US3679418A - Process for treating a metal surface and reprographic material comprising a surface so treated - Google Patents

Process for treating a metal surface and reprographic material comprising a surface so treated Download PDF

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Publication number
US3679418A
US3679418A US762558A US3679418DA US3679418A US 3679418 A US3679418 A US 3679418A US 762558 A US762558 A US 762558A US 3679418D A US3679418D A US 3679418DA US 3679418 A US3679418 A US 3679418A
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US
United States
Prior art keywords
web
metal
treating
foil
treated
Prior art date
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Expired - Lifetime
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US762558A
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English (en)
Inventor
Joachim Stroszynski
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.)
Kalle GmbH and Co KG
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Kalle GmbH and Co KG
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Publication date
Application filed by Kalle GmbH and Co KG filed Critical Kalle GmbH and Co KG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/26—Electrographic processes using a charge pattern for the production of printing plates for non-xerographic printing processes
    • 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
    • B41N3/032—Graining by laser, arc or plasma means
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/151—Matting or other surface reflectivity altering material

Definitions

  • the invention relates to a process for roughening a metallic planographic printing plate, in which process the cleaning and roughening of the metallic surface are performed in a novel manner.
  • a metal foil serves as the support for the printing image.
  • Such metallic supports almost invariably must be cleaned, i.e. carefully freed from traces of grease adhering thereto from the rolling process, and, after cleaning, roughened on the surface which is to carry the printing image. Thereafter, the printing image is produced thereon.
  • the surface is modified before the printing image is applied in order to improve the adhesion of the printing image to the surface or to increase the hydrophilic properties of the surface, for example.
  • Cleaning of the foil is effected by washing or by a chemical or electrochemical treatment, and for roughening the foil, mechanical or also chemical or electrochemical methods are used.
  • Both the cleaning and the roughening of the foil surface are timeconsuming, require washing agents or other chemicals and are bothersome due to the necessity of removing or recovering the washing or treating agent used. Further, it is generally necessary to effect the cleaning and roughening of the foil surface in two separate process steps.
  • the present invention provides a process in which no, or considerably less, treating agents are required and must be removed as waste, and in which cleaning and roughening preferably are performed in a single process step.
  • the process of the invention is based on the known process for roughening planographic printing plates consisting of metal foils, preferably aluminum or steel foils, in which the surface of the metal foil is provided with a printing image after it has been roughened.
  • roughening of the surface is effected by treatment with a plasma jet.
  • Plasma jet treatments have only recently been introduced into the art.
  • Plasma jets are jets of gases of very high temperature and normally also of high gas speed.
  • jets of heated gases are regarded as plasma jets which have a temperature of more than 3000 C.
  • the gases have temperatures between 7000 and 25,000 C. They are generated most advantageously by means of an electric are produced in a protective gas, e.g. an argon atmosphere, between a heat-resistant electrode, e.g. a tungsten electrode, or a series of electrodes, on the one hand, and the web of material on the other hand.
  • a protective gas e.g. an argon atmosphere
  • a heat-resistant electrode e.g. a tungsten electrode, or a series of electrodes
  • the most suitable time of treatment maye be easily de- Patented July 25, 1972 termined by means of tests. It depends on the conditions of processing, e.g. on the kind of metal foil used, on the thickness of the foil and its heat capacity, and on the temperature surrounding the foil. It has proved to be of advantage to cool the foil with a cooling medium during the treatment, or to place it on a support cooled with
  • the appearance of the surface produced normally also can be referred to for judgment, it being advisable to also examine a microscopic enlargement.
