Extruder having variable mid-barrel restriction and adjacent...

Details Extruder having variable mid-barrel restriction and adjacent... Extruder having variable mid-barrel restriction and adjacent...

2008-01-03

2009-12-22

Cooley, Charles E (Department: 1797)

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

C366S085000, C366S088000, C366S090000, C366S091000

Reexamination Certificate

active

07635217

ABSTRACT:
Improved, high Specific Mechanical Energy extrusion systems (20) are provided including a single or twin extruder (22) and an upstream preconditioner (24). The extruder (22) includes an elongated barrel (26) with at least one elongated, axially flighted, rotatable screw assembly (58) therein. The barrel (26) includes a mid-barrel variable restriction valve assembly (32), and the screw assembly (58) has a disrupting/homogenizing screw section (66) therein upstream of the valve assembly (32). The screw section (66) includes a plurality of alternating pitch screw parts (82-92). Preferably, the barrel (26) also has an atmospheric vent (36) downstream of the valve assembly (32).

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Written Opinion and Search report dated Jul. 29, 2009 in corresponding PCT Application No. PCT/US2008/088329, filed on Dec. 24, 2008.

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