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Abstract:
In an injection-molding machine, because
of the nature of polymer flow, significant viscosity
changes occur within the plastic as it fills the
mold cavities. These changes dramatically affect
the way a cavity fills and the quality of the
part being produced. The effects will be evident
in both single-cavity and multi-cavity molds.
New melt-rotation technologies and rheological
control systems add new dimensions of quality
and process control within the mold itself. These
technologies improve and optimize the balance
and filling of a mold by managing the plastic’s
rheology within the melt-delivery system. And
the benefits can be achieved through “Design
for Six-Sigma” principles, right within
the mold design itself, without changing gate
location, part design, material, or process settings.
Among the numerous benefits are the ability to
enhance flow in thin-part geometries, reduce warp,
balance filling, improve Cpk’s, enhance
part cosmetics, and improve filler dispersion.
Presenter:
David
Hoffman, Beaumont Technologies, Inc.
David Hoffman holds an associate’s
degree in mechanical engineering technology and
a baccalaureate degree in plastics engineering
technology. He is the author of various published
ANTEC papers. He has worked as engineering manager
for an automotive supplier of high-precision plastic
components and assemblies, involved in part design,
processing, mold design, quality control, quoting,
and customer support. David then worked with Mack
Molding as a sales engineer with similar job responsibilities.
He is currently the Director of Technical Sales
& Marketing for Beaumont Technologies, Inc.
(BTI), based in Erie, PA, where he has worked
with John Beaumont to develop and patent the company’s
next generation of melt-rotation technology, known
as MeltFlipper MAX™, and where he also uses
his experience to enhance development of BTI’s
technologies to meet the needs of the auto industry.
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