The washed, beaten and oiled wool is sent to special carding rooms through a pneumatic system.
It remains there for the time necessary to allow a proper distribution of the oiling substance into the fibres and also to meet the specific production schedule.
The efficiency of the carding operation strictly depends on the washing operation mode; in fact:

- a high moisture content of the material can generate undesired fibre winding on the clothing of the cylinders (“fibre bands”) with possible formation of hardly recoverable fibre entanglements (“neps”),
- an excessive residual quantity of grease dirties the clothing causing a consequent bad running,
- an excessive removal of grease increases the tendency of the fibres to take up static charges to such an extent that they cannot be neutralised completely by the anti-static agents added to the oiling substance.