EP0011771B1 - Rouleaux en aluminium anodisé avec une conductibilité électrique améliorée et procédé pour leur fabrication - Google Patents

Rouleaux en aluminium anodisé avec une conductibilité électrique améliorée et procédé pour leur fabrication Download PDF

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Publication number
EP0011771B1
EP0011771B1 EP79104486A EP79104486A EP0011771B1 EP 0011771 B1 EP0011771 B1 EP 0011771B1 EP 79104486 A EP79104486 A EP 79104486A EP 79104486 A EP79104486 A EP 79104486A EP 0011771 B1 EP0011771 B1 EP 0011771B1
Authority
EP
European Patent Office
Prior art keywords
aqueous
rollers
solution
anodised
metal salt
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
Application number
EP79104486A
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German (de)
English (en)
Other versions
EP0011771A1 (fr
Inventor
Rudolf Dr. Meyer
Günther Dr. Koepke
Roland Hourticolon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of EP0011771A1 publication Critical patent/EP0011771A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing

Definitions

  • the invention relates to aluminum rollers with an anodized surface which is improved in terms of electrical conductivity, and to a method for making anodized aluminum surfaces, in particular the surface of transport and guide rollers, electrically conductive.
  • Metal rollers are generally used to transport sheet-like materials made of paper or plastic film in processing machines. Steel rollers are often used, the surfaces of which are hard chrome-plated to reduce unwanted abrasion or to protect oxidation. The chrome-plated rollers are highly polished to protect sensitive materials from scratches.
  • the anodized layer has the disadvantage that it is no longer metallically conductive, on the contrary it is highly insulating. This property means that the otherwise ideal roller material loses almost any practical importance for the guidance and transport of paper, film or foil webs. Due to the contact of the webs with the roller surface and the detachment from the rollers and the associated friction, electrical charges of the webs and discharges occur as lightning. The handling of plastic films charged in this way is difficult and unpleasant.
  • the authors also describe a method by which light-sensitive silver halide is embedded in the pores of the anodized layer, thus creating the possibility of using; rh Exposure and development to produce photographically relatively insensitive, but mechanically very stable photographic images.
  • the invention is based on the object of improving the electrical conductivity of anodized layers on aluminum rollers and thus suppressing electrostatic charging of the web material which is conveyed by these rollers.
  • the object is achieved in that metal salts are incorporated into the previously cleaned pores of the anodized aluminum surfaces, the metal salts are reduced to metal, and thus an electrically conductive connection of the anodized outer surface with the metallic underlying aluminum surface is created.
  • Suitable as metals to be embedded in the channels or pores of the anodized layer are non-corrosive or slightly corrosive metals such as, for. B. gold, silver, copper, chromium, tungsten, molybdenum or the metals of group VIII of the periodic table. Metals which have good electrical conductivity and are relatively difficult to oxidize to form a less conductive connection are preferred.
  • a particularly good metallic, electrically conductive connection of the outer surface with the Metal surface of the roller body is achieved in that wetting agents are added to the metal salt solutions, which promote the penetration of the metal salt solutions.
  • An important measure before the treatment of an anodized aluminum roller according to the invention is the thorough cleaning of the anodized surface in order to open possibly smeared pores or channels.
  • An ultrasonic bath with a cleaning solution at 80 ° C, a subsequent rinsing in water and thorough drying have proven particularly useful.
  • the aluminum roller is immersed in the cleaning liquid and the bath is exposed to the action of an ultrasonic source.
  • cleaning agents generally contain detergent substances such as. As alkylbenzenesulfonates and fatty alcohols and possibly small amounts of fatty acid ethane, they also contain phosphates such as. B. pyrophosphate and tripolyphosphate, other inorganic salts such as sodium sulfate and possibly sodium chloride, occasionally also sodium silicates, borax and soda.
