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WO1993004872A1 - Procede d'impression sur du metal a l'aide d'encres sublimables - Google Patents

Procede d'impression sur du metal a l'aide d'encres sublimables Download PDF

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Publication number
WO1993004872A1
WO1993004872A1 PCT/US1992/007258 US9207258W WO9304872A1 WO 1993004872 A1 WO1993004872 A1 WO 1993004872A1 US 9207258 W US9207258 W US 9207258W WO 9304872 A1 WO9304872 A1 WO 9304872A1
Authority
WO
WIPO (PCT)
Prior art keywords
transfer sheet
coated surface
printing
substrate
metallic substrate
Prior art date
Application number
PCT/US1992/007258
Other languages
English (en)
Inventor
Gary Truchan
Jack Compton
Original Assignee
Gary Truchan
Jack Compton
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 Gary Truchan, Jack Compton filed Critical Gary Truchan
Publication of WO1993004872A1 publication Critical patent/WO1993004872A1/fr

Links

Classifications

    • 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
    • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
    • B41M5/0355—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic characterised by the macromolecular coating or impregnation used to obtain dye receptive properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers

Definitions

  • the present invention is directed to printing processes and more particularly to printing processes using sublimable .inks.
  • Sublimable inks those inks that go from a solid state directly to a gaseous state, have been around for a number of years.
  • Such inks are commonly used in a process, typically referred to as heat transfer printing, which involves preparing a paper transfer sheet containing the sublimable inks in the pattern to be printed. The paper transfer sheet is pressed against an object to be printed and heated for a brief period of time. The heat causes the ink to sublime and be transferred from the transfer paper to the object being printed. The ink penetrates into the object such that the pattern to be printed is transferred from the transfer paper to the object.
  • heat transfer printing has been limited primarily to the printing of textiles.
  • An example of such a heat transfer printing process is disclosed in U. S. Patent No. 3,363,557 to Blake.
  • the pattern to be printed is deposited onto a heat transfer sheet in any manner as by letterpress, gravure, typing, stamping, hand drawing, etc. Any volatile components of the inks are evaporated and an impression of binder containing sublimable coloring agent is thus produced on the surface of the transfer sheet.
  • the sublimable coloring material in the ink impression is gasified by the application of heat.
  • the gasified coloring material condenses immediately on the adjacent fabric, which is at a slightly lower temperature, to form the desired copy.
  • the coloring material enters the material as a gas and is condensed within it as well as on the surface. In some instances, both sides of the fabric may show a discernable copy of the original.
  • U.S. Patent No. 3,363,557 contains a recitation that various materials such as wood, paper, other cellulosic material, plastics, and even metallic surfaces, have been used to receive the gaseous coloring material, the ability to use sublimated inks with that variety of substrates has posed numerous problems. For example, in ⁇ . S. Patent No. 3,860,388 to Haigh the decoration of fabrics using the heat transfer process is recognized as being well-developed.
  • U. S. Patent No. 3,860,388 is directed to a method to facilitate heat transfer printing onto a plastic substrate.
  • U. S. Patent No. 3,922,445 to Mizuno et al. provides another indication of the difficulties encountered when attempting to expand the different types of substrates that can be printed with sublimated inks. In that patent, it is recognized that because of the use of dispensing dyes as the coloring agent, the kinds of materials that can be heat transfer printed are considerably limited.
  • the fibers which can be colored are principally the synthetic fibers including polyester fibers and triacetate fibers.
  • the fiber which is principally used is the polyester fiber.
  • That patent is directed to expanding the types of substrates which can be used in the heat transfer printing process by using an oxidizing agent to increase the transfer properties of certain basic dyes.
  • the process of that patent is claimed to be used on a wide variety of substrates including metal.
  • the product is subjected to a steam heating or acid steam heating treatment to obtain a clearer image.
  • 3,952,131 to Sideman illustrates yet another example of a patent recognizing that heat transfer printing is used chiefly in the printing of polyester fabrics.
  • Disclosed in that patent is the use of a polyolefin coating extruded over the printing of the transfer paper.
  • the polyolefin coating allows the passage of the gaseous inks while at the same time prevents the transfer paper from sticking to the substrate.
