On the newer electric injection molding machines, there is typically no detriment to using a slow screw speed for longer cycle times. This will just result in a more uniform and consistent melt.
Question: Your training states that recovery should consume 80% of the cooling time. Some of our cooling times are almost 2 minutes, will this put excessive strain on our new electric machines?
My Response: This actually adds no additional strain on your servo motor. As long as the machine can maintain a consistent recovery time, you should use a slow screw speed when possible. I have seen all-electric molding machines capable of maintaining consistent recovery times with rotational speeds lower than 10 RPM.