CA1132840A - Offset plate for use as a monometallic plate comprising a printing layer, and off-set printing process using the said plate - Google Patents
Offset plate for use as a monometallic plate comprising a printing layer, and off-set printing process using the said plateInfo
- Publication number
- CA1132840A CA1132840A CA341,660A CA341660A CA1132840A CA 1132840 A CA1132840 A CA 1132840A CA 341660 A CA341660 A CA 341660A CA 1132840 A CA1132840 A CA 1132840A
- Authority
- CA
- Canada
- Prior art keywords
- plate
- water
- accepting
- printing layer
- layer
- 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
-
- 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
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
PATENT APPLICATION
Entitled: New offset plate for use as a monometallic plate comprising a printing layer, and offset printing process using the said plate.
in the name of: Jean-Marie NOUEL
ABSTRACT OF THE DISCLOSURE
The present invention relates to a new offset plate for use as a monometallic plate compris-ing a printing layer and wherein between the surface of the plate accepting water and the printing layer is inserted a film, whose thickness may vary between 0.005 and 0.5µ of a material accepting ink.
Entitled: New offset plate for use as a monometallic plate comprising a printing layer, and offset printing process using the said plate.
in the name of: Jean-Marie NOUEL
ABSTRACT OF THE DISCLOSURE
The present invention relates to a new offset plate for use as a monometallic plate compris-ing a printing layer and wherein between the surface of the plate accepting water and the printing layer is inserted a film, whose thickness may vary between 0.005 and 0.5µ of a material accepting ink.
Description
11328~0 The present invention relates to a new offset plate~ for use as a monometallic plate~ and comprising a printing layerO
In offset printing, plates are often u~ed which are known to be used as monometallic plates, i.
e. plate~ in which a monometallic surface, the term monometallic being used here to cover simultaneously the use of metals or alloys, plays the part of surface accepting water~ Such a surface may be for example in stainless steel, chromium, tin, nickel-tin, aluminium, aluminium alloy or hydrophilous ~inc. Such surface is the surface of a support which is made of the same metal or alloy or of a different metal;
plates are known to have, for example, a coppered steel support and a chromium surface.
A positive or negative photosensitive printing layer is deposited on the said monometallic surface.
The development, after insolating, consists in removing the soluble parts of the printing layer and in exposing the subjacent water accepting mono-metallic surface.
It has been found, and this is precisely the object of the present invention, that in offset plates used as plates having monometallic water-accepting surfaces, such as those described herein-above, it is advantageous to insert between the water-acceptinS surface and the printing surface a film of between 0.005 and 0.5 ~ thickness of a 3 water-refusing derivative.
Such water-refusing derivative can be a metal, a metal alloy, a varnish, a resin or a combina-tion of these products~
Said derivative will need to be strongly fixed by known means, to the water-accepting surface used, and also to be easily removable, after the printing layer is developed~ by means of an etching solution which will remove the totality of the derivative without noticeably attacking either the remaining parts of the printing layer or the water-accepting monometallic surface on which the derivative has been deposited.
According to the invention, it i9 possible and even preferred to use a metal or metal alloy accepting ink or made to accept ink after an appropriate treatment. Amongst metals and metal alloys suitable to be very thinly applied over a monometallic water-accepting surface can be cited:
- copper, bronze, lead, ink-accepting zinc, zinc-nickel, tin, iron~antimony, cadmium, manganese, ink-accepting chromium, or various alloys of these metals,the said metals or metal alloy~ accepting ink nat-urally or being made to accept ink.
It may often be advantageous to arrange, within the scope of the invention, for the film of water-refusing derivative deposited between the water-accepting surface and the printing layer, to be colored and to have a special structure. ~or example, when the said film is constituted by a deposit of copper, tin or zinc, etc... it is advantageous, before depositing the printing layer, to attack the metallic film with commercially known substances in order to produce porous surfaces which may be blackened or colored as required~
The way to produce the film should be 3 selected as a function, fir~t of the metal or alloy to be deposited, and second, of the water-accepting monometallic surface to be covered; amongst the known methods of depositing such a film, the main ones are: chemical displacement of a metal contained in a bath, or electrolysi~. When the said film is to be made of a material such as varnish or a resin, ,:
~:13Z840 known techniques will then be used.
