CA1133755A - Offset plates with a hydrophilic surface given a dull finish by way of a thin chromium layer - Google Patents
Offset plates with a hydrophilic surface given a dull finish by way of a thin chromium layerInfo
- Publication number
- CA1133755A CA1133755A CA354,878A CA354878A CA1133755A CA 1133755 A CA1133755 A CA 1133755A CA 354878 A CA354878 A CA 354878A CA 1133755 A CA1133755 A CA 1133755A
- Authority
- CA
- Canada
- Prior art keywords
- chromium
- layer
- dull
- plate
- hydrophilic surface
- 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
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to new offset printing plates comprising a shiny hydrophilic surface known per se as suitable for use as the hydrophilic surface of an offset plate, said surface being at least partly coated with a dull and porous layer of chromium, said layer having a thickness less than 1µ and preferab-ly less than about 0.5 µ.
The invention relates to new offset printing plates comprising a shiny hydrophilic surface known per se as suitable for use as the hydrophilic surface of an offset plate, said surface being at least partly coated with a dull and porous layer of chromium, said layer having a thickness less than 1µ and preferab-ly less than about 0.5 µ.
Description
~.13375~
The pre~ent invention relate~ to ~ew o~-set plates whose hydrophilic surface has been given a "dull finish" by way of a thin chromium layer.
It is known that offset printing proces~e3 use plates having a surface of hydrophilic nature. Said surface should advantageously be given a dull finish, as said dull finish advantageously helps the control work at printing time, on the one hand, and the adherence to ~aid surface of a photosensitive layer, on the other hand.
Said dull finish can be obtained by treat-; ing the plate support or the ~urface made from a hydro-philic material with proce~ses wher~by the said surface is etched either mechanically, or chemically, or electro-chemically.
The use of chromium to produce the hydro-philic surface of an offset plate has also been widely described. The chromium layers used have considerable advantages where hardness, water-acceptance and appearance are concerned. Indeed, 3aid chromium layers can present a dull surface. Two methods are known to produce~ electrochemically, a chromium layer with a dull surface~ one consisting in using an electrolytic bath at low temperature (between 5 and 80C for example) and the other consi~ting in using an electrolytic bath . at a temperature below normal (between 25 and 35C) but with an electrical current cut when the deposit is e*fected. But in all the known ca es, the chromium layer ; (whether with a shiny or a dull ~urface) which is to play the part of the water-accepting layer in o-ffset plates should have a sub~tantial thickness (definitely over 1 u and~generally between 1.5 and 2.8 ~).
It has already been suggested to depo3it onto support3, hydrophilic layers of chromium of le~
than 1 ~u thickness. But con~iderins the examples ,, ~, ' . i ~
: . .
, , , , - . -. :~ ~,, . . . - : :. ~ :
- ;. . :: - :- :
~3375S
furni~hed, speciali~ts are well aware that the very thin layers proposed cannot act as water-acceptin$
hard layers as they 3cratch too easily and are often porous, thus expo~ing a sub-jacent surface the proper-ties of which are unacceptable in offset printing.
It has been found and thi~ i~ preciselythe object of the present invention, that it is possible to dull the shiny surface of a hydrophilic material, which surface is to be used as hydrophilic surface for an offset plate, by depositin~ thereon a layer of dull and porous chromium le~s than 1 ~ thick, and pre~erably less than 005 p thick The invention therefore consi~ts in depo -iting over a surface showing the hydrophilic propertie3 re~uired in offset printinS, a very thin layer of dull chromium the relative porosity and fragility of which will be accepted precl~ely because the 3ub-jacent surface is a water-accepting and inl~-refusing ~urface, but which will be u3ed to give A "dull finish~' to the surface of the final material.
Hydrophilic surfaces which can be "dulled"
accordi~S to the invention are all surface~ which, heretofore, have been con3idered as hydrophilic surface~
suitable for offset platesO
For example, it i~ po~ible to ~dull~
with a fine layer of chromium~ ~hiny or semi-shiny surfaces of hard materlals ~uch as stainles3 steel, nickel-tin, chromium itself, chromium-chromium oxide surfaces ~used a~ a coatin$ on steel in certain type~
of cans), phosphoru~-nickel, tin alloys and nickel ; alloy~.
