Know-How

Use a Process Assessment to Determine the Benefits of Screw-Design Modification
Film Extrusion

Use a Process Assessment to Determine the Benefits of Screw-Design Modification

This type of analysis analysis will provide the converter with a clear picture of whether changes to the screw could provide economic gains through increased rate, yield, and quality.   

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Latest Know-How Articles

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Polymer Showdown — PPO vs. PA66: May the Best Material Win

Second in a series, an expert from plastics engineering consultancy The Madison Group pits leading thermoplastics against each other to see how they differ in processing characteristics, chemical resistance, thermal and mechanical performance, and more.

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best practices

Screw Bounce — What Causes It and Why You Should Care

There are a lot of theories about screw bounce in injection molding it, but what’s the actual cause? Through a series of experiments, and some good old-fashioned math, the author found out.

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Moving Beyond the Relative Viscosity Curve — Determining Optimum Plastic Flow Rates: Part 1

Should injection molders consider using a range of plastic flow rates, versus the selection of one plastic flow rate from the relative viscosity curve?

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Extrusion

How To Identify Resin Degradation in Single-Screw Extruders

Degradation can occur in many single-screw extrusion operations, and typically occurs due to minor design flaws in the screw. Here is how to track it down.  

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Bulk, Solid and Melt Density: How to Calculate These Values and Why They Matter — Part 2 of 2

Understanding and calculating solid density and melt density will help molders with everything from material and machine selection to determining piece part costs.

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Compounding

Optimizing Melt-Fed Single-Screw Extruders on Compounding Lines

The main problem with melt-fed extruders that are starve-fed is setting the depth of the metering channel. In this scenario, we describe how this problem was solved.  

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Latest Know-How News And Updates

Solving Issues with Gloss

Your problem may be related to tooling, material, processing, or combinations thereof. Here’s how to find the root cause.

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EXTRUSION: Melting 101

Learn the basics on how polymer melts in a single screw. Barrel temperature plays less of a role than you might think.

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Materials

Is It Glass Filled or Glass Reinforced?

Here is how to tell the difference.

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Featured Posts

Polymer Showdown — PC/ABS vs. PC/PBT — May the Best Material Win

First in a series, experts from plastics engineering consultancy The Madison Group will pit leading thermoplastics against each other to see how they differ in processing characteristics, chemical resistance, thermal and mechanical performance, and more.

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Materials

Polymer Science for Those Who Work With Plastics: Molecular Weight — What It Is and Why It Matters

Molecular weight might seem like an abstract concept, but it plays a crucial role in determining the behavior of plastics during processing and in their final applications.

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What You Need to Know About Roll-Cooling Design

Cooling rolls might not look like high-tech machines, but the fact is there is a surprising amount of technology involved in their design, manufacture and use. Here’s what you need to know.    

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To Cushion or Not To Cushion: That Is the Question

Whether or not your process setup includes adding cushion depends on multiple factors, including the part being molded. Learn when and how to effectively apply cushion in your process.

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monitoring

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.

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Tooling Know-How

Best Practices for Engraving Cores and Cavities

Consider depth, font style, artwork size, polarity and location when engraving.

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