Heißkanaldüsen Typ SLT/-DLT Customer information

Heißkanaldüsen Typ SLT/-DLT
Preventing flow marks on injection molded parts
Apart from flow marks being avoided, two further quality
features of the manufacturing process have caught Mr.
Puppe's eye: “Virtually no warpage and no sink marks on
the whole length of the light covering panels, this is really
amazing. We would not have been able to get such a
result with conventional nozzles.” Last but not least, the
design of the new nozzle enables particularly fast color
changes. This is because the melt channel is designed to
optimize flow so that the material comes to rest nowhere,
which results in an optimal melting process.
„Without a nozzle type with a
multi-purpose pluggable tip, we
would have had to use a 2-drop
manifold for this application, “ adds
Puppe, „this would have forced up
the prices. The costs of a nozzle with
a multi-purpose pluggable tip are
only marginally higher than those of
a conventional nozzle. Thus, better
Werner Puppe product characteristics are
technichal manager, combined with decreased process
at Werner Langer, costs.“
a plastics processing,
company from
Meschede
Molds on hand can be retooled
The multi-purpose pluggable tip is intended primarily for
parts that have to meet demanding requirements for
optical clarity, such as, for example, applications
involving polycarbonate or PMMA, or perhaps POM
homopolymers. “No applications using fiberglassreinforced
plastics have been implemented so far.
However, they are also possible if the tip is made of hard
metal,” says Ehlert.
The customer of Werner Langer chose an opaque white
shade for the light covering panels, which limited the
selection of the material right from the start. A PMMA-
type material, optimized for transparency and lack of
streaks, is used for this application.
Since the part is closed on the one side and open on the
other, different flow paths in the mold are the result. To
obtain a proper nozzle position, a mold flow analysis was
carried out to come up with an off-center positioning of
the nozzle. “During the sampling inspection as well as
when starting up the mold, there was not a single
problem with the hot runner nozzle,” says Puppe.
“Plug&Play”, this is how he describes the change-over to
the new nozzle concept.
The tool is installed in an Engel injection molding
machine, type 1050/200, with a clamping force of
2,000 kN. A linear handling device takes the parts and
puts them on a conveyor belt where they are manually
packaged. Molds on hand can be retooled with the new
kind of nozzle. In fact, the installation of a nozzle with a
multi-purpose pluggable tip requires just a little
modification of the mold contour. “However, only very
small modifications are necessary to replace a
GÜNTHER hot runner nozzle,” says Ehlert.
Wide range of applications
It is only natural that recently developed products, such
as the multi-purpose pluggable tip, which are relatively
new on the market do not immediately become
widespread in applications. First of all, it is necessary to
gain experience, and test the basic applications in longterm
studies. For one and a half years now, the multipurpose
pluggable tip has been included in the product
range offered by GÜNTHER. The market entry phase is
over, and Ehlert sees large areas of application, for
instance, in the automotive industry, as well as for every
application which requires optical parts.
For Werner Langer, the testing phase is over for some
time already, at least with regard to the light covering
panels; the production is a complete success. Puppe is
confident: “When it comes to the production of optically
demanding parts, we will continue using the nozzle with
a multi-purpose pluggable tip.”
For any questions, please contact our Application Engineering department at +49 (0) 6451 5008-31 or -63.
The information is given in accordance with our present-day knowledge and is meant to provide technical background.
1.5. 12
iA
Customer information
The light covering
panels are manufactured
on an
Engel injection
molding machine,
type 1050/200,
with a clamping
force of 2,000 kN.
www.guenther-hotrunner.com
Subject to technical changes 7/12