WO2021030851A1 - Papier transfert pour procédés d'impression par sublimation de colorants, et procédé de production de papier transfert - Google Patents

Papier transfert pour procédés d'impression par sublimation de colorants, et procédé de production de papier transfert Download PDF

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Publication number
WO2021030851A1
WO2021030851A1 PCT/AT2020/060305 AT2020060305W WO2021030851A1 WO 2021030851 A1 WO2021030851 A1 WO 2021030851A1 AT 2020060305 W AT2020060305 W AT 2020060305W WO 2021030851 A1 WO2021030851 A1 WO 2021030851A1
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WO
WIPO (PCT)
Prior art keywords
weight
paper
paper web
transfer paper
transfer
Prior art date
Application number
PCT/AT2020/060305
Other languages
German (de)
English (en)
Inventor
Mario DONNER
Martin Spitzbart
Kari-Pekka INNO
Original Assignee
Mondi Ag
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 Mondi Ag filed Critical Mondi Ag
Priority to EP20775165.2A priority Critical patent/EP4013913B1/fr
Publication of WO2021030851A1 publication Critical patent/WO2021030851A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • 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
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/003—Transfer printing
    • D06P5/004—Transfer printing using subliming dyes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/02—Dye diffusion thermal transfer printing (D2T2)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/30—Thermal donors, e.g. thermal ribbons
    • 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
    • B41M5/0256—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet the transferable ink pattern being obtained by means of a computer driven printer, e.g. an ink jet or laser printer, or by electrographic means

Definitions

  • the invention relates to a method for producing transfer paper for thermal sublimation printing processes, a transfer paper for thermal sublimation printing processes and a method for printing textiles.
  • Transfer printing processes are primarily used to apply printed images to objects, which objects cannot be printed, or can only be printed to a very limited extent, or with great effort.
  • a (negative) print image is first printed on a transfer paper, and then transferred to a substrate with heating and, if necessary, pressure.
  • the printing inks used in transfer printing processes include sublimable color components, which can be transferred from the transfer paper onto or into the substrate actually to be printed by the heating and pressure.
  • the transfer paper can in principle be printed on the transfer paper in a contactless manner, for example by means of inkjet printing, or by means of contact printing methods, such as rotary screen printing. Transfer printing is usually used for printing substrates which, for example, have a polyester coating, or textiles suitable for this purpose.
  • transfer printing Since in transfer printing, the print image is first printed on a transfer paper and only then transferred to the substrate actually to be printed, the transfer paper has to meet special requirements that cannot be met, or only very poorly, by conventional printing paper intended for printing. In addition to good printability, transfer paper also requires the most complete and qualitatively best possible transfer of the print image to the substrate to be printed. In this case, on the one hand, a high transfer efficiency for the transfer of the printing ink (s) but also a transfer of the printed image applied to the transfer paper that is as true to contrast or as true to the contour as possible is desired.
  • a transfer paper should be easy to print on the one hand, but on the other hand an applied print image or the sublimation dyes used for this purpose should be released or transferred as completely and true to the image as possible to the substrate to be printed when using heat and pressure. 2
  • the object of the present invention was, on the one hand, to provide a method for producing a transfer paper for thermal sublimation printing processes, by means of which transfer paper with good transfer printing properties can be produced in high quality, but nevertheless cost-effectively, in large quantities.
  • Another object of the invention was to provide a transfer paper for thermal sublimation printing processes with improved properties, as well as a method for printing textiles using a corresponding transfer paper.
  • the object of the invention is achieved on the one hand by a method for producing a transfer paper according to the corresponding claims.
  • the process for the production of transfer paper for dye-sublimation printing processes comprises the process steps a) providing a cellulose or an aqueous cellulose suspension, b) making a suspension of the cellulose in water with a water content of at least 90% by weight, c) optionally adding it from additives, fillers or process chemicals to the aqueous - 3 -
  • Suspension d) dewatering the suspension to a water content of 60% by weight to 85% by weight using a wire section, e) drying the dewatered suspension to form a paper web with a water content of 30% by weight to 55% by weight using a press section, f) further drying of the paper web to a water content of 1% by weight to 10% by weight by means of a dryer section, g) coating at least one of the surfaces of the paper web by means of a coating device by applying an aqueous solution of a modified starch, which starch is cationically modified and has a degree of substitution by cationic groups of 0.03 to 0.6 mol / mol, h) post-drying the coated paper web by means of a further dryer section or post-dryer section to a water content of 3% by weight to 7% by weight, i) making up the coated and post-dried paper web.
