| 摘要 |
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 (d<SUB>3</SUB>) smaller than the crest diameter (d<SUB>1</SUB>) 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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