After the melt has been plasticated in the barrel, the injection time is the time it takes the screw to move from the injection start position to the transfer position. At the transfer position (commonly referred to as the VP (Velocity-Pressure) position , the screw movement is transferred from velocity to pressure control . This is normally considered the cavity fill time. However the processor has the ability to switch from velocity to pressure control at any time prior to cavity fill. It is common practice that VP switchover occurs when the cavity is about 95% full.
“Of all the training seminars that I have attended over the past 10 years, this one ranks at the top! The explanations of clamp tonnage, cooling strategies, viscosity, and key mold design components are just a few of the takeaways that will be very useful in my job function.”
Russ Wolff, Business Development Manager
“I was amazed at the amount of expertise and knowledge presented in just two days. Many myths were debunked, numerous scientific explanations for the way we should be thinking about plastic flow were given, and various real-world examples were used to show how plastic flows.”
Don Makowski, Design Engineer