Extrusion die

Details Extrusion die Extrusion die

1988-06-20

1989-07-11

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

2642091, 2642098, 425380, 4253824, 425466, 425467, B29C 4712

Patent

active

048466581

ABSTRACT:
A flow distributor for use in an extrusion assembly for producing tubing, pipe or blown film from a fluid melt. The distributor is cylindrical with adjacent arcuate channels on both interior and exterior surfaces for respectively forming the inner and outer layers of the extrudate from a fluid melt forced through longitudinal holes into each of the channels. The inner and outer layers are formed in a continuous circular flow so that there is no weld line in each layer; however, when the two layers are merged into a finished extrudate, a single circular weld line is formed at their merged surface and results in a very strong extrudate that resists bursting forces.

REFERENCES:
patent: 2345086 (1944-03-01), Becker et al.
patent: 3069724 (1962-12-01), Schiedrum
patent: 3193879 (1965-07-01), Corbett
patent: 3488669 (1970-01-01), Goodrum et al.
patent: 3756758 (1973-09-01), Prall
patent: 3809515 (1974-05-01), Farrell
patent: 3965931 (1976-06-01), Skobel
patent: 4509907 (1985-04-01), Ratheiser

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