Extrusion die for externally ribbed plastic tubing

Details Extrusion die for externally ribbed plastic tubing Extrusion die for externally ribbed plastic tubing

B - Operations, Transporting

29

C

18/741

B29C 47/20 (2006.01) B29C 47/12 (2006.01) B29C 47/22 (2006.01) B29C 47/28 (2006.01) B29C 47/86 (2006.01)

Patent

CA 1320323

ABSTRACT An extrusion die for externally annularly ribbed seamless plastic tubing has an elongate nozzle within which a hollow mandrel is placed. The nozzle and mandrel define an annular extrusion orifice for extrusion of a parison. The orifice has a coaxial conical portion with its generatrix forming an angle of more than 45° with the longitudinal axis of the nozzle for efficient filling of mold cavities corresponding to annular ribs of the formed tube. The diameter of the inner conical portion at its delivery end may be at least that of the outer portion. 7858b.6

615585

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