dies
Novel Rheometer Tells More About Thermoplastic Processing Behavior
A unique type of oscillating-die rheometer, first unveiled in 1999 for analyzing thermosets and composites, has now been upgraded for testing polyolefins and other thermoplastics.
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K 2004 Extrusion: Outputs Rise, Downstream Units Gain Flexibility
The show was packed with new equipment for pipe and profile, including extruders redesigned for higher outputs and/or lower cost, plus new ways to adjust die and calibrator diameters or switch dies and calibrators more quickly.
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Reborn HPM Launches New Injection & Extrusion Machinery
Much has changed in a year for HPM Corp., the 125-year-old Ohio manufacturer of injection, extrusion, and die-casting equipment.
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Automatic Gauge Control: Comparing the Options
Until recently, blown-film processors looking for auto-gauge control had a choice of one segmented-die system, one IBC-based system, and several segmented air rings. Now there are at least nine auto-dies, including two for high-stalk bubbles, and lots of air-ring variations. All claim to improve gauge uniformity, but there are differences.
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Convert PVC Pipe Dies to Make Fence Profiles
If you are a PVC pipe extruder who wants to get into the burgeoning market for fence profiles, you have several new options from American Maplan.
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Cut the 'Chatter' in Window Profile Extrusion
A new class of heat stabilizer and an unusual lubricant are said to allow high-speed extrusion of rigid PVC window profiles without such common problems as "chatter" lines, die plateout, and frictional heat build-up in the calibrator.
Read MoreNPE Newsfinder: Extrusion
NPE will show higher outputs of practically everything, as advances in grooved feeds, servo drives, screw torque, mixing screws, dies, and downstream cooling, cutting, and handling make everything run faster.
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Get Smart About Screens
Almost all extrusion processes pass melt through wire-mesh screens on the way to the die to provide filtering and improved mixing.
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Computer Flow Analysis Helps Develop New Profile Dies Faster
Computational fluid dy namics (CFD), or flow analysis, is routinely applied to dies for cast or blown film.
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How to Fix Vent-Flow Problems
Putting one or two vents between the feed throat and die is a good way to remove moisture, trapped air, and other volatiles from melted plastic as it moves through an extruder.
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