EXTENSIVE REDESIGN OF SHUTTLE™
GRANULATOR BOOSTS RUGGEDNESS,
INCREASES STABILITY AND SMOOTHNESS OF OPERATION
System, Radically Different from Standard Rotary Granulators, Is Still Much
Smaller and Less Energy-Intensive, and It Requires Substantially Less Investment
June 23, 2003
one expects a heavy-duty granulator to purr like a kitten, but a top-to-bottom
redesign of the Maguire® Shuttle™ granulator has increased the smoothness and
reduced the noise with which the machine transforms large parts and purgings
into high-quality granulate, it was announced at NPE 2003 by Maguire Products,
Inc. (Booth 9101).
new-generation Shuttle granulator is more rugged than ever and carries out its
unique 'planing' operation even more quietly and efficiently, withstanding
the vibrations and shocks of size-reducing dense, bulky objects like purgings,"
said Kevin M. Cabana, general manager of Maguire's U.S. Granulator Div., based
in Smithfield, Rhode Island, U.S.A. "What
has not changed is the advantages of the Shuttle granulator in comparison with a
conventional rotary purging grinder. The
Shuttle unit is still one-fourth the size of a comparable rotary machine, still
requires only one-tenth the power, and still costs about 80% less."
among the improvements to the Shuttle granulator cited by U.S. Granulator
engineer Brian Kenney are the following:
construction. Maguire has
enhanced the stability and structural integrity of the Shuttle granulator by
increasing the ruggedness of the base, shuttle table, hopper walls, and other
components. "We've increased
the thickness of major steel panels by 50 to 400%, depending on the component,
and have enhanced certain other parts as well," Kenney said.
"In addition, we've adopted more heavy-duty construction for impact-
or load-bearing components - changing the shuttle beds, for example, from formed
sheet metal to a reinforced weldment."
has replaced the all-pneumatic shuttling system previously used to move the
hopper back and forth with a pneumatic/hydraulic system. "Since oil is much more resistant to compression than air
in response to shocks generated as heavy parts
encounter the rotor knives, the new system exhibits a smoother, better
controlled hopper movement," Kenney said.
noise. Besides the improved
shuttle operation, another factor in noise reduction is a redesigned machine
base and sound enclosure. "The
machine base to which the enclosure is attached is now fabricated of heavy-duty
steel," Kenney said. "As a
result, there is less transmission of vibration from the granulator proper to
the sound enclosure."
benefit of the new base design is that it readily accommodates forklift blades,
Shuttle granulator combines two size-reduction steps into one two-stage unit.
Each stage incorporates a radically new concept in size reduction: first,
a planing process similar to that used in carpentry, then a grinding process
carried out by the MaguireÒ
granulator. In the first stage of
Shuttle granulator operation, the scrap or reject part is automatically shuttled
back and forth over a table surface that is split into two levels.
As in a carpenter's plane, a cutter is mounted at the point of
disjunction. In the Shuttle design,
the cutter consists of a rotor carrying a series of staggered knives rotating at
1,750 r.p.m.; this cutting action reduces the gravity-fed scrap to small pieces
and propels them at high speed into the hopper of a Radial granulator located
beneath the table. The Radial
granulator completes the size-reduction process, yielding uniform, high-quality
standard Shuttle models are available: the S-20 has a hopper or scrap
containment chamber that is 20 by 30 in. (51 by 76 cm); the S-30, 30 by 30 in.
(76 by 76 cm).
PRODUCTS, INC., headquartered in Aston, Pennsylvania, U.S.A., is the world's
largest supplier of gravimetric blenders and liquid color pumps and also
manufactures loading systems, granulators, dryers, auger feeders, and related
equipment. Its customers include
injection, blow, and rotational molders, extrusion processors, and compounders.
Founded in 1977, Maguire operates five manufacturing facilities in Aston
and Smithfield, Rhode Island, U.S.A. The company maintains a network of
distributors in the Americas and overseas.
Europe, a sales and service subsidiary that supports customers
throughout Europe, operates a distribution center in Tamworth, Staffordshire,
United Kingdom. Maguire Asia, based in Singapore, serves customers throughout
South Asia and the Pacific Rim. Visit the Maguire Products web site: www.maguire.com