US3067673A - Stencil sheet assembly including top film - Google Patents

Stencil sheet assembly including top film Download PDF

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US3067673A
US3067673A US79918759A US3067673A US 3067673 A US3067673 A US 3067673A US 79918759 A US79918759 A US 79918759A US 3067673 A US3067673 A US 3067673A
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stencil
stencil sheet
coating
top film
film
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Bror E Anderson
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AB Dick Co
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AB Dick Co
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    • 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
    • B41N1/242—Backing sheets; Top sheets; Intercalated sheets, e.g. cushion sheets; Release layers or coatings; Means to obtain a contrasting image, e.g. with a carbon sheet or coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • 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
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • 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]
    • Y10T428/31826—Of natural rubber
    • Y10T428/31833—Next to aldehyde or ketone condensation product or addition polymer from unsaturated monomers
    • 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
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer

Definitions

  • FIG 2 FIG. 5
  • This invention relates to a stencil sheet assembly and more particularly to a top film used as a component thereof in the preparation of an image master for multiple copy work.
  • FIGURE 1 is a perspective view in section of a stencil sheet assembly embodying the features of this invention
  • FIGURE 2 is a perspective view in section of a top film which may be used in the stencil sheet assembly of FIGURE 1;
  • FIGURE 3 is a perspective view in section similar to that of FIGURE 2 showing a modification in the construction of the top film.
  • Stencil duplication constitutes one of the techniques used for the production of multiple copies, preferably in office copy work.
  • stencil duplication use is made of a stencil sheet in which the image to be reproduced upon the copy sheets is outlined in the stencil as stencil openings through which ink may pass.
  • ink can be forced through the stencil openings onto the surfaces of the copy sheet brought into contacting relation therewith to produce copies.
  • the stencil sheet comprises a base sheet of long fibers, such as abaca pulp, interfelted in an open mesh pattern for enabling the passage of ink thereto while permitting the fibers to extend across the stencil openings as a web to strengthen the sheet and to maintain the loop letters.
  • the open mesh base sheet embodies a continuous layer of an ink-impervious material which is capable of displacement responsive to applied impact or pressure.
  • a suitable stencil coating may be formulated of a nitrocellulose base softened with a substantial amount of a plasticizer or oil.
  • Other systems are well known but the foregoing may be taken as representative.
  • the ink-impervious material is displaced in the base sheet to expose the fibers which remain as a network or web across the stencil opening that is formed and through which ink may pass.
  • top film adapted to overlie the stencil during the application of force to produce the desired stencil openings.
  • the top film interposed between the typewriter keys and the coated stencil sheet prevents displacement of coating onto the keys of the typewriter, otherwise the keys would become filled and incapable of use.
  • the top film uniformly distributes the force of the stylus, typewriter key, or die to protect the fibers against breakage whereby the loop letters are retained and more uniform and complete copy is secured.
  • top film which is characterized by elasticity sufficient to enable deformation for transmission of the image responsive to the application of force thereby to eifect displacement of the ink-impervious coating.
