Digital Inkjet Textile Print Colour Fastness
topic
Digital inkjet textile print fastness testing applies standard ISO 105 methods to acid inkjet-printed silk and nylon, reactive inkjet-printed cotton, disperse inkjet-printed polyester, and UV-curable inkjet-printed technical textiles — with fastness performance dependent on ink chemistry, substrate preparation (pre-treatment coating), fixation method (steam, UV cure, heat), and post-treatment wash-off quality. Acid ink on silk (Mimaki, Kornit, MS LaRio): pre-treatment with aluminium sulfate or urea coating; steam fixation 100°C, 15 min; wash-off 50°C Launder-O-Meter — washing fastness grade 3–4 (silk acid ink equivalent to conventional acid print); light fastness grade 4–5; wet crocking grade 3 (silk smooth surface means higher dye surface concentration than conventional screen print — more crocking transfer). Reactive ink on cotton (CMYK + additional colours, pre-treatment sodium alginate and soda ash, steam fixation 102°C, 8 min, wash-off 60°C): washing fastness grade 3–4 (equivalent to screen-printed reactive); light fastness grade 4–5; wet crocking grade 3–4. Disperse ink on polyester (thermosol fixation 190–210°C, 30 sec for direct print; transfer paper sublimation 200°C, 45 sec for paper transfer method): washing fastness grade 4–5 (excellent — disperse dye inside polymer matrix, water-inaccessible); light fastness grade 5–7; wet crocking grade 4–5. Digital print fastness versus screen print fastness comparison: digital reactive on cotton ISO 105-C06 grade 3–4 = equivalent to conventional screen reactive — digital gap is not fastness but colour gamut (digital achieves 70% CMYK gamut versus 100% for 12-screen conventional) and speed-cost crossover (digital faster for <500 m runs, screen more economical for >5,000 m). UV-curable inkjet on technical textiles (banner fabrics, PVC-coated substrate): ISO 105-B02 light fastness grade 6–7 (UV-stabilised inks for outdoor signage 2–5 year rated service life) — crosslinked UV polymer matrix provides outstanding wash and abrasion fastness but limited textile handle.
Role
Digital inkjet print fastness testing validates the colour performance of the fastest-growing textile print technology — with digital print volume growing at 12% annually versus 2% for conventional screen printing, fastness testing data for each ink-substrate-fixation combination provides the quality certification needed to justify digital print premiums ($8–25/m² versus $2–6/m² conventional) to brands transitioning from conventional to digital production for sustainability and short-run flexibility benefits.