First, remember there is no universal cooling-roll stack. And be sure to take into account the specific heat of the polymer you are processing.
Follow these guidelines to prevent premature wear, flash and galling.
In many part designs, flow fronts will inevitably be split, but how and where they come back together is hugely important to the molded part’s finished strength.
How—and when—cellulose-based chemistry led to the discovery of cellophane.
Follow these detailed tips to get you the jobs you want. Here we factor in the costs of scrap and regrind, along with energy and certain additives.
How the ‘Big 4’ commodity materials came to be.
Creating and maintaining a consistent cushion is a key step in achieving shot-to-shot consistency. Learn what cushion is and how it affects part quality.
There are still companies that compound glass fibers on single screws. The process is considered an “art,” but can be made more predictable with attention to screw design, speed and length, as well the choice of mixer.
This fourth and final installment focuses on labor, packaging, secondary operations and various assorted details.
Calculating polymer flow is fairly straightforward when designing a die for a simple round profile, but as the shapes get more complicated these calculations can get extremely challenging. Here’s what you need to consider.
When determining the best ejection option for a tool, molders must consider the ejector’s surface area, location and style.
In this installment we discuss the discovery of Bakelite, the first truly synthetic polymer, known today as phenolic.
Molders looking to both monitor an injection molding process effectively and manage production can definitely do both with tools available today, but the question is how best to tackle these twin challenges.
Follow these detailed tips to get the jobs you want. This installment focuses on the mold and the molding machine.
Most molders are still running with screw designs that haven’t changed much in 30 years. But they don’t need to.
In this series we delve into a discerning look back into the history of our industry and how we all got here.
They are being specified more often for recycling applications to increase flexibility. But there is still no such thing as a GP screw and recyclers need to consider other processing approaches.
Each molecule in the molded product can have a different residence time. This variance is reflected in the Residence-Time Distribution, which you can learn how to determine below.
Follow these detailed tips to get you the jobs you want. This installment focuses on the various raw material aspects of quoting.
You run the risk of wasting time and money by not understanding what’s causing your screws to wear.
In this series we’ll delve into a discerning look back into the history of our industry and how we all got here.
Recycling and achieving circularity for materials is at the core of the plastics industry’s evolving sustainable business model. Advanced technologies will play a big role.
Failing to calculate and accurately account for residence time can compromise material integrity before it’s even injected.