  • a coating device by applying an aqueous solution of a modified starch, which starch is cationically
  • the specified procedural measures or steps enable high-quality transfer paper to be produced in a continuous process in an economically sensible manner and in large quantities.
  • a separate work step for applying a coating such as by means of doctor blades as indicated in the prior art, can be eliminated here.
  • the method for producing transfer paper can be provided for thermal sublimation printing processes in which the transfer paper is printed by means of digital inkjet printing.
  • the coating takes place in-line in the process and the backing paper or the paper web with the applied coating is treated together in the process, in particular dried to a desired water content, a composite material with particularly good adhesion properties of the layers can also be achieved which, and are produced with particularly good coating quality. Delamination phenomena or the formation of imperfections in the coating, which in use can, for example, have negative effects on the quality of the print image, can be effectively prevented.
  • the specified coating is comprehensively the modified one
  • a transfer paper produced by means of the specified process measures is characterized by particularly good properties when used in thermal sublimation printing processes. Due to the special coating, the transfer paper has, on the one hand, good printability, i.e. good absorption of the sublimation printing dyes or pigments, but surprisingly, on the other hand, above all good release properties in the course of a thermal sublimation printing process, i.e. when the printing dyes or pigments are transferred to a substrate by sublimation , on.
  • the coated transfer paper prevents the sublimation dyes from penetrating the reverse side of the transfer paper and the associated loss of sublimation dyes for a sublimation printing process, during and after printing the transfer paper and also during the transfer printing process.
  • the coating can, for example, consist of more than 90% by weight of the modified starch, but can, for example, contain small amounts of impurities caused by production or otherwise, as well as additives customary in paper technology in small amounts.
  • starch of any kind or obtained from different sources can be used, for example potato, wheat or corn starch can be used for the aqueous solution.
  • the cationic modification can provide good solubility of the starch in water.
  • an improved coating of the paper web can be achieved through the cationic modification of the starch and, above all, good adhesion of the coating to the paper web can be provided.
  • this contributes to particularly good properties of the composite, including good mechanical properties and also high resistance to damage, even during the high stresses involved in a dye-sublimation printing process.
  • a suitable, cationically modified starch the product Licocat P from Südstarkke GmbH is mentioned at this point.
  • an improved transfer paper can be made available through the use of the cationically modified starch for the coating as well as through the specific sequence of the process steps.
  • the targeted influencing of the water content of both the paper substrate and the paper web as well - 5 - the targeted setting of a water content of the coated paper web at the end of the process can be essential.
  • a suspension of the pulp in water with a water content of 90% by weight to 99.5% by weight can be produced, which is then successively converted into a paper web with optimal water content for coating in accordance with the specified process sequence
  • Process step g) is dried or converted.
  • the coated paper web is then specifically dried to the specified water content of 3% by weight to 7% by weight.
  • a transfer paper can be produced which is particularly well suited for thermal sublimation printing, as will be explained in more detail below on the basis of exemplary embodiments.
  • a starch modified in this way has proven to be particularly well suited for producing the coating of the transfer paper. Furthermore, a transfer paper with such a coating has particularly good properties when used in dye-sublimation printing processes.
  • process step f) the paper web is dried to a water content of 2.5% by weight to 10% by weight, and in process step g) the aqueous solution of the cationically modified starch is dried using a size press is applied to at least one surface of the paper web.
  • the coating can be done on a paper web with a high water content.
  • the aqueous solution of the cationically modified starch is not applied to both surfaces of the paper web, but that in process step g) the aqueous solution of the modified starch is applied 6 one surface of the paper web is applied and an aqueous solution which contains 5% by weight to 15% by weight of an enzymatically degraded starch is applied to the other surface of the paper web.
  • the surface of the transfer paper intended for thermal sublimation printing is formed by that surface which is coated with the cationically modified starch. That surface of the transfer paper to which the aqueous solution of the enzymatically degraded starch was applied represents the reverse side of the transfer paper.
  • the surface of the transfer paper coated with the cationically modified starch is printed and is also this in the course of a thermal sublimation printing process Surface with the one to be printed
  • Substrate for example textile in contact.
  • One of the advantages of this procedural measure is that inexpensive production of the transfer paper can be provided without having to accept significant losses when used for dye-sublimation printing processes. Furthermore, a transfer paper produced in this way is distinguished by good durability and good mechanical properties.
