US3330212A - Etching machine paddle - Google Patents

Etching machine paddle Download PDF

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Publication number
US3330212A
US3330212A US504965A US50496565A US3330212A US 3330212 A US3330212 A US 3330212A US 504965 A US504965 A US 504965A US 50496565 A US50496565 A US 50496565A US 3330212 A US3330212 A US 3330212A
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United States
Prior art keywords
paddle
plate
vanes
etching
machine
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
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US504965A
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English (en)
Inventor
Marvin H Fishaber
John D Hickerson
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Priority to US504965A priority Critical patent/US3330212A/en
Priority to DED33924U priority patent/DE1950060U/de
Priority to NL6610934A priority patent/NL6610934A/xx
Priority to GB46748/66A priority patent/GB1109868A/en
Application granted granted Critical
Publication of US3330212A publication Critical patent/US3330212A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B3/00—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings
    • 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
    • C23F1/08—Apparatus, e.g. for photomechanical printing surfaces

Definitions

  • This invention relates to etching machines and more particularly concerns a novel paddle device, especially useful in curved plate powderless etching, and adapted to be used in curved plate etching machines.
  • the primary object of the present invention is to provide an improved paddle device for use in a curved plate powderless etching machine.
  • Another object of the invention is to provide a novel paddle for impinging etchant in a powderless etching machine onto a curved segment or cylinder at an angle of less than 90 degress to the axis of said cylinder.
  • Another object of the invention is to provide such a paddle which will impinge etchant onto a rotating plate in a sequential cycle of alternately opposing angles of less than 90 degrees to the plate or cylinder axis.
  • FIG. 1 is an isometric view, partially cut away of an etching machine utilizing the novel paddle of the present invention wherein two paddles of one embodiment of the novel paddle device are disposed within the machine in a spaced relationship to each other on opposite longitudinal sides of a rotating curved plate held by a cylindrical plate holder or mandrel.
  • FIG. 2 is a side view of one of a novel paddle device similar to that shown in FIG. 1 except that the arrays of vanes on the fins thereof are oppositely directed.
  • FIG. 3 is an end view of the novel paddle device shown in FIG. 1.
  • the novel paddle 8 of the present invention comprises in general a plurality of longitudinally disposed outwardly extended fin members 10 around or forming an axle 12 on which to rotate.
  • Each such fin 10 is provided along its lip or outer longitudinal portion 14 a longitudinal array 16 of parallel spaced directional vanes 18, with each set of vanes being preferably alternately directionally opposed.
  • the lip or outer longitudinal portion 14 of each fin 10 wil be angled in a common direction (toward the plate) so as to scoop-11p or skim etchant from the supply thereof at the bottom of the machine and impinge same against the rotating plate. These angles should not preferably exceed about 60.
  • FIG. 2 in side elevation shows in a more clear manner the alternating directional attitude of the vanes 18 on the various fins 10, and
  • FIG. 3 shows an end view of the 3,330,212 Patented July 11, 1967 paddle and the common angulus disposition of the lip of each fin.
  • the fins While there is no actual limitation as to the number of fins comprising the present novel paddle, a preferred and convenient number has been found to be four (4). In any event, the fins should be reasonably and equally spaced apart. It is preferred to have the direction of the vanes on the lip of alternate fins as opposing so as to impinge etchant first in one direction and then in another. The direction of the vanes, however, may be cycled in most any manner to obtain the desired etching effect as heretofore described.
  • the present device In order that the present device be resistant to attack itself by the various etching solutions, most of which contain appreciable amounts of mineral acids such as nitric and hydrochloric acids, the device should be fabricated, for example, of stainless steel or other acid etch-resistant material.
  • the advantages of the invention are that a significant improvement in shoulder uniformity of an etched image is obtained which allows deeper etching without undercutting of the image in the transverse direction of the curvature. Cleaner edges of the highlight dot areas in the direction of curvature are also obtained.
  • the paddles of the present invention can also be used for high quality etching of flat plates. Thus, if a machine has two plate movement mechanisms (i.e., one detachable means for movement of a fiat plate and a separate means for movement of a cylindrical or curved plate) the same machine can be conveniently used for etching either kind of printing plate. Overall, a general improvement in the appearance and quality of the etched curved plate is obtained by means of the present invention.
  • curved plate or curved segment refers broadly to curved surfaces in general use for engraving and printing and include, for example, magnesium or zinc plate, sheet, thin wrap-around sheet, extruded tubing, extruded cylinders, impact extruded cans, thin wrap-around foil, and the like.
  • Example of invention A standard model M-32 Master brand powderless etching machine adapted for curved plates was modified by removing the conventional paddles (2 in number) and replacing these with one embodiment of present novel paddles substantially as shown in the appended drawing. The machine so-modified was then charged with 77 liters of a powderless etc-hing bath comprising 10 volume percent of 42 B. nitric acid, 0.685 percent by volume of monochlorododecyl diphenyloxide sodium sulfonate; 0.15
  • the bath was adjusted to a temperature within the range of fromabont 70 to 73 F.
  • An etchable combinationcurvedplate or segment 8 inches in diameter exhibiting line and halftone image areas was clamped to the mandrel in the machine and rotated at about 30 to 60 'r.p.m., the direction of rotation being reversed about every seconds. Vanes on the fins of the paddles were longitudinal axis of the paddle.
  • the paddles in the machine were also rotated at from about 300 to about 380 r.p.m. so as to splash etchant bath against the plate.
  • the 1 machine was operated in this manner 'for about 8-10 minutes, whereupon, the machine was stopped and the etched plate removed and rinsed.
  • the depth of etch varied from 18 to 21 thousandths of an inch. Because of the angle of the vanes on the paddle fins the angle at which the etchant impinged the plate during the etching 'operation was substantially non-perpendicular to the longitudinal axis of the plate.
  • an average angle of difference was obtained by computing the image shoulder angle in the direction of curvature and also in the transverse direction and determining the average difference over a number of measurements on the plate.
  • the angle of difference so-determined was about 18, which is very acalternately set at opposing angles of about 30 to the a ceptable and quite desirable. This showed that an image a .dot, for example, had a substantially uniform shoulder.
  • a rotatable paddle for use in curved plate etching machines comprising: a plurality of fin members each coupled along one longitudinal edge to form aycommon axle, the outer longitudinal portion' of each fin carrying an array of parallel, spaced, directional vanes, said vanes being disposed at an angle of less than to the longitudinal axis of the paddle and at least two of said arrays of vanes being directionally opposed.
  • each fin is angled at less than 90"to the trans:
  • novel paddles of the present invention 7 H. F. RADUAZO, Assistant Examiner.
  • he fin members are four formly spaced fin members, the array of vanes on each fin being directionally opposed to the vanesof the ad- 1 wherein the outer longitudinal i

