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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.
#bestpractices #sustainability

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.  
#processingtips

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.

The Three Causes of Screw Wear

You run the risk of wasting time and money by not understanding what’s causing your screws to wear.

Tracing the History of Polymeric Materials: Part 1

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

Recycling: Expanding 'Circularity' through Advanced Recycling Technologies

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.

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: 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.

Tooling: The Lowdown on Guided Ejection Systems

  When, where, how and why to use them.  
#bestpractices

Try This Approach to Clean Up Your Recycled Material

CO2 can be used as a totally “green” solvent to remove many kinds of contamination in recycled plastics without the need for toxic solvents.
#editorial

Materials: Annealing Tips for Polyamide-imide, Part 7 of 7

PAI is a material capable of achieving levels of performance that even semi-crystalline engineering polymers like PEEK, PPS, and PPA cannot. But you have to be willing to work for that performance, and the annealing process is an essential part of this. 

Extrusion: Solving Surging in Two-Stage Screws

This usually crops up when the two stages are not matched in output. The best solution is to install a pressure-adjusting valve at the discharge end of the extruder.

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. 

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 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.
#bestpractices #tpe

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

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

Extrusion: Evaluating Screw Design for Multi-Material Recycling

Since many plastic products are made of a combination of materials with very different melting points, careful consideration must be given to designing screws when it comes time to recycle these products.

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.

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.

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?