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
• • 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
• • 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
  • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
  • B41M2205/36—Backcoats; Back layers
• • 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
  • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer

Definitions

• the invention relates to a sheet-like transfer material for the dye sublimation transfer process of an inkjet print image with a support and a color receiving layer on the front side. Consequently, it relates in particular to a transfer paper which is provided for printing with sublimable dyes by the inkjet printing process and from which, after printing, the dyes are transferred under heat to a receiving material by sublimation.
• the invention also relates to the transfer method using the transfer material.
• transfer printing For printing on materials such as textiles or rigid bodies, which are difficult to print for mechanical reasons by direct printing process, offer transfer printing, in which first a flexible sheet-shaped transfer material is printed and the printed image is transferred from this to the object to be printed.
• a particular embodiment of such a transfer printing process is the dye sublimation process, which is described, for example, in US Pat Thompson: Printing Materials - Science and Technology (1998) on page 468 is described.
• the image to be printed on the transfer material is applied using printing inks, which are evaporated after the drying of the print under the action of heat and imagewise on the gas phase on the final material to be printed again.
• the sublimation inks can be advantageously applied to the transfer material by digital printing, in particular the inkjet printing process, which allows individual and personalized prints, for example on textiles.
• the transfer material on which the first printing step takes place by means of inkjet printing technology is preferably a paper transfer material.
• a paper transfer material In the EP 1 101 682 A1 is a coated paper described, which has a low air permeability on the side to be printed. This is to avoid that in the sublimation transfer step, a part of the sublimable dyes penetrates into the porous paper interior and thus lost for transfer to the final material to be printed.
• such papers with a low porosity on the page to be printed take up the inkjet ink liquid only very slowly and lead to a slow drying and bleeding of the ink on the surface and thus to an unsatisfactory printing sharpness, especially at high printing speeds.
• the invention has for its object to provide a transfer paper for the inkjet printing sublimable dyes available that has a fast drying and high pressure sharpness when using aqueous printing inks and at the same time a substantially complete transfer of the sublimable dyes on the final to be printed Material guaranteed and has no or only a slight breakdown of the sublimable dyes on the backside of the transfer paper.
• a transfer material for the dye sublimation transfer process of an inkjet print image with a support and a dye receiving layer on the front side of the transfer material wherein the ink receiving layer is porous and the transfer material contains a barrier layer, either on the back of the transfer material or between support and porous ink receiving layer is disposed.
• the barrier layer may be arranged either between the porous ink-receiving layer and the paper carrier or on the surface of the paper carrier opposite the ink-receiving layer.
• the invention further relates to a method for transferring an image to a surface by printing an inventive transfer material with an image by the ink-jet printing process and transfers the image by sublimation on the surface.
• the transfer papers according to the invention comprise a paper support having a porous ink-receiving layer applied on the pressure side and a barrier layer which is arranged between the ink-receiving layer and the paper support and / or preferably on the surface of the paper support opposite the ink-receiving layer.
• the backing paper is preferably an uncoated or surface sized paper.
• the backing paper may contain, in addition to pulp fibers, sizing agents such as alkylene dimers, fatty acids and / or fatty acid salts, epoxidized fatty acid amides, alkenyl or alkyl succinic anhydride, starch, tree resins, wet strength agents such as Polyamine-polyamide-epichlorohydrin, dry strength agents such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers and other known in the paper industry chemical additives may contain.
• the base paper can be surface-sized. Examples of suitable sizing agents are polyvinyl alcohol or oxidized starch.
• the base paper can be produced on a Fourdrinier or a Yankee paper machine (cylinder paper machine).
• the basis weight of the base paper may be 30 to 200 g / m 2 , in particular 40 to 120 g / m 2 .
• the raw paper can be used in uncompacted or compacted form (smoothed).
• Particularly suitable are base papers with a density of 0.6 to 1.05 g / cm 3 , in particular 0.70 to 0.9 g / cm 3 .
• the smoothing can be done in the usual way with a calendering.
• the pulp for papermaking is preferably a eucalyptus pulp with a pulp content of less than 200 microns after grinding of 10 to 35 wt .-% and an average fiber length of 0.5 to 0.75 mm. It has been found that the use of a pulp with a limited proportion of fibers smaller than 200 microns reduces the loss of stiffness occurring when using filler.
• Hardwood pulps (NBHK - Northern Bleached Hardwood Kraft Pulp) and softwood pulps may also be used.
• pulp fibers it is also possible to use fractions of other natural or synthetic fibers for the production of the backing paper.
• the proportion of the other fibers in the total fiber mass is below 40 wt .-%, particularly preferred proportions of other fibers below 20 wt .-%.
• kaolins calcium carbonate in its natural form such as limestone, marble or dolomite, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silica, alumina and mixtures thereof can be used in the base paper.
• Particularly suitable is calcium carbonate with a particle size distribution, wherein at least 60 % of the particles are smaller than 2 ⁇ m and at most 40% are smaller than 1 ⁇ m.
• calcite is used with a numerical particle size distribution, in which about 25% of the particles have a particle size of less than 1 micron and about 85% of the particles have a particle size of less than 2 microns.
• a calcium carbonate having a numerical particle size distribution can be used in which at least 70%, preferably at least 80%, of the particles are smaller than 2 ⁇ m and at most 70% of the particles are smaller than 1 ⁇ m.
• One or more further layers may be arranged between the carrier paper and the ink receptive layer and / or barrier layer.
• this involves a hydrophilic binder-containing layers.
• the dye-receiving layer disposed on the side of the support paper to be printed may contain an inorganic pigment and binder. Particularly preferred are pigments having an anionic, neutral or only weakly cationic surface such as silica, calcium carbonate, kaolin, talc, bentonite or aluminum oxides or Aluminiumoxdidhydrate. However, it may also contain finely divided polymeric compounds, with high-melting thermoplastic or thermosetting polymers are preferred. In a further embodiment of the invention, the ink receptive layer may also contain a mixture of two or more pigments. The pigments preferably have an average particle size of 100 nm to 30 .mu.m, particularly preferably from 200 nm to 10 .mu.m.
• the dye-receiving layer preferably additionally contains a polymeric binder, preferably a hydrophilic polymeric binder.
• the binder may be a water-soluble or water-dispersed binder.
• Preferred binders are styrene copolymers, polyvinyl alcohol, starch, modified starch, polyvinyl acetate, acrylates or polyurethane dispersoids.
• the mass ratio of pigment to binder is 100: 1 to 100: 50, preferably 100: 40 to 100: 2.
• the dye-receiving layer is preferably prepared by applying an aqueous coating slip applied to the paper support, whereby all customary in the paper industry application method can be used. Particularly preferred is an application by means of blade, doctor blade, film press or curtain cover.
• the coating composition may contain other conventional additives such as wetting agents, thickeners, rheology aids, dyes and optical brighteners.
• the application weight of the dye-receiving layer is preferably 1 g / m 2 to 50 g / m 2 , more preferably 3 g / m 2 to 30 g / m 2 .
• the air permeability of the dye-receiving layer, measured according to Bendtsen, is greater than 100 ml / min, preferably 200 ml / min to 700 ml / min.
• a barrier layer is arranged between the ink receiving layer and the paper carrier and / or on the back of the paper carrier.
• the barrier layer is characterized by a low permeability to air and gases as well as water vapor.
• the air permeability of the barrier layer measured according to Bendtsen, is less than 100 ml / min, preferably less than 10 ml / min.
• the barrier layer preferably contains one or more polymeric compounds.
• the barrier layer contains one or more thermoplastic polymers, wherein high-melting thermoplastic polymers such as polyester or polymethylpentene are particularly preferred.
• the barrier layer may be applied by the melt extrusion coating method.
• the barrier layer is formed by applying an aqueous solution or an aqueous dispersion of one or more water-soluble or water-dispersed polymers.
• Preferred polymers are styrene copolymers, polyvinyl alcohols or polyvinyl acetate.
• the barrier layer contains polymers based on renewable raw materials, such as starch, modified starch and / or cellulose derivatives, for example carboxymethylcellulose (CMC).
• the coating weight of the barrier layer is preferably 1 g / m 2 to 40 g / m 2 , more preferably 2 g / m 2 to 20 g / m 2 .
• the transfer material according to the invention is particularly suitable for transferring a printed image onto a surface selected from polyester fabric, polyester nonwoven fabric, a surface coated with a polyester layer or a polyester surface.
• the carrier paper To prepare the carrier paper, a eucalyptus pulp was used. For milling, the pulp was milled as an approximately 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 26 ° SR. The concentration of pulp fibers in the thin was 1 wt .-%, based on the mass of the pulp suspension.
• the thin stock, other additives were added as a neutral sizing agent alkylketene dimer (AKD) in an amount of 0.23 wt .-%, wet strength agents polyamine-polyamide-epichloro-hydrinharz (Kymene ®) in an amount of 0.60 wt .-%, Starch (C-Bond HR 35845) in an amount of 1.0% by weight and a natural ground CaCO 3 in an amount of 15% by weight.
• the quantities are based on the pulp mass.
• the thinstock whose pH was adjusted to about 7.5, was transferred from the head box to the wire of the paper machine, followed by sheet formation by dewatering the web in the wire section of the paper machine.
• the further dewatering of the paper web to a water content of 60 wt .-%, based on the track weight. Further drying took place in the dryer section of the paper machine with heated drying cylinders.
• the result was a base paper with a basis weight of 90 g / m 2 , a filler content of 10 wt .-% and a humidity of about 5.5%.
• the base paper is surface-sized on both sides in a size press containing 3% by weight C-Film 05731 starch from Cargill and water.
• the amount of starch applied on both sides is about 1.5 g / m 2 .
• the carrier paper is again dried and smoothed.
• the carrier paper thus obtained has an air permeability, measured by the Bendtsen method according to DIN 53120-1, of 700 ml / min.
• the reference material used is a commercially available transfer material with a release and barrier layer (Transjet Classic 831-100 g / m 2 ). This comparative material has no porous coating on the pressure side.
• Example 2 It is applied to the carrier paper prepared according to Example 1, the coating composition of Example 2 with a knife and dried. The dry application is 15 g / m 2 .
• the coating composition for the barrier layer of Example 3 is applied with a doctor blade and dried.
• the dry application was 5 g / m 2 .
• the coating composition from Example 2 is applied to the barrier layer thus obtained using a doctor blade and dried.
• the dry application of this layer is 20 g / m 2 .
• Example 2 It is applied to the carrier paper produced under Example 1, the coating composition of Example 2 with a doctor and dried. The dry application is 15 g / m 2 .
• the coating slip for the barrier layer from Example 3 was applied with a doctor blade and dried. The dry application was 5 g / m 2 .
• the resulting transfer materials were printed with a color image using the inkjet printer EPSON WP4015 with sublimation color inks SubliJet IQ Sawgrass used.
• the print definition is evaluated visually and with a microscope both on the transfer material before image transfer and after sublimation transfer to the fabric.
• the color density is measured for the full color fields CMYK with a spectrophotometer SpectroEye from X-rite.
• test results of the table show that the transfer materials according to the invention have a very good drying behavior after inkjet printing, show a high line sharpness even in the image transferred to the tissue, transfer the sublimation dye to the tissue to a high degree in the sublimation transfer process and only very little Dye through the back.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Decoration By Transfer Pictures (AREA)
• Laminated Bodies (AREA)
• Coloring (AREA)
• Paper (AREA)

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Publications (1)

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Family Applications After (1)

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Citations (6)

Family Cites Families (5)

• 2015
  • 2015-05-28 EP EP15169650.7A patent/EP3098085A1/fr not_active Withdrawn
• 2016
  • 2016-05-24 WO PCT/EP2016/061630 patent/WO2016188976A2/fr not_active Ceased
  • 2016-05-24 HK HK18106326.2A patent/HK1246740A1/zh unknown
  • 2016-05-24 CN CN201680031079.1A patent/CN107690389A/zh active Pending
  • 2016-05-24 BR BR112017025584A patent/BR112017025584A2/pt not_active Application Discontinuation
  • 2016-05-24 EP EP16726062.9A patent/EP3302991A2/fr not_active Withdrawn
  • 2016-05-24 JP JP2017561712A patent/JP2018522758A/ja active Pending
  • 2016-05-24 US US15/576,410 patent/US20180154666A1/en not_active Abandoned
  • 2016-05-24 KR KR1020177037616A patent/KR20180008801A/ko not_active Ceased
• 2017
  • 2017-11-28 CO CONC2017/0012217A patent/CO2017012217A2/es unknown

Patent Citations (6)

Non-Patent Citations (1)

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