A newly designed twin-screw barrel section promotes a big increase in heat transfer for segmented twin-screw extruders from American Leistritz Extruder Corp. of Somerville, N.J.
The company points out that increased cooling is especially desirable with high screw speeds being used today.
The length of each barrel is four times its diameter, so a 100-millieter twin screw uses a 400-mm-long barrel. Internal cooling bores are arranged close to the barrels' figure eight pattern and the melt stream.
The number of cooling bores for each barrel has been increased to facilitate heat transfer for each section.
Leistritz has boosted the rate of coolant to the barrels to match the improved heat removal. Flow rates can be individually regulated via needle valves to handle different temperature set points along the length of the barrel.
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