Extruder head with a rotary die and process for lubricating this head

摘要

PCT No. PCT/CH86/00088 Sec. 371 Date Feb. 13, 1987 Sec. 102(e) Date Feb. 13, 1987 PCT Filed Jun. 16, 1986 PCT Pub. No. WO86/07562 PCT Pub. Date Dec. 31, 1986.The present invention relates to an extruder head with a rotary die which requires no ball or roller bearings. A die and a mandrel rod consisting of a cable guide are fixed in a cylindrical axial bore of an intermediate rotary sleeve driven by a driving mechanism. The sleeve has a substantially cylindrical outer surface which slidingly revolves in the axial bore of a distributing cartridge. The gliding surfaces are lubrified by the hot synthetic material. A clamping nut axially maintains the intermediate sleeve and allows the leakage flow of the synthetic material to be controlled. Such an extruder head may be utilized for the fabrication of helicoidal elements of synthetic material, especially helicoidal rods for optical fibers.