Most molders are still running with screw designs that haven’t changed much in 30 years. But they don’t need to.
RJG Germany GmbH opened its new training lab on Jan. 1, 2020, including a classroom that seats up to 20 students and a fully-equipped lab for hands-on experience.
Central Community College (CCC) to embed RJG education into curriculum when new training lab is completed in the beginning of 2020.
In injection molding, a seemingly minor change in a setpoint can have a significant impact on part quality and process robustness and repeatability. That’s why Scientific Molding focuses on process outputs, not setpoints.
Taking time to sweat the details of clamping is not much fun, but they do make a difference in a company’s bottom line.
Understanding the concepts of pack and hold and applying them during process development is critical for molders to achieve consistent part quality.
It’s free. It’s online. It’s scheduled every Thursday through December. And you can register now to hear technology experts address a wide range of topics in plastics processing.
Editorial Director, Plastics Technology
Fifty expert speakers at Plastics Technology’s annual Molding Conference will offer their insights to help you optimize your process.
To make identical parts, you need to keep fill time constant. Here’s why.
The locking-ring style appears to dominate the market, as most believe it makes a make a better seal and leaks less. But is this really so?
Scientific molding is centered around learning about key molding principles and theories. The strategic application of those principles and theories is what’s known as systematic molding.
A case can be made for multiple variables—fill balance, fill time, injection pressure, cavity pressure—as most important. But there is something else altogether that is essential to successful injection molding.
Each contributes to molded-part quality, and each must be optimized before production begins.
Benchmark your injection molding operation by being a part of our annual survey. Learn more about “best-in-class” practices that separate the tops shops from the rest.
Editorial Director, Plastics Technology
Most parts should be 90-99% full after first-stage—by volume not weight. Here’s why that’s important and how to make a first-stage-only part.
Certain materials don’t play well together when mixed. So it’s best not to. Here are some guidelines.
Use a machine/mold setup sheet to document plastic parameters and use them on any acceptable machine into which the mold is placed.
Simulation not only predicts how a mold will fill, but also provides guidance to make it fill better. The new technology of Autonomous Optimization automatically performs hundreds or thousands of simulations, testing multiple variables—gating, venting and cooling, for example—and learning which combinations help achieve objectives for injection pressure, cycle time, warpage, etc.
Process capability is related to the variation in part dimensions from shot to shot. High values of process capability require the shrinkage of the material to be identical on each shot, which can be confirmed from the pressure-volume-temperature (PVT) graph.
Global medical molder Nypro provides first-hand guidance on what you need to get into the medical molding business.
Are you sure your press is doing what you want? Visit your controller often to ensure your machines plot the pressure vs. time graph for all your processes. Here let’s focus on pack and hold.
Toss the formulas. The best way to determine residence time is to conduct a simple experiment.
Raising backpressure results in increasing shot size, which can cause a host of other problems.
A new injection molding process ‘breaks all the rules’ by using low, constant pressure to achieve faster cycles and better-quality parts.
Start by picking a target melt temperature, and double-check data sheets for the resin supplier’s recommendations. Now for the rest...
Understanding the differences in how each melts is crucial to obtaining melt uniformity.
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