Issue with my double screw extruder
I have an issue with my double screw extruder... When used to process an aggregate materials formulation of less than 30% CP, it will come out fine (I mean - in good shape and floating). But, when I use an aggregate materials formulation of more than 30% CP, it'll come out very poor in shape and will not float.
So, anyone with related issues or solution ideas could you please share?
Mr. Ariyo,
It seems that you are talking about twin-screw extruder. Double screw extruders are extruders with two single screws mounted separately on the equipment. From what you have mentioned, it's not clear what changes in other ingredients do you do when you increase the CP to be >30%.
Floatation of the feed is an effect caused by the expansion starch in the formula. A minimum 20% starch is helpful to provide the pellet with enough expansion to make it float. the pellets float even at 17% starch but then the expansion is lower. So, as a first step, I would suggest that you look at the starch amount in the formulation when you have 30% CP.
Regards
Michael Joseph
Critical Issues in Oil Seed Preparation - Josef Barbi
North American Renderers Association (NARA)
