Simple Temperature Measurement Techniques for Extruders:
Jonathan Pangborn 1, Mark Rokos 2, Joan Mammen 2, Eskild Hoff 2, Richard Dickson 3,
Straightforward Solutions in a Tough Market
1 Hydro Aluminum Phoenix, Phoenix, Arizona, USA,
2 Hydro Aluminum Technology Center, Zeeland, Michigan, USA,
3 Hydro Aluminum Metal Markets North America
Track: EXTRUSION/DIE PRACTICAL - Best Practices
ABSTRACT—Process control in aluminum extrusion is, as in other processes, of great
importance to the quality of the final product. In extrusion, we know that temperature control
in all stages is ultra-critical, and thus needs to be measured and controlled. A lack of control
will result in recurrent poor quality, and a continuous struggle to meet the customers’
requirement. Most extruders realize this, and therefore strive to measure and control
temperature. Due to practical considerations in the production environment, there are no
doubt a multitude of methods for measuring in use in our industry, from in-house methods to
high-tech custom arrays marketed by industry suppliers. Many of these are subject to uncear
levels of variability and ‘art’ in application. Also, some inline measurement methods need to
be monitored and calibrated regularly to verify they are operating under the right conditions.
Through our experience at Hydro Aluminum, we have developed a number of simple yet
thoughtful methods for temperature measurement. The focus has been to compile
inexpensive scientifically-backed methods that can be implemented in-house by most
extruders, either for use in production measurements or for monitoring and calibration of
other inline temperature measurement systems. This paper will cover temperature control,
from casthouse homogenization through cooling after extrusion.
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