Günther is to present its full portfolio of cold runners for silicone and LSR processing at the upcoming K 2019 fair.
The K Show, the world’s largest polymer trade fair, will be held 16-23 October at Messe Dusseldorf.
Günther, based in Frankenberg, Germany (and with UK offices in Kent), is already known for its hot runner technology. But the company has a further 20 years of experience in the cold runner market.
LSR is a particularly difficult material to work with. Made from two components, the mixture has an extremely low viscosity as it is injected into the hot mould.
Hans-Peter Resler, technical advisor LIM at Enbi Plastics in the Netherlands, said: “LSR flows like water. The tools must therefore be very accurate and built absolutely tight to avoid burrs.”
This is critical for production, as the markets using the materials, such as medical and automotive, have very low error tolerance thresholds.
“Günther has a great deal of experience with hot and cold runners,” continued Resler. “How to control temperatures and shear, and thus vulcanisation.”
The company’s cold runner systems support improved cycle times, excellent finished part quality and significant material savings.
The cold runner nozzles exhibit good thermal separation from the hot cavity plate, reducing heat transfer and preventing premature crosslinking – all nozzle heads are equipped with an insulation disc to ensure optimal thermal separation.
Additionally, the nozzle shaft includes a sealing ring to protect against material leaks.
The Günther portfolio includes the 5NEW80 single cold runner valve gate nozzle, the 5DEW80 single cold runner nozzle, the NTKW and NMW cold runner nozzles. There is also the SMA 10 stepper motor for applications with up to four different needle positions per cycle.
To find out more about Günther hot and cold runner systems, visit the company in Hall 1, stand C44 at K 2019.