The non-restrictive examples given herein-after illustrate the invention.
EXA~IPLE 1 S An aluminium plate of 25/100 thickness is used, whose face has been scoured and scrubbed but not anodized. On the surface of the said plate is deposited a film of zinc of 0002 p thickness using the "zincate process" which consists in dipping the aluminium plate for about 30 seconds in a bath especially containing zinc salts~ Such a process is for example described in the CANNING HANDBOOK
ON ELECTROPLATING (22nd Edition) Canning Lt. Page 350.
On the zinc film produced this way, is deposited a photosensitive layer of about 1 to 2 ~, such as for example a negative photosensitive layer.
After insolation, the said photosensitive layer is treated with a developing solution which dissolves the non-hardened parts of the layer; then the whole lot is treated with a nitric acid solution at 15% which removes the zinc film in those places where the zinc surface is no longer covered with a printing layer. After washing, a plate is obtained which can be used right away and in which the aluminium surface plays the part of water-accepting surface.
A scrubbed stainless steel plate is used.
Said plate i~ soaked in an acid copper plating bath by electrolysis, and the said electrolysis is conducted until a copper deposit of about 0.2 ~ is obtained.
On the said copper surface is deposited a negative photosensitive layer of about 1.5 ~ thickness.
After insolation, the photosensitive layer is treated with a developins solution and then those il3~8~0 parts of -the copper film, which have been exposed with a nitric acid solution (copper etching) so as to expose the corresponding subjacent parts of stainless steel, are removed.
After scouring down an aluminium plate - (offset quality) produced by the company CEGEDUR, its surface is scrubbed with water and a fine pumice, and then rinsed. The plate is thereafter treated first in a bath containing phosphoric acid so as to oxide its surface anodically~ After rinsing, the plate is immersed in a copper plating bath containing pyrophosphate and composed as follows:
Cu2P207 71 g/l K4P207 302 g/l K N03 11O5g/1 NH40H 5 ml/l the pH of the bath being 8.5, the voltage density lA/dm2 and the temperature 55C. The plate is removed from the bath when a layer of o.8 ~ of copper has deposited.
After rinsing and drying, the surface of the copper is coated with a printing photosensitive layer known of every one skilled in the art.
After scouring and scrubbing an aluminium plate of 25/100 thickness produced by the company CEGEDUR (offset quality), a solution containing 1000 cc of isopropyl alcohol (99%), 31 g of Cu2C12 (copper chloride) and 32 cc of llcl (37. 3805), is spread over the completely dry surface of the plate.
The aluminium reddens thereb~ indicating the formation of a copper layer. When the coloring is uniform, the excess solution is removed with a seraper, and the isopropyl alcohol is poured on and quiekly removed with eellulose wool for drying the surfaee. Said surface is then eoated with a photosensitive layer as indieated hereinabove.
After insolation, the non-hardened portions are removed with a developed solution and then with a special etehing solution to destroy the copper on aluminium (Polyehrome bi-metal etehing) the copper may be removed in less than 30 seconds in the developed areasO After rinsing and gumming the plate is ready to be used in a machineO
A stainless steel plate is used which is covered, as in example 2, with copper, the thickness f the copper deposit being 0 7~u After rinsing, the said plate is soaked in a bath of a product sold by the Company IMASA, under the name Ebonol C~ for blackening copper ~ surfaces.
The copper becomes black, dull and porous and its thickness is brought back to about Ool ~o The plate is then coated with a positive and photosensitive printing layer~ of 1. 8 ~ thiclmess after insolation and developingO
The black copper is destroyed with an etching solution as in Example 2.
The printing parts are very dark and contrast strongly with the water-accepting surface, this facilitating greatly the control.
... ...
