MEK-40,65 / MAK-40,65
Issue 08.2008/Rev. 01
Page 9/20
For both types of hand extruder, the following pa-
rameters can be freely selected:
-
welding rate,
-
hot air temperature,
-
melt temperature and throughput; the melt
throughput can be controlled downward from the
maximum value,
firstly by using 4 mm instead of 5 mm welding
rod and, secondly, by reducing the speed using
the rotary button on the Powerbox or the fine-
tuning button of the drive.
CAUTION Too low a speed will cause a risk of drive
overheating!
Driven by a powerful electric motor (1), the welding rod (2)
is fed into the extruder (3) and granulated by the extruder
screw in the process. The screw forces the granulate into
the extruder nozzle, melting it into a homogeneous, com-
pletely plastified mass. As the molten material exits the
extruder nozzle, it is moulded by a welding shoe (4) to the
geometry of the weld seam to be deposited.
Preheating of the base material to be joined is accom-
plished by a preheating nozzle (5) which is supplied from
an integrated hot air unit (6). Air is supplied either from an
external compressor or an on-board blower.
Melt and preheat temperatures are controlled sepa-
rately. The setpoint and momentary values are dis-
played concurrently.
The melt temperature must have reached the preset
start interlock temperature for the startup timer to
be activated. After the startup timer has timed out,
the start interlock will be released and the extruder
can be started.
The temperature-controlled start interlock prevents
the drive from starting if there is still unmolten mate-
rial in the extruder, thus precluding damage to the
unit.
The output rate is variable so that the preheat tem-
perature can be matched to the weld thickness.
5 Startup and Shutoff
5.1 General
In addition to the operating instructions and the na-
tional and local accident prevention regulations ap-
plicable at the place of use, the acknowledged
technical rules for safe and proper working practices
must be observed.
Any working practices posing a safety risk are pro-
hibited.
Before starting / shutting off the hand extruder, make
sure to carefully read the instructions under section
“Safety”.
Only trained and qualified personnel may be as-
signed to the operation of the hand extruder.
5.2 Preparation
•
Place hand extruder and Powerbox on a firm
support and secure them against toppling over.
•
Mount hot air hood
•
Position handle
Loosen handle (55) and move it to the ideal work-
ing position by pushing it back and forth. The
handles of these extruder models can also be
swivelled upward and downward so that the ma-
chine can be operated by both right-handed and
left-handed persons.
•
Only for MEK hand extruder with external air
supply:
Connect the hand extruder to the external air
source using the hose coupling LW 13 / NM 7.2
provided for this purpose (quick connect-
disconnect); set air rate to 300 l/min at 0.4 bar. A
suitable controller with flow metering function is
recommended for setting the air rate.
CAUTION The supply air must be clean, dry and
free from oil and water.
Never connect an external air source to a
MAK hand extruder.