US3505955A - Method and arrangement for producing printing forms - Google Patents

Method and arrangement for producing printing forms Download PDF

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Publication number
US3505955A
US3505955A US608398A US3505955DA US3505955A US 3505955 A US3505955 A US 3505955A US 608398 A US608398 A US 608398A US 3505955D A US3505955D A US 3505955DA US 3505955 A US3505955 A US 3505955A
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Prior art keywords
transfer
backing sheet
sheet
portions
layer
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US608398A
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English (en)
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Gerhard Ritzerfeld
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/04—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet using solvent-soluble dyestuffs on the master sheets, e.g. alcohol-soluble
    • 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

Definitions

  • the thus formed assembly is then subjected to heat radiation directed against the imprinted face of the backing sheet so as to selectively heat the mirror image forming portions on the other face thereof and the corresponding contacting portions of the dye-containing transfer sheet to at least their softening points thereby adhering the heated mirror image-forming portions of the dyecontaining transfer sheet to the backing sheet and producing a printing form comprising the backing sheet, mirror image-forming portions of the transferable dyecontaining transfer layer, and interposed corresponding portions of the heat radiation absorbing material containing layer.
  • the present invention is concerned with a method and an arrangement for producing printing forms of the type comprising a mirror image of the indicia which are to be printed, which mirror image includes a transferable dye which, for instance, may be transferred to a copy sheet upon being moistened with an alcoholic liquid.
  • sprit duplicating devices and methods utilize triphenylmethane dye stuffs which-even though they are generally embedded in a binding material-due to their high degree of solubility in alcohol or water tend to soil the hands of the operator as well as the typewriter or the like which is used to imprint the reproducible master sheet.
  • a particularly high degree of soiling is experienced when it is necessary to carry out erasures whereby particles of the dye will become located in the typewriter and on the clothing and hands of the typist.
  • the protective layer will be interposed between the base sheet of the printing form and the relatively heavy layer containing the transferable dye, the latter being exposed, so that upon handling of the printing form or upon removal of the ink transfer sheet the risk of soiling is again very considerable. This is particularly so during the warm season and in the case of electric typewriters and teletypes which are warmed by the operation of the electric motor connected therewith.
  • thermographic processes It has been proposed to overcome these problems by producing the printing forms by thermographic processes.
  • several serious disadvanges are connected therewith which greatly reduce the practical applicability of thermographic processes for the preparation of printing forms of the type described.
  • carbons which consisted of a transparent paper on which indicia has been formed by means of a thermographic color ribbon or a pigment dye.
  • an extraordinarily thin transparent paper weighing for instance 60 gr./m. as compared with the conventional transparent paper weighing about 80 gr./m.
  • the backing sheets of the printing forms had to be very thin, so as to have a maximum weight of between about 30-35 gr./m. since the printing forms had to be placed opposite the source of radiation, and the radiation had to pass through the printing form and the color or ink transfer sheet to the heat reflecting original.
  • Printing forms with such very thin backing sheets are impractical in most cases because of their low resistance to creasing in the duplicating device and because of the difficulties involved in filing and storing the same.
  • thermographic color ribbon Another method has been proposed according to which an original was imprinted or written on at its front face by means of a thermographic color ribbon.
  • the printing form had to carry at its rear face a latently adhesive layer which could be activated by exposure to heat.
  • This layer consisted of waxes and resins and was free of pigment constituents.
