The differences between the TX800 and DX7 inkjet printers

The Epson TX800 and DX7 printheads both employ micro-electro-mechanical inkjet technology. They generate volume changes in the ink chamber through piezoelectric ceramics to achieve ink droplet ejection. There are significant differences between the two in terms of nozzle structure, driving method, ink droplet control capability, ejection stability, and application fields. 
I. Working Principle of the Sprayer 
Both types of nozzles are based on the micro-electro-mechanical principle. The interior of the nozzle consists of piezoelectric elements, nozzle plates, ink chambers, and flow channels. After the driving signal is applied to the piezoelectric ceramic sheet, the piezoelectric material undergoes deformation, causing a change in the volume inside the ink chamber. A decrease in volume generates positive pressure, causing ink droplets to be ejected from the nozzle; when the driving waveform is restored, the ink chamber generates negative pressure, replenishing the ink from the ink supply system. The variable ink droplet technology achieves different volumes of ink droplets by changing the amplitude and duration of the driving waveform, thereby achieving higher grayscale control capabilities. 
Although the two have the same principle, there are differences in the range of driving parameters, the manufacturing accuracy of the nozzles, the jetting linearity, and the ink compatibility, which directly affect the final output quality and stability. 
II. Differences in Spray Head Structure and Spray Performance
1. Number and Arrangement of Nozzles 
TX800

Eight-channel structure. 
There are 180 nozzles in each channel. 
Nozzle density normalization, suitable for medium-resolution output. 
DX7

Eight-channel structure. 
There are 180 nozzles in each channel. 
The processing accuracy and alignment consistency of the nozzles are higher than those of the TX800, and the position stability is better. 
2. Droplet Control Capability 
TX800

The variable ink droplet range is typically from 3.5 pl to 21 pl. 
The grayscale control capability is at the level of commercial use. 
DX7

The smallest ink droplet can be maintained at around 3.5 pl, but the ink droplet volume control is more stable. 
The multi-level gray-scale linear technology is superior to TX800 and is suitable for high-precision image output. 
3. Materials and Resistance to Solvents 
TX800

Mainly applicable to aqueous and weak solvent systems. 
The tolerance to corrosive ink is limited. 
DX7

The material compatibility is stronger than that of TX800. 
More suitable for weak solvents, partially environmentally friendly solvents and dedicated ink systems. 
4. Spray Stability and Lifespan 
TX800

The design is targeted at commercial use as a sprinkler head. 
The working duration is relatively short and it is sensitive to the usage environment. 
DX7

Industrial-grade nozzle design. 
It operates stably at high speed for a long time, and maintains strong consistency in both the spraying frequency and the landing point. 
III. Application Scenario Differences
1. Application Scenarios of TX80 
Water-based photo printing equipment 
Weak solvent advertisement machine 
UV desktop printer (for some models) 
Fabric and paper printing 
Cost-sensitive equipment 
It is mainly used for printing systems that have moderate production demands, appropriate resolution requirements, and are sensitive to the cost of the nozzles. 
2. Application Scenarios of DX7 
Low-solvent photo printing 
Commercial advertising output equipment 
High-precision image printing equipment 
Long-term continuous production type industrial equipment 
A production environment that requires stable gray-scale and high drop-point accuracy 
The DX7 is more suitable for applications that have strict requirements for production stability, printing accuracy and nozzle lifespan. 
IV. Summary of Position Differences

Both TX800 and DX7 adopt the micro-pressurized inkjet principle. However, DX7 significantly outperforms TX800 in terms of nozzle processing accuracy, variable ink droplet linearity, stability, material compatibility, and industrial continuous working capacity. TX800 is more suitable for cost-sensitive and medium-print-volume scenarios; while DX7 is suitable for commercial-level and industrial-level printing equipment that requires higher precision and stability.