EP0092988B1 - Offsetdruck - Google Patents

Offsetdruck Download PDF

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Publication number
EP0092988B1
EP0092988B1 EP19830302297 EP83302297A EP0092988B1 EP 0092988 B1 EP0092988 B1 EP 0092988B1 EP 19830302297 EP19830302297 EP 19830302297 EP 83302297 A EP83302297 A EP 83302297A EP 0092988 B1 EP0092988 B1 EP 0092988B1
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EP
European Patent Office
Prior art keywords
intermediate surface
ink
silicone rubber
pad
design
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830302297
Other languages
English (en)
French (fr)
Other versions
EP0092988A2 (de
EP0092988A3 (en
Inventor
John Frederick Birtles
Robert Dennis Brett
Wilfred Roberts
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.)
British Ceramic Research Association Ltd
Original Assignee
British Ceramic Research Association Ltd
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 British Ceramic Research Association Ltd filed Critical British Ceramic Research Association Ltd
Publication of EP0092988A2 publication Critical patent/EP0092988A2/de
Publication of EP0092988A3 publication Critical patent/EP0092988A3/en
Application granted granted Critical
Publication of EP0092988B1 publication Critical patent/EP0092988B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/40—Printing on bodies of particular shapes, e.g. golf balls, candles, wine corks

