Size Reduction of Dates Eight-Times Faster with Screen Classifying Cutter

THERMAL, CA — Jewel Date Company grows, processes, packages and ships approximately 8 million lb (3.6 million kg) of dates and date products a year. In addition to selling whole and diced dates, the company grinds dates into flours, granules and powders it sells as ingredients to food manufacturers, and directly to consumers through its online store.

The company utilizes a Munson Screen Classifying Cutter to reduce dates into granules and powders within narrow size ranges.

Harvested dates are air-dried for two days to reduce moisture content from 50% to 7%, causing the dates to harden. "Anything greater than 7% and the dates will clump during processing," explains John Ortiz, sales manager. The dates are then cooled, loaded into a hopper and forklifted to a conveyor that transports them to the 11 in. (28 cm) wide throat of the cutter.

The company previously utilized a hammer mill which offered less capacity and particle size control.

"It took an eight-hour shift to process 2,000 lb (907 kg) of dates using the hammer mill, versus one hour to process the same volume using the SCC cutter, increasing our productivity eight-fold," recounts Ortiz.

Unlike a hammer mill in which a series of hammers strike and break the material until it passes through a bed screen, the screen classifying cutter employs re-sharpenable solid stainless steel cutter blocks that are welded without seams in a staggered array, and cut against two bed knives — one on the upswing, one on the downswing.

With the variable speed motor, the plant can run the cutter at 1,500 rpm to produce particles down to 1/16 in. (1.6 mm), or at 1,200 rpm for particles down to 3/16 in. (4.8 mm). "We can adjust the speed to output powders or granules according to customer requirements," says Ortiz.

The cutter reportedly imparts little or no heat to the material, which is critical because frictional heat or heated equipment surfaces cause date powders and granules to melt and clump.

The reduced material exiting the cutter is transferred by flexible screw conveyor to a vibratory screener that, in turn, discharges onto a belt conveyor for manual inspection and metal detection before being packaged and weighed for shipping.

Ortiz says, "The Screen Classifying Cutter has not required parts or maintenance in its first four years of operation, and it has fewer moving parts than our hammer mill." He adds, "Stainless construction with a food-grade finish allows us to clean it quickly."

Hot, dry conditions support date growth

Date palms grow in the Cochella Valley, a region of California’s Sonoran Desert, where temperatures range between 105°F (41°C) and 120°F (49°C) in the summer and rainfall averages one inch (2.54 cm) per year.

The desert’s hot, dry conditions and sandy soil are ideal for growing dates. The trees cannot tolerate humidity or rain, yet they require a lot of water. Therefore, the company employs a combination of drip and flood irrigation methods using water from the Colorado River and underground wells.

"Dates are naturally sweet and nutritious," says Ortiz. "They’re a great binder, and they’re stable. So we sell a lot of dates to companies that make nutritional bars."

Dates are also popular in granular or powder form as a natural sweetener. "We have several customers that use date powder as a sweetener in their teas," says Ortiz. "The powder of dates is 100% raw fruit, with no additives or preservatives."

Jewel Date Company
1 760-347-0996

In a dedicated room, dried dates are conveyed to the Screen Classifying Cutter which reduces them into granules and powders, which are then screened before packaging and shipping.

Jewel Date Company grows, processes, packages and ships dates and date products including whole and diced dates, date flours, granules and powders.

The Screen Classifying Cutter can be configured for gravity discharge (shown) or pneumatic pick up of size — reduced material.

The Screen Classifying Cutter employs re-sharpenable solid stainless steel cutter blocks that are seamlessly welded in a staggered array, and cut against two bed knives — one on the upswing, one on the downswing. The crevice-free rotor assembly and housing facilitate rapid, thorough cleaning.