Centering system for extruder nozzle producing tubing w.r.t relaxation properties melt

摘要

Extruding tools with a circular nozzle are centred, using a main part round a mandrel and the nozzle; two eccentric rings are fixed axially between the shoulder on the main part and the nozzle piece; these rings are turned about the axis of the extruder tools, each rings having a drive arrangement.In the figure the layout has the inner nozzle mandrel, pref with annular nozzle and a device to centre the nozzle piece comprising two eccentric rings. These are turned about the centre axis by separate devices.The system to turn them has teeth and is round the circumference of the rings. Both rings have marks to indicate their positions. A low friction ring is located between the inner ring and nozzle piece to minimise wear.