Plastics Engineering - May 2014 - (Page 8)
Injection Molding's Wild Side __________________________________
headquartered in nanterre, France, in the late 1990s. The
machines were then built commercially for Faurecia by
KraussMaffei Technologies gmbH in Munich, germany,
which showed a prototype at K 2001. It replaced forming of
gMT glass-filled sheet, which was both expensive and laborintensive.
KraussMaffei also began combining thermoplastic injection
molding with RIM, showing an injection-molded PA6 car
seat belt cover with RIM PU coating at K 2004. More recently KraussMaffei combined thermoplastic and thermoset for
a two-component cowl for the Peugeot 308 hatchback (European car of the Year for 2014), molded by Weidmann Plastics
Technology Ag in Rueti, switzerland. That multi-process
machine included a 550-ton KraussMaffei injection molding
machine with three injection units, rotary mold, four robots,
and a Rimstar mixing and metering machine.
Multi-process thinking got a big creative boost around
2007, when KraussMaffei presented a complete Miele wash-
ing machine door, made automatically. The components
were molded in three multi-process injection molding
machines and assembled robotically. One press molded
the Pc front panel on a spinForm rotating mold, then overmolded it with gray ABs for scratch resistance. sprues were
removed automatically and edges smoothed with hot air and
a protective film added. A second press molded structural
glass-filled PP around the window glass and fasteners with
hinges added automatically. A third press molded interior
high-gloss ABs panels. Then the three parts were assembled
and glued robotically.
samsung Electronics co. saw the part and thought of flat
screen TVs. so, samsung bought large machines from KraussMaffei and Engel Austria gmbH to develop and mold
complete flat TV screens on rotary molds. They're still one of
the biggest multi-shot parts made with rotating molds. Tiebar clearance, within which the mold has to turn, is an issue
with big parts. Automotive windows are also being molded
RocTool's rapid induction heated molds enable multi-shot production of parts with matt and high gloss surfaces, even over woven
carbon fiber, without needing subsequent coating (photos courtesy
of RocTool).
8
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Plastics Engineering - May 2014
Table of Contents for the Digital Edition of Plastics Engineering - May 2014
Contents
Plastics Engineering - May 2014 - Cover1
Plastics Engineering - May 2014 - Cover2
Plastics Engineering - May 2014 - Contents
Plastics Engineering - May 2014 - 2
Plastics Engineering - May 2014 - 3
Plastics Engineering - May 2014 - 4
Plastics Engineering - May 2014 - 5
Plastics Engineering - May 2014 - 6
Plastics Engineering - May 2014 - 7
Plastics Engineering - May 2014 - 8
Plastics Engineering - May 2014 - 9
Plastics Engineering - May 2014 - 10
Plastics Engineering - May 2014 - 11
Plastics Engineering - May 2014 - 12
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Plastics Engineering - May 2014 - 14
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Plastics Engineering - May 2014 - 16
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Plastics Engineering - May 2014 - 18
Plastics Engineering - May 2014 - 19
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Plastics Engineering - May 2014 - 28
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Plastics Engineering - May 2014 - 30
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Plastics Engineering - May 2014 - Cover3
Plastics Engineering - May 2014 - Cover4
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