Defects And Their Possible Reason - HSK HSK23 Bedienungsanleitung

Bedienungs- und Wartungsanleitung für Handschweißextruder Serie HSK23/HSK30
After removal of the welding nozzle, the die and the aluminium base plate can be
cleaned from adherent material deposits.
To this purpose employ a soft wire brush, for example out of brass.
After remounting and alignment of the welding nozzle please retighten the
attachment screw (1) again, but only smoothly - just to keep the welding nozzle
stable. If screw is retightened too much, the die may be damaged. Once the system
has cooled down, it is well possible that the welding nozzle sticks quite loose in its
position. Discovering this, please do not tighten the attachment screw (1) because of
the said reasons. The attachment screw (1) must only be retightened once the
machine has been heated up again for further use.

9. Defects and their possible reason

Defects
Machine doesn't discharge uniformly (is pumping)
mainly occurs with PP
Melt is interspersed with bubbles
Machine does not reach sufficient speed
Machine does not run smoothly
No means to regulate melt temperature
Set-point air temperature for preheating is not
reached
 HSK Kunststoff Schweißtechnik GmbH
a): machine is overheated
b): screw must be cleaned
a): melt temperature is too high
b): welding wire is too old or too humid
a): melt temperature is too low
b): heater band defective
a): wear of carbon brushes
b): fluctuations on the power supply
regulator or thermocouple defective
a): cartridge heater defective
b): electronics defective
c): insufficient air quantity
Possible reasons
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