Head for extrusion of a tubular parison formed of at least one l

Details Head for extrusion of a tubular parison formed of at least one l Head for extrusion of a tubular parison formed of at least one l

1982-04-05

1984-09-18

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Centripetal elastic melt extruder type

264541, 425376A, 425465, 425466, 425467, B29F 304

Patent

active

044721293

ABSTRACT:
Improved extrusion head for use in forming plastic containers or tubular films (optionally with multi-ply walls) by the extrusion-blowing process. The typical extrusion head used in this process has flat compensating rings bounding a portion of the frustoconical flow passages which ultimately feed the extrusion orifice. These are replaced by spherical segmental rings having a beveled surface in the form of a spherical, conical, toric or ogival shape which bounds said flow passage and thus eliminates stagnating recesses (of the type encountered through use of the prior art flat rings).

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