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WO1997047471A1 - Procede et appareil de fabrication de timbres en caoutchouc a preencrage - Google Patents

Procede et appareil de fabrication de timbres en caoutchouc a preencrage Download PDF

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Publication number
WO1997047471A1
WO1997047471A1 PCT/EE1997/000002 EE9700002W WO9747471A1 WO 1997047471 A1 WO1997047471 A1 WO 1997047471A1 EE 9700002 W EE9700002 W EE 9700002W WO 9747471 A1 WO9747471 A1 WO 9747471A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing plate
case
printing
blank
supporting body
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.)
Ceased
Application number
PCT/EE1997/000002
Other languages
English (en)
Inventor
Leo-Henn Humal
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU29516/97A priority Critical patent/AU2951697A/en
Publication of WO1997047471A1 publication Critical patent/WO1997047471A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/055—Thermographic processes for producing printing formes, e.g. with a thermal print head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41D—APPARATUS FOR THE MECHANICAL REPRODUCTION OF PRINTING SURFACES FOR STEREOTYPE PRINTING; SHAPING ELASTIC OR DEFORMABLE MATERIAL TO FORM PRINTING SURFACES
    • B41D7/00—Shaping elastic or deformable material, e.g. rubber, plastics material, to form printing surfaces

Definitions

  • the present invention belongs to the sphere of printing industry, more specifically to the manufacture of pre-inkable rubber stamps .
  • thermo-plastic materials have been used, because their surface pores can be closed by heating and simultaneous compressing, in this way producing areas, which are impermeable to stamp ink, and can therefore serve as non-printing elements of a rubber stamp's printing surface.
  • a printing plate is produced which, after it has been filled with ink and mounted into a stamp mount forms a rubber stamp capable of producing a large number (tens of thousands) of imprints with no need for an ink-pad.
  • a method for manufacturing pre-inkable printing plates which consists in selectively closing surface pores of the microporous thermo-plastic material by way of heating and compressing with a heated relief mould (GB patent No. 1112776, B 44 C 1/24, Bankers and Merchants, Inc., 1968, JP patent No. 6024114, b 41 K 1/50, Tokyo Ohka Kogyo Co., Ltd., 1994).
  • a relief master mould is made, which has grooves corresponding to the printing elements of the printing plate being manufactured.
  • the master mould is then heated to the temperature above the melting point of the microporous thermo-plastic material used, after which a sheet of the microporous thermo-plastic material is pressed against the heated mould.
  • the sheet of the microporous thermo-plastic material and the heated mould come into contact and the surface of the sheet of the microporous thermo-plastic material melts and its pores collapse, producing a layer which is impermeable to stamp ink.
  • the surface areas of the microporous thermo-plastic sheet do not melt and remain porous, forming the printing elements.
  • a method for closing the surface pores of a microporous thermo-plastic material selectively, heating it by means of light radiation and simultaneously compressing against a smooth transparent body (EE Patent application P 9500001, AS Humal Elektroonika, 1995). This method presupposes use of a microporous thermo-plastic material with a light absorbing surface.
  • a typesetting pattern is drawn on a transparent or semi-transparent means using a light-absorbing colour. The means is then placed between a transparent smooth-surfaced body and the microporous thermo- plastic material, whereas the typesetting pattern on it is separated from the light-absorbing surface of the microporous thermo-plastic material by at least a 0.02 mm thick separating film.
  • the surface of the microporous thermo-plastic material is exposed to an impulse of light.
  • the heat generated by the light impulse melts the surface and its pores will be closed as a result of the applied pressure, whereas at those areas which correspond to the printing elements the typesetting pattern absorbs the light, causing no heat to operate on the surface of the microporous thermo-plastic material and its pores to remain open. Pressing against a smooth- surfaced body simultaneously with selective heating makes it possible to exert enough pressure to close the pores completely.
  • thermo head having a large number of electrical heating elements on its surface that can be selectively switched on and off by means of a control device, is used for producing a typesetting pattern on the surface of a thermo-plastic material by selectively melting its surface.
  • thermo-plastic printing plates As far as the manufacture of microporous thermo-plastic printing plates, especially according to the last two methods described above, is quite productive, it appears that in the manufacturing process of rubber stamps the most time- consuming stages are inking of the printing plates and mounting them into stamp mounts. Besides that, the mounting of pre-inked printing plates requires use of glues emitting noxious fumes. There is no good solution for re-inking of such rubber stamps either, because the rear surface of the printing plate is glued to the stamp mount and is not quite suitable for re-inking.
  • stamp mount has a case for a printing plate, in the lower opening of which a microporous thermo- plastic printing plate can be mounted by melting along its perimeter, using for this purpose a special melting device.
  • the rear surface of the printing plate is supported by a porous plate and the latter in its turn is supported by a framework filling the upper part of the printing plate's case, forming an ink reservoir.
  • this stamp can easily be refilled with ink through the opening in the upper part of the printing plate's case.
  • the technical solution closest to the invention being described herein was proposed by Yamahachi Chemical.
  • the said company produces stamp mounts for manufacturing rubber stamps from microporous thermo-plastic materials by way of heating with the use of relief master moulds.
  • Their stamp mounts have a printing plate case, into the lower opening of which a blank printing plate made of a microporous thermo- plastic material is mounted by melting along its perimeter.
  • the rear surface of the blank printing plate is supported by a plate from a porous material and the latter in its turn is supported by a framework; the two together forming an ink reservoir.
  • the ink reservoir can be filled with ink through an opening in the upper part of the printing plate's case.
  • This stamp mount is used for manufacturing pre-inkable rubber stamps in the following way.
  • a relief master mould is produced which corresponds to the typesetting pattern required, having grooves in place of the printing elements.
  • the master mould is heated above the melting point of the microporous thermo-plastic material of the blank printing plate.
  • the printing plate's case together with the blank printing plate mounted in it is placed into a special device which presses the surface of the blank printing plate for a short time against the relief mould.
