Extrusion
Screw Design Is a Matter of Balance
In order to achieve a balance between feeding, melting, and pumping it’s necessary to use proven calculations and/or tested empirical data in the design of each section.
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New Plastic ‘Lumber’ Uses No Wood
Intended to expand the property profile and application potential of polymeric wood substitutes, a new technology is available for license to make lightweight plastic lumber-type products that contain no wood fiber.
Read MoreNew Owners for American Kuhne
The Graham Group, York, Pa., last month announced it had bought controlling interest in American Kuhne (AK), the Ashaway, R.I.-based manufacturer of extruders, screws, and integrated extrusion systems.
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New Device Senses Extrusion Melt Pressure Directly
A new type of melt-pressure sensor from Dynisco Plastics, Franklin, Mass., is said to be the first such device to sense pressure directly, without using mechanical structures or liquid-fill media.
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ISO Poly Avoids Economic Woes With High-Value Films
Positioning itself on the high end of the blown-film market helped insulate this blown film processor from the recent economic downturn.
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Stop Those Drooling Dies
Die drool, or plateout, can cause a host of problems for extrusion processors. Here is how to stop the problem before it starts.
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Understanding Gravimetric Blender Accuracy & Payback
Accuracy is one of the least understood aspects of blending. The differences between batch and continuous blenders, how blend accuracy is calculated and controlled, which blender type is more accurate, how much accuracy is really required, and how payback is calculated are discussed here.
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What Output Should You Expect?
You can get a rough estimate of the potential output if you know the drive horsepower of your machine and the thermal characteristics of one of the materials you’ll be running.
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PBT & PET Polyester: Part 2 The Performance Factor
All things being equal, PET will outperform PBT mechanically and thermally. But the processor must dry the material properly and must understand the importance of mold temperature in achieving a degree of crystallinity that allows the natural advantages of the polymer to be realized.
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‘Light’ Grooves Offer Big Boosts in Film Processing
Blown film is main target for technology billed as an option to smooth bore feedthroats in extrusion.
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