A Method and Apparatus for Printing a Graphic on Fabric
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Patentamt Europaisches || || 1 1| || || ||| 1 1 1| || ||| || || (19) J European Patent Office Office europeen des brevets (11) EP 0 732 440 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) int. CI.6: D06P 5/00, B41J 2/325, 18.09.1996 Bulletin 1996/38 B41 M 5/33 B41 M 5/035 (21) Application number: 96103008.7 (22) Date of filing: 28.02.1996 (84) Designated Contracting States: (72) Inventor: Price Peterson, Mary Elizabeth DE FR GB IT Delmar, New York 1 2054 (US) (30) Priority: 13.03.1995 US 404192 (74) Representative: Schaumburg, Thoenes & Thurn Postfach 86 07 48 (71) Applicant: Gerber Scientific Products, Inc. 81634 Munchen (DE) Manchester, CT 06040 (US) (54) A method and apparatus for printing a graphic on fabric (57) A method for printing a graphic on fabric using on only those portions of the fabric covered by the a thermal transfer printer is disclosed. According to the graphic. Thermal transfer ribbons for carrying out the invention, a colorant which forms the graphic and a method of printing are also disclosed. binder for adhering the colorant to the fabric are printed ^12 £l8 digitizer! MEMORYl 20 CONTROLLER PRINTER FIG. 1 I PRESS I ! < O CM CO r»- o 0_ LU Printed by Rank Xerox (UK) Business Services 2.13.4/3.4 1 EP 0 732 440 A1 2 Description those areas corresponding to the print area of the graphic. Background of the Invention It is yet another object of the invention to provide an apparatus for carrying out such a process. The present invention relates to printing graphics, 5 such as alphanumeric symbols, designs, logos and Summary of the Invention other artwork, on fabric. More particularly, the present invention relates to printing graphics on fabric using a The present invention meets these objects by pro- thermal transfer printer. viding, in one aspect, a method for printing a graphic on Typically, graphics are printed on fabric using a 10 fabric using a thermal transfer printer having a first rib- thermal transfer process. In such a process a thermal bon including a carrier layer and a layer of binder sup- transfer ribbon, including a colorant layer of pigment dis- ported on the carrier layer, and a second ribbon persed in a wax, resin or wax-resin vehicle, is used to including a carrier layer and a layer of a colorant sup- print the desired graphic onto a thermally stable sub- ported on the carrier layer. The thermal printer is pro- strate, such as thermal paper, coated with a resin 15 vided with data defining the graphic to be printed on the binder. The printed paper is then placed print side down fabric, and the printer is activated to print binder with the on the fabric, and the colorant is transferred to the fabric first ribbon onto a thermally stable substrate according in a press by the application of heat and pressure. The to the data. Thus, a print area including the binder and resin binder is also transferred, and the resin binds the an adjacent non-print area without binder are formed on colorant to the fabric. 20 the substrate. Once the binder has been deposited on Generally, the printed graphic is defined by one or the substrate, the printer is activated to print colorant more print areas covered by the colorant and adjacent with the second ribbon onto the print area of the sub- "white" or non-print areas. However, since the entire strate according to the data. In the final step of the surface of the thermal paper is coated with the binder, method, the graphic is printed on the fabric by thermally binder transfers to the fabric throughout this adjacent, 25 transferring the binder and colorant from the substrate non-print area, as well as in the areas covered by the to the fabric and adhering the colorant to the fabric with colorant. The binder gives the non-print areas of the fab- the binder. ric an undesirable hand or texture and also seals the In the preferred embodiment of this aspect of the fabric weave together, which prevents the free passage invention, the printer has a single ribbon including a car- air and moisture through the fabric in the non-print 30 rier layer, a colorant layer supported on the carrier layer, areas. Further, the resin binder is not transparent and and a binder layer overlying the colorant layer. Accord- leaves a shadow around the graphic. The resin shadow ingly, the steps of printing the binder and printing the is particularly noticeable on colors other than white. colorant are performed simultaneously using the single Thus, the above-described method of printing is gener- ribbon. ally limited to use with white fabrics. 