Background Image
Previous Page  5 / 6 Next Page
Show Menu
Previous Page 5 / 6 Next Page
Page Background


From a revolutionary idea

proposed and developed by Dr.

Andrew Szegvari in 1945, Attritor

technology grew to become the

basis for Union Process, Inc., an

independent family-owned American

company founded in Akron, Ohio.

Today, Attritors are considered to be the most efficient

grinding/dispersing systems and are used in scores of

industries and research laboratories worldwide.

How Batch Attritors Work

The Attritor is often referred to generically as an

“internally agitated high energy media (ball) mill.” The

operation of an Attritor is simple and effective. The material

to be ground and the grinding media are placed in a

stationary, jacketed tank. This media is spheres 3/32" to

3/8" diameter. Commonly used types are carbon steel,

stainless steel, chrome steel, tungsten carbide, ceramic, or

zirconium oxide.

The material and the media are then agitated by a shaft

with arms, rotating at high speed. This causes the media to

exert both shearing and impact forces on the material,

resulting in optimum size reduction and dispersion.

No premixing is necessary. The material can be directly

fed into the jacketed grinding tank of the Attritor. Those

portions of the formulation requiring only slight grinding can

be easily added later.

Attritors are equipped with specially designed high

starting torque, two-speed electric motors. The high starting

motor means no clutches, etc. are needed. The lower speed

is used for charging and discharging and the high speed is

used for grinding. Depending upon the application,

electricals can be TEFC (totally enclosed fan cooled) or


Production batch Attritors are equipped with a built-in

pumping system that maintains circulation during grinding

for accelerated attrition and uniformity. This pump can also

be used for material discharging. The final result of the

grinding action is a fine, even particle dispersion.


control (either

cooling or heating)

can be maintained

due to the use of

jacketed tanks.

When high-pressure

water, coolant, oil or

steam systems are

required, ASME-

coded tank jackets

may be employed.

Because grinding

action does not take place against the tank walls, wear of

the walls is minimal. In addition, thinner walled tanks mean

that improved heat transfer can be accomplished.

Common Applications/Industries

Union Process Batch-Type Production Attritors

Produce Fine, Homogeneous Dispersions

Quickly and Effectively

Special Options

TANK LININGS—special linings for metal-free grinding are

available. Choose from ceramic (alumina) tiles, food grade

rubber or polyurethane.

ARM SLEEVES—to accommodate metal-free systems, shaft

arms may be sleeved with plastic, tungsten carbide, or

zirconium oxide.

COVERS—can be equipped with a floating shaft seal to

minimize solvent loss, or can be equipped with a MECO shaft

seal for grinding under inert gases, complete with a product

charging port, gas inlet and outlet.

TORQUE METER—for monitoring precise energy consumption

which is used for determining grinding time and for added

quality control.

DRIVES—variable speed drives (either mechanical or

electronic) are available for conditions requiring the flexibility of

multiple shaft speeds.

STATIONARY ARMS—for reducing tank wear

SPECIALLY CONFIGURED ARMS—for increased agitation and

improved performance



Agricultural Flowables


Biofuel/Cellulosic Biomass




Chocolate, Confectionery


Cryogenic Grinding

DSM (Mechanical Alloying)

Electronic Ceramics



Food Products

Glass Frits

Industrial Coatings

Metal Oxides

Metal Powders and


Minerals, Coal

Paints, toners, inks

Paper Coatings




Reaction Milling/



Tungsten Carbides