Feed throat configuration
Vol.20 #1, Mar., 1993
When selecting an extruder, the shape of the feed throat is very important. Round throats are sufficient for 100% pellet feed, but when 20% or more regrind is added in with the virgin, a rectangular or oblong opening will improve the feeding characteristics.
The elongated opening also helps in eliminating bridging, problems in the throat.
See also
Bridge breaker
Extruder throat cooling
Feed throat temperature
Feed throats