croissants (and any other delicate pastry) require precise humidity and temperature control for reliable results. Think PID controllers which control the heat/

croissants (and any other delicate pastry) require precise humidity and temperature control for reliable results. Think PID controllers which control the heat/humidity through the baking cycle, or, conveyer-based systems with zones of specific temperature/humidity. In addition, very modern systems, they are using computer vision systems to dynamically analyze the baking to ensure perfect doneness. More repeatable results with less skilled labor is less waste is more profits.