PT ZONE: Multi-Screw Compounding

Compounding: Modular System Can Now Be Shipped Faster
Krauss-Maffei Berstorff redesigns its ModulPlus line of twin-screw extruders to shorten delivery-lead times and reduce cost. More (+)
Compounding PLA on Twin-Screws: What Testing Reveals
Twin-screw extrusion is the preferred method for compounding PLA and other biopolymers. But processing PLA is complicated because it’s sensitive to heat and shear. It’s also prone to hydrolytic degradation if moisture is present in molten PLA. Here’s what one machine builder’s trials revealed. More (+)


MOST RECENT CONTENT: Multi-Screw Compounding

COMPOUNDING: Quick-Change Cutting Chamber Slices Downtime

New quick-change cutting chamber for strand pelletizer said to deliver easy and quick removal of the cutting chamber with minimum downtime.

COMPOUNDING: Process Pelletizes and Crystallizes

Process avoids the need to cool PET after pelletizing and then reheat it for crystallization

Compounding: Strand Pelletizer for Long-Fiber Compounds

High-speed series is also easy to clean and adjust.

Extrusion/Compounding at K 2013: Having It All

Extrusion processors no longer need to chose among speed, quality, and flexibility, based on exhibits at K 2013.

COMPOUNDING: Higher-Torque Twin-Screw

The TEX 44 Alpha III corotating twin-screw extruder from JSW will debut at next month’s K 2013 Show in Düsseldorf.

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OVERVIEW:
Multi-Screw Compounding

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Most materials today are compounded on multi- (usually twin-) screw compounding extruders. Most of these machines feature co-rotating, intermeshing screws, though there are applications in which counter-rotating, intermeshing or non-intermeshing machines are used. Extruders with more than two screws have been developed for applications requiring more intense devolatilization and reactive processing.


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