NO158224B - PROCEDURE FOR ANODIZING ALUMINUM SUBSTRATE FOR LITOGRAPHIC PRINT PLATE. - Google Patents
PROCEDURE FOR ANODIZING ALUMINUM SUBSTRATE FOR LITOGRAPHIC PRINT PLATE. Download PDFInfo
- Publication number
- NO158224B NO158224B NO820428A NO820428A NO158224B NO 158224 B NO158224 B NO 158224B NO 820428 A NO820428 A NO 820428A NO 820428 A NO820428 A NO 820428A NO 158224 B NO158224 B NO 158224B
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- NO
- Norway
- Prior art keywords
- phosphoric acid
- electrolyte
- sulfuric acid
- anodized
- litographic
- Prior art date
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 13
- 229910052782 aluminium Inorganic materials 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 9
- 238000007743 anodising Methods 0.000 title claims description 7
- 239000000758 substrate Substances 0.000 title claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 36
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 32
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 18
- 239000003792 electrolyte Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 10
- 238000002048 anodisation reaction Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000011282 treatment Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 229940093475 2-ethoxyethanol Drugs 0.000 description 1
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 quinone diazide ester Chemical class 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- NHQVTOYJPBRYNG-UHFFFAOYSA-M sodium;2,4,7-tri(propan-2-yl)naphthalene-1-sulfonate Chemical compound [Na+].CC(C)C1=CC(C(C)C)=C(S([O-])(=O)=O)C2=CC(C(C)C)=CC=C21 NHQVTOYJPBRYNG-UHFFFAOYSA-M 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
Foreliggende oppfinnelse vedrører anodisering av aluminium The present invention relates to the anodization of aluminium
og legeringer derav, spesielt for bruk som substrater for litografiske trykkeplater. som angitt i krav l's ingress. and alloys thereof, especially for use as substrates for lithographic printing plates. as stated in claim l's preamble.
Aluminium og aluminiumslegeringer er det mest brukte mate-rialet som substrater for litografiske plater p.g.a. at de er relativt billige, formbare, dimensjonsstabile og overflaten har den evne at den kan gis forbedrede litografiske egenskaper. Således er det vanlig å korne overflaten for å øke dens vannbærende evne og forbedre heftet til det bestrålingssensitive bélegg som brukes for å danne bildet og å anodisere overflaten for å øke dets slitestyrke og hydrofile karakter. De mest vanlig brukte elektrolytter for anodi-seringsprosessen er fosforsyre og svovelsyre. Aluminum and aluminum alloys are the most commonly used material as substrates for lithographic plates due to that they are relatively cheap, malleable, dimensionally stable and the surface has the ability to be given improved lithographic properties. Thus, it is common to grain the surface to increase its water-bearing capacity and improve adhesion to the radiation-sensitive coating used to form the image and to anodize the surface to increase its wear resistance and hydrophilic character. The most commonly used electrolytes for the anodizing process are phosphoric acid and sulfuric acid.
Bruken av fosforsyre som anodiserende elektrolytt gir et anodisk sjikt som har en maksimal tykkelse på bare 1 jum, p.g.a. at sjiktet oppløses i elektrolytten. Derfor er slitestyrken relativt lav. The use of phosphoric acid as an anodising electrolyte gives an anodic layer which has a maximum thickness of only 1 µm, due to that the layer dissolves in the electrolyte. Therefore, the wear resistance is relatively low.
Det anodiske sjikt som dannes ved å bruke svovelsyre som elektrolytt er tykkere og har derfor bedre slitestyrke, men har tendens til å farges og har utilstrekkelig adhesjon til enkelte typer av lyssensitive belegg. Selv om adhesjonen kan økes i noen få tilfeller ved spesielle kjemiske etterano-diserongsbehandlinger må både de anodiske behandlinger og den kjemiske behandling kontrolleres omhyggelig slik at en balanse vedvarende opprettholdes mellom billedadhesjonen og den letthet hvormed ikke-billedflater fremkalles. The anodic layer formed by using sulfuric acid as an electrolyte is thicker and therefore has better wear resistance, but tends to color and has insufficient adhesion to certain types of light-sensitive coatings. Although adhesion can be increased in a few cases by special post-anodiserong chemical treatments, both the anodic treatments and the chemical treatment must be carefully controlled so that a balance is consistently maintained between image adhesion and the ease with which non-image surfaces are developed.
