Patent ID: 6406174
Filing Date: 2002-06-18
Classification: B29C

Abstract:
A process for controlling the degree of attrition of a sealing screw conveying a plasticized material against a resistance body, which sealing screw is bearingly supported within a screw housing between a first screw section and a second screw section disposed axially spaced apart from each other, the pitch of the threads of the sealing screw being directed opposite to the pitch of the first and second screw sections wherein a first housing section of the first screw section and a second housing section of the second screw section are interconnected by a connection channel leading the material conveyed by the first and second screw sections, a station for processing the material flowing within this connection channel being connected to the connection channel, and wherein the resistance body is disposed between the sealing screw and that place at which the connection channel branches off the first housing section of the first screw section through which the material flows at first, wherein the pressure of the material conveyed by the first screw section and the pressure of the material conveyed by the sealing screw are measured in front of the resistance body and whereby the difference of the two pressures is used for indicating the degree of attrition.