  • a plasma jet produced by means of an argon welding device provided with a screened welding electrode it was observed that at am'perages between 10 and 60 amperes the treated surface changed its appearance within a very short time. Even by watching the appearance of the surface with the naked eye, it could be determined at which electrode distance, amperage, treating speed, and with which shape and position of the electric arc electrode the surface assumed the desired uniformly matte appearance.
  • the roughening process involves a cleaning of the surface. Therefore, cleaning of the surface prior to the plasma jet treatment can be dispensed with, and, consequently, foils which have not been freed fiom the rolling grease adhering to the surfaces are advantageously used in the process of the invention.
  • the process of the invention affords the possibility to combine the cleaning and roughening process with a modification of the plate surface.
  • the protective gas is mixed with smaller or larger quantities of air or oxygen, a certain degree of oxidation of the surface is caused, which, in the case of aluminum plates, for example, results in an improved hardness of the surface which in itself is desirable.
  • finely dispersed kieselguhr is introduced into the plasma jet, silicate formation on the surface is caused simultaneously with the cleaning and roughening efltect, which improves the hydrophilic properties of the surface.
  • the process of the invention offers the possibility of effecting a metallization of the surface, simultaneously with the roughening and, if necessary, cleaning, by introducing the finely pulverized metal into the plasma jet.
  • a bimetal plate is produced when the process of the invention is combined with a copper-plating of the surface, for instance.
  • a particularly hard surface is obtained by metallizing with titanium.
  • Hard metal carbides, such as silicon carbide, also may be applied to the treated surface by the process of the invention.
  • a particularly advantageous method for a plasma arc jet treatment of the surface of webs of metal foils which can be used not only for the preparation of metal support for printing plates, but also for other purposes, is a further feature of the present invention.
  • the upper surface of the web of metal foil is treated with a plasma are jet while the web is conveyed longitudinal in a horizontal direction, by generating a plasma are between a series of arc electrodes on the one hand and the web of metal foil on the other hand, in a zone which extends transversely across the web, while supplying, in the same zone, a stream of liquid cooling medium to the lower surface of the web over its entire width, and allowing the stream of cooling medium to flow oil in a horizontal discharge channel, which extends under that portion of the web which approaches the treating zone as well as under the portion which leaves it, so that the web of metal foil is supported by the cooling medium flowing off in the horizontal discharge channel.
  • a web of metal foil 3 is drawn ofi a roll 1 by coiling it to form the roll 8, with the aid of a driven winding device.
  • the web of metal foil is deflected over the contact roll 2, guided horizontally beneath a series of tungsten electrodes 4 mounted transversely of the web, and then again deflected over a second, driven, contact roll 7.
  • a series of electric arcs 5 is generated in a protective argon gas atmosphere.
  • a slot 10 in the lid. Through this slot, cooling medium from the container 6 is caused to issue by means of a pump (not shown).
  • the cooling medium spreads on the upper surface of the container lid and finally flows into a collecting vessel, from which it is pumped back into the container for the cooling medium.
  • the web of metal foil is supported by a horizontal layer of container 6 for a cooling medium, which is covered by a moves transversely over the web of metal foil, so that 1 the plasma arc jets act uniformly upon the foil surface.
  • the electrical contact between the web of metal foil and the source of current may be made over the cooling medium, provided it is electroconductive.
  • a process which comprises subjecting the surface of an aluminum or steel foil web to a uniform treatment with a plasma arc jet for a time suflicient to produce a matte appearance on said surface but insuflicient to uniformly melt said surface, said plasma arc jet being generated be tween a series of electrodes and one surface of said web in a zone extending transversely of said web while said web is conveyed transversely of said zone, and applying a liquid cooling medium to the other surface of said web.
  • a planographic printing plate comprising an aluminum or steel foil which has been subjected to a plasma jet treatment so that one surface thereof is roughened, and a photosensitive reproduction layer on said surface.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Coating By Spraying Or Casting (AREA)
US762558A 1967-09-28 1968-09-25 Process for treating a metal surface and reprographic material comprising a surface so treated Expired - Lifetime US3679418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1671508 1967-09-28

