30 / 40
2
Coloured granules
provide the
colour of the tube. Transparent
coloured tubing is the most popular.
6
Pulling:
the tube travels along
the line at 30 m/min, according
to the size of the product. To retain
the correct structure of the tube, the
acceleration must be carefully monitored.
The drawing speed is controlled using
Festo components.
5
Forming:
the extruder head forms
the tube. It is formed to the required
dimensions in the vacuum chamber.
As the tube cannot solidify in one piece,
it is cooled gradually.
3
Drying:
90 per cent of the materials must be dried to
the required level before use. Depending on the dryer
volume and type of material, the amount to be produced
is determined very accurately so that it can be continuously
collected for processing.
4
Extrusion:
the dispenser mixes the dried material with
the pigment in a predefined ratio, or with a cross linking
agent in the case of polyethylene. The mixture is melted
in the extruder at 200-220 °C and homogenised.