  • radiation had to be applied in such a manner as to impinge first at the front face of the printing form and consequently it was necessary to use printing forms having a relatively thin backing sheet weighing about 4050 gr./m so that the selective heating produced at the front face could pass through the backing sheet into the contacting hectographic ink transfer sheet.
  • the present invention proposes a method of preparing printing forms adapted for use in a sprit duplicator and the like by forming a multi-layer structure including, in the indicated sequence, a first backing sheet, a first transfer layer adhering to the first backing sheet and consisting essentially of a transfer material having a predetermined relatively low softening point, being free of transferable dye stuffs and having incorporated therein and substantially evenly distributed therethrough a heat radiation absorbing material, and a second backing sheet having a free face and another face, the latter contacting the first transfer layer, exerting pressure against the free face of the second backing sheet so as to adhere corresponding portions of the first transfer layer to the other face of the second backing sheet, the transferred portions forming on the other face of the second backing sheet a mirror image of the pressure-exposed portions of the free face of the second backing sheet, separating the second backing sheet with the mirror image-forming portions of the first transfer layer thereon from the multi-layer structure, contacting the separated second backing sheet with a second
  • the present invention also encompasses arrangements and transfer sheets as described above.
  • FIG.1 illustrates the imprinting of the prospective printing form, i.e., of the backing sheet thereof with an underposed carbon paper;
  • FIG. 2 illustrates the arrangement of FIG. 1 after imprinting
  • FIG. 3 illustrates the arrangement of a backing sheet processed as illustrated in FIGS. 1 and 2 and superposed upon a color transfer sheet;
  • FIG. 4 illustrates the printing form and the color transfer sheet as they appear after transfer of selected portions of the color transfer sheet to the printing form in accordance with FIG. 3;
  • FIG. 5 substantially corresponds to FIG. 1, however, illustrates the imprinting with the interposition of a color ribbon between the indicia-forming, pressure-exerting member and the backing sheet of the prospective printing form.
  • FIG. 6 corresponds to FIG. 5 in the same manner as FIG. 2 corresponds to FIG. 1;
  • FIG. 7 illustrates the forming of reproducible mirror image indicia under utilization of a color transfer sheet, the color transfer layer of which is protected by a protective layer;
  • FIG. 8 illustrates the printing form and the color transfer sheet after adhering selected portions of the protective layer and of the color transfer layer to the printing form as illustrated in FIG. 7.
  • a backing sheet 3 of the printing form is used for producing a latent printing form to which the printing ink or the like is not applied during imprinting of the printing form but subsequent thereto, for instance shortly prior to making copies of the printing form in a sprit duplicator or the like.
  • Element 1 represents a typewriter key, but might also be replaced by a pencil, stylus or the like for imprinting one face of the backing sheet 3 of the printing form with indicia 2, the transferable mirror image of which is to be formed at the opposite face of backing sheet 3.
  • Backing sheet 3 preferably will be a casein coated high gloss paper. Imprinting, for instance with a typewriter, may be carried out with or without interposition of a color ribbon.
  • backing sheet 3 is superposed and in contact with carbon paper 11 comprising transferable carbon dye layer 5 and paper backing 12.
  • carbon paper 11 comprising transferable carbon dye layer 5 and paper backing 12.
  • Carbon paper 11 may be replaced with another transfer sheet including a transfer layer 5, provided that the transfer layer includes heat radiation absorbing material, preferably a particulate material such as pigments evenly distributed throughout layer 5, so that upon exposure to heat radiation the pigments or the like will be heated to a relatively high temperature.
  • the transfer layer includes heat radiation absorbing material, preferably a particulate material such as pigments evenly distributed throughout layer 5, so that upon exposure to heat radiation the pigments or the like will be heated to a relatively high temperature.
