Mixing elements having an improved dispersing effect
AssigneeCovestro Deutschland AG
InventorsMichael Bierdel, Thomas König
Life of this patent
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Abstract
The invention relates to mixing elements that have a larger number of basic geometric periods per section and an improved dispersing effect for multi-shaft screw extruders comprising screw shafts that co-rotate in pairs. The invention further relates to the use of the mixing elements in multi-shaft screw extruders, a corresponding screw extruder comprising the mixing elements, and a method for extruding kneadable materials.
Claims18
Mixing elements for multi-shaft screw extruders, wherein the mixing elements comprise screw shafts that co-rotate in pairs, wherein the number of base geometry periods in a longitudinal section of one of the mixing elements that corresponds lengthwise to an outer diameter of the mixing elements is greater than or equal to 5.5, wherein the base geometry of the mixing elements comprises a reverse-conveying feeding element with a single-thread screw Erdmenger profile, wherein the base geometry comprises combs, wherein the combs are provided with active-conveying grooves, and wherein the pitch of the conveying grooves is at least 7 times the outer diameter of the mixing elements.
Dependencies are inferred from the claim text.