US3691030A - Process and apparatus for the continuous production of a lithographic surface - Google Patents

Process and apparatus for the continuous production of a lithographic surface Download PDF

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Publication number
US3691030A
US3691030A US97944A US3691030DA US3691030A US 3691030 A US3691030 A US 3691030A US 97944 A US97944 A US 97944A US 3691030D A US3691030D A US 3691030DA US 3691030 A US3691030 A US 3691030A
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United States
Prior art keywords
grinding
strip
electrolyte
electro
suspension
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Expired - Lifetime
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US97944A
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English (en)
Inventor
Joachim Stroszynski
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Individual
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Individual
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Priority claimed from DE19691962728 external-priority patent/DE1962728C3/de
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    • 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
    • C25D11/16—Pretreatment, e.g. desmutting
    • 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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S205/00—Electrolysis: processes, compositions used therein, and methods of preparing the compositions
    • Y10S205/921—Electrolytic coating of printing member, other than selected area coating

Definitions

  • ABSTRACT OF THE DISCLOSURE invention relates to a process and apparatus for the continuous production of a lithographic surface on a metal strip by-wet grinding and electro-chemical treatment 7 in an electrolyte.
  • the electrolyte is employed for wetting during grinding, and electro-chemical treatment and grinding are performed immediately following each other.
  • metal plates or foils e.g. aluminum or zinc plates or foils, which are to be used as lithographic printing plates, must be specially treated on their printing surfaces in order to impart to them particular properties which render them suitable for the intended purpose.
  • the surfaces treated in this manner are designated as lithographic surfaces.
  • a copper layer on an aluminum strip or a chromium or nickel-layeron a copper or brass strip thus producing a; bi-metal plate, or a chromium or nickel layer on the copper surface of acopper-plated aluminum strip, thus pro" ducing a tri-metal plate.
  • the known process for the continuous production of a lithographic surface on a metal strip by wet grinding and electro-chemical treatment in an electrolyte is used as a basis, and the electrolyte is used for wetting the material during the grinding process.
  • the electro-chemical treatment and grinding immediately follow each other. If the electro-chemical treatment in an electrolyte is an oxidizing process, the electrolyte in tended for the electro-chemical oxidation-which may be an aqueous acid bath or an aqueous alkaline bath-is used for wetting the grinding tools and the surface of the metal strip to be ground. If the electro-chemical treatment in an electolyte is an electroplating process, the electrolyte intended for the electroplating process, for example a solution of a copper, chromium or nickel salt, is used for wetting during the grinding process.
  • a fine-grained abrasive is suspended in the electrolyte, the metal strip is advanced in the direction of the strip during grinding, and grinding is effected by causing the abrasive suspen-" sion to impinge upon the travelling strip as a wide jetwhich extends over the entire width of the metal strip.
  • the fluid pressure required for achieving a particular effect may be produced and maintained in the slot die by means of a rotary pump, for example.
  • a sufiiciently high speed of the wide jet may be produced without employing a high fluid pressure by mixing the suspension of the electrolyte and the abrasive with an expanding gaseous or vaporous medium, preferably compressed air or steam, befor causing it to impinge upon the surface of the metal strip.
  • This method is by far superior to the employment of high fluid pressure. It is performed by means of slot dies which are constructed as mixing nozzles or injector nozzles.
  • the wide jet of abrasive suspension prefferably be centrifuged by a rotating body and the centrifuged jet to be directed such that it impinges transversely upon the travelling metal strip.
  • the wide jet of suspension may be directed either vertically or obliquely upon the travelling strip of metal.
  • the arrangement of the jet is determined by the desired effect and depends also upon the other process conditions, such as the impact speed of the jet and the feed speed of the strip. Of course, several wide jets of suspension may be caused to act one after the other upon the travelling metal strip.
  • the electrochemical treatment in an electrolyte may either precede or follow the wet grinding of the metal strip. If the treatment is an electrolytic oxidation of an aluminum strip, it is performed after grinding the surface of the metal strip. If the electro-chemical treatment is a galvanic metaldeposition, it is normally carried through before the grinding process, and the electro-deposited metal layer is then ground with a suspension of an abrasive in the electrolyte used for depositing the metal layer.
  • the electrolyte is caused to circulate between the grinding tool and the container in which the electro-chemical treatment takes place.
  • a substance forming a component of the electrolyte is spent in the process, a quantity of the same substance which replenishes the quantity consumed, may be added to the electrolyte at an appropriate point within the cycle.
  • waste products which may form in the course of the process may be drained off at a suitable point within the cycle.
  • FIGS. 1 and 2 of the drawings are diagrammatic representations of the most essential parts of two apparatuses suitable for performing the process of the invention.
