Know-How
The Mystery Of Physical Aging, Part 3: Accelerated Aging Tests
Accelerated aging tests relied on by industries such as medical take into account only chemical aging—oxidation—and ignore physical aging.
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The Importance of Gate Geometry
Gate size and shape—unlike gate location—don’t often get the attention they deserve. Many common assumptions about gate geometry deserve to be challenged
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How to Address Uneven Wall Thickness in Stretch-Blow Molding
Many conditions must be met to get the best wall distribution in a PET bottle. Skilled operators are, as always, indispensable.
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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.
Read MoreThe Mystery of Physical Aging, Part 2: Slow Down Aging
Dimensional and property changes depend on the size of the part, molecular weight of the resin, and processing conditions.
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New Extrusion Equipment Combines U.S. Management with Chinese Production
Starting up in 2011, Uway Extrusion has begun its commercial push this year, with plans to exhibit at NPE2015 next March.
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Automa Acquired Out of Liquidation By Fellow Italian Firm
The Italian manufacturer of blow molding machinery has been acquired by a fellow Italian company, which services, rebuilds and sells used blow molding machines.
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TOOLING: Flash-Free Molding: Part Two
Parting-line maintenance, mold spotting, and machine conditions can all contribute to flash.
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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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