  • the top film should also be characterized by strength sufficient to resist rupture for protection of underlying exposed fiber of the stencil base sheet and resilience sufficient for return of the displaced portion of the top film to enable additional use to be made thereof.
  • These characteristics are present in such thin films as are formed of rubber hydrochloride (Pliofilm), polyolefins, such as polyethylene or polypropylene, polyvinylidine chloride copolymers, polyesters (nylon) and the like.
  • Use can be made of other film forming resinous or polymeric materials or papers coated or laminated with such resinous or film forming materials.
  • top film such as is formed of chlorinated rubber
  • a grease-proof interleaver sheet between the coated stencil sheet and the top film to protect the top film from wrinkling due to the absorption of oils and from adhesion to the coated stencil.
  • the use of interleaver sheet of the type described is most undesirable from the standpoint of the cost of the sheet, the need for additional collating equipment for incorporation of the additional sheet in the stencil sheet assembly, and the necessity for removal of the interleaver upon completion of the stencilization process and before the stencilized sheet is mounted on the ink cylinder for the production of multiple copies.
  • the top film 10 is coated on at least the surface adjacent the coated stencil with a resinous or polymeric material 12 which is unaffected by the oils or plasticizers present in the coating composition on the stencil base tissue 14.
  • the top film comprises a rubber hydrochloride
  • the coating 12 may be formulated of an unplasticized polyvinylchloride, polyvinylidine chloride or mixes thereof.
  • other oil or greaseproof materials may be used as a protective coating on the rubber hydrochloride, polyolefin or other top film formed of materials which are caused to be wrinkled or softened by the oils or plasticizers present in the stencil coating.
  • the protective coating 12 can be applied to both sides of the top film, as illustrated by the numerals 12 and 12A in FIGURE 3 of the drawing. The latter is desirable when the stencils are packaged in a manner to bring the top film 10 in surface contact with a coated backing sheet 16 or the coated back side of the stencil 14.
  • the protective coating can be applied in coating weights of from 1 to 2 pounds per 3,000 square feet of surface but best results are secured when the coating weight is within the range 01 1.2 to 1.5 pounds per 3,000 square feet of surface area
  • Application of the protective coating may be made from an organosol or aquasol of the particular resinous material or may be made from solvent solutions or aqueous dispersions containing the resinous material in concentrations less than 100% by weight.
  • the coating composition can be applied by conventional coating means, including spray coating, roller coating, dip coating, by an air coater or the like. Application of the coating composition in the described coating weight is followed either by air drying or by drying in an air-circulating oven at intermediate temperature.
  • the protective layer 12 may be incorporated in the form of a film laminated onto one or both sides of the top film of chlorinated rubber, polyethylene, polypropylene or other polyolefin top film.
  • the following are representative of coating compositions which may be employed in the treatment of the top film to produce the desired coated film.
  • the top film comprises a thin pliable base film of a synthetic polymeric material which is affected by the plasticizers and oils in the coating of the stencil sheet and a thin layer on the surface of the base film adjacent the coated stencil and formed of a synthetic polymeric film forming material which is unafiected by the oils and plasticizerspresent in the coating of the stencil sheet, said synthetic polymeric material of the base film being selected from the group consisting of rubber hydrochloride, polyethylene and polypropylene, said synthetic polymeric film forming material of the coating being selected from a group consisting of unplasticized polyvinyl chloride, polyvinylidene chloride and mixtures thereof and copolymers thereof.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Laminated Bodies (AREA)

