Piezoelectric Print Heads Vs. Thermal Print Heads

Piezoelectric Print Heads Vs. Thermal Print Heads

How does Epson’s Micro Piezo print head work?

In the Epson Micro Piezo print head, microscopic piezoelectric elements (like crystals and ceramics) are built behind the print nozzles. When an electrical charge is applied to them, these elements bend backward, forcing precise amounts of ink onto the substrate (see Diagram 1). Because electrical charges can be turned on and off like a switch, there is a vast amount of control over the rate of ink being ejected through the nozzle while also creating perfectly spherical dots at different droplet sizes.

epson wide-format inkjet print head

How does the Canon’s Thermal Print head work?

Thermal inkjet technology uses heat, (didn’t see that coming!) as opposed to electricity, to force ink from the print head to the substrate. Conceptually similar to the way water bubbles when boiled, thermal inkjet technology works by electrifying microscopic resistors behind the print nozzle, creating an intense heat that vaporizes the ink to create a bubble that expands so rapidly the ink literally explodes onto the paper. After ejecting ink, the chamber then cools quickly to allow more ink to refill the chamber and the process is repeated.

Fun Fact: The ink in a thermal print head is, for a nanosecond, close to a million degrees centigrade – hotter than the surface of the sun!


epson wide-format inkjet print head

Comparison

Piezo Thermal
Pro’s
  • Precise and Variable Droplet Sizes
  • Can use wide range of inks due to low temperature (solvent, UV, pigment, dye)
  • Droplet sizes down to 1.5 picoliter
  • Run longer due to cooler temperature
  • Less Expensive Print Heads
  • More Print Heads Per Printer
Con’s
  • More Expensive Heads
  • Fewer Print Heads Per Printer
  • Only 2 different droplet sizes
  • Larger droplet size
  • Limited ink options due to extreme heat
  • Need to be replaced more often due to high heat

Each print head has its advantages and disadvantages. Based purely on a print quality comparison, the Epson wins. Since the Micro Piezo print head can be controlled more precisely and is able to vary droplet sizes, it provides a sharper, grain-free print, with smoother tonal transitions. The Micro Piezo print head is ideal for photo and fine-art reproduction.

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