SCREW EXTRUDER FOR SUPER-HIGH MOLECULAR POLYETHYLENE POWDER EXTRUSION MOLDING

摘要

PURPOSE:To enable even and stable extrusion molding of a super-high molecular polyethylene powder by applying a specified grooving to a barrel along with the use of a full flight type screw. CONSTITUTION:A full flight type screw extruder with the L/D of 20-36 has a cooling mechanism 26, a barrel 2 having a heating mechanism at compressing sections 23-24 and weighing sections 24-26 and a full flight type screw 3 with the L/D of 25-80% in the length of the compressing sections 32-33, the compression ratio of 1.0-2.5 and a flight pitch 0.4-1.0D along with a groove 21 formed on the downstream of a hopper 4 at 10-40% in the L/D. Thus, a screw of a specified shape is used with the grooving range limited thereby enabling an even and stable extrusion molding of a super-high molecular polyethylene powder.