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US 4,058,298 AGranted
Screw extruder with an enlarged feed section
AssigneeMidland-Ross Corporation
InventorsJoseph J. Duska, Paul E. McGill
Life of this patent
Estimating the term…
Abstract
Disclosed is a screw extruder having an upstream feed section in which the bore and screw is of substantially larger diameter than that in a downstream melting section. The two screws are structurally separable and may be operably independent of each other. The extruder is constructed for removal of the smaller screw outwardly through the downstream end of the extruder. Various arrangements for driving the two screws are disclosed herein.
Claims10
An extruder comprising:
- a barrel having an upstream feed section of larger screw bore, and a downstream section of smaller screw bore in coaxial alignment with the larger bore, and a relatively short tapered transition section providing a transition bore joining said larger and smaller bore sections;
- a screw assembly comprising a first large-diameter screw occupying said upstream section with the thread thereof to sweep said larger bore and said transition bore;
- and a second smaller diameter screw occupying said downstream section with the thread thereof to sweep said smaller bore, both of said screws having a threaded portion comprising a core and a thread supported thereon, and an axial extension adapting each screw for connection with a drive means;
- said second screw having a shaft portion extending coaxially upstream internally of said first screw in bearing relation therewith to connect and maintain said screws in coaxial relationship;
- and
- drive means connecting with said extensions for rotating both screws.
3 more elements
Dependencies are inferred from the claim text.