Heißkanaldüsen Typ SLT/-DLT Customer information
Heißkanaldüsen Typ SLT/-DLT Customer information
Heißkanaldüsen Typ SLT/-DLT Customer information
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<strong>Heißkanaldüsen</strong> <strong>Customer</strong> <strong>information</strong><br />
<strong>Typ</strong> <strong>SLT</strong>/-<strong>DLT</strong><br />
Smallest cavity pitches with the new micro flat nozzle type SFT/NFT<br />
A high number of cavities in a small space for micro<br />
articles made from technical thermoplastics is<br />
increasingly becoming one of the demands to be met<br />
today by modern injection molders. In order to enhance<br />
the economical efficiency in the production of such small<br />
articles, the trend today is going towards direct injection<br />
by means of a hot runner, in order to cut down on high<br />
sprue masses in comparsion to the part weight and to<br />
reduce cycle times determined by the sprue.<br />
GÜNTHER hot runner systems have always been<br />
especially well suited for these applications, on account<br />
of their excellent temperature control, outstanding<br />
thermal separation between the hot runner system and<br />
the mold, as well as technical innovations. The<br />
introduction of the SFT/NFT nozzle series has resulted in<br />
an additional wide range of possible applications.<br />
On account of their slightly different design as compared<br />
to conventional hot runner nozzles, cavity pitches from<br />
7 mm can be realized for open hot runner systems, and<br />
from 9 mm for hot runner systems with valve gate<br />
technology.<br />
The flat nozzles of the series SFT/NFT consist essentially<br />
of a metal tube with a tip, open passage or needle<br />
guide, a thermocouple and a nozzle body with integrated<br />
heating elements. The constant excellent temperature<br />
control of these nozzles with simultaneous high heating<br />
output in the area of the tip is achieved by the use of<br />
nickel-plated brass (CuZn) as basic material of the<br />
nozzle body and the two heating cartridges, which are<br />
operated via one control circuit.<br />
www.guenther-hotrunner.com<br />
7/12 Subject to technical changes<br />
Thermal separation from the mold is achieved by an air<br />
gap and by means of a special titanium ring in the contact<br />
area of the tip.<br />
The standard diameters of the material channel of these<br />
nozzles range from 2.8 mm to 6.0 mm, and they are available<br />
in the lengths L of 60 mm, 90 mm or 110 mm. It goes<br />
without saying that custom/made solutions to meet<br />
special application requirements are also possible. In<br />
this case, we recommend contacting our engineering<br />
department.<br />
The advantages of this line of nozzles are shown in the<br />
following example of an interesting application.<br />
The task was to realize direct gating of a part made of<br />
PPS GF30 with a weight of 0.1 g. The part is a housig of<br />
an electronic component and must be molded onto a<br />
punch-out strip for further processing. The customer also<br />
wanted to have separate thermal control of each gate.<br />
Thus, due to the specified size of the injection molding<br />
machine and the required number of 64 cavities, the job<br />
of the hot runner system was clearly defined.<br />
The processing of this glass-fiber filled high temperature<br />
plastic requires the use of a nozzle tip made of a special<br />
hard metal alloy to reduce tip wear and the use of a<br />
thermocouple suitable for high temperature applications.<br />
In addition, the high temperature application also<br />
requires full insulation with a material able to withstand<br />
manifold temperatures up to 600°C, minimizing the heat<br />
dissipation from the manifold.<br />
For any questions, please contact our Application Engineering department at +49 (0) 6451 5008-31 or -63.<br />
The <strong>information</strong> is given in accordance with our present-day knowledge and is meant to provide technical background.<br />
iA<br />
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