Fremstillingen av forbedrede aluminium eller aluminium-legeringsubstrater for litografiske trykkeplater har vært påtenkt i mange år, og av denne grunn er mange forskjellige typer elektrolytisk behandling og mange forskjellige typer elektrolytter basert på svovelsyre, fosforsyre og andre ledende væsker blitt forsøkt. Overraskende har man nå funnet at anodiske sjikt som er utmerket egnet for litografiske trykkeplater lett kan fremstilles bare ved først å anodisere aluminium eller legering derav i fosforsyreelektrolytt og så anodisere aluminium eller legering derav i en elektrolytt bestående av en blanding inneholdende en hovedmengde fosforsyre og en mindre mengde svovelsyre, på en slik måte som er beskrevet i krav l's karakteriserende del. The production of improved aluminum or aluminum alloy substrates for lithographic printing plates has been contemplated for many years, and for this reason many different types of electrolytic treatment and many different types of electrolytes based on sulfuric acid, phosphoric acid and other conductive liquids have been attempted. Surprisingly, it has now been found that anodic layers which are excellently suitable for lithographic printing plates can be easily produced simply by first anodizing aluminum or its alloy in phosphoric acid electrolyte and then anodizing aluminum or its alloy in an electrolyte consisting of a mixture containing a major amount of phosphoric acid and a minor amount of sulfuric acid, in such a way as is described in the characterizing part of claim 1.
Ifølge en utførelsesform utføres den første anodiseringen i 0,25 til 4 minutter idet man som elektrolytt anvender en vandig løsning som inneholder 250 til 380 g pr. liter (fortrinnsvis 328 til 380 g pr. liter) fosforsyre ved en spenning på 15 til 35 V og en temperatur på 15 til 46°C og den andre anodiseringen utføres fra 0,25 til 4,0' minutter ved å bruke som elektrolytt en vandig løsning som inneholder 2 0 til 150 g pr. liter (fortrinnsvis 40 til 100 g pr. literX svovelsyre og 250 til 380 g pr. liter fosforsyre med en spenning på 15 til 35 V og en temperatur på 15 til 46°C. According to one embodiment, the first anodization is carried out for 0.25 to 4 minutes, using as electrolyte an aqueous solution containing 250 to 380 g per liters (preferably 328 to 380 g per liter) of phosphoric acid at a voltage of 15 to 35 V and a temperature of 15 to 46°C and the second anodization is carried out from 0.25 to 4.0' minutes using as electrolyte a aqueous solution containing 20 to 150 g per liter (preferably 40 to 100 g per liter X sulfuric acid and 250 to 380 g per liter phosphoric acid with a voltage of 15 to 35 V and a temperature of 15 to 46°C.
Ifølge et ytterligere foretrukket trekk er spenningen som brukes i det andre anodiseringstrinnet lik,eller større enn den spenning som brukes i det første trinnet. Med mindre spenningene er anordnet på denne måte er det en forsinkelse mens barrieresjikttynning finner sted før strøm kan passere i det andre anodiseringstrinn. According to a further preferred feature, the voltage used in the second anodizing step is equal to or greater than the voltage used in the first step. Unless the voltages are arranged in this way, there is a delay while barrier layer thinning takes place before current can pass in the second anodization step.
De følgende eksempler illustrerer oppfinnelsen. The following examples illustrate the invention.
Eksempel 1 Example 1
Tre ark av elektrokjemisk kornet aluminium ble anodisert ved å bruke likestrøm og henholdsvis bare i fosforsyre (ark 1), bare svovelsyre (ark 21, og først i svovelsyre og deretter i en blanding av fosforsyre og svovelsyre (ark 3) ved bruk av følgende betingelser: - Three sheets of electrochemically grained aluminum were anodized using direct current and respectively only in phosphoric acid (sheet 1), only sulfuric acid (sheet 21, and first in sulfuric acid and then in a mixture of phosphoric acid and sulfuric acid (sheet 3) using the following conditions : -
De anodiserte ark ble overtrukket med en strålingssensitiv blanding bestående av reaksjonsproduktet av p-diazodifenyl-amin/formaldehydkondensat og natrium tri-isopropylnaftalen-sulfonat og Victoria Cyan F5G fargestoff (BASF) hvilket ga bestrålingssensitive plater som deretter ble eksponert for UV lys under et transparent negativ og fremkalt med 20% v/v vandig løsning av isopropanol som inneholder 2% anionisk overflateaktivt middel. Hver av de resulterende litografiske trykkeplater ble så brukt til å trykke kopier. The anodized sheets were coated with a radiation-sensitive mixture consisting of the reaction product of p-diazodiphenyl-amine/formaldehyde condensate and sodium tri-isopropylnaphthalene sulfonate and Victoria Cyan F5G dye (BASF) yielding radiation-sensitive plates which were then exposed to UV light under a transparent negative and developed with a 20% v/v aqueous solution of isopropanol containing 2% anionic surfactant. Each of the resulting lithographic printing plates was then used to print copies.
