Our Solution

Our solution allows to identify optimums and unstabiltites in large datasets of printing parameters based on dropwatching. We develop our own software to automatically test, record and compare large datasets of waveforms, inksystem parameters and ambiant conditions. The storage of all the parameters and outcomes in a database guarantes a fully reproducible and transparent workflow.

Applications

Our solution can emulate most printing setups for optimizations and analyzes from one common interface. It allows performance comparisons accross different printheads and inks in a fully transparent and reproducible workflow.

Waveforms design

Both analog and digital waveforms can be controlled and optimized. All waveform parameters (amplitudes, durations and slew rates) can be swept automatically to measure their effect on the drop properties.

Examples of digital and analog waveforms. Red: mother waveforms. Blue: daughter waveforms.

Automatic sweep of printing parameters

The printing parameters to measure are defined in a table that allows the sweeping over one or more parameters autoamtically. Thousands of dropwatching images can be acquired within a single test session.

Example of the parameters set for one test session.
Example of the parameters set for one test session.

Drop features extraction and storage

The drop features, such as speed, volume and shape, are automatically extracted from the dropwatching images. These features are then stored in our database together with all the test parameters and sensor inputs (temperatures, misting).

Optimizations

The optimizations steps are tailored to the specific needs of each applications. The most common applications are listed as follows:

  • Basic optimization, for relatively low printing frequencies with stable inks.
  • High-performance optimization, where the printhead is pushed to its maximal throughput and stability is key.
  • Latency optimization, for applications where the drying of the ink in the nozzles is specificially adressed.
  • Full printhead optimization, where the performances of every single nozzle will be evaluated over longer durations.

Acoustic time

Acoustic time optimization. Left: trapezoidal waveform with a pulse duration sweep. Right: Plot of the drop speed as a function of the pulse duration. Quadritic fitting to identify a maxium a 2.17us.

Amplitude sweep

Number of elements as a function of the waveform amplitude. A number of elements >1 indicates the presence of satellite. Here the maximal votlage without satellites is at 75% of the reference voltage.