A USINOR steel plate is used and coated with a 3 ~ layer of tin nickel (65-35), then with a oOo8 ~ layer of co~er or tin and with a o.o8 p ~ nl~c m~k) layer of an ALVONOL~resin (formophenolic resin commercialized by the company l10ECHST).
11328~t~
Aft~r drying, the coated plate i~ baked at 220 for a ~ew second~ to harden the ~aid resin.
After which the plate surface is coated witll a 1,8 photosensitive printinS layer.
After insolation and developing, the plate is attacked with a solution known and used in off~et techniques for etching copper or tin; the ~aid qolution is sufficient to remove first the thin layer of ALVONOL resin, and second~ the film of copper or tin. The water-accepting surface i~ thus exposed~
The pIates according to the invention have very interesting qualities which are linked to the two following phenomena:
- on the one hand, the printing layer shows very good adherence to the surface of the film of ink-accepting metal alloy or resin produced this way, - and on the other hand, the water-accepting layer exposed at the end of the process i~ always found to be clean, iOeO not accepting ink~
In offset printing, plates are often u~ed which are known to be used as monometallic plates, i.
e. plate~ in which a monometallic surface, the term monometallic being used here to cover simultaneously the use of metals or alloys, plays the part of surface accepting water~ Such a surface may be for example in stainless steel, chromium, tin, nickel-tin, aluminium, aluminium alloy or hydrophilous ~inc. Such surface is the surface of a support which is made of the same metal or alloy or of a different metal;
plates are known to have, for example, a coppered steel support and a chromium surface.
A positive or negative photosensitive printing layer is deposited on the said monometallic surface.
The development, after insolating, consists in removing the soluble parts of the printing layer and in exposing the subjacent water accepting mono-metallic surface.
It has been found, and this is precisely the object of the present invention, that in offset plates used as plates having monometallic water-accepting surfaces, such as those described herein-above, it is advantageous to insert between the water-acceptinS surface and the printing surface a film of between 0.005 and 0.5 ~ thickness of a 3 water-refusing derivative.
Such water-refusing derivative can be a metal, a metal alloy, a varnish, a resin or a combina-tion of these products~
Said derivative will need to be strongly fixed by known means, to the water-accepting surface used, and also to be easily removable, after the printing layer is developed~ by means of an etching solution which will remove the totality of the derivative without noticeably attacking either the remaining parts of the printing layer or the water-accepting monometallic surface on which the derivative has been deposited.
According to the invention, it i9 possible and even preferred to use a metal or metal alloy accepting ink or made to accept ink after an appropriate treatment. Amongst metals and metal alloys suitable to be very thinly applied over a monometallic water-accepting surface can be cited:
- copper, bronze, lead, ink-accepting zinc, zinc-nickel, tin, iron~antimony, cadmium, manganese, ink-accepting chromium, or various alloys of these metals,the said metals or metal alloy~ accepting ink nat-urally or being made to accept ink.
It may often be advantageous to arrange, within the scope of the invention, for the film of water-refusing derivative deposited between the water-accepting surface and the printing layer, to be colored and to have a special structure. ~or example, when the said film is constituted by a deposit of copper, tin or zinc, etc... it is advantageous, before depositing the printing layer, to attack the metallic film with commercially known substances in order to produce porous surfaces which may be blackened or colored as required~
The way to produce the film should be 3 selected as a function, fir~t of the metal or alloy to be deposited, and second, of the water-accepting monometallic surface to be covered; amongst the known methods of depositing such a film, the main ones are: chemical displacement of a metal contained in a bath, or electrolysi~. When the said film is to be made of a material such as varnish or a resin, ,:
~:13Z840 known techniques will then be used.
The non-restrictive examples given herein-after illustrate the invention.
EXA~IPLE 1 S An aluminium plate of 25/100 thickness is used, whose face has been scoured and scrubbed but not anodized. On the surface of the said plate is deposited a film of zinc of 0002 p thickness using the "zincate process" which consists in dipping the aluminium plate for about 30 seconds in a bath especially containing zinc salts~ Such a process is for example described in the CANNING HANDBOOK
ON ELECTROPLATING (22nd Edition) Canning Lt. Page 350.
