Hot runner nozzle - Günther Heisskanaltechnik ...

Hot runner nozzle
±0.02
Z
Fig. Nozzle length at room temperature
Standard
90°
Increased angle
120°
Attention!
Provide for adequate
wall thickness.
Fig. Modification of forechamber geometry
120°
Fig. Employment from a titanium sleeve
www.guenther-hotrunner.com
4/11 Subject to technical changes
Insulation gap
Insulation gap
Titanium sleeve
Insulation gap
iT
Nozzle length at room temperature
Our nozzle length is made to the size
that already provides for ist length
change when heated to 250° C. The
nozzle tip will then extend by 0.5 mm
into the cavity contour. Dimension Z
(as measured at room temperature)
is equal to:
Z = L + 0.5 - l (250°)
l consequently depending on L
itself.
l is the temperature dependent
longitudinal expansion of the
hot runner nozzle.
Modification of fore chamber
geometry
Fore chamber geometry can be
modified for special applications or
difficult-to-process materials (e. g.
V0-adjusted materials).
To avoid mistakes, we recommend
that you consult with our
application engineers.
Enlarging the angle to 120°
The standard angle of 90° in the forechamber
can be widened to 120°.
This will enlarge the insulation gap
between the hot runner nozzle and
the mold. The nozzle can be operated
at a lower temperature so that
thermally sensitive material will not
be damaged.
Using a titanium sleeve over the
nozzle shaft in combination with
an angle of 120 °.
The insulation gap between the hot
runner nozzle and the mold also
becomes larger and the heat transfer
to the cavity plate is reduced.
1.4. 30