Single Screw Presses:
Work very well when the raw material is fresh and easily pressable, but these presses some times have the problem that the material "rotates" with the screw and does not move forward. Cheaper and easier to maintenance.
ASTW have redesigned the single screw presses to perform as good as the twin screw presses.The advantage of the single screw presses is the simple design and easy maintenance, and therefore low price. The ASTW Single screw presses have a very strong and sturdy design for long lifetime.
In OFP = Oily Fish Plants the raw fish must be properly cooked to 95 °C. before processing. The press with separate in solids "press cake" which goes to the fish meal drier and the liquids "press water" which goes to decanter and separated to separate fish oil, some meat sludge solids which goes to the drier and stick water which contains some dissolved proteins to be recovered in the drier or in combination with a WHE = Waste heat evaporator.