Description

Dec. 11, 1962 B. E. ANDERSON STENCIL SHEET ASSEMBLY INCLUDING TOP FILM Filed March 13, 1959 FIG. 1
FIG 2 FIG, 5
INVENT Eror 5.1417416! 2 QM ZZMWYM United States Patent 3,067,673 STENCIL SHEET ASSEMBLY INCLUDING TOP FILM Bror E. Anderson, Wyomissing, Pa., assignor to A. B. Dick Company, Niles, 111., a corporation of Illinois Filed Mar. 13, 1959, Ser. No. 799,187 4 Claims. (Cl. 101-128.2)
This invention relates to a stencil sheet assembly and more particularly to a top film used as a component thereof in the preparation of an image master for multiple copy work.
It is an object of this invention to produce and to provide a method for producing a stencil sheet assembly embodying improved characteristics for the preparation of copy and it is a related object to produce a new and improved top film for use in the stencil sheet assembly in the preparation of a stencil copy therefrom.
These and other objects and advantages of this inven tion will hereinafter appear and, for purposes of illustration, but not of limitation, an embodiment of the invention is shOWn in the accompanying drawings, in which- FIGURE 1 is a perspective view in section of a stencil sheet assembly embodying the features of this invention;
FIGURE 2 is a perspective view in section of a top film which may be used in the stencil sheet assembly of FIGURE 1; and
FIGURE 3 is a perspective view in section similar to that of FIGURE 2 showing a modification in the construction of the top film.
Stencil duplication constitutes one of the techniques used for the production of multiple copies, preferably in office copy work. In stencil duplication, use is made of a stencil sheet in which the image to be reproduced upon the copy sheets is outlined in the stencil as stencil openings through which ink may pass. Thus, when the prepared stencil is mounted upon an ink cylinder of a rotary duplicating machine, as in the conventional manner, ink can be forced through the stencil openings onto the surfaces of the copy sheet brought into contacting relation therewith to produce copies.
Stencil sheets capable of use in multiple copy process of the type described are well known. In its most common form, the stencil sheet comprises a base sheet of long fibers, such as abaca pulp, interfelted in an open mesh pattern for enabling the passage of ink thereto while permitting the fibers to extend across the stencil openings as a web to strengthen the sheet and to maintain the loop letters. The open mesh base sheet embodies a continuous layer of an ink-impervious material which is capable of displacement responsive to applied impact or pressure. Such materials applied onto the base sheet, as by impregnation or coating, are well known to the art as represented by the following issued United States patents and application:
US. Patent No. 2,693,426
US. Patent No. 2,732,795
US. patent application Ser. No. 719,442, filed March Briefly described, a suitable stencil coating may be formulated of a nitrocellulose base softened with a substantial amount of a plasticizer or oil. Other systems are well known but the foregoing may be taken as representative.
In response to the application of force, as by means of a writing stylus, typewriter key, die impression or the like, the ink-impervious material is displaced in the base sheet to expose the fibers which remain as a network or web across the stencil opening that is formed and through which ink may pass.
As developed in earlier investigations and as later described in Heath Patent No. 2,203,280, there are a number of difficulties arising in some of the means of stencilization which can be effectively overcome by the use of a top film adapted to overlie the stencil during the application of force to produce the desired stencil openings. For example, the top film interposed between the typewriter keys and the coated stencil sheet prevents displacement of coating onto the keys of the typewriter, otherwise the keys would become filled and incapable of use. The top film uniformly distributes the force of the stylus, typewriter key, or die to protect the fibers against breakage whereby the loop letters are retained and more uniform and complete copy is secured.
For such purposes, it has been desirable to make use of a top film which is characterized by elasticity sufficient to enable deformation for transmission of the image responsive to the application of force thereby to eifect displacement of the ink-impervious coating. The top film should also be characterized by strength sufficient to resist rupture for protection of underlying exposed fiber of the stencil base sheet and resilience sufficient for return of the displaced portion of the top film to enable additional use to be made thereof. These characteristics are present in such thin films as are formed of rubber hydrochloride (Pliofilm), polyolefins, such as polyethylene or polypropylene, polyvinylidine chloride copolymers, polyesters (nylon) and the like. Use can be made of other film forming resinous or polymeric materials or papers coated or laminated with such resinous or film forming materials.
