Injection unit, machine dedicated for test tubes among new processing technologies

June 2, 2021
Engel, Husky and KraussMaffei are among companies with new technologies that offer benefits for makers of medical parts.

By Bruce Geiselman and Karen Hanna  

KraussMaffei, Engel and Husky are providing a shot in the arm for medical injection molders, with new technologies that respond to evolving production needs and changing requirements involving materials and parts.  

The new developments include machine-monitoring technologies; an injection unit for liquid-silicone-rubber (LSR); a blood-collection-tube manufacturing system; a new system combining hot-runner and injection functions; and a cube mold technology.  

Digitalization is one trend. 

Making their debut earlier this year, KraussMaffei’s smartCube hardware and socialProduction mobile app bring social-media-type interactivity and immediacy to the collection of molding data. In the midst of the pandemic, such features have supported requirements for physical distancing and helped to alleviate labor-availability pressures.  

SmartCube is hardware now standard on all new KraussMaffei injection molding machines, and retrofittable to most older machines. It enables the use of digital products, including socialProduction. Together, they capture, analyze and store data streams right at the machine in real time and provide regular updates to ensure the security of globally distributed devices.  

With smartCube and socialProduction, users have access to metrics that give them insight into how their entire stable of machines is performing. The systems reveal relevant anomalies, identify process trends and evaluate process conditions autonomously. According to KraussMaffei, this provides “constant quality in production and [ensures] the highest possible uptime.”

OEMs also are responding to the challenges of processing certain materials, including liquid-silicone rubber, PET and PET-glycol (PET-G). LSR continues to grow in popularity for medical parts such as membranes and implants, OEM representatives said. 

But, due to its extremely low viscosity, it’s challenging to process.  

In October at its Engel live e-xperience, the company showcased a new LSR injection unit that follows a trend toward ever-smaller shot weights. Created in partnership with Fischlham, Austria-based ACH Solutions, which also supplied a quality-control camera cell and an LSR metering pump, the injection unit delivered shots for precision ophthalmic parts weighing 0.0013 gram each. It ran on an all-electric, tie-bar-less e-motion 50/30 TL IMM.  

“Due to its outstanding properties and very good biocompatibility, LSR is becoming increasingly established for medical applications in general,” said Christoph Lhota, VP of the medical division of Engel Austria GmbH in Schwertberg. 

Within the medical industry, micro technology and LSR loom large.  

“Medical technology is currently the biggest driver for the further development of microtechnology,” Lhota said. “Applications exist, for example, for ophthalmology and increasingly in the field of microfluidics for point-of-care diagnostics.” 

LSR isn’t the only challenging material. 

Husky has set its sights on PET and PET-G with its development of a new blood-collection-tube production system, due out later this year. 

Because the system includes an IMM, hot runner and mold, Husky has been able to optimize all the components as a package for blood-collection-tube production. With it, users can make tubes from PET, rather than the more expensive PET-G.

“This is what we would say is the first integrated injection molding system for a medical application,” said Thomas Bontempi, head of medical business development at Husky. “In the medical space today, you normally find a supplier of hot runners, a supplier of the mold and a supplier of a machine. Customers used to put these pieces together, but this is what we believe is a suboptimal solution because there are always boundaries, and the pain comes at the boundaries.” 

In addition, to help medical molders and molders of other particularly demanding parts, Husky recently introduced its UltraShot injection system, which combines injection with hot-runner functions. The new system brings the injection point as close to the mold cavity as possible, making possible previously unmoldable parts, Bontempi said. For example, parts that used to require assembly can now be molded as a single piece. 

Bruce Geiselman, senior staff reporter

[email protected]

Karen Hanna, senior staff reporter

[email protected]


Engel Machinery Inc., York, Pa., 519-725-8488, 

Husky Injection Molding Systems Ltd., Bolton, Ontario, 905-951-5000,   

Krauss-Maffei Corp., Florence, Ky., 859-283-0200, 

About the Author

Bruce Geiselman | Senior Staff Reporter

Senior Staff Reporter Bruce Geiselman covers extrusion, blow molding, additive manufacturing, automation and end markets including automotive and packaging. He also writes features, including In Other Words and Problem Solved, for Plastics Machinery & Manufacturing, Plastics Recycling and The Journal of Blow Molding. He has extensive experience in daily and magazine journalism.

About the Author

Karen Hanna | Senior Staff Reporter

Senior Staff Reporter Karen Hanna covers injection molding, molds and tooling, processors, workforce and other topics, and writes features including In Other Words and Problem Solved for Plastics Machinery & Manufacturing, Plastics Recycling and The Journal of Blow Molding. She has more than 15 years of experience in daily and magazine journalism.