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This paper is concerned with the quality of lines and disperse ink in printing patterns on different untreated polyester fabric constructions. The lines running in the weft and warp directions were printed on polyester fabric constructions, and printing accuracy was assessed. Ink spreading is one of the important factors that influences the ink distribution. Thus, in order to acquire satisfactory ink‐jet printing products, it is essential to control the spreading of ink on the polyester fabric. To meet these conditions, a series of chemicals (disperse dye 5.01 wt%, PVP‐K30 0‐2 wt%, DEG 5‐20 wt%, water 64.17‐79.17 wt%, etc) with different mass fractions was used to prepare disperse ink. The jetting behaviour of ink was related to its surface tension and viscosity, which was characterised by an automatic surface tensiometer and rotational viscometer. Line profile was used to evaluate the printing effect. Low field nuclear magnetic resonance and three‐dimensional super depth digital microscopy were used to reveal the relationships between the state of water, ink diffusion behaviour and printing sharpness. The results showed that increasing ink viscosity or decreasing free water content is advantageous to improve the sharpness of the printing pattern. The effects of fabric structural parameters on line image quality are discussed. The printing quality was closely related to the weight and structure of fabric. The heavy weight fabrics had accurate print pattern sharpness. The fastness test results showed that the ink printing pattern had good colour fastness. [ABSTRACT FROM AUTHOR]

The water retention of printing inks is of the utmost importance. According to low -field nuclear magnetic resonance (LF-NMR) to detect the behavior of polyols and water, polyols with excellent water retention performance can be selected quickly. The water retention of disperse ink is closely related to the intramolecular/intermolecular forces of each component in the disperse ink. The relationship between each component of the ink is revealed by LF-NMR. The water retention of ink was also evaluated by LF-NMR. Therefore, the LF-NMR was able to design ink formulation and evaluate ink quality. Compared with NNO and TD-1109, Surfynol CT-136 had a higher grinding efficiency for disperse dyes. The physicochemical properties of disperse ink was evaluated to meet the requirements of inkjet printing ink. The rheological properties of the disperse inks were characterized by rotary rheometer, which were confirmed as Newtonian fluid; The quality of the ink-jet printing pattern is closely related to the ink jet performance. The formation process of the ink droplet and the parameters of the ink droplets were observed by the ink droplet observer. The ink has excellent jetting properties and a high-quality print pattern at an appropriate viscosity (3.1 mPa.s) and surface tension (34.2 mN/m). The excellent affinity between NVP/VA copolymer (NVP/VA64) and disperse dyes was confirmed by ultraviolet spectrophotometer (UV spectrophotometer). The scanning electron microscope (SEM) images of printed fabrics show that there is a film on the surface. The NVP/VA copolymer can be used as a carrier for disperse dye to improve the fixation and fastness of disperse dye in polyester fabrics. [ABSTRACT FROM AUTHOR]

A novel high-temperature disperse dye-based ink, designed for direct digital printing on fabrics, has been developed to eliminate the need for chemical pre-treatment. This innovative ink utilizes a temperature viscosity response mechanism and incorporates a new thermosensitive dye, enabling direct printing on polyester fabrics without pre-chemical treatment. The key to its temperature viscosity response properties is the addition of the nonionic surfactant L64 (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) PEO-PPO-PEO). Extensive evaluations of its physicochemical properties, including viscosity, conductivity, pH, surface tension, particle size, and inkjet droplet formation, have confirmed the ink's superior sprayability and overall quality. Notably, when applied to polyester fabric, this ink enhances print clarity and pattern quality while ensuring robust color fastness to rubbing and washing, all without requiring fabric pre-treatment. Furthermore, a comparative analysis of the hand feel between fabrics printed with this ink and unprinted fabrics underscores the minimal impact of the printing process on the fabric's texture. This new type of thermosensitive ink application can effectively reduce the dependence of textile printing fabrics on chemical pretreatment, and effectively reduce the use of water resources in the printing process. • Triblock copolymer (PEO-PPO-PEO) is added to high temperature disperse dye ink. • This new type of thermosensitive ink is applied to polyester fabrics without the need for chemical pretreatment steps. • Thermal ink has good spraying performance. • The fabric printed with thermosensitive ink exhibits excellent printing accuracy and color fastness. [ABSTRACT FROM AUTHOR]