Definitions

  • This invention relates to repetitive off-set printing processes of the kind in which a deformable pad is employed to transfer an ink design to an article.
  • Off-set transfer pad processes for printing onto complex shapes are well established in the ceramic, plastics, toy and packaging industries. The majority of these processes use a deformable gelatine or silicone rubber pad to transfer an ink design from an intaglio metal plate to the items to be decorated or marked.
  • the metal plate can be engraved or etched.
  • U.K. Patent Specification 737 461 has proposed replacing the intaglio metal plate by a silk screen and an intermediate flat surface.
  • the ink design is applied to the intermediate flat surface by screen printing and then transferred to the item to be marked or decorated by means of the deformable pad.
  • the intermediate surface can be any non-absorbent material, and examples of metal or glass were given.
  • the ink film on the intermediate surface split on removal of the deformable pad from the intermediate surface. The result was that the design ink spread with successive prints and there was a loss of definition.
  • the present invention stems from attempts to provide an improved off-set printing process, where the ink design on the intermediate surface is transferred substantially completely to the item to be marked or decorated by the deformable pad.
  • the basis for the present invention lies in our discovery that the relative affinity of an ink for the intermediate surface, deformable pad and work piece can be controlled by the use of two dissimilar silicone rubbers for pad and intermediate surface, the silicone rubbers differing in the catalysts that are employed in curing of the rubbers.
  • U.S. Specification No. 4,261,749 is concerned with a thermoplastic ink formulation for use in an off-set process in which an ink design is applied to a silicone elastomer intermediate surface and is then transferred to the ware by a further silicone elastomer. It is stated at lines 47 to 51 of column 4 that 'it is highly desirable to have as great a difference in surface energy as possible between the two silicone surfaces in order to facilitate ink release from one to the other', but no details are given of what rubbers are to be employed. It would appear that it was contemplated to provide different surface energies by employing different compositions of rubber, such as by varying the phenyl/methyl ratio as was previously known.
  • U.S. Specification No. 4 261 749 is concerned with devising an ink formulation to accommodate changes in ink affinity of the silicone rubber surfaces which occur in use, whereas the present invention is concerned with providing substantially stable ink affinities of the two surfaces, so that the silicone rubber surfaces rarely, if ever, require replacement to alter ink affinity.
  • U.S. Specification No. 3 554 836 has an abstract reading 'A process for the controlled reception and transmission of thermoplastic transfer medium via one or more silicone elastomer surfaces to final deposition on a receptor surface which may be another silicone elastomer surface or, more generally, paper, a polymeric film, metal, glass, clay, etc.
  • the process utilizes forces intrinsic to the materials employed, i.e., silicone elastomers, thermoplastic transfer medium (ink) and the various receptor surfaces.
  • the physical state of the transfer medium can be manipulated to provide for non-splitting transfer from one silicone elastomer surface to another, adhesively favored silicone elastomer or nonsilicone elastomer surface.
  • the process finds utility in the coating, printing, and duplicating field'.
  • a repetitive off-set printing process in which an ink design is first applied to an intermediate surface from which it is then transferred to an article by a deformable pad, the intermediate surface and the pad being formed of first and second condensation-cured silicone rubbers respectively, characterised in that the first and second rubbers employ different catalysts in the curing thereof, and the catalysts are chosen such that the affinity of the first silicone rubber for the ink is substantially less than the affinity of the second silicone rubber for the ink, whereby when the deformable pad contacts the intermediate surface the design is substantially completely transferred from the intermediate surface to the pad thereby avoiding the need to doctor the intermediate surface prior to the next printing cycle.
  • a repetitive off-set printing process in which an ink design is first applied to an intermediate surface from which it is then transferred to an article by a deformable pad, the intermediate surface and the pad being formed of first and second silicone rubbers respectively, characterised in that the first silicone rubber is a condensation-cured silicone rubber, the second silicone rubber is an addition-cured silicone rubber, and the catalyst used in curing the first silicone rubber is chosen such that the affinity of the first silicone rubber for the ink is substantially less than the affinity of the second silicone rubber for the ink, whereby when the deformable pad contacts the intermediate surface the design is substantially completely transferred from the intermediate surface to the pad thereby avoiding the need to doctor the intermediate surface prior to the next printing cycle.
  • the ink design may be applied to the intermediate surface by any suitable method. Preferably silk screening will be employed, but other stencilling operations may be used.
  • the intermediate surface is preferably flat.
  • condensation type silicone rubbers having a wide range of ink affinities can be produced by employing as catalysts the carboxylic acid salts of various metals such as Pb, Zn, Zr, Sb, Fe, Cd, Sn, Ba, Ca, and Mn.
  • ink affinities is provided by the following list of salts: metal naphthenates, octoates, hexoates, laurates and acetates, the ink affinity generally reducing through the list.
  • silicone rubbers of the condensation type and using dibutyltindilaurate as the catalyst in the curing process, have much less affinity for ink than condensation cure rubbers using most other catalysts in the curing process or addition cure rubbers.
