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
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/24—Stencils; Stencil materials; Carriers therefor

Definitions

• This invention relates to duplicating by the employment-of flexible stencils such, for instance," as” may be formed by stencilizing bv pressure so-called stencil sheets or by photographic means.
• the ink resisting elements in a stencil produced by photographic means may, as I have indicated, be formed by exposing a suitable light sensitive pelliole to .the action of light in order tofform thereon a positive or a negative image of a screen which is provided with lines, dots or rcticulations and then again exposing the light sensitive pellicle to the action of hght under conditions adapted to formthereon an image of the matter to be reproduced.
• the presentinvention is based upon the observation that a similar result can be secured byarranging-behind or' in front of the stencil layer of a stencil of the normal character when in use, a sheet which is pro videdat suitable intervals with elements adapted to resist the passage of ink.
• the invention also consists in a sheet adapted to be arranged in association with encil in'the manner above indicated, formed of porous flexible material furnished at intervals with ink resistingelements constituting, for instance, a' series of lines, dots,
• the invention further consists in the combination of a stencil or a sheet adapted to be stencilized by pressure or otherwise and a sheet? of porous flexible material furnished at intervals with ink resisting'elements.
• a sheet of the character in question may comprise a sheet of porous material such as a felted or woven network of filaments and provided with ink resisting elements of the character above indicated.
• the sheet material used ma be finelawn or other Woven fabric of suificientlyfine texture or it may be a sheet of suitable porous paper such as yoshino paper.
• the ink resisting elements maybe formed on the sheet by photographic means; thus, for instance, the sheet may be coated with a layer of alight sensitive material which by exposure to the action of light will be changed in respect to its solubility in certain solvents used as developers in order to form" a plurality of ink impermeablelines, dots or reticulations.
• the sheet of porous material maybe coated with'bichromated gelatine and the sheet exposed to the action oflight behind a lined, dotted or re tic'ulated transparency, andafter such exposure the sheet treated in order to remove the portions of the light sensitive composition which have not beenrendered insoluble.
• a similar representation of a lined, dotted or -reticulatedsubject may be formed by the action of light on a pellicle of bichromated gelatine or an equivalent light sensitive composition supported upon a suitable backing or support from, which it is transferred to a temporary support for development, the developed image being then transferred to the sheet of porousmaterial.
• a sheet provided with the ink resisting lines, dots and reticulations may be adopted; for instance, a sheet of asuitable porous material may be subjected to a printing operation by the employment of engraved rollers by which a suitable ink resisting medium may I be applied to theporous material.
• dots-or reticulations of ink resisting material andthe sheet thus obtalned may then be coatedw-ith a composition such, for instance,
• the paper may be in order to prevmttheoompositlon fo the coating which isadapted to he stencilizedsoakingintoitssuhdmee.
• a dancil for me in duplicating on a ad which is saturated "with ink or to'secure t e stencil to a flexible car rier of silk gauze or the like and insome cases to arrangebetween the pador gauze carrier a sheet of yoshino or like paper.
• a combination stencil sheet including a to'be stencilizedfbyp .and a sheet of porous material furnished at intervals with ink-resisting elements,
• a combination stencil sheet including a sheet adapted to be stencilized by pressure and a' sheet of porous material furnished at intervals with ink-resistin elments the two said sheets being secure together and secured to a backing sheet.
• a combination stencil sheet including i a sheet adaptedto be steneili'zed by pressure and a sheet of porous material furnished at I intervals with ink-resisting element's,

Landscapes

• Printing Plates And Materials Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10082591

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (4)

• 1924
  • 1924-07-11 GB GB16729/24A patent/GB237090A/en not_active Expired
• 1925
  • 1925-05-16 DE DEG64340D patent/DE424835C/de not_active Expired
  • 1925-05-25 US US32840A patent/US1611021A/en not_active Expired - Lifetime
  • 1925-06-11 FR FR599335D patent/FR599335A/fr not_active Expired

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