Venting in Action
A dynamic (versus static) mold-venting valve helps resolve the most common effects of poor cavity venting.
A dynamic (versus static) mold-venting valve helps resolve the most common effects of poor cavity venting. Its design is based on a simple mechanical system allowing the gas to escape from a venting hole that automatically closes under the pressure of the plastic flow front. It can be placed inside the cavity where the filling pattern produces gas traps. The venting hole isn't affected by mold deposits, thanks to the high venting capacity counter pressure of the air inside the cavity is dramatically reduced.
While EDM speeds today are impressive, there are a number of machining variables that influence the machining speed of the wire EDM.
Alternative venting valves can help overcome standard mold venting limitations and improve mold performance.
While both hot runner and cold runner systems have their benefits, for design flexibility as well as reduced cycle times and costs, hot runner systems will probably be the better choice.