When the top film, such as is formed of chlorinated rubber, is packaged in a stencil sheet assembly, it has been necessary to insert a grease-proof interleaver sheet between the coated stencil sheet and the top film to protect the top film from wrinkling due to the absorption of oils and from adhesion to the coated stencil. The use of interleaver sheet of the type described is most undesirable from the standpoint of the cost of the sheet, the need for additional collating equipment for incorporation of the additional sheet in the stencil sheet assembly, and the necessity for removal of the interleaver upon completion of the stencilization process and before the stencilized sheet is mounted on the ink cylinder for the production of multiple copies.
It has been found that the described interleaver sheet can be completely eliminated when, in accordance with the practice of this invention, the top film 10 is coated on at least the surface adjacent the coated stencil with a resinous or polymeric material 12 which is unaffected by the oils or plasticizers present in the coating composition on the stencil base tissue 14. When, for example, the top film comprises a rubber hydrochloride, the coating 12 may be formulated of an unplasticized polyvinylchloride, polyvinylidine chloride or mixes thereof. Similarly other oil or greaseproof materials may be used as a protective coating on the rubber hydrochloride, polyolefin or other top film formed of materials which are caused to be wrinkled or softened by the oils or plasticizers present in the stencil coating.
While it is sufficient to provide the protective coating 12 on the stencil sheet side of the top film 10 in the stencil sheet assembly, it will be understood that the protective coating can be applied to both sides of the top film, as illustrated by the numerals 12 and 12A in FIGURE 3 of the drawing. The latter is desirable when the stencils are packaged in a manner to bring the top film 10 in surface contact with a coated backing sheet 16 or the coated back side of the stencil 14. The protective coating can be applied in coating weights of from 1 to 2 pounds per 3,000 square feet of surface but best results are secured when the coating weight is within the range 01 1.2 to 1.5 pounds per 3,000 square feet of surface area Application of the protective coating may be made from an organosol or aquasol of the particular resinous material or may be made from solvent solutions or aqueous dispersions containing the resinous material in concentrations less than 100% by weight. The coating composition can be applied by conventional coating means, including spray coating, roller coating, dip coating, by an air coater or the like. Application of the coating composition in the described coating weight is followed either by air drying or by drying in an air-circulating oven at intermediate temperature. Instead of applying the resinous protective agent by way of a coating composition, the protective layer 12 may be incorporated in the form of a film laminated onto one or both sides of the top film of chlorinated rubber, polyethylene, polypropylene or other polyolefin top film. The following are representative of coating compositions which may be employed in the treatment of the top film to produce the desired coated film.
COMPOSITIONS Example 1 10% polyvinylidine chloride 90% methyl ethyl ketone Example 2 15% polyvinyl chloride 85% methyl ethyl ketone Example 3 14% vinylidine chloride-vinyl chloride copolymer 86% methyl ethyl ketone It Will be understood that the concept of this invention may be practiced by the application of a protective coating onto the top film wherein the protective coating is formulated of other suitable materials which are film forming in character and which are inert to the ingredients present in the coated stencil. Additional changes may be made from the standpoint of formulation and application without departing from the spirit of the invention as especially defined in the following claims.
I claim:
1. In a stencil sheet assembly embodying a coated I stencil sheet and a top film for use in combination with the coated stencil sheet, the improvement wherein the top film comprises a thin pliable base film of a synthetic polymeric material which is affected by the plasticizers and oils in the coating of the stencil sheet and a thin layer on the surface of the base film adjacent the coated stencil and formed of a synthetic polymeric film forming material which is unafiected by the oils and plasticizerspresent in the coating of the stencil sheet, said synthetic polymeric material of the base film being selected from the group consisting of rubber hydrochloride, polyethylene and polypropylene, said synthetic polymeric film forming material of the coating being selected from a group consisting of unplasticized polyvinyl chloride, polyvinylidene chloride and mixtures thereof and copolymers thereof.
2. A stencil sheet assembly as claimed in claim 1 in which the protective layer is present on both sides of the base film.
3. A stencil sheet assembly as claimed in claim 1 in which the protective layer comprises a thin film of the synthetic polymeric material Which is laminated to the top film.
4. A stencil sheet assembly as claimed in claim 1 in which the protective layer comprises a coating on the top film present in coating weights of from 1 to 2 pounds per 3,000 square feet of surface area.
References Cited in the file of this patent UNITED STATES PATENTS 2,203,280 Heath June 4, 1940 2,234,611 Trumbull Mar. 11, 194-1 2,328,844 Osterhof Sept. 7, 1943 2,386,700 Manchester Oct. 5, 1945 2,400,390 Clunan May 14, 1946 2,575,581 Carson Nov. 20, 1951 2,679,969 Richter June 1, 1954 2,721,513 Marron Oct. 25, 955 2,786,783 Hahn et al. Mar. 26, 1957 2,840,491 Grenley et a1. June 24, 1958 2,919,059 Sporka Dec. 29, 1959