On the zinc film produced this way, is deposited a photosensitive layer of about 1 to 2 ~, such as for example a negative photosensitive layer.
After insolation, the said photosensitive layer is treated with a developing solution which dissolves the non-hardened parts of the layer; then the whole lot is treated with a nitric acid solution at 15% which removes the zinc film in those places where the zinc surface is no longer covered with a printing layer. After washing, a plate is obtained which can be used right away and in which the aluminium surface plays the part of water-accepting surface.
A scrubbed stainless steel plate is used.
Said plate i~ soaked in an acid copper plating bath by electrolysis, and the said electrolysis is conducted until a copper deposit of about 0.2 ~ is obtained.
On the said copper surface is deposited a negative photosensitive layer of about 1.5 ~ thickness.
After insolation, the photosensitive layer is treated with a developins solution and then those il3~8~0 parts of -the copper film, which have been exposed with a nitric acid solution (copper etching) so as to expose the corresponding subjacent parts of stainless steel, are removed.
After scouring down an aluminium plate - (offset quality) produced by the company CEGEDUR, its surface is scrubbed with water and a fine pumice, and then rinsed. The plate is thereafter treated first in a bath containing phosphoric acid so as to oxide its surface anodically~ After rinsing, the plate is immersed in a copper plating bath containing pyrophosphate and composed as follows:
Cu2P207 71 g/l K4P207 302 g/l K N03 11O5g/1 NH40H 5 ml/l the pH of the bath being 8.5, the voltage density lA/dm2 and the temperature 55C. The plate is removed from the bath when a layer of o.8 ~ of copper has deposited.
After rinsing and drying, the surface of the copper is coated with a printing photosensitive layer known of every one skilled in the art.
After scouring and scrubbing an aluminium plate of 25/100 thickness produced by the company CEGEDUR (offset quality), a solution containing 1000 cc of isopropyl alcohol (99%), 31 g of Cu2C12 (copper chloride) and 32 cc of llcl (37. 3805), is spread over the completely dry surface of the plate.
The aluminium reddens thereb~ indicating the formation of a copper layer. When the coloring is uniform, the excess solution is removed with a seraper, and the isopropyl alcohol is poured on and quiekly removed with eellulose wool for drying the surfaee. Said surface is then eoated with a photosensitive layer as indieated hereinabove.
After insolation, the non-hardened portions are removed with a developed solution and then with a special etehing solution to destroy the copper on aluminium (Polyehrome bi-metal etehing) the copper may be removed in less than 30 seconds in the developed areasO After rinsing and gumming the plate is ready to be used in a machineO
A stainless steel plate is used which is covered, as in example 2, with copper, the thickness f the copper deposit being 0 7~u After rinsing, the said plate is soaked in a bath of a product sold by the Company IMASA, under the name Ebonol C~ for blackening copper ~ surfaces.
The copper becomes black, dull and porous and its thickness is brought back to about Ool ~o The plate is then coated with a positive and photosensitive printing layer~ of 1. 8 ~ thiclmess after insolation and developingO
The black copper is destroyed with an etching solution as in Example 2.
The printing parts are very dark and contrast strongly with the water-accepting surface, this facilitating greatly the control.
... ...
A USINOR steel plate is used and coated with a 3 ~ layer of tin nickel (65-35), then with a oOo8 ~ layer of co~er or tin and with a o.o8 p ~ nl~c m~k) layer of an ALVONOL~resin (formophenolic resin commercialized by the company l10ECHST).
11328~t~
Aft~r drying, the coated plate i~ baked at 220 for a ~ew second~ to harden the ~aid resin.
After which the plate surface is coated witll a 1,8 photosensitive printinS layer.
