Improved Continuous Inkjet for Selective Area Coating Using High‐Viscosity Insulating Inks

Abstract

While drop‐on‐demand (DOD) inkjet has been broadening its applications, especially in manufacturing sectors such as printed electronics, continuous inkjet (CIJ) has been limited to use in conventional graphics and marking areas. So far, there have been few attempts to use functional materials in CIJ printing despite the advantages of its high‐speed printing capability and relatively low implementation costs. Herein, the performance of CIJ in terms of printable ink viscosity, print area, and printing speed is significantly improved. For demonstration, selective area printing methods using insulation inks are presented. The selective area coating is very difficult to implement since charged droplets becoming closer together can increase undesirable charge repulsion effects among them. To reduce the charge interaction among the charged droplets and maximize the printing efficiency, a new voltage driving scheme for selective area coating applications is proposed.

Graphene-Based Inks for Flexible Supercapacitor Electrodes: A Review

“…However, its few limitations include complexity in controlling jetting and deflection of the ink. 83,84 The core of inkjet printing technology is a well-prescribed ink. The viscosity and surface tension are the most critical characteristics of the ink, as they affect the size of ink droplets.…”

“…Among both these methods, continuous inkjet printing allows higher jetting speed, thus providing higher efficiency. However, its few limitations include complexity in controlling jetting and deflection of the ink. , …”

Recent progress in the development of conductive hydrogels and the application in 3D printed wearable sensors

“…Nonetheless, because of the continuous production of ink, CIJ's printing speed is much faster than the DOD mode. 194 Reactive inkjet 3D printing is a technology that sprays one or more reactants onto a substrate containing another reactant and uses physical or chemical reactions between them to form products in situ. 195,196 Traditional reactive inkjet 3D printing techniques can be divided into single-reactive inkjet printing and full-reactive inkjet printing, as shown in Fig.…”

“…Nonetheless, because of the continuous production of ink, CIJ's printing speed is much faster than the DOD mode. 194…”

Recent advances in inkjet-printing technologies for flexible/wearable electronics

“…Therefore, the deposition position of the ink droplets can be easily controlled by tailoring the charging voltage, which can be calculated by linear regression of the visualized deflection of droplets. 38 While the uncharged droplets are not deflected when they pass through the electromagnetic field and go directly into the ink collector, where they can be used again after filtering. 37 The whole process is shown in Fig.…”