  • FIG. 2 illustrates the backing sheet 3 of the printing form and carbon or the like paper 11 after imprinting and separation. It will be seen that due to the pressure exerted by typewriter key 1 during formation of indicia 2 at the upper face of backing sheet 3, corresponding portions 4 of transferable carbon black or pigment-containing layer 5 will have been separated from transfer sheet 11 and attached to the lower face of backing sheet 3 forming thereon a mirror image of indicia 2. The residual portions of transfer layer 5, i.e., the portions thereof which were not exposed to pressure, are retained in contact with backing sheet 12 of transfer sheet 11.
  • the thus formed latent printing form including backing sheet 3 and mirror image forming, heat radiation abosrbing portions 4 is then superposed upon an ink transfer sheet 13 comprising a backing sheet 6 and an ink or dye transfer layer 7, the latter being in contact with the face of backing sheet 3 which carries mirror image portions 4.
  • the ink transfer layer 7 includes an aniline dye.
  • the mirror image-forming portions on the lower face of the printing form backing sheet which portions include the heat radiation absorbing material, will be sufficiently heated to at least soften or even melt corresponding portions of ink transfer layer 7 so that these corresponding portions will be adhered to the mirror image forming portions 4 and, upon separation of the ink transfer sheet from the printing form, Will adhere to the printing form, as illustrated in FIG. 4, forming thereon a transferable mirror image of indicia 2.
  • FIG. 4 shows the completed printing form after cooling and separation from ink transfer sheet 13. It will be seen that layer portions 7a of ink transfer layer 7 are now attached to the mirror image forming carbon or pigment containing portions at the printing face of backing sheet 3 of the printing form, whereas ink transfer layer portions 7b, which had not been heated due to the fact that they were not juxtaposed to heat radiation absorbing material, remain adhered to backing sheet 6 of ink transfer sheet 13.
  • a color ribbon is interposed between typewriter key 1 and backing sheet 3 so that the indicia 2 are formed by pressure transfer from the typewriter ribbon 10 to the face of backing sheet 3.
  • indicia 2 is formed on the opposite face of backing sheet 3 by pressure transfer of corresponding portions of the pigment or carbon black-containing transfer layer of transfer sheet 11.
  • Backing sheet 12 of transfer sheet 11 as well as the other backing sheets described herein, may consist for instance of paper or of a synthetic material.
  • FIG. 6 illustrates the latent printing form produced according to FIG. 5, after separation from transfer sheet 11.
  • the protective layer '9 contacts the mirror image portions carrying face of backing sheet 3.
  • the heat radiation absorbing material of mirror image portions 4 will be sufiiciently heated to soften or melt corresponding portions of adjacent protective and ink transfer layers 9 and 7 so that, upon cooling and separation of the thus produced printing form from the ink transfer sheet, the mirror image forming portions of the ink transfer sheet will adhere, with interposition of corresponding portions of the protective layer, to the mirror image-forming portions of the heat radiation absorbing material, and thus to backing sheet 3.
  • the portions 911 and 7b of the protective layer and of the ink transfer layer which were not juxtaposed to the mirror image portions 4 andthus were not heated to their softening point will remain attached to backing sheet 6 of ink transfer sheet 13.
  • backing sheet 3 of the printing form will consist of paper, synthetic material or the like and will have a thickness corresponding to a weight of at least about 60 gr./m.
  • Transfer layer 5 which includes the heat radiation a-bsorbing material such as carbon black or pigments will act as a binder material and preferably will melt or at least substantially soften at a temperature below- C.
  • a latent printing form which carries legible indicia on one face and a mirror image of these indicia consisting of a transfer material of relatively low softening point, being substantially free of transferable dye stuffs and having incorporated therein and substantially evenly distributed therethrough a heat radiation absorbing material, on its other face.
  • a second transfer sheet which is an ink transfer sheet including a transfer layer containing transferable ink or the like is then placed against the mirror image-carrying face of backing sheet 3.
  • the ink transfer layer of transfer sheet 13 consists essentially of a transferable binder material having a melting point which is also below about 100 C. and having incorporated therein a dye stuff which, for instance, is soluble in alcoholic liquids.
