Agitating – Rubber or heavy plastic working – With specified vent means
Reexamination Certificate
2008-03-27
2009-10-27
Cooley, Charles E (Department: 1797)
Agitating
Rubber or heavy plastic working
With specified vent means
C366S085000, C425S203000
Reexamination Certificate
active
07607817
ABSTRACT:
An extruder with a housing comprising parallel, partially inter-engaging bores and screws disposed therein is used when applying a method of feeding powdery bulk materials into such an extruder. A solid transport of powdery bulk material takes place in an inlet zone disposed downstream of a feed opening wherein said inlet zone is partially filled. The inlet zone is provided with at least one gas-permeable wall portion wherein a layer of bulk material is created on said wall portion, thereby preventing bulk material from passing through, The gas-permeable wall portion is connected to a vacuum source and to a pressure gas source. Furthermore, the gas-permeable wall portion has an inner wall which is set back with respect to the wall of the bores, thereby forming a gap with a partially annular cross section wherein a layer of the bulk material is formed in the gap.
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Heidemeyer Peter
Sämann Hans-Joachim
Strecker Jürgen
Welb Sören
Wiedmann Werner
Conte James B.
Cooley Charles E
Coperion GmbH
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