US3425854A - Metal conditioning bath comprising sodium hydroxide,nitric acid,and gum arabic - Google Patents

Metal conditioning bath comprising sodium hydroxide,nitric acid,and gum arabic Download PDF

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Publication number
US3425854A
US3425854A US546579A US3425854DA US3425854A US 3425854 A US3425854 A US 3425854A US 546579 A US546579 A US 546579A US 3425854D A US3425854D A US 3425854DA US 3425854 A US3425854 A US 3425854A
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United States
Prior art keywords
bath
nitric acid
sodium hydroxide
gum arabic
metal
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US546579A
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Kern C Borden
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KERN C BORDEN
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KERN C BORDEN
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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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • 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
    • B41N3/036—Chemical or electrical pretreatment characterised by the presence of a polymeric hydrophilic coating

Definitions

  • the present invention relates to a bath for conditioning metal surfaces. More particularly it relates to a method of and a bath for chemically conditioning metal surfaces for application of the sensitizer used in photoengraving processes.
  • the bath of this invention comprises an alkali including substantially 8.3 by weight of sodium hydroxide, an acid including substantially 1% by weight of nitric acid, substantially 7% by weight of Water soluble protective coating agent, and substantially 83.7% by weight of water.
  • a sensitizer is applied to a sheet of metal and the negative of the positive to be printed is printed on the sensitizer.
  • the metal surface must be conditioned for the sensitizer and this conditioning is generally accomplished by a mechanical roughening of the surface, such as by buffing said surface.
  • the metal conditioning bath of this invention may be prepared in many ways, but the following procedure and commercial chemicals are preferred.
  • a sodium hydroxide mixture is formed by mixing enough sodium hydroxide flake technical, 50% liquid solution, to comprise 10.9% by Weight of the final solution with enough water to comprise 25% by weight of the final solution.
  • a nitric acid mixture is formed by mixing enough nitric acid, technical grade, 42 degrees Baum, to comprise 1.6% by weight of the final solution with enough water to comprise 23.4% by weight of the final solution.
  • the nitric acid mixture is then mixed with the sodium hydroxide mixture.
  • a water soluble protective coating agent such as gum arabic or karyo is then added.
  • gum arabic 14 degrees Baum, to comprise 7.1% by weight of the final solution is then mixed with the nitric acid-sodium hydroxide mixture. Water is added to the resulting mixture to make up the remaining 30% of the bath solution.
  • the final solution should be agitated sufiiciently to assure a complete mix.
  • the metal conditioning bath may then be applied to the metal surface prepared for sensitizing and application may be accomplished by either dipping the metal in the bath or by wiping or brushing the bath on the metal surface.
  • the bath is preferably brushed on the metal surface by a coir bristle scrub brush. The bath is brushed across the surface in one direction and then across the same surface in the opposite direction.
  • this conditioning bath in the above described manner causes the metal surface to grain, thus becoming roughened and prepared for application of the sensitizer.
  • the gum arabic protective coating agent protects the surface from the atmosphere during the chemical reaction. After the metal has become grained, the bath should then be thoroughly rinsed from the surface by water and the surface wiped clean with a sponge or cotton cloth.
  • the chemical reaction time is only five to ten seconds and the bath may be washed from the surface after that time.
  • the bath of this invention provides a convenient, economic and rapid means for preparing metal surface for application of photoengraving sensitizers.
  • a bath for conditioning a photographic metal plate prior to the application of a presensitizing agent to the plate which bath comprises by weight:
  • a bath as defined in claim 1' characterized in that the gum arabic is grade at 14 degrees Baum.

