| 摘要 |
A device for producing a helically wound tube comprises a rotating mandrel around which the tube is wound and an extruding device having an extruder head oriented to direct a continuous strip of plastic through a profile pressure mandrel which defines a calibrating guide channel which in turn is oriented to deposit the desired width of extruded plastic strip onto the mandrel. The guide channel advantageously includes walls defining a cooling passage for a coolant for example on the wall over which the extruded plastic is directed. The extruder and the guide channel are mounted on a carriage so that they may be shifted longitudinally if the axis of the mandrel apply a continuous strip of material thereover at a selected pitch angle. The extruder advantageously includes means for directing a reinforcing rod member into the extruder head so that the extruded strip includes a central tubular reinforcement with a base flange on each side of the reinforcement. |
