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New hot runner mold technology yields greater processing latitude

Technology in hot runner systems is in big demand, and it continues to evolve to help mold manufacturers design and build molds that cycle faster, have smaller footprints and help reduce cost to manufacture.

Clare Goldsberry

June 12, 2013

2 Min Read
New hot runner mold technology yields greater processing latitude

   
Husky Injection Molding Systems (www.husky.co) introduced its Pronto manifold system that is easier to configure, provides faster delivery, offers improved thermal consistency and is guaranteed leak-proof. Since the manifold is the heart of any hot runner system, the configurable options with the Pronto offers a diverse and broad range of applications.
   
The next generation Pronto manifold systems come standard with application review, optimized melt channels for every application, wide processing windows, and simple assembly. Pronto also has optimized melt channels for every application.
   
Technoject Machinery Corp. is now offering a new valve gate hot runner system with miniature space requirements, developed by Heitec Hot Runner Systems GmbH of Burgwald, Germany. Technoject (www.technoject.com) is the North American distributor for Heitec.
   
Based on the already existing Flat-Line Nozzle platform 61.041, the new nozzle design achieves a minimum nozzle spacing of less than 6 mm. With this design a complete valve gate system with, for example 4, 8, 16 or more nozzles, can be arranged in a very small mold base sizes resulting in lower mold costs, higher productivity, more design flexibility and less melt residence time.
   
This reduced valve gate spacing is suitable for many industry segments including medical applications such as vial strips, cuvettes, and electronics applications such as reel-to-reel overmolds.
   
Each valve gate nozzle is equipped with its own 230V heater and thermocouple allowing separate temperature control for fine tuning, enabling a balanced fill pattern among the cavities, said Technoject.
   
Last month, Paul Boettger, president of Technoject, spoke at the Injection Molding Conference 2013 at the Jack Burke Research and Economic Development Center at Penn State Behrend, in Erie, PA. His presentation, "New Advancements in Applying Hot Runner Technologies Effectively to Challenging Medical Molding Applications," addressed the “production of small-size engineered plastic parts for the medical industry that requires quality and process reliability as well as high output rates.”
   
Boettger noted that this “calls for hot runner technologies with individually controlled nozzles for close cavity spacing, systems with direct edge gating, and cleanroom suitable actuations for valve gate systems.”

Miniaturization of many medical parts also presents challenges that the miniaturization of hot runner nozzles can address. “Miniaturization of hot runner nozzles is opening up new ways to cost effectively ramp up to higher cavitation without increasing mold sizes and cavity spacing, which is a critical factor for thermally sensitive resins,” said Boettger. “New nozzle designs as well as thermal management and new activation methods can help overcome these challenges, and are valuable for any medical molder looking to utilize hot runner technologies in new and more productive ways.”

About the Author(s)

Clare Goldsberry

Until she retired in September 2021, Clare Goldsberry reported on the plastics industry for more than 30 years. In addition to the 10,000+ articles she has written, by her own estimation, she is the author of several books, including The Business of Injection Molding: How to succeed as a custom molder and Purchasing Injection Molds: A buyers guide. Goldsberry is a member of the Plastics Pioneers Association. She reflected on her long career in "Time to Say Good-Bye."

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