US2084685A - Printing plate - Google Patents

Printing plate Download PDF

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Publication number
US2084685A
US2084685A US605636A US60563632A US2084685A US 2084685 A US2084685 A US 2084685A US 605636 A US605636 A US 605636A US 60563632 A US60563632 A US 60563632A US 2084685 A US2084685 A US 2084685A
Authority
US
United States
Prior art keywords
aluminum
plate
plates
printing
oxide
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 - Lifetime
Application number
US605636A
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English (en)
Inventor
Pierre R L Hogner
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.)
Alcoa Corp
Original Assignee
Aluminum Company of America
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
Priority to FR754325D priority Critical patent/FR754325A/fr
Application filed by Aluminum Company of America filed Critical Aluminum Company of America
Priority to US605636A priority patent/US2084685A/en
Priority to DE1933A0069324 priority patent/DE701076C/de
Application granted granted Critical
Publication of US2084685A publication Critical patent/US2084685A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the art of printing includes three general types 5 of processes which, depending upon the nature of the surface from which the printed impression is reproduced, may be designated broadly as engraying, lithographing and typographical reproduction.
  • This invention is particularly concerned with the metal plates used in the typographical or letter press printing processes and the engraving processes.
  • the plates, rolls or other forms of printing media used in these .processes are generally formed of copper, zinc,
  • the printing plate so produced has a hard, adherent surface which is more wear-resistant than aluminum plates heretofore known for this purpose and which may be used in the reproduction of a greater number 5 of copies of the desired design than has heretofore been possible.
  • the oxide coating should be characterized by a hardness substantially greater than that of the metal surface itself, by an adherence which will withstand the stresses to which such reproduction surfaces are subjected, and by an elasticity which will prevent chipping of the coating when the plate is subsequently provided with the desired design.
  • oxide coating may be used, such, for example, as the treatment of the aluminum surface by immersion or otherwise with a solution of an alkali carbonate containing a relatively small percentage of a soluble dichromate, or by anodic oxidation of the aluminum in a suitable electrolyte, such as a solution of sulfuric acid, chromic acid or oxalic acid.
  • a suitable electrolyte such as a solution of sulfuric acid, chromic acid or oxalic acid.
  • an anodic oxidation process as I have found that harder, more adherent coatings may be obtained thereby.
  • chromic acid solution containing about 3 to 5 per cent chromic acid or an oxalic 5 acid solution containing about 3 to 5 per cent oxalic acid.
  • Such oxide-coated aluminum plates are particularly suitable for use as engraving plates in the reproduction of etchings produced by the dry point method.
  • the design to be reproduced is cut into the face of the plate by means of a sharp instrument. This operation is usually performed by hand by a skilled artisan.
  • the engraving or cutting is done in such a manner that a thin wire edge.
  • aluminum plates which have been suitably oxide-coated, when engraved by thls method, have a useful life several times as long as that of an uncoated plate of similar metal.
  • the oxide coating being harder than the metal itself and being flexible and adherent, serves to reinforce the burr and prevent its wearing away.
  • the following example illustrates the results obtained by my invention when used in connection with aluminum engraving plates.
  • a plate of pure aluminum of commercial grade was anodically coated in a 7 percent aqueous solution of sulfuric acid, using a current density of 12 amperes per square foot for a period of 30 minutes. The temperature of the electrolyte was maintained at 25 centigrade. A very hard, flexible and adherent coating of aluminum oxide was thus produced on the plate.
  • the oxide-coated plate was then engraved with a suitable design in the usual dry point manner. The engraved plate thus produced was then used in reproducing ten prints of the design.
  • the etching plate after printing this number of etchings, still re-,
  • An improved aluminum engraving plate provided on its surface with a hard, elastic and adherent coating consisting substantially of aluminum oxide and having impressed thereon an intaglio design.

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  • Printing Plates And Materials Therefor (AREA)
US605636A 1932-04-16 1932-04-16 Printing plate Expired - Lifetime US2084685A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR754325D FR754325A (enrdf_load_html_response) 1932-04-16
US605636A US2084685A (en) 1932-04-16 1932-04-16 Printing plate
DE1933A0069324 DE701076C (de) 1932-04-16 1933-04-11 Kaltnadelradierplatte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US605636A US2084685A (en) 1932-04-16 1932-04-16 Printing plate

Publications (1)

Publication Number Publication Date
US2084685A true US2084685A (en) 1937-06-22

Family

ID=24424546

Family Applications (1)

Application Number Title Priority Date Filing Date
US605636A Expired - Lifetime US2084685A (en) 1932-04-16 1932-04-16 Printing plate

Country Status (3)

Country Link
US (1) US2084685A (enrdf_load_html_response)
DE (1) DE701076C (enrdf_load_html_response)
FR (1) FR754325A (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075895A (en) * 1960-02-15 1963-01-29 Gen Dev Corp Method of preparing plates for electromechanical engraving
US3935937A (en) * 1973-11-08 1976-02-03 Pitney-Bowes, Inc. Plastic and metal article of manufacture
FR2660247A1 (fr) * 1990-03-29 1991-10-04 Codecor Plaque d'impression pour tampographie.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB843625A (en) * 1955-12-21 1960-08-04 Gen Dev Corp Method of treating aluminum sheet stock for engraving purposes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075895A (en) * 1960-02-15 1963-01-29 Gen Dev Corp Method of preparing plates for electromechanical engraving
US3935937A (en) * 1973-11-08 1976-02-03 Pitney-Bowes, Inc. Plastic and metal article of manufacture
FR2660247A1 (fr) * 1990-03-29 1991-10-04 Codecor Plaque d'impression pour tampographie.

Also Published As

Publication number Publication date
FR754325A (enrdf_load_html_response) 1933-11-03
DE701076C (de) 1941-01-08

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