  • the apparatus shown in FIG. 1 is used for graining a metal strip 1, for example an aluminum strip unrolled from a supply roll, not shown in FIG. 1.
  • the strip of material is fed from above to a horizontal drum 4 which is caused to rotate, and is wound around the drum after being deflected to the right hand side by means of a guide pulley 3. Thereafter, the strip of material is wrapped around almost the entire circumference of the drum 4. After being lifted from the surface of the drum, the strip of material is deflected upward by means of the guide pulley 3a.
  • the strip of material 1 is first conducted past an air knife 2, by which any dust which may be present on the.surface to be grained is blown off. Thereafter, a wide, free jet of liquid 6, of a thickness of several millimeters, ejected by a slot die 5 is caused to impinge on the strip of material across the entire width thereof and transversely to its direction of feed.
  • the Wide jet of liquid consists of a suspension of abrasive substances in an electrolyte suitable for the electro-chemical oxidation of aluminum surfaces, e.g. a dilute aqueous solution of sulfuric acid or nitric acid.
  • the drum 4 and the strip of material 1 thereon pass through a trough 8 which surrounds the lower part of the drum and in which the abrasive suspension 7 dripping from the strip of material is collected.
  • the aluminum strip passes electrodes 9 and 9a which surround it at a short distance, e.g. up to 10 cm. They are connected to one of the poles of a source of current (not shown in FIG. 1).
  • the counterelectrode connected to the other pole of the source of current may be the die or the drum 4. If the desired electro-chemical oxidation is an anodic oxidation, the die or the drum represent the counter-electrode and are connected to the anode of a direct-current source, while the electrodes 9 and 9a serve as cathodes.
  • the deepest part of the trough 8 is provided with a drain pipe 10 through which the abrasive suspension is drained off at a rate such that the suspension 7 contained in the trough 8 reaches to the desired level.
  • the drained suspension is advantageously circulated back to the die 5, if necessary after spent substances have been replenished and waste products removed.
  • the strip of metal is caused to pass through the apparatus in the opposite direction, so that it is conducted past the die 5 after leaving the trough 8.
  • the injector nozzle may be of the construction shown in FIG. 2.
  • the body of the die 5 contains an air chamber 12 with a wide-slotted air channel 13 through which a ribbon of air is blown into a funnel-type converging groove 16, which ends in a wide-slotted orifice 15.
  • the funnel-type groove 16 is connected over a wide-slotted suction channel 17 with a wide dipping channel 18 which dips into the abrasive suspension.
  • the wall of the trough 8 is provided with channels 19, through which cooling water is conducted in order to lead oif the heat generated during an electrolytic treatment.
  • the apparatus is sealed off from the surroundings -by the wallsfzgll and 21 which mainly serve the purpose of preventing the sprayed abrasive suspension from escaping.
  • normal hole-type nozzles of circular cross-section may be used.
  • Such dies must be oscillated across the width of the strip of material while it is being ground. It is also p9iP e for several hole-type mixing nozzles to be arranged side by side. For faster operating speeds and higher demands regarding unitormity, however, the above mentioned slot dies are more suitable.
  • the process of the invention has the advantage that it requires less space, can be performed at a higher speed, and causes less waste products than known processes yielding comparable results.
  • the operating speed of the process is caused in particular by the applicatign of the grinding process, which is described above as being preferred.
  • This grinding process results also in more hereormly grained products.
  • the use of this grinding method for the process of the invention has the further advantage that, besides grinding and subsequent oxidation of aluminum strips, normally no further process step is required for degreasing the aluminum strip, because the grinding process causes a satisfactory degreasing of the metal strip.
  • the process of the invention has the advantage that it is not necessary to separate the wet grinding agent from the electrolyte, so that a cleaning of the strip of material between the grinding step and the electro-chemical treatment can be omitted.
  • Electro-chemically oxidizing the aluminum strip immediately following the wet grinding process has the further advantage that no grinds can deposit on the surface roughened by grinding. Further, disturbances of the oxidation process by the action of the ambient atmosphere can be easily avoided, so that a very uniform oxide formation is achieved.
  • electro-chemical treatment is employed for the purpose of electrolytically roughening aluminum that has already been roughened by grinding, an additional degreasing of the aluminum strip can also be dispensed with in most cases, since the electrolyte used for the electrochemical toughening is uniformly incorporated in the surface of the metal strip during the grinding process.
  • the improve- 1 ment which comprises employing the electrolyte for wetting during the grinding process, and performing the electro-chemical treatment and grinding immediately following each other.
US97944A 1969-12-15 1970-12-14 Process and apparatus for the continuous production of a lithographic surface Expired - Lifetime US3691030A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691962728 DE1962728C3 (de) 1969-12-15 Verfahren zum kontinuierlichen Erzeugen einer lithographischen Oberfläche

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US3691030A true US3691030A (en) 1972-09-12

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US97944A Expired - Lifetime US3691030A (en) 1969-12-15 1970-12-14 Process and apparatus for the continuous production of a lithographic surface

Country Status (10)

