Quality of steam is crucial to quality of extruded feed. Generally speaking, it is appropriate to keep the pressure of saturated steam between 0.4Mpa and 0.5 Mpa, with volatility of pressure less than Mpa. So the pressure of the boiler should keep between 0.6Mpa and 0.8 Mpa, and shorten the distance between the boiler and the extruder. What’s more, the quality of the water is also vital to the quality of the extruded feed.