It is al~o possibla, if neces3ary, to ~dull~ the surface~ of softer shiny material~ such as tin or ~inc; but considering the "30ft" nature of the~e metals (and in particular of tin~ it i5 preferable to dull only the surf~ce of the thin layers of tin (i.e.
The pre~ent invention relate~ to ~ew o~-set plates whose hydrophilic surface has been given a "dull finish" by way of a thin chromium layer.
It is known that offset printing proces~e3 use plates having a surface of hydrophilic nature. Said surface should advantageously be given a dull finish, as said dull finish advantageously helps the control work at printing time, on the one hand, and the adherence to ~aid surface of a photosensitive layer, on the other hand.
Said dull finish can be obtained by treat-; ing the plate support or the ~urface made from a hydro-philic material with proce~ses wher~by the said surface is etched either mechanically, or chemically, or electro-chemically.
The use of chromium to produce the hydro-philic surface of an offset plate has also been widely described. The chromium layers used have considerable advantages where hardness, water-acceptance and appearance are concerned. Indeed, 3aid chromium layers can present a dull surface. Two methods are known to produce~ electrochemically, a chromium layer with a dull surface~ one consisting in using an electrolytic bath at low temperature (between 5 and 80C for example) and the other consi~ting in using an electrolytic bath . at a temperature below normal (between 25 and 35C) but with an electrical current cut when the deposit is e*fected. But in all the known ca es, the chromium layer ; (whether with a shiny or a dull ~urface) which is to play the part of the water-accepting layer in o-ffset plates should have a sub~tantial thickness (definitely over 1 u and~generally between 1.5 and 2.8 ~).
It has already been suggested to depo3it onto support3, hydrophilic layers of chromium of le~
than 1 ~u thickness. But con~iderins the examples ,, ~, ' . i ~
: . .
, , , , - . -. :~ ~,, . . . - : :. ~ :
- ;. . :: - :- :
~3375S
furni~hed, speciali~ts are well aware that the very thin layers proposed cannot act as water-acceptin$
hard layers as they 3cratch too easily and are often porous, thus expo~ing a sub-jacent surface the proper-ties of which are unacceptable in offset printing.
It has been found and thi~ i~ preciselythe object of the present invention, that it is possible to dull the shiny surface of a hydrophilic material, which surface is to be used as hydrophilic surface for an offset plate, by depositin~ thereon a layer of dull and porous chromium le~s than 1 ~ thick, and pre~erably less than 005 p thick The invention therefore consi~ts in depo -iting over a surface showing the hydrophilic propertie3 re~uired in offset printinS, a very thin layer of dull chromium the relative porosity and fragility of which will be accepted precl~ely because the 3ub-jacent surface is a water-accepting and inl~-refusing ~urface, but which will be u3ed to give A "dull finish~' to the surface of the final material.
Hydrophilic surfaces which can be "dulled"
accordi~S to the invention are all surface~ which, heretofore, have been con3idered as hydrophilic surface~
suitable for offset platesO
For example, it i~ po~ible to ~dull~
with a fine layer of chromium~ ~hiny or semi-shiny surfaces of hard materlals ~uch as stainles3 steel, nickel-tin, chromium itself, chromium-chromium oxide surfaces ~used a~ a coatin$ on steel in certain type~
of cans), phosphoru~-nickel, tin alloys and nickel ; alloy~.
It is al~o possibla, if neces3ary, to ~dull~ the surface~ of softer shiny material~ such as tin or ~inc; but considering the "30ft" nature of the~e metals (and in particular of tin~ it i5 preferable to dull only the surf~ce of the thin layers of tin (i.e.
- 2 -- .
,: -: .- , , ~
~.~33755 of less than 1 }I thickness) deposited on a hard sur-face.
In order to obtain a dull coating of chromium according to the invention, the already known electrochemical techniques are used, which techniques involve either the use of a cold bath or the u~e of a current cut during the deposit operation. It has however been found that it t~as possible to obtain the dull chromium deposit directly when using for the baths a temperature below normal (25-35C) and without any current cut, whenever the chromium coating is applied to a chromium or tin surface.
The following examples are ~iven non-restrictlvelv to illustrate the invention.
