fish feed extruder with steam pre-conditioner

Apr 17, 2017 · Preconditioning is commonly used in both the pelleting and extrusion manufacturing of aquafeeds. In the preconditioning process, low-pressure steam is added to heat and increases the moisture of the meal. In the pelleting process, the maximum moisture that can be attained without causing the pellet mill to plug up is 17 percent.

Apr 1, 2001 · The mash to be extruded is fed from a holding bin, through a steam pre-conditioner, and into the extruder barrel. The pre-conditioner hydrates the mash to 18 to 25 percent moisture and simultaneously mixes and heats the mash to 80 to 95 degrees-C, at average retention times up to 2.5 minutes.

Mar 9, 2021 · The primary purpose of preconditioners is to prepare the raw material prior to the next step of extrusion. This is mainly achieved by adding steam and water into the raw material and mixing it for 2-4 minutes. A general design of a preconditioner would have an inlet for water to be sprayed and steam into an enclosed chamber with mixing paddles.

Aug 1, 2022 · In this work, Fish Feed pellets for adult Trout were successfully manufactured at pilot scale through extrusion cooking without a preconditioner. The gelatinization of starch can be entirely conducted inside the twin-screw machine, thus reducing the investment cost of the industrial lines.

May 20, 2011 · The fish feed kibble described previously is manufactured on a modern ‘steam’ extruder, where the cooking energy inputs are evenly distributed between injected steam in the conditioning cylinder and the extruder and mechanical work input in the extruder.

In the extrusion process, water is intrinsic in the ingredients and is also added via steam condensation in the preconditioner or directly into the extruder barrel. As water is added in the extruder to levels greater than 10 percent, the biopolymers hydrate and move more freely.