  • phosphates such as. B. pyrophosphate and tripolyphosphate
  • other inorganic salts such as sodium sulfate and possibly sodium chloride, occasionally also sodium silicates, borax and soda.
  • washing-active substances predominantly nonionic compounds, they can also contain, in particular, the addition products of ethylene oxide with fatty alcohols or alkylphenols and hydrotropic additives such as urea, alcohols or other organic solvents which promote clarity.
  • the cleaning agents used according to the invention are referred to below as "cleaning liquids containing surfactants”.
  • Examples include a 33% aqueous solution of the sodium salts of oxystearyl sulfate and oleylmethyl taurine, an aqueous solution containing tripotassium phosphate, polyphosphate and sodium lauryl sulfate or a 50% aqueous solution of benzyldodecylmethylammonium chloride.
  • wetting agents which contain ethylene oxide units in addition to carboxyl groups, such as the compounds, may be mentioned by way of example or further succinic acid derivatives such as the wetting agents or or also anionic wetting agents of the perfluorinated type. such as. the connections or
  • An aluminum plate with a 70 ⁇ m thick hard anodic coating produced in a known manner is cleaned with a 33% aqueous solution of the sodium salts of oxystearyl sulfate and oleyl methyl taurine at 80 ° C. in an ultrasonic bath, then rinsed in water and dried.
  • a 30% aqueous H 2 PtCl 6 solution is applied with a brush and dried.
  • the platinum salt is then reduced using a saturated aqueous SnCl 2 solution. This process can be repeated several times.
  • the surface resistance of the dry plate drops from 10 12 Q to 95 ⁇ due to the treatment.
  • the anodized aluminum plate is cleaned and the metal salt is applied as described in Example 1.
  • the reduction is carried out with a 2% phenidone solution in acetone. 3 cm 3 per liter of phenidone solution of a 4% aqueous solution of the compound of the formula C 8 F 17 SO 3 N (C 2 H 5 ) 4 are added as the wetting agent.
  • Example 2 In a modification of Example 1, an aqueous 1n HAuCl 4 solution with 5 cm 3 per liter of a 10% aqueous saponin solution is used as the metal salt solution. The reduction is carried out with a 4% aqueous hydrazine solution.
  • Example 1 In a modification of Example 1, a 15% aqueous Na 2 PdCl 4 solution with 3 cm 3 per liter of a 4% aqueous solution of the wetting agent of the formula C 8 F 17 SO 3 N (C 2 H 5 ) 4 is used as the metal salt solution .
  • the reduction is carried out with a 2% phenidone solution in acetone.
  • a saturated aqueous AgN 03 solution with 3 cm 3 per liter of a 4% aqueous solution of the wetting agent of the formula C 8 F 17 SO 3 N (C 2 H 5 ) 4 is applied several times to the anodized layer prepared according to Example 1.
  • the reduction is carried out with a 1: 1 mixture of 2% phenidone solution in acetone with 4% aqueous hydrazine solution.
  • the reducing solution contains 3 cm 3 per liter of the 4% aqueous solution of the wetting agent of the formula C 8 F 17 SO 3 N (C 2 H 5 ) 4 .
  • a saturated aqueous AgN0 3 solution with 3% by weight per liter of a 10% aqueous solution of the wetting agent saponin is applied to the anodized layer in accordance with Example 1.
  • the mixture is then bathed in an aqueous 2N NaCl solution. This process is repeated several times.
  • the following reduction solution is then used:
  • the anodized layer treated in accordance with Example 1 is bathed several times with a saturated aqueous solution of chromium alum. The reduction is then carried out using a 2% aqueous hydrazine solution.
  • a saturated aqueous CuCl 2 solution is applied to the anodized layer of Example 1 and then reduced with a 2% aqueous hydrazine solution.
  • Both solutions contain 5 cm 3 per liter of a 10% aqueous saponin solution as a wetting agent to ensure that the solutions of the metal salts and the reducing agents can penetrate to the bottom of the pores and channels of the anodized layer on the metallic aluminum.
  • the conductive layers produced according to the examples on the outer sides of the anodized layers have surface resistances between 1 ⁇ and 100 Q depending on the treatment time, repetition of the treatment and amount of wetting agent.
  • the surface resistances were measured according to DIN 53482, method A, at 20 ° C and 60% relative humidity.