  • that patent claims to be able to print onto embossed sheets of metal.
  • ⁇ . S. Patent No. 4,354,851 to Hix et al. a process is disclosed for using heat transfer printing in conjunction with substrates such as hardboard, particle board, softboard, insulation board, gypsum panel, or a plywood panel.
  • the substrate receives a polymeric coating which provides both water-resistance and a receptor surface for retaining the coloring agent.
  • ⁇ . S. Patent No. 4,395,263 to Davis heat transfer printing is simply not feasible on glass fabric, sheet glass, metal surfaces, marble, or other inorganic materials.
  • the invention disclosed in U. S. Patent No. 4,395,263 facilitates heat transfer printing on those substrates by providing a laminated support stratum comprising a binder layer containing glass fiber and a layer of thermosettable material receptive to sublimable dyestuffs.
  • Decals may contain information such as operating instructions, indicia for indicators, or they may be decorative such as the decals used in glamour panels by the auto industry.
  • the process of printing upon metal substrates may be complicated by the fact that the substrate is often subjected to some additional process step which forms the metallic substrate into the shape of the final product. Because printing on a metal substrate after it has been formed is typically difficult, the use of decals has proliferated.
  • the present invention is directed to a process for printing on a surface of a metallic substrate.
  • the process is comprised of the steps of applying a polymeric coating to a surface of the metallic substrate while the metallic substrate has a substantially flat profile.
  • a transfer sheet is placed on the coated surface.
  • the transfer sheet contains sublimable ink in the form of a pattern to be transferred onto the coated surface.
  • the transfer sheet and coated surface are subjected to temperatures and pressures sufficient to cause the sublimable ink to sublime and become attached to the polymeric coating.
  • the metal substrate may then be subjected to a process which causes the substrate to lose its substantially flat profile.
  • a metallic substrate which has had a polymeric coating applied thereto, ⁇ and thereafter been printed using a sublimable ink, can be bent, formed, -or rerolled, while not adversely effecting the aesthetic appearance of the printed surface.
  • the metal substrate may be subjected to any step which causes it to loose its substantially flat profile without destroying the quality of the printed material.
  • a particular heat transfer printing process has been found to be particularly advantageous for use in conjunction with coated metals such that release agents and post printing steps to clarify the image are not required.
  • a coating containing polyester fibers is applied to a surface of a metallic substrate. An uncoated transfer sheet is placed on the coated surface.
  • the transfer sheet contains sublimable inks in the form of a pattern to be transferred onto the coated surface.
  • the transfer sheet is subjected to temperatures in the range of about 375° F - 390° F while pressing the transfer sheet against the coated surface with pressures in the range of 200 - 500 psi. Thereafter the transfer sheet is removed from the coated surface leaving a crisp image requiring no post printing processing.
  • the two aspects of the present invention solve various problems encountered in the prior art when attempting to heat transfer print sublimable inks onto metal substrates.
  • the first aspect of the invention recognizes that metallic substrates coated with polymeric coatings and then printed with sublimable inks, may thereafter be formed, bent, or rerolled without adversely effecting the quality of the printed material. That represents a substantial breakthrough inasmuch as coils of steel may be printed with the graphics of a particular product and thereafter rerolled for subsequent storage, or cut to size and sent to various machines for forming into the parts necessary for the product.
  • the ability to print on the coil steel while it is flat allows for complex graphics or text to be provided and thereafter the part can be formed into whatever shape necessary without destroying the quality of the graphics or text.
  • the second aspect of the present invention provides for a heat transfer printing process which can involve any number of colors printed in one pass. Because all of the colors can be printed in one pass, the printing process is particularly economical. Additionally, because release agents and post printing processing steps are not required, stunning graphics may be obtained in a very cost effective manner.
  • FIG. 1 illustrates a transfer sheet carrying a pattern to be printed on a surface of a metallic substrate
  • FIG. 2 is a cross-sectional view illustrating a metallic substrate having a substantially flat profile and carrying a primer, a coat of polymeric material, and a top coat;
