DE10242216A1 - A flat textile printing process involving ink jet printing of a pattern useful for digital ink jet printing of textiles onto a dark background using reserve and etching inks - Google Patents

Abstract

A textile printing process in which a flat textile structure with a base color, preferably dark, is provided with a printing pattern in a pattern region, where a reserve ink is printed onto the pattern region under pressure by means of an ink jet printer, where the reserve ink in the pattern region hinders permanent fixing of the base color is new. Independent claims are included for: (1) a reserve ink for application to the textile by an ink jet printer, containing a reservation agent (sic), preferably based on sulfite or sulfite adduct for hindering fixation of the base color; (2) an etching ink for application to a flat textile structure by means of an ink jet printer containing a reducing agent, especially sulfoxylate for breaking down the base color.

Description

The invention relates to a textile printing process in which a textile fabric preferably colored dark with a basic dye and is provided with a printed pattern in a pattern area. The The invention further relates to a reserve or etching ink for application a textile fabric.

In classic textile printing with screen printing stencils Is it possible, Print patterns or motifs on dark background surfaces. In principle between white print, Reserve printing and etching printing technology distinguished. With white printing the reason becomes whiter Color covered while at Reserve print completely or partially prevents the base color from being fixed and with the etching pressure the coloring is locally destroyed. The high manufacturing outlay for the templates is particularly disadvantageous for short crops and higher colored ones Motifs.

In addition to the classic methods direct printing technology also for printing on textile surfaces known in the inkjet process for any image motifs reproduce digital processing in high resolution. there is fundamental printing with a dark or colored background is also possible by changing the color of the cover and the motif are printed side by side. Are problematic here with regard to the covering color, high consumption, lack of levelness, limited color space as well as limited color depth and lack of copy. Come in addition the so-called dithering in critical colors, which creates undesirable visible color dots arise.

The invention is based on this based on the task, the disadvantages encountered in the prior art to avoid and the textile printing of motifs on dark or colored Reason largely without design restrictions if possible to enable low production costs.

To solve this task, the in the independent claims each specified combination of features proposed. Advantageous configurations and further developments of the invention result from the dependent claims.

The invention is based on the idea off, inkjet printing for controlled non-coloring or Keep the motif clear of the base color. Accordingly is proposed according to the invention that the pattern area by inkjet printing with a spare ink is applied, with the reserve ink in the sample area permanent fixation of the base dye prevented. alternative it is envisaged that the pattern area by ink jet printing with an etching ink is applied, the etching ink destroyed the basic dye in the pattern area.

This makes it possible to have a level basic coloring too for difficult color shades by a simple dyeing process in a separate process step, while printing the reserve or etching ink flexible design in the subject area by using digital Techniques allowed.

It is for the anti-fix effect beneficial if the reserve ink is a reservation agent based of sulfites, sulfite adducts, thiourea or preparations thereof contains.

However, it is to destroy the Basic dye cheap, if the caustic ink contains a suitable reducing agent, in particular sulfoxylates.

Another improvement can be by making the base dye through a vinyl sulfone dye is formed.

The full-surface coloring of the fabric with the basic dye can be done by a block process before or after applying the reserve or etching ink brilliant colorations with high color strength can be obtained.

In a further process step becomes the textile fabric preferably by exposure to saturated steam of a fixing treatment subjected. A pH regulator can preferably be selected from the group Soda, hydrogen carbonate, sodium hydroxide solution, water glass or potassium carbonate to be activated.

An embodiment of the invention provides that the print pattern as a white reserve or white etchings formed becomes. By applying colored dyes, preferably based of monochlorotriazines it is alternatively possible that the print pattern as a color reserve or color sets is formed.

In a preferred embodiment of the Invention will be a preferably multicolored printing ink for the printing pattern and the spare or etching ink over various ink channels of a digitally controlled inkjet printer sprayed the pattern area. The print head works line by line, wherein a plurality of parallel channels or pressure nozzles are available are through differently colored printing dots printed side by side additively a raster point as the pixel of a digital image or To generate a motif.

It is advantageous here if the reserve or etching ink according to the spot color principle a separate ink channel of the inkjet printhead is applied becomes.

In order not to thermally stress the ink, it is advantageous if a piezo-based inkjet printer is used.

In view of the special circumstances in inkjet printing, it is proposed according to the invention that the reserve or etching ink contains a viscosity regulator based on glycols, in particular polyethylene glycol or polyacrylates, a viscosity in the range from 2 to 10 mPas being favorable for the formation of drops at the nozzle. To adjust the surface tension advantageously in the range from 20 to 50 mN / m, the Re Serving or etching ink contain a preferably nonionic surfactant. In order to prevent drying out, it is advantageous if the reserve or etching ink contains hygroscopic additives, for example urea or glycerin. Biodegradation, for example by bacteria, can be delayed by the fact that the reserve or caustic ink contains a preservative such as formaldehyde.

