Plastics News - Show Daily - October 17, 2023 - 16

16 * Plastics News, October 17, 2023
FAKUMA SHOW DAILY
KH KUNSTSTOFF
HELMBRECHTS AG
Hall B5, Booth 5213
KIMW KUNSTSTOFFINSTITUT
LÜDENSCHEID
Hall A5, Booth 5312
Glassomer uses
plastic to mold glass.
NeptunLab photo
Plastic, glass come together
in new molding technologies
By David Vink
Plastics News Correspondent
Following fi ve years of development
work, injection molder
KH Kunststoff Helmbrechts AG
has brought overmolding of glass
panes or lenses with unfi lled,
fi lled or reinforced thermoplastics
in a single injection molding
process to serial production.
Despite different thermal expansion
coefficients of the two
materials and the inherent brittleness
of glass, which usually
makes it extremely difficult to
withstand high injection pressures,
the first part developed
used 1-millimeter-thick glass
with a diameter of several millimeters.
Precise
robotic positioning of
glass components in the mold
is essential. Although glass and
thermoplastics do not readily
bond, thermoplastic shrinkage
ensures an airtight seal without
damaging the glass and is
checked by inline camera and
leakage inspection.
In order to maintain a competitive
advantage, KH has not
revealed more process details.
It claims: " Earlier attempts elsewhere
were made with a soft
intermediate layer between the
glass and plastic. "
The technology is a Fakuma
2023 highlight for Helmbrechts,
Germany-based KH Kunststoff
Helmbrechts.
Glass panes
can be
overmolded with
high-gloss skin
structural foam in
close contour rapid
heating and cooling
mold tools without
a soft intermediate
layer. "
Stefan Schmidt
KIMW Kunststoff-Institut
Lüdenscheid
Overmolding without
a soft layer
In its KuGlas project, Lüdenscheid,
Germany-based
KIMW
Kunststoff-Institut
Lüdenscheid
has successfully injection overmolded
glass panes without resorting
to a soft intermediate layer.
KIMW Managing Director Stefan
Schmidt told Plastics News that
KIMW didn't assist in KH's development.
Schmidt added: " KuGlas
used structural foam-cored ABS
combined with ball-fi lled mold (BF
mold) close contour variotherm
rapid mold heating and cooling. "
Schmidt was referring to demonstrations
on a Wittmann EcoPower
Real glass out
of plastic
Frederik H. Kotz, chief sales
offi cer responsible for process
innovation at Freiburg im Breisgau,
Germany-based Glassomer
GmbH, talked about a glass project
at the November 2022 Compamed
trade show in Düsseldorf.
Kotz said the technology injection
molds fused silica glass for
next-generation medical solutions
110/350 press, when BF mold also
produced a high-gloss deep piano
black surface on the foamed ABS
surrounding glass panes, without
a typical foam swirled surface.
for " glass parts with a nearly unlimited
design space. "
Glassomer technology overcomes
low production speed,
poor scalability and high energy
input inherent to conventional
glass molding and also has injection
blow molded bottle potential.
Glassomer SL-50 is a 50-100
nanometers amorphous silicon
dioxide nanocomposite, based
on high purity powder from glass
fi ber production, an industrial
thickener often contained in cosmetics
or toothpaste, with polyvinyl
butyral (PVB) and polyethylene
glycol (PEG) binders.
Following extrusion and granulation,
the material is injection
molded at 130° C on an e-motion
50 TL tie-barless Engel press
equipped with a viper linear robot.
The " green " moldings are aqueously
debinded in two stages and
Our Glassomer
glass is
initially a plastic.
Just think of putting
a plastic spoon
in an oven and it
comes out as a
glass spoon. "
Bastian Rapp
Glassomer GmbH
then sintered at 1,300° C, fusing
silica into glass, compared with
above 2,000° C with conventional
glass forming.
Microfl uidic glass parts can be
made by bonding two green moldings
containing fl uid channels together
prior to sintering. Similarly,
microstructured metal mold inserts
can enable molding/sintering
of microstructured surface glass
lenses without laborious grinding.
Glassomer started small- to
mid-scale injection molding at the
end of 2022. Large-scale molding
is scheduled for the end of 2023
or 2024.
Glassomer GmbH was spun off
in 2018 by Kotz and Chief Technology
Offi cer Bastian Rapp from
their initial Glassomer development
work in Freiburg University's
NeptunLab process technology
laboratory.

Plastics News - Show Daily - October 17, 2023

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Plastics News - Show Daily - October 17, 2023 - 1
Plastics News - Show Daily - October 17, 2023 - 2
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Plastics News - Show Daily - October 17, 2023 - 4
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