Know How - Extrusion

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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.

Published: 3/2/2018

Cast vs. Integral: Which Feed Section Is Best for You?
Here are seven factors extrusion processors should weigh to help them decide between cast feed section versus an integral extrusion feed section.

Published: 3/2/2018

Extrusion: Understanding Weld Failures
Hard-surfacing failures without evidence of burrs indicate possible weld bond issues.

Published: 12/1/2017

Extrusion: How Hopper Crammers Can Help Feeding
A crammer can assist the flow of certain polymers into the extruder. But the design is not universal and very material dependent. Here’s what you need to know.

Published: 10/27/2017

Extrusion: The Challenges of Extruding Highly Filled Polymers
These materials require screw changes and modifications in upstream and downstream equipment and operating procedures.

Published: 9/25/2017

Extrusion: The Role of Polymer Density in Screw Design
Density affects the mass flow rate, and energy transfer is based on mass, not volume. As a result, polymer density enters into practically every calculation in a screw design.

Published: 8/31/2017

Extrusion: The Facts About Barrel-Temperature Override
Cooling the barrel more may extract heat from the barrel, but not necessarily from the process. Here’s why.

Published: 7/25/2017

Extrusion: The Importance of Proper Barrel Supports
Supports that allow the barrel to expand and contract easily will prevent alignment issues. Examine them periodically for proper operation, particularly if you’re experiencing excessive wear.