Plastic hose, tube or sheet extrusion nozzle includes sensors for automatic centering and thickness adjustments

摘要

A layer thickness measurement sensor (28) is arranged in the course of the nozzle channel or extrusion gap. Preferred features: There is at least one thickness measurement sensor in each nozzle channel or extrusion gap (12, 14) in a multiple nozzle. The inner nozzle channel (14) includes a thickness measurement sensor. There is more than one such sensor over the circumference of the nozzle channel or gap; three or four are used. The sensor, especially an ultrasonic sensor, is cooled. The extrusion nozzle includes a cooling mandrel (30), on which the sensor is arranged. There are cooling lines to and from the thickness measurement unit. The extruder with this nozzle is claimed explicitly.