A stainle3s steel plate of 35/100 thicknes~
with a shiny 3urface i used. Said plate is anode ~coured, rinced and then immersed in a conventional chromium bath (250 g/l of chromicanhydride and 2.5 g of sulfuric acid per litre, temperature : 280).
The plate is connected to the cathode; the current A dcm2) is switched on 15 minutes after the immer3ion of th~ plate and it is kept on until the chromium deposit has reached a thickness of 0.3 ~, the current being cut 15 seconds after the beginning of the chromium depositing operation.
A plate with a dull finish i9 obtain~d.
Said plate is covered with a commercial photosensitive printing layer (PCAS~ of approximately 1.8 ~ thickness~
,: -: .- , , ~
~.~33755 of less than 1 }I thickness) deposited on a hard sur-face.
In order to obtain a dull coating of chromium according to the invention, the already known electrochemical techniques are used, which techniques involve either the use of a cold bath or the u~e of a current cut during the deposit operation. It has however been found that it t~as possible to obtain the dull chromium deposit directly when using for the baths a temperature below normal (25-35C) and without any current cut, whenever the chromium coating is applied to a chromium or tin surface.
The following examples are ~iven non-restrictlvelv to illustrate the invention.
A stainle3s steel plate of 35/100 thicknes~
with a shiny 3urface i used. Said plate is anode ~coured, rinced and then immersed in a conventional chromium bath (250 g/l of chromicanhydride and 2.5 g of sulfuric acid per litre, temperature : 280).
The plate is connected to the cathode; the current A dcm2) is switched on 15 minutes after the immer3ion of th~ plate and it is kept on until the chromium deposit has reached a thickness of 0.3 ~, the current being cut 15 seconds after the beginning of the chromium depositing operation.
A plate with a dull finish i9 obtain~d.
Said plate is covered with a commercial photosensitive printing layer (PCAS~ of approximately 1.8 ~ thickness~
3 After drying (3 mins. at 450C and 5 mins. at 850C) the plate is ready~
The plate i~ thereafter uied in the converltional manner in offsQt printing processes :
insolation, removal of soluble parts, sizing, etc Then the plate is used on an of~set printing machine~ It is then noted:
-: .: . ., .
' 1~3375S
- that the printing layer adheres solidly to the dull chromium surface, - that the exposed hydrophilic parts are defi~tely ink-refujing, After a printing run of 60,000 sheets, ~t was noted that the dull chromium had been scratched by a hard object contained in the paper, said scratch exposing the stainless steel but the printing had not been affected by it.
An offset quality steel plate produced by the company USINOR i9 used, of 35/100 thickness.
After scouring, rinsing and an etchin~
rinse, a layer of o~6 ~ thick of hard and shiny chromium is applied on both side~ of the plate in a - bath composed of:
- 250 gr/l of chromic anhydride - 2 ~/1 of sulfuric acid - Temperature : 450C
- Density : -15Adcm2.
The plate is thus coated on both its faces uith a smooth, hard and shiny layer of chromium ; which will protect adequately the plate during manipulation~.
Said plate is then immersed in an electro-lytic bath of chromium of ~imilar composition to that described above, but the operational temperature is 280C and a layer of 0.4 ~ thickneqs of chromium i~
deposited, under 30 per dcm2, on only one of the faces of the plate.
There is thus obtained a plate which is protected over all its faces by a smooth layer of chromium, and which is coated on one face with a layer of dull chromium for use in off4et printin~. Then a photosensitive printing layer is deposited on the dull surface and a ready-to-use off~et plate is obtained.
,
The plate i~ thereafter uied in the converltional manner in offsQt printing processes :
insolation, removal of soluble parts, sizing, etc Then the plate is used on an of~set printing machine~ It is then noted:
-: .: . ., .
' 1~3375S
- that the printing layer adheres solidly to the dull chromium surface, - that the exposed hydrophilic parts are defi~tely ink-refujing, After a printing run of 60,000 sheets, ~t was noted that the dull chromium had been scratched by a hard object contained in the paper, said scratch exposing the stainless steel but the printing had not been affected by it.
An offset quality steel plate produced by the company USINOR i9 used, of 35/100 thickness.