Arket som var anodisert i fosforsyre ga bare en trykkserie på 60 000 kopier før skumming p.g.a. det anodiske sjikt ble slitt vekk i ikke-billedflåtene. The sheet which was anodized in phosphoric acid only produced a print run of 60,000 copies before foaming due to the anodic layer was worn away in the non-image floats.
Ikke-billedflåtene til arket som var anodisert i svovelsyre ble bare farget etter fremkalling og platen ga en trykkserie på 60 000 kopier før billedflatene ble slitt p.g.a. mangel på adhesjon til det anodiske sjikt. The non-image surfaces of the sheet which had been anodized in sulfuric acid were only colored after development and the plate produced a print run of 60,000 copies before the image surfaces were worn due to lack of adhesion to the anodic layer.
Arket som var anodisert i to trinn ifølge foreliggende oppfinnelse ble utviklet rent uten noen farging og ga en trykkserie på 130 000 kopier. The sheet which was anodized in two steps according to the present invention was developed cleanly without any coloring and produced a print run of 130,000 copies.
Et ytterligere elektrisk kornet ark ble anodisert i bare svovelsyre og så gitt et etteranodisk dypp i natriumsilikat. Det ble ikke funnet noen forbedring verken i graden av farging eller seriens lengde. A further electrically grained sheet was anodised in bare sulfuric acid and then given a post-anodic dip in sodium silicate. No improvement was found either in the degree of staining or the length of the series.
Eksempel 2 Example 2
En aluminiumsduk ble kontinuerlig elektrokornet og deretter anodisert ved å bruke likestrøm først i fosforsyreelektrolytt og deretter i en elektrolytt bestående av en blanding av fosforsyre og svovelsyre. Duken ble så overtrukket med den bestrålingsømfintlige blandingen fra eksempel 1 for å danne en bestrålingsømfintlig plate. An aluminum sheet was continuously electro-grained and then anodized using direct current first in phosphoric acid electrolyte and then in an electrolyte consisting of a mixture of phosphoric acid and sulfuric acid. The cloth was then coated with the radiosensitive composition of Example 1 to form a radiosensitive plate.
Betingelsene som ble brukt for anodiseringen var som følger: The conditions used for the anodization were as follows:
En prøve av duken ble eksponert og fremkalt som i eksempel 1. Den fremkaltes rent og den resulterende litografiske trykke-plate ga et trykkantall på 130 000 kopier. A sample of the cloth was exposed and developed as in Example 1. It was developed cleanly and the resulting lithographic printing plate yielded a print count of 130,000 copies.
Eksempel 3 Example 3
Tre aluminiumsark ble kornet elektrokjemisk og anodisert Three aluminum sheets were electrochemically grained and anodized
som i eksempel 1. as in example 1.
Arkene ble overtrukket med en bestrålingsømfintlig blanding bestående av en epoksyharpiksester av 4-azidc-alf a-cyano-delta-klor-cinnamylideneddiksyre for å danne bestrålings-ømfintlige plater som deretter ble eksponert under et nega-tivt transparent for UV lys og fremkalt med en blanding av 2-etoksyetanol, 2-etoksyetylacetat og et ikke-ionisk overflateaktivt middel. De resulterende litografiske trykkeplater ble så brukt for trykking. The sheets were coated with a radiation-sensitive composition consisting of an epoxy resin ester of 4-azidc-alpha-cyano-delta-chloro-cinnamylideneacetic acid to form radiation-sensitive plates which were then exposed under a negative transparent to UV light and developed with a mixture of 2-ethoxyethanol, 2-ethoxyethyl acetate and a nonionic surfactant. The resulting lithographic printing plates were then used for printing.
Arkene som bare var anodisert i en. syre ga trykkserier på The sheets that were only anodized in one. acid gave pressure series on
60 000 kopier mens arket som var anodisert i to trinn ifølge foreliggende oppfinnelse ga en trykkserie på 120 000 kopier. 60,000 copies, while the sheet which was anodized in two stages according to the present invention produced a print run of 120,000 copies.
