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The Evolution

of Milling



s Dr. Andrew Szegvari prepared to

display his new liquid latex process for making

rubber goods at an exhibit in Paris, he

needed an extremely fine sulfur dispersion

to complete the vulcanizing process.

Conventional ball milling methods in 1922

would have taken as long as a week to

obtain the fineness he required.The

problem…not enough time.

Szegvari hit upon the idea of using pebbles,

a gallon can, a drill press, and a special

agitator he designed for the drill bit to achieve

a fine dispersion. In less than an hour, he invented

an apparatus that would produce exactly what he needed.

That first apparatus, employing the dynamics of grinding

media in random motion, marked the beginning of a new

media milling technology, a process now known as Attritor

grinding and dispersing.

In 1946, Dr. Szegvari founded Union Process, operating in a

small plant in downtown Akron, Ohio.The new company’s

mission was to develop grinding and dispersing technology

to help customers make fine dispersions quickly, reliably,

and inexpensively.

The original Szegvari Attritor


, a batch machine, evolved

into new machine designs—Continuous Attritors for on-

line production, Circulation Attritors for very narrow

particle size distribution and even small media mills for

grinding to submicron or nano-range particles.

After more than 20 years of constant growth, the

company moved in 1968 to its present location,

a custom-built research, design, and production center

just outside of Akron.This Midwest location provides

convenient access for customers who choose to visit

the Union Process headquarters.

From need To invenTion

Union Process Today

Scores of patents, refinements and advancements later,

Union Process milling technology now plays a vital

role for many Fortune 500 companies in a

wide array of industries including chemicals

and tungsten carbide. In addition, the

foremost chocolate and confectionary

processors, ink, paper, agricultural flowables,

metal, magnetic oxide, coal, mineral, rubber,

pharmaceutical, cosmetic and ceramic

producers all employ Union Process

milling technology.

Union Process maintains a global network of

licensees and agents with the expertise to assess,

analyze, sell and service customers’ needs.

Whether it is manufacturing innovative laboratory mills

for R & D or producing large mills capable of grinding

tons of material per hour, Union Process is dedicated

to remaining on the forefront of milling technology.

Today, in addition to building its line of grinding and

dispersing equipment, Union Process maintains a tolling

processing plant and research lab that helps companies

develop and produce their products.