Effects of Processing Conditions on Single Screw Extrusion of Feed Ingredients Containing DDGS

Distillers dried grains with solubles (DDGS), a feed coproduct from the gas ethanol market, has been shown to be a viable potential choice protein source for aquaculture feeds. To research this, three isocaloric (3.5kcal/g) component blends containing 20, 30, and 40% DDGS, with a net necessary protein adjusted to 28% (wet basis, wb), were prepared for use as Nile tilapia feed. Extrusion processing was then conducted applying three DDGS contents (20, 30, and 40%, wb), three moisture contents (15, 20, and 25%, wb), three barrel temperature gradients (90-100-100¡ãC, 90-130-130¡ãC, and 90-160-160¡ãC), and five screw speeds (80, 100, 120, 140, and 160rpm) utilizing a one screw laboratory extruder.

Several processing parameters, including mass flow fee, net torque required, specific mechanical energy consumption, obvious viscosity, and pressure and temperature of the dough inside the barrel and die, were measured to quantify the extrusion tendencies of the DDGS-structured blends. For all blends, because the temperature profile increased, mass flow rate exhibited a slight decrease, die pressure reduced, and apparent viscosity exhibited hook decrease as well.

Likewise, the web torque requirement, particular mechanical energy consumption, and apparent viscosity decreased as screw speed increased, but mass flow rate increased. Additionally, as moisture articles increased, die pressure reduced.

At higher temperatures in the barrel and die, the viscosity of the dough was lower, resulting in lower torque and specific mechanical energy requirements. Increasing the DDGS content, alternatively, resulted in an increased mass flow price and decreased pressure in the die. As demonstrated in this plastic compounding machines scholarly study, selecting suitable moisture and temperature content levels are crucial for processing DDGS-based ingredient blends.

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