Et ytterligere ark av elektrokornet aluminium ble anodisert A further sheet of electro-grained aluminum was anodised
i svovelsyre under de ovennevnte betingelser og deretter gitt en etteranodisk behandling med hydrofluorkiselsyre. En trykkserie på 12 0 000 kopier ble oppnådd, men med mindre den etter-anodiske behandling ble kontrollert utført innen meget snevre grenser, ble det umulig å fjerne ikke-billedflåtene for frem-kalleren. in sulfuric acid under the above conditions and then given a post-anodic treatment with hydrofluorosilicic acid. A print run of 12,0000 copies was achieved, but unless the post-anodic treatment was controlled and carried out within very narrow limits, it became impossible to remove the non-image floats for the developer.
Eksempel 4 Example 4
Tre ytterligere aluminiumsark ble elektrokjemisk kornet og anodisert som i eksempel 1. Three additional aluminum sheets were electrochemically grained and anodized as in Example 1.
Arkene ble overtrukket med en bestrålingsømfintlig blanding bestående av en kinondiazidester, en novolakharpiks og et krystallfiolett fargestoff for å danne bestrålingsømfint-lige plater som ble eksponert for ultrafiolett lys under et positivt transparent og fremkalt en vandig løsning inneholdende natriummetasilikat, natriumfosfat og et ikke-ionisk overflateaktivt middel. Hver av de resulterende litografiske trykkeplater ble så brukt for trykning. The sheets were coated with a radiosensitive mixture consisting of a quinone diazide ester, a novolak resin and a crystal violet dye to form radiosensitive plates which were exposed to ultraviolet light under a positive transparent and developed aqueous solution containing sodium metasilicate, sodium phosphate and a nonionic surfactant medium. Each of the resulting lithographic printing plates was then used for printing.
En trykkeserie på 120 000 kopier erholdtes fra arket som var anodisert i to trinn ifølge foreliggende oppfinnelse, mens arket som var anodisert i fosforsyre bare ga 80 000 kopier og arket som var anodisert i svovelsyre bare ga 120 000 kopier, men hadde stygt fargede ikke-billedflater. A print run of 120,000 copies was obtained from the sheet anodized in two steps according to the present invention, while the sheet anodized in phosphoric acid gave only 80,000 copies and the sheet anodized in sulfuric acid only gave 120,000 copies, but had badly colored non- image surfaces.
Eksempel 5 Example 5
Tre ytterligere aluminiumsark ble elektrokjemisk kornet og anodisert som i eksempel 1. Three additional aluminum sheets were electrochemically grained and anodized as in Example 1.
Arkene ble overtrukket med en bestrålingsømfintlig blanding som beskrevet i eksempel 5 i britisk patentsøknad nr. 8040090 (2,069,997AJ. og eksponert og fremkalt som i dette eksempelet. The sheets were coated with an irradiation sensitive composition as described in Example 5 of British Patent Application No. 8040090 (2,069,997AJ.) and exposed and developed as in this Example.
Lignende resultater som i eksempel 4 ble oppnådd. Similar results as in Example 4 were obtained.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO820428A NO158224C (en) | 1982-02-12 | 1982-02-12 | PROCEDURE FOR ANODIZING ALUMINUM SUBSTRATE FOR LITOGRAPHIC PRINT PLATE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO820428A NO158224C (en) | 1982-02-12 | 1982-02-12 | PROCEDURE FOR ANODIZING ALUMINUM SUBSTRATE FOR LITOGRAPHIC PRINT PLATE. |
Publications (3)
Publication Number | Publication Date |
---|---|
NO820428L NO820428L (en) | 1983-08-15 |
NO158224B true NO158224B (en) | 1988-04-25 |
NO158224C NO158224C (en) | 1988-08-03 |
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Application Number | Title | Priority Date | Filing Date |
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NO820428A NO158224C (en) | 1982-02-12 | 1982-02-12 | PROCEDURE FOR ANODIZING ALUMINUM SUBSTRATE FOR LITOGRAPHIC PRINT PLATE. |
Country Status (1)
Country | Link |
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NO (1) | NO158224C (en) |
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- 1982-02-12 NO NO820428A patent/NO158224C/en unknown
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Publication number | Publication date |
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NO158224C (en) | 1988-08-03 |
NO820428L (en) | 1983-08-15 |
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