Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1983-05-02
1984-07-31
Coe, Philip R.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366 79, 366305, 366307, B29B 106
Patent
active
044626924
ABSTRACT:
An extrusion apparatus having a barrel and a rotatable threaded screw coaxially positioned therein is disclosed. The apparatus includes an upstream inlet section having an opening therein for receiving material to be processed by the apparatus, a compression section downstream of the inlet section, and a mixing or plasticizing section downstream of the compression section. The interior surface of the barrel is provided with an undercut therein which intercommunicates the feed opening with the compression section and has a portion thereof which extends downstream in the compression section about the interior surface of the barrel with a continuously decreasing cross-sectional area. The undercut may be formed in a cylindrical insert carried within the barrel and, in an alternate embodiment, a second undercut cylindrical insert positioned about the first insert and rotatable relative thereto may be employed to vary the cross-sectional area of the undercut.
REFERENCES:
patent: 2910726 (1959-11-01), Parshall et al.
patent: 3398430 (1968-08-01), Miller
patent: 4075712 (1978-02-01), Geyer
patent: 4171196 (1979-10-01), Maillefer
patent: 4249877 (1981-02-01), Machen
Coe Philip R.
Frenkel C-D Aktiengesellschaft
Posin Jack
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