After insolation and developing, the plate is attacked with a solution known and used in off~et techniques for etching copper or tin; the ~aid qolution is sufficient to remove first the thin layer of ALVONOL resin, and second~ the film of copper or tin. The water-accepting surface i~ thus exposed~
The pIates according to the invention have very interesting qualities which are linked to the two following phenomena:
- on the one hand, the printing layer shows very good adherence to the surface of the film of ink-accepting metal alloy or resin produced this way, - and on the other hand, the water-accepting layer exposed at the end of the process i~ always found to be clean, iOeO not accepting ink~
Claims (6)
1. A new offset plate for use as a mono-metallic plate comprising a printing layer, wherein between the water-accepting surface of the plate and the printing layer is inserted a film, of water-refusing material, whose thickness may vary between 0.005 and 0.5µ.
2. A new plate as claimed in claim 1, wherein the said water-refusing material is selected from metals or metallic alloys that are ink-accepting or can be made so.
3. A new plate as claimed in claim 1, wherein the said film of water-refusing material is treated, before being covered with the printing layer, according to a known method, in order that its surface becomes porous and/or is blackened or reddened.
4. A new plate as claimed in any one of claims 1 to 3, wherein the said film of water-refusing material is coated with a thin layer of ink-accepting resin, before receiving the printing layer.
5. A new plate as claimed in any one of claims 1 to 3, wherein the water-accepting surface is a metallic surface selected from steel, stainless steel, chromium, tin, tin-nickel, aluminium or water-accepting zinc surfaces.
6. Offset printing process using a new offset plate such as claimed in any one of claims 1 to 3, wherein, after insolating the printing layer and removing the soluble parts of the said layer, said film of said ink-accepting material, then exposed, is removed, for example, with an etching solution.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7834955A FR2443935A1 (en) | 1978-12-12 | 1978-12-12 | Offset printing plate with intermediate non-hydrophilic layer - between metal surface and printing layer |
| FR7834955 | 1978-12-12 | ||
| FR7917152A FR2460210B2 (en) | 1979-07-02 | 1979-07-02 | IMPROVED PROCESS FOR THE PREPARATION OF OFFSET PLATES AND PLATES OBTAINED |
| FR7917152 | 1979-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1132840A true CA1132840A (en) | 1982-10-05 |
Family
ID=26220907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA341,660A Expired CA1132840A (en) | 1978-12-12 | 1979-12-11 | Offset plate for use as a monometallic plate comprising a printing layer, and off-set printing process using the said plate |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0012673A1 (en) |
| BR (1) | BR7908088A (en) |
| CA (1) | CA1132840A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9711381D0 (en) * | 1997-06-03 | 1997-07-30 | Du Pont Uk | Heat sensitive printing plate precursors |
| GB9711391D0 (en) * | 1997-06-03 | 1997-07-30 | Du Pont Uk | Heat sensitive printing plate precursors |
| GB9711383D0 (en) * | 1997-06-03 | 1997-07-30 | Du Pont Uk | Heat sensitive printing plateprecursors |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL77123C (en) * | 1900-01-01 | |||
| DE556711C (en) * | 1930-03-05 | 1932-08-13 | Johannes May | Metal pressure plate with a cadmium coating |
| FR1253949A (en) * | 1960-01-07 | 1961-02-17 | Nobel Bozel | Polymetallic plates for offset printing |
| DE1571903A1 (en) * | 1965-12-22 | 1970-12-17 | Krause Willy | Process for the production of multilayer offset printing plates |
| FR2069924A1 (en) * | 1969-12-05 | 1971-09-10 | Hasek Josef | Photolithographic plate - with reactive anticorrosion layer |
| FR2232195A5 (en) * | 1973-05-30 | 1974-12-27 | Schafler Armando | Planographic printing plate for use with negative transparency - having long life, capable of accurate dot structure that produces high fidelity printing with good reprodn |
-
1979
- 1979-12-06 EP EP79400974A patent/EP0012673A1/en not_active Withdrawn
- 1979-12-11 CA CA341,660A patent/CA1132840A/en not_active Expired
- 1979-12-11 BR BR7908088A patent/BR7908088A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR7908088A (en) | 1980-07-22 |
| EP0012673A1 (en) | 1980-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |