Classifications

• • 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
  • D06P5/007—Transfer printing using non-subliming dyes
• • 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
  • D06P5/30—Ink jet printing

Definitions

• the present invention relates to a process for printing a textile based on fibers of plant, animal or artificial origin from a transfer medium.
• the field of use of the present invention relates to the production of textiles printed by inkjet printing.
• ink jet printing of specific patterns on a textile can be achieved by direct printing on the textile or by transfer.
• Transfer printing consists in transferring, on a textile based on synthetic fibers, a pattern previously printed on a paper type support, for example under the effect of heat, which does not require, in most cases, a post-print processing.
• the transfer paper may be previously printed by inkjet with a sublimable dye.
• Direct printing by means of a reactive dye or acid dye is carried out on a textile based on fibers of vegetable, animal or artificial fibers previously padded with chemical compounds necessary for fixing dye whose presence requires post-printing treatment.
• the dye tends to remain on the surface of the textile, causing the partial hydrolysis of the dye.
• the degree of fixation of the dye on the fiber is between 60 and 70%, which causes, during washing, a concentration of 30 to 40% of hydrolysed dye in the effluent source of pollution.
• the textile support coating beforehand leads to a significant consumption of chemical compounds compared to conventional printing: in particular urea, which is necessary to capture the moisture present in the fixing area (vaporization ) during the fixation phase. Hydration of the printed tissue resulting from the action of urea allows the fixation reaction to begin. This reaction is exothermic and the second role of urea is to stabilize the temperature in order to avoid stopping the temperature-sensitive fixing reaction. This mechanism being specific to the reactive dye. However, the excessive use of urea contributes to a greater toxicity in the discharges.
• sublimable dye transfer printing is not compatible on substrates other than synthetic-based fibers.
• the present invention overcomes and solves these problems by a wet transfer printing method.
• the present invention relates to a process for printing a textile of any kind, using a coated and printed transfer medium.
• the present invention relates to a process for inkjet printing of a textile based on fibers of vegetable, animal or artificial fibers according to the following steps:
• the textile used in this process is based on fibers of plant, animal or artificial fibers. Even though the textile may comprise synthetic fibers, it is advantageously a non-synthetic textile.
• Fibers of plant origin may be chosen in particular in cellulose-based fibers, such as cotton, linen, hemp, bamboo, rummy and mixtures thereof.
• the fibers of animal origin can in particular be chosen from the group comprising, silk, wool, and their mixtures
• the fibers of artificial origin may in particular be chosen from the group comprising viscose, cupro, and mixtures thereof.
• Fibers can come from textile recycling channels. It may also be a textile previously tinted in the mass. This textile may be a fabric, a knit or a nonwoven. It is preferably a fabric or a knit commonly called mesh.
• the textile may be in the form of a strip of several tens of meters rolled and whose width may be between 0.80 and 3.2 meters, preferably between 1.30 and 1.65 meters. It can be stored as a roll or reel.
• the textile is advantageously coated and calendered at a speed of between 1 and 50 meters / minute, more preferably between 20 and 30 m / min. The respective speeds of coating and calendering are not necessarily identical.
• the textile Prior to printing by wet transfer, the textile is impregnated, in particular by coating or padding, with an active solution.
• the coating is carried out on at least one face of the textile, and more particularly the face to be printed.
• the padding induces an impregnation of the textile on both sides.
• the impregnation of the textile is advantageously carried out with an active solution comprising, by weight relative to the weight of the active solution:
• an anti-reductant preferably 0.1 to 1%.
• the alkaline compound may especially be chosen from soda, sodium carbonate, sodium bicarbonate or any other component making it possible to render an alkaline solution.
• the anti-reducing agent may especially be chosen from the group of oxidants, such as the anti-reducing agent marketed under the name DIAUX GR or LI by the company CALDIC for textile finishing.
• this anti-reducing agent is sodium nitrobenzene sulphonate. They protect the dyes from the reduction related to textile (viscose), water, thickener or steam.
• the coating or padding of the textile is advantageously carried out at a temperature between 15 and 60 ° C, more preferably at room temperature.
• the active solution has a viscosity advantageously between 1 and 1000 cps, advantageously between 1 and 50 cps, measured at room temperature.
• the active solution fixes the dye of the print pattern previously printed on the transfer medium.
• its purpose is to allow the fixing of the dye on the fibers of the textile.
• the active solution may also comprise urea, advantageously less than 10% by weight relative to the weight of the active solution. This amount is significantly lower than that used in conventional processes.
• the active solution is advantageously free of urea.
• the invention also makes it possible to reduce or eliminate the quantity of nitrogenous discharges, which provides an undeniable environmental advantage.
