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Injection Molding

PT Tech Days Continue to Inform

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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.

Pipe, Profile & Tubing Extrusion

How to Improve Production of Catheters and Stents

Advances in downstream extrusion equipment have boosted production control.

Sheet 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.

Injection Molding

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.

Automation

'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 Molding

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 Know How

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..

Know How

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

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

Consumer Products

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.

Materials

Materials Part 5: Annealing Tips for Crosslinked Polymers

As with semi-crystalline thermoplastics, annealing can be used in thermosetting polymers to obtain a level of crosslinking that may not be possible within the molding cycle.

Know How

Tooling: Back to Basics on Die Springs Part 1

Some molding shops insist that all of their molds have springs to return the ejector plates. And there are lots from which to choose. Here we’ll focus on compression die springs for injection molds.

Multi-Screw Compounding

Demystifying the Devolatilization Process

Here are some practical guidance and simple tools to help you better understand the process and improve your operation.

Injection Know How

Back to the (Re)Grind

Some amount of scrap—generated in startup, shutdown or defective parts—is inevitable. How can you reclaim regrind into new profitable parts?

Extrusion Know How

Extrusion: 'Melt-Blown' Fiber: What You Need to Know to Enter the Face Mask Market

Coronavirus pandemic has made extrusion processors curious about entering the face-mask market. But melt-blown fiber is very different from most other extrusion processes and requires specialized equipment.

Injection Molding

Tooling: How to Properly Size Gates, Runners and Sprues; Part 5 of 5

Get the sprue, runner and gate sizes close to ideal the first time around.