EP0670227A1 - Stencil for printing sheet and process for stencil-making the same - Google Patents

Stencil for printing sheet and process for stencil-making the same Download PDF

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Publication number
EP0670227A1
EP0670227A1 EP95301241A EP95301241A EP0670227A1 EP 0670227 A1 EP0670227 A1 EP 0670227A1 EP 95301241 A EP95301241 A EP 95301241A EP 95301241 A EP95301241 A EP 95301241A EP 0670227 A1 EP0670227 A1 EP 0670227A1
Authority
EP
European Patent Office
Prior art keywords
solvent
stencil
resin film
stencil printing
printing 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.)
Withdrawn
Application number
EP95301241A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hideo C/O Riso Kagaku Corp. Watanabe
Sadanao C/O Riso Kagaku Corp. Okuda
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.)
Riso Kagaku Corp
Original Assignee
Riso Kagaku Corp
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 Riso Kagaku Corp filed Critical Riso Kagaku Corp
Publication of EP0670227A1 publication Critical patent/EP0670227A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/147—Forme preparation for stencil-printing or silk-screen printing by imagewise deposition of a liquid, e.g. from an ink jet; Chemical perforation by the hardening or solubilizing of the ink impervious coating or sheet

Definitions

  • the present invention relates to a stencil printing sheet and a method for stencil-making the same. Specifically, it relates to a stencil printing sheet having a solvent-soluble resin layer and its stencil-making method.
  • a heat-sensitive stencil sheet As a stencil printing sheet, a heat-sensitive stencil sheet has been conventionally been known which is obtained by superposing a thermoplastic resin film on a porous substrate and adhering to each other.
  • methods for preparing a heat-sensitive stencil sheet there have been known the following methods, for example, (1) a method for stencil-making by using a heat-generating device of a flush lamp, infrared lamp or others, superposing a hand-written manuscript or preliminarily prepared manuscript on a heat-sensitive sheet, and melting and perforating a thermoplastic resin film by the generated heat from the device described above, (2) a method for stencil-making by using a thermal head for generating a letter image information converted into an electric signal as a dotting heat, bringing a heat-sensitive stencil sheet in contact with the thermal head, and melting and perforating the thermoplastic resin film.
  • an aim of the present invention to solve the above-mentioned problems in the prior art and provide such a heat-sensitive stencil sheet and a sheet-making method thereof as to be thereby produced easily and in a low cost, and generate no problems at a time of stencil-making as well.
  • the present invention provides a stencil printing sheet which comprises a porous substrate and a solvent-soluble resin film laminated thereon wherein the solvent-soluble resin film contains an acetalized polyvinyl alcohol at an acetalization degree of 1 - 70 mol%.
  • the present invention also provides a process for stencil-making of a stencil printing sheet consisting of a porous substrate and a solvent-soluble resin film laminated thereon, which comprises perforating the stencil printing sheet by dissolving the solvent-soluble resin film with a mixed solvent of water and an alcohol type solvent.
  • the solvent-soluble resin film in the present invention contains an acetalized polyvinyl alcohol at an acetalization degree of 1 - 70 mol%, preferably 3 - 50 mol%, as a main component. If the degree of acetalization in polyvinyl alcohol is less than 1 mol%, the stencil printing sheet is inferior in its water resisting property, and if it exceeds 70 mol%, the stencil printing sheet is reduced in oil resistance. Since it contains such an acetalized polyvinyl alcohol as a main component, ink resisting property of the stencil printing sheet to water-soluble ink, oily ink, emulsion ink and other is improved.
  • R represents a hydrogen atom or alkyl group
  • 1 is defined in the range of 1 - 70 mol%
  • m is defined preferably in the range of 1 - 10 mol%
  • n is defined preferably in the range of 1 - 90 mol%, respectively.
  • the ratios of 1, m and n are appropriately chosen depending upon the flexibility of the resin film, its compatibilities to other resins, its solubilities into other solvents, and so forth.
  • the solvent-soluble resin film can contain besides the acetalized polyvinyl alcohol described above, a thermoplastic resin or thermosetting resin soluble in a solvent, such as water or an organic solvent as well, so long as the water resisting property and oil resistance thereof at a time of printing are not prevented.
  • an organic solvent-soluble resin there is exemplified polyethylene, polypropylene, polyisobutylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinyl acetate, acryl resin, polyacrylonitrile, polyamide, polyimide, petroleum resin, phenolic resin, amino resin, expoxy resin, polyester, polycarbonate, polyurethane, polysulfone, silicone resin, alkyd resin, melamine resin or the like.