After scouring, rinsing and an etchin~
rinse, a layer of o~6 ~ thick of hard and shiny chromium is applied on both side~ of the plate in a - bath composed of:
- 250 gr/l of chromic anhydride - 2 ~/1 of sulfuric acid - Temperature : 450C
- Density : -15Adcm2.
The plate is thus coated on both its faces uith a smooth, hard and shiny layer of chromium ; which will protect adequately the plate during manipulation~.
Said plate is then immersed in an electro-lytic bath of chromium of ~imilar composition to that described above, but the operational temperature is 280C and a layer of 0.4 ~ thickneqs of chromium i~
deposited, under 30 per dcm2, on only one of the faces of the plate.
There is thus obtained a plate which is protected over all its faces by a smooth layer of chromium, and which is coated on one face with a layer of dull chromium for use in off4et printin~. Then a photosensitive printing layer is deposited on the dull surface and a ready-to-use off~et plate is obtained.
,
- 4 -~33755 -A chromium plated plate sold by the com-pany SOLLAC is used as starting plate.
After hot scouring t650c) in a sodium bicarbonate bath (100 g/l), the plate being made a cathode, said plate is introduced in a chromium bath with a view to depositing on one of ita faces, a thin layer (0.3 ~ for example) of dull chromium.
Similar tests have been conducted u~ing as starting material:
- a steel plate (35/100 thick) produced by the company USINOR, on which has besn applied beforehand a layer of 0.9 ~ of tin nickel alloy, - a plate of gal~anized steel (thickness 35/100, reference El, sold by the Société de Fer Blanc)~
with 2u8 S of tin per m2 over each one of its faces, - a steel plate of 35/~00 whose surface haq been sanded;
it is possible on such a plate to apply the dull chro-mium coating according to the invention (of less than 1 ~ thickness) without using a current cut during the electrolysis ~ . -- a steel plate (35/100 thickne~s) produced by the company USINOR on both sides of which has been coated a chromium, o.6 ju thick of the micro-cracked typs supplied by Etablissements WALBER~, reference W~S.A.
2300 and workin~ at 420. This type of chromium i3 very resistant to corrosion~
- a steel plate (35/100 thickne 8) produced by the company USINOR on both sides of which has been applied a crack-free chromium layer o-f o.6 ,u thickness supplied by Etablissements WALB~RG~ refersnce W~S~Ao 2650 and working at 650. This type of chromium is very resistant to corrosion~
All the plates prepared this wa~ ha~e proved to be very good offset plates, capable, without any baking of the photohardened layer~ of reaching an _ 5 ~3;~755 output of over 40,000 impre~ion~.
. , -- 6 ---.
: ' .:
After hot scouring t650c) in a sodium bicarbonate bath (100 g/l), the plate being made a cathode, said plate is introduced in a chromium bath with a view to depositing on one of ita faces, a thin layer (0.3 ~ for example) of dull chromium.
Similar tests have been conducted u~ing as starting material:
- a steel plate (35/100 thick) produced by the company USINOR, on which has besn applied beforehand a layer of 0.9 ~ of tin nickel alloy, - a plate of gal~anized steel (thickness 35/100, reference El, sold by the Société de Fer Blanc)~
with 2u8 S of tin per m2 over each one of its faces, - a steel plate of 35/~00 whose surface haq been sanded;
it is possible on such a plate to apply the dull chro-mium coating according to the invention (of less than 1 ~ thickness) without using a current cut during the electrolysis ~ . -- a steel plate (35/100 thickne~s) produced by the company USINOR on both sides of which has been coated a chromium, o.6 ju thick of the micro-cracked typs supplied by Etablissements WALBER~, reference W~S.A.
2300 and workin~ at 420. This type of chromium i3 very resistant to corrosion~
- a steel plate (35/100 thickne 8) produced by the company USINOR on both sides of which has been applied a crack-free chromium layer o-f o.6 ,u thickness supplied by Etablissements WALB~RG~ refersnce W~S~Ao 2650 and working at 650. This type of chromium is very resistant to corrosion~
All the plates prepared this wa~ ha~e proved to be very good offset plates, capable, without any baking of the photohardened layer~ of reaching an _ 5 ~3;~755 output of over 40,000 impre~ion~.