  • the paper web is dried to a water content of 1.2 wt.% To 2.0 wt.%
  • the aqueous solution of the cationically modified starch is dried by means of a film press is applied to at least one surface of the paper web.
  • the aqueous solution of the modified starch is not applied directly to at least one surface of the paper web, but can be applied beforehand to one or two application rollers of the film press in the desired layer thickness.
  • the layer can then be transferred from the applicator roller (s) to the paper web.
  • the application or coating by means of such a film press is particularly suitable for high throughput of the paper web, and is also advantageous with regard to controlling the layer thickness.
  • step g) the aqueous solution of the cationically modified starch is applied to one surface of the paper web and an aqueous solution containing 5% to 15% by weight is applied to the other surface of the paper web % By weight of an enzymatically degraded starch is applied. - 7 -
  • an embodiment of the method can be expedient in which in method step g) an aqueous solution having a concentration of the cationically modified starch of 5% by weight to 20% by weight is applied to at least one surface of the paper web.
  • An aqueous solution with a concentration of the modified starch in the specified% by weight range has proven particularly suitable for coating at least one surface of the paper web. This is at least largely independent of the type of implementation of the coating.
  • very homogeneous coatings can be produced by means of aqueous solutions in the specified% by weight range, and the formation of voids or, for example, microcracks in the coating, in particular during the drying in process step h) can be prevented.
  • the coating which comprises the cationically modified starch, can be given a layer thickness that is particularly well suited for thermal sublimation printing processes.
  • an upper limit is given for the layer thickness, which is still expedient in terms of an economically sensible production of the transfer paper.
  • the method can also provide that in method step h) a water content of the coated paper web of 4% by weight to 6% by weight is set.
  • the object of the invention is also achieved by a transfer paper for thermal simulation printing processes.
  • the corresponding transfer paper can, in particular, be produced according to a method for producing transfer paper for thermal sublimation processes using the method measures specified above. 8th
  • the transfer paper comprises a paper substrate with a basis weight of 40 g / m 2 to 160 g / m 2 .
  • the paper substrate can predominantly comprise cellulose fibers, and the paper substrate can also contain other constituents, such as lignin or hemi-celluloses, or additives and fillers customary in paper technology.
  • At least one surface of the paper substrate is provided with a coating at least predominantly consisting of a modified starch, which starch is cationically modified and has a degree of substitution by cationic groups of 0.03 to 0.6 mol / mol.
  • the transfer paper has a water content of 3% by weight to 7% by weight.
  • a transfer paper produced by means of the specified process measures is characterized by particularly good properties when used in dye-sublimation printing processes.
  • the special coating has, on the one hand, good printability, that is to say good absorption of the sublimation printing dyes or pigments and, in addition, good release properties in the course of a
  • Dye sublimation printing process The water content in the specified range also has an advantageous effect.
  • the transfer paper can be provided for thermal sublimation printing processes in which the transfer paper is printed by means of digital inkjet printing.
  • the coating consists at least predominantly of a starch cationically modified with quaternary ammonium groups.
  • starch modified in this way has proven to be particularly easy to process.
  • a transfer paper with a coating comprising a starch modified in this way has particularly good properties when used in thermal sublimation printing processes.
  • the coating has a weight per unit area of 0.2 g / m 2 to 4 g / m 2 . - 9 -
  • a basis weight or a layer thickness in the specified range has proven to be particularly well suited for dye-sublimation printing processes. Above all, a layer thickness selected from this range appears to be suitable in order to prevent too large a quantity of sublimation printing dyes or pigments from penetrating into the underlying paper substrate.
  • the specified range indicates an upper limit for the basis weight, which is still expedient in terms of an economically sensible production of the transfer paper.
  • the transfer paper has a water content of 4% by weight to 6% by weight. In this way, a transfer paper can be provided which has further improved properties with regard to a thermal sublimation printing process.
  • an embodiment of the transfer paper can be expedient which has a water absorbency according to Cobb according to ISO 535 of 20 g / m 2 to 35 g / m 2 .
  • Such a transfer paper has proven to be particularly well suited primarily with regard to the absorption of sublimation printing dyes or pigments, but also with regard to their re-release in the course of a thermal sublimation process.
  • the object of the invention is also achieved by a method for printing textiles.
