial products |
| GB1172517A (en) * | 1965-12-02 | 1969-12-03 | Rotaprint Ltd | Photochemical Production of Plates for Offset Lithography |
| BE779229A (en) * | 1972-02-10 | 1972-05-30 | Centre Rech Metallurgique | Offset printing plates - have a steel support with a chromium layer and a radiation sensitive layer,prodn |
| JPS5131507A (en) * | 1974-09-11 | 1976-03-17 | Fuji Photo Film Co Ltd | OFUSETSUTOINSATSUBANYOSHIJITAI |
| FR2442722A1 (en) * | 1978-11-29 | 1980-06-27 | Nouel Jean Marie | NEW AQUAPHILE LAYER FOR OFFSET PRINTING PLATES AND OBTAINED PLATES |
-
1979
- 1979-07-02 FR FR7917153A patent/FR2460211A1/en active Granted
-
1980
- 1980-06-26 CA CA354,878A patent/CA1133755A/en not_active Expired
- 1980-06-30 EP EP19800400982 patent/EP0022033B1/en not_active Expired
- 1980-06-30 DE DE8080400982T patent/DE3069101D1/en not_active Expired
- 1980-06-30 BR BR8004111A patent/BR8004111A/en not_active IP Right Cessation
- 1980-07-01 JP JP8858780A patent/JPS5637192A/en active Granted
- 1980-07-01 MX MX18298980A patent/MX156999A/en unknown
- 1980-07-01 ES ES492985A patent/ES8200273A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES492985A0 (en) | 1981-10-16 |
| EP0022033A1 (en) | 1981-01-07 |
| FR2460211A1 (en) | 1981-01-23 |
| DE3069101D1 (en) | 1984-10-11 |
| JPS5637192A (en) | 1981-04-10 |
| JPH0322314B2 (en) | 1991-03-26 |
| MX156999A (en) | 1988-10-19 |
| ES8200273A1 (en) | 1981-10-16 |
| FR2460211B1 (en) | 1984-07-06 |
| CA1133755A (en) | 1982-10-19 |
| BR8004111A (en) | 1981-01-21 |
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