The extrusion trials were performed using a Werner and Pfleiderer Continua 37 twin-screw co-rotating extruder (Stuttgart, Germany), fitted with a circular die with a diameter of 4 mm, under
the following process conditions: feed rate of 16–24 kg/h, water
feed of 8.2–22%, screw speeds of 330–332 rpm with the barrel temperatures being set in two zones 80 C and 120 C at the beginning
and end of the barrel, respectively.