Twin-Screw Lab Line Can Test Dispersion

Leistritz in Somerville, N.J., has equipped its three smallest lab models of corotating and counter-rotating twin-screw extruders with a gear pump, screen pack, and software to assess dispersion quality during compound development.

Leistritz in Somerville, N.J., has equipped its three smallest lab models of corotating and counter-rotating twin-screw extruders with a gear pump, screen pack, and software to assess dispersion quality during compound development. On Model ZSE-18, ZSE-27, and ZSE-40 high-speed extruders, Leistritz’s Macromatex TSCS controls can now track pressure build-up on the screen pack and create spreadsheet and graphic reports that provide a relative measure of dispersion quality. (As we reported in July, measuring filtration pressure rise is the basis of the new European DIN-EN Filter-Pressure-Value test for melt dispersibility of masterbatches, but the European test typically uses a single-screw extruder.) This system can also provide extra filtration for low-volume specialty production.