The reserve advantageously contains or caustic ink demineralized water as a carrier.

Not the inkjet printhead to harm should be the conductivity the reserve or etching ink be less than 60 mS / cm.

To optimize printing operations it is advantageous if the reserve or etching ink is used before use Ultrasound is degassed.

Another aspect of the invention is in a reserve ink for application to a textile fabric by inkjet printing, containing a preferably based on Reservite formed for sulfites or sulfite adducts Fixation inhibition of a basic dye. Yet another object of the invention is an etching ink for application to a textile fabric by inkjet printing, containing a reducing agent, in particular sulfoxylates to destroy a Basic dye.

A preferred use of a reserve according to the invention or caustic ink lies in digital textile printing on a dark background using inkjet technology.

In the following embodiments the invention with regard to digital textile printing on dark Reason closer explained.

The printing process provides that a textile fabric from a natural or synthetic fiber material with a print pattern is created by a defined pattern area using an inkjet printer with a reserve ink or caustic ink is applied, so that a permanent Fixation of a dark basic dye applied by the block process is prevented or the basic dye is destroyed. If there is no further overpressure, so receives a white reserve at these points or white etchings, while by overprinting with colored dyes based on monochlorotriazine dyes or other non-vinylsulfonic reactive dyes have a colored reserve or colored phrases is formed. In the latter case, the colored dyes are used for the print pattern as different colored printing inks as well as the reserve or etching ink individually assigned ink channels one Inkjet print head in a grid pattern sprayed onto the sample area. The reserve or etching ink can be used processed as a spot color, with a piezo-based one Inkjet printer is used.

• – Reservierungsmittel auf Basis von Natriumhydrogensulfit, Sulfitaddukten, Thioharnstoff und Zu bereitung davon, mit einer Leitfähigkeit von < 60 mS/cm im Endprodukt;
• – Viskositätsregulator auf Basis von Polyethylenglykol und anderen Glykolen und Verdickungsmitteln zur Einstellung einer Viskosität von 2 bis 10 mPas;
• – Nichtionisches Tensid zur Einstellung einer Oberflächenspannung im Bereich von 20–50 mN/m;
• – 0–200 g/kg hygroskopische Zusätze, wie beispielsweise Harnstoff oder Glycerin;
• – Demineralisiertes Wasser;
• – Konservierungsmittel wie Formaldehyd.

A preferred composition of the reserve ink contains the following components:

• - Reserving agents based on sodium hydrogen sulfite, sulfite adducts, thiourea and preparation thereof, with a conductivity of <60 mS / cm in the end product;
• - Viscosity regulator based on polyethylene glycol and other glycols and thickeners to set a viscosity of 2 to 10 mPas;
• - Nonionic surfactant for setting a surface tension in the range of 20-50 mN / m;
• - 0-200 g / kg hygroscopic additives such as urea or glycerin;
• - Demineralised water;
• - Preservatives such as formaldehyde.

A suitable etching ink contains instead the reservation agent is a reducing agent, especially sulfoxilates to destroy of the basic dye.

Before use, the ink should be degassed by ultrasound to ensure an undisturbed flow through the ink channels to ensure.

Below are some process variations for reserve pressure explains:

Example 1 - form reserve

The textile is pre-padded with a thickener solution based on natural alginates or based on synthetic thickener systems and then dried. The pre-block fleet is composed as follows:
5-50 g / kg Na alginate as a thickener;
0–150 g / kg urea to increase the depth of color;
3 g / kg complexing agent, for example based on polyphosphates;
x g / kg water demineralized.

The squeezing effect should be around 80% lie.

On the stuffed goods, how described above, with the inkjet printer the reserve ink and if necessary additionally Monochloro-triazine-colored dyes printed.

• – Fondfarbstoff auf Basis von Vinylsulfonen;
• – Alkali (Natriumhydrogencarbonat, Soda, Wasserglas, Pottasche);
• – Migrationsverhinderer (Salz- bzw. Verdickungsmittelzusätze).

The goods are then padded with a padding liquor of the following composition:

• - Fund dye based on vinyl sulfones;
• - Alkali (sodium hydrogen carbonate, soda, water glass, potash);
• - Migration inhibitor (salt or thickener additives).

Prescription example:

10-80 g / kg vinyl sulfone dye as a stock;
5–50 g / kg alginate as migration inhibitor;
0–100 g / kg sodium carbonate or other alkali donors (sodium hydrogen carbonate, soda, water glass, potash);
x g / kg water.

The squeezing effect should be approx. 80% be.

The fixation takes place under saturated steam conditions or with superheated steam in 2 to 10 minutes. Subsequently the prints are washed out at the boil, as is usual with reactive dyes.

Example 2 - Overpressure reserve with alkaline dispenser

The goods are padded with a padding liquor that contains an alkali dispenser (sodium trichloroacetate or sodium hydrogen carbonate) and the vinyl sulfone dye intended for the fund as well as an anti-migration aid, according to the following recipe example:
10-80 g / kg vinyl sulfone dye;
0-150 g / kg urea;
3-20 g / kg phosphate;
5-50 g / kg alginate;
10–100 g / kg alkaline dispenser;
xg / kg water.

