A decrease in per-
formance can also
be related to the
occlusion of the nozzle or the suction channel: use
the metal brush with a tool stably above 240° C in
temperature, inserting it from the front of the nozzle
hole and pushing it gently and repeatedly towards
the bottom.
in order to recreate the correct circulation of the va-
cuum and remove any further residues.
It is not uncommon for the
nozzle itself to be exposed to
corrosion, abrasion or frag-
mentation due to subsequent
heating and cooling: this con-
dition can also lead to a decrease, even noticeable,
in performance, since the contact surface between
the tool and the pitch to be liquefied is reduced. Sin
-
ce this condition is extremely difficult to visually veri
-
fy, replace the nozzle on a recurring basis.
Nozzle assembly sequence: once replaced, reas-