  • the method comprises the production of a negative print image on a transfer paper using sublimation printing dye (s) and the transfer of the print image to a textile substrate using a thermal transfer press.
  • a transfer paper is used, which is designed as described above and below.
  • Such a transfer paper can be used to provide textiles with printed images of particularly high quality, in particular high contour accuracy, high contrast and good color density.
  • provision can preferably be made for the negative print image to be produced on the transfer paper by means of digital inkjet printing.
  • FIG. 1 shows an exemplary embodiment for a method step d) for the apparatus-related dewatering of a suspension of a cellulose by means of a wire section;
  • FIG. 2 shows an exemplary embodiment for a method step e) for further, apparatus-based dewatering of the suspension to form a paper web by means of a press section;
  • FIG. 3 shows an exemplary embodiment for a method step f) for the further, apparatus-based drying of the paper web by means of a drying section;
  • 4 shows an exemplary embodiment for a method step g) for coating the dried paper web by means of a coating device
  • 5 shows a further exemplary embodiment for a method step g) for coating the dried paper web by means of a coating device
  • FIG. 6 shows an exemplary embodiment for a method step i) for making up a coated and dried paper web
  • FIG. 7 shows an exemplary embodiment of a transfer paper for thermal sublimation printing processes
  • FIG. 8 shows an exemplary embodiment of a method for printing textiles.
  • a pulp or an aqueous pulp suspension is provided in a first method step a).
  • the pulp can be used as is known per se 11 and in the case of printable papers usually consist predominantly of cellulose, although other components, for example lignin or hemicelluloses from the manufacture of the cellulose, or additives and impurities may also be included in small amounts.
  • cellulose can be dried or made available as an aqueous suspension.
  • step b) a suspension of the cellulose in water with a water content of at least 90% by weight, wherein the water content of this cellulose suspension can be up to 99.5% by weight. This is based on 100% by weight of the suspension of the pulp in water.
  • step c) additives, fillers or process chemicals can also be added to the aqueous pulp suspension.
  • additives customary in paper technology can be added to the aqueous pulp suspension.
  • the next method step d) is dewatering of the suspension 1 by means of a wire section 2.
  • a wire section 2 can have a circulating wire 3, with The aqueous pulp suspension 1 carries onto a surface 4 of the screen 3. The other surface 5 of the screen 3 can be guided over the dewatering means 6 of the screen section 2 with each revolution of the screen 3.
  • Such drainage means can be formed, for example, by drainage and / or suction strips.
  • dewatering in a wire section can be carried out with the aid of gravity.
  • FIG. 1 shows that dewatering in a wire section can be carried out with the aid of gravity.
  • the dewatering of the suspension 1 can be supported by applying a negative pressure to the surface 5 of the screen 3 facing away from the pulp suspension 1 by means of a negative pressure device 7.
  • the aqueous suspension of the pulp in water is adjusted or dehydrated in the process step d) illustrated in FIG. 1 to a water content of 60% by weight to 85% by weight.
  • step e) the dehydrated Sus pension 1 is dried to form a paper web 8 by means of a press section 9, as is also illustrated schematically in FIG.
  • the pulp suspension 1 pre-dewatered in process step d) can for this purpose be passed between at least two rollers 10 of the press section and dried under high pressure between the rollers 10 to form the paper web 8. 12 den.
  • the press section can also have further pairs of rollers for this purpose.
  • the drying of the suspension 1 to form the paper web 1 can be additionally supported by means of absorbent support material, such as felt mats 11 illustrated in FIG. 2.
  • the aqueous suspension 1 from process step d) is dried to form a paper web 8 with a water content of 30% by weight to 55% by weight.
  • a further drying of the paper web 8 from process step e) is carried out by means of a drying section 12, as is again illustrated in a highly schematic manner in FIG. 3.
  • a drying section 12 can, as shown, comprise numerous rotating drying cylinders 13 over which the paper web 8 can be guided.
  • the drying cylinders can be directly heated.
  • heating channels not shown in detail in FIG. 3 can be formed in the dry cylinder 13, through which a heating medium, for example water vapor, can be passed.
  • electrical resistance heaters are also basically conceivable.
  • a temperature of the drying cylinder 13 can, for example in the exemplary embodiment shown in FIG.
  • drying section 12 can also have other aids, such as screen webs 15, 16 guided over deflection rollers 14. With such screen webs 15, 16 direct contact of the paper web 8 with the hot drying cylinders 13 can be avoided.