Claims (1)

1. IN A STENCIL SHEET ASSEMBLY EMBODYING A COATED STENCIL SHEET AND A TOP FILM FOR USE IN COMBINATION WITH THE COATED STENCIL SHEET, THE IMPROVEMENT WHEREIN THE TOP FILM COMPRISES A THIN PLIABLE BASE FILM OF A SYNTHETIC POLYMERIC MATERIAL WHICH IS AFFECTED BY THE PLASTICIZERS AND OILS IN THE COATING OF THE STENCIL SHEET AND A THIN LAYER ON THE SURFACE OF THE BASE FILM ADJACENT THE COATED STENCIL AND FORMED OF A SYNTHETIC POLYMERIC FILM FORMING MATERIAL WHICH IS UNAFFECTED BY THE OILS AND PLASTIZERS PRESENT IN THE COATING OF THE STENCIL SHEET, SAID SYNTHETIC POLYMERIC MATERIAL OF THE BASE FILM BEING SELECTED FROM THE GROUP CONSISTING OF RUBBER HYDROCHLORIDE, POLYETHYLENE AND POLYPROPYLENE, SAID SYNTHETIC POLYMERIC FILM FORMING MATERIAL OF THE COATING BEING SELECTED FORM A GROUP CONSISTING OF UNPLASTICIZED POLYVINYL CHLORIDE, POLYVINYLIDENE CHLORIDE AND MIXTURES THEREOF AND COPOLYMERS THEREOF.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236675A (en) * 1961-03-17 1966-02-22 Montedison Spa Heat-sealable, coated polypropylene films
US3270666A (en) * 1964-09-08 1966-09-06 Mark Fast Marking System Inc Stencil with barrier layer between the stencil and the adhesive
US3929068A (en) * 1973-12-17 1975-12-30 Jones & Co Ltd Samuel Stencils
US5149577A (en) * 1991-01-07 1992-09-22 Mallace Industries Corporation Dual purpose stencil-forming sheet containing a red pigment

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203280A (en) * 1939-09-05 1940-06-04 Almon A Heath Stencil film
US2234611A (en) * 1937-01-12 1941-03-11 Goodrich Co B F Composite product and method of making the same
US2328844A (en) * 1941-09-29 1943-09-07 Wingfoot Corp Coated rubber hydrochloride film
US2386700A (en) * 1943-11-20 1945-10-09 Wingfoot Corp Coated paper
US2400390A (en) * 1941-07-30 1946-05-14 Wingfoot Corp Package
US2575581A (en) * 1949-04-20 1951-11-20 Wingfoot Corp Coated rubber hydrochloride film
US2679969A (en) * 1954-01-12 1954-06-01 Transparent Package Company Package construction
US2721513A (en) * 1951-02-02 1955-10-25 Dick Co Ab Top film for stencil sheet assembly
US2786783A (en) * 1956-05-25 1957-03-26 Dow Chemical Co Coating process for polyethylene and composite articles thereby obtained
US2840491A (en) * 1956-09-04 1958-06-24 Dow Chemical Co Method for coating polyethylene with haloethylene polymers and composite articles thereby obtained
US2919059A (en) * 1954-10-26 1959-12-29 Tee Pak Inc Production of packages

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234611A (en) * 1937-01-12 1941-03-11 Goodrich Co B F Composite product and method of making the same
US2203280A (en) * 1939-09-05 1940-06-04 Almon A Heath Stencil film
US2400390A (en) * 1941-07-30 1946-05-14 Wingfoot Corp Package
US2328844A (en) * 1941-09-29 1943-09-07 Wingfoot Corp Coated rubber hydrochloride film
US2386700A (en) * 1943-11-20 1945-10-09 Wingfoot Corp Coated paper
US2575581A (en) * 1949-04-20 1951-11-20 Wingfoot Corp Coated rubber hydrochloride film
US2721513A (en) * 1951-02-02 1955-10-25 Dick Co Ab Top film for stencil sheet assembly
US2679969A (en) * 1954-01-12 1954-06-01 Transparent Package Company Package construction
US2919059A (en) * 1954-10-26 1959-12-29 Tee Pak Inc Production of packages
US2786783A (en) * 1956-05-25 1957-03-26 Dow Chemical Co Coating process for polyethylene and composite articles thereby obtained
US2840491A (en) * 1956-09-04 1958-06-24 Dow Chemical Co Method for coating polyethylene with haloethylene polymers and composite articles thereby obtained

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236675A (en) * 1961-03-17 1966-02-22 Montedison Spa Heat-sealable, coated polypropylene films
US3270666A (en) * 1964-09-08 1966-09-06 Mark Fast Marking System Inc Stencil with barrier layer between the stencil and the adhesive
US3929068A (en) * 1973-12-17 1975-12-30 Jones & Co Ltd Samuel Stencils
US5149577A (en) * 1991-01-07 1992-09-22 Mallace Industries Corporation Dual purpose stencil-forming sheet containing a red pigment

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