• the moisture content of the impregnated textile is advantageously controlled prior to the calendering step.
• the impregnated textile has a moisture content advantageously between 5 and 70%, more preferably between 12 and 45% depending on the type of fibers.
• the control of the moisture content is ensured by applying pressure on the impregnated textile, in the case where the impregnation results from padding. However, it is better controlled by suction using a source of depression or vacuum.
• This regulation of the humidity level can occur before or after calendering. When it occurs after calendering, there is an improvement in the transfer of the printing pattern, especially over the entire thickness of the textile.
• the method according to the invention implements the wet transfer of a paper, previously coated and printed, on an impregnated textile.
• the transfer paper can be coated according to all conventional coating techniques, in particular by engraved roll or squeegee.
• the coating of the transfer paper can be carried out online or offline.
• the transfer paper is a carrier based on cellulosic fibers. It has a basis weight of between 18 and 70 g / m 2 , and advantageously between 45 and 55 g / m 2 .
• the coating of the transfer paper is advantageously carried out by means of a thickening composition advantageously comprising, by weight relative to the weight of the thickening composition:
• a natural or artificial thickener advantageously 80 to 99%, 0 to 5% of a wetting agent, advantageously 1 to 2%.
• the thickening composition is water-based.
• the thickener may especially be chosen from unmodified (alginates) or chemically modified natural polysaccharides and entirely synthetic polymers, such as those marketed under the name SETAGIN by the company SET AS.
• unmodified natural polysaccharides anionic sodium alginate is advantageously chosen.
• the wetting agent may especially be chosen from the group comprising polyglycol ethers, or hydrocarbon surfactants, as sold under the name SETACOMPACT VSAK by SETAS.
• This coating solution may also comprise any type of additive that makes it possible to improve the solubility of the dye and to improve the fixing of the dye.
• additives may in particular be salt, such as refined fine salt food grade (NaCl) or sequestering (for example an acrylate-phosphonate) such as marketed under the brand SETACRYSTAL by the company SETAS.
• the resulting layer of this coating serves to support the printing pattern as an anti migrant. It freezes the drop of dye and prevents the firing of the print. In other words, it prevents the drops of printing ink from spreading. It does not stick, which also makes it possible to store the coated transfer paper, and possibly printed, in the form of a roll.
• the transfer paper is printed to define a printing pattern.
• This is the mirror image of the final pattern that is printed on the textile.
• the printing of the backing paper is performed on the previously coated side.
• Any digital printing technique can be implemented, including inkjet printing. It can be a scanning type impression or "single pass”.
• This printing makes it possible to define a pattern to be printed on the textile.
• the printing of this pattern is performed using an aqueous ink containing at least one dye. It can be reactive dye (s), acid dye (s) or all types of soluble dyes.
• the ink does not comprise compounds facilitating the fixation of the dye on the textile. It is advantageously an aqueous ink.
• the ink contains dye, a dispersing agent and water.
• the following dyes may be used: reactive dyes of the monochlorotriazine and vinylsulfone type.
• the type of dye in particular according to the nature of the fibers of the textile to be printed.
• the dye (s) chemically binds to the textile fibers forming covalent bonds.
• the coating layer of the transfer paper makes it possible to avoid a reaction between the dye (s) and the cellulosic fibers of the paper. Said layer is barrier in order to avoid an unwanted fixation reaction with the paper.
• the printing ink has a viscosity of preferably between 1 and 20 cps, more preferably between 6 and 8 cps, measured at room temperature.
• This ink can thus be printed in particular by ink jet.
• it does not contain thickener or chemical compounds facilitating the fixing of the dye.
• the presence of any chemical compound for fixing the dye is generally provided in the coating of the textile.
• the printing speed of the transfer paper is advantageously of the order of 1 to 300 meters / minute, for example on scan-type machines of 1 to 10 m / min, and on single-pass machines of 30 at 150 m / min.
• the calendering that is to say the compression between the transfer paper and the textile, is carried out at a temperature between 20 and 120 ° C, preferably at room temperature.
• the compression between the transfer paper and the textile must avoid any sagging during the transfer of the printing pattern.
• the compression between the transfer paper and the textile is advantageously carried out at a pressure lower than the pressure achieved during the coating of the textile.
• the coating layer of the transfer paper is solubilized and is absorbed by the textile.
• the textile absorbs the solubilized coating containing the previously printed dye.
• the printing pattern is then transferred to the textile.
• the transfer paper and the textile are separated at the output of the calendering rollers.
• the textile then printed that is to say at the calender outlet, is subjected to a source of vacuum or vacuum, making it possible to adjust the moisture content, and favoring the crossing throughout the thickness. of the printing pattern textile.