  • process step f) the paper web 8 is dried by means of the drying section 12 to a water content of 1% by weight to 10% by weight.
  • a process step g at least one of the surfaces 17 of the paper web 8 dried in process step f) is coated by means of a coating device 18.
  • Two alternative solutions for coating at least one of the two surfaces 17 of the paper web 8 are shown in FIGS 4 and 5, and who will be explained in more detail below.
  • the coating is carried out in process step g) by applying an aqueous solution (19) of a modified starch.
  • the starch is cationically modified and has a degree of substitution by cationic groups of 0.03 to 0.6 mol / mol.
  • cationically modified potato, wheat or corn starch can be used for the process.
  • aqueous solution 19 of a starch cationically modified with quaternary ammonium groups is used.
  • a first embodiment for performing the Beschich device of the paper web 8 is shown very schematically.
  • the aqueous solution 19 of the cationically modified starch can be applied to at least one surface 17 of the paper web 8 by means of a size press 20.
  • the paper web 8 is dried to a water content of 2.5% by weight to 10% by weight.
  • the paper web 8 can be passed between two application rollers 21 by means of a size press 20 as illustrated in FIG. 4, with the aqueous solution 19 of the modified starch for coating between the at least one surface 17 of the paper web 8 and the this surface 17 can be introduced directly associated application roller 21.
  • the aqueous solution of the cationically modified starch is applied to an upper surface 17 of the paper web 8 and to the other surface 22 of the paper web 8 aqueous solution 23, which contains 5% by weight to 15% by weight of an enzymatically degraded starch, is applied.
  • the aqueous solution 23 of the enzymatically degraded starch can be introduced between the surface 22 and the application roller 21 directly associated with this surface 22.
  • Corresponding enzymatically degraded starches and the methods for obtaining such starches are known per se and can be obtained, for example, by boiling wheat or corn starch in an aqueous solution which contains the corresponding degradation enzymes, as described, for example, in Be Miller, JN, & Whistler, RL (2009). Starch: Chemistry and Technology (3rd Edition). Academic Press is described.
  • the enzymatic degradation serves primarily to lower the molecular weight of the starch and the associated lowering of the viscosity in order to make the starch easier to process.
  • A-amylase is known as an example of a degradation enzyme.
  • FIG. 5 an alternative exemplary embodiment for carrying out the coating of the paper web 8 is shown.
  • the - 14 - Aqueous solution 19 of the cationically modified starch can be applied to at least one surface 17 of the paper web 8 by means of a film press 24.
  • provision can then be made for the paper web 8 to be dried to a water content of 1.2% by weight to 2.0% by weight in method step f) carried out directly beforehand.
  • the paper web 8 can be passed between two stripping rollers 25 by means of a film press 24. In this case, as can be seen from FIG.
  • the aqueous solution 19 of the cationically modified starch is applied beforehand in a specifically set layer thickness to the stripping roller 25 assigned to the at least one surface 17 of the paper web 8, and from this stripping roller 25 to the at least one surface 17 transferred to the paper web.
  • the aqueous solution of the cationically modified starch is applied to one surface 17 of the paper web 8 and an aqueous solution 23, to the other surface 22 of the paper web 8, which contains 5% by weight to 15% by weight of an enzymatically degraded starch is applied.
  • the aqueous solution 23 of the enzymatically degraded starch can, as can be seen from FIG. 5, firstly be applied to the stripping roller 25 directly assigned to this surface 22 of the paper web 8 and then transferred to the surface 22.
  • aqueous solution 19 of the cationically modified starch Regardless of the type of application of the aqueous solution 19 of the cationically modified starch or the method used for this purpose, it can be provided that in method step g) an aqueous solution 19 having a concentration of the cationically modified starch of 5% by weight to 20% by weight is applied to at least one surface 17 of the paper web 8.
  • an amount of 0.5 g / m 2 to 20 g / m 2 of the aqueous solution 19 of the cationically modified starch can be applied to at least one surface 17 of the paper web 8.
  • an aqueous solution 19 of the cationically modified starch is applied to both surfaces 17, 22 of the paper web 8.
  • the aqueous solution 19 of the modified starch is only applied to one surface 17 of the paper web - 15 - is applied, and only water or no fluid at all is applied to the other surface 22 of the paper web 8.
  • the coated paper web 8 is post-dried by means of a further drying section 12 or post-dryer section 12.
