Thermal Inkjet (TIJ) is an ink-printing technology that heats ink inside the printhead to produce tiny droplets that are ejected onto a surface. TIJ is widely used for date, batch, and code marking on packaging due to its high print quality and relatively low initial cost.

How it works

• TIJ uses a small resistive heater inside the nozzle. When the heater is heated, a vapor bubble forms that forces an ink droplet out of the nozzle toward the substrate.
• After the bubble collapses, the chamber inside the nozzle is refilled with ink from the cartridge.
• This process happens very rapidly (thousands to tens of thousands of droplets per second per nozzle).

Main advantages

• High print resolution — suitable for small text and fine-line graphics.
• Relatively easy maintenance; many units use plug-and-play cartridges.
• Does not require hazardous solvents in many applications (depending on the ink).
• Initial machine cost is generally lower compared to CIJ (Continuous Inkjet) or laser systems.

Limitations

• Production speed is highly dependent on configuration; for very high industrial speeds, CIJ or laser may sometimes be more appropriate.
• Limitations on certain substrates (e.g., very oily or textured surfaces).
• Printhead lifespan and the need for cartridge replacement should be taken into account.

When to choose TIJ

• Mid-scale production that requires high-quality printing (dates, batch codes, small barcodes).
• Applications that prioritize ease of use and quick consumable replacement.
• Food & beverage, pharmaceutical, and consumer goods industries that require clean and precise printing.

Conclusion TIJ is an efficient solution for many packaging marking needs, excelling in print quality and ease of operation, but it should be carefully considered for ultra-high-speed applications or challenging substrates.