How Can the Oil Content in Rolling Oil Emulsions be Monitored

Relevant for steel industry, rolling of aluminum and copper

Rolling oil emulsions

Rolling oil emulsions are used in the cold rolling process of ferrous and non-ferrous metals. Rolling is a forming process, in which the rolled piece is deformed between two rollers. It is mostly used to reduce the thickness of a strip or sheet. The friction between the rollers and the material is a very important factor for the success of the rolling process. The generated heat must be transported away by the rolling oil emulsion. An important parameter in the rolling process is the oil content of the rolling oil emulsion.

The optimal oil content must be maintained, which is typically between 1.5% and 8%. The oil content directly relates to the sound velocity of the fluid. The measurement accuracy achieved is up to ±0.1%, depending on the oil type, the measurement range, the temperature and the contamination of the emulsion.

Inline sound velocity sensor L-Sonic 5100

Concentration measurement with a sound velocity sensor from Anton Paar makes a significant contribution to optimizing the rolling process. In detail, oil and energy consumption as well as the risk of slipping marks and sliding rollers are remarkably decreased.

A typical installation is in the supply pipe to the rolling mill. Highly accurate oil monitoring ensures increased rolling speed and reduced roller wear as well as lower oil and energy consumption.

Rolling processes are required for various metals, e.g. steel, aluminum and copper. Every metal is rolled best when the correct oil is used. Anton Paar provides various solutions for a wide range of oils in different solvents.


  • Continuous and accurate monitoring of oil content
  • Reduced oil and energy consumption
  • Reduced roller wear and risk of sliding rollers
  • Higher rolling speed

Learn more about the L-Sonic 5100/6100


L-Sonic 5100/6100


Measuring range: 800 to 2500 m/s
Sample temperature range: -25 to +125 °C
Ambient temperature range: -25 to +55 °C
Repeatability (one measuring value per second unfiltered): 0.005 m/s



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