  • a stabilised dibutyltindilaurate catalysed silicone rubber provides an ideal material for the intermediate surface. It is able to accept ink from the silk screen to form a design of high definition but then, on subsequent pressure contact from a deformable pad of a suitably dissimilar silicone rubber, due to differences in ink affinity, it gives up the ink design 100% to the pad.
  • An electrically heated metal screen is conveniently used, but an externally heated screen may be employed.
  • ink should be compatible with the silicone rubber of both transfer pad and intermediate surface and not induce significant deterioration in either during the period of printing. It has been found that inks meeting all the above criteria are preferably composed of a solid resin, a liquid resin, a wax and a ceramic pigment.
  • the wax should have a melting point below the desired silk-screen temperature and the solid resin a melting point above this temperature. Viscosity control at the silk screen is effected by adjustment to the solid/liquid resin ratio and tack at the transfer stage by the wax to total resin ratio.
  • an off-set machine suitable for use in repetitively printing onto the curved surfaces of articles, comprises an intermediate surface, means for applying an ink design to the intermediate surface, a deformable pad, means for bringing the deformable pad into register with the intermediate surface to pick up the ink design, and means for bringing the pad carrying the ink design into register with an article to transfer the ink design to the article, characterised in that the intermediate surface and the pad are formed of first and second condensation-cured silicone rubbers respectively, the first and second rubbers employ different catalysts in the curing thereof, and the catalysts are chosen such that the affinity of the first silicone rubber for the ink is substantially less than the affinity of the second silicone rubber for the ink, whereby in use of the machine when the deformable pad contacts the intermediate surface the design is substantially completely transferred from the intermediate surface to the pad, thereby avoiding the need for a doctoring means for doctoring the intermediate surface.
  • an off-set machine suitable for use in repetitively printing onto the curved surfaces of articles comprises an intermediate surface, means for applying an ink design to the immediate surface, a deformable pad, means for bringing the deformable pad into register with the intermediate surface to pick up the ink design, and means for bringing the pad carrying the ink design into register with an article to transfer the ink design to the article, characterised in that the intermediate surface and the pad are formed of first and second silicone rubbers respectively, the first silicone rubber is a condensation-cured rubber, and the second silicone rubber is an addition-cured rubber, and the catalyst used in curing the first silicone rubber is chosen such that the affinity of the first silicone rubber for the ink is substantially less than the affinity of the second silicone rubber for the ink, whereby in use of the machine when the deformable pad contacts the intermediate surface the design is substantially completely transferred from the intermediate surface to the pad, thereby avoiding the need for a doctoring means for doctoring the intermediate surface.
  • an electrically heated metal screen and an ink formulation are employed such that, at the temperature of the screen, the ink viscosity is correct for screen printing.
  • the ink in the form of the required design is screened onto the intermediate surface of stabilised dibutyltindilaurate catalysed silicone rubber which is heated to a lower temperature than the screen, such that after screening the tack properties of the ink dominate.
  • a deformable pad of dissimilar silicone rubber for example addition cured or octoate-catalysed condensation cured, is used to pick up the ink design 100% from the intermediate surface. In the final stage of the operation the pad transfers the ink design 100% to the work piece.
  • the process is illustrated diagrammatically in the accompanying single Figure in which the reference numeral 1 designates the heated silk screen, 2 designates the ink design, 3 designates the heated intermediate surface, 4 designates the deformable pad, and 5 designates the work piece.
  • addition cured rubbers are formed via a poly-attachment method between (aw) vinyl terminated and hydrogen substituted dimethyl polysiloxane precursors as shown below.
  • the reaction is usually catalysed using platinum complexes.
  • Rubbers of this type are available commercially and these can be used to fabricate the transfer pad.
  • the precursor materials for these rubbers are supplied typically in a two pack from, namely:
  • the rubber is formed by mixing of the two components.
  • the hardness of the rubber can be modified to the required degree by the addition of a dimethyl polysiloxane silicone oil having a viscosity of 50 10- 5 m 2 sec.
  • Typical rubber formulations to give the required hardness for the transfer pad of the present invention will be found within the following compositional range.
  • condensation cured rubbers are formed by the reaction between (aw) hydroxy terminated dimethyl polysiloxanes and a cross linking agent having at least three reactive sites e.g. tetra ethyl orthosilicate or partially hydrolysed tetra ethyl orthosilicate.
  • a cross linking agent having at least three reactive sites e.g. tetra ethyl orthosilicate or partially hydrolysed tetra ethyl orthosilicate. The reaction is shown below.
  • a dimethyl polysiloxane silicone oil having a viscosity of 5 ⁇ 10 -5 m 2 sec is used to modify the rubber to give the appropriate hardness for printing.
  • the intermediate surface examples are produced only from condensation cure rubbers but using as the catalyst for the reasons stated previously.
  • Example (B1) or (B2) is produced as a thin uniform layer 0.5 to 5 mm in thickness on a metal backing. Following fabrication and cure the rubber is stabilised by heat treating for 4 h at 110°C.
  • the ink formulations are typically based on the use as carrier vehicle of two esters of hydrogenated rosins, the one modified with triethylene glycol, the other with glycerol.
  • a working example is as follows:
  • the ink is produced by intimate mixing of the components either by bead or triple roll mill.

