Hot runner nozzle - Günther Heisskanaltechnik ...

1.4. 41
iT
Insulation ring
Power connection
Fixed thermocouple
connection
Power connection
Fixed thermocouple
Fig. Single valve-gate nozzle 12NEST
Scew M10x1
There are three 0.1-mm shims over / under the needle
head.
Caution
When assembling / dismantling the needle holder (A/F
10), care must be taken not to deform the steel piston
rings. Use the flat of the piston! It is essential to put the
metal O ring back in after replacing the disk package. The
piston and/or the steel piston rings must be greased
again before assembly (GÜNTHER recommends Klüber
paste UH 196-402 [NSF registered]).
Furthermore, it is essential to ensure that the steel piston
rings have been inserted correctly. The rings have a
marking (XXX) on the face surface, indicating the side
that must point towards the pressurised side.
Installation of the complete nozzle
The cables for activating the needles are located at the
bottom of the nozzle. Accordingly the centring ring can be
produced as a “bell”. This measure makes it possible to
reduce the height of the mould.
Screw centring with at least 4x M12 (10.9) screws, with
due consideration to lift forces. For an optimum thermal
separation between the nozzle and the mould, use the
(blue) insulation ring.
Caution: Grind in the K dimension in compliance with the
data in the chapter. 2.3 yellow page.
Needle closing
Needle opening
Valve gate technology
Steel piston ring, large
Marking XXX
Steel piston ring, small
Marking XXX
Inlet/ outlet pipes for activating the needle
It is preferable to use channels with diameters of 6 mm
and a minimum length of 200 mm. The inlet and outlet
lines must be placed in the cooled mould plate in order to
prevent the medium overheating. If the mould
temperatures exceed the thermal stress capability of the
pneumatic valves, a separately cooled manifold must be
installed. The mechanics of the needle drive and the
valve gate nozzle are absolutely capable of withstanding
high temperatures.
Note on guarantee
GÜNTHER guarantees nozzle type NEST only if they
have been fitted or serviced on GÜNTHER premises or
by a GÜNTHER specialist. GÜNTHER will not provide
any guarantee for damage caused by the incorrect fitting
of the steel piston ring operated nozzle type NEST by
the pur-chaser, its representatives or contractors.
The same applies to inappropriate or neglected
maintenance.
www.guenther-hotrunner.com
Subject to technical changes 4/11