  • These resins may be used independently, in a form of an admixture of a plurality of resins or in a form of a copolymer of their monomers as well.
  • a water-soluble resin a resin soluble in water or in a water-miscible solvent
  • methyl cellulose carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrolidone, polyethylene-polyvinyl alcohol copolymer, polyethylene oxide, polyvinyl ether, polyacrylamide, starch, dextrin, alginic acid, ascorbic acid, water-base urethane or the like.
  • These resins may be used independently, in an admixture of a plurality of resins, or in a form of a copolymer of their monomers as well.
  • dyestuffs, pigments, fillers, binders and curing agents can be contained in the solvent-soluble resin film in addition to the resin components described above.
  • the thickness of the solvent-soluble resin film is usually in the range of 0.1 - 100 ⁇ m, and preferably, in the range of 1 - 50 ⁇ m, from the standpoints of strength of the resin film and perforation ability thereof depending upon a solvent.
  • porous substrate used in the present invention there is exemplified Japanese paper and fibers cloth using natural fibers such as Manila hemp, pulp, Mitsumata (Edgeworthia papyrifera Sieb.), Kozo (Broussonetia kazinoki Sieb.), synthetic fibers, such as that of polyester, nylon, vinylon, acetate fiber or the like, a thin leaf paper using metallic fiber, glass fiber, non-woven cloth or the like.
  • These porous substrates can be independently or in the combination of two or more kinds thereof.
  • Each basis weight of these porous substrate is usually, in the range of 1 - 20 g/m2 and preferably, in the range of 5 - 15 g/m2, from the standpoints of the strength of the paper and the permeability of the ink.
  • the thickness of the porous substrate is usually, in the range of 5 - 100 ⁇ m, and preferably, in the range of 10 - 50 ⁇ m, from the standpoints of the strength of the paper and the permeability of the ink.
  • the stencil printing sheet of the present invention is comprised by laminating a solvent-soluble resin film on a porous substrate.
  • the stencil printing sheet of the present invention can be produced by e.g., a process (1) for laminating a solvent-soluble resin film to a porous substrate with an adhesive or sticking agent, a process (2) for applying a heat-adhesion to a resin film and a porous substrate, a process (3) for coating a resin solution dissolved or dispersed into a solvent on a porous substrate and then drying the same, a process (4) for coating a solvent or dispersed resin solution on a separating substrate and drying to form a resin film, superposing a porous substrate on the formed resin film and peeling off the separating substrate, and other processes.
  • Organic solvents in addition to water or alcohol type solvent, can be used and properly chosen depending upon the drying property, working property, coating property and others when the stencil printing sheet is produced.
  • a stencil printing sheet of the present invention has a solvent-soluble resin film
  • the resin film in the contacted portion starts dissolving into the solvent and then, the resin film dissolves in the solvent up to its saturation in solubility.
  • the solution which dissolved the resin film permeates into the interior of the porous substrate and the resin film corresponding to of this portion is perforated. Since the solution which dissolved the resin film permeates into the porous substrate, the dissolved component is not left in the perforated portion of the resin film and does not obstruct the perforation.
  • the perforating property of the resin film can be adjusted by controlling the solubility of the solvent to the resin film and the quantity of the contacting solvent.
  • a mixed solvent containing water and an alcohol type solvent is used as a main component.
  • a solvent such as monohydric alcohol, polyhydric alcohol, aliphatic saturated or unsaturated alcohol, alicyclic alcohol, aromatic alcohol, heterocyclic alcohol or the like are used.
  • methyl alcohol ethyl alcohol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, isoamyl alcohol, hexyl alcohol, octyl alcohol, decyl alcohol, stearyl alcohol, allyl alcohol, cyclohexanol, benzyl alcohol, furfuryl alcohol, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, ethylene chlorohydrin, carbitol, glycerine, hydrobenzoin, benzpinacol, cyclopentane-1,2-diol or the like.
  • the above-mentioned mixed solvent with water may also contain other organic solvents, such as those of aliphatic hydrocarbon type, aromatic hydrocarbon type, ketone type, ester type, ether type, aldehyde type, carboxylic acid type, fatty ester type, amine type, low molecular heterocyclic compounds, oxide type and the like.
  • organic solvents such as those of aliphatic hydrocarbon type, aromatic hydrocarbon type, ketone type, ester type, ether type, aldehyde type, carboxylic acid type, fatty ester type, amine type, low molecular heterocyclic compounds, oxide type and the like.
  • hexane, heptane, octane, benzene, toluene, xylene, acetone, methyl ethyl ketone, ethyl acetate, propyl acetate, ethyl ether, tetrahydrofuran, 1,4-dioxane, formic acid, acetic acid, propionic acid, formaldehyde, acetaldehyde, methylamine, ethylenediamine, dimethylformamide, pyridine, ethylene oxides and others are exemplified.