  • a further drying section 12 or post-dryer section 12 Such post-drying of the coated paper web 8 by means of an post-dryer section 12 can be performed in Principle analogous to the drying already illustrated in FIG. 3 by means of the drying section 12 shown, or a corresponding after-drying section 12 can be configured analogously or at least similarly to the drying section 12 used in method step f).
  • After-dryer section 12 can therefore be dispensed with at this point, and reference is made to FIG. 3 and the associated description. It is only important that in process step h) the coated paper web 8 is post-dried to a water content of 3% by weight to 7% by weight. In particular, it can be provided that in method step h) a water content of the coated paper web 8 of 4% by weight to 6% by weight is set.
  • the coated and post-dried paper web 8 is made up in one process step.
  • One possibility or an exemplary embodiment for assembling the paper web 8 is illustrated in FIG. 6.
  • the coated and dried paper web 8 can here, for example, first be smoothed by means of a calender 26, and then applied, for example, to a take-up roll 27 for transporting the paper web 8 or for further, external packaging.
  • this packaging it is of course also conceivable to divide the paper web (not shown) both in the longitudinal direction to form paper strips and to divide it in the transverse direction to form sheets.
  • the method steps d) to i) illustrated in FIGS. 1-6 can be carried out in a paper machine in direct succession. What is important here is the successive dehydration of the pulp suspension 1 and the drying of the paper web 8 in the process sequence, including the joint drying of the paper web 8 with the coating or the subsequent drying of the coated paper web in process step h). This applies to the specified ranges for water contents for the aqueous pulp - 16 -
  • Suspension 1 or the paper web 8 In the case of water contents in the individual process steps in question, which are outside the respective upper and lower limit values, the resulting products or transfer papers can increasingly have poor properties, with varying water contents, which are within the respective The limit values specified for the process steps in question have only slight or hardly any negative effects on the properties desired for a transfer paper for dye-sublimation printing processes.
  • a transfer paper 28 for dye sublimation printing processes is shown in cross section.
  • Such a transfer paper 28 can in particular be produced according to a method as described above with reference to the exemplary embodiments in FIGS. 1 to 6.
  • the transfer paper 28 is shown in FIG. 7 in detail and not true to scale, and can in principle have any dimensions suitable for a thermal transfer printing process provided.
  • a standardized dimensioning for paper can be provided, such as Din A4 or Din A3.
  • the multilayer transfer paper 28 comprises, on the one hand, a paper substrate 29.
  • the paper substrate 29 here has a weight per unit area of 40 g / m 2 to 160 g / m 2 .
  • At least one surface 30 of the paper substrate 29 is provided with a coating 31.
  • This coating 31 consists at least predominantly of a modified starch.
  • the coating can consist of more than 90% by weight of the modified starch, but can, for example, contain small amounts of impurities caused by manufacturing or otherwise, as well as additives customary in paper technology.
  • the coating 31 contains a water content set in the course of the production of the transfer paper 28, the transfer paper 28 and thus also the coating 31 having a water content of 3% by weight to 7% by weight.
  • the transfer paper 28 and thus also the coating 31 can preferably have a water content of 4% by weight to 6% by weight.
  • the modified starch is cationically modified and has a degree of substitution by cationic groups of 0.03 to 0.6 mol / mol.
  • the coating 31 consists at least predominantly of a starch modified cationically with quaternary ammonium groups. - 17 -
  • the coating 31 can preferably have a weight per unit area of 0.2 g / m 2 to 4 g / m 2 . Furthermore, it can preferably be provided that the transfer paper 28 has a water absorbency according to Cobb according to ISO 535 of 20 g / m 2 to 35 g / m 2 .
  • only one surface 30 of the paper substrate 29 can be provided with a coating 31 comprising the modified thickness. In principle, however, both can also
  • Surfaces 30, 32 of the paper substrate 29 can be provided with a coating 31 comprising the modified thickness.
  • a surface 30 of the paper substrate 29 can be provided with the coating 31 comprising the cationically modified starch, and the surface 32 of the paper substrate 29 opposite this surface 30 with a further, different coating 33 be provided.
  • the further coating 33 consists at least predominantly of an enzymatically degraded starch.
  • Fig. 8 finally, method for printing textiles is roughly schematically Darge provides.
  • the method here is formed by a dye-sublimation printing process.
  • a negative print image is first produced on transfer paper 28 by means of one or more sublimation printing dye (s) 34.
