Cycloidal deposition of sliver has proved to be the most advantageous method of filling a can (Fig. 75). In this process, two shifting movements of the deposition point are carried out simultaneously. The rotating plate R, with its guide passage L, draws the sliver away from the delivery cylinders D and continuously deposits it on a circle. However, since the turntable can plate C continually rotates the can, the deposition point of the circle is constantly shifting. A helical arrangement of the circles is produced within the can (Fig. 76).
In many coilers, the cans are no longer rotated. In this case, both movements must be induced from above. The delivery plate rotates at higher speed in a second larger plate, which is also rotating but at a lower speed. This also leads to shifting of the circles and hence to cycloidal deposition. In all cases, the sliver must be so deposited that a hollow space is created from top to bottom in the middle of the can. The space is required to ensure that the sliver layers do not overlap completely in the middle of the can. This avoids formation of a central pyramid-shaped column of material, leaving the side portions of the can half-empty.
Fig. 75 – Can filling device (coiler)
Fig. 76 – Laying down sliver in cans