  • these solvents may contain dyestuffs, pigments, fillers, binders, hardeners, antiseptics, swelling agents, surfactants, pH controllers and others, if necessary.
  • the stencil-making of the stencil sheet of the present invention may be carried out by bringing a means, such as a brush pen impregnated with a water base solvent, in contact with a resin film directly soluble in the water base solvent, but it is preferable to stencil-make by supplying the water base solvent to the resin film in a non-contact condition by an ejecting device of the water base solvent so as to perforate it.
  • a means such as a brush pen impregnated with a water base solvent
  • a solvent ejecting means there is exemplified such an apparatus that a nozzle, a slit, an injector, a porous material, a porous film or the like is connected to a liquid feed pump, a piezoelectric element or heating element so as to eject the solvent intermittently or continuously, in a dot or in a line form corresponding to each letter and picture image signal.
  • the stencil printing sheet of the invention can be produced without need of any separating property, abrasion and mechanical strength of the sheet as required in the conventional heat-sensitive stencil sheet.
  • the stencil printing sheet obtained by the process of the invention can be applied to a general stencil printing process to obtain a printed matter.
  • a printed matter can be obtained by mounting an ink on a perforated stencil printing sheet, passing the ink through each portion perforated by press rolls, reduced pressure means or squeegee rolls and transcribing the ink to a printing paper.
  • the stencil printing sheet of the present invention is exellent in brilliant printed matters, water resisting property and oil resistance can be obtained even in use of any type of ink, such an oily ink usually used in stencil printing, water-base ink, water-in-oil emulsion ink, oil-in-water emulsion ink, and others, by using such a printing ink as used in a conventional printing as an oily ink, a water-base ink, an oil-in-water (W/O) type emulsion ink, a water-in-oil (O/W) type emulsion ink and others can be used.
  • any type of ink such an oily ink usually used in stencil printing, water-base ink, water-in-oil emulsion ink, oil-in-water emulsion ink, and others.
  • reference characters 1 to 19 means the following:
  • a polyester fiber cloth having a sieve opening of 280 mesh was immersed in a resin solution consisting of the following resin composition, picked up from it and dried off. Then, a resin film of 3 ⁇ m in thickness was provided in the gap of the mesh to give a stencil sheet.
  • Butyral resin 10 parts by weight polyvinyl alcohol having a butyralization degree of 40 mol%)
  • aqueous solution consisting of the following composition was ejected in a letter shape to the stencil printing sheet described above from an ejecting means provided with a nozzle of 8 dots/mm and a piezoelectric element connected thereto, and the polyvinyl alcohol film at the ejected portion was dissolved and perforated.
  • Ethyl alcohol 50 parts by weight Ethylene glycol 10 parts by weight
  • a black ink (HI-MESH, trademark of Riso Kagaku Corporation) for use in a portable stencil printing device, PRINT GOKKO (trademark of RISO Kagaku Corporation) was mounted on the side of the polyester fiber cloth of the engraved stencil printing sheet, and the other side was superposed on a printing sheet to carry out printing by squeeging the ink by a blade, resulting in printing brilliantly the similar letters to those of the perforated portions.
  • FIG. 1 shows a sectional model view of a stencil printing sheet obtained in Example 1, in which (A) shows a sectional model view of a polyester fiber cloth 1, (B) shows a sectional model view of a stencil printing sheet 4 forming a solvent-soluble resin film 2 on a polyester fiber 3, and (C) shows a perspective view illustrating a stencil printing sheet 4 in a model form, respectively.
  • FIG. 2 is an explanatory view showing a perforation of a stencil printing sheet.
  • A of FIG. 2 is a model view showing stencil-making and once solvents 5 and 6 are ejected from a solvent ejection means 9 and the ejected solvent is brought into contact with the surface of the stencil printing sheet 4, the solvent-soluble resin film at the contacted portion is dissolved and perforated.
  • 7 represents a resin solution which dissolved the resin film and adhered to the polyester fiber cloth
  • 8 represents a perforated portion of the resin film, respectively.
  • B of FIG. 2 is a perspective view showing a perforated stencil printing sheet in a model form.
  • a resin solution consisting of the following composition was coated by a roll coater on a separating paper treated with silicone and dried off to obtain a solvent-soluble resin film of 3 ⁇ m in thickness thereon.
  • Formal resin 10 parts by weight Polyvinyl alcohol having a formalization degree of 20 mol%)
  • Methyl ethyl ketone 30 parts by weight
  • Isopropyl alcohol 50 parts by weight 1,4-dioxane 10 parts by weight
