.jpg;maxWidth=250;quality=70;format=webp)
Jim Frankland President
Extrusion: Barrier Screws: Metering Section or Not?
A barrier screw without a metering section can reduce output and increase melt temperature.
Read More
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.
Read More
Extrusion: Understanding Weld Failures
Hard-surfacing failures without evidence of burrs indicate possible weld bond issues.
Read More
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.
Read More
Extrusion: The Challenges of Extruding Highly Filled Polymers
These materials require screw changes and modifications in upstream and downstream equipment and operating procedures.
Read More
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.
Read More
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.
Read More
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.
Read More
Extrusion Cooling: It’s All About Turbulence
Regardless of what you are extruding, in order to maximize cooling you need to generate turbulence at the heat-exchange surface.
Read More
Sharper Dies Make for Smoother Extrusions
Dies that have a radius at the exit will result in poorer surface finish.
Read More
Sizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.
Read More
How ‘Hydro Wedges’ Reduce Screw Wear
Using them only in the melting section provides for greater design freedom and negates the impact these devices can have on output and melt temperature.
Read More
