The process of grinding of rubber, or turning
post-consumer rubber into a valuable new resource, can be a difficult
application. Recyclers who are considering a grinder purchase
should first identify the end product that they are after. The
market offers plenty of grinders to choose from, with a variety
of options to match buyer needs.
John Farney is the national sales manager
at Cumberland Engineering. He said the firm and its subsidiary,
Cumberland Recycling, offer the most extensive array of granulators,
shredders and reclamation systems available in the industry.
“From specialty units for specific applications
such as tire recycling, and wire/cable reclaim, to systems for
PET and HDPE bottles, we develop solutions for any budget,” Farney
said. As a pioneer in the recycling industry since 1939, Farney
said Cumberland always strives to remain at the forefront of
product and solution development.
“Our annual sales are approximately $25,000,000,
but vary depending on the market sectors that are active at any
given time. We serve the recycling, extrusion, injection molding,
blow molding and rotational molding markets. In the last 18 months,
demands and needs have risen at a surprising but welcome rate.
Market increase is expected to total at 80 percent for fiscal
2010. Our biggest sellers are our X Series granulators, our 3200
Series granulators, and our shredder units,” Farney noted.
He added, “In the specific area of rubber
reclamation, quite a few of our models have been employed to
achieve high volumes of ground material, at exceptionally high
rates, with the lowest possible consumed energy. For end products
used as mulch-alternatives, molding compounds, crumb rubber and
alternative fuels, we achieve high quality. Incorporating the
highest level of safety, and ease of operation, our products
are developed to minimize maintenance time, and optimize safety
levels. Tilting hoppers, drop down screen cradles, hydraulic
systems to minimize manual labor and sound suppression measures
are just a few of our developments. From positive mechanical
restraints engaged during maintenance, to the most secure and
strongest knife mounting systems, our units are easy to clean,
maintain and operate.”
Farney said most Cumberland units are delivered
ready-to-install. Tall units require component mounting or stacking,
and evacuation systems require physical assembly. Unless any
wiring is needed, most units can be operational in hours. Intricate
systems involving wash lines, classification systems, and other
ancillary devices do require a bit more setup. “In today’s market,
the biggest challenge to processors is high volume at low operating
costs. We offer energy saving drive and operating systems, low
maintenance knives and screens, and strong, long-lasting knife
“We strive for minimal down time, and work
to reach the highest output per hour of operation. Current limiting
controls on start-up help control energy consumption and cost.
For operations, each pound is profit, and the more pounds per
hour, the higher the profits. But quality finished material is
crucial as well. Our long-lasting knives cut more efficiently
and require less sharpening than other formulations/designs.
Capabilities include tires, carpet, bottles, automotive scrap,
pallets and many other materials,” he said.
UNTHA shredding technology has been manufacturing
shredders for a wide range of applications since 1982. “UNTHA
invented and patented the original four-shaft shredder and continues
to be the world’s expert on low speed shear shredding, said Peter
Dion, regional sales manager.
“Because of high-torque, advanced cutting
systems, UNTHA two- and four-shaft shredders are ideal for tire
shredding. Our model S120 two-shaft shredder is used for pre-shredding
and for applications where exact particle size control isn’t
needed. The RS50, RS100 and RS150 four-shaft shredders add the
capability to provide controlled particle size and, using our
exclusive tire cutting system, of removing tire wire from the
rubber during shredding,” Dion said. He also reported that from
an operations standpoint, UNTHA’s shear shredders are well-suited
for shredding operations with production requirements up to 5
tons per hour.
“Tires represent the largest source of rubber
for reutilization and recycling in America. Over 300 million
scrap tires are generated annually. In recent years there has
been a lot of consolidation in the tire recycling industry, with
a migration to larger and larger machines. Still, there is a
need for smaller machines where tires are a secondary market
or where densification is required for efficient transport or
to add value. Production waste is also an interesting market.
A common application for a 4-shaft shredder is in a facility
where rubber products such as mats are manufactured. Cut-offs,
setup pieces and defective product can all be shredded and used
again, so nothing goes into a landfill. The UNTHA RS45 and RS50
machines are good machine choices due to their compact size and
rugged design,” said Dion.
He said his company has extensive experience
with four-shaft shredders, pioneered by the firm with many UNTHA-exclusive
features, such as the tire cutting system and dynamically-loaded
cutters with pneumatic shaft flushing, which are designed to
extend machine life and ease maintenance by keeping debris from
working its way under the cutters.
“The Austrian company’s attention to design
and detail ensures shredder longevity and economical operation.
UNTHA America provides sales, application, spare parts and service
for our United States and Canadian customers. Our service technicians
have worked for UNTHA in Austria for many years, and so they
have excellent experience in keeping our shredders performing
at their best. We recently unveiled redesigned versions of the
reliable RS30 and RS40 universal four-shaft shredders. These
small shredders have features which previously were seen only
on larger units, and several enhancements make the machines easier
to maintain and more versatile than ever,” Dion said.
“Weima is a manufacturer of single-shaft
shredders, which are used for primary breakdown of bulky vulcanized
rubber materials like tire tread, trimmings and other various
rubber scrap,” said Madison Burt, vice president, sales and marketing.
Weima has manufactured single-shaft shredders for more than 25
years to many markets, including plastic, rubber, wood, paper
“Weima’s shredder design includes a unique
access door that allows full access to the shredding chamber
for both maintenance and cleanout purposes. The single-shaft
shredder allows for batch feeding of bulky materials without
having to precut or separate the load. Weima America recently
received an order for a model WLK10-60HP shredder. It will be
used to process 1,500 pounds per hour of various vulcanized rubber
scrap prior to granulating. Our customer is thrilled with the
ability to load gaylord containers full of material into the
shredder without the need to separate the load or precut the
pieces,” Burt explained.