  • the printing surface of the blank printing plate and the heated master mould come in contact with each other, the surface of the printing plate melts and its pores collapse under the pressure of the master mould, producing a layer impermeable to ink.
  • the surface of the blank printing plate does not melt and remains porous, thus forming the printing elements.
  • the method described above will save the stamp manufacturer from having to mount the printing plate and might thus make stamp manufacturing very quick and economical.
  • the difficulty lies in the necessary pre-stage: the manufacture of the relief master mould.
  • How to use the stamp mount described above without a relief mould, for example, selectively heating the surface of the blank printing plate by light radiation or by a thermal head is not known.
  • the porous plate and framework supporting the printing plate in the stamp mount described above are rigid enough to withstand the relatively low pressure exerted selectively by the relief mould, but not to withstand the pressure necessary for totally closing the pores in the non-printing elements when the whole printing surface is pressed against a smooth- surfaced body and selectively heated.
  • the other aim of the present invention is to provide an apparatus for the manufacture of pre-inkable rubber stamps according to the proposed method.
  • the selective closing of the pores of the printing surface can be performed, for example, by selective heating by light radiation or a thermal head, while simultaneously with the selective heating both heated and non-heated elements of the printing surface of the blank printing plate are pressed against a supporting body.
  • a transparent smooth-surfaced body can be used, through which light radiation is selectively conducted to the printing surface of a blank printing plate, or a thermal head can be used for selective heating of the elements of the printing surface.
  • the printing surface of the blank printing plate is pressed against the support body, the pressure being not less than 0.2 MPa.
  • some stamp ink is poured into the printing plate's case, so that it covers the rear surface of the blank printing plate, and the printing plate's case is fixed so that the blank printing plate mounted in it is placed against the said supporting body.
  • the blank printing plate is pressed with its printing surface against the said supporting body by way of creating inside the printing plate's case hydrostatis over ⁇ pressure, e.g. by connecting it to a source or compressed air.
  • the printing plate's case is pressed against the said supporting body by means of a hollow mould supporting the printing plate's case from above and at the sides.
  • An apparatus for the manufacture of pre-inkable rubber stamps which consists of a supporting body, e.g. a glass plate, of a source of impulse light, of a means for fixing the printing plate's case with the printing surface of a blank printing plate against the said supporting body, and of a means for connecting the cavity in the printing plate's case to a source of compressed air.
  • Fig.l printing plate's case together with a blank printing plate, glued or melted by its perimeter into it Fig.2 - realization of the method Fig.3 - placement of the light absorbing pattern Fig.4 - forming of the printing plate
  • a printing plate's case which consists of a plastic shell 1, a blank printing plate 2 glued or melted to the latter by its perimeter, and a plate 3 that supports the blank printing plate and either has penetrating holes in it or is made of some porous material.
  • the printing plate's case has an opening 4, which can be closed by a plug or cover.
  • the microporous material of the blank printing plate should be light absorbing by nature , if not, then the printing surface should be made light absorbing by application of a suitable dye or pigment.
  • the manufacturing process of the rubber stamp is performed as follows (Fig. 2, 3, and 4).
  • a transparent means 7 is placed which has on it a light absorbing pattern of typesetting 8 , covered by a transparent separating film 9.
  • the printing plate's case of the design described above is placed, with the printing surface of the blank printing plate in contact with the separating film 9.
  • the printing plate's case is fixed by a mould 10 to avoid its shifting from the glass plate 6 or outward deformation.
  • some stamp ink 11 is poured into the porous plate 3 through the opening 4.
  • the stamp ink 11 reaches the rear surface of the blank printing plate and covers the pores on its surface. Now the cavity of the printing plate's case is connected via the opening 4 to a source of compressed air.
  • the blank printing plate is converted into a printing plate 15 having both printing and non-printing elements (Fig.4) on it. After exposure the printing plate's case is disconnected from the source of compressed air and detached from the glass plate 6. After some time the stamp ink will sink into the printing plate 15, filling its pores and reaching the printing surface 5.
  • the elements of the printing surface that during the exposure were covered by the light absorbing elements 8 now form printing elements, whereas the elements without light absorbing elements 8 are now covered with a melted layer of the thermo-plastic material, impermeable to ink, thus forming non-printing elements.
  • the printing plate's case together with the printed plate 15, glued or melted into it along its perimeter is mounted into a suitable stamp mount and the rubber stamp is ready for use.
  • a printing plate's case shown in Fig. 1 was used.
  • Plate 3 was performed as a construction from polyethylene, the lower side of which was a 2 mm thick framework with ca 20 3 by 3 mm holes in it. The upper part of this framework was supported by 30 small columns whose diameter was 2 mm.
  • the printing surface 5 of the blank printing plate 2 was darkened with graphite powder.
  • a semi-transparent means 6 was placed with a light-absorbing typeset pattern 8 on it.
  • the means 6 was made of vellum paper on which the type-face was printed by laser printer. For better light transparency the vellum paper was impregnated with vegetable oil .
  • the vellum paper was then covered with a 0.1 mm thick separating nitrocellulose film 9 .
  • the printing plate's case was poured ca 2 ml of stamp ink. After that the cavity of the printing plate's case was connected by means of a tube 16 with a source of compressed air at the pressure ca 0.8 MPa.
  • the impulse light source under the glass plate 6 consisted of Xenon discharge tubes with diameters of 10 mm and the distance between the electrodes 130 mm. An array of parallel discharge tubes with 20 mm pitch was used. In each tube a discharge with electrical energy of 200 J was created. After that the printing plate's case was disconnected from the compressed air source and detached from the glass plate 6, the separating film 9 and the means 7.
  • the ink had filled the printing plate 15 and the rubber stamp manufactured in that way left on paper a fine high quality imprint, exactly corresponding to the typeset pattern 8 printed by laser printer on vellum paper.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

