Spiral design pipehead

Details Spiral design pipehead Spiral design pipehead

1974-11-01

1976-01-13

Smith, Al Lawrence

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Adjustable shaping orifice or shape imparting insert member

425197, B29D 2300

Patent

active

039321029

ABSTRACT:
A pipehead for an extruder includes a die body and a die pin having a central bore, a plurality of radial ports, and a corresponding plurality of helical grooves with a region of decreasing depth. The helical grooves are located at the blind end of an annular channel having a constricted area and terminating in a die opening. The channel is defined by the die body and the die pin. A breaker plate having a multiplicity of openings may be provided downstream of the grooves to generate a multiplicity of filament-like streams that are subsequently recombined as they pass through the constriction of the annular channel. The diameter of the annular channel generally decreases axially along the head. The pipehead is provided with internal and external heating means for temperature control.

REFERENCES:
patent: 3193879 (1965-07-01), Corbett
patent: 3270371 (1966-09-01), Schiedrum et al.
patent: 3491406 (1970-01-01), Davidson
patent: 3533134 (1970-10-01), Blomqvist
patent: 3689192 (1972-09-01), Upmeier
patent: 3809515 (1974-05-01), Farrell

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