Extruder
Cold Extruder / Dry Expander
![dry feed extruder](/image/feed-extruder-dry.jpg)
Cold extruder is also known as dry expander. It use extrusion theory to realize the expanding of materials.
Hot Extruder / Wet Expander
![wet feed extruder](/image/feed-extruder-wet.jpg)
Hot extruder is also known as wet expander. It add steam when conditioning, which is an advanced feed milling equipments.