Rieter

Creel (sliver feed)

Index

In particular, the creel must be designed so that:

  • false drafts are avoided;
  • the machine stops immediately when a sliver break occurs;
  • sliver breaks can be dealt with easily, comfortably and safely.

For this purpose, it is necessary to provide a positively driven roller or roller pair (Fig. 2, 2) above each can, one for each sliver. Driven rollers are essential in the case of insufficient fiber adherence, e.g. combed sliver. A guiding device for feeding the slivers into the drafting arrangement is also required. A table with rollers, or simply a line of rollers, can provide the required guidance. Rollers alone are preferred in rapidly operating high-draft drawframes, since friction is lower when transport is effected by means of rolling than when it relies upon sliding. The infeed roller pairs (2) also serve as electrical contact rollers, and for monitoring the sliver. If a sliver breaks, the metal rollers come into contact when the insulating sliver is no longer present between them, and the machine is stopped. Today all drawframes have in-line sliver feed (see Fig. 3), i.e. the feed cans are arranged in one or (mostly) two rows in the direction of movement into the machine. Rieter offers a two-row arrangement in “T” form, reducing space requirements in machine length.Normally, slivers may be fed in from up to eight cans per drawing head, and the cans may have diameters up to 1 000 mm (40 inches). It is important that the slivers lie closely adjacent, but not on top of one another, as they run into the drafting arrangement.

Fig. 3 – Different systems of sliver creels