US3562003A - Electrostencil - Google Patents

Electrostencil Download PDF

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Publication number
US3562003A
US3562003A US651778A US3562003DA US3562003A US 3562003 A US3562003 A US 3562003A US 651778 A US651778 A US 651778A US 3562003D A US3562003D A US 3562003DA US 3562003 A US3562003 A US 3562003A
Authority
US
United States
Prior art keywords
sheet
stencil
electrically conductive
paper
backing sheet
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
US651778A
Other languages
English (en)
Inventor
Alfred Frohlich
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.)
AS FOR KONTOR KEMI
KEMI AS
Original Assignee
KEMI AS
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 KEMI AS filed Critical KEMI AS
Application granted granted Critical
Publication of US3562003A publication Critical patent/US3562003A/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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/246—Stencils; Stencil materials; Carriers therefor characterised by the electroconductive means or additives
    • 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]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31899—Addition polymer of hydrocarbon[s] only
    • Y10T428/31902—Monoethylenically unsaturated

Definitions

  • a stencil blank includes a stencil sheet which is capable of being perforated by electric sparks, the stencil sheet being juxtaposed with and supported on a backing sheet made of an electrically conductive material.
  • the backing sheet may comprise electrically conductive black glazed paper.
  • the stencil sheet may be formed entirely of an inherently electrically conductive syntheti cresin.
  • the stencil sheet comprises a thin sheet of paper containing finely dispersed carbon particles and coated with a layer of inherently electrically conductive synthetic resin.
  • This invention relates to stencil blanks adapted to be electrically perforated, and more specifically to stencil blanks of the type comprising a stencil sheet having an electric conductivity suflicient for perforation of the sheet by means of electric sparks, and a backing sheet.
  • Stencils of this type are known in various forms. The simplest in principle, however the most difficult to make, only consist of a backing sheet of paper of the type generally used for such purposes, and a film of synthetic resin fastened thereto in a readily strippable manner, in which carbon particles, such as carbon black, are dispersed in such a manner that the carbon concentration and, accordingly, the electric conductivity of the film increases from the front side of the film remote from the backing sheet towards the back side of the film.
  • the backing sheet may be coated first with a film of synthetic resin having a relatively high concentration of carbon particles, and subsequently with an additioanl film having a lower carbon particle concentration. These films may be applied in the form of solutions in different solvents.
  • a thin paper sheet loaded with carbon particles is coated on both sides with synthetic resin equally containing carbon particles. The sheet prepared in this manner is fastened to the backing sheet in the manner usual in stencil blanks.
  • a common drawback in the electro stencils described hereinbefore is that the manufacture thereof is complicated and expensive, because a very homogeneous, exactly proportioned distribution of the electrically conductive particles over the area of the stencil sheet has to be insured, and that, even if the stencil blank is made in the most careful manner, the prints made therewith become relatively unsharp and grainy, because the electric conductivity is limited to the several carbon particles incorporated in the material.
  • the invention provides a stencil blank of the kind referred to, in which at least a layer of the stencil sheet consists of an inherently electrically conductive synthetic resin.
  • Such resins may, in all of the known electrostencils described hereinbefore, replace the carbon particle loaded resins used heretofore, i.e. the stencil sheet may consist entirely of inherently electrically conductive synthetic reisn, or a thin sheet of paper loaded with carbon particles may be coated with such resin.
  • Synthetic resins having inherent electrically conductive properties are known, but so far not in common use.
  • One group comprises polyolefins the chain structure of which has been modified through electronic bombardment.
  • Another group comprises polyamides made conductive through vacuum pyrolysis at 850 centigrade.
  • various polymers are susceptible of transformation into polykations connected with negative tetracyanoquino-di-methane ions, the conductivity being controlled by the amount of tetracyanoquino-di-methane used. This list is not complete, and a constant development is taking place in this field.
  • the inherently electrically conductive synthetic resins afford the advantage, as compared with the carbon particle loaded resins used heretofore for electro stencils, that they are completely homogeneous and non-porous so that the electric conductivity is the same at all points. Accordingly, perforation through electric sparks may produce stencil holes having sharp contours, however small they be. Furthermore, the resins in questions are waterproof so as to be well fit for use with duplicator inks of the emulsion type.
  • FIG. 1 is an enlarged section view of one form of stencil blank in accordance with this invention and FIG. 2 is a similar view of another form.
  • the electric conductivities of the stencil sheet constituted by the polyisobutylene sheet and of the backing sheet, respectively, do not appear to be very critical, as long as the conductivity of the backing sheet is greater than that ofthe stencil sheet.
  • a backing sheet of electrically conductive paper instead of a backing sheet of electrically conductive paper, one of usual paper having a conductive coating may, of course, be used, or the stencil sheet may be composed of two bonded resin layers having different conductivities.
  • the stencil sheet 3 consists of a thin paper sheet 4 having a weight of approximately 6- 12 grams per square meter and containing finely dispersed carbon particles, this sheet being coated with a thin film 5 of inherently electrically conductive polyisobutylene.
  • the backing sheet 6 may, as in FIG. 1, consist of electrically conductive paper, or may be provided with an electrically conductive coating.
  • the stencil blanks described may, if desired, be provided with an additional coating of the stencil sheet for color contrast, in order to make the perforations easily visible, such as is known in the art.
  • a stencil blank comprising a stencil sheet capable of being perforated by electric sparks, said sheet being juxtaposed with and fastened to a backing sheet of electrically conductive material, the stencil sheet comprising one or more layers at least one layer of the stencil sheet being formed a homogeneous inherently electrically conductive synthetic resin, and the backing sheet being made of an electrically conductive material.
  • a stencil blank as claimed in claim 1, wherein the r r v r l stencil sheet comprises a thin sheet of paper containing finely dispersed carbon particles and coated with a layer of inherently electrically conductive synthetic resin.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
US651778A 1966-07-11 1967-07-07 Electrostencil Expired - Lifetime US3562003A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK357266AA DK118255B (da) 1966-07-11 1966-07-11 Elektrisk perforerbar stencil.