Landscapes

  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Claims (23)

1. Verfahren zum wiederholten Offset-Druck, bei welchem eine Gestaltung (2) in Druckfarbe zunächst auf eine Zwischenoberfläche (3) aufgebracht wird, von der sie dann mittels eines verformbaren Kissens (4) auf einen Gegenstand (5) übertragen wird, wobei die Zwischenoberfläche und das Kissen aus einem ersten bzw. zweiten kondensationsgehärteten Silikon-Gummi bestehen, dadurch gekennzeichnet, daß bei der Aushärtung des ersten und zweiten Gummis unterschiedliche Katalysatoren Anwendung finden, die so gewählt sind, daß die Affinität des ersten Silikon-Gummis zu der Druckfarbe wesentlich geringer als die Affinität des zweiten Silikon-Gummis für die Druckfarbe ist, wodurch bei Berührung der Zwischenoberfläche durch das verformbare Kissen die Gestaltung im wesentlichen vollständig von der Zwischenoberfläche auf das Kissen übertragen wird und ein Abrakeln der Zwischenoberfläche vor dem nächsten Druckzyklus sich erübrigt.
2. Verfahren zum wiederholten Offset-Druck, bei welchem eine Gestaltung (2) in Druckfarbe zunächst auf eine Zwischenoberfläche (3) aufgebracht wird, von der sie dann mittels enes verformbaren Kissens (4) auf einen Gegenstand (5) übertragen wird, wobei die Zwischenoberfläche und das Kissen aus einem ersten bzw. zweiten Silikon-Gummi bestehen, dadurch gekennzeichnet, daß der erste Silikon-Gummi ein kondensationsgehärteter Silikon-Gummi und der zweite Silikon-Gummi ein additionsgehärteter Silikon-Gummi sind und der bei der Aushärtung des ersten Silikon-Gummis verwendete Katalysator so gewählt ist, daß die Affinität des ersten Silikon-Gummis zu der Druckfarbe wesentlich geringer als die Affinität des zweiten Silikon-Gummis für die Druckfarbe ist, wodurch bei Berührung der Zwischenoberfläche durch das verformbare Kissen die Gestaltung im wesentlichen vollständig von der Zwischenoberfläche auf das Kissen übertragen wird und sich ein Abrakeln der Zwischenoberfläche vor dem nächsten Druckzyklus erübrigt.
3. Verfahren nach Anspruch 1 oder 2, bei welchem der beim Aushärten des ersten Silikon-Gumrriis verwendete Katalysator ein Metallsalz der Carboxylsäure ist.
4. Verfahren nach Anspruch 3, bei welchem das Salz ein Metallaurat ist.
5. Verfahren nach Anspruch 4, bei welchem das Salz ein Dibutylmetalldilaurat ist.
6. Verfahren nach Anspruch 5, bei welchem das Salz ein Dibutylzinndilaurat ist.
7. Verfahren nach Anspruch 1 oder einem der Ansprüche 3 bis 6 jeweils in Abhängigkeit von Anspruch 1, bei welchem der beim Aushärten des zweiten Silikon-Gummis verwendete Katalysator ein Metallsalz der Carboxylsäure ist.
8. Verfahren nach einem der Ansprüche 4 bis 6 jeweils in Abhängigkeit von Anspruch 1, bei welchem der beim Aushärten des zweiten Silikon-Gummis verwendete Katalysator ein Metalloktoat ist.
9. Verfahren nach Anspruch 8, bei welchem das Metalloktoat ein Zinnoktoat ist.
10. Verfahren nach einem der vorangehenden Ansprüche, bei welchem der erste Silikon-Gummi nach dem Aushärten wärmebehandelt wurde, um die Druckfarben-Affinitätseingenschaften im wesentlichen zu stabilisieren.
11. Verfahren nach einem der vorangehenden Ansprüche, bei welchem die Gestaltung in Druckfarbe auf die Zwischenoberfläche durch ein Siebdruckverfahren übertragen wird.
12. Verfahren nach Anspruch 11, bei welchem das Sieb und die Zwischenoberfläche auf einer höheren Temperatur als die Umgebungstemperatur gehalten werden, wobei die Siebtemperatur höher als die .Temperatur der Zwischenoberfläche ist.
13. Verfahren nach Anspruch 12, bei welchem das Sieb auf einer Temperatur im Bereich von 60 bis 100°C und die Zwischenoberfläche auf einer Temperatur im Bereich von 30 bis 45°C gehalten werden.
14. Offset-Maschine für wiederholten Druck auf gewölbte Oberflächen von Gegenständen (5), mit einer Zwischenoberfläche (3), mit Mitteln zur Aufbringung einer Gestaltung (2) in Druckfarbe auf die Zwischenoberfläche, mit einem verformbaren Kissen (4), mit Mitteln, um das verformbare Kissen in Anlage an der Zwischenoberfläche zur Aufnahme der Gestaltung in Druckfarbe zu bringen, und mit Mitteln, um das Kissen mit der Gestaltung in Druckfarbe in Anlage an einem Gegenstand zu bringen und die Gestaltung in Druckfarbe auf den Gegenstand zu übertragen, dadurch gekennzeichnet, daß die Zwischenoberfläche und das Kissen aus einem ersten bzw. einem zweiten kondensationsgehärteten Silikon-Gummi bestehen, daß bei der Aushärtung des ersten und zweiten Silikon-Gummis unterschiedliche Katalysatoren verwendet sind und daß die Katalysatoren derart gewählt sind, daß die Affinität des ersten Silikon-Gummis zu der Druckfarbe wesentlich geringer als die Affinität des zweiten Silikon-Gummis zu der Druckfarbe ist, wodurch im Betrieb der Maschine bei der Berührung der Zwischenoberfläche durch das verformbare Kissen die Gestaltung im wesentlichen vollständig von der Zwischenoberfläche auf das Kissen übertragen wird und sich eine Rakeleinrichtung zum Abrakeln der Zwischenoberfläche erübrigt.
15. Offset-Maschine für wiederholten Druck auf gewölbte Oberflächen von Gegenständen (5), mit einer Zwischenoberfläche (3), mit Mitteln zur Aufbringung einer Gestaltung (2) in Druckfarbe auf die Zwischenoberfläche, mit einem verformbaren Kissen (4), mit Mitteln, um das verformbare Kissen in Anlage an der Zwischenoberfläche zur Aufnahme der Gestaltung in Druckfarbe zu bringen, und mit Mitteln, um das Kissen mit der Gestaltung in Druckfarbe in Anlage an einem Gegenstand zu bringen und die Gestaltung in Druckfarbe auf den Gegenstand zu übertragen, dadurch gekennzeichnet, daß die Zwischenoberfläche und das Kissen aus einem ersten bzw. zweiten Silikon-Gummi bestehen, daß der erste Silikon-Gummi ein kondensationsgehärteter Gummi und der zweite Silikon-Gummi ein additionsgehärteter Gummi sind und daß der bei der Aushärtung des ersten Silikon-Gummis verwendete Katalysator derart gewählt ist, daß die Affinität des ersten Silikon-Gummis zu der Druckfarbe wesentlich geringer als die Affinität des zweiten Silikon-Gummis zu der Druckfarbe ist, wodurch im Betrieb der Maschine bei der Berührung der Zwischenoberfläche durch das verformbare Kissen die Gestaltung im wesentlichen vollständig von der Zwischenoberfläche auf das Kissen übertragen wird und sich eine Rakeleinrichtung zum Abrakeln der Zwischenoberfläche erübrigt.
16. Maschine nach Anspruch 14 oder 15, bei welcher der bei der Aushärtung des ersten Silikon-Gummis verwendete Katalysator ein Metallsalz der Carboxylsäure ist.
17. Maschine nach Anspruch 16, bei welcher das Salz ein Metallaurat ist.
18. Maschine nach Anspruch 17, bei welcher das Salz ein Dibutylmetalldilaurat ist.
19. Maschine nach Anspruch 18, bei welcher das Salz ein Dibutylzinndilaurat ist.
20. Maschine nach Anspruch 14 oder einem der Ansprüche 16 bis 19 jeweils in Abhängigkeit von Anspruch 14, bei welcher der bei der Aushärtung des zweiten Silikon-Gummis verwendete Katalysator ein Metallsalz der Carboxylsäure ist.
21. Maschine nach einem der Ansprüche 17 bis 19 jeweils in Abhängigkeit von Anspruch 14, bei welcher der bei der Aushärtung des zweiten Silikon-Gummis verwendete Katalysator ein Metalloktoat ist.
22. Maschine nach einem der Ansprüche 14 bis 21, bei welcher der erste Silikon-Gummi nach der Aushärtung wärmebehandelt ist, um seine Druckfarben-Affinitätseigenschaften im wesentlichen zu stabilisieren.
23. Maschine nach einem der Ansprüche 14 bis 22, bei welcher die Mittel zur Aufbringung der Gestaltung in Druckfarbe auf die Zwischenoberfläche ein Sieb umfassen.
EP19830302297 1982-04-24 1983-04-22 Offsetdruck Expired EP0092988B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8211917 1982-04-24
GB8211917 1982-04-24

