Know How - Extrusion

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Published: 4/1/2019

Why Barrel Temperatures Have a Small Effect on Melt Temperature
Extruders are not like ovens. Tweaking barrel-temperature profiles will not influence melt temperature all that much. Here’s why.

Published: 3/12/2019

Simple Scale-Up Calculations for Melting
You can avoid complicated melting equations when designing or evaluating a screw by using simpler methods that can save time and provide good results.

Published: 1/1/2019

Unraveling the Complexity of Single-Screw Scale-Up
Variables such as shear rates, melting rate, residence time and conductive heating are all influenced in the scale-up.

Published: 11/30/2018

Telltale Signs of Screw Wear
Determining the cause of wear is the first step in eliminating it.

Published: 10/1/2018

Extrusion: Head Pressure and Output Stability
Use drag- and pressure-flow equations to analyze fluctuating output.

Published: 8/28/2018

Extrusion: How to Estimate and Control Head Pressure
You rightfully worry about melt temperature, but don’t overlook head pressure, because the two are closely linked and will influence line performance.

Published: 7/1/2018

Extrusion: A Simple Way to Evaluate Your Screw Performance, Part 2
A hand-held calculator and some basic equations can help determine whether your screw is up to snuff.

Published: 6/1/2018

Extrusion: A Simple Way to Evaluate Extruder Screws
While there’s lots of data that influences screw design, processors usually don’t have access to it. So instead, try calculating drag flow to see if your screw is working properly.

Published: 4/27/2018

Extrusion: Barrier Screws: Metering Section or Not?
A barrier screw without a metering section can reduce output and increase melt temperature.

Published: 3/29/2018

Extrusion: Why There Are No Truly Universal Dies
Flow characteristics of different polymers vary considerably. So while adjustment features are available, for the most part dies must be designed for an individual polymer.