The specifics of vacuum pump needs vary depending on what kind of application they are being used in. Packaging requires low pressure with a faster cycle. Processing, such as tumbling or mixing, has a longer cycle time with higher pressure than packaging, but it's more of a medium pressure requirement than a high one. In freeze-drying, the cycle times vary, but the pressure requirements are lower than either of the other two applications mentioned here.
"If you look at each application individually, the differences in pump requirements become pretty significant," says Jim Hupp, Product Sales Development Manager, Leybold. He explains the applications of dry vacuum pumps in each of those three specific areas.