  • a mixed solvent having the following composition was ejected in a letter shape on the surface of the resin film of this stencil printing sheet from the similar means as shown in Example 1 and the resin film in the ejected portions was dissolved to perforate the stencil printing sheet, resulting in stencil-making.
  • a resin solution consisting of the following composition was coated by a roll coater on a polyester sheet of 30 ⁇ m in thickness and dried off to obtain a solvent-soluble resin film of 2 ⁇ m in thickness thereon.
  • Formal resin 10 parts by weight Polyvinyl alcohol having a formalization degree of 10 mol%) Tetrahydrofuran 20 parts by weight Isopropyl alcohol 30 parts by weight Water 40 parts by weight
  • an adhesive solution consisting of the following composition was coated with the similar adhesive solution to that of Example 2 on a Japanese paper having a basis weight of 12 g/m2 and dried off. Subsequently, the thus obtained solvent-soluble resin film on the polyester sheet was superposed on the adhesive layer on the Japanese paper and the polyester sheet was peeled off to give a stencil printing sheet.
  • FIG. 3 shows a view of a production process for a stencil printing paper in Example 3.
  • a solvent-soluble resin film 11 is formed on a polyester sheet 12, and in FIG. 3(B), an adhesive or sticking agent layer 14 is formed on a Japanese paper 13.
  • FIG. 3(C) the solvent-soluble resin film 11 and the adhesive or sticking agent are superposed on each other and the polyester sheet 12 on the solvent-soluble resin film 11 is peeled off to give a stencil printing sheet 15.
  • FIG. 4 is an explanatory view showing a perforation of a stencil printing sheet.
  • a solvent 16 is ejected from a solvent ejection means 10 and the ejected solvent is brought in contact with the surface of the stencil printing sheet.
  • the contacting solvent 17 dissolves the resin film at the contacted portion.
  • the dissolved solution 18 permeates into the interior of the Japanese paper and the contacted portion is perforated, resulting in giving a perforated resin film 19.
  • a resin solution consisting of the following composition was coated by a roll coater on a polyethylene film treated with silicone and dried off to obtain a solvent-soluble resin film of 30 ⁇ m in thickness thereon.
  • Formal resin 10 parts by weight Polyvinyl alcohol having a formalization degree of 10 mol%)
  • Acetone 10 parts by weight Ethyl alcohol 50 parts by weight
  • the polyester film was peeled off from the resin film to give a stencil printing sheet.
  • a water-base ink was ejected onto the solvent-soluble film of the above-mentioned stencil printing sheet by a commercially available word processor of an ink jet type, and transited to the solvent-soluble resin film to perforate it.
  • the thus engraved stencil printing sheet was set to the printing drum of a commercial stencil printing machine, RISOGRAPH RC115 (trademark of RISO KAGAKU CORPORATION) and the printing was carried out to give the similar brilliant letters and images to those recorded by the ink jet word processor used in stencil-making.
  • a stencil printing sheet was prepared and a stencil-making was carried out thereon by following the similar procedure to that in Example 1 except that the solvent-soluble resin film in Example 1 was altered to the following resin composition.
  • This engraved stencil printing sheet was printed in the similar manner to that of Example 1. However, the resin film of other areas than the perforated portion started dissolving by the oily component of the ink, resulting in giving unclear printed matters.
  • a stencil printing paper was prepared and a stencil-making was carried out thereon by following the similar procedure to that in Example 4 except altering the solvent-soluble resin film in Example 4 to the following resin composition.
  • This engraved stencil printing sheet was printed in the similar manner to that of Example 4. However, the resin film of other areas than the perforated portion started dissolving by the water component of the ink, resulting in giving unclear printed matters.
  • the stencil printing sheet of the present invention since the stencil printing sheet of the present invention can be perforated by a solvent in its non-contact condition, there is no generation of any wrinkles and the like. Since no residues are left in the perforated portion, brilliant pictures can be obtained. Furthermore, since there is no need of considering the separability, antifriction, mechanical characteristics and the like to the thermal head as a case in the prior art, the resulting production becomes easy and the production cost can be reduced as well. Moreover, the solvent-soluble resin layer has water-resisting property and oil resistant, resulting in providing brilliantly printed matters by an oily ink, water-base ink, emulsion ink or the like.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laminated Bodies (AREA)
EP95301241A 1994-02-28 1995-02-27 Stencil for printing sheet and process for stencil-making the same Withdrawn EP0670227A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP29785/94 1994-02-28
JP2978594A JPH07237367A (ja) 1994-02-28 1994-02-28 孔版印刷用原紙および製版方法

