Know How - Extrusion

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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: 10/23/2014

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.

Published: 7/28/2014

EXTRUSION: Processing Rigid PVC? Know Your Rheology
Before choosing and sizing extruders for running rigid vinyl, it is wise to bone up on the viscosity behavior of the material.

Published: 6/19/2014

EXTRUSION: When Internal Screw Cooling Makes Sense
Internal screw cooling could help you solve solids-feeding and burning problems.

Published: 5/21/2014

EXTRUSION: What’s the Right Feed Throat Temperature?
Selecting the proper one is critical to the process.

Published: 4/23/2014

EXTRUSION: Effect of the Screw Flight On Melt Temperature, Energy Use
So-called rules of thumb regarding the design of flight clearance and width do not consider the temperature effect, both from the point of view of melt temperature and energy efficiency.

Published: 3/21/2014

A Better Way to Balance Die Flow
Use temperature adjustments before making any mechanical tweaks.