  • FIG. 3 illustrates a heat transfer press in which the transfer sheet is brought into contact with the coated metallic surface under conditions which cause the pattern to be transferred from the transfer sheet to the coated metallic surface;
  • FIG. 4 Illustrates the metallic substrate after it has lost its substantially flat profile; and FIG. 5 is a side view illustrating the profile of the metallic substrate of FIG. 4.
  • DESCRIPTION OF A PREFERRED EMBODIMENT The present invention is directed to heat transfer printing processes using sublimable inks.
  • a transfer sheet 10, illustrated in FIG. 1 is prepared.
  • the transfer sheet 10 used in the present invention may be prepared in any convention manner. For example, gravure may be used for long runs, flexography for shorter runs, screen printing for very short runs, and off-set lithography for sizable runs on sheet or piece goods.
  • the preferred paper substrate for heat transfer printing according to the present invention is an uncoated, offset grade of paper. Desirable characteristics of that paper include quick dye release, quick setting characteristics, and rub resistance.
  • the transfer paper should be free of pin holes and should exhibit good vapor barrier properties so as to act as an effective barrier to dye vapor during transfer.
  • Many types of transfer papers are commercially available. For example, an uncoated, offset grade of paper is available from Nekoosa, Inc., a subsidiary of Georgia Pacific, Inc. doing business in Arkansas.
  • the transfer sheet 10 is prepared so that the transfer sheet 10 carries a pattern 12 which is to be transferred to the object to be printed.
  • the pattern 12 may be a decoration or design 14, words or numbers 16, or some combination thereof. In short, the pattern 12 may take the form of whatever is to be transferred to the object to be printed.
  • the pattern 12 is formed with known inks containing special sublimable dyes which sublimate upon the application of heat and pressure.
  • known inks containing special sublimable dyes which sublimate upon the application of heat and pressure.
  • One type of ink which has been found to be advantageous in practicing the processes of the present invention are lithotex inks available from Coats Brothers Inks (U.S.A.), Inc., 1511 South Batesville Road, Greer, SC 29650.
  • the lithotex inks are available in several color sets which have been particularly designed for use on fabrics. Those color sets include: a) For polyester and acrylic:
  • a portion of a metallic substrate 18 is illustrated which has a substantially flat profile.
  • a first surface 20 of the metallic substrate 18 is the surface which is to bear the pattern 12 carried by the transfer sheet 10.
  • the first surface 20 is covered with a primer/basecoat 22.
  • the primer 22 may serve as the background for the pattern 12.
  • the primer may have a thickness of .8 mil.
  • a polymeric coating 24 having a thickness of 3/8ths to 3/10ths mils is applied.
  • the polymeric coating may be selected from the group consisting of alkyd-melamine resins, polyester resins, alkyd resins, and acrylic polymers.
  • a polyester resin designated Clear Coat Film 614C1 and 614C7 (Miracoat Clear) and available from Morton International, Inc. has been found to be particularly useful in practicing the present invention.
  • Polymeric coatings may also be obtained from Hanna Corp., Pittsburgh Plate Glass, and Decon Industries.
  • top coat 26 may be applied.
  • the application of the top coat 26 is optional and its use and composition depends upon the particular end product. For example, product supplied to the automotive industry might include a top coat 26 containing ultraviolet blockers whereas products for other industries might not require any top coat.
  • the transfer sheet 10 After the transfer sheet 10 has been prepared and the appropriate coatings applied to the metallic substrate 18, the transfer sheet 10 is then placed on the first surface 20 of the metallic substrate 18 and the transfer sheet and coated surface are subjected to pressures and temperatures sufficient to cause the sublimable inks to sublime. Once the inks have sublimed, they will come into contact with the first surface 20 and become attached to the polymeric coating 22. In that manner, the pattern 12 is transferred from the transfer sheet 10 to the first surface 20.
  • a heat transfer press 28, illustrated in Fig. 3, is a device capable of receiving the metallic substrate 18 and the transfer sheet 10, and holding same in intimate contact while the desired pressures and temperatures are applied.
  • the heat transfer press 28 illustrated in FIG. 3 is a commercially available device which does not form a part of the present invention. For that reason, the heat transfer press 28 will only be briefly described.
  • the heat transfer press 28 may be used for transferring patterns from transfer sheets 10 to individual metallic substrates 18.
  • the heat transfer press 28 includes a base 30 which is covered with a resilient silicon rubber plate 32.
