processing tips
How to Dry PET for Container Applications
PET is extremely hygroscopic, highly moisture sensitive, and one of the toughest challenges to dry. Here are the basic principles of doing it right for rigid packaging applications
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Why Processors Are Rediscovering Liquid Colorants
In extrusion, injection, and blow molding, liquid color is enjoying something of a renaissance. Cost is one reason, but advances in pigments, carriers, delivery systems, and innovative service programs have played a role too.
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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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Your Options for Mold Venting
When should you use machined vents or porous, sintered metals? Here are some guidelines.
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Optimizing Thin-Gauge Sheet for In-Line Thermoforming
Processing thin-gauge sheet for in-line thermoforming poses unique challenges. Here’s how to cope with them.
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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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