Description

United States Patent 3,425,854 METAL CONDITIONING BATH COMPRISING SODIUM HYDROXIDE, NITRIC ACID, AND GUM ARABIC Kern C. Borden, 4368 71st St., La Mesa, 'Calif. 92041 No Drawing. Filed May 2, 1966, Ser. No. 546,579 U.S. Cl. 106208 9 Claims Int. Cl. C09k 3/00; C231 1/08 ABSTRACT OF THE DISCLOSURE A method of and a bath for conditioning a photographic metal plate prior to the application of a presensitizer to the plate, the bath including a solution of sodium hydroxide, nitric acid, water soluble gum arabic and water.
The present invention relates to a bath for conditioning metal surfaces. More particularly it relates to a method of and a bath for chemically conditioning metal surfaces for application of the sensitizer used in photoengraving processes.
The bath of this invention comprises an alkali including substantially 8.3 by weight of sodium hydroxide, an acid including substantially 1% by weight of nitric acid, substantially 7% by weight of Water soluble protective coating agent, and substantially 83.7% by weight of water.
Other features and the advantages of the present invention will be apparent from the following description.
In the process of photoengraving, a sensitizer is applied to a sheet of metal and the negative of the positive to be printed is printed on the sensitizer. The metal surface must be conditioned for the sensitizer and this conditioning is generally accomplished by a mechanical roughening of the surface, such as by buffing said surface.
The metal conditioning bath of this invention may be prepared in many ways, but the following procedure and commercial chemicals are preferred. A sodium hydroxide mixture is formed by mixing enough sodium hydroxide flake technical, 50% liquid solution, to comprise 10.9% by Weight of the final solution with enough water to comprise 25% by weight of the final solution.
A nitric acid mixture is formed by mixing enough nitric acid, technical grade, 42 degrees Baum, to comprise 1.6% by weight of the final solution with enough water to comprise 23.4% by weight of the final solution.
The nitric acid mixture is then mixed with the sodium hydroxide mixture. A water soluble protective coating agent, such as gum arabic or karyo is then added. Preferably enough gum arabic, 14 degrees Baum, to comprise 7.1% by weight of the final solution is then mixed with the nitric acid-sodium hydroxide mixture. Water is added to the resulting mixture to make up the remaining 30% of the bath solution. The final solution should be agitated sufiiciently to assure a complete mix.
The metal conditioning bath may then be applied to the metal surface prepared for sensitizing and application may be accomplished by either dipping the metal in the bath or by wiping or brushing the bath on the metal surface. The bath is preferably brushed on the metal surface by a coir bristle scrub brush. The bath is brushed across the surface in one direction and then across the same surface in the opposite direction.
3,425,854 Patented Feb. 4, 1969 ice During this application, the met-a1 will be observed to turn from a shiny surface to a dull, cloudy, non-reflecting surface. If there are any resistant spots, there may be reapplication to these areas to effect the non-reflective finish.
Application of this conditioning bath in the above described manner causes the metal surface to grain, thus becoming roughened and prepared for application of the sensitizer. The gum arabic protective coating agent protects the surface from the atmosphere during the chemical reaction. After the metal has become grained, the bath should then be thoroughly rinsed from the surface by water and the surface wiped clean with a sponge or cotton cloth. When zinc or magnesium plates are being prepared, the chemical reaction time is only five to ten seconds and the bath may be washed from the surface after that time.
From the foregoing it will be apparent that the bath of this invention provides a convenient, economic and rapid means for preparing metal surface for application of photoengraving sensitizers.
While the form of embodiment herein described constitutes a preferred form, it is understood that other forms may be adopted falling within the scope of the claims that follow.
I claim:
1. A bath for conditioning a photographic metal plate prior to the application of a presensitizing agent to the plate, which bath comprises by weight:
(A) an alkali including substantially 8.3% NAOH;
(B) an acid including substantially 1% HNO (C) substantially 7% water soluble gum arabic;
(D) substantially 83.7% H 0.
2. A bath as defined in claim 1, characterized in that said alkali (A) is hydroxide flake technical, 50% liquid solution.
3. A bath as defined in claim 1, characterized in that said acid (B) is nitric acid, technical grade, 42 degrees Baum.
4. A bath as defined in claim 1', characterized in that the gum arabic is grade at 14 degrees Baum.
5. The steps in the method of conditioning a photographic metal plate prior to the application of a presensitizer to the plate, which steps comprise:
(A) preparing a solution containing the following by weight:
(1) an alkali including 8.3% sodium hydroxide, (2) an acid including 1% nitric acid, (3) a 7% water soluble gum arabic, (4) 83.7% water;
(B) applying the combined solution to the plate;
(C) thereafter rinsing the plate.
6. The steps in the method as defined in claim 5, characterized in that the application of the combined solution to the plate is by brushing said combined solution on the plate.
7. The steps in the method as defined in claim 5, characterized in that the application of the combined solution to the plate is by brushing said combined solution on the plate first on one direction and then in the other.
8. The steps in the method as defined in claim 5, characterized in that the application of the combined solution is by dipping the plate in said combined solution.
9. The steps in the method as defined in claim 5, characterized in that the application is continued until the surface of the metal plate being treated becomes nonreflective.
References Cited UNITED STATES PATENTS Tanner et a1 1486.15 Wood et a1 101465 Fink 1486.14
Griffith 1062 Whyzmuzis 106208 Cohn 9633 4 OTHER REFERENCES Roy L. Whistler, Industrial Gums, 1959, pages 243- 245.
5 JULIUS FROME, Primary Examiner.
T. MORRIS, Assistant Examiner.
US. Cl. X.R.
US546579A 1966-05-02 1966-05-02 Metal conditioning bath comprising sodium hydroxide,nitric acid,and gum arabic Expired - Lifetime US3425854A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1911726A (en) * 1931-07-07 1933-05-30 Metal Finishing Res Corp Production of phosphate coatings on metals
US2333221A (en) * 1940-02-28 1943-11-02 Interchem Corp Etching solution for lithographic plates
US2830536A (en) * 1955-12-15 1958-04-15 Harris Intertype Corp Lithographic printing
US2882153A (en) * 1954-02-04 1959-04-14 Polychrome Corp Planographic printing plate
US3279957A (en) * 1962-12-17 1966-10-18 D J Campbell Co Inc Method of producing a black oxide coating on ferrous metals
US3354824A (en) * 1964-05-04 1967-11-28 Interchem Corp Lithographic fountain solutions and method of use

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1911726A (en) * 1931-07-07 1933-05-30 Metal Finishing Res Corp Production of phosphate coatings on metals
US2333221A (en) * 1940-02-28 1943-11-02 Interchem Corp Etching solution for lithographic plates
US2882153A (en) * 1954-02-04 1959-04-14 Polychrome Corp Planographic printing plate
US2830536A (en) * 1955-12-15 1958-04-15 Harris Intertype Corp Lithographic printing
US3279957A (en) * 1962-12-17 1966-10-18 D J Campbell Co Inc Method of producing a black oxide coating on ferrous metals
US3354824A (en) * 1964-05-04 1967-11-28 Interchem Corp Lithographic fountain solutions and method of use

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