#BESTPRACTICES

Extrusion

Use Rheology and Flow Simulation to Troubleshoot Extrusion Processes

Let’s take the mystery out of rheology by showing how the wealth of information it provides can be used by processors to solve real-world production problems.  

Recycling

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.

November 2020’s Most-Viewed Articles

These articles garnered the most reader attention among stories posted in November 2020 by Plastics Technology: implementing automation, gauging residence time, the history of polymers and more.

Extrusion

Troubleshooting Pressure Fluctuations in Piston-Type Melt Filters

Piston filtration offers many advantages over other systems. While pressure fluctuations could be regarded as their weakness, there are many ways to avoid them, both from the mechanical and the process side. Small adjustment can make a huge difference in the overall performance and efficiency of the system.

Electronics

How to Automate High-Precision ‘Micro’ Insert Molding

What does it take to automate a horizontal injection molding cell to handle micro-sized inserts and molded parts? General-purpose top-entry robots and tooling may not be up to the job.

Injection Molding

How to Plan and Implement Automation in an Injection Molding Plant

There is no “one size fits all” solution in automation. When considering what it would look like in your plant, hone in on the staff, products, space, and goals that are specific to you and the automation system that you will be installing.  

Molds & Tooling

PT Tech Days Continue to Inform

Register now to hear technology experts address a wide range of topics in plastics processing. And access our archives to tune in to what you may have missed. It’s free.

Injection Molding

Residence Time and Residence-Time Distribution—Part 1 of 2

Failing to calculate and accurately account for residence time can compromise material integrity before it’s even injected.

Injection Molding

Injection Molding: Understand the Link Between Feed Throat Temperature & Bridging

Save time and money by properly controlling the feed-throat temperature. In some cases—but not all—it can help you solve a bridging problem.

Pipe, Profile & Tubing Extrusion

When to 'Adapt,' When to Retool?

That is the question pipe and tubing processors typically confront when they specify a line for one product, only to have to add to the product mix when business conditions change. Here are some tips to guide you to the right answer.

Testing

Materials Knowledge Pays Off at Teel Plastics

Well-equipped and well-staffed testing lab elevates competence of custom processor.

Medical

How to Improve Production of Catheters and Stents

Advances in downstream extrusion equipment have boosted production control.

Pipe, Profile & Tubing Extrusion

PART ONE How to Determine Viscosity Data Using a Slit-Die Viscometer

Using a slit-die viscometer connected to a lab extruder can generate accurate data on melt viscosity at various shear rates and temperatures, a useful QC tool in processing.

Molds & Tooling

Tooling: The Lowdown on Guided Ejection Systems

  When, where, how and why to use them.  

Extrusion

Shopping for a Barrel? Consider the Full Cost of Ownership

Beyond just the “invoice price” of a barrel, processors should consider factors like the composition of the inlay, quality of the backing material, straightness, concentricity, machining imperfections and packaging/handling, to understand the true cost of owning a barrel.

Medical

'10 Things We’re Seeing in Machine Shops Right Now'

Metalworking shops and plastics plants make for interesting comparisons of their responses to the COVID-19 challenge.

Injection Know How

How to Know When Your Process is Ready to Make Acceptable Parts

Focus on six key metrics to help you determine when a process is lined out and stable enough to start production. 

Five Ways SPC Can Improve Performance

Statistical process control (SPC) can help plastics processors determine the factors responsible for product quality variation and provide a roadmap for improving the production process.

Extrusion

Understanding the Effect of Polymer Viscosity on Melt Temperature

Every processor should get hold of the viscosity curves for the polymers they use or contemplate using in their operations, and learn how to read them.

Materials Know How

Materials Part 6 of 7: Annealing Tips for Thermoplastic Polyurethanes

TPUs form physical, rather than chemical, crosslinks that can be broken by reheating. Formation of these crosslinks can be sped up by annealing, which improves a variety of properties.

Purging Compounds

Follow These Purging and Preventive Maintenance Tips for Your Screws and Barrels

Processors can extend the life of equipment and improve productivity by coupling a preventive-maintenance program for their screws and barrels with routine use of chemical purging compounds..

Molds & Tooling

Tooling: Back to Basics On Die Springs--Part 2

Follow these steps for proper die-spring selection and installation.

Sheet Extrusion

Clear Your Calendars for Plastics Technology 'Tech Days'

Beginning Oct. 8, we will be bringing exclusive, live, online technical content on a wide range of processing topics that you can access for free.

Multi-Screw Compounding

How and Where Twin-Screw Extruders Fit in Recycling

When utilized in a thoughtful way, the corotating intermeshing twin-screw extruder can transform recycled materials into value-added products and parts. Here’s what you need to know, and some real-world examples of the technology deployed for both post-industrial and post-consumer recycling.

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