  • a protective transferable layer which also has a melting point of below 100 C. or the like may be superposed upon the transferable ink layer.
  • the printing form may be formed as illustrated in FIGS. 3 and 4 and 7 and 8 respectively. It is sometimes preferred to interpose between the free face of ink transfer sheet 13 and the source 8 of heat radiation a radiation diffusing material, for instance a polyester gauze, in order to obtain substantially uniform distribution of the heat radiation, for instance infrared radiation.
  • a radiation diffusing material for instance a polyester gauze
  • Infrared radiation may also be replaced, for instance, by exposure to electric high frequency radiation.
  • backing sheets for the printing form paper sheets or sheets of synthetic material of considerable thickness such as sheets having a weight of between 60- gr./m. and preferably a weight of between 80-110 gr./m.
  • the backing sheets of the transfer sheets may be of lesser thickness and weight.
  • a backing sheet 12 of transfer sheet 11 i.e., the transfer sheet including a transfer layer with heat radiation absorbing material, a sheet of paper or synthetic material having a weight of between about 20-40 gr./m.
  • Transfer compositions which upon exposure to pressure or heat may be transferred from a transfer sheet to a take-up sheet are, per se, well known in the art as well as compositions thereof, which will have any desirable melting point, i.e., in accordance with the present invention, preferably will melt or at least be substantially softened at temperatures below 100 C.
  • Transfer layer may be of the following composition:
  • Example 1 Carnauba wax 1000 Petroleum jelly 1500 Mineral oil 1000 Carbon black 350 Barium sulfate 12000 EXAMPLE 2
  • the composition described in Example 1 may be replaced by the following composition:
  • the transfer layer 7 which includes the transferable dye EXAMPLE 4 A protective transfer layer such as layer 9 may be composed as follows:
  • a method of preparing printing forms adapted for use in a sprit duplicator and the like comprising the steps of forming a multi-layer structure including, in the indicated sequence, a first backing sheet, a first transfer layer adhering to said first backing sheet and consisting essentially of a transfer material having a predetermined relatively low softening point, being free of transferable dyestuffs and having incorporated therein and substantially evenly distributed therethrough a heat radiation absorbing material, and a second backing sheet having a free face and another face, the latter contacting said first transfer layer; exerting pressure against said free face of said second backing sheet so as to adhere corresponding portions of said first transfer layer to said other face of said second backing sheet, said transferred portions fom'iing on said other face of said second backing sheet a mirror image of the pressure-exposed portions of said free face of said second backing sheet; separating said second backing sheet with said mirror image forming portions of said first transfer layer thereon from said multi-layer structure; contacting said separated second backing sheet with a second transfer layer consisting
  • said second backing sheet consists of paper or synthetic material and has a thickness corresponding to a weight of between about 60 and 160 gr./m.
  • said first backing sheet consists of paper or synthetic material and has a thickness corresponding to a weight of between about 20 and 40 gr./m.
  • said second transfer layer includes an alcohol-soluble transferable dye and is supported by a third backing sheet having a thickness corresponding to a Weight of between about 20 and 40 gr./m.
  • said diffusing layer consists essentially of a polyester gauze.
  • An arrangement for use in producing a printing form comprising a first backing sheet carrying on one face thereof a mirror image of indicia to be printed, said mirror image being formed of a transfer material having a softening point below 100 C., being free of transferable dye stuffs and having incorporated therein and substantially evently distributed therethrough discrete particles of a heat radiation absorbing material; and a transfer sheet comprising a second backing sheet and a transfer layer on one face thereof, said transfer layer consisting essentially of a material having a softening point below C. and having a transferable dye distributed therethrough, said transfer layer cfontacting the mirror image indicia carrying face of said first backing sheet.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Color Printing (AREA)
US608398A 1966-01-17 1967-01-10 Method and arrangement for producing printing forms Expired - Lifetime US3505955A (en)