Publications (1)

Publication Number Publication Date
US3679418A true US3679418A (en) 1972-07-25

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US762558A Expired - Lifetime US3679418A (en) 1967-09-28 1968-09-25 Process for treating a metal surface and reprographic material comprising a surface so treated

Country Status (8)

Country Link
US (1) US3679418A (is")
AT (2) AT293448B (is")
BE (1) BE721461A (is")
ES (1) ES358608A1 (is")
FR (1) FR1584692A (is")
GB (2) GB1238701A (is")
NL (1) NL6813335A (is")
SE (1) SE342001B (is")

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850635A (en) * 1972-08-03 1974-11-26 Cutler Hammer Inc Method and apparatus for developing heat processable photographic film
US4082040A (en) * 1975-08-01 1978-04-04 Fuji Photo Film Co., Ltd. Lithographic printing plate
US4481237A (en) * 1981-12-14 1984-11-06 United Technologies Corporation Method of applying ceramic coatings on a metallic substrate
US4537845A (en) * 1982-10-20 1985-08-27 Olympus Optical Company Ltd. Multiconductive layer electrophotographic photosensitive device and method of manufacture thereof
US4537846A (en) * 1982-10-20 1985-08-27 Olympus Optical Company, Ltd. Multiconductive layer electrophotographic photosensitive device and method of manufacture thereof
US4596189A (en) * 1984-03-01 1986-06-24 Surface Science Corp. Lithographic printing plate
US4851327A (en) * 1986-07-17 1989-07-25 Fuji Photo Film Co., Ltd. Photographic color photosensitive material with two layer reflective support
US5045365A (en) * 1988-09-14 1991-09-03 Hitachi Chemical Company, Ltd. Process for producing metal foil coated with flame sprayed ceramic
WO1995010384A1 (en) * 1993-10-08 1995-04-20 Aluminum Company Of America Method of treating a metal surface
US5462609A (en) * 1991-03-18 1995-10-31 Aluminum Company Of America Electric arc method for treating the surface of lithoplate and other metals
US5674416A (en) * 1995-08-28 1997-10-07 Aluminum Company Of America Arc treatment of metal surfaces
US5830540A (en) * 1994-09-15 1998-11-03 Eltron Research, Inc. Method and apparatus for reactive plasma surfacing
US5906909A (en) * 1997-01-06 1999-05-25 Presstek, Inc. Wet lithographic printing constructions incorporating metallic inorganic layers
US6408755B1 (en) * 1999-08-31 2002-06-25 Agfa-Gavaert Method for erasing a lithographic printing master
US20080063811A1 (en) * 2006-09-13 2008-03-13 Industrial Technology Research Institute Method of adjusting surface characteristic of substrate
CN113524875A (zh) * 2021-09-17 2021-10-22 江苏友迪电气有限公司 一种热敏柔性ctp自动制版机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041138C2 (de) * 1980-10-31 1984-05-24 Vsesojuznyj naučno-issledovatel'skij institut Metiznoj promyšlennosti VNIIMETIZ, Magnitogorsk, Čeljabinskaja oblast' Verfahren zur Lichtbogenreinigung von Erzeugnisoberflächen
SE437682B (sv) * 1982-10-13 1985-03-11 Inventing Ab Sett och anleggning for att applicera en notningsbestendig beleggning pa ett tunnt metalliskt, bandformigt berarmaterial
GB9102562D0 (en) * 1991-02-06 1991-03-27 Bicc Plc Electric connectors and methods of making them
JPH09512129A (ja) * 1994-04-16 1997-12-02 セラマスピード リミテッド 電気抵抗発熱手段の製法

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850635A (en) * 1972-08-03 1974-11-26 Cutler Hammer Inc Method and apparatus for developing heat processable photographic film
US4082040A (en) * 1975-08-01 1978-04-04 Fuji Photo Film Co., Ltd. Lithographic printing plate
US4481237A (en) * 1981-12-14 1984-11-06 United Technologies Corporation Method of applying ceramic coatings on a metallic substrate
US4537845A (en) * 1982-10-20 1985-08-27 Olympus Optical Company Ltd. Multiconductive layer electrophotographic photosensitive device and method of manufacture thereof
US4537846A (en) * 1982-10-20 1985-08-27 Olympus Optical Company, Ltd. Multiconductive layer electrophotographic photosensitive device and method of manufacture thereof
US4596189A (en) * 1984-03-01 1986-06-24 Surface Science Corp. Lithographic printing plate
US4851327A (en) * 1986-07-17 1989-07-25 Fuji Photo Film Co., Ltd. Photographic color photosensitive material with two layer reflective support
US5045365A (en) * 1988-09-14 1991-09-03 Hitachi Chemical Company, Ltd. Process for producing metal foil coated with flame sprayed ceramic
US5481084A (en) * 1991-03-18 1996-01-02 Aluminum Company Of America Method for treating a surface such as a metal surface and producing products embodying such including lithoplate
US5462609A (en) * 1991-03-18 1995-10-31 Aluminum Company Of America Electric arc method for treating the surface of lithoplate and other metals
WO1995010384A1 (en) * 1993-10-08 1995-04-20 Aluminum Company Of America Method of treating a metal surface
US5830540A (en) * 1994-09-15 1998-11-03 Eltron Research, Inc. Method and apparatus for reactive plasma surfacing
US5674416A (en) * 1995-08-28 1997-10-07 Aluminum Company Of America Arc treatment of metal surfaces
US5906909A (en) * 1997-01-06 1999-05-25 Presstek, Inc. Wet lithographic printing constructions incorporating metallic inorganic layers
US6408755B1 (en) * 1999-08-31 2002-06-25 Agfa-Gavaert Method for erasing a lithographic printing master
US20080063811A1 (en) * 2006-09-13 2008-03-13 Industrial Technology Research Institute Method of adjusting surface characteristic of substrate
CN113524875A (zh) * 2021-09-17 2021-10-22 江苏友迪电气有限公司 一种热敏柔性ctp自动制版机

Also Published As

Publication number Publication date
GB1238701A (is") 1971-07-07
BE721461A (is") 1969-03-26
SE342001B (is") 1972-01-24
FR1584692A (is") 1969-12-26
GB1238702A (is") 1971-07-07
AT287018B (de) 1971-01-11
AT293448B (de) 1971-10-11
NL6813335A (is") 1969-04-01
ES358608A1 (es) 1970-10-16

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