TPT March 2016

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74 MARCH 2016
T E CHNOLOG Y
Co-extrusion crosshead for irrigation tubing
GUILL Tool has introduced the Series
824, a co-extrusion crosshead designed
for irrigation tubing with an emitter tool.
Manufactured from stainless steel,
this new crosshead features balanced
flow design with spiral technology
that improves flow characteristics at
all extruder speeds. Dual feed ports
provide concentric compound flow,
while the splits flow from one extruder
to feed the inside and outside layers
via a manifold assembly. Series 824
is adaptable to all popular extruders
currently on the market.
Capacities include a max die ID of
1.875", maximum core OD of 1.25",
maximum tip OD of 1.5" and maximum
emitter tool OD of 30mm (1.18"). The
Series 824 design allows the emitter
insertion tool to pass completely
through the crosshead ID. Gum space
adjustment is performed with die nut
rotation, while the Guill two-stage
clamping mechanism allows easier
concentricity adjustment. Quick-
change tooling and a tool
kit for disassembly and re-
assembly are provided with
the unit.
Bill Conley, salesmanager
for Guill, commented: “On
this project, the customer
challenged us with an
application that required
precise placement and
bonding of preformed
emitters within the extruded
tubing without melting them
in the crosshead. It was
also necessary to process
either a low-cost ABA layer
construction or single-layer
construction within the
same unit.”
With the Series 824 the customer
realised cost reductions, better quality,
less scrap and more uptime in their
process. The Guill cool-tube design
prevented the emitter from melting
in the head, and the overall unit
mechanics allowed more rapid and
easier changeover from a co-extrusion
to a single layer.
On this project Guill also supplied the
customer with the company’s extrusion
tool cart, which facilitates easy alignment
and tool changes. The removable cart
swing gates stay free from accumulated
process fluids, while the adjustable
height means the cart is compatible with
virtually any extruder model. Thermal
isolation in the design keeps heat in the
head, not the cart.
Guill Tool & Engineering – USA
Website:
Cutting heavy ID scarf
GEBRÜDER Lennartz GmbH & Co
KG, from Germany, is a specialist in
the manufacture and supply of carbide-
tipped circular saw blades for the
ferrous and non-ferrous industry. It has
now unveiled another new product from
its ECOmax family.
The ECOmax Scarf circular saw blade
is a new development and is customised
for cutting tubes and profiles with heavy
ID scarf on flying cut-off units.
Previously, conventional blades were
heavily damaged after only a few cuts
because they cut the high strength weld
bead inside of the bottom of the tube.
The service life of the blades was poor
and the cost per cut extremely high,
resulting in a cutting application that was
not always economical.
Because of its special tooth form and
cutting geometry – and in combination
with a new proprietary coating – the
ECOmax Scarf saw blade is suitable
for this difficult application. The new
design works successfully on single
head machines as well as on twin saws
with the simultaneous operation of two
saw blades to meet the customer’s
requirements and decrease the cost of
the cut. Successful trials and on-going
production usage, together with target
customers and machine manufacturers,
have shown the ECOmax blades achieve
up to 7m² of material removal on welded
tubes with wall thickness up to 14mm.
Gebr Lennartz GmbH & Co KG –
Germany
Website:
The Series 824 (and above)