This stage is usually carried out by an opening willow in the case of shorter fibres and by a willow in the case of longer ones.
In the opening willow the fibres, evenly and constantly fed to the conveyor, are drawn inside the machine by two licker-in cylinders, which have grooved surfaces to help them to retain the material. From this cylinder nip area the fibrous mass is violently taken up by a drum that rotates rapidly in a clockwise direction. This drum is covered with wooden staves that
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