Process design
considerations

Throughout the extensive testing of the E975 Extruder, specific, noteworthy design concepts were proven:

Critical to the design of an extruder such as the E975 is precision machining of all barrel components, including rotating elements.

Design features

Crucial to the design was precision machining of all extruder barrel components, including rotating elements. Our high engineering standards and strict manufacturing constraints enabled the E975 Extruder to exceed expectations for screw-tip speed, product velocity and head pressures—all important factors when considering machine flexibility.

Versatility in this extruder’s operational speed, especially at high RPMs, in relation to standard extrusion provides unique advantages that are apparent when looking at higher rates of production.

■ Effective preconditioning is critical for optimum performance of this system when considering it for a wide spectrum of production uses. In the production of standard cat or dog foods as well as when manufacturing pet treats, typical or standard preconditioner setups will suffice. However, for use in premium petfood production that utilizes high levels of added oil and fresh meat, an advanced paddle setup such as that with the Extru-Tech Dual Conditioning Cylinder (DCC) is required.

 

The proven segmented screw design technology was implemented into this extruder. Maintaining a segmented screw profile did incur some additional system development challenges. However, the cost-effective benefit in regard to wear-component replacement is not trivial. ■

■ Using a back pressure valve (BPV) such as the Wenger BPV is required. The primary design concept for maximum product flexibility is the single, continuous flight (via segmented screw components indexed properly). This configuration is purposely designed to remove mechanical