  • the silicon rubber plate 32 provides support for the metallic substrate 18 which is to be printed.
  • Located above the silicon rubber plate 32 is a movable member 34.
  • the moveable member 34 includes a platen 36, the temperature of which may be varied.
  • the platen 36 is attached to a fiberglass insulated heat shield 38.
  • the movable member 34 carries a handle 40 which is used to vary the position of the movable member 34.
  • a member 42 extends between the movable member 34 and a control panel 44.
  • the member 42 functions as a duct for the electrical resistance element used to heat the platen 36 and also for an air pressure line used to provide the pressure exerted by the movable member 34 in pressing the transfer sheet 10 against the metallic substrate 18. Air is supplied to the heat transfer press 28 through a pneumatic coupling 46.
  • the control panel 44 contains the various instruments and controls necessary to control the operation of the heat transfer press 28. Those controls include an on/off indicator lamp 48, an air pressure control knob 50, an air pressure gauge 52, a platen on/off indicator lamp 54, and an automatic reset timer 56. Other controls such as a set temperature control may also be provided.
  • the metallic substrate 18 is positioned on the silicon rubber plate 32 with the first surface 20 facing upward.
  • the transfer sheet 10 is positioned on the first surface 20.
  • the movable member 34 is moved from an open, disengaged position (shown in FIG. 3) to a closed, engaged position (not shown) so as to press the transfer sheet 10 against the first surface 20.
  • the transfer sheet 10 may be pressed against the first surface 20 with a force of approximately 200 - 500 psi.
  • the platen 36 will have been heated to an appropriate temperature.
  • An appropriate temperature for use with the lithotex inks identified above is between 375° F - 390° F. Other inks may require somewhat different temperatures and the recommendations of the manufacturer should be followed.
  • the desired pressure and temperature are maintained for a specific dwell time, typically twenty to forty seconds.
  • the sublimable ink carried by the transfer sheet 10 sublimes. Because of the pressure and close proximity of the metallic substrate 18, the gaseous ink attaches to the polymeric coating.
  • the transfer sheet 10 may be removed from the metallic substrate 18, and the metallic substrate 18 removed from the heat transfer press 28.
  • the pattern carried by the transfer sheet 10 will have been transferred to the first surface 20. The pattern so transferred will be an exact copy which is immediately color fast. No post printing processing steps are required to sharpen the image, cure the image, or the like.
  • the inventors of the present invention have unexpectedly discovered that after the metallic substrate 18 has been printed, the metal substrate 18 may be bent, formed, or otherwise subjected to a process which causes it to lose its substantially flat profile without effecting the quality of the pattern transferred thereto.
  • the type of post printing processing step that might be performed is virtually unlimited. For example, if the printing has been performed on a coil of steel, the coil of steel could be rerolled. If the printing has been performed on a discrete piece of metal, that metal could be formed into a panel 58 illustrated in FIGS. 4 and 5. Such panels can be used in the automotive industry as glamour panels. Any process step which results in the panel losing its substantially flat profile could be employed.
  • the present invention thus has two distinct aspects.
  • One aspect of the invention involves the discovery that heat transfer printing of sublimable inks onto metal substrates having polymeric coatings can be rolled, formed, or otherwise processed in a manner which causes the substrate to lose its substantially flat profile without degradation of the quality of the transferred pattern.
  • the other aspect of the present invention involves the use of a particular polymeric coating, one including polyester fibers, at specific temperatures (375° F to 390° F) and specific pressures (200 - 500 psi) which results in a crisp image without the use of post printing processing steps and which eliminates the need for releasers, intermediate coatings, and the like.
  • the disclosed process represents a very economical process for printing a multitude of colors on metal in a single pass.
  • metallic substrates have been printed according to one aspect of the present invention and then subjected to a post printing, forming process which caused the metallic substrates to loose their flat profiles according to the other aspect of the invention.
  • the metallic substrates printed included painted aluminum, coated steel, anodized aluminum, and coated and anodized brass.
  • the coated steel panels where formed into glamour panels suitable for use in the automotive industry as shown in FIGS. 4 and 5.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)