  • This can in principle be carried out by means of conventional printing methods, with contact printing methods such as rotary screen printing or contactless printing methods such as inkjet printing being able to be used.
  • the printing method can provide for the negative print image to be monochrome or multicolored, with multicolor print images of course being able to use several sublimation dyes or pigments of different colors as is known per se.
  • the transfer paper 28 shown in FIG. 8 is a paper coated at least on one side, as was described above with reference to FIG.
  • the side 35 of the transfer paper 28, which is provided with the coating 31 consisting at least predominantly of the cationically modified starch, is provided for printing with the thermal sublimation dye (s) 34.
  • the side 35 of the transfer paper 28 which has been printed in this way and which is provided with the coating 31 as shown in FIG. 7 is then brought into contact with a textile substrate 36 to be printed.
  • the thermal sublimation dye (s) or the print image formed by the thermal sublimation dye (s) are or are at least partially applied to the transfer paper 28 by means of a thermal transfer printer 37, shown only partially and in a highly schematic manner in FIG the textile sub-start 36 transmitted.
  • a thermal transfer printer 37 as is known per se, the sublimation dye (s) or the sublimation pigment (s) are / are converted into the gas phase by heating and, if necessary, transferred into the textile substrate with the help of pressure .
  • the transfer paper 28 can then be removed from the textile substrate 36, wherein, as indicated in FIG. 8, a residual amount of sublimation dye (s) can remain in the transfer paper 28.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • transfer papers were produced as test papers A, B, C, each with different surface weights of the coating, at least predominantly from cationically modified starch.
  • the production here took place according to process steps a) -h) of the process described above.
  • the water content of the aqueous suspension of the pulp and of the paper web formed in the course of the process fluctuated slightly in the course of the production of the individual transfer papers, but were within the ranges specified for the relevant process steps. No significant effects of slightly different water contents on the properties of the transfer papers produced were found - 19 - will be.
  • the aqueous solution of the cationically modified starch was applied to one surface of the paper web by means of a film press, and an aqueous solution containing 10% by weight of an enzymatically degraded starch was applied to the other surface
  • the coating of cationically modified starch had the following weights per unit area in the transfer and test papers produced:
  • the identical print images applied in each case to the transfer papers A, B, C and to the comparison papers D, E were each transferred to a commercially available polyester textile by means of a thermal transfer press, type Hotronix STX11.
  • the transferred print images were then characterized individually for each printing color by means of densitometry with regard to color density.
  • test series 1 and 2 were carried out, with two different, commercially available sublimation inks each having four base colors or dyes for inkjet printing being used for printing the test papers in test series 1 and 2.
  • the printing of the test papers before transfer to the polyester textile was therefore carried out by means of inkjet printing.
  • Table 1 shows the mean values D mi and D m 2 of the color densities for both test rows 1 and 2 for the printed images transferred to the polyester textiles by means of test papers A, B, C, D, E.
  • the highest possible values for the color density are desirable in Table 1.
  • thermal sublimation printing processes were also carried out to further characterize the suitability of a transfer paper coated according to the invention with the cationically modified starch, in which a conventional printing paper with a surface was placed on the back of each transfer paper or test paper. A weight of 50 g / m 2 was placed as the back test paper.
  • the respective dye-sublimation printing processes were otherwise carried out in a completely analogous manner to that described under embodiment 1. - 21
  • the reverse side test papers were tested with regard to a breakthrough of dyes of the inks used in test series 1 and 2 on the reverse side of a respective test paper, i.e. an undesired penetration of the dyes onto the reverse side of the respective test paper and Transfer of the dyes to the test paper on the back is examined visually by a trained test person, and assessed according to the school grade principle, i.e. from 1 to 5.
  • backside test papers that do not include any discernible traces of color are rated 1
  • backside test papers, which have a print image that is almost completely passed through or transferred to the backside test paper are rated 5.
  • a reference folder with samples of different quality serves as a basis for the assessment or for the grading of grades for comparison or as a reference point.
  • the printed images on the back test papers for the ink of test series 1 were evaluated electronically.
  • the back test papers were scanned with a high-resolution scanner and evaluated using the Evaluation Software Print Target from the company strigbau. An evaluation was carried out once with the software setting Low sensitivity and once with the software setting High sensitivity.
