Valve Gate Products for Technical Applications

Oerlikon HRSflow has developed new external valve gate end rings for the Tp and Vp nozzle series. Also new is the company’s Through The Cavity (TTC) end ring for Tp nozzles. What they have in common is their increased wear resistance for processing reinforced thermoplastics and the possibility of restarting at comparatively low temperatures.

Processors who manufacture technical components such as gears and structural parts for the automotive, electronics, household appliances and other industries will benefit in particular from these new additions to the Multiflow HRS portfolio. 

Thanks to the increased wear and corrosion resistance of the new end rings, these can withstand the processing of materials such as PA6/PA66, PBT, POM, PPA and PPS, which are filled with carbon or glass fibers to increase their mechanical properties. These abrasive reinforcing materials would lead to premature wear of conventional end rings. In contrast, the new solutions designed for the Meltiflow HRS line offer a more durable alternative and an extended service life for the hot runner components thanks to the choice of particularly resistant materials.

Due to the robust design of the new external end rings for Oerlikon HRSflow's Tp/Vp nozzle series, significantly lower melt temperatures are sufficient to restart processes after shutdowns or interruptions. This reduces the risk of thermal degradation of temperature-sensitive materials, including the release of corrosive gases when processing flame-retardant materials. The smaller injection point due to the reduced diameter of these end rings also provides greater flexibility and precision during the injection process for uniform filling of the cavities, ideal for applications that require good mechanical properties combined with high optical quality at the injection point.

The special geometry of the new TTC end ring for the Tp nozzle series also ensures a wide processing window and a uniform temperature near the gate for a good restart at low temperatures to prevent material degradation. The 4 mm reduction in bushing diameter increases flexibility in positioning the injection point and simplifies production and maintenance. The result is shorter set-up times and lower labor costs while increasing overall productivity.