Know How - Extrusion

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Published: 7/27/2011

Where Does Shear Heating Occur? Here’s How to Find Out
One of the least understood yet most important concepts is viscous dissipation, which is the shearing or stretching of the polymer between the rotating screw and stationary barrel, causing heat to develop in the material.

Published: 6/27/2011

Dead Screw Talking
There's a lot you can learn by conducting a post-mortum examination of your screw.

Published: 5/31/2011

Screw Surging, Part III: Unfilled Discharge Section
This type of surge happens most frequently with two-stage screws when the second stage has far more capacity than the first stage. It can also happen when a screw is limited in feeding or melting, causing a partially filled metering section.

Published: 4/25/2011

Overfeeding Can Cause Surges, Too
Surging can be caused by feed restrictions, as covered in another column, and also by over-feeding or under-melting, discussed here.

Published: 3/26/2011

Solving Feed-Related Surging
Understanding the causes of surging can help troubleshoot and correct it.

Published: 1/28/2011

Extrusion: A Roll Is a Roll Is a Roll?
Chill rolls may looks simple and shiny, but they play a critical part in cooling and polishing film and sheet and are not all the same.

Published: 1/4/2011

Extrusion: Don’t Forget Zone ‘Zero’
Have you ever heard of zone zero?

Published: 1/4/2011

Extrusion: Reducing Energy, Part II: ‘Adiabatic’ Extrusion
The term adiabatic extrusion was very popular in the ’60s and ’70s, but has seemingly disappeared from the processing terminology of today.

Published: 1/3/2011

Extrusion: Run Your Chevy Volt with Extruder Energy Savings—Part I
The electricity saved on a large extrusion line could power a number of Chevrolet Volts.

Published: 12/25/2010

Extrusion: Start Up and Shut Down Properly
A key goal during startup and shutdown of the extruder is to prevent degradation of the polymer left in the extruder and downstream components such as screen changers, adapters, and dies.