What You Need to Know
The process hinges on the rheology of protein‑based inks, which must maintain a viscosity of 100–1,000 Pa·s at 20–30 °C to allow reliable extrusion while preventing premature gelation. Upon cooling to 5–10 °C below the gelation point, the inks undergo physical cross‑linking, forming a stable hydrogel network that preserves the printed geometry. Hydrocolloids such as xanthan gum or carrageenan lower the required printing temperature by up to 5 °C, expanding the range of printable proteins and improving energy efficiency.
The Science
Primary Reaction
gelation and physical cross‑linking of protein‑hydrocolloid inks upon cooling