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US504965A 1965-10-24 1965-10-24 Etching machine paddle Expired - Lifetime US3330212A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US504965A US3330212A (en) 1965-10-24 1965-10-24 Etching machine paddle
DED33924U DE1950060U (de) 1965-10-24 1966-08-03 Ruehrwalze fuer aetzmaschinen.
NL6610934A NL6610934A (enrdf_load_stackoverflow) 1965-10-24 1966-08-03
GB46748/66A GB1109868A (en) 1965-10-24 1966-10-19 Improved etching machine paddle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US504965A US3330212A (en) 1965-10-24 1965-10-24 Etching machine paddle

Publications (1)

Publication Number Publication Date
US3330212A true US3330212A (en) 1967-07-11

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ID=24008455

Family Applications (1)

Application Number Title Priority Date Filing Date
US504965A Expired - Lifetime US3330212A (en) 1965-10-24 1965-10-24 Etching machine paddle

Country Status (4)

Country Link
US (1) US3330212A (enrdf_load_stackoverflow)
DE (1) DE1950060U (enrdf_load_stackoverflow)
GB (1) GB1109868A (enrdf_load_stackoverflow)
NL (1) NL6610934A (enrdf_load_stackoverflow)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE71697C (de) * H. C. GARDNER, Vanderbilt Building Nr. 6, Nashville, County of Davidson, State of Tennessee, V. St. A Schöpfrad mit Wasserabflufs durch seine hohle Welle
US195865A (en) * 1877-10-02 Improvement in fan-blowers
US515314A (en) * 1894-02-20 Stovepipe or flue cleaner
GB191326604A (en) * 1913-11-19 1914-09-10 Selas Lighting Company Ltd Improvements relating to Rotary Pumps or Compressors.
US1325591A (en) * 1919-12-23 stecker
US1758062A (en) * 1928-07-28 1930-05-13 Daniel B Replogle Centrifugal fan and method of making the same
US2145652A (en) * 1935-11-26 1939-01-31 Lionel Corp Signal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE71697C (de) * H. C. GARDNER, Vanderbilt Building Nr. 6, Nashville, County of Davidson, State of Tennessee, V. St. A Schöpfrad mit Wasserabflufs durch seine hohle Welle
US195865A (en) * 1877-10-02 Improvement in fan-blowers
US515314A (en) * 1894-02-20 Stovepipe or flue cleaner
US1325591A (en) * 1919-12-23 stecker
GB191326604A (en) * 1913-11-19 1914-09-10 Selas Lighting Company Ltd Improvements relating to Rotary Pumps or Compressors.
US1758062A (en) * 1928-07-28 1930-05-13 Daniel B Replogle Centrifugal fan and method of making the same
US2145652A (en) * 1935-11-26 1939-01-31 Lionel Corp Signal

Also Published As

Publication number Publication date
DE1950060U (de) 1966-11-17
GB1109868A (en) 1968-04-18
NL6610934A (enrdf_load_stackoverflow) 1967-04-25

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