  • the paper produced as described with the coating at least predominantly consisting of the cationically modified starch is well suited as transfer paper for thermal sublimation printing processes. Above all, unwanted penetration or passage of
  • Th erm o suhl i m ati on sf r materials can be effectively held back on the back of such transfer paper.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Paper (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

L'invention concerne un procédé de production de papier transfert pour des procédés d'impression par sublimation de colorants, un papier transfert pour des procédés d'impression par sublimation de colorants, et un procédé d'impression sur des textiles. Le procédé de production de papier transfert comprend une étape consistant à enduire au moins une surface d'une bande de papier par application d'une solution aqueuse d'un amidon modifié cationiquement, qui a un degré de substitution par des groupes cationiques de 0,03 à 0,6 mol/mol, et une étape pour le post-séchage de la bande de papier couché. Le papier transfert comporte un substrat de papier, au moins une surface dudit substrat de papier étant pourvue d'un revêtement qui est constitué au moins principalement d'un amidon modifié cationiquement ayant un degré de substitution par des groupes cationiques de 0,03 à 0,6 mol/mol.
PCT/AT2020/060305 2019-08-16 2020-08-13 Papier transfert pour procédés d'impression par sublimation de colorants, et procédé de production de papier transfert WO2021030851A1 (fr)

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ATA50720/2019A AT522768B1 (de) 2019-08-16 2019-08-16 Transferpapier für Thermosublimationsdruck-Prozesse und Verfahren zur Herstellung von Transferpapier
ATA50720/2019 2019-08-16

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EP1500746A2 (fr) * 2003-07-23 2005-01-26 Fuji Photo Film Co., Ltd. Papier et matériau d'enregistrement d'image
US20050186363A1 (en) 1998-07-29 2005-08-25 W.A. Sanders Papierfabriek Coldenhove B.V. Transfer paper for printing with an inkjet printer
KR20110106507A (ko) * 2010-03-23 2011-09-29 코스코엠주식회사 승화전사지용 배리어층 조성물 및 이를 코팅한 승화전사지
US20120050392A1 (en) * 2009-05-11 2012-03-01 Sami Puttonen Use of composition for improving inkjet printing properties and an inkjet recording sheet
CN107142782A (zh) * 2016-12-30 2017-09-08 山东华泰纸业股份有限公司 一种热升华数码转移印纸的生产方法
WO2018139925A1 (fr) 2017-01-27 2018-08-02 Crown Van Gelder B.V. Composition de papier pour impression par transfert
US20190001728A1 (en) 2015-06-12 2019-01-03 Coldenhove Know How B.V. Improved transfer paper for inkjet printing

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DE102014116550A1 (de) * 2014-11-12 2016-05-12 Papierfabrik August Koehler Se Thermosublimationspapier
WO2017217274A1 (fr) * 2016-06-14 2017-12-21 三菱製紙株式会社 Papier à report
JP6310121B1 (ja) * 2017-06-08 2018-04-11 大王製紙株式会社 昇華型インクジェット捺染転写紙

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US20050186363A1 (en) 1998-07-29 2005-08-25 W.A. Sanders Papierfabriek Coldenhove B.V. Transfer paper for printing with an inkjet printer
EP1500746A2 (fr) * 2003-07-23 2005-01-26 Fuji Photo Film Co., Ltd. Papier et matériau d'enregistrement d'image
US20120050392A1 (en) * 2009-05-11 2012-03-01 Sami Puttonen Use of composition for improving inkjet printing properties and an inkjet recording sheet
KR20110106507A (ko) * 2010-03-23 2011-09-29 코스코엠주식회사 승화전사지용 배리어층 조성물 및 이를 코팅한 승화전사지
US20190001728A1 (en) 2015-06-12 2019-01-03 Coldenhove Know How B.V. Improved transfer paper for inkjet printing
CN107142782A (zh) * 2016-12-30 2017-09-08 山东华泰纸业股份有限公司 一种热升华数码转移印纸的生产方法
WO2018139925A1 (fr) 2017-01-27 2018-08-02 Crown Van Gelder B.V. Composition de papier pour impression par transfert

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BE-MILLER, J. N.WHISTLER, R. L.: "Starch: Chemistry and Technology", 2009, ACADEMIC PRESS

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AT522768A4 (de) 2021-01-15
EP4013913A1 (fr) 2022-06-22
EP4013913C0 (fr) 2023-12-27
AT522768B1 (de) 2021-01-15
EP4013913B1 (fr) 2023-12-27

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