Modern Plastics Worldwide - March 2010 - dae uptlax

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PROCESSING
TECHNOLOGY
assembly, such as delicate pin contacts, can be achieved.
The thermal conductivity of the polyurethanes, and thus the
heat dissipation of electronic assemblies, can be raised by adding
fillers and is largely independent of the material’s hardness.
Fillers also can be used to increase flame retardance. Coloring
and laser marking are possible.
In RIM, the two main components—isocyanate and polyol—are
introduced in liquid form into a countercurrent mixing
head via a dosing system. These are then homogenized and
injected into molds at low pressures (6 bar or less). In the mold
the material reacts to produce polyurethane. Finished parts
Encapsulating electronic components
is now simpler with reaction
injection molding.
can usually be removed from the mold in less than 2 minutes,
according to Bayer.
“A further benefit of manufacturing housings with polyurethane
is that the RIM process facilitates the production of
molded parts with wide variations in wall thickness,” explains
Gerd Viertel, who works on polyurethane encapsulation of
electronic components at BaySystems. “For example, it would
also be possible to produce thin housing shells that are rigid
and lightweight—with fully integrated reinforcing ribs, ventilation
slits, spring locks, and metallic design elements.”
Daniel Lüthi, managing director at Isotherm, says his firm
has developed machines with low discharge rates of less than
15 g/sec. Shots of as little as 2g are possible using specially
developed metering equipment. MD
LSR
With new silicone, no need
for rubber gaskets on oil
pans, cylinder heads,
and more
A team consisting of corporations and government have
created a sealant that could take the manual labor out of
gasket insertion.
Chemicals and silicone supplier Wacker, in collaboration with
the “society for innovation” (Inpro), a joint venture of BASF,
Daimler, Siemens, ThyssenKrupp, Volkswagen, and the state
government of Berlin, Germany, has developed a new silicone
rubber specifically designed to meet tough automotive-industry
16 MARCH 2010 • MODERN PLASTICS WORLDWIDE plasticstoday.com/mpw