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US 11,230,046 B2Granted
Extruder, masterbatch manufacturing method, and tire manufacturing method
AssigneeToyo Tire Corporation
InventorMakoto Tanaka
Life of this patent
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Abstract
An extruder is disclosed including: a barrel; and a screw provided with a helical groove; wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion; wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream; and wherein clearance reduction ratio at the first portion is greater than clearance reduction ratio at the second portion.
Claims11
An extruder for manufacturing masterbatch comprising:
- a barrel;
- and
- a screw provided with a helical groove;
- wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion;
- wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream;
- wherein a reduction ratio R of the clearance at the first portion is greater than a reduction ratio r of the clearance at the second portion;
- wherein R is given by Formula I;
- wherein the Formula I is
- R=HN/HN+1;
- HN indicates the clearance between the groove and the barrel at an arbitrary Nth turn of the groove in the first portion;
- HN+1 indicates the clearance between the groove and the barrel at an N+1st turn of the groove in the first portion;
- wherein r is given by Formula II;
- wherein the Formula II is
- r=hn/hn+1;
- wherein hn indicates the clearance between the groove and the barrel at an arbitrary nth turn of the groove in the second portion;
- and
- wherein hn+1 indicates the clearance between the groove and the barrel at an n+1st turn of the groove.
14 more elements
Dependencies are inferred from the claim text.