Food Drying Equipment

Food drying equipment

Food drying equipment

The field of the invention is food drying equipment and methods. In particular, the invention discloses a rotary dryer which dries food granules, such as rice, by rotation within a perforated cylindrical barrel, to prepare the rice for packaging. The dryer provides high velocity drying zones along its length, and high temperatures may be used.

BACKGROUND OF THE INVENTION

The drying equipment relates to a method and equipment for processing foodstuffs; more particularly, this invention relates to methods and equipment for processing rice to achieve a quick-cooking rice.

In the past, the problem of "gluing" of food granules by the release or rupture of starch molecules could be controlled, at least to a limited degree, by using large amounts of fluid in transporting the food through the processing machinery, cookers, conduits, and the like. Typically, water is used as a transport fluid, and large amounts of water tend to dilute the "glue" (free hydrated starch), thereby minimizing the adverse effect of free starch. By using large amounts of water, cereal grains may be processed without the undesirable globules forming to slow the transport of the grains through processing equipment(coffee processing equipment). However, such use of water to dilute this gluing effect results in spent process water with large amounts of free starch which must be discarded or further processed such as by water treatment.

SUMMARY OF THE INVENTION

The grain dryer comprises a method of drying a food granule slurry which comprises water and wet food granules, wherein a wet food granule slurry to be dried is subject to a water separation step in which excess water is taken from the wet food granule slurry. Warm air is then blown upon the food granules to reduce the water content of the food granules, and then they are agitated using rotary motion and dried while proceeding through a perforated rotating barrel. The barrel rotates at a speed that results in the application of no more than about 1 g of radial force upon the food granules. Further, the invention provides separate identifiable temperature zones along the path of the food granules whereby separately identifiable regions of the dryer are operated at air speeds of greater than about 2000 feet per minute air outlet velocity.

In another aspect of the food drying equipment, a method is provided wherein the residence time of the food granules within the rotating barrel may be adjusted by allowing the food granules to remain within the rotating barrel until the food granules are sufficiently dried to facilitate their escape from the rotating barre

by: wan

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