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
  • B41N1/243—Stencils; Stencil materials; Carriers therefor characterised by the ink pervious sheet, e.g. yoshino paper
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
  • Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
  • Y10T428/249963—And a force disintegratable component [e.g., stencil sheet, etc.]
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31801—Of wax or waxy material
  • Y10T428/31804—Next to cellulosic
  • Y10T428/31808—Cellulosic is paper

Definitions

• This invention relates to stencil sheets for use in duplicating manuscript or typewritten matter, drawings and the like of thekind in which the ink-resisting medium of the 5 stencil sheet is adapted to be displaced or its character altered by the local application of pressure to the stencil sheet with the aid of a style or by type faces.
• the object of the present invention is to provide an improved stencil sheet of the kind in which the ink-resisting medium of the stencil sheet contains as its essential gelatinizing constituent a cellulose derivative such, for instance, as a cellulose ester and particu- 15 larly nitrocellulose together with a tempering agent or agent adapted to modify the physical properties of the gelatinzing constituent in such manner as to facilitate stencilizing.
• a cellulose derivative such, for instance, as a cellulose ester and particu- 15 larly nitrocellulose
• an hydroxy fatty acid in the free state is included in the composition as a tempering agent.
• ricinoleic acid in the free state may be employed.
• castor oil which of course is composed mainly of the triglyceryl ester of ricinoleic acid, has been employed as a tempering or softening agent in the'production of stencil sheets the essential gelatinizing constituent of which is nitrocellulose.
• ricinoeic acid in the free state possesses certain advantages over the use of triglyceryl ester of the said acid in the production of stencil sheets of this cellulose ester type in that, for instance, its employment enables stencil sheets to be obtained which are of a less adhesive character than similar sheets produced with the aid of castorloil, which consists wholly or mainly of the triglyceryl ester of ricinoleic acid; 'Moreover, as ricinoleic acid and other higher hydroxy fatty acids do notharmfully afiect rubber by causing it to swell and warp as do the saturated non-hydroxy fatty acids, stencil sheets pro- .duced in accordance with the invention do not exert a harmful effect upon the rubber in feed rollers and other rubber parts of typewriters with which they are brought into contact in the operation of stencilizing.
• ricinoleic acid Normally ricinoleic acid will be employed as the sole tempering agent or at least as the main tempering agent.
• the proportion of ricinoleic acid relative to the essential gelatinizing constituent of the coating composition will vary in accordance with the character of the said constituent or the physical strength thereof when in the 0 form of a film.
• WVith nitrocellulose as the essential gelatinizing constituent the proportion will vary in accordance with the variation in the viscosity of the solution formed by dissolving a given amount of the nitrocellulose in a given solvent.
• the proportion of ricinoleic acid will be greater with nitrocelluloses giving solutions of higher viscosity than with nitro'celluloses giving less viscous solutions.
• the ratio of nitrocellulose to ricinoleic acid will usually be from 1: 10 to 1: 16.
• Yoshino paper is coated with this composition in any known manner, as for instance by drawing sheets of yoshino paper over a roller partly immersed in a body of the composition.
• the coated sheets are dried under normal atmospheric temperature, say F and pref- 'erably under conditions as to humidity corresponding with, a wet bulb thermometer reading of 50 F.
• a stencil sheet coating which includes a cellulose ester and a hydroxy fatty acid of the ricinoleic series in the free state as the tempering agent therefor.
• a stencil sheet coating which includes a cellulose ester and ricinoleicacid as the tempering agent therefor.
• stencil sheet coating consisting essentially of nitrocellulose and a hydroxy fatty acid of the ricinoleic series in the free state as the main tempering agent.
• a type impressionable stencil sheet comprising an open porous base having a coating including a cellulose ester and a hydroxy fatty acid of the ricinoleic series in the free state as the main tempering agent.
• a stencil sheet adapted to be stencilized by pressure comprising an open porous base having a coating including nitrocellulose and a hydroxy fatty acid of the ricinoleic series in the free state as the main tempering agent.
• a stencil sheet a'da ted to be stencilized by pressure consisting o yoshino paper coated with a cellulose ester in association with a hydroxy fatty acid of the ricinoleic series in the free state as the main tempering agent.
• a stencil sheet adapted to be stencilized by pressure consisting of yoshino paper coated with nitrocellulose in association with a hydroxy fatty acid of the ricinoleic series in the free state as the main tempering agent.
• a stencil sheet adapted to be stencilized by pressure consisting of yoshino paper coated with a cellulose ester in association with ricinoleic acid as the main tempering agent.
• a stencil sheet adapted for stencilizing by pressure consisting of a base of fibrous material having a coating including esters of polysaccharides and hydroxy fatty acids of the ricinoleic series.
• a stencil sheet adapted for stencilizing by pressure consisting of a base of fibrous material having a coatln including esters of polysaccharides and riclnoleic acid.

Landscapes

• Printing Plates And Materials Therefor (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10347043

Family Applications (1)

Country Status (4)

Cited By (2)

• 0
  • BE BE399660D patent/BE399660A/xx unknown
• 1927
  • 1927-12-06 GB GB32992/27A patent/GB303631A/en not_active Expired
• 1928
  • 1928-11-13 FR FR663861D patent/FR663861A/fr not_active Expired
  • 1928-11-22 US US321275A patent/US1828766A/en not_active Expired - Lifetime

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