lab compounders | machinery feature
Jennifer Markarianlooks at the latest developments in lab
compounding lines, including small-scale extruders, kneaders and mixers
Big ideas for small machines
Small-size extruders are indispensable tools for researchers in both academic and industrial labs who want to run experiments but minimize the amount of material they use. To meet varying needs, laboratory extruders must be flexible, with the capability to add sections such as side feeders, degassing sections, and liquid feeding. in industrial labs, smaller lines are often chosen so
that they scale to production-sized equipment, and suppliers generally offer small versions of their larger production machines for this purpose. Suppliers agree that the ideal is to have the same geometry and type of machine in the lab that you plan to use for production. Smaller extruders are also being used more and more for the production of very small lots, or specialist applica- tions such as hot-melt extrusion of pharmaceuticals. over the following pages we look at the latest
developments in lab compounders from a wide variety of suppliers.
Testing with twin-screws Leistritz launched its ZSE 18 maxx at last year’s K show and it presented a variety of test results obtained using the new extruder at its compounding workshop, which was held in nuremburg, germany, last month. one of the machines was also demonstrated at the event, producing talc-filled compounds. The 18.5 mm diameter twin-screw extruder has a
www.compoundingworld.com December 2011 | compounDing worlD 21
1.66 oD/iD ratio which results in a larger free volume and simplified scale-up calculations for the company’s larger ZSE maxx machines. in addition, the throughput of volume-restricted formulations can be increased by up to 30%. Depending on the materials being processed, the ZSE 18 maxx is capable of throughputs up to 50 kg/h. Screw lengths range from 24D to 60D, the latter being
a new addition to the range. As with the full-size machines, the barrel length is based on 4D sections, while the shafts’ spline profile has been adapted to create more volume while providing higher torque. The number
Leistritz
demonstrated a ZSE 18 Maxx at its Compound- ing Workshop last month
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