| 参数 | 021 MH5320 | 022 MH5420 | 023 MH5421F | 024 MH5421MF | 025 MH5440 | 026 MH5441 | 027 MH5420F | 028 MH5420MF | 029 TH5241 | 030 MH2810 |
| Brand | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh | Ricoh |
| Architecture | Piston Pusher | Piston Pusher | Piston Pusher | Piston Pusher | Piston Pusher | Piston Pusher | Piston | Piston | Piezo | Piezo |
| Actuator | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | Metallic diaphragm | N/D | N/D |
| Nozzles | 1,280 class | 1,280 | 1,280 | 1,280 | 1,280 | 1,280 | N/D | N/D | N/D | N/D |
| Rows | 4 × 320 | 4 × 320 | 4 × 320 | 4 × 320 | 4 × 320 | 4 × 320 | N/D | N/D | N/D | N/D |
| Width | ~54.1 mm | 54.1 mm | 54.1 mm | 54.1 mm | 54.1 mm | 54.1 mm | N/D | N/D | N/D | N/D |
| Nozzle Pitch | 0.1693 mm | 0.1693 mm | 0.1693 mm | 0.1693 mm | N/D | N/D | N/D | N/D | N/D | N/D |
| Drop | 7–35 pL | 7–35 pL | 7/14/21 pL | 7/14/21 pL | N/D | N/D | N/D | N/D | N/D | N/D |
| Frequency | ~30 kHz | ~30 kHz | 30 kHz | 30 kHz | N/D | N/D | N/D | N/D | N/D | N/D |
| Heater | Yes/variant | Yes | Yes | Yes | Yes | Yes | N/D | N/D | N/D | N/D |
| Circulation | Variant | Yes | Yes | Yes/variant | N/D | N/D | N/D | N/D | N/D | N/D |
| Typical Viscosity | N/D | N/D | 11 mPa·s | 6 mPa·s | N/D | N/D | N/D | N/D | N/D | N/D |
| Ink | UV / solvent / aqueous variants | Industrial | Aqueous | Aqueous | Industrial | Aqueous | N/D | N/D | Industrial | Industrial |
| One Pass | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★ | ★★★ | ★★★★ | ★★★ |
| White Ink | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★★ | ★★★ |
| High Viscosity | ★★★★ | ★★★★ | ★★★★ | ★★★ | ★★★★ | ★★★★ | ★★★ | ★★★ | ★★★★ | ★★★ |
| Functional Fluid | ★★★★ | ★★★★ | ★★★★ | ★★★ | ★★★★ | ★★★★ | ★★★ | ★★★ | ★★★★ | ★★★ |
| GTF Glue | ★★★ | ★★★ | ★★★★ | ★★★ | ★★★ | ★★★ | ★★★ | ★★★ | ★★★ | ★★★ |
| Main Advantage | Versatility | Industrial maturity | Heater + circulation | Lower viscosity | Multi-color | Multi-color | — | — | Industrial | Industrial |
| Ricoh 的 MH5421 官方资料确认其结构为 piston pusher with metallic diaphragm plate， 1280 nozzles、4×320 staggered、54.1 mm、30 kHz、7/14/21 pL，并带 integrated heater + thermistor； 公开资料给出的 viscosity range 为 11 mPa·s。 |
||||||||||
| Ricoh 的工程定位 | ||||||||||
| Ricoh 不应该简单归类为“高粘度喷头”。 | ||||||||||
| 更准确的是： | ||||||||||
| Industrial general-purpose printhead + heater + fluid compatibility + robust actuator | ||||||||||