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DER0042441 1966-01-17

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US3505955A true US3505955A (en) 1970-04-14

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US608398A Expired - Lifetime US3505955A (en) 1966-01-17 1967-01-10 Method and arrangement for producing printing forms

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US (1) US3505955A (de)
AT (1) AT269911B (de)
CH (1) CH534581A (de)
DE (1) DE1571804B2 (de)
ES (2) ES335333A1 (de)
FR (1) FR1507826A (de)
GB (1) GB1130805A (de)
SE (1) SE313822B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854976A (en) * 1970-09-25 1974-12-17 Ritzerfeld Gerhard Applicator and method for making a printing form
US3857722A (en) * 1972-04-10 1974-12-31 Australia Res Lab Method for electrostatic duplication
US3900586A (en) * 1972-12-20 1975-08-19 Australia Res Lab Electrostatic duplicating process
CN111171778A (zh) * 2020-01-15 2020-05-19 王超 一种辐射子母版固化胶体及其子板的成型方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8900747D0 (en) * 1989-01-13 1989-03-08 Payne J M Innovators Improved printing process
GB9217321D0 (en) * 1992-08-14 1992-09-30 Columbia Ribbon & Manufacturin Thermal transfer printing ribbon and method of printing

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777781A (en) * 1955-03-04 1957-01-15 Ditto Inc Transfer sheet having waxy top protective coating
US2898852A (en) * 1957-06-10 1959-08-11 Eastman Kodak Co Photomechanical spirit duplicating process
US3031327A (en) * 1959-11-20 1962-04-24 Columbia Ribbon & Carbon Method of preparing transfer sheets
US3087832A (en) * 1958-12-08 1963-04-30 Ncr Co Transferable magnetic coating composition and transfer web coated therewith
US3122997A (en) * 1958-04-04 1964-03-03 Figure
US3129661A (en) * 1960-03-31 1964-04-21 Columbia Ribbon & Carbon Novel duplicating processes
CA693721A (en) * 1964-09-01 F. Koberlein Louis Spirit duplicating process and transfer sheet therefor
US3151550A (en) * 1961-03-27 1964-10-06 Columbia Ribbon & Carbon Duplication
US3170809A (en) * 1962-05-04 1965-02-23 Oxford Paper Co Transfer sheet and process of making
US3226134A (en) * 1961-12-14 1965-12-28 Ancar A G Fa Sets of reproduction transfer sheets
US3342623A (en) * 1961-07-14 1967-09-19 Eastman Kodak Co Heat-sensitive elements for use in thermography
US3384015A (en) * 1965-03-23 1968-05-21 Columbia Ribbon & Carbon Thermographic method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA693721A (en) * 1964-09-01 F. Koberlein Louis Spirit duplicating process and transfer sheet therefor
US2777781A (en) * 1955-03-04 1957-01-15 Ditto Inc Transfer sheet having waxy top protective coating
US2898852A (en) * 1957-06-10 1959-08-11 Eastman Kodak Co Photomechanical spirit duplicating process
US3122997A (en) * 1958-04-04 1964-03-03 Figure
US3087832A (en) * 1958-12-08 1963-04-30 Ncr Co Transferable magnetic coating composition and transfer web coated therewith
US3031327A (en) * 1959-11-20 1962-04-24 Columbia Ribbon & Carbon Method of preparing transfer sheets
US3129661A (en) * 1960-03-31 1964-04-21 Columbia Ribbon & Carbon Novel duplicating processes
US3151550A (en) * 1961-03-27 1964-10-06 Columbia Ribbon & Carbon Duplication
US3342623A (en) * 1961-07-14 1967-09-19 Eastman Kodak Co Heat-sensitive elements for use in thermography
US3226134A (en) * 1961-12-14 1965-12-28 Ancar A G Fa Sets of reproduction transfer sheets
US3170809A (en) * 1962-05-04 1965-02-23 Oxford Paper Co Transfer sheet and process of making
US3384015A (en) * 1965-03-23 1968-05-21 Columbia Ribbon & Carbon Thermographic method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854976A (en) * 1970-09-25 1974-12-17 Ritzerfeld Gerhard Applicator and method for making a printing form
US3857722A (en) * 1972-04-10 1974-12-31 Australia Res Lab Method for electrostatic duplication
US3900586A (en) * 1972-12-20 1975-08-19 Australia Res Lab Electrostatic duplicating process
CN111171778A (zh) * 2020-01-15 2020-05-19 王超 一种辐射子母版固化胶体及其子板的成型方法

Also Published As

Publication number Publication date
ES134159U (es) 1968-03-16
CH534581A (de) 1973-03-15
DE1571804A1 (de) 1971-01-07
SE313822B (de) 1969-08-25
FR1507826A (fr) 1967-12-29
GB1130805A (en) 1968-10-16
ES134159Y (es) 1968-08-01
DE1571804B2 (de) 1973-11-08
AT269911B (de) 1969-04-10
ES335333A1 (es) 1968-04-01

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