Exploring the: Know How - Extrusion Zone



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EXTRUSION: Barrier Screws and Mixers
For some reason, there are a lot of barrier screws in operation with high-shear mixers, when a distributive mixer is usually a better choice.
Columns Published: 8/17/2015
EXTRUSION: How to Adjust for Shrinkage and Orientation
Polymers shrink and orient. Sometimes orientation is unbalanced, resulting in misshaped parts. But there are steps beyond tweaking the die that can mitigate these effects.
Columns Published: 7/16/2015
EXTRUSION: Another Technique for Controlling Melt Temperature
Flight widths are almost always designed at 10% of the screw diameter. But they can be optimized to reduce melt temperature and perhaps boost output.
Columns Published: 7/1/2015
EXTRUSION: Cooling: The Critical Function in Extrusion
Figuring out how much cooling your process needs is complicated. But there are ways to approximate.
Columns Published: 5/25/2015
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.
Columns Published: 4/27/2015
Extrusion: What’s the Best Way to Vent?
There are advantages and disadvantages to each, and they must be evaluated before making a decision.
Columns Published: 3/31/2015
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.
Columns Published: 2/22/2015
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
Columns Published: 1/27/2015
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.
Columns Published: 12/29/2014
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.
Columns Published: 11/24/2014

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