PT Blog

Sponsored Content 14. February 2019

How and Why Injection Molding Shrinkage Occurs

The underlying cause of warpage is deceptively simple: variations in shrinkage. Simply put, if a part shrinks perfectly uniformly in all directions, it becomes smaller but retains the correct shape. If, however, any element of the part shrinks at a different rate than any other element, the difference creates internal stresses. If these stresses exceed the part’s structural integrity, the part will warp when it is ejected from the mold.

In general, there are four shrinkage variations:

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By: Heather Caliendo 13. February 2019

Carbon, Lamborghini Partner on 3D-Printed Auto Parts

On the heels of its recent announcement with Ford, Carbon announced its strategic partnership with Lamborghini, which is using Carbon’s technology to digitally manufacture its first production parts. The two parts are a new textured fuel cap with the Urus label and a clip component for an air duct. Both parts are on Lamborghini’s Super SUV, the Urus model, which was first introduced in 2018.

“Through our extensive procurement research, we found that many of our vehicle components were ideal candidates for digital manufacturing,” says Stefan Gramse, Chief Procurement Officer of Automobili Lamborghini S.p.A. “By partnering with Carbon, we are designing on the means of production, which allows us to produce more durable products smarter, faster, and more efficiently, while also substantially accelerating our time to market. We are looking forward to a sustainable, successful partnership with Carbon.”

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At this year’s MD&M West, Eastman Chemical highlighted both industry collaborations and new developments in materials for both medical devices and their packaging, including work with Clemson University’s Capstone Project and medical technology OEM Mindray.

● Clemson University: As part of its ongoing collaboration with the Packaging Science degree program, Eastman works with co-sponsors Remington Medical, a leading producer of disposable medical devices, and TekPak, an innovative medical thermoformer, to help students develop prototypes of rigid medical packaging for hip implants and to learn critical elements of the validation protocol.

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Just last month, I reported on Finland’s VTT joining Think Beyond Plastics as an R&D partner. In that role, VTT will support the New Plastic Economy Innovation Center’s innovators and entrepreneurs by offering R&D services to accelerate the development of innovations in the area of circular plastics.

In keeping with that theme, VTT researchers just announced a prototype of a newly developed cylindrical extruder that they say promises to revolutionize the processing of recyclable materials and thereby promote circular economy business. The extruder can be used to turn problematic textiles and plastics, as well as food waste, into pellets. The first prototype has already exceeded the industrial steering group’s expectations during initial testing, and VTT is now looking for a partner to commercialize the technology.

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It seems like the problems with vacuum conveying have been around forever. Because resin pellets are pulled through tubing at such high speeds, it damages the material in the process. The friction of rubbing against tubing walls can soften some materials causing angel hair, snake skins and streamers. More brittle materials can shatter, creating dust and fines. Abrasive materials can wear away the insides of the lines, eventually causing leaks.

The good news is that new conveying technology can gently move your materials at comparable output rates without the material damage that causes these common problems.

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