Technical profile: new grain tempering system
April 01, 1996
by Teresa Acklin
Contributed by suppliers, technical profiles feature new technology, products, specific applications or proprietary concepts. This material was prepared by Graf GmbH, Lahnau, Germany.
How fast can water penetrate into the grain endosperm? How much time is needed to temper wheat or maize?
For a long time, these questions have posed big problems for most millers. Numerous trials and experiments have been conducted to solve these problems, but tempering time still remained the same anywhere from six to 24 hours. And when a mill expanded its capacity, it confronted the need to create new space to house additional tempering bins.
Using the principles of vibration, new technology has been developed that can slash tempering time by at least half, even for the hardest wheats. The principles are incorporated in the Vibronet series of dampeners.
Designed by an engineer who is also a miller, Vibronet coordinates the latest technology with modern sanitation to improve milling economics. By reducing tempering time, production time is cut and grists may be changed more quickly.
And because the temper screw is eliminated, energy savings can reach up to 15 hp or more. Vibronet uses 0.1 to 0.2 kilowatts per tonne per hour.
Costs for new construction or mill expansion also are lowered because no new bins are required. The Vibronet units' compact size also requires much less space than tempering bins.
With the Vibronet vibration dampener, water and grain enter the system at the top of the mixing chamber and pass through the vibration channels. Vibratory forces quickly drive the water into the grain; depending on the type of grain, tempering time is between two to eight hours.
The Vibronet systems allow water addition of up to 8%, and no changes are required to the mill flow or the milling process. The highest sanitation requirements are met, and because tempering time is relatively short, bacteria build-up is lessened.
The Vibronet vibration dampener can be used for a variety of grains, including wheat, barley, maize, rye and durum. It is a simple machine that needs only a few spare parts, and all are easily replaced.
An automatic water control panel, with or without programmable logic control, also is available for the vibration system. With the control panel, tempering can be completely automated.
The vibration dampener is available in five models, with the largest having a capacity of up to 25,000 kilograms per hour. Vibronet dampeners are sturdy and reliable, and more than 100 units have been sold to date.