processing tips
Injection Molding: No, Backpressure Does NOT Raise Melt Temperature
It’s a classic confusion between cause and effect. Melt temperature rises when screw speed is increased. Check out this data.
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Materials: Cycle Time: Science vs. Rules of Thumb—Part 5
Let’s examine the behavior of semi-crystalline materials that never reach their glass-transition temperature as they cool.
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To Produce Quality Extrusions, Get Control Over Melt Temperature
Temperature zone settings are often misunderstood and improperly adjusted. This often contributes to poor film quality and lower production.
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How to Prevent Stress Whitening in PP Copolymers
A look at causes, detection, and prevention.
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Tooling: Dealing with Sprue Bushings On the Production Floor
Causes of and solutions to some problems you probably deal with every day.
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Cycle Time: Science vs. Rules of Thumb—Part 4
While laboratory tests are helpful in determining how polymers behave, you must remember the fundamental differences between laboratory measurements and the real world of plastic processing. Let’s examine semi-crystalline polymers here.
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How Low Can Low-Rate Feeders Go?
More and more processors are looking for greater precision from their feeding equipment. Here’s what some are doing about it.
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Keep Dust and Angel Hair Out of Your Process
Angel hair, fines, and dust can adversely impact any type of plastics production—from resin manufacturing itself to molding and other processes. Here’s how to solve it.
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Polyolefin Discoloration: New Additive Solutions Solve Common Problems
There’s a growing demand for PE films with lower initial color and improved color stability, as well as better retention of physical properties. New stabilizer systems address these and similar concerns for molded PE and PP parts.
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Materials: Cycle Time: Science vs. Rules of Thumb—Part 2
Understanding cooling—how a given material develops modulus as it solidifies—requires access to data that provides some insight into the relationship between modulus and temperature. Dynamic mechanical analysis is a helpful tool.
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