Flat, oval or round bars are welded, riveted or screwed to closed cylinders. In another system flat bars are secured with the narrow side facing in the direction of rotation.
The rollers are therefore called spiked rollers (Fig. 16). Various spacings of the striker elements are used. These devices are incorporated mainly in modern horizontal cleaners, 
chute feeds, mixing bale openers, step cleaners, etc., which are located from the start to the middle of the blowroom line.
At the start of the line, the spacing of the striker elements on the roller is greater; finer spacings are used in the middle (to the end) of the line. The rollers rotate at speeds in the range of 600 - 1 000 rpm.
Fig. 16 – Spiked roller
