Through the carding process, the washed, dried and oiled tufts of wool made of random and entangled fibres finally become a "card sliver" where fibres are straightened and aligned along the longitudinal axis of the sliver.
This operation is carried out with a "card", a machine which processes the fibres by means of a series of cylinders and rollers whose surface is covered with needles, i.e. the card clothing.
The interaction between the material and the needles of two opposite cylinders,
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