screws
Try a ‘Complete’ Method to Clean Screws, Barrels
Pulling the screw will give you direct access to clean all surfaces. Here’s how to do so in an efficient, safe, and non-destructive way.
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EXTRUSION: Venerable Maddock Mixer Still an Extrusion Workhorse
Variations to this decades-old mixing section are widely used, but processors should carefully analyze these designs and not assume they will perform better.
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Novel Coating Dramatically Extends Life of CPVC Screws
Molding parts of CPVC require Hayward Industries to re-coat its screws every 12 months. Now, thanks to a unique screw coating, it’s at eight years and counting.
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EXTRUSION: The Two Main Causes of Screw Wear
Wedging and misalignment are often confused with each other when inspecting a worn screw.
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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.
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Keep Extruder Barrels Aligned…And Production on Target
A misaligned barrel causes a lot of trouble. Laser alignment is being used now to keep things on the straight and narrow.
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A Very Small World: Micromolding at Makuta
Makuta Technics sweats the tiny details so it can run ‘lights out’ most of the day.
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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.
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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.
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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
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