The following is included in this e-tech newsletter:

Leistritz Twin Screw Extrusion Workshop, November 28-29, 2018

Since 1990 5000+ have attended Leistritz educational programs!

Leistritz will host its' annual Twin Screw Extrusion Workshop on Nov. 28-29, 2018 in NJ. As always, classroom sessions are supplemented by "hands-on" twin screw extrusion operating experience. A partial list of topics is as follows:

  • Co-rotating and counterrotating twin screw extrusion technology
  • High speed, energy input (HSEI) twin screw extruder theory and design
  • Comparison to low speed, late fusion (LSLF) designs
  • Screw design and process techniques
  • Techniques for dispersive and/or distributive mixing
  • Sequencing of multi-stage process operations
  • Devolatilization process techniques and practices
  • Scale-up of the twin screw extrusion process
  • Feeder and material handling for pellets, powders and liquids
  • Gear pumps and screen changers
  • Pelletizing: strand cut, water ring, and underwater
  • Direct extrusion for sheet, film, fibers and profiles
  • Reactive processing
  • Process troubleshooting
  • Control and monitoring options
  • Screw assembly and disassembly
  • Twin screw extruder maintenance tips and procedures

"Hands-on" demonstrations at Leistritz NJ process laboratory will include:

In addition to Leistritz staff, the following industry and academia will contribute to the program:

For an example of the interactive screw design and assembly session that will be integrated into the program CLICK HERE.

Dates: November 28-29, 2018

Place: Classroom sessions are held at the Holiday Inn  in Clinton, NJ. Equipment demonstrations are at the Leistritz Process Laboratory. Transportation is provided to/from the demonstrations.

Cost: $800 by Nov 1; $880 thereafter (includes handout materials, lunches, and dinner on day 1)

To register for this program or to receive the detailed agenda, contact May Zaw at 908/685-2333 or e-mail

To download a registration form for the Twin Screw Workshop CLICK HERE.

Leistritz expands NJ laboratory: 3D filament system installed

A recent addition to the Leistritz New Jersey process laboratory includes a ZSE-3D filament system that facilitates the development and production of 3D filaments directly from the twin screw extruder, as well as other tubes and profiles. Direct extrusion of raw materials results in one-less heat and shear history. The ZSE-3D system consists of the following:

  • Co-rotating twin screw extruder configured for compounding, devolatilization and/or REX
  • Loss-in-weight feeders for pellets, powders or fibers · Liquid injection system Gear pump front-end attachment
  • Liquid injection system
  • Gear pump front-end attachement
  • 3D filament die to produce 1 to 5 mm diameter parts
  • Air-rack for air quench cooling or water tank with sizing bushing
  • Downstream system: belt puller, laser gauge and winder or cutter
Close-up of ZSE-3D system die with air quench cooling
ZSE-18 3D system configured for rapid prototyping and sampling

The ZSE-3D twin screw system as configured is ideal for in-line compounding of polymers, with additives and active-fillers, to quickly develop new filaments and formulations. Formulations can be modified "on the fly" for rapid sampling of modified filaments with different formulation percentages. A sample can be produced every 10 minutes.

The ZSE-3D twin screw system in the Leistritz laboratory is rated for 425C operation and is configured for water-soluble and high-temperature engineering polymers.

Other capabilities available in the Leistritz laboratory include:

Featured product: LSE vent stuffer series

The LSE vent stuffer series is a top or side mounted twin screw stuffer that mates with a vented barrel section to push materials back into the process melt stream while venting. This device is particularly useful for high-level devol applications where the associated vent velocities can cause material to fly out of the vent, evolving vent blockage and other adverse results.

Vertical LSE
Barrel and LSE side vent stuffer

Please note:

To download a paper that addresses devolatilization theory CLICK HERE.

Industry events where Leistritz will participate




We are looking forward to meeting you at these events.

Until then, enjoy reading!

Your Leistritz team


To receive more information on anything contained in this newsletter e-mail

Leistritz Extrusion
175 Meister Ave.
Somerville, NJ 08876, USA
ph: 908/685-2333