35 According to a second aspect, the invention pro- According to an alternative process, typically used vides a method for printing a graphic directly on fabric in in most high volume applications, the thermal transfer is which the steps of printing the binder and colorant on a prepared by screen printing or lithographically printing a thermally stable substrate and then thermally transfer- desired graphic onto a thermally stable substrate. Since ring the binder and colorant to the fabric are eliminated. both processes employ inks instead of the pigmented 40 The method taught by this aspect of the invention uti- wax or resin compounds described above in connection lizes a thermal transfer printer having a first ribbon with thermal transfer ribbons, the resin binder and its including a carrier layer and a layer of colorant sup- associated disadvantages are eliminated. However, ported on the carrier layer, and a second ribbon includ- screen printing and lithographic printing, are labor inten- ing a carrier layer and layer of binder supported on the sive processes requiring artwork, ink mixing, color sep- 45 carrier layer. The printer is provided with data defining aration, printing screens or color separation films, a UV the graphic to be printed on the fabric, and the printer is exposure step, and the use of emulsions, developers activated to print colorant with the first ribbon onto the and other chemicals in addition to the inks. Moreover, fabric according to the data. Thus, a print area including the prepared screens or films can be use to print single the colorant and an adjacent non-print area absent any size designs only. so colorant are formed on the fabric. The printer is then It is, therefore, an object of the invention to provide activated to print binder with the second ribbon onto the a method for printing graphics on fabric which requires print area of the fabric according to the data to bind the less labor and equipment than screen printing or litho- colorant to the fabric. graphic printing and which does not require the inks and In the preferred embodiment of this second aspect other chemicals used in these processes. 55 of the invention, the thermal printer has a single ribbon It is a further object of the invention to provide a including a carrier layer, a binder layer supported on the method wherein the graphic is printed using a thermal carrier layer, and a colorant layer overlying the binder printer and the final product is coated with binder in only layer. Accordingly, the steps of printing the binder and 2 3 EP 0 732 440 A1 4 printing the colorant are performed simultaneously Hobart-Macintosh, Inc., Elk Grove Villiage, II., under the using the single ribbon. trade designation "SOFTtrans", coated with a paraffin- The invention is useful for printing graphics, either based wax, or a polyethylene coated paper available directly or by means of a transfer, on a wide variety of from, for example, Lamart Corp., Clifton, NJ. fabrics including cotton, polyester, cotton-polyester s As the thermal paper passes over the platen 24, the blends, wool, nylon, silk, rayon and rayon-polyester print head is pressed downwardly onto the paper and blends. The only limitation with respect to the fabric is generally establishes a linear zone of contact between that the fabric must have sufficient thermal stability to the paper and the platen. A cassette 28 supplies a ther- withstand either the heat and pressure of the transfer mal transfer ribbon 30 which carriers a colorant and a press, or the heat of the thermal printer where the to binder. The ribbon 30 extends from a supply roll 32, graphic is printed directly on the fabric. Moreover, since between the print head 26 and the platen 24, to a take- binder is applied only to the print area of the fabric up roll 34 of the cassette. Thus, as the print head 26 according to the invention and the resin shadow typical presses down on the platen 24 with the thermal paper of the prior art is eliminated, the invention can be used and ribbon 30 interposed therebetween, the colorant with fabric of any color. ts and binder carried by the ribbon are transferred to the paper according to the data defining the graphic. Brief Description Of The Drawings A more complete description of the printer 16 may be found in coassigned patent application Serial No., Fig. 1 is a schematic diagram illustrating a system 08/007,662, filed on January 22, 1993, the disclosure of for printing graphics on fabric according to the present 20 which is incorporated herein by reference. It should be invention. understood, however, that the present invention is in no Fig. 2 is a schematic side view of a thermal printer way limited in this regard and that any one of a wide for use in the system shown in Fig.