Basically, the purpose of a higher feed temperature in a reverse profile is to ensure the pellets soften enough to stick to the barrel so they convey to the transition zone for melting.

You should conduct a test to ensure what feed zone temperature is best for your material as different heater bands, screws, and barrels behave differently.

There are many times I have found that the same temperature can be used for both the feed and middle temperature zones.

Processing guides can be a great starting point when setting your temperature zones, but do not always reflect the best settings for your machine.

-Andy