screws
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.
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High-Pressure Water: A New Concept for Screw Cleaning
Everyone in a molding plant is on the same page for screw cleaning: Avoid pulling it until there is no alternative. Here are ways for dealing with the inevitable, including an altogether new technique.
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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?
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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.
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EXTRUSION: Why Barrier Screws & Rigid PVC Don’t Always Mix
RPVC’s somewhat unusual melting mechanism makes it unsuited to traditional barrier type designs.
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Follow These Tips to Clean Your Blown Film System
Proper purging procedures can avoid the need to shut down the line for cleaning. Here's one expert's advice.
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EXTRUSION: When Internal Screw Cooling Makes Sense
Internal screw cooling could help you solve solids-feeding and burning problems.
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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.
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