Exploring the: Know How - Extrusion Zone
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- The Truth About Barrel Heating
- The main purposes of the heaters are to melt the polymer that remains in the barrel at cold startup, to assist in forming the initial melt, and to “trim” the barrel temperatures for specific purposes such as improving feed rate.
Columns Published: 8/23/2011
- 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.
Columns Published: 7/27/2011
- Dead Screw Talking
- There's a lot you can learn by conducting a post-mortum examination of your screw.
Columns Published: 6/27/2011
- 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.
Columns Published: 5/31/2011
- 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.
Columns Published: 4/25/2011
- Solving Feed-Related Surging
- Understanding the causes of surging can help troubleshoot and correct it.
Columns Published: 3/26/2011
- 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.
Columns Published: 1/28/2011
- Extrusion: Don’t Forget Zone ‘Zero’
- Have you ever heard of zone zero?
Columns 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.
Columns Published: 1/4/2011
- 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.
Columns Published: 1/3/2011
