Extrusion
Screw Surging, Part III: Unfilled Discharge Section
This type of surge happens most frequently with two-stage screws when the second stage has far more capacity than the first stage. It can also happen when a screw is limited in feeding or melting, causing a partially filled metering section.
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Look Upstream to Avoid ‘GIGO’ Pitfalls in Extrusion
You may think you have a feeding issue when in reality your problem may be upstream.
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Nano Technology Moving Fast Into Blown, Flat Film
New technology to process nano blown films unveiled by Dow at Antec. Nano cast film, sheet advances too.
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Cyclic Olefin Copolymer Enhances Polyolefin Blends for Film Packaging
Cyclic olefin copolymer (COC ) is an amorphous thermoplastic that is finding increased utility as a blending agent in polyolefin packaging films for medical, consumer, and industrial markets.
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Multi-Layer Injection Molded Tubs Take on Thermoforming & Metal Cans
Kortec Inc., Ipswich, Mass., a supplier of multi-layer injection molding technology, is launching an altogether new system for making rigid barrier containers.
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Microcellular Foam with Heat-Cool Makes Class-A Glossy Parts
A high-gloss surface equivalent to automotive Class-A solid molding can now be achieved with the weight savings and other benefits of microcellular foam molding, thanks to a new licensing agreement between Trexel Inc., Waltham, Mass., and Ono Sangyo Co.
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FDA Gives OK to Novel RPET Extrusion System
German equipment supplier Gneuss (U.S. office in Matthews, N.C.) last month received an unrestricted non-objection letter from the U.S.
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Toray Produces Biax, Metalized PLA Film
Oriented films producer Toray Plastics (America), Inc., N.
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Overfeeding Can Cause Surges, Too
Surging can be caused by feed restrictions, as covered in another column, and also by over-feeding or under-melting, discussed here.
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Extrusion Vet Guthrie Supplies Recycling Equipment
Long-time extrusion industry executive Sandy Guthrie has started his own recycling equipment company.
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