Abstract

Procédé d'impression sur une surface (20) d'un substrat métallique (18) dans lequel on applique une première couche/imprimure (22) et un revêtement polymère (24), sur ladite surface (20) du substrat métallique (18) qui est relativement plate. On place une feuille de transfert (10) sur la surface recouverte (24), cette feuille de transfert (10) contenant de l'encre sublimable sous forme d'un motif (12) qu'on désire transférer sur la surface recouverte (24). On soumet la feuille de transfert (10) et la surface recouverte (24) à des températures et des pressions suffisantes pour que l'encre sublimable se sublime et adhère au revêtement polymère (24). On enlève ensuite la feuille de transfert (10) et on soumet le substrat métallique (18) à un traitement qui lui fait perdre presque tout son aspect plat. Suivant l'application désirée, on peut ajouter une couche de revêtement de surface (26).
PCT/US1992/007258 1991-08-28 1992-08-27 Procede d'impression sur du metal a l'aide d'encres sublimables WO1993004872A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75141691A 1991-08-28 1991-08-28
US751,416 1991-08-28

Publications (1)

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WO1993004872A1 true WO1993004872A1 (fr) 1993-03-18

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WO (1) WO1993004872A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734880A1 (fr) * 1995-03-28 1996-10-02 Zippo Manufacturing Company Méthode pour l'impression sur substrats métalliques par transfert par la chaleur et produits ainsi fabriqués
GR1002648B (el) * 1996-05-31 1997-03-17 �������-������� ����������� & ��� �.�.�. Μεθοδος με την οποια επιτυγχανεται απομιμηση παντος τυπου σχεδιου επι μεταλλικων επιφανειων μετα του αναλογου μηχανολογικου εξοπλισμου.
EP1055524A1 (fr) * 1999-04-07 2000-11-29 Comital S.p.A. Procédé pour décorer des pièces métalliques
ES2190835A1 (es) * 2000-03-31 2003-08-16 Fernandez Julio Munoz Instalacion para procesos de decoracion de perfiles metalicos.
ES2192902A1 (es) * 2000-06-16 2003-10-16 Fernandez Julio Munoz Instalacion para procesos de decoracion de perfiles metalicos.
ES2192922A1 (es) * 2001-01-26 2003-10-16 Desarrollos De Impresion S L Procedimiento de impresion sobre superficies no porosas
GB2357262B (en) * 1999-12-18 2003-11-12 Gardeners Digital Ltd Method and apparatus for sublimation printing of metal panels
WO2009115423A1 (fr) * 2008-03-19 2009-09-24 Monica Camanini Procédé de revêtement par sublimation de surfaces métalliques revêtues de zinc
EP2420334A4 (fr) * 2008-12-04 2013-03-06 Jae Bong Son Procédé pour la production d'un récipient de cuisson pouvant être imprimé en plus d'une couleur, et gabarit pour dispositif d'impression utilisé avec ledit
US9809054B2 (en) 2012-04-19 2017-11-07 Kohler Co. Decorated rigid panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012831A1 (fr) * 1978-12-22 1980-07-09 Howard A. Fromson Procédé pour la décoration d'aluminium anodisé