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US (1) US3691030A (xx)
AT (1) AT300850B (xx)
BE (1) BE760330A (xx)
CH (1) CH558722A (xx)
ES (1) ES386457A1 (xx)
FR (1) FR2073768A5 (xx)
GB (1) GB1334067A (xx)
NL (1) NL7017765A (xx)
SE (1) SE375728B (xx)
ZA (1) ZA708407B (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4892102A (xx) * 1971-09-28 1973-11-30
US3935080A (en) * 1974-10-02 1976-01-27 Polychrome Corporation Method of producing an aluminum base sheet for a printing plate
US3969195A (en) * 1971-05-07 1976-07-13 Siemens Aktiengesellschaft Methods of coating and surface finishing articles made of metals and their alloys
US3972784A (en) * 1972-12-08 1976-08-03 Siemens Aktiengesellschaft Method for pretreating surfaces of electrically conductive materials prior to electroplating
US4183788A (en) * 1978-02-28 1980-01-15 Howard A. Fromson Process for graining an aluminum base lithographic plate and article thereof
US4585529A (en) * 1981-12-02 1986-04-29 Toyo Kohan Co., Ltd Method for producing a metal lithographic plate
US4613413A (en) * 1983-05-19 1986-09-23 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic plate
US4822457A (en) * 1988-01-25 1989-04-18 Usx Corporation Method of eliminating a fern-like pattern during electroplating of metal strip
US4851091A (en) * 1986-01-09 1989-07-25 Fuji Photo Film Co., Ltd. Process for producing support for lithographic printing plate
US5082537A (en) * 1989-03-30 1992-01-21 Hoechst Aktiengesellschaft Process and apparatus for roughening a substrate for photosensitive layers
US5314607A (en) * 1991-06-21 1994-05-24 Fuji Photo Film Co., Ltd. Apparatus and method for anodizing supports for lithographic printing plate
US5325637A (en) * 1991-10-31 1994-07-05 Konica Corporation Developing apparatus with an improved sleeve
US6261438B1 (en) 1998-12-21 2001-07-17 Agfa-Gevaert Nv Method and apparatus for roughening a support for radiation-sensitive coatings
US6423206B1 (en) 1999-03-02 2002-07-23 Agfa-Gevaert N.V. Method for electrochemical roughening of a substrate
CN104404587A (zh) * 2014-11-28 2015-03-11 沈阳飞机工业（集团）有限公司 一种降低喷砂介质嵌入电镀钢制表面的方法
US20170241037A1 (en) * 2014-08-07 2017-08-24 Henkel Ag & Co. Kgaa Apparatus for electroceramic coating of high tension cable wire

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969195A (en) * 1971-05-07 1976-07-13 Siemens Aktiengesellschaft Methods of coating and surface finishing articles made of metals and their alloys
JPS5115767B2 (xx) * 1971-09-28 1976-05-19
JPS4892102A (xx) * 1971-09-28 1973-11-30
US3972784A (en) * 1972-12-08 1976-08-03 Siemens Aktiengesellschaft Method for pretreating surfaces of electrically conductive materials prior to electroplating
US3935080A (en) * 1974-10-02 1976-01-27 Polychrome Corporation Method of producing an aluminum base sheet for a printing plate
US4183788A (en) * 1978-02-28 1980-01-15 Howard A. Fromson Process for graining an aluminum base lithographic plate and article thereof
US4585529A (en) * 1981-12-02 1986-04-29 Toyo Kohan Co., Ltd Method for producing a metal lithographic plate
US4613413A (en) * 1983-05-19 1986-09-23 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic plate
US4851091A (en) * 1986-01-09 1989-07-25 Fuji Photo Film Co., Ltd. Process for producing support for lithographic printing plate
US4822457A (en) * 1988-01-25 1989-04-18 Usx Corporation Method of eliminating a fern-like pattern during electroplating of metal strip
US5082537A (en) * 1989-03-30 1992-01-21 Hoechst Aktiengesellschaft Process and apparatus for roughening a substrate for photosensitive layers
US5314607A (en) * 1991-06-21 1994-05-24 Fuji Photo Film Co., Ltd. Apparatus and method for anodizing supports for lithographic printing plate
US5325637A (en) * 1991-10-31 1994-07-05 Konica Corporation Developing apparatus with an improved sleeve
US6261438B1 (en) 1998-12-21 2001-07-17 Agfa-Gevaert Nv Method and apparatus for roughening a support for radiation-sensitive coatings
US6423206B1 (en) 1999-03-02 2002-07-23 Agfa-Gevaert N.V. Method for electrochemical roughening of a substrate
US20170241037A1 (en) * 2014-08-07 2017-08-24 Henkel Ag & Co. Kgaa Apparatus for electroceramic coating of high tension cable wire
CN104404587A (zh) * 2014-11-28 2015-03-11 沈阳飞机工业（集团）有限公司 一种降低喷砂介质嵌入电镀钢制表面的方法

Also Published As

Publication number Publication date
AT300850B (de) 1972-08-10
NL7017765A (xx) 1971-06-17
ZA708407B (en) 1971-10-27
DE1962728A1 (de) 1971-06-16
ES386457A1 (es) 1973-11-16
FR2073768A5 (xx) 1971-10-01
DE1962728B2 (de) 1977-03-10
SE375728B (xx) 1975-04-28
CH558722A (de) 1975-02-14
BE760330A (fr) 1971-06-14
GB1334067A (en) 1973-10-17

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