1. ESSENTIAL ELEMENTS FOR INKJET PRINTING R.B.CHAVAN Dept. of Textile Technology Indian Institute of Technology Hauz-Khas, New Delhi 110016

8. Fabric pre-coat machine

9. Fabric Feeding System Fabric feeding Fabric Exit ensures perfect registration and alignment throughout, even for delicate and unstable fabrics such as knits or fine silks. If required, this machine may also pre-heat, dry or set the printed fabric, before finally rolling-up the output smoothly and with even tension.

10. Ichinose-unit: conveyor belt and dryer Ichinose uses a conveyor belt to transport and align the textile substrate. The conveyor belt carrying the fabric gently moves ahead for inkjet printing operation. The print head nozzles are set up right above the carrier belt, and the cloth printed with the inks sprayed from the head nozzles. This can prevent the inks from bleeding onto the cloth. After printing operation the cloth at the exit end is released from the conveyor belt. The conveyor belt can be cleaned whenever necessary

15. Typical operating parameters for ink-jet engines The average particle size of disperse ink must be approx. 0,5 micro meter or lower in order to avoid clogging of the nozzles. Electrostatic deflection systems also require that the ink is electrically conducting which is difficult to achieve in organic solvent based systems. 100 5-30 Piezo 200 1-3 Thermal 400 1-10 Continuous Drop volume Pico litre pl Viscosity cps Print Head

20. Commercial water-based inks Reactive Colorspan Colorspan Pigment (CMYK) Pigment + Binder Artistry 1000 Artistry 500 Dupont Acid Dorasyn Dohmenn Disperse Disperse 9Transfer) HC Pigment + binder Reactive MCT Acid Terasil (D) Terasil (T) Irgaphor TBI Cibacron Lanaset Ciba Pigment Disperse (Transfer) Reactive (MCT) Helizarine Bafixan Reactive Dyestar Type Trade name Supplier

21. Digital printing inks for different substrates No Polymerization Thermal, UV curing Pigment All fibres Yes HT steam Disperse Polyester Yes Steam Reactive/ Acid Silk, wool, Polyamide Yes Steam Reactive Cotton, Viscose After wash Aftertreatment (Fixation) Colorant Fibre

22. Ink formulation *Avoids drying out of the nozzles 10 Upto 10 Additives (Wetting and Antifoaming agents Dye 30 Max Solvent (Ethylene Glycol* < 80 Water Content % Component

28. Colour gamut with 4 and 6 inks outside: Hexachrome gamut Inside: CMYK gamut CMYK