Publications (1)

Publication Number Publication Date
EP0670227A1 true EP0670227A1 (en) 1995-09-06

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EP95301241A Withdrawn EP0670227A1 (en) 1994-02-28 1995-02-27 Stencil for printing sheet and process for stencil-making the same

Country Status (5)

Country Link
EP (1) EP0670227A1 (enrdf_load_stackoverflow)
JP (1) JPH07237367A (enrdf_load_stackoverflow)
KR (1) KR0178407B1 (enrdf_load_stackoverflow)
AU (1) AU680710B2 (enrdf_load_stackoverflow)
TW (1) TW302412B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703090A1 (en) * 1994-09-09 1996-03-27 Riso Kagaku Corporation Stencil printing apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3602452B2 (ja) * 2001-01-19 2004-12-15 理想科学工業株式会社 孔版印刷用原紙ならびにその製造方法および製版方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB255361A (en) * 1925-01-21 1926-07-21 David Gestetner Improvements in and relating to duplicating
GB707160A (en) * 1950-07-28 1954-04-14 Dick Co Ab Improvements in or relating to method for manufacturing stencils
EP0108509A2 (en) * 1982-10-08 1984-05-16 Pilot Man-Nen-Hitsu Kabushiki Kaisha Stencil, stencil material set and stencil duplicator set containing the same
EP0642929A1 (en) * 1993-09-09 1995-03-15 Riso Kagaku Corporation Process for producing stencil printing sheet
EP0642930A1 (en) * 1993-09-09 1995-03-15 Riso Kagaku Corporation Process for producing stencil printing sheet
EP0648615A1 (en) * 1993-10-14 1995-04-19 Riso Kagaku Corporation Stencil printing sheet and process for perforating the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL281492A (enrdf_load_stackoverflow) * 1961-08-07
GB8405549D0 (en) * 1984-03-02 1984-04-04 Sericol Group Ltd Screen printing compositions
DE3644162A1 (de) * 1986-12-23 1988-07-07 Hoechst Ag Polyvinylacetal, dieses enthaltendes lichtempfindliches gemisch und daraus hergestelltes aufzeichnungsmaterial

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB255361A (en) * 1925-01-21 1926-07-21 David Gestetner Improvements in and relating to duplicating
GB707160A (en) * 1950-07-28 1954-04-14 Dick Co Ab Improvements in or relating to method for manufacturing stencils
EP0108509A2 (en) * 1982-10-08 1984-05-16 Pilot Man-Nen-Hitsu Kabushiki Kaisha Stencil, stencil material set and stencil duplicator set containing the same
EP0642929A1 (en) * 1993-09-09 1995-03-15 Riso Kagaku Corporation Process for producing stencil printing sheet
EP0642930A1 (en) * 1993-09-09 1995-03-15 Riso Kagaku Corporation Process for producing stencil printing sheet
EP0648615A1 (en) * 1993-10-14 1995-04-19 Riso Kagaku Corporation Stencil printing sheet and process for perforating the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Encyclopedia of polymer science and technology", JOHN WILEY & SONS *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703090A1 (en) * 1994-09-09 1996-03-27 Riso Kagaku Corporation Stencil printing apparatus

Also Published As

Publication number Publication date
KR0178407B1 (ko) 1999-04-01
TW302412B (enrdf_load_stackoverflow) 1997-04-11
AU1353595A (en) 1995-09-07
AU680710B2 (en) 1997-08-07
JPH07237367A (ja) 1995-09-12

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