Patent ID: 9167846
Filing Date: 2015-10-27
Classification: A23G,A23P,B29C

Abstract:
1. An extruder comprising: a barrel and a screw mounted in the barrel for rotation, the screw comprising screw elements and the barrel comprising: an inlet toward one end for material to be extruded and an outlet for the material toward the other end; and a fluid inlet and a fluid outlet in the barrel wall, the fluid inlet and the fluid outlet being separated along the barrel wall in the longitudinal direction thereof and the screw elements either having i) a wider pitch or ii) a screw axle of smaller diameter for that portion of the screw between the fluid inlet and the fluid outlet than both upstream and downstream of the said portion, one of the fluid inlet and the fluid outlet being connected to a pump so that there is a pressure difference between the fluid inlet and the fluid outlet, wherein the fluid outlet is closer to the material outlet than is the fluid inlet.