Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1978-11-24
1980-09-23
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264563, 264310, 425192R, 4253261, 425376A, 425380, 425467, B29F 304
Patent
active
042242720
ABSTRACT:
A nozzle assembly has an upstream part which transforms a solid thermoplastic-resin strand into an upstream tube section which is centered on an axis and flows axially. Formations inside this upstream part impart rotation about the axis to at least a portion of the material of the upstream tube section. This upstream tube section is then deflected by a distributor radially outwardly and then forced through a plurality of generally angularly equispaced radially extending throttle passages in a throttle ring. The individual solid streams issuing from this throttle ring are united into a downstream tube section that is passed axially through a downstream nozzle part which is also provided with formations that impart rotation about the axis to at least a portion of the material of the downstream tube section. Eventually the tube issues from the downstream end of the downstream nozzle part as a large-diameter tube suitable for blow molding.
REFERENCES:
patent: 3193879 (1965-07-01), Corbett
patent: 3212134 (1965-10-01), Yokana
patent: 3491406 (1970-01-01), Davidson
patent: 3689192 (1972-09-01), Upmeir
patent: 3756758 (1973-09-01), Prall
patent: 3769397 (1973-10-01), Cook et al.
patent: 3809515 (1974-05-01), Farrell
Reifenhauser KG
Ross Karl F.
Thurlow Jeffery R.
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