13 and of the feed roller 12 is called the contact pressure line in the direction of the fibre material feed a first opening and cleaning section 2 is situated behind the feed device 1 comprising an opener roller 21 rotatably mounted in the frame of the device and whose axis of rotation is parallel to the axis of rotation of the feed roller 12 the surface of the opener roller 21 is fitted with projections such as saw shaped teeth or needles in a particular embodiment the functional surface of the opener roller 21 is fitted with a well known saw shaped cover in the frame x under the lower section of the circumference of the opener roller 21 there are in a well known manner situated cleaning means 22 and 23 made in the example shown in fig2 as well known bouncing knives freely adhering to the articulated surface of the opener roller 21 and connected to a well known device for the removal of impurities separated from the fibres during the opening and cleaning process in another embodiment the cleaning means 22 and 23 are made as well known combing bars or as other cleaning means in the upper half of the opener roller 21 an upper cleaning means 24 adheres to its articulated surface also connected to the well known device for the removal of impurities and used for cleaning said surface of the opener roller.