Publications (3)

Publication Number Publication Date
EP0092988A2 EP0092988A2 (de) 1983-11-02
EP0092988A3 EP0092988A3 (en) 1985-05-22
EP0092988B1 true EP0092988B1 (de) 1990-06-20

Family

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EP19830302297 Expired EP0092988B1 (de) 1982-04-24 1983-04-22 Offsetdruck

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EP (1) EP0092988B1 (de)
JP (1) JPS5926264A (de)
DE (1) DE3381677D1 (de)
GB (1) GB2118900B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1216112A (en) * 1982-09-17 1987-01-06 Ronald E. Johnson Collector membrane
GB8822376D0 (en) * 1988-09-23 1988-10-26 Service Eng Ltd Multi-colour off-set printing
FR2705277B1 (fr) * 1993-05-14 1995-08-18 Elmetherm Installation de décoration de pièces, notamment en céramique ou verre, à l'aide de chromos ou de motifs à l'encre et procédé de fonctionnement.
GB9400259D0 (en) * 1994-01-07 1994-03-02 Pilkington Plc Substrate for a magnetic disc and manufacture thereof
WO2010113373A1 (ja) 2009-04-01 2010-10-07 株式会社秀峰 印刷方法および被印刷体
DE102021000892A1 (de) 2021-02-19 2022-08-25 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit bei IR-Beleuchtung transparenten Druckfarben und einem maschinenlesbaren Merkmal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554836A (en) * 1968-07-19 1971-01-12 Minnesota Mining & Mfg Transfer process
CH527699A (de) * 1969-08-02 1972-09-15 Philipp Wilfried Druckverfahren und Vorrichtung zur Durchführung des Druckverfahrens

Also Published As

Publication number Publication date
EP0092988A2 (de) 1983-11-02
JPS5926264A (ja) 1984-02-10
JPH0346307B2 (de) 1991-07-15
EP0092988A3 (en) 1985-05-22
GB2118900A (en) 1983-11-09
GB2118900B (en) 1985-10-23
DE3381677D1 (de) 1990-07-26
GB8311031D0 (en) 1983-05-25

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