Seiko Printheads

The SPT1020 is essentially a higher-resolution version of the SPT510 design. It combines two SPT510-35PL printheads, increasing the nozzle count from 510 to 1,020 and the native resolution from 180 to 360 npi, while retaining a 35 pl drop size and 72 mm print width. This makes SPT1020 better suited to applications requiring higher coverage and finer output.

Both models have 510 nozzles, a print width of about 72 mm, and support oil-, UV-, and solvent-based inks. The main difference is drop volume and firing frequency: the 510-35PL uses a 35 pl drop at up to 8.29 kHz, while the 510-50PL uses a larger 50 pl drop at 6 kHz. The 50 pl version is better suited to applications where higher ink deposition and production output are more important than fine detail.

“RC” stands for “Recirculation.” Seiko RC printheads use continuous ink circulation through the head to maintain more stable ink flow and help reduce problems caused by pigment settling, air, or nozzle clogging. This design is particularly useful for demanding industrial printing applications where consistent jetting is required during long production runs.

An ink recirculation system keeps ink moving inside the printhead instead of allowing it to remain stagnant in the channels. This helps reduce sedimentation and supports more consistent ink delivery to the nozzles, which can improve long-run printing stability and reduce the risk of clogging. The SPT510 series, for example, uses an internal recirculation system to support stable ink flow and long-term reliability.