About cost saving solutions
The automatic thermal centering system is based on the principle that, by changing the temperature of the centering die surface during processing, the coefficient of friction between the melt and the metal die surface will be changed, thereby affecting the streaming properties. On the basis of this principle it is possible to influence the produced wall thickness at a given point on the circumference by varying the temperature of the die-head at that point or zone. The Rollepaal REX Control/PCS ll uses 8 separate die-head heating zones.
Our computer system is used to convert wall thickness data into setpoints for the high-precision temperature controllers linked to each of the 8 separate heating zones.
When the computer detects a variation in thickness at a particular part of the pipe circumference, it automatically adjusts the temperature setpoint for the individual heater at that point. This then affects the streaming properties of the centering die-head at that point, thereby correcting the wall thickness.
Automatic Thermal Control.
A set of sector heater bands mounted at the end of the die, controls the distribution of the wall thickness.
The ATC (Automatic Thermal Centering) can adjust:
- thin and thick sectors next to each other
- opposite thick sectors
- opposite thin sectors
contrary to a mechanical centering.
The two controls together - pipe speed and ATC - give a minimum pipe overweight combined with a guaranteed dimensional quality.
Small OD pipes have heater bands in 4 sectors instead of 8 or more.