EP0060107A2 (fr) * 1981-03-10 1982-09-15 British Steel Corporation Impression par transfert
EP0070643A2 (fr) * 1981-07-14 1983-01-26 METAL BOX p.l.c. Décoration de récipients métalliques
EP0128717A1 (fr) * 1983-06-13 1984-12-19 METAL BOX p.l.c. Décoration de matériaux substrats
DE4011215A1 (de) * 1989-04-13 1990-10-18 Lavezzari S P A Verfahren und anlage zum kontinuierlichen lackieren und dekorieren von metallwalzerzeugnissen und so hergestelltes walzerzeugnis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012831A1 (fr) * 1978-12-22 1980-07-09 Howard A. Fromson Procédé pour la décoration d'aluminium anodisé
EP0060107A2 (fr) * 1981-03-10 1982-09-15 British Steel Corporation Impression par transfert
EP0070643A2 (fr) * 1981-07-14 1983-01-26 METAL BOX p.l.c. Décoration de récipients métalliques
EP0128717A1 (fr) * 1983-06-13 1984-12-19 METAL BOX p.l.c. Décoration de matériaux substrats
DE4011215A1 (de) * 1989-04-13 1990-10-18 Lavezzari S P A Verfahren und anlage zum kontinuierlichen lackieren und dekorieren von metallwalzerzeugnissen und so hergestelltes walzerzeugnis

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734880A1 (fr) * 1995-03-28 1996-10-02 Zippo Manufacturing Company Méthode pour l'impression sur substrats métalliques par transfert par la chaleur et produits ainsi fabriqués
GR1002648B (el) * 1996-05-31 1997-03-17 �������-������� ����������� & ��� �.�.�. Μεθοδος με την οποια επιτυγχανεται απομιμηση παντος τυπου σχεδιου επι μεταλλικων επιφανειων μετα του αναλογου μηχανολογικου εξοπλισμου.
EP0810102A1 (fr) * 1996-05-31 1997-12-03 "Proteco" Christos Sklavenitis & CIA EPE Procédé pour imprimer sur barres en aluminium utilisant des encres sublimables
EP1055524A1 (fr) * 1999-04-07 2000-11-29 Comital S.p.A. Procédé pour décorer des pièces métalliques
GB2357262B (en) * 1999-12-18 2003-11-12 Gardeners Digital Ltd Method and apparatus for sublimation printing of metal panels
ES2190835A1 (es) * 2000-03-31 2003-08-16 Fernandez Julio Munoz Instalacion para procesos de decoracion de perfiles metalicos.
ES2192902A1 (es) * 2000-06-16 2003-10-16 Fernandez Julio Munoz Instalacion para procesos de decoracion de perfiles metalicos.
ES2192922A1 (es) * 2001-01-26 2003-10-16 Desarrollos De Impresion S L Procedimiento de impresion sobre superficies no porosas
WO2009115423A1 (fr) * 2008-03-19 2009-09-24 Monica Camanini Procédé de revêtement par sublimation de surfaces métalliques revêtues de zinc
EP2420334A4 (fr) * 2008-12-04 2013-03-06 Jae Bong Son Procédé pour la production d'un récipient de cuisson pouvant être imprimé en plus d'une couleur, et gabarit pour dispositif d'impression utilisé avec ledit
US9809054B2 (en) 2012-04-19 2017-11-07 Kohler Co. Decorated rigid panel
US9956704B2 (en) 2012-04-19 2018-05-01 Kohler Co. Decorated rigid panel

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