The Ricoh MH5421MF and Ricoh MH5421F printheads are designed for both low viscosity (6 mPas) and medium viscosity fluids (11 mPas) respectively. These printheads enable highly stable jetting performance through the incorporation of an ink recirculating structure. This structure enables continuous ink flow directly behind the nozzle, reducing the risk of jetting failure caused by either clogged ink or entrapped air bubbles.
Each printhead has enhanced bonding technology for improved durability. With these new features, the Ricoh MH5421 MF and MH5421F printheads offer enhanced compatibility with a wider range of fluids. These features, according to Ricoh, result in increased reliability for single-pass printing; increased reliability for systems with rapid setting ink, such as pigment ink, white or metallic materials; increased reliability for systems with fast drying ink; and removal of air bubbles in the ink chamber to achieve self-recovery from jetting failure.
