2
Colouredgranules
provide the
colour of the tube. Transparent
coloured tubing is themost popular.
6
Pulling:
the tube travelsalong
the lineat 30m/min, according
to thesizeof theproduct.To retain
the correct structureof the tube, the
accelerationmust becarefullymonitored.
Thedrawingspeed is controlledusing
Festo components.
5
Forming:
theextruder head forms
the tube. It is formed to the required
dimensions in thevacuum chamber.
As the tube cannot solidify inonepiece,
it is cooledgradually.
3
Drying:
90per cent of thematerialsmust bedried to
the required level beforeuse. Dependingon thedryer
volumeand typeofmaterial, theamount tobeproduced
isdeterminedveryaccuratelyso that it canbe continuously
collected for processing.
4
Extrusion:
thedispensermixes thedriedmaterialwith
thepigment inapredefined ratio, orwithacross-linking
agent in the caseof polyethylene. Themixture ismelted
in theextruder at 200-220 °Candhomogenised.