Procédé et appareil de fabrication de timbres en caoutchouc microporeux à préencrage, consistant à fermer des pores de manière sélective par le chauffage sélectif de la surface d'une planche d'impression thermoplastique microporeuse vierge (2) qui est montée dans son boîtier par collage ou fusion le long de son périmètre. Le chauffage sélectif s'effectue à l'aide d'un rayonnement lumineux ou d'une tête thermique; simultanément, la surface de travail de la planche d'impression vierge est plaquée sur une surface de support avec une pression d'au moins 0,2 MPa. Ce procédé comprend les étapes suivantes: on verse de l'encre d'estampage dans la cavité du boîtier de la planche d'impression, de sorte qu'elle recouvre la surface arrière de la planche d'impression; on fixe le boîtier de la planche d'impression avec ladite planche contre la surface de support, puis on augmente la pression hydrostatique à l'intérieur de la cavité du boîtier de la planche d'impression, par exemple en reliant le boîtier à une source d'air comprimé. Afin d'éviter le bombement du boîtier de la planche d'impression sous l'effet de la pression élevée, et afin de fixer ledit boîtier contre la surface de support, on utilise un moule creux qui soutient le boîtier par le haut et par les côtés.
PCT/EE1997/000002 1996-06-12 1997-06-11 Procede et appareil de fabrication de timbres en caoutchouc a preencrage Ceased WO1997047471A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29516/97A AU2951697A (en) 1996-06-12 1997-06-11 A method and apparatus for the manufacture of pre-inkable rubber stamps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EEP9600036 1996-06-12
EE9600036A EE9600036A (et) 1996-06-12 1996-06-12 Meetod templivärviga täidetavate templite valmistamiseks

