PT Blog

The key to understanding warpage with injection molded parts is understanding why plastic materials shrink in the first place. To do that, we need to start at the molecular level with a close look at what happens when plastics melt and cool.

For the most part, the melting and cooling characteristics depend on the type of polymer and whether any filler or fiber reinforcement is present.

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Carbon, which describes its business as sitting at the intersection of hardware, software and molecular science, will be leading a workshop immediately prior to Molding 2019 (March 19-21; Hyatt Regency Indianapolis) that will help attendees reimagine parts and the subassemblies and final products they create.

Taking place on March 18, the free workshop, which has limited openings and will be filled on a first-come first-serve basis by Molding 2019 registrants, is sponsored and presented by Carbon. Leading the event will be Carbon’s Production Development Engineer, Jason Lopes, who will kick things off with a presentation:

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Within the last five years, I have blogged about two university teams—Harvard University’s Wyss Institute and the U.K.’s University of Nottingham—that have been working on the production of chitosan, a man-made bioplastic derived from the organic compound chitin, which is extracted from the shells of crustaceans like shrimp and lobster. Now, a team from Montreal’s McGill University has joined the ‘club’.

According to Audrey Moore, an associate professor of chemistry at McGill, it has been typically difficult to make chitosan durable or in mass quantities. This team’s ‘breakthrough’ patented process, however, involves making chitosan with a longer molecular chains, which makes it more robust.

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An alternative to traditional steel beer kegs said to address two disadvantages—safety and cost—has been developed by Cyprus’ CYPET Technologies. Called the Zeg, this is an ultra-light, 100% recyclable one-way PET keg, which has been built using CYPET’s patented injection stretch blow molding process that reportedly has been proven to be able to produce some of the industry’s most innovative and stunning PET containers.

The patent-pending Zeg features a top chime and handles that are integrated with the rest of the keg body. Having the top chime, handles and keg body formed as one piece is said to significantly reduce the keg’s production cost, as it eliminates fabrication of a separate top chime and its subsequent assembly into the keg. Moreover, the strong mechanical properties of PET allow for the top chime to be lighter in weight than conventional chimes yet still be able to handle the loads that the Zeg will face through its life cycle.

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Sponsored Content 24. January 2019

Molded-In Threaded Inserts: The Basics

Molded-in threaded inserts can be a great option for plastics processors looking for reusable threads in thermoset or thermoplastic applications.

When strength requirements are a top priority, molded-in applications offer the best pull-out (resistance to the insert pulling out of the part) and torque performance (resistance to the insert twisting in the part when the mating fastener is torqued) for metal threaded inserts.

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