Publications (1)

Publication Number Publication Date
US3562003A true US3562003A (en) 1971-02-09

Family

ID=8124414

Family Applications (1)

Application Number Title Priority Date Filing Date
US651778A Expired - Lifetime US3562003A (en) 1966-07-11 1967-07-07 Electrostencil

Country Status (9)

Country Link
US (1) US3562003A (de)
AT (1) AT278051B (de)
CH (1) CH477986A (de)
DE (1) DE1623619B1 (de)
DK (1) DK118255B (de)
FI (1) FI47546C (de)
GB (1) GB1187503A (de)
NL (1) NL6709642A (de)
SE (1) SE317090B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900586A (en) * 1972-12-20 1975-08-19 Australia Res Lab Electrostatic duplicating process
US3925698A (en) * 1973-10-12 1975-12-09 Us Army Colloidal semiconductor and method of manufacture
US9627671B2 (en) 2012-03-28 2017-04-18 Sharp Laboratories Of America, Inc. Fabrication method for metal battery electrode with pyrolyzed coating

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014087A (en) * 1978-01-25 1979-08-22 Vickers Ltd Blank for conversion into a perforated stencil by spark erosion
GB2205275B (en) * 1981-08-11 1989-06-28 Plessey Co Ltd Composite materials.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT141074B (de) * 1933-01-03 1935-03-25 Wilhelm Koreska Schreibunterlage zur Aufzeichnung gesteuerter Funkenentladungen.
DE1030674B (de) * 1955-04-06 1958-05-22 Renker Belipa G M B H Verfahren zur Herstellung eines Funken-Registrierpapiers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900586A (en) * 1972-12-20 1975-08-19 Australia Res Lab Electrostatic duplicating process
US3925698A (en) * 1973-10-12 1975-12-09 Us Army Colloidal semiconductor and method of manufacture
US9627671B2 (en) 2012-03-28 2017-04-18 Sharp Laboratories Of America, Inc. Fabrication method for metal battery electrode with pyrolyzed coating

Also Published As

Publication number Publication date
NL6709642A (de) 1968-01-12
GB1187503A (en) 1970-04-08
DK118255B (da) 1970-07-27
AT278051B (de) 1970-01-26
DE1623619B1 (de) 1972-03-23
CH477986A (de) 1969-09-15
SE317090B (de) 1969-11-10
FI47546B (de) 1973-10-01
FI47546C (fi) 1974-01-10

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