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Classification Of Meat Meal In The Production Of Animal Feed


Meat meal is a byproduct of inedible rendering and may be high in fat (up to 12%) from expellers and presses, or made low-fat from solvent extraction. Meal is used in animal feed formulations and specifications call for 100% passing through screens ranging from 8- to 16-mesh and minimum quantity of fines. Hammer mills are used with perforated screens ranging from 3/16" to 5/16" and operate closed-circuit with vibrating screens. Power requirement is approximately 13 HP per ton of feed, and efficient classification results in minimum power demand and reduction of fines produced.

Method and results

A single deck 48" diameter Kason VIBROSCREEN Circular Vibratory Screener will handle the output of the largest mills need for this service, which seldom exceed 125 HP or 10 TPH maximum. Feed rate to the screen may be higher than this depending upon the recycle load. The Kason may be arranged for accepting air-swept hammer mill output via a cyclone collector. This is usually the case on expeller product but on solvent-extracted meal, it is best to screen ahead of the mill since a large percent of the feed is of required size. The Kason feeds the mill directly, which recycles its output to the Kason. Capacity will depend upon the hammer mill screen selected, the particle size distribution of the mill output and product size required.


1. Virtually all conventional vibrating screens blind severely on this application, particularly when high-fat meals are encountered. Hair plus other fibrous materials together with fat stick tenaciously to the woven wire screen and nearly continuous operator attendance is required to keep the screen open by brushing. The Kason's unique vibrating action combined with a rubber ball anti-blinding device results in absolutely no blinding even on very high fat meals. Units have actually been in operation for several years without necessitating screen cleaning.

2. A 48" diameter Kason circular vibratory separator for this service only requires 3 feet of head room, making installation in a recycle circuit very simple. The complete absence of transmitted vibration to supporting structures also contributes to ease of installation.

3. The Kason method of screen cloth mounting results in uniform tension and the cloth vibrates in unison with the entire screening assembly. There is no wire flexing or whipping against rigid supports and barring accidental damage, screens will last for several years on this application.

4. The Kason's circular motion eliminates channeling common on inclined vibrating screens and this combined with freedom from blinding results in the discharge of true oversize to the hammer mill. By eliminating specification product from this recycle stream maximum tonnage per HP can be handled and the product is free of excessive fines.


  • Epoxy-coated carbon steel construction with stainless steel screen cloth.
Kason Application Data No: 8