. , -- 6 ---.
: ' .:
Claims (4)
1. An offset printing plate comprising a shiny hydrophilic surface known per se as suitable for use as the hydrophilic surface of an offset plate, said surface being at least partly coated with a dull and porous layer of chromium, said layer having a thickness less than about 1µ.
2. A plate according to claim 1 wherein the thickness of the dull and porous layer of chromium is less than about 0.5µ.
3. A plate according to claim 1, wherein said shiny hydrophilic surface is of stainless steel, nickel-tin, chromium, chromium-chromium oxide, phosphorus nickel, tin alloys, or nickel alloys.
4. A plate according to claim 1 wherein the said shiny hydrophilic surface is a zinc or tin surface, the thick-ness of the zinc or tin layer being less than approximately 1µ, and the said layer being deposited over a hard surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7917153 | 1979-07-02 | ||
| FR7917153A FR2460211A1 (en) | 1979-07-02 | 1979-07-02 | NEW OFFSET PLATE WITH SURFACE MATT CHROMED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1133755A true CA1133755A (en) | 1982-10-19 |
Family
ID=9227397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA354,878A Expired CA1133755A (en) | 1979-07-02 | 1980-06-26 | Offset plates with a hydrophilic surface given a dull finish by way of a thin chromium 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) | ES492985A0 (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 BR BR8004111A patent/BR8004111A/en not_active IP Right Cessation
- 1980-06-30 DE DE8080400982T patent/DE3069101D1/en not_active Expired
- 1980-07-01 ES ES492985A patent/ES492985A0/en active Granted
- 1980-07-01 JP JP8858780A patent/JPS5637192A/en active Granted
- 1980-07-01 MX MX18298980A patent/MX156999A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES8200273A1 (en) | 1981-10-16 |
| JPH0322314B2 (en) | 1991-03-26 |
| FR2460211A1 (en) | 1981-01-23 |
| FR2460211B1 (en) | 1984-07-06 |
| JPS5637192A (en) | 1981-04-10 |
| MX156999A (en) | 1988-10-19 |
| EP0022033B1 (en) | 1984-09-05 |
| ES492985A0 (en) | 1981-10-16 |
| DE3069101D1 (en) | 1984-10-11 |
| BR8004111A (en) | 1981-01-21 |
| EP0022033A1 (en) | 1981-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4371430A (en) | Electrodeposition of chromium on metal base lithographic sheet | |
| DE3150278C2 (en) | Process for the production of a steel substrate for planographic printing plates | |
| US3834998A (en) | Method of producing aluminum planographic printing plates | |
| US4448647A (en) | Electrochemically treated metal plates | |
| US5486283A (en) | Method for anodizing aluminum and product produced | |
| CA1133755A (en) | Offset plates with a hydrophilic surface given a dull finish by way of a thin chromium layer | |
| CA1057111A (en) | Steel lithoplate structure and method of manufacture | |
| US3280736A (en) | Multi-metal planographic printing plates | |
| JPH0154436B2 (en) | ||
| EP1002644B1 (en) | Production of support for lithographic printing plate. | |
| US3616285A (en) | Repair of chromium plated surfaces | |
| US4287288A (en) | Lithographic plate of tin-plated steel and method of manufacture | |
| JPH03177528A (en) | Aluminum alloy sheet stock for supporting body of printing form plate | |
| US3478684A (en) | Planographic printing plates | |
| US4547274A (en) | Support for lithographic printing plate and lithographic printing plate | |
| EP0036316B1 (en) | Lithographic printing plate | |
| US4857436A (en) | Offset plates with two chromium layers | |
| US3940321A (en) | Methods of treating aluminium | |
| US4996131A (en) | Offset plate with thin chromium layer and method of making | |
| EP0096347B1 (en) | Aluminium alloy, a support of lithographic printing plate and a lithographic printing plate using the same | |
| US3577920A (en) | Metallic lithographic plate and method of making the same | |
| JPH05139067A (en) | Offset printing plate support material in form of sheet, foil or web and its production method and its use | |
| US3502548A (en) | Method of electroplating gold on chromium | |
| US4585529A (en) | Method for producing a metal lithographic plate | |
| JPS6255517B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |