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| 13 MINUTE READ

What You Need to Know About Blade Ejectors: Part 2

Follow these guidelines to prevent premature wear, flash and galling.

Understanding Roll Deflection in Sheet Processing

Because of roll deflection, sheet stacks made for PS don’t work nearly as well with PP. One solution is to try a top roll that bends in the opposite direction.

Apply the Power of a Troubleshooting Checklist to Your Process

Pocket guides provide processors an injection molding “crib sheet,” but in a process with thousands of interactions, applying if-this/then-that logic can’t always get you to a problem’s root cause.
#bestpractices

Tracing the History of Polymeric Materials: Part 8

The story of nylon, the first true engineering thermoplastic.

How to Select the Right Cooling Stack for Sheet

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.  

What You Need to Know About Blade Ejectors: Part 1

Follow these guidelines to prevent premature wear, flash and galling.

The Difference Between Knit and Meld Lines--and Why It Matters

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.

Tracing the History of Polymeric Materials: Part 7

How—and when—cellulose-based chemistry led to the discovery of cellophane.  

Tracing the History of Polymeric Materials: Part 6

How the ‘Big 4’ commodity materials came to be.

Consider the Cushion When Seeking Shot-to-Shot Consistency

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.

Put Science into Glass-Fiber Compounding on Single Screws

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.

Get Better at Quoting Injection Molded Parts: Part 4 of 4

This fourth and final installment focuses on labor, packaging, secondary operations and various assorted details.

Extrusion: Follow These Tips to Get Profile Die Design Just Right

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.  
#dies

Three Key Decisions for an Optimal Ejection System

When determining the best ejection option for a tool, molders must consider the ejector’s surface area, location and style.

Tracing the History of Polymeric Materials, Part 4

In this installment we discuss the discovery of Bakelite, the first truly synthetic polymer, known today as phenolic.

Process Monitoring or Production Monitoring—Why Not Both?

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.

Get Better at Quoting Injection Molded Parts: Part 3

Follow these detailed tips to get the jobs you want. This installment focuses on the mold and the molding machine.
#bestpractices

Improve Quality & Productivity With Advanced Screw Design

Most molders are still running with screw designs that haven’t changed much in 30 years. But they don’t need to.  
#scientificmolding #processingtips #screws

Tracing the History of Polymeric Materials, Part 3

In this series we delve into a discerning look back into the history of our industry and how we all got here.   

General-Purpose Screws on the Comeback?

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.

The Importance of Gauging Residence-Time Distribution—Part 2

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.  

Get Better at Quoting Injection Molded Parts: Part 1

Follow these detailed tips to get you the jobs you want. This installment focuses on the various raw material aspects of quoting.