We report an improved printing ink of polyester fabric employed in the production process of inkjet printing. In the design of printing ink, the solubility parameters of reagent and HLB value of surfactant are used to prepare the ink. This production process does not require the pretreatment of polyester fabric to directly carry out inkjet printing. By regulating the intermolecular force relationship between the components of ink and the compactness of ink microstructure, it can improve the diffusion of ink on the surface of polyester fabric. The low-field NMR (LF-NMR) revealed the correlation between the fluidity and transverse relaxation time of main reagent solutions and ink. The test results show that there are three types of water: hydrogen-bond water, bound water and free water in main reagent solutions and ink. The LF-NMR was also used to investigate the relationship between ink viscosity and transverse relaxation time. It was observed that the transverse relaxation time (1084.4–410.3 m s, peak maximum time of T 22) of ink decreases with the increase of ink viscosity (2.3–11.1 mPa s). The viscosity and transverse relaxation time of ink is associated with the intermolecular force and the compactness of microstructure of ink. The formation of ink droplets was systematically observed by the ink droplet observation instrument. When the surface tension and viscosity of ink are 32.2–37.4 mN/m and 2.3–8.8 mPa s, respectively, the ink can be smoothly inkjet. With the increase of viscosity of the ink (2.3–8.8 mPa s), the sharpness of printing pattern is obviously improved, and the change rate of the line width (W) of the printing pattern is reduced from 52.6% to 4.4%. The microstructure of ink can bound the solvent of the ink, reduce the fluidity of the solvent, and improve the sharpness of the printing pattern. The test results of KES style and color fastness of the printed fabric show that the printed fabric fully meets the wearing requirements. Compared with other the soap liquid of printed fabric, the soap liquid of printed fabric RD-2B has strong UV absorption strength, the soap liquid RD-2B has a higher dye content. The characterization results of volatile organic compounds (VOC) in ink SDS R7 is 17.0 g/kg. The chemical oxygen demand (COD) values of printed fabrics RD-2B and SDS R7 are 150.0 and 102.0 mg/L, and the biochemical oxygen demand (BOD 5) values of printed fabrics RD-2B and SDS R7 are 130.0 and 97.7 mg/L. Compared with the common polyester fabric printing ink (ink RD-2B), the prepared ink has the characteristics of environmental protection, high production efficiency and low energy consumption, which has the potential to achieve green printing. [ABSTRACT FROM AUTHOR]

The study aims to investigate the effect of additives (poly (vinyl pyrrolidone) PVP, glycerol, ethylene glycol) on the performances of disperse water-based inks for ink-jet printing and how such additives interact with water. This should help into design suitable inks for textile printing by ink-jet printing, in particular for synthetic fibers such as polyester fabrics. Thirteen kinds of inks were prepared, and the glycerol content was replaced by water and PVP (K15, K30, K60), and the solubility parameter of the additive was calculated by the group contribution method. Low field nuclear magnetic resonance (LF-NMR) reveals the existence of bound water, intra-microstructure water, and extra-microstructure water in the ink, and the intra-microstructure water is entrapped inside the micro-structure formed by additives, mainly due to the presence of PVP. The optimal ink (Y5K30) has a low linewidth relative change (0.4%) and excellent sharpness. The reason is the existence of microstructure in ink, which reduces the mobility of solvent in ink and the diffusion of ink on fabric. PVP and disperse dyes have a strong affinity and help to improve the color depth and color fastness of the fabric. • The interaction between additives and water in ink was confirmed. • The microstructure of PVP was observed by SEM. • LF-NMR was adopted to reveal the existing water state of ink. • The microstructure of ink can reduce ink mobility and improve printing sharpness. [ABSTRACT FROM AUTHOR]