• the printing pattern is attached to the textile in a spray chamber. This fixing in a moist environment makes it possible to fix the dyes and thus the printing pattern. Since the fixing is very rapid and immediately follows the transfer, the use of urea according to the conventional methods is then optional or even unnecessary.
• This process thus makes it possible to transfer at least 90% of the dye generally onto the textile.
• This step of fixing the printing pattern on the textile is advantageously carried out under saturated steam, typically at a temperature between 100 and 110 ° C, or under superheated steam at a temperature between 150 and 170 ° C. As already indicated, this fixing step is performed in a vaporization chamber.
• the vaporization chamber corresponds to an oven saturated with superheated steam. Fixing is advantageously carried out for a duration of between 20 seconds and 12 minutes, advantageously between 30 and 180 seconds.
• the fabric can be washed online or subsequently offline, using conventional detergents.
• the textile can be rid of any residues of chemicals.
• the washing may in particular be carried out at a temperature of between 20 and 100 ° C., advantageously between 20 and 60 ° C.
• the present invention provides many advantages over conventional printing methods, including:
• contact printing makes it possible to increase the specific surface area between the dye and the textile fibers with respect to direct digital printing on a textile. This makes it possible to have a much higher dye fixation rate, and thus a dye hydrolysis rate significantly decreased.
• the dye fixation rate is higher than that of direct digital printing (at least 90% vs. 60%), which reduces the amount of chemical waste and improves the washing process of the printed textile.
• the printing of the transfer paper then the transfer on the textile makes it possible to improve significantly the quality and the precision of printing compared to a direct impression on the textile.
• the print heads are, in general, closer to a paper support than a textile support, which therefore improves the sharpness of the printing pattern.
• printing on paper is much faster than printing on textiles, usually about 4 to 5 times faster, thus saving time.
• wet transfer printing that is to say by contact, improves the penetration of the dye compared to a direct digital printing on textile
• the print quality is therefore higher, which also makes it possible to reduce the percentage of printed products that do not comply with the quality criteria, for example due to possible flipping of threads during the making process.
• the invention also relates to the vehicle for transferring the printing pattern.
• This consists of a transfer paper coated on one of its faces with a thickening composition based on water, advantageously comprising, by weight relative to the weight of the thickening composition 60 to 99% of a thickener natural or artificial, advantageously 80 to 99%, optionally accompanied by 0 to 5% of a wetting agent, advantageously 0.1 to 1%.
• the thickener may especially be chosen from unmodified (alginates) or chemically modified natural polysaccharides and entirely synthetic polymers, such as those marketed under the name SETAGIN by the company SET AS.
• unmodified natural polysaccharides anionic sodium alginate is advantageously chosen.
• the wetting agent may especially be chosen from the group comprising polyglycol ethers, or hydrocarbon surfactants, as sold under the name SETACOMPACT VSAK by SETAS.
• the density of said transfer vehicle is advantageously between 50 and 60 g / m 2 .
• FIG. 1 represents an installation making it possible to implement the method according to the invention.
• FIG. 2 represents an enlargement of a section of the installation making it possible to implement the method according to the invention.
• FIG. 1 This installation comprises:
• a textile (1) advantageously stored in the form of a roll
• a pressure regulation (3) such as for example by means of a vacuum or vacuum source (11), positioned upstream or downstream of the two rollers (4), and which allows in addition to controlling the humidity level before the fixing step,
• Figure 2 also illustrates this installation, with the exception of the vaporization chamber (7).
• This installation may also include means (9) for managing the tension of the textile before and / or after printing the textile. It may also comprise means (8) for storing, possibly winding, the printed textile. It may also comprise an articulated arm (10), whose pendulum movement makes it possible to deposit the printed textile in the form of S-folds.
• the vaporization chamber comprises a printed fabric drying circuit that can extend over a length of between 10 and 50 meters, preferably between 15 and 20 meters, and even more preferably of the order of 18 meters. It can also be in the form of a pleated spray.
• a system of back and forth by means of rotary axes makes it possible to reach such a length of circuit.
• a vaporization chamber whose height may be less than or equal to 5 meters.
• the active solution comprising water and a basic or alkaline compound
• washing step of the printed textile the latter being performed by means of device and conventional detergents.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2017
  • 2017-06-08 FR FR1755082A patent/FR3067368B1/fr not_active Expired - Fee Related
• 2018
  • 2018-06-07 EP EP18736994.7A patent/EP3635172A1/de not_active Withdrawn
  • 2018-06-07 BR BR112019025665-2A patent/BR112019025665A2/pt not_active Application Discontinuation
  • 2018-06-07 WO PCT/FR2018/051325 patent/WO2018224785A1/fr unknown
  • 2018-06-07 CN CN201880038115.6A patent/CN110719977A/zh active Pending

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