Mixing device for extruders

Details Mixing device for extruders Mixing device for extruders

2006-05-02

2006-05-02

Cooley, Charles E. (Department: 1723)

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

Reexamination Certificate

active

07036974

ABSTRACT:
A mixing device comprises a cylindrical body (14) to be terminally engaged with an extrusion screw (2) and carrying at least one primary mixing thread (15) and at least one secondary mixing thread (16) having a crest diameter (d3) smaller than the crest diameter (d1) of the primary mixing thread (15). The primary mixing thread (15) has a helical extension in the same direction as that of the secondary mixing thread (16), to delimit at least one primary flow channel (17) and at least one secondary flow channel (18) that are substantially parallel. The primary mixing thread (15) further has, on its crest (19), communication grooves (20) between the primary (17) and secondary (18) flow channels.

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European Search Report for companion case, No. EP 03 42 5153.
European Examination Report for companion case, No. EP 03 42 5153.

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