Forsberg designs and manufactures the destoner
that other destoners are compared to. The destoner
operates on the basic principle of flowing dry granular
material over a vibrating, screen covered deck that is
inclined.
Forsberg manufactures two types of destoners:
Pressure-type with an open deck and
the fan placed inside the box creating a positive air
pressure up through the vibrating deck with screen.
Vacuum-type which is completely enclosed
with a fan mounted away from the machine, creating a
"suction" of air through the vibrating deck with
screen.
The Forsberg Destoners have the same basic function as
a it separator with the only difference being the
destoner has two fractions - light & heavy, and the
gravity separator has multiple fractions.
The basic principle involves flowing dry material over
an inclined, vibrating, screen covered deck. The steady
air flow holds the material in stratified flotation. The
lighter material stays in the upper strata as it flows
down the inclined vibrating deck with screen. The heavier
material, such as stones, coarse sand, glass, metal,
etc., travels up the inclined vibrating deck and out.
Destoners are placed in many different locations in a
cleaning system, both before and after cleaners and
gravity separators. Destoning is not only used as a means
of eliminating contaminants to improve the purity f the
product, but is also essential to remove stones to
eliminate excessive wear on all types of grinding mills,
flaking machines, etc.
Air is then dispersed through the deck and product
where the separation begins. The steady air flow holds
the lighter product in stratification as it advances down
the inclination of the vibrating deck. The heavier
material such as stones, glass and metal, travel uphill
and out. The product is then directed toward the
discharge end of the deck where the finished product is
collected and often needs no further refinement. Forsberg
destoners are known for their remarkably fast and
thorough separation of heavy foreign material removal.
Right now they are working throughout the world on
spices, chemicals, coffee, peanuts, cereals, beans,
wheat, minerals, and numerous other products.