Claims (6)

1. Rouleau en aluminium à surface poreuse oxydée électrolytiquement pour le transport et/pu le guidage de matières en feuilles ou en bandes pouvant être chargées électriquement, caractérisé en ce que des métaux non corrosifs on peu corrosifs sont incorporés dans les pores de la surface oxydée électrolytiquement.
2. Rouleau en aluminium suivant la revendication 1, caractérisé en ce que les pores de la surface oxydée électrolytiquement contiennenet un métal choisi parmi le groupe comprenant le cuivre, l'argent, l'or, le chrome, le tungstène et le molybdène, ou un métal du groupe VIII du Tableau Périodique.
3. Procédé de fabrication de rouleaux en aluminium ayant une surface poreuse oxydée électrolytiquement, ces rouleaux ayant une meilleure conductivité superficielle, caractérisé en ce qu'on nettoie tout d'abord la surface des rouleaux avec un liquide de nettoyage aqueux contenant des agents tensio-actifs, on imprègne la surface poreuse ainsi nettoyée avec une solution aqueuse d'un sel métallique, puis on traite cette surface avec la solution aqueuse d'un agent réducteur pour le sel métallique.
4. Procédé suivant la revendication 3, caractérisé en ce que, pour nettoyer sa surface, on plonge le rouleau dans le liquide de nettoyage aqueux contenant des agents tensio-actifs et on expose le bain à l'action d'un générateur d'ultrasons.
5. Procédé suivant les revendications 3 et 4, caractérisé en ce que la solution aqueuse d'un sel métallique contient un agent mouillant.
6. Procédé suivant les revendications 3 à 5, caractérisé en ce qu'on utilise des solutions aqueuses de sels de métaux choisis parmi le groupe comprenant le cuivre, l'argent, l'or, le chrome, le tungstène et le molybdène, ou un métal du groupe VIII du Tableau Périodique.
EP79104486A 1978-11-25 1979-11-14 Rouleaux en aluminium anodisé avec une conductibilité électrique améliorée et procédé pour leur fabrication Expired EP0011771B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2851153 1978-11-25
DE19782851153 DE2851153A1 (de) 1978-11-25 1978-11-25 Eloxierte aluminiumwalzen mit verbesserter elektrischer leitfaehigkeit und verfahren zu deren herstellung

Publications (2)

Publication Number Publication Date
EP0011771A1 EP0011771A1 (fr) 1980-06-11
EP0011771B1 true EP0011771B1 (fr) 1981-06-10

Family

ID=6055606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104486A Expired EP0011771B1 (fr) 1978-11-25 1979-11-14 Rouleaux en aluminium anodisé avec une conductibilité électrique améliorée et procédé pour leur fabrication

Country Status (4)

Country Link
US (1) US4288469A (fr)
EP (1) EP0011771B1 (fr)
JP (1) JPS5576092A (fr)
DE (2) DE2851153A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124522C2 (de) * 1981-06-23 1983-11-24 Dornier System Gmbh, 7990 Friedrichshafen Verfahren zur stromlosen Einfärbung poröser Materialien
JPS59153887A (ja) * 1983-02-22 1984-09-01 Trinity Ind Corp 前処理装置
US5882131A (en) * 1997-03-11 1999-03-16 Hewlett-Packard Company Printer drive roller with grit-blasted surface
US6330417B1 (en) * 2000-04-20 2001-12-11 Xerox Corporation Aluminized roll including anodization layer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988012A (en) * 1932-10-27 1935-01-15 Aluminum Co Of America Metal deposites in oxide coatings
US2151048A (en) * 1937-05-01 1939-03-21 Aluminum Co Of America Drying roll
US2151049A (en) * 1937-07-01 1939-03-21 Aluminum Co Of America Drying roll
DE882178C (de) * 1944-04-14 1953-07-06 Vaw Ver Aluminium Werke Ag Verfahren zum Schwarzfaerben von Gegenstaenden aus Aluminium und seinen Legierungen
US3711313A (en) * 1969-09-06 1973-01-16 Riken Light Metal Ind Co Process for the deposition of resinous films on aluminum-bearing substrates
US3782997A (en) * 1970-12-14 1974-01-01 Bendix Corp Method for sealing anodized beryllium components to improve dielectric and corrosion resistant properties
US3721613A (en) * 1971-12-06 1973-03-20 Sperry Rand Corp Article having an electroless deposition and method of producing such article
JPS5219535B2 (fr) 1972-10-28 1977-05-28
NO762506L (fr) * 1975-07-24 1977-01-25 Sumitomo Chemical Co

Also Published As

Publication number Publication date
EP0011771A1 (fr) 1980-06-11
DE2960407D1 (en) 1981-09-17
JPS5576092A (en) 1980-06-07
US4288469A (en) 1981-09-08
DE2851153A1 (de) 1980-06-04

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