Injection Molding: Controlled Production Shutdown For PET Preform Molding
Netstal machine uses stored braking energy to maintain power during brief outages and allow controlled shutdown without short shots.
In harsh industrial environments, even brief power failures or fluctuations in the grid lasting milliseconds can interrupt the molding cycle, which cannot always be restarted immediately because of the potential presence of short shots in one or more cavities. In PET preform molds with many cavities, removal of short shots can be laborious and carries the risk of damage to the mold.
Consequently, Netstal (U.S. office in Florence, Ky.) is offering a new option for its PET-Line preform molding systems. Called CPP, for Controlled Production shutdown during a Power outage, it will provide enough power to complete the current cycle. (This power comes from braking energy recovered by the drive system.) And if the outage lasts longer, then sufficient power is provided to reliably and controllable shut down the process.
After the previous shot is fully injected and demolded, metering of the next shot is stopped and the entire system is brought to a halt. All axes are returned to their end position. As soon as the power returns, production can be started up again.
Related Content
-
Reversing Logistics for Plastic Film Recycling
Learn how Mainetti built a circular supply chain for clear film packaging.
-
Formulating LLDPE/LDPE Blends For Abuse–Resistant Blown Film
A new study shows how the type and amount of LDPE in blends with LLDPE affect the processing and strength/toughness properties of blown film. Data are shown for both LDPE-rich and LLDPE-rich blends.
-
Best Methods of Molding Undercuts
Producing plastics parts with undercuts presents distinct challenges for molders.
