Know How - Extrusion

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Published: 4/27/2015

EXTRUSION: Here’s Why You Shouldn’t Run Your Extruders Dry
At least not for longer than a few minutes. The thin film that’s captured between the screw flights and barrel wall supports the screw and acts as a lubricant. Without it, galling can occur.

Published: 3/31/2015

Extrusion: What’s the Best Way to Vent?
There are advantages and disadvantages to each, and they must be evaluated before making a decision.

Published: 2/22/2015

EXTRUSION: Are Grooved-Feed Extruders Right for You?
In specific circumstances, this design can increase output and reduce melt temperature. But grooved feed throats are not for every application.

Published: 1/27/2015

EXTRUSION: Avoid General ‘Pump Ratios’ On Two-Stage Screws
Instead, rely on basic data and calculations to determine the proper depth of the first and second metering sections

Published: 12/29/2014

EXTRUSION: About Your ‘General-Purpose’ Dies
There is no such thing. While dies can be adjusted to provide some flexibility, the fact is they are optimized for one specific output of one particular polymer.

Published: 11/24/2014

Understanding Solids-Bed Breakup in Barrier Screws
Barrier screws all but eliminate problems associated with solids-bed breakup. But if they do occur, tremendous pressures can develop, causing screw wear.

Published: 10/30/2014

New Extrusion Equipment Combines U.S. Management with Chinese Production
Starting up in 2011, Uway Extrusion has begun its commercial push this year, with plans to exhibit at NPE2015 next March.

Published: 10/23/2014

EXTRUSION: Why Bother to Chrome Plate Your Screws?
It doesn’t add that much to the overall cost and can improve performance and facilitate maintenance. So the better question is: Why not?

Published: 9/22/2014

EXTRUSION: Double Flights Are Not a Cure-All
There are certain applications where double-flighted feed sections make sense, and others where they don’t.

Published: 8/25/2014

EXTRUSION: Why Barrier Screws & Rigid PVC Don’t Always Mix
RPVC’s somewhat unusual melting mechanism makes it unsuited to traditional barrier type designs.