After careful drying under 100 ° C Reserve ink and colored illumination dyes with inkjet technology printed at the same time. Then the goods are fixed and washed out as described above.

Example 3 - Overpressure reserve without alkali dispenser (2-phase process)

The goods are made with a backing dye and Padding liquor containing alginates or synthetic thickeners padded and then dried.

Recipe example for the pre-block fleet:

10-80 g / kg vinyl sulfone dye;
0-150 g / kg urea;
0-10 g / kg Ludigol;
5-50 g / kg alginate;
2 g / kg monosodium phosphate (pH 6-7) as a buffer;
xg / kg water.

The block goods are described as described printed with the inkjet printer.

The prints are used for fixing an alkaline and saline padding liquor padded and then fixed in saturated steam.

Recipe example for the padding fleet:

0-100 g / kg Glauber's salt;
5-150 g / kg soda;
0-50 g / kg potash or other alkaline dispenser;
0-30 g / kg sodium bicarbonate;
x g / kg water.

Example 4 - Color reserves

With all three variants, too Colored reserves prepared according to the procedure described above become.

Claims (25)

Textile printing method in which a textile fabric is preferably dyed dark with a basic dye and is provided in a pattern area at a pressure pattern, characterized in that the pattern portion is applied by ink jet printing with a reserve ink, the reserve ink in the pattern region, a permanently fixing prevent the basic dye. A method according to claim 1, characterized in that the Reserve ink a reservation agent based on sulfites, sulfite adducts, Contains thiourea or preparations thereof. Textile printing process in which a textile fabric preferably colored dark with a basic dye and is provided with a printed pattern in a pattern area, thereby characterized that the pattern area by using inkjet printing an etching ink is applied, the etching ink destroyed the basic dye in the pattern area. A method according to claim 3, characterized in that the etching ink to destroy of the base dye contains reducing agents, especially sulfoxylates. Method according to one of claims 1 to 4, characterized in that that the base dye is formed by a vinyl sulfone dye is. Method according to one of claims 1 to 5, characterized in that that the fabric through a padding process before or after applying the reserve or etching ink entire area colored with the basic dye becomes. Method according to one of claims 1 to 6, characterized in that that the textile fabric preferably by exposure to saturated steam of a fixing treatment is subjected. A method according to claim 7, characterized in that at the fixation treatment, a pH regulator, preferably from the group Soda, hydrogen carbonate, sodium hydroxide solution, water glass or potassium carbonate is activated. Method according to one of claims 1 to 8, characterized in that that the print pattern as a white reserve or white etchings becomes. Method according to one of claims 1 to 8, characterized in that the print pattern is formed as a color reserve or color sets by applying color dyes, preferably based on monochlorotriazines. Method according to one of claims 1 to 8, characterized in that that a preferably multicolored printing ink for the printing pattern and the reserve or etching ink over various ink channels of a digitally controlled inkjet printer sprayed onto the pattern area. Method according to one of claims 1 to 11, characterized in that that the reserve or etching ink according to the spot color principle applied a separate ink channel of an inkjet printhead becomes. Method according to one of claims 1 to 12, characterized in that that a piezo-based inkjet printer is used becomes. Method according to one of claims 1 to 13, characterized in that that the reserve or etching ink a viscosity regulator based on glycols, especially polyethylene glycol or polyacrylates contains. Method according to one of claims 1 to 14, characterized in that that the reserve or etching ink a viscosity in the range of 2 to 10 mPas. Method according to one of claims 1 to 15, characterized in that that the reserve or etching ink a preferably nonionic surfactant for adjusting the surface tension contains. Method according to one of claims 1 to 16, characterized in that that the reserve or etching ink a surface tension in the range of 20 to 50 mN / m. Method according to one of claims 1 to 17, characterized in that that the reserve or etching ink hygroscopic additives, such as urea or glycerin contains. Method according to one of claims 1 to 18, characterized in that that the reserve or etching ink contains a preservative such as formaldehyde. Method according to one of claims 1 to 19, characterized in that that the reserve or etching ink demineralized water as a carrier contains. Method according to one of claims 1 to 20, characterized in that that the conductivity of the Reserve or etching ink is less than 60 mS / cm. Method according to one of claims 1 to 21, characterized in that that the reserve or etching ink is degassed with ultrasound before use. Reserve ink for application to a textile fabric by inkjet printing, containing a preferably based on Reservite formed for sulfites or sulfite adducts Fixation inhibition of a basic dye. Ätztinte for application to a textile fabric by inkjet printing, containing a reducing agent, in particular sulfoxylates to destroy a Basic dye. Use a reserve or etching ink according to one of the previous ones Expectations for the digital Textile printing on a dark background using inkjet technology.