Rieter

Double apron drafting system with long bottom apron

Index

In the double apron drafting system the fiber guidance unit consists of two aprons rotating with the middle rollers. The top apron must be pressed against the bottom apron with controlled force in order to provide guidance. For this purpose there must be a gap between the two aprons at the apron delivery end (tensor gap) that is precisely adjusted to the fiber volume. This gap can be adjusted by using different spacer plates, shoes, etc.

The top aprons, which are often plastic aprons, are always short. However, the bottom aprons can be as short as the top aprons (Fig. 16) or quite a bit longer and guided accordingly around deflecting elements (Fig. 15). The advantage of long bottom aprons over short aprons is that they are easy to replace in the event of damage. They are also less inclined to become clogged with fiber fly.

Fig. 15 – Long bottom apron

Fig. 16 – Short bottom apron