Publications (1)

Publication Number Publication Date
WO1997047471A1 true WO1997047471A1 (fr) 1997-12-18

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ID=8161674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EE1997/000002 Ceased WO1997047471A1 (fr) 1996-06-12 1997-06-11 Procede et appareil de fabrication de timbres en caoutchouc a preencrage

Country Status (3)

Country Link
AU (1) AU2951697A (fr)
EE (1) EE9600036A (fr)
WO (1) WO1997047471A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006042560A1 (fr) 2004-10-19 2006-04-27 Leo-Henn Humal Procede de fabrication de tampons a preencrage et element de tampon
AT512968A1 (de) * 2012-05-15 2013-12-15 Trodat Gmbh Stempel, insbesondere Rund-Stempel
AT512966A1 (de) * 2012-05-15 2013-12-15 Trodat Gmbh Stempel und Verfahren zum Tränken eines Farbspeicherkörpers eines Stempels mit Stempelfarbe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009730A1 (fr) * 1993-10-02 1995-04-13 Mitsubishi Pencil Kabushiki Kaisha Procede pour fabriquer une plaque en forme de tampon, et tampon ainsi obtenu

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009730A1 (fr) * 1993-10-02 1995-04-13 Mitsubishi Pencil Kabushiki Kaisha Procede pour fabriquer une plaque en forme de tampon, et tampon ainsi obtenu

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006042560A1 (fr) 2004-10-19 2006-04-27 Leo-Henn Humal Procede de fabrication de tampons a preencrage et element de tampon
US7810428B2 (en) 2004-10-19 2010-10-12 Leo-Henn Humal Method of manufacturing pre-inked stamps and stamp member
AT512968A1 (de) * 2012-05-15 2013-12-15 Trodat Gmbh Stempel, insbesondere Rund-Stempel
AT512966A1 (de) * 2012-05-15 2013-12-15 Trodat Gmbh Stempel und Verfahren zum Tränken eines Farbspeicherkörpers eines Stempels mit Stempelfarbe

Also Published As

Publication number Publication date
AU2951697A (en) 1998-01-07
EE9600036A (et) 1997-12-15

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