Pre-treatment liquid for liquid absorbing printing substrates

Abstract

Liquids for the pre-treatment of liquid absorbing substrates, in particular textiles or garments, in printing processes are disclosed, said liquids being based on water and / or a low molecular alcohol and including small amounts of an organic acid and / or other reagents to increase dye fixation as well as at least one corrosion inhibiting agent selected from a group containing quaternary ammonium salts, derivates thereof and their corresponding organically substituted amines, hydroxy substituted acetylenic components and derivates thereof, carboxylic, dicarboxylic and polycarboxylic acids, long-chain carboxylic, dicarboxylic and polycarboxylic acids and separated fractions and derivates thereof, sulfur containing heterocyclic compounds and derivates thereof, nitrogen containing heterocyclic compounds and derivates thereof, nitrite and nitrate salts of metal ions, organic nitrites and nitrates, organic nitrogen compounds and reductive nitrogen containing compounds. Preferably the concentration of the corrosion inhibiting agent is between 0.01 wt. % and 10 wt. % and the surface tension of the liquid between 15 mN / m and 70 mN / m.

Description

technical field [0001] The present invention relates to a pretreatment liquid for absorbent printing substrates. In particular, the invention relates to pretreatment liquids for direct-to-garment printing. Background technique [0002] The application of liquid inks to liquid-absorbent printing substrates is a well-known printing technique which prints patterns, lettering or pictures with high definition onto said substrates. Printable absorbent substrates are, for example, paper, cardboard, woven or nonwoven materials, elongate materials, textiles, garments and the like. A known printing process using liquid inks is, for example, inkjet printing. Inkjet printing is broadly performed in two different ways: (1) continuously ejecting pressurized ink through a nozzle, or (2) using droplet-by-droplet addition only where such ink droplets are needed to form a printed image (droplet-by-droplet) approach. The latter is generally performed using the so-called drop-on-demand tech...

AI Technical Summary

Problems solved by technology

[0006] However, known pretreatment liquids are corrosive due to the presence of organic acids in them and the often presence of ammonium salts and / or halide ions in these liquids

It has been found that the known pretreatment liquids lead to corrosion of non-corrosion-resistant parts in printing installations and in particular in printing presses by direct contact and notably also by indirect contact with